Read the following passage and choose the best answer (A, B, C, D):
Pollutants in the air aren’t always visible and come from many different sources. Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution - some visible, some invisible - that contribute to global warming. Generally any substance that people introduce into the atmosphere that has damaging effects on living things and the environment is considered air pollution. Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. In the past 150 years, such activities have pumped enough carbon dioxide into the atmosphere to raise its levels higher than they have been for hundreds of thousands of years. Other greenhouse gases include methane - which comes from such sources as swamps and gas emitted by livestock - and chlorofluorocarbons (CFCs), which were used in refrigerants and aerosol propellants until they were banned because of their deteriorating effect on Earth’s ozone layer. Another pollutant associated with climate change is sulfur dioxide, a component of smog. Sulfur dioxide and closely related chemicals are known primarily as a cause of acid rain. But they also reflect light when released in the atmosphere, which keeps sunlight out and causes Earth to cool. Volcanic eruptions can spew massive amounts of sulfur dioxide into the atmosphere, sometimes causing cooling that lasts for years. In fact, volcanoes used to be the main source of atmospheric sulfur dioxide; today people are. Industrialized countries have worked to reduce levels of sulfur dioxide, smog, and smoke in order to improve people’s health. But a result, not predicted until recently, is that the lower sulfur dioxide levels may actually make global warming worse. Just as sulfur dioxide from volcanoes can cool the planet by blocking sunlight, cutting the amount of the compound in the atmosphere lets more sunlight through, warming the Earth. This effect is exaggerated when elevated levels of other greenhouse gases in the atmosphere trap the additional heat.
4. What is NOT mentioned as a feature of sulfur dioxide?

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Classrooms have changed considerably in the last hundred years. In the early 1900s, the (1) ______ class in England was twice as big as the average in the 1960s – sixty pupils per class compared with thirty. Nowadays, the average class size in a secondary school is twentythree, (2) ______ is still higher than in many other countries. A hundred years (3) ______, teachers were stricter than today. Punishment was also more severe: pupils were often hit for bad behaviour - a practice not allowed in schools today. The curriculum in the past was also (4) ______ extensive and concentrated on the three Rs - Reading, Writing and Arithmetic – whereas today’s curriculum includes everything from business studies to philosophy. Some people think that the teaching methods used in schools today are not as (5) ______ as those used in the past but, given the wide range of interactive tools available today, the 21st century is definitely the most interesting time to be in the classroom for teachers and pupils alike

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When it comes to cooking, boomers cook one, Generation X cooks another way and the beat generation does things that must be recorded now, because once they have passed out of fashion, they will never be discovered again. They have weird skills, derived from scarcity in their early years. They keep their spices in brown glass because they last longer. For practical purposes, this means everything is in an old Calpol bottle with “sumac” scrawled over it. Some of them are, and will fish an empty packet of sugar out of the bin, shake a quarter-teaspoon of sugar from it and put it back. They can often make a cake by eye, without weighing anything, which I find incredible, and they know what to do with leaf gelatine, which is great until it isn’t. My mother once made avocado in jelly and then said: “I don’t know, the proportions may have been slightly off.” I said, recklessly: “Don’t worry – I’m sure I’ll choke it down,” but when it came to it, my cutlery bounced off it, like a prank played on a very hungry person in a cartoon. The beat generation canon is Meat at Any Price and Fish at Any and anything to do with mince. The descent of mince from a sacred food to a bolognese-only staple is one of the great mysteries of progress, because it is delicious even when you don’t shove a load of tomato in it. But you can’t just shove cheap meat in a pan and watch while it sweats out watery grey juice. This seems to be something that only wartime generations understand. Hip parents in the 70s, or regular parents in the 80s, or quite trad parents in the 90s had a horror of overcooked carrots and waterlogged cabbage. The very smell of cooked vegetables evoked for them every bad memory of British cuisine, before anchovies and Italians and radicchio arrived, when all dinner was a school dinner. So they would all just tease their vegetables with a hint of boiling water, before turning them out, still basically a salad, only a bit warmer. Then you, their offspring, would leave home, and accidentally encounter a vegetable that had been cooked, and realise how delicious it was and now you probably overcook your vegetables a bit, and your children will go the other way.  
6. The word “hint” in paragraph 4 is closest in meaning to _______

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The field of 3-D printing comes with a new set of legal questions hospitals using the  technology will need to consider, said Bruce Kline, a technology licensing manager who oversees patents for new technology developed at Mayo Clinic. For starters, he said the STL file printers use are a lot like MP3 music files, in that they can be protected under copyright and require licensing to use. Copyright violations can occur if a purchased STL anatomical model file for rare disease is illegally shared with another institution that did not purchase the file from the vendor that created the file.  Under the law, if a device has a functional use it falls under patent law. If it is not functional, it falls under copyright law. Kline said most medical 3-D printing for educational models and complex anatomy evaluation currently falls under copyright. But, he said that will rapidly change in the coming years as customizable 3-D printable medical devices see wider use.  Additive manufacturing (AM) allows the creation of patient-specific devices at the point of care. Kline said an interesting fact is that these devices are FDA 510(k)-exempt if produced by a hospital instead of a medical device vendor. He said this blurs the lines between traditional vendor relationships, since the hospital can now become the manufacturer. However, if a hospital makes a device, it also becomes liable for it. He advised that it might be better for a commercial vendor to make the device for the hospital so the vendor assumes the liability of the device. Custom-made medical devices are also exempt under FDA regulations, Kline said. So, if a physician creates or modifies a device to meet the clinical needs of a specific patient’s anatomy, he said it is acceptable to use under current FDA rules. This may leave the door wide open for use of 3-D printed devices that are customized for each patient using their own 3-D imaging datasets.  It is possible printable device files may become available in the next few years to customize and print on demand. However, Kline said it will be much more difficult to enforce patents on these types of devices. He explained if someone makes one or two devices, there is no economical way for the creator of those device files to go after the user/maker of of unlicensed copies of the device to claim lost profits.
8. Which of the following can be inferred from the passage?

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People who do not smoke, are not obese, and consume alcohol moderately can expect to live seven years longer than the general population, and to spend most of these extra years in good health, according to a new study published today in Health Affairs. This study was the first to analyze the cumulative impact of several key health behaviours on disability-free and total life expectancy. Previous studies have looked at single health behaviours. Mikko Myrskylä and his colleague instead examined several behaviors simultaneously, which allowed them to determine how long and healthy the lives of people who had avoided most of the well-known individual behavioral risk factors were. The researchers noted that each of the three unhealthy behaviours – obesity, smoking, and unhealthy consumption of alcohol – was linked to a reduction in life expectancy and to an earlier occurrence of disabilities. But there were also differences: smoking was found to be associated with an early death but not with an increase in the number of years with disability, whereas obesity was shown to be associated with a long period of time with disability. Excessive alcohol consumption was found to be associated with both decreased lifespan and a reduced number of healthy years. However, the absence of all of these risky healthy behaviors was found to be associated with the greatest number of healthy years. The most striking finding was the discovery of a large difference in average lifespan between the groups who were the most and the least at risk. Men who were not overweight, had never smoked, and drank moderately were found to live an average of 11 years longer than men who were overweight, had smoked, and drank excessively. For women, the gap between these two groups was found to be even greater, at 12 years. “Our results show how important it is to focus on prevention. Those who avoid risky health behaviours are achieving very long and healthy lives. Effective policy interventions targeting health behaviors could help larger fractions of the population to achieve the health benefits observed in this study,” the researcher emphasized. These results are important not only for individuals, but also for society. In an aging society, the health of the elderly determines the amount of money spent on the health system. In addition, healthy elderly people are better able to participate in the labor market and to perform social roles, such as caring for grandchildren.  
2. The word “cumulative” in paragraph 2 is closest in meaning to _______

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Many AI researchers roll their eyes when seeing this headline: “Stephen Hawking warns that rise of robots may be disastrous for mankind.” And as many have lost count of how many similar articles they’ve seen. Typically, these articles suggest we should worry about robots rising up and killing us because they’ve become conscious and/or evil. On a lighter note, such articles are actually rather impressive, because they succinctly summarize the scenario that AI researchers don’t worry about. That scenario combines as many as three separate misconceptions: concern about consciousness, evil, and robots. If you drive down the road, you have a subjective experience of colors, sounds, etc. But does a self-driving car have a subjective experience? Does it feel like anything at all to be a self-driving car? Although this mystery of consciousness is interesting in its own right, it’s irrelevant to AI risk. If you get struck by a driverless car, it makes no difference to you whether it subjectively feels conscious. In the same way, what will affect us humans is what superintelligent AI does, not how it subjectively feels. The fear of machines turning evil is another red herring. The real worry isn’t malevolence, but competence. A superintelligent AI is by definition very good at attaining its goals, whatever they may be, so we need to ensure that its goals are aligned with ours. Humans don’t generally hate ants, but we’re more intelligent than they are – so if we want to build a hydroelectric dam and there’s an anthill there, too bad for the ants. The beneficial-AI movement wants to avoid placing humanity in the position of those ants In fact, the main concern of the beneficial-AI movement isn’t with robots but with intelligence itself: specifically, intelligence whose goals are misaligned with ours. To cause us trouble, such misaligned superhuman intelligence needs no robotic body, merely an internet connection – this may enable outsmarting financial markets, out-inventing human researchers, out-manipulating human leaders, and developing weapons we cannot even understand. Even if building robots were physically impossible, a super-intelligent and superwealthy AI could easily pay or manipulate many humans to unwittingly do its bidding. The robot misconception is related to the myth that machines can’t control humans. Intelligence enables control: humans control tigers not because we are stronger, but because we are smarter.  
7. The following sentences are true, EXCEPT ______

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 following questions:
Tourism and Heritage Protection Travelling is a great thing to do. It helps us learn about different people and different places. Some people travel because they want to see nature. Others travel because they want to make friends and try great food. Of course, a lot of tourists are interested in traditional culture.
Tourism can be very good for traditional cultures. This is because when people travel to another country, they often want to learn more about that country’s traditions, such as music, food, and history. Therefore, the local people in that country will keep their traditional culture alive. They will wear traditional clothing, and sell traditional food. They will also have shows for tourists. These shows can be dances, concerts, plays, or something else.
Tourism also helps people respect each other. If you understand another culture well, you will probably respect that culture much more. You will probably want to protect that culture as well. However, tourism is not always good for traditional culture. Many people say that tourism creates “fake traditional culture”. This means that the local people wear traditional costumes, and do traditional dances only for tourists, but that is not their real lifestyle. Their real lifestyles are similar to the tourists’ lifestyle. They are just pretending because they want to make money.

What is one problem that tourists create?

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The process of communication has so importance at present moment. It has great expansion and is a necessary agent of socialization. The social communication has great power in the human species, from the origin of the history. The media of social communication can be television, radio, cinema, written or audiovisual press and highways of the information. They do, generally, universalization of the culture of the people. They extend the horizons and the limits between countries. They promote new social models, conducts and values. And they promote a dominant ideology. Often, the media of social communication are very far from the reality of the individuals. They, generally, do not perceive the habitual context of the persons. The social media complement and collaborate in the process of socialization of the new generations, from a positive opinion. Advertising and commercial messaging, pose consumerist models, from a negative perspective. The mass media convert a genuine culture into a consumer society. The advertising stimulates the need to consume, desperately. It transforms the persons into consumers of products. The advertising has a great power on the persons and it transports a serious addiction. The family, the educational system and the society, must allow the process of socialization and formation, to all people. They also must give the tools of analysis and the critique. They also must give offers of interesting things. They must promote the respect to the desires and different opinions. They also must promote the capacity of choice. The mass media influence the children and young people. They have models of identification, values, guidelines and policies. Often, they do not coincide with the own reality. They can serve to think. The mass media influence the process of social adjustment  
3. According to paragraph 2, what is NOT the work of the information media?

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NASA is developing the capabilities needed to send humans to an asteroid by 2025 and Mars in the 2030s – goals outlined in the bipartisan NASA Authorization Act of 2010 and in the U.S. National Space Policy, also issued in 2010. Mars is a rich destination for scientific discovery and robotic and human exploration as we expand our presence into the solar system. Its formation and evolution are comparable to Earth, helping us learn more about our own planet’s history and future. Mars had conditions suitable for life in its past. Future exploration could uncover evidence of life, answering one of the fundamental mysteries of the cosmos: Does life exist beyond Earth? While robotic explorers have studied Mars for more than 40 years, NASA’s path for the human exploration of Mars begins in low-Earth orbit aboard the International Space Station. Astronauts on the orbiting laboratory are helping us prove many of the technologies and communications systems needed for human missions to deep space, including Mars. The space station also advances our understanding of how the body changes in space and how to protect astronaut health. Our next step is deep space, where NASA will send a robotic mission to capture and redirect an asteroid to orbit the moon. Astronauts aboard the Orion spacecraft will explore the asteroid in the 2020s, returning to Earth with samples. This experience in human spaceflight beyond low-Earth orbit will help NASA test new systems and capabilities, such as Solar Electric Propulsion, which we’ll need to send cargo as part of human missions to Mars. Beginning in FY 2018, NASA’s powerful Space Launch System rocket will enable these “proving ground” missions to test new capabilities. Human missions to Mars will rely on Orion and an evolved version of SLS that will be the most powerful launch vehicle ever flown. A fleet of robotic spacecraft and rovers already are on and around Mars, dramatically increasing our knowledge about the Red Planet and paving the way for future human explorers. The Mars Science Laboratory Curiosity Rover measured radiation on the way to Mars and is sending back radiation data from the surface. This data will help us plan how to protect the astronauts who will explore Mars. Future missions like the Mars 2020 rover, seeking signs of past life, also will demonstrate new technologies that could help astronauts survive on Mars. Engineers and scientists around the U.S. are working hard to develop the technologies astronauts will use to one day live and work on Mars, and safely return home from the next giant leap for humanity. NASA also is a leader in a Global Exploration Roadmap, working with international partners and the U.S. commercial space industry on a coordinated expansion of human presence into the solar system, with human missions to the surface of Mars as the driving goal.  
2. The word "comparable" in paragraph 2 mostly means ______

Choose the best answer:
My parents insist me on learning Spanish.

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Aging is the process of growing old. It occurs eventually in every living thing provided, of course, that an illness or accident does not kill it prematurely. The most familiar outward signs of aging may be seen in old people, such as the graying of the hair and the wrinkling of the skin. Signs of aging in a pet dog or cat include loss of playfulness and energy, a decline in hearing and eyesight, or even a light graying of the coat. Plants are too, but the signs are much harder to detect. Most body parts grow bigger and stronger, and function more effiiently during childhood. They reach their peak at the time of maturity, or early adulthood. After that, they begin to decline. Bones, for example, gradually become lighter and more brittle. In the aged, the joints between the bones also become rigid and more inflxible. This can make moving very painful. All the major organs of the body show signs of aging. The brain, for example, works less effiiently, and even gets smaller in size. Thinking processes of all sorts are slowed down. Old people often have trouble in remembering recent events. One of the most serious changes of old age occurs in the arteries, the blood vessels that lead from the heart. They become thickened and constricted, allowing less blood to flw to the rest of body. This condition accounts, directly or indirectly, for many of the diseases of the aged. It may, for example, result in heart attack. Aging is not a uniform process. Different parts of the body wear out at the different rates. There are differences among people in their rate of aging. Even the cell of the body differ in the way they age. The majority of cells are capable of reproducing themselves many times during the course of a lifetime. Nerve cells and muscle fiers can never be replaced once they wear out. Gerontologists - scientists who study the process of aging - believe this wearing out of the body is controlled by a built-in biological time-clock. They are trying to discover how this clock works so that they can slow down the process. This could give man a longer life and a great number of productive years.
7. What is the main idea of the last paragraph?

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In 1860 the United States was predominantly rural. Most people were engaged in  agriculture, and about 80 percent of the population actually resided on farms or in small villages. Only 20 percent lived in towns and cities of 2,500 or more, the census definition of an urban area after 1880. New York alone in 1860 had more than 1 million people, and only 8 cities could boast about a population of more than 100,000. Thereafter the transition from a rural to a predominantly urban nation was especially remarkable because of its speed. By 1900, urbanization, with all of its benefits, problems, and prospects for a fuller life, became the mark of modern America The changing physical landscape reflected the shift to an urbanized society. Railroad terminals, factories, skyscrapers, apartment houses, streetcars, electric engines, department stores, and the increased pace of life were all signs of an emerging urban America. Indeed, the vitality, dynamic quality, variety, and restless experimentalism in society centered in the urban communities where the only constant factor was change itself.  Urbanization did not proceed uniformly throughout the nation. New England and the Middle Atlantic states contained the highest percentage of city dwellers. In the Middle West, the growth of cities such as Chicago, Milwaukee, Cleveland, and St. Louis showed the importance of urbanization in that region. The three West Coast states also experienced rapid urban growth. In the South, urbanization developed much more slowly, although by 1910 the expansion of transportation, commerce, and industry had greatly increased the population of older cities such as New Orleans and stimulated the growth of new urban centers such as Birmingham. However, the South remained predominantly rural. Only somewhat more than 20 percent of the population in that region was urban by 1910.  In some regions the urban impact had a depressing effect upon the surrounding rural communities. Much of New England in the late nineteenth century presented a discouraging picture of abandoned farms and sickly villages as people forsook the countryside and rushed to the larger towns and cities. In the Middle West, particularly Ohio and Illinois, hundreds of townships lost population in the 1880’s.
2. According to the passage, which of the following was the census definition of an urban area after 1880?

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He works as a/ an .................... in his uncle’s workshop.

Rewrite the sentence:
I am really keen on playing sports.

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The era of “smart cities”, controlled by an ecosystem of sensors, cameras and  algorithms, is fast approaching. In China, state media claim 500 are under construction. In Canada, Alphabet has plans for turning parts of Toronto into a timber-framed tech town as a prototype. Incremental steps are also making cities smarter. Last week, Transport for London announced plans to track Tube passengers through WiFi to monitor congestion. In the US, fast-food drive-throughs will trial number plates scanners to make ordering faster. Individually these services can improve daily life. Integrating them will create something more powerful than the sum of its parts.  Though convenience and safety are the end goals, serious questions about how city authorities will both store and share vast bodies of data must be answered. The fact that surveillance is built into key transport infrastructure will also make it increasingly difficult to avoid without disrupting daily life. The smart city risks creating a panopticon in the name of an easier and better life. The risks of anonymity disappearing will be increased by the use of different data sets, making it more likely that identifiable characteristics may appear. Closely linked to this is the question of data storage and sharing. The treasure trove of personal information will be a tempting target for hackers. This information might also be used by law enforcement, feeding into the existing dangers of mass surveillance and profiling, as is already the case in China.  These concerns have long been levelled at social media and internet-enabled home appliances. Smart city surveillance can be even more insidious. Users can avoid Facebook or hardware such as Alexa. Avoiding basic infrastructure will be near impossible without seriously affecting day-to-day life. TfL has put up signs warning customers of the WiFi tracking, yet the only choice is between tracking and having no signal. Reports on the facial recognition at airports in America suggest that avoiding being automatically scanned will be tough as well. As these systems become more closely enmeshed, avoiding snooping will become increasingly tricky.  The inevitable rise of smart cities is not inherently negative. Harnessing the power of technology and data can potentially help urban environments adapt to challenges such as climate change and overcrowding. Politicians, programmers and academics must work to ensure that does not come at the cost of all-seeing, 24-hour surveillance. 
7. Which of the following statements is TRUE, according to the passage?

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Rogue waves are extremely large waves that are more than double the average height of most waves. According to mathematical calculations and various personal accounts, rogue waves can reach remarkable heights. They appear unexpectedly in calm waters and can do major damage, even to large ships. Unlike tsunamis, which are practically undetectable in deep water, rogue waves only occur far out at sea. Stories about rogue waves have circulated amongst sailors for centuries, but it was not until recently that scientists confirmed they actually exist. What they still are not sure of, however, is what causes them. Some instances of rogue waves have been explained by the interactions of normal wave patterns with ocean currents. Scientists believe that it is possible for waves to reach the heights described when they come into contact with strong ocean currents. The wave heights increase significantly when a normal wave reaches a current head on. In other words, the wave is built up by the power of the current. This explanation was first proposed after scientists observed a high incidence of rogue waves in the ocean surrounding the southern tip of Africa. In fact, since 1990, at least twenty ships have encountered the waves, which reportedly reached up to 190 feet. The waves are thought to be caused by wave interactions with the strong Agulhas Current, which runs southbound along the east coast of the continent.  
1. The passage mainly discusses __________

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An integral part of human life is the sports. As we all know, many competitive and  entertaining activities are engaged in sports. A sport is a way to stay fit and healthy. If we want to be physically fit we have to have an active life to stay healthy, so it is always a good idea to participate in sports and games.  The sport has inherent discipline and physical demands so that enthusiasts tend to maintain a healthy lifestyle. Weight loss, more energy, better mobility and a lot of things can come from the sport. All of this can describe a good person’s health. People are taught by sports and games to appreciate their health. The energy and vitality necessary to participate cannot be sustained without health. For professional athletes, their fitness and health depend on their livelihood. Sport also aims to keep individuals in good health and endurance.  Water is the most important nutrient that we cannot live without. If you do sports, you tend to sweat more thus increase your metabolic rate. If you do not replace these fluids, you can have very serious health problems or you can even die. To have a healthy and active body we need to eat essential nutrients. Participating in sports activities will encourage you to drink more water since we develop the urge to do so when we participate in physical activities.  When participating in sports activities we come to learn new things. It makes us learn how to tackle things the difficult situation. Sports develop a sense of unity and brotherliness. It develops team spirit in us. It helps in developing mental and physical toughness. It improves our efficiency. With our day-in-day-out activities, we tend to become exhausted the more reason we need sports in our lives to help us forget stressful things we go through. Everybody should always play a sport once a week to keep themselves fit and healthy. Sport is a fundamental phase for a child who is learning. In education, it helps the students keep their value in life, students are taught various games in the very early stage of life at school. Nurturing sports talents from school encourages a lot of talented children and it affirms the sportsmanship in them. Those students who perform well are promoted to play at the national and international level. Sports can be a carrier developing option for many students.  As we know, a physical activity governed by a set of rules or habits is called sport. Sport is often involved in the competition. The sport was originally developed for recreation. When people want to do the distraction or recovery, they usually do sports, sports games or skill tests. From this, we can conclude that sport has large and varied manifestations.  Sport can be played indoors or outdoors. It can be done by individual or team, with or without competition. And we know that sport requires skill and physical effort. The growth and development of sport and its related industries were witnessed by modern sport. Because we know that a healthy person is a wealthy person, the sport is the secret of both health and prosperity. 
3. According to paragraph 2, what do sports teach people?

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Green-space facilities are contributing to an important extent to the quality of the urban environment. Fortunately it is no longer necessary that every lecture or every book about this subject has to start with the proof of this idea. At present, it is generally accepted, although more as a self-evident statement than on the base of a closely-reasoned scientific proof. The recognition of the importance of green-spaces in the urban environment is a first step on the right way; this does not mean, however, that sufficient details are known about the functions of green-space in towns and about the way in which the inhabitants are using these spaces. As to this rather complex subject I shall, within the scope of this lecture, enter into one aspect only, namely the recreative function of green-space facilities. The theoretical separation of living, working, traffic and recreation which for many years has been used in town-and-country planning, has in my opinion resulted in disproportionate attention for forms of recreation far from home, whereas there was relatively little attention for improvement of recreative possibilities in the direct neighbourhood of the home. We have come to the conclusion that this is not right, because an important part of the time which we do not pass in sleeping or working, is used for activities as possible, and the design of these has to be such that more obligatory activities can also have a recreative aspect. The very best standard of living is nothing if it is not possible to take a pleasant walk in the district, if the children cannot be allowed to play in the streets, because the risks of traffic are too great, if during shopping you can nowhere find a spot for enjoying for a moment the nice weather, in short, if you only feel yourself at home after the street-door of you house is closed after you.  
2. The underlined word “which” in the passage refers to ________

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Pollutants in the air aren’t always visible and come from many different sources. Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution - some visible, some invisible - that contribute to global warming. Generally any substance that people introduce into the atmosphere that has damaging effects on living things and the environment is considered air pollution. Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. In the past 150 years, such activities have pumped enough carbon dioxide into the atmosphere to raise its levels higher than they have been for hundreds of thousands of years. Other greenhouse gases include methane - which comes from such sources as swamps and gas emitted by livestock - and chlorofluorocarbons (CFCs), which were used in refrigerants and aerosol propellants until they were banned because of their deteriorating effect on Earth’s ozone layer. Another pollutant associated with climate change is sulfur dioxide, a component of smog. Sulfur dioxide and closely related chemicals are known primarily as a cause of acid rain. But they also reflect light when released in the atmosphere, which keeps sunlight out and causes Earth to cool. Volcanic eruptions can spew massive amounts of sulfur dioxide into the atmosphere, sometimes causing cooling that lasts for years. In fact, volcanoes used to be the main source of atmospheric sulfur dioxide; today people are. Industrialized countries have worked to reduce levels of sulfur dioxide, smog, and smoke in order to improve people’s health. But a result, not predicted until recently, is that the lower sulfur dioxide levels may actually make global warming worse. Just as sulfur dioxide from volcanoes can cool the planet by blocking sunlight, cutting the amount of the compound in the atmosphere lets more sunlight through, warming the Earth. This effect is exaggerated when elevated levels of other greenhouse gases in the atmosphere trap the additional heat.
5. What has been the main source of atmospheric sulfur dioxide recently?

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All families face challenges and hurdles as a normal part of life and getting through these times requires respectful communication and care for each other. However, some families face significant (1) _______ like not having a place to live, a parent going to court, a parent having a long-term illness, or parents having to work (2) ________ from home or for long hours.  Some families seem to fight and argue a lot, which can be really scary and stressful. Sometimes, family relationships can be so stressful that you feel unsafe and scared. These types of things make relationships (3) _________ and negative and it can make it difficult to feel like talking things through.  As a teenager you are going through a lot of changes within yourself physically, mentally, emotionally and socially. Often these changes (4) _________ at different rates and at different times. It is important for you to be aware of what is going on and how this may affect you at school, home and/or around family and friends having an understanding of adolescent development can be very (5) ______

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When you first arrive in a foreign culture, often your first reaction is completely positive. Everything seems exciting, different and fascinating. It’s an (1) ______. If you are just on a short holiday, you will probably never leave this phase. (2) ______, if you stay longer, your attitude can start to change. As you start to realize (3) ______ little you really understand the new culture, life can get frustrating. People misunderstand what you are trying to say, or they may laugh at you when you say something incorrectly. Even simple things, like posting a letter, can seem very difficult to you. Thus, you are likely to get angry or upset when things go wrong. With time, though, you start to (4) ______ to become more comfortable with the differences and better able to handle frustrating situations. Your (5) ______ of humor reappears. Finally, you may feel enthusiastic about the culture once again, enjoy living in it, and even prefer certain aspects of the culture to your own.