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When another old cave is discovered in the south of France, it is not usually news. Rather, it is an ordinary event. Such discoveries are so frequent these days that hardly anybody pays heed to them. However, when the Lascaux cave complex was discovered in 1940, the world was amazed. Painted directly on its walls were hundreds of scenes showing how people lived thousands of years ago. The scenes show people hunting animals, such as bison or wild cats. Other images depict birds and, most noticeably, horses, which appear in more than 300 wall images, by far outnumbering all other animals.
Early artists drawing these animals accomplished a monumental and difficult task. “They” did not limit themselves to the easily accessible walls but carried their painting materials to spaces that required climbing steep walls or crawling into narrow passages in the Lascaux complex.
Unfortunately, the paintings have been exposed to the destructive action of water and temperature changes, which easily wear the images away. Because the Lascaux caves have many entrances, air movement has also damaged the images inside. Although they are not out in the open air, where natural light would have destroyed them long ago, many of the images have deteriorated and are barely recognizable. To prevent further damage, the site was closed to tourists in 1963, 23 years after it was discovered.
5.What does the passage say happened at the Lascaux caves in 1963?
Suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:
Báo saiGiải thích: Dựa vào nghĩa của câu chọn C
Tạm dịch:Đoạn văn chỉ ra điều gì đã xảy ra tại các hang động Lascaux vào năm 1963?
Câu hỏi liên quan
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Tides are the periodic rise and fall of the Earth’s waters that are caused by the Moon’s and Sun’s forces of gravity acting on the Earth .It is important to distinguish natural tidal phenomena from huge tsunamis , with the latter being caused by earthquakes and undersea volcanic eruptions.
The Moon is a main factor controlling ordinary tides. At the location on the Earth closest to the Moon, it exerts a powerful gravitational pull on the water. The resulting rise in the water produces higher tides. The water on the side of the Earth farthest away from the Moon also gets pulled by this lunar gravity, but not as strongly. The Earth itself has its own gravitational force that is constantly pulling waters downward, which is why the oceans do not simply bulge out toward the Moon. Ordinary tides usually feature high and low waters alternating in relation to the Earth’s rotation. Most shores around the world have high waters and two low waters for each day, which last about 24 hours and 50 minutes. The difference in height between the high water and low water is called the range of tide, and it can be quite dramatic in narrower bays
.Canada’s bays of Fundy , for example , commonly experiences the world’s most extreme tidal ranges , with daily differences of the 16 meters.
Two other types of tides are influenced by the Sun, which is much farther away from the Earth and exerts less than half of the Moon’s gravitational force. When the Sun, the Moon and the Earth are directly in line, the solar and lunar gravitational forces add up to produce higher spring tides. The range of spring tides is intensified, with higher water marks and lower low water marks. However, when the Moon is in the first or third quarter, it is at a 90–degree angle with the Sun in relation to the Earth .The opposing solar and lunar forces partially cancel each other out, and the result is a lower tide. This is called a neap tide, which comes twice a month and has lower high water marks and higher low water marks. The range of neap tides is minimum.
Some tides do not occur over water at all. The solid body of the Earth has slight elasticity, so lunar and solar gravity cause it to stretch very subtly. These changes in the Earth’s shape, although imperceptible to humans, are known as Earth tides.
Another tidal phenomenon, atmospheric tides, is caused by the Sun’s heating of the Earth’s atmosphere. Like ordinary tides, they usually occur over 12–hour periods.What can be inferred about Canada’s Bay of Fundy ?
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Choose the item among A, B, c or D that best answers the question about the passage:
"Computer programmer David Jones earns £35,000 a year designing new Computer games, yet he cannot find a bank prepared to let him have a cheque car. Instead he has been told to wait another two years, until he is 18.
The 16-year-old boy works for a small firm in Liverpool, where the problem of most young people of age is finding a job. David’s firm releases two new games for the expanding home Computer market each month.
But David’s biggest headache is what to do with his money. Despite his salary, earned by inventing new programmes within tight schedules with bonus payment and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.
David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a Computer shop. “I got the job because the people who run the firm knew I had already written some programmes,” he said.
I suppose £35,000 sounds a lot but actually that’s being pessimistic. I hope it will come to records and clothes and he gives his mother £20 a week. But most of his spare time is spent working. “Unfortunately, computing was not part of our studies at school,” he said. “But I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school. Most people in this business are fairly young anyway.”
David added, “I would like to earn a million and I suppose early retirement is a possibility. You never knew when the market might disappear.”"He left school after O-levels because ……
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Today, there are 600 million cars in the world. They may seem like a lot. However, there are over 7 million people on our planet. Most of the world’s population uses public transportation to get around. The number of people using public transportation continues to rise. Subway systems worldwide carry 155 million passengers each day. That’s more than 30 times the number carried by all the world’s airplanes. Every day in Tokyo passengers take more than 40 million rides on public transportation.
Yet many people see public transportation as ‘a depressing experience’, says author Taras Gresco. They say it is slow, crowded, or too expensive. In fact, Gresco says, it is actually ‘faster, more comfortable and cheaper’ than driving a car.Like millions of people, Taras Gresco is a ‘straphanger’ - a person who rides public transportation. In his book straphanger: Saving Our Cities and Ourselves from the Automobile, Gresco describe the benefits of public transportation. Firstly, it is better for the environment. When people use public transportation, they use less fuel. Twenty people on one bus use much less fuel than 20 people in 20 cars. Fewer cars mean less pollution and cleaner air.
Using public transportation can be good for your health in other ways. It can even help you lose weight. In one study, a group of people took public transportation every day for six months. Each day they walked to a bus stop or train station. In six months, each person lost an average of six pounds - almost three kilograms. Taking public transportation has another benefit, says Gresco. It helps people become part of their community. When you are alone in your car, you don’t talk to anyone. One Tokyo straphanger told Gresco, “To use public transport is to know how to cooperate with other people,’ It teaches you ‘how to behave in a public space’. So, public transportation is more than a way to get to work or school. It can help lead to cleaner cities. It may also lead to a healthier and more cooperative world population.How does the environment benefit from people’s use of the public transportation ?
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Optimists have plenty to be happy about. In other words, if you can convince yourself that things will get better, the odds of it happening will improve - because you keep on playing the game. In this light, optimism “is a habitual way of explaining your setbacks to yourself”, reports Martin Seligman, the psychology professor and author of Learned Optimism. The research shows that when times get tough, optimists do better than pessimists - they succeed better at work, respond better to stress, suffer fewer depressive episodes, and achieve more personal goals.
Studies also show that belief can help with the financial pinch. Chad Wallens, a social forecaster at the Henley Centre who surveyed middle-class Britons’ beliefs about income, has found that “the people who feel wealthiest, and those who feel poorest, actually have almost the same amount of money at their disposal. Their attitudes and behaviour patterns, however, are different from one another.”
Optimists have something else to be cheerful about - in general, they are more robust. For example, a study of 660 volunteers by the Yale University psychologist Dr. Becca Levy found that thinking positively adds an average of seven years to your life. Other American research claims to have identified a physical mechanism behind this. A Harvard Medical School study of 670 men found that the optimists have significantly better lung function. The lead author, Dr. Rosalind Wright, believes that attitude somehow strengthens the immune system. “Preliminary studies on heart patients suggest that, by changing a per¬son’s outlook, you can improve their mortality risk,” she says.
Few studies have tried to ascertain the proportion of optimists in the world. But a 1995 nationwide survey conducted by the American magazine Adweek found that about half the population counted themselves as optimists, with women slightly more apt than men (53 per cent versus 48 per cent) to see the sunny side.Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Optimists have plenty to be happy about. In other words, if you can convince yourself that things will get better, the odds of it happening will improve - because you keep on playing the game. In this light, optimism “is a habitual way of explaining your setbacks to yourself”, reports Martin Seligman, the psychology professor and author of Learned Optimism. The research shows that when times get tough, optimists do better than pessimists - they succeed better at work, respond better to stress, suffer fewer depressive episodes, and achieve more personal goals.
Studies also show that belief can help with the financial pinch. Chad Wallens, a social forecaster at the Henley Centre who surveyed middle-class Britons’ beliefs about income, has found that “the people who feel wealthiest, and those who feel poorest, actually have almost the same amount of money at their disposal. Their attitudes and behaviour patterns, however, are different from one another.”
Optimists have something else to be cheerful about - in general, they are more robust. For example, a study of 660 volunteers by the Yale University psychologist Dr. Becca Levy found that thinking positively adds an average of seven years to your life. Other American research claims to have identified a physical mechanism behind this. A Harvard Medical School study of 670 men found that the optimists have significantly better lung function. The lead author, Dr. Rosalind Wright, believes that attitude somehow strengthens the immune system. “Preliminary studies on heart patient -
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Around the year 1500, hunting people occupied the entire northern third of North America. They lived well from the animals with which they shared these lands. Hunters of sea mammals had colonized the Arctic coasts of Canada and Greenland between four and five thousand years before. Land-hunting people had lived throughout much of the northern interior for at least 12,000 years.
Northern North America is part of a larger circumpolar ecological domain that continues across the narrow Bering Strait into Siberia and northern Europe. The overall circumpolar environment in the 1500's was not very different from the environment of the present. This vast landmass had a continental climate and was dominated by cold arctic air throughout a long winter and spring season. Summer temperature ranged from near freezing to the mid-20's Celsius, while winter temperature were often as low as 40 degrees below zero Celsius.
Geographers divide the overall circumpolar domain into two zones, the Arctic and, below it, the Subarctic. They refer to the landforms of these areas as tundra and taiga, respectively.
Temperatures in the northern lands were below freezing for eight or nine months of the year. Subsurface soil in the Arctic's tundra remained permanently frozen. Even when summer temperatures were above freezing and the top inches of earth became saturated with water, the soil below remained frozen into a permafrost, as hard as rock. When water flowed upon the surface of permanently frozen tundra, it made overland travel extremely difficult. Summer travel in the boggy lands, or muskeg country, of the Sub Arctic’s taiga was also slow and arduous. Tracking animals was more difficult than it was during the winter when the swampy ground was frozen solid and covered with snow. In both tundra and taiga, hordes of mosquitoes and biting flies bred in the standing pools of water. Clothing lost its thermal efficiency when it became damp. Northern people looked forward to the turn of the season to bring the easier traveling conditions associated with cold weather. In the Arctic, they could haul food and supplies by dogsled while in the Subarctic; people could travel quickly and efficiently by snowshoes and toboggan.What does the passage mainly discuss?
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Around the year 1500, hunting people occupied the entire northern third of North America. They lived well from the animals with which they shared these lands. Hunters of sea mammals had colonized the Arctic coasts of Canada and Greenland between four and five thousand years before. Land-hunting people had lived throughout much of the northern interior for at least 12,000 years.
Northern North America is part of a larger circumpolar ecological domain that continues across the narrow Bering Strait into Siberia and northern Europe. The overall circumpolar environment in the 1500's was not very different from the environment of the present. This vast landmass had a continental climate and was dominated by cold arctic air throughout a long winter and spring season. Summer temperature ranged from near freezing to the mid-20's Celsius, while winter temperature were often as low as 40 degrees below zero Celsius.
Geographers divide the overall circumpolar domain into two zones, the Arctic and, below it, the Subarctic. They refer to the landforms of these areas as tundra and taiga, respectively.
Temperatures in the northern lands were below freezing for eight or nine months of the year. Subsurface soil in the Arctic's tundra remained permanently frozen. Even when summer temperatures were above freezing and the top inches of earth became saturated with water, the soil below remained frozen into a permafrost, as hard as rock. When water flowed upon the surface of permanently frozen tundra, it made overland travel extremely difficult. Summer travel in the boggy lands, or muskeg country, of the Sub Arctic’s taiga was also slow and arduous. Tracking animals was more difficult than it was during the winter when the swampy ground was frozen solid and covered with snow. In both tundra and taiga, hordes of mosquitoes and biting flies bred in the standing pools of water. Clothing lost its thermal efficiency when it became damp. Northern people looked forward to the turn of the season to bring the easier traveling conditions associated with cold weather. In the Arctic, they could haul food and supplies by dogsled while in the Subarctic; people could travel quickly and efficiently by snowshoes and toboggan.The word “standing” in line 25 is closest in meaning to
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By mid-century, there will likely be 9 billion people on the planet, consuming ever more resources and leading ever more technologically complex lives. What will our cities be like? How much will artificial intelligence advance? Will global warming trigger catastrophic changes, or will we be able to engineer our way out of the climate change crisis?
Making predictions is, by nature, a dicey business, but to celebrate the 40th anniversary of Smithsonian magazine Big Think asked top minds from a variety of fields to weigh in on what the future holds 40 years from now. The result is our latest special series, Life in 20 50. Demographic changes in world population and population growth will certainly be dramatic. Rockefeller University mathematical biologist Joel Cohen says it's likely that by 2050 the majority of the people in the world will live in urban areas, and will have a significantly higher average age than people today. Cities theorist Richard Florida thinks urbanization trends will reinvent the education system of the United States, making our economy less real estate driven and erasing the divisions between home and work.
Large migrations from developing countries like Indonesia, Malaysia, Bangladesh, Mexico, and countries in the Middle East could disrupt western governments and harm the unity of France, Germany, Spain, the Netherlands, Poland, and the United Kingdom under the umbrella of the European Union.
And rapidly advancing technology will continue ever more rapidly. According to Bill Mitchell, the late director of MIT's Smart Cities research group, cities of the future won't look like "some sort of science -fiction fantasy" or "Star Trek" but it's likely that "discreet, unobtrusive" technological advances and information overlays, i.e. virtual reality and augmented reality, will change how we live in significant ways. Self-driving cars will make the roads safer, driving more efficient, and provide faster transports. A larger version of driverless cars-driverless trucks-may make long haul drivers obsolete.
Meanwhile, the Internet will continue to radically transform media, destroying the traditional model of what a news organization is, says author and former New York Times Public Editor, Daniel Okrent, who believes the most common kinds of news organizations in the future will be "individuals and small alliances of individuals” reporting and publishing on niche topics.Which of the following best describes the author’s attitude about the life in 2050?
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Since the first Paralympic Games in Rome in 1960, swimming has been one of its main sports.
The thrill of competition aside, swimming offers many benefits including strengthening the cardiovascular systems and the major muscle groups of both the upper and lower body. It also develops flexibility in the muscles and joints as the swimmer performs a wide range of motion against the water's resistance. It is an activity that keeps your heart rate up but takes some of the stress that is common in impact sports off the body; injuries don't occur as easily. The water's buoyancy evenly distributes and supports the weight of the body; there is no danger of falling, and there are no impact forces on the residual limb. Swimmers who have disabilities endorse the sport because it gives them a sense of freedom. They don't have to rely on any supportive device, such as a wheelchair, to assist them. They are independent. They are only judged on their times and whether those times are dropping. “Water is one of the big equalizers,” said Queenie Nichols, long-time Paralympic swim coach. "One of the phrases I heard since I got involved in this is that we are all equal in the water and that is really true. Athletes with disabilities, from below-knee amputations to severe quads, can compete and compete successfully.”
While it is not essential to begin swimming at an early age to become an elite athlete, Nichols believes that the sooner an individual becomes comfortable in the water, the better. "I think starting at about 5 years old is a good age to get children involved, in the pool at least once a week. Keep it fun for them until they show an interest in growing with a Club," she said.
“Most clubs that belong to USA Swimming or YMCAs offer coaching and training at the appropriate level for age and experience,” Nichols said. "We suggest aspiring athletes participate with an able-bodied club at first because of the greater number of individuals they will compete with."
Typically, swimmers in this introductory/ foundation phase, usually aged 5 to 8 or 9, remain there for about 5 years before transitioning to the next level, which includes more advanced drills and stroke efficiency. Athletes with disabilities who join swimming clubs benefit from better sport-specific coaching, more rigorous training, more competition in practice, and higher expectations than they are likely to receive in other settings. Other benefits include socialization opportunities, greater independence in activities of daily living, and improved ability to cope with limitations imposed by disabilities.As mentioned in paragraph 4, Athletes with disabilities who join swimming clubs can benefit .
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Choose the best answer:
The expression on your face can actually dramatically alter your feelings and perceptions, and it has been proved that (1) ____ smiling or frowning can create corresponding emotional responses. The idea was first (2) _______ by a French physiologist, Israel Waynbaum, in 1906. He believed that different facial (3) _______ affected the flow of blood to the brain, and that this could create positive or negative feelings. A happy smile or irrepressible laughter increased the blood flow and contributed to joyful feelings. But sad, angry expressions decreased the flow of oxygen- carrying blood, and created a vicious (4) _______ of gloom and depression by effectively (5) _______ the brain of essential fuel.Psychologist Robert Zajonc rediscovered this early research, and (6) ____ that the temperature of the brain could affect the production and synthesis of neurotransmitters which definitely influence our moods and energy levels. He argues that an impaired blood flow could not only deprive the brain of oxygen, but create further chemical imbalance by inhibiting these vital hormonal messages. Zajonc goes on to propose that our brains remember that smiling is associated with being happy, and that by deliberately smiling through your tears you can (7) ____ your brain to release uplifting neurotransmitters – replacing a depressed condition with a happier one. People suffering from psychosomatic illness depression and anxiety states could (8) _____ from simply exercising their zygomatic (9) ____ which pull the corners of the mouth (10) ____ to form a smile, several times an hour.
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For Nigel Portman, a love of travelling began with what’s called a ‘gap year’. In common with many other British teenagers, he chose to take a year out before (1)................. to study for his degree. After doing various jobs to raise some money, he left home to gain some experience of life in different cultures, visiting America and Asia. The more adventurous the young person, the (2)................. the challenge they are likely to set themselves for the gap year, and for some, like Nigel, it can result in a thirst for adventure. Now that his university course has (3)................. to an end, Nigel is just about to leave on a three-year trip that will take him all around the world. What’s more, he plans to make the whole journey using only means of transport which are powered by natural energy. In other words, he’ll be (4)................. mostly on bicycles and his own legs; and when there’s an ocean to cross, he won’t be taking a short cut by climbing aboard a plane, he’ll be joining the crew of a sailing ship instead. As well as doing some mountain climbing and other outdoor pursuits along the way, Nigel hopes to (5)................. on to the people he meets the environmental message that lies behind the whole idea.In common with many other British teenagers, he chose to take a year out before (1)................. to study for his degree
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
The string family is the largest section of the orchestra. The four main stringed instruments look similar but are all different sizes. Each can be played by plucking the strings with the fingers or with a bow, which is pulled (1) _______ across the instrument's four strings.
The VIOLIN is the smallest of the string instruments and can play the highest (2) ________. The violin often plays the melody - this is the tune you will be humming after you leave a performance. The VIOLA is slightly larger than the violin. Because it is bigger, it can play lower notes. (3) _______ the viola is only a little bit bigger than the violin, it can be hard to tell them apart. The viola plays many beautiful melodies just like the violin.
The CELLO is (4) ________ the violin and the viola. It is so large that the cellist must sit on a chair holding the cello between his or her knees in order to play. The cello often plays accompaniment parts.
Because it is the largest of the stringed instruments, the DOUBLE BASS plays the lowest notes. This instrument is so large that the bass players have to stand up or sit on tall stools to play it. The bass often plays (5) ________ parts with the cello.(3).................
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Mark Zuckerberg was born in 1984, in New York, into a prosperous, professional family. He developed an interest in computers at an early age and when he was twelve, he created a messaging program which he named "Zucknet". His dentist father used it in his surgery so that his receptionist could inform him of the arrival of a patient without yelling across the room. Together with his friends, Mark spent much of his spare time as a boy designing and making computer games just for fun.
In 2002, Mark enrolled at Harvard University. By his second year at the institution, he had acquired a reputation on the campus as a developer of software. It was at that time he invented "Facemash" which compared pictures of female students and allowed users to vote on which one was the most attractive. The program became very popular on campus, but was later shut down by the university authorities who deemed it 'inappropriate'.
Based on the buzz of "Facemash", three of Mark's fellow students, Divya Narendra, and twins, Cameron and Tyler Winklevoss, asked him to work with them on an idea for a social networking site called "Harvard Connection". This site was designed to use information from Harvard's student networks to create a dating site for the university's elite. Mark was initially enthusiastic about the complex project but boredom soon set in
and he backed out of it to work on his own social networking site. He created a site that allowed users to produce their own profiles, upload photos, and communicate with other people beyond the confines of the university. He called the site "Facebook" and he operated from one small college room until June 2004 when he finally abandoned his studies to devote himself fully to Facebook and moved the company to California. By the end of 2004, Facebook had one million users and Mark was climbing high.Which of the following best serves as the title for the passage?
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Atomic were once thought to be fundamental pieces of matter, but they are in turn made of smaller subatomic particles There are three major subatomic particles neutrons, protons, and electronic. Protons and neutrons can be broken into even smaller units, but these smaller units not occur naturally in nature and are thought to only be produced in manmade particle accelerators and perhaps in extreme stellar events like supernovas. The structure of an atom can best be described as a small solar system, with the neutrons at the center and the electrons circling them in various orbits, just as the planets circle the sun. In reality, the structure of an atom is far more complex, because the laws of physics are fundamentally different at the atomic level than at the level of the observable word. The true nature of atomic structure can only be expressed accurately through complex mathematical formulas. This explanation, however, is of little use to most average people.
Protons and neutrons have nearly equal mass and size, but protons carry a positive electrical charge, while neutrons carry no charge at all. Protons and neutrons are bound together by the strong nuclear force, one of the four basic forces in the universe. Protons and neutrons give atoms some of their most basic properties. Elements are defined by two numbers: their atomic number, which is equal to the number of protons they have, and their atomic weight, which is equal to total number of their neutrons and protons. In most lighter atoms, the number of neutrons and protons is equal, and the element is stable. In heavier atoms, however, there are more neutrons than protons, and the element is unstable, eventually losing neutrons through radioactive decay until a neutral state is reached.
Electrons are negatively charged particles. They are bound to their atoms through electromagnetic attraction. Opposite electrical charges attract one another, so the positive charge of the proton helps to keep the negatively charged electron in orbit around the nucleus of the atom. Electrons are different from neutrons in that they cannot be broken down into smaller particles. They are also far smaller and lighter than neutrons and protons. An electron is about one thousandth of the diameter of a proton and an even smaller fraction of its mass. Electrons circle the protons and neutrons at the center of the atom in orbits. These orbits are often called electron shells. The closer the orbit is to the center of the atom, the lower its energy is. There are seven electron shells, and each higher level can hold more electrons than the previous shell. Electrons naturally seek to occupy the lowest shell possible. So, if there is space in a lower shell, an electron will drop down to occupy that space. At temperatures higher than a few hundred degrees, electrons will gain energy and move to a higher shell, but only momentarily. When the electrons drop back down to their natural shell, they emit light. This is why fires and other very hot objects seem to glow.
Electrons are also primarily responsible for many of the chemical properties of atoms. Since electrons seek to occupy the lowest electron shell possible, they will move from one atom to another if there is a space available in a lower electron shell. For example, if there is an atom with an open space in its third shell, and it comes into contact with an atom with electrons in its fourth shell, the first atom will take one of these electrons to complete its third shell. When this happens, the two atoms will be chemically bonded to form a molecule. Furthermore, atoms sometimes lose electrons in collisions with other atoms. When this happens, the radio of protons and electrons in the atom changes, and therefore, the overall electrical charge of the atom changes as well. These atoms -
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Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic flash can therefore be used to capture high- speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense flash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”
The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen difluoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reflecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.Which of the following is TRUE about the function of the glass in the first flashbulbs?
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
The tradition of gift giving is a worldwide (1)_________ that is said to have been around since the beginning of human beings. Over time, different cultures have developed their own gift giving customs and traditions.
In France, the gift of wine for the hostess of a dinner party is not an appropriate gift as the hostess would prefer to choose the vintage for the night. In Sweden, a bottle of wine or flowers are an appropriate gift for the hostess. In Viet Nam, a gift of whisky is appropriate for the host, and some fruit or small gifts for the hostess, children or elders of the home. Besides, gifts should never be wrapped in black paper because this color is unlucky and associated with funerals in this country. Gifts (2)____________symbolize cutting such as scissors, knives and other sharp objects should be avoided because they mean the cutting of the relationship. Also, in some countries you should not open the gift in front of the giver and in (3)__________ it would be an insult if you did not open the gift.
Beyond the gift itself, give careful consideration to the manner in which it is presented. Different cultures have different customs regarding how a gift should be offered - using only your right hand or using both hands, (4)_____. Others have strong traditions related to the appropriate way to accept a gift. In Singapore, for instance, it is the standard to graciously refuse a gift several times before finally accepting it. The recipient would never unwrap a gift in front of the giver for fear of appearing greedy.
Understanding these traditions and customs, as well as taking time to choose an appropriate gift, will help you to avoid any awkwardness or (5)__________ as you seek to build a better cross-cultural relationship.(3)....................
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If you go back far enough, everything lived in the sea. At various points in evolutionary history, enterprising individuals within many different animal groups moved out onto the land, sometimes even to the most parched deserts, taking their own private seawater with them in blood and cellular fluids. In addition to the reptiles, birds, mammals and insects which we see all around us, other groups that have succeeded out of water include scorpions, snails, crustaceans such as woodlice and land crabs, millipedes and centipedes, spiders and various worms. And we mustn't forget the plants, without whose prior invasion of the land, none of the other migrations could have happened.
Moving from water to land involved a major redesign of every aspect of life, including breathing and reproduction. Nevertheless, a good number of thoroughgoing land animals later turned around, abandoned their hard-earned terrestrial re-tooling, and returned to the water again. Seals have only gone part way back. They show us what the intermediates might have been like, on the way to extreme cases such as whales and dugongs. Whales [including the small whales we call dolphins] and dugongs, with their close cousins, the manatees, ceased to be land creatures altogether and reverted to the full marine habits of their remote ancestors. They don't even come ashore to breed. They do, however, still breathe air, having never developed anything equivalent to the gills of their earlier marine incarnation. Turtles went back to the sea a very long time ago and, like all vertebrate returnees to the water, they breathe air. However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.
There is evidence that all modern turtles are descended from a terrestrial ancestor which lived before most of the dinosaurs. There are two key fossils called Proganochelys quenstedti and Palaeochersis talampayensis dating from early dinosaur times, which appear to be close to the ancestry of all modern turtles and tortoise. You might wonder how we can tell whether fossil animals lived in land or in water, especially if only fragments are found. Sometimes it's obvious. lchthyosaurs were reptilian contemporaries of the dinosaurs, with fins and streamlined bodies. The fossils look like dolphins and they surely lived like dolphins, in the water. With turtles it is a little less obvious. One way to tell is by measuring the bones of their forelimbsIt can be inferred from the last passage that
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
In the early 1800s, less than 3% of the world's population lived in cities; today, more than half of the global population is urban and by 2050, the proportion will rise to three quarters. There are thousands of small and medium-sized cities along with more than 30 megacities and sprawling, networked metropolitan areas with 15 million residents or more. Yet despite these massive transformations in how people live and interact, our international affairs are still largely dictated by national states, not cities.
Cities are beginning to flex their muscles on the international stage. They are already displacing nation states as the central nodes of the global economy, generating close to 80% of global GDP. Cities like New York and Tokyo are bigger in GDP terms than many G-20 countries. Metropolitan regions and special economic zones are linking global cities through transnational supply chains. A growing number of mega-regions, such as those linking cities in Mexico and the U.S., transcend borders. In the process, cities are collectively forging common regional plans, trading partnerships, and infrastructure corridors.
The spectacular rise of cities did not happen by accident. Cities channel creativity, connect human capital, and when well governed, they drive growth. That many cities and their residents are rolling up their sleeves and getting things done - where nations have failed - are grounds for optimism. In the future, we hope that it is our proximate, accountable, and empowered city leaders who will define our fates.The word "they” in paragraph 4 refers to ____.
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Choose the item among A, B, c or D that best answers the question about the passage:
"Computer programmer David Jones earns £35,000 a year designing new Computer games, yet he cannot find a bank prepared to let him have a cheque car. Instead he has been told to wait another two years, until he is 18.
The 16-year-old boy works for a small firm in Liverpool, where the problem of most young people of age is finding a job. David’s firm releases two new games for the expanding home Computer market each month.
But David’s biggest headache is what to do with his money. Despite his salary, earned by inventing new programmes within tight schedules with bonus payment and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.
David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a Computer shop. “I got the job because the people who run the firm knew I had already written some programmes,” he said.
I suppose £35,000 sounds a lot but actually that’s being pessimistic. I hope it will come to records and clothes and he gives his mother £20 a week. But most of his spare time is spent working. “Unfortunately, computing was not part of our studies at school,” he said. “But I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school. Most people in this business are fairly young anyway.”
David added, “I would like to earn a million and I suppose early retirement is a possibility. You never knew when the market might disappear.”"2. David’s greatest problem is ……
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The quest for sustainable sources of energy study the energy has led humans to study the energy potential of the sun and the wind, as well as the immense power created by dammed rivers. The oceans, too, represent an impressive source of potential energy. For example, it has been estimated that the oceans could provide nearly 3,000 times the energy generated by hydroelectric dams such as the Hoover Dam. Yet, this source remains quite difficult to exploit.
But this challenge has not prevented scientists from trying. Within the last few decades, several technologies that can transform the ocean’s immense forces into usable electricity have been invented and introduced. Some focus on capturing the power of the changing tides, while others rely on thermal energy created by oceans in certain tropical regions. However, the most common and easiest-to-develop technologies are those designed to harness the power inherent in the ocean’s waves.
There are several methods by which ocean-wave energy can be collected. All of them work because the movement of the water that the waves induce creates storable energy by directly or indirectly driving a power generator. In one such technology, the changing water levels in the ocean that are produced by waves lift a long floating tube comprised of many sections connected by hinges. As the sections move up and down with the water, they pump a special fluid through the tube that can be used to drive a generator. Another technique works on a similar principle, only the floating object rocks back and forth with the motion of the water instead of up and down. A third method of collecting wave energy relies on the rising water from the waves to compress air in a partially submerged chamber. As the waves rush into the chamber, they push the air out through a narrow tunnel. Located inside this tunnel is a turbine connected to a power generator. The movement of the air turns the turbine, which feeds energy into the generator.
The drawback to each of these concepts is that the they make it necessary to have many pieces of machinery linked together. This presents a problem because the larger the device, the more vulnerable it is to damage from hazardous ocean environments, and the more likely it is to interfere with otherwise unspoiled coastal scenery. Also, these methods demand the construction of site-specific machines that take into consideration average local wave heights and sea conditions. Such a requirement can be quite cost-prohibitive, because engineers must create unique power generation mechanism for each site. In other words, the ability to get power from waves differ from region to region.
Japan, Norway, and the UK have attempted to generate energy by capturing the power of ocean waves. In northern Scotland, the first power plan to use wave power, OSPREY ( Ocean Swell Powered Renewable Energy ), began operating in 1995. It followed the principle of the third method described above : waves entering a partially submerged chamber pushed air into turbines to generate electricity. The electricity was then transmitted to power collectors in the shore via underwater cables. Unfortunately, the OSPREY plant was destroyed in a large storm, highlighting an unavoidable difficulty associated with this kind of power generation.
The potential benefits of wave-based energy are hard to ignore. Once the proper machinery is produced and installed, the energy is free. Maintenance cost are small, and the equipment does not pose any threats of environmental pollution. And best of all, the amounts of energy produced are enormous.
However, these theoretical advantages have yet to be fully realized. In many cases, a lack of government funding has inhibited the technologies from advancing. For example, despite the relative abundance of propo -
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Earth is richly supplied with different types of living organisms which co-exist in their environments, forming complex, interrelated communities. Living organisms depend on one another for nutrients, shelter, and other benefits. The extinction of one species can set off a chain reaction that affects many other species, particularly if the loss occurs near the bottom of the food chain. For example, the extinction of a particular insect or plant might seem inconsequential. However, there may be fish or small animals that depend on that resource for foodstuffs. The loss can threaten the survival of these creatures and larger predators that prey upon them. Extinction can have a ripple effect that spreads throughout nature.
In addition to its biological consequences, extinction poses a moral dilemma for humans, the only species capable of saving the others. The presence of humans on the planet has affected all other life forms, particularly plants and animals. Human lifestyles have proven to be incompatible with the survival of some other species. Purposeful efforts have been made to eliminate animals that prey on people, livestock, crops, or pose any threat to human livelihoods. Some wild animals have been decimated by human desire for meat, hides, fur, or other body parts with commercial value. Likewise, demand for land, water, and other natural resources has left many wild plants and animals with little to no suitable habitat. Humans have also affected nature by introducing non-native species to local areas and producing pollutants having a negative impact on the environment. The combination of these human-related effects and natural obstacles such as disease or low birthrates has proven to be too much for some species to overcome. They have no chance of survival without human help.
As a result, societies have difficult choices to make about the amount of effort and money they are willing to spend to save imperiled species. Will people accept limits on their property rights, recreational activities, and means of livelihood to save a plant or an animal? Should saving such popular species as whales and dolphins take priority over saving obscure, annoying, or fearful species? Is it the responsibility of humans to save every kind of life form from disappearing, or is extinction an inevitable part of nature, in which the strong survive and the weak perish? These are some difficult questions that people face as they ponder the fate of other species living on this planet.
The word "They" in paragraph 2 refers to ______.