Choose the sentence A, B, C or D which in closest in meaning to the printed sentence.
He did not work hard. He failed the exam.

 

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Although only a small percentage of the electromagnetic radiation that is emitted by the Sun is ultraviolet (UV) radiation, the amount that is emitted would be enough to cause severe damage to most forms of life on Earth were it all to reach the surface of the Earth. Fortunately, all of the Sun’s ultraviolet radiation does not reach the Earth because of a layer of oxygen, called the ozone layer encircling the Earth in the stratosphere at an altitude of about 15 miles above the Earth. The ozone layer absorbs much of the Sun’s ultraviolet radiation and prevents it from reaching the Earth. Ozone is a form of oxygen in which each molecule consists of three atoms (O3) instead of the two atoms (O2) usually found in an oxygen molecule. Ozone forms in the stratosphere in a process that is initiated by ultraviolet radiation from the Sun. UV radiation from the Sun splits oxygen molecules with two atoms into free oxygen atoms, and each of these unattached oxygen atoms then joins up with an oxygen molecule to form ozone. UV radiation is also capable of splitting up ozone molecules; thus, ozone is constantly forming, splitting, and reforming in the stratosphere. When UV radiation is absorbed during the process of ozone formation and reformation, it is unable to reach Earth and cause damage there. Recently, however, the ozone layer over parts of the Earth has been diminishing. Chief among the culprits in the case of the disappearing ozone, those that are really responsible, are the chlorofluorocarbons (CFCs). CFCs meander up from Earth into the stratosphere, where they break down and release chlorine. The released chlorine reacts with ozone in the stratosphere to form chlorine monoxide (ClO) and oxygen (O2). The chlorine then becomes free to go through the cycle over and over again. One chlorine atom can, in fact, destroy hundreds of thousands of ozone molecules in this repetitious cycle, and the effects of this destructive process are now becoming evident.
6. Ultraviolet radiation causes oxygen molecules to: 

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Not everybody recognizes the benefits of new developments in communications technology. Indeed, some people fear that text messaging may actually be having a negative (1)_____ on young people's communication and language skills, especially when we hear that primary school children may be at (2)______ of becoming addicted to the habit. So widespread has texting become, however, that even pigeons have started doing it. What’s more, in this case, it's difficult to view the results as anything but positive.
Twenty of the birds are about to (3) ______ to the skies with the task of measuring air pollution, each (4) _____ with sensor equipment and a mobile phone. The (5) _____ made by the sensors will be automatically (6) _____ into text messages and beamed to the Internet - where they will appear on a dedicated 'pigeon blog'

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Durable Ceramic Beauty
Inside an art and craft workshop, a young woman sits in front of a pottery wheel. The machine contains a large lump of clay which she molds into the shape of an elaborate bowl. Later, when she is satisfied with its appearance, it will be baked in an oven until it solidifies. Then she adds decorative paints to add some style. In the end, this ceramic pot will be both a handy utility for eating as well as a work of art. Humans have been working with ceramics for about 30,000 years, making it one of the oldest industries on the planet. In ancient times, ceramics enabled humans to make containers to store food and drinks, as well as bricks for buildings, but as time went on, people found other uses for this prehistoric technology. Techniques were added to give these products more eye-catching designs. Objects were often coated with glaze, so they would be smoother and more pleasant to touch. This helped to transform these practical items into works of art. People would pay large amounts of money for pieces of ceramic art and use them to decorate their homes. In modern times, architects and inventors discovered that ceramic offered the perfect balance between beauty and durability, and started using it in their products as well. Ceramics have found a home in the world of automobiles as they are used to produce several products. They are often used to make brake discs, engines, and other parts because ceramics are able to withstand extremely hot temperatures. Ceramics also play a part in the world of medicine, as their flexibility and strength are perfect for creating sturdy dental implants. Other doctors are using them to replace damaged bones because they are able to bond with tissues in the body without causing adverse reactions. In many kitchens today, you will also find ceramic knives. Once they are produced, the hard edges of these blades rarely need to be sharpened. Unlike metal knives, they won’t rust when exposed to difficult conditions. Ceramics also help to make it possible for humans to travel into space. Space shuttles are designed with ceramic tiles because they are one of the few materials that can stand the extreme heat when reentering the Earth’s atmosphere, plus they don’t wear out easily. With so many useful applications, it is hard to deny that ceramic technology is out of this world.
3. Why are ceramics useful when making dental products?

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Is It Safe?
Fracking is a way of getting energy from the ground. First, a special liquid is put into the ground. This liquid cracks rocks under the ground. After the rocks are cracked, oil moves through the cracks. Then it is much easier to take the oil from the ground. Fracking was started in 1947. These days, we are doing more and more fracking. That is why everyone is suddenly talking about it. A lot of people say that fracking is a good way to get energy. There is some gas that is very difficult to take from the ground. If we didn’t use fracking, we would not be able to get this oil. They say that because the world need more energy, we have to use fracking. Also, it is said that fracking creates a lot of jobs. However, many people are against fracking. They say that fracking’s “special liquid” pollutes the ground, the water, and the air. People who live near fracking areas could have health problems. Moreover, fracking is very loud. In some countries, fracking is now illegal. The first country to make fracking illegal was France. They did that in 2011. In other countries like England, fracking is legal, but there are many rules that control it. Other countries are waiting to learn more about fracking before they decide whether or not to allow it. However, fracking is very big in the United States. The US is number one fracking country in the world. People who support fracking say that it can be very safe. They say that first, we need strong laws to make sure that fracking is always done safely. Second, they say that fracking needs safe methods and good technology. It is said by many that after we develop these things, fracking will be great for the whole world. However, other people want fracking to be illegal everywhere. They say that it will never be safe. We still don’t know enough about fracking. After we learn more about it, we can decide whether it is really a safe way to get energy or not.
3. All of the following are true about fracking EXCEPT that __________

Why is it that flying to New York from London will leave you feeling less tired than flying to London from New York? The answer may be a clear case of biology not being able to keep up with technology. Deep inside the brain there is a "clock" that governs every aspect of the body's functioning: sleep and wake cycles, levels of alertness, performance, mood, hormone levels, digestion, body temperature and so on. It regulates all of these functions on a 24-hour basis and is called the circadian clock (from the Latin, circa "about" + dies "day").

This body clock programmes us to be sleepy twice a day, between 3-5 a.m and again between 3-5 p.m. Afternoon tea and siesta times are all cultural responses to our natural biological sleepiness in the afternoon. One of the major causes of the travelers' malady known as jet lag is the non-alignment of a person's internal body clock with clocks in the external world. Crossing different time zones confuses the circadian clock, which then has to adjust to the new time and patterns of light and activity. To make matters more complex, not all internal body functions adjust at the same rate. So your sleep/wake may adjust to a new time zone at one rate, while your temperature adjusts at a different pace. Your digestion may be on a different schedule altogether.

Though we live in a 24-hour day, the natural tendency of the body clock is to extend our day beyond 24 hours. It is contrary to our biological programming to shrink our day. That is why travelling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quantity and quality than eastward flights. When flying west, you are "extending" your day, thus travelling in the natural direction of your internal clock. Flying eastward will involve "shrinking" or reducing your day and is in direct opposition to your internal clock's natural tendency.

One of the more common complaints of travelers is that their sleep becomes disrupted. There are many reasons for this: Changing time zones and schedules, changing light and activity levels, trying to sleep when your body clock is programmed to be awake, disruption of the internal circadian clock and working longer hours. Sleep loss, jet lag and fatigue can seriously affect our ability to function well. Judgment and decision-making can be reduced by 50%, attention by 75 percent, memory by 20 percent and communication by 30 percent. It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destination's schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone.

According to the article, ________

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The panda's ...... habitat is the bamboo forest.

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There is a strange symbol ..................... the screen.

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Microwave Magic
The 20th century was a time in which many great inventions were created. Things like the automobile, computers, and the Internet truly changed the way we live forever. Yet, one handy invention that has made eating at home far more convenient is often overlooked. The invention of microwave allowed even the worst cooks in the world to prepare a meal in essentially no time at all. What is really fascinating about microwave ovens is that they were invented by accident. During World War II, British scientists discovered a device called a magnetron that can produce microwaves. They hoped it would help them quickly identify German planes that were intent on bombing their nation. However, it would be an American scientist named Percy Spencer who linked microwaves with cooking food. One day, Spencer brought a candy bar with him to work, and he stored it in his shirt pocket. While walking through a radar set, he noticed that the radar had somehow melted his treat. Afterwards, Spencer and his coworkers started to experiment with heating other things. They tried heating some popcorn kernels and it worked like a charm. Next, they tried to cook an egg with microwaves, but it literally blew up in their face. In 1945, the company that Spencer worked for, Raytheon, filed a patent for the technology and started working on ways to make microwave ovens more efficient. The first commercial microwave ovens hit the market, and an industry was born. In the first few years, things didn’t appear too promising. Early microwaves were quite expensive and they were big and chunky, so it was difficult to fit them in most kitchens. Yet, people did see the benefit an ease of being able to cook foods so quickly. Therefore, once manufacturers were able to shrink the device and bring down the price a bit, sales started to skyrocket. By 1986, approximately 25 percent of Americans had a microwave oven in their kitchen. Through the years, many people have questioned the safety and potential negative health effects of microwaves, fearing that the technology was a little too good to be true. Yet, some studies have shown that microwaving food actually helps it to retain more nutrients because of the short cooking times and minimal water required. However, it is essential to use microwave containers to avoid harmful chemicals from possibly leaking into your food. Microwave dishes may never be seen as gourmet cooking, but when you are in a hurry, nothing beats this method of cooking.
4. What best matches the meaning of the phrase “_worked like a charm_” in paragraph 2?

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The Magical Mind of Leonardo Da Vinci
When someone shows great skills in a certain field, we call them a genius. In particular, the term is most associated with two people. One is the famed scientist Albert Einstein, and the other is Leonardo Da Vinci. However, unlike Einstein, whose achievements were essentially all related to science, Leonardo Da Vinci was a master at art, architecture, invention, and several other areas. Da Vinci was bom in Italy in 1452. He took to art at an early age and at age 14, he went to study as an apprentice in Florence under the artist Verrocchio. For the next six years. Da Vinci picked up drawing, carpentry, sculpting, and many other techniques from his master and his talent was evident. In fact, Da Vinci was such a good painter that his talent frustrated his master. Eventually, Verrocchio was so frustrated by his student’s genius that he stopped painting altogether. By the age of 20, Da Vinci was considered a master artist and set up his own workshop. It was there that Da Vinci was approached to create a painting for the Duke of Milan. The Duke was so impressed by his work that he would bring him under his service. In addition to creating paintings and sculptures, the Duke also had him design innovative buildings, machines, and weapons. Da Vinci would draw up plans for several futuristic inventions including tanks, submarines, and flying machines. He also mastered the art of drawing every muscle and detail of the human body. The only criticism one could make of Da Vinci is that his brilliant mind jumped so quickly from subject to subject that he rarely completed the works he started. The ones he did finish were often spectacular masterpieces, such as his paintings The Last Supper and the timeless Mona Lisa. The latter, which is on display at the Louvre in Paris, is arguably the most famous painting of all times because of its incredible detail and realism. Although Da Vinci died in 1519, his effect on the art world has never waned. He helped coin the term “Renaissance man” which refers to someone who excels in many different areas. Perhaps the greatest present Da Vinci left behind was his journals. Admirers and students of his work can examine 13,000 pages of his notes, drawings, and ideas to better understand what made this genius tick.
5. What could replace the word “waned” in paragraph 3?

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:
The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building.
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina. And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae - areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time.
A frog’s vision is distinguished by its ability to perceive things as a constant motion picture. Known as “bug detectors”, a highly developed set of cells in a frog’s eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn’t see them as food and would starve. The bee has a “compound” eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee’s eye also gauges flight speed. And if that is not enough to leave our 20/20 “perfect vision” paling into insignificance, the bee is capable of seeing something we can’t - ultraviolet light.
Thus, what humans consider to be “perfect vision” is in fact rather limited when we look at other species. However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.

According to the passage, which of the following is NOT true?

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Of all modern instruments, the violin is apparently one of the simplest. It consists in essence of a hollow, varnished wooden sound box, or resonator, and a long neck covered with a fingerboard, along which four strings are stretched at high tension. The beauty of design, shape, and decoration is no accident. The proportions of the instrument are determined almost entirely by acoustical; considerations. Its simplicity of appearance is deceptive. About 70 parts are involved in the construction of a violin. Its tone and its outstanding range of expressiveness make it an ideal solo instrument. No less important, however, is its role as an orchestral and chamber instrument. In combination with the larger and deeper-sounding members of the same family, the violins form the nucleus of the modern symphony orchestra.
The violin has been in existence since about 1550. Its importance as an instrument in its own right dates from the early 1600’s, when it first became standard in Italian opera orchestras. Its stature as an orchestral instrument was raised further when in 1626 Louis XIII of France established at his court the orchestra known as Les vinq-quatre violons du Roy (The King’s 24 Violins), which was to become widely famous later in the century.
In its early history, the violin had a dull and rather quiet tone resulting from the fact that the strings were thick and were attached to the body of the instrument very loosely. During the eighteenth and nineteenth century, exciting technical changes were inspired by such composer- violinists as Vivaldi and Tartini. Their instrumental compositions demanded a fuller, clearer, and more brilliant tone that was produced by using thinner strings and a far higher string tension. Small changes had to be made to the violin’s internal structure and to the fingerboard so that they could withstand the extra strain. Accordingly, a higher standard of performance was achieved, in terms of both facility and interpretation. Left-hand technique was considerably elaborated, and new fingering patterns on the fingerboard were developed for very high notes.

According to the passage, early violins were different from modern violins in that early violins     .

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Where’s the ____________ dress that your boyfriend gave you?

The ability to conduct electricity is one of the key properties of a metal. Other solid material such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what are known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together.

An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the 'lead' of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.

Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor or electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.

Salt in its solid state is not able to conduct electricity because________.

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When did you have it? → How long

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Carbohydrates, which are sugars, are an essential part of a healthy diet. They provide the main source of energy for the body, and they also function to flavor and sweeten foods. Carbohydrates range from simple sugars like glucose to complex sugars such as amylose and amylopectin. Nutritionists estimate that carbohydrates should make up about one-fourth to one-fifth of a person's diet. This translates to about 75- 100 grams of carbohydrates per day. A diet that is deficient in carbohydrates can have an adverse effect on a person's health. When the body lacks a sufficient amount of carbohydrates it must then use its protein supplies for energy, a process called gluconeogenesis. This, however, results in a lack of necessary protein, and further health difficulties may occur. A lack of carbohydrates can also lead to ketosis, a buildup of ketones in the body that causes fatigue, lethargy, and bad breath.
1. What is the main idea of this passage?

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the
clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water. The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity. Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.
In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh water.

Which of the following is NOT true about London’s water supply in the middle of the 16th century?

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Da Lat is the coolest place ..................... Vietnam.

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There are three valid arguments to support the preservation of endangered species. Aesthetic justification contends that biodiversity contributes to the quality of life because many of the endangered plants and animals are particularly appreciated for their unique physical beauty. The aesthetic role of nature in all its diverse forms is reflected in the art and literature of every culture attaining symbolic status in the spiritual life of many groups. According to the proponents of the aesthetic argument, people need nature in all its diverse and beautiful forms as part of the experience of the world.
Another argument that has been put forward, especially by groups in the medical and pharmacological fields, is that of ecological self-interest. By preserving all species, we retain a balance of nature that is ultimately beneficial to humankind. Recent research on global ecosystems has been cited as evidence that every species contributes important or even essential functions that may be necessary to the survival of our own species. Some advocates of the ecological argument contend that important chemical compounds derived from rare plants may contain the key to a cure for one of the diseases currently threatening human beings. If we do not protect other species, then they cannot protect us.
Apart from human advantage in both the aesthetic and ecological arguments, the proponents of a moral justification contend that all species have the right to exist, a viewpoint stated in the United Nations World Charter for Nature, created in 1982. Furthermore, if humankind views itself as the stewards of all the creatures on Earth, then it is incumbent upon human beings to protect them, and to ensure the continued existence of all species. Moral justification has been extended by a movement called “deep ecology,” the members of which rank the biosphere higher than people because the continuation of life depends on this larger perspective. To carry their argument to its logical conclusion, all choices must be made for the biosphere, not for people.

Which of the arguments supports animal rights?