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The blazes, which have been burning across Australia for months, have razed homes  and wiped out entire towns. Across Australia, nearly 18 million acres of land have been burned – much of it bushland, forests and national parks, home to the country’s beloved and unique wildlife. Nearly half a billion animals have been impacted by the fires in NSW alone, with millions potentially dead, according to ecologists at the University of Sydney. That figure includes birds, reptiles, and mammals, except bats. It also excludes insects and frogs. The total number of animals affected nationwide could be as high as a billion, according to Christopher Dickman, the University of Sydney ecologist who led the report.  "The scale of these fires is unprecedented," said Dieter Hochuli, an environmental sciences professor at the University of Sydney. “There are substantial concerns about the capacity of these (ecosystems) to rebound from the fires.”  Some animals, like koalas and kangaroos for instance, are primarily killed by being incinerated in flames or choking on smoke. Nearly a third of all koalas in NSW have died and about a third of their habitat has been destroyed. Photos from the ground show koalas with singed fur, raw patches of burnt flesh, and blistered paws. Even if they are rescued and treated, sometimes their injuries are simply too extensive to survive. Wombats have also been hit hard – they don’t cope well with heat or stress, and panic at the smell of smoke. The small, stubby-legged marsupials can’t run very fast or far, and are largely at the mercy of the flames. Smaller mammals and reptiles can escape the blazes by burrowing underground or hiding in rocks – but afterward, there is no food or shelter left, only certain predators that are drawn to fire because they know it brings easy prey. Koalas and kangaroos are spread out across the country, so they’re not in danger of going extinct due to the blazes. But other animals that live in niche environments and have smaller populations may have been wiped out entirely; these include the eastern bristlebird, the mountain pygmy possum and the corroboree frog.  These animals’ recovery depends not only on their population size, but also on the condition of their habitat. For instance, plants grow slower in high-altitude alpine regions, meaning it could be a very long time before species are able to return.
3. The word “It” in paragraph 1 refers to _____

Rewrite the sentence:
Niggli first visited Viet Nam in 1999. He has been a generous sponsor of underprivileged Vietnamese children since then.

What is 'extreme' weather? Why are people talking about it these days? 'Extreme' weather is an unusual weather event such as rainfall, a drought or a heat wave in the wrong place or at the wrong time. In theory, they are very rare. But these days, our TV screens are constantly showing such  extreme weather events. Take just three news stories from 2010: 28 centimetres of rain fell on Riode Janeiro in 24 hours, Nashville, USA, had 33 centimetres of rain in two days and there was record  rainfall in Pakistan.

The effects of this kind of rainfall are dramatic and lethal. In Rio de Janeiro, landslides followed,  burying hundreds of people. In Pakistan, the floods affected 20 million people. Meanwhile, other parts of the world suffer devastating droughts. Australia, Russia and East Africa have been hit in the last ten years. And then there are unexpected heat waves, such as in 2003 in Europe. That summer, 35,000 deaths were said to be heat-related.

So, what is happening to our weather? Are these extreme events part of a natural cycle? Or are they caused by human activity and its effects on the Earth's climate? Peter Miller says it's probably a mixture of both of these things. On the one hand, the most important influences on weather events are natural cycles in the climate. Two of the most famous weather cycles, El Niño and La Niña, originate in the Pacific Ocean. The heat from the warm ocean rises high into the atmosphere and affects weather all around the world. On the other hand, the temperature of the Earth's oceans is slowly but steadily going up. And this is a result of human activity. We are producing greenhouse gases that trap heat in the Earth's atmosphere. This heat warms up the atmosphere, land and oceans.  Warmer oceans produce more water vapour - think of heating a pan of water in your kitchen. Turn up the heat, it produces steam more quickly. Satellite data tells US that the water vapour in the atmosphere has gone up by four percent in 25 years. This warm, wet air turns into the rain, storms, hurricanes and typhoons that we are increasingly experiencing. Climate scientist, Michael Oppenheimer, says that we need to face the reality of climate change. And we also need to act now to save lives and money in the future.

Satellites are used to________.

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Learning shouldn’t end when you reach a certain point in your career; it should be something you continuously pursue across your lifetime. As you mature, your areas of interest may change. Perhaps your personal and career goals may morph into something altogether different than what you originally intended. In some cases, life happens and you might find it necessary to take a break from your career or your education. But for people with a strong desire for lifelong learning, this pause is only temporary. Even though you may have begun an educational program and needed to take a pause later, it’s never too late to go back and finish what you started. People in modern age have more options to gain the knowledge they want and need. From a higher education standpoint, universities and colleges are working hard to transform themselves in different ways. For example, there has been a transition from traditional Ph.D.-style doctorates to applied doctorates like the Doctorate in Strategic Intelligence or Doctorate in Global Security. These academic programs have their students work to address real-world problems of practice. In this manner, they take the education they receive in their classes and work to apply it within the fields in which they are currently employed or hope to work in. In addition, some universities now offer dual degree programs, such as the dual master’s degree in emergency and disaster management and homeland security. Some institutions are also starting to provide accelerated degrees to allow their students to rapidly advance from a B.A. to an M.A., saving those students time and money on their educational pursuits. However, lifelong learning doesn’t just encompass full degree programs. With employers focusing on skillset development, there is an increasing desire for short program offerings as well. “Short programming” includes sets of courses that lead to a specific credential or badge. For instance, ASIS International offers a series of certifications, related to security and global studies, which can be used to add value to your professional portfolio. Another relevant certification is the Certified Threat Manager (CTM) certification offered by the Association of Threat Assessment Professionals. Short programming involves learning tracks, competency-based micro-credentials or stackable credentials. In some cases, certificates are perceived to be more valuable as they signal that their owner has current knowledge of a particular area; however, this perception differs from field to field
2. The word “it” in paragraph 1 refers to ________

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This French expansion can be traced back to Isle of France, or Ile-de-France, the  administrative region for Metropolitan Paris. It is often referred to as “the city of love” or “the city of lights”, now it can officially be called “Paris, the city of incredibly talented soccer players”.  In order to preserve the integrity of the international competition, FIFA tightened the rules on nationality and representation in 2004. The decision arrived amid a growing trend of so called “lesser” footballing nations naturalising players from a greater talent pool, typically from Brazil, to play for their national team. For example, Qatar offered citizenship to three Brazilians within a week having never lived or played football in the country, while Togo managed to naturalise five Brazilians for their national team. To prevent this, FIFA declared that any player wishing to represent a “new” nation must have a “clear connection” to it. A “clear connection”, according to FIFA, means that a player must have at least one parent or grandparent who were born in their newly chosen country.  The diversity of France, and Paris in particular, lends a hand to the range of national teams its citizens can represent. Along with many European migrants residing in Paris, France’s colonial history also means that a large proportion of African and Caribbean immigrants call Paris home. Famed French nationals Claude Makalele and Lilian Thuram both migrated with their families to Paris from Zaire and Guadeloupe respectively. By law, the French INSEE census does not collect data on religion or ethnicity so it is difficult to estimate the extent of diversity in the Ile-de-France region, but approximately 20% of its inhabitants were born abroad. One might conclude that an even larger percentage have at least one parent or grandparent who were part of the sizeable waves of immigrants arriving to Paris since WWI. These waves of migrations chiefly occurred in the late 19th century and up until WWI. It is unlikely that the current crop of footballers would have many feelings of nationalism toward the faraway countries of their grandparents. The advantage Paris has is that a vast majority of professional footballers may feel that their best opportunity to play for a national team would be with the country of their heritage. 
5. The word “residing” in paragraph 3 refers to _____

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Bagpipe music played, wreaths were sent and Amazing Grace was sung. A  black shroud was laid upon a makeshift urn. It was a funeral, of course, for which such displays of respect are common. But in this case, the people living in a small Nova Scotia community had gathered to pay their respects not to a person who had died, but to a post office.  The grief might have been hard for outsiders to understand, but not for those living in Head of St. Margaret’s Bay, N.S., where the post office run by Verna Dunlop was a big part of their small, tight-knit community. The post office, which had been located in the back of Dunlop’s home, was not just a utilitarian service kiosk where residents had to go to pick up their mail. According to locals, it was also a community hub where people gathered to catch up on the town gossip, or to enjoy a cup of the coffee the postmaster had been brewing for them. “It’s really the centre of the village,” said one woman, explaining what the post office meant to the people living there.  There had been a post office located in Head of St. Margaret’s Bay since before Confederation. And local residents spent months fighting to keep the one they had. But Canada Post made the decision to close it, as it was losing money. It was replacing the post office with sets of newly installed super mailboxes.  Many people in town weren’t convinced the coming changes were for the better. “We do not want those super mailboxes. We want to have a community life,” he said. At the mock funeral, Dunlop choked up as she said she hoped “this is going to stop,” alluding to the fact that it wasn’t just Head of St. Margaret’s Bay that was losing its post office. “We hope that the way of life that we’re used to we can keep,” she added. Canada Post had closed 40 such rural post offices that year and had long-term plans to close more than 5,000 of them across the country. “Just as Verna Dunlop’s post office came to symbolize for these people the best qualities of rural life, so does its passing remind them of the steady erosion of that way of life,” said Evans.
5. The word “they” in paragraph 3 refers to _____

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As places transformed, so did the people. When researchers at Yale University and the University of Westminster studied what images people associated with climate change, they found a shift this decade. When they began their study in 2003, the majority of people surveyed thought of melting polar ice. By 2016, more and more people had weather top of mind. Climate, to be clear, is not weather. It’s the difference between a trend and a one-off event. But with wetter storms and hotter summers unfolding over the course of the decade, people were making new connections between climate change and the weather. Seeing climate change through the lens of something they experience every day opens the door for people to see the weight of the issue over their own lives. “Americans are just beginning to connect the dots and to say, wait a second, what’s going on here,” says Anthony Leiserowitz, a lead author of the study and director of the Yale Program on Climate Change Communication. “There’s been this increasing dawning of awareness among many Americans that climate change is actually starting to harm people here and now.” New renewable energy projects outpaced new fossil fuel installations in worldwide growth for the first time in 2015. In a pivotal moment for the whole planet, every country on Earth agreed to take on climate change when they adopted the Paris climate accord in 2015. That committed countries to reducing their greenhouse gas emissions enough to keep the Earth from warming beyond roughly 1.5 degrees Celsius above pre-industrial levels, a threshold that could be catastrophic for people and ecosystems if it’s crossed. It was the culmination of years of political wrangling. “It is rare to have the opportunity in a lifetime to change the world,” former French president François Hollande told delegates gathered on the final day of negotiations. “Seize it so that the planet can live on, so that humanity can live on.” But cooperation, even when the health of the whole planet is on the line, can be a fragile, fleeting thing. After Donald Trump was elected president in 2016, he began the process of formally withdrawing the US from the Paris accord. One by one, Trump backtracked on existing federal efforts to cut down on pollution, too. The words “climate change” began disappearing from government websites and documents  
6. Which of the following statements is TRUE, according to the passage?

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In the future, maybe all cars that run on petrol will be replaced by solar cars, which  have been around for a while, but with recent (1)__________ in solar car design and the measurement of photovoltaic cells becoming smaller, the dream of a truly efficient solar car is more reality than fantasy.  A solar car is a vehicle (2)__________ by photovoltaic cells, also called solar cells, which convert sunlight (light energy) into electrical energy.  As a source of energy on earth, there is nothing like the sun: in a mere one thousandth of one second (.001), the sun emits enough energy to fulfill our planet’s (3)_______ needs for the next 5,000 years. It is a staggering fact, and an exciting one. Since the energy from the sun is responsible for renewable resources such as wind, tides, and heat, solar energy seems to offer the brightest future for not only cars, but for the entire energy crisis. Despite the appearance that solar energy may be the least feasible among the current crop of (4)_________ fuel propositions, new solar powered devices and more specifically solar powered cars are beginning to be developed. How do solar cars work?  The photo-voltaic cells absorb photons from sunlight. This action generates heat, which the cells then convert into electrical energy and stores in an on-board battery. This process of conversion is called the photovoltaic effect. Not surprisingly, such a vehicle has zero emissions, and is very (5)________ friendly. Unfortunately, at the moment photovoltaic cells are extremely inefficient, yet as time progresses the efficiency of these cells will grow. This will make solar energy and solar cars the fuel and car of the future-a closer reality

Each sentence has a mistake. Find it bychosing A B C or D

Energy conservation is any behavior it results in the use of less energy

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Our eyes are the window to our soul, so the saying goes, but they’re also a window into our health. Picking up eye problems early can significantly (1) ____ the chance of sight loss.  Several programs are looking at how to combine existing medical knowledge about our eyes with AI (Artificial Intelligence) tools.  Google DeepMind has teamed up with Moorfields Eye Hospital in London to work on (2) ____ two major conditions that cause sight loss: diabetic retinopathy and age-related macular (3) ____ (AMD). Together, these eye diseases affect more than 625,000 people in the UK and over 100 million people worldwide.  Algorithms have been trained using thousands of eye scans, then set to work detecting potential issues, allowing doctors (4) ____ the right course of action in a fraction of the time it would normally take and with a greater degree of certainty. DeepMind says that 300,000 UK patients a year could be helped (5) ____ the system is given the go ahead for general use following the completion of clinical trials

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Egypt’s 100 millionth citizen was born last week, undoubtedly a happy occasion for one family, but a moment filled with foreboding for a country struggling to contain a population explosion. In the past year the government has scrambled to stem the birth rate with a new program called “Two is Enough.” It is establishing family planning clinics throughout the country, where Egyptians can purchase heavily subsidized contraceptives. But many doctors and activists fear that this is too little, and comes too late to reverse the uptick in population growth. Doctors complain that the new “Two is Enough” program lacks in a clear strategy to bring down birthrates. The financial resources deployed thus far have been a fraction of previous efforts; some family-planning clinics have reportedly run out of contraceptives. While clinics funded by the campaign to provide some reproductive health education, sexual education remains taboo in Egyptian schools. There is also a lack of adequate services for the poor and pensioners. Many Egyptians opt to have more children in the hope they will look after them as they age, a phenomenon common in countries with high levels of poverty and inadequate safety nets. While over 30 million Egyptians live in poverty, only 9.4 million receive means-tested cash transfers from the government’s welfare programs. Economic reforms undertaken as part of a recently completed International Monetary Fund program have cut subsidies in a number of areas, contributing a spike in inflation that at one point exceeded 30%. For newborns like the 100-millionth Egyptian, the outlook is grim. A burgeoning population exacerbates many problems. Despite Egypt’s limited supply - it depends almost exclusively on the Nile - there has been a systemic failure to adequately address water waste. From wasteful megaprojects draining the Nile to literally dumping waste in the river, Egyptian officials have consistently failed to prudently protect what is perhaps the country’s most vital natural resource. In 2018, Egypt temporarily reduced the farming of rice, a water intensive crop - only to expand cultivation the following year. The New Administrative Capital that Sisi has set out to erect is projected to need 650,000 cubic meters of water per day when finished. Failure to quickly and dramatically improve water management practices in Egypt could be disastrous, and the risk is the greater for the country’s rapid population growth  
1. Which best serves as the title for the passage?

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While trust in media as a whole may be at an all-time low, a new study by the EBU has shown the public’s trust in traditional media (broadcast and the written press) is actually on the rise. However, people’s trust in new media continues to fall: 61% of European countries distrust the internet while 97% have no faith in social networks. The EBU’s new report – Trust in Media 2018 – shows the figures illustrating the differences between people’s trust in traditional and new media. Broadcast media remain the most trusted forms of media with 59% of people tending to trust radio (equivalent to 2017) and 51% trusting TV in the EU (an increase of 1 percentage point on 2017). Trust in the written press has also slowly improved over the last 5 years and it is now trusted by 47% of EU citizens. At the same time, people’s trust in the internet and social media has been eroded by fake news, misinformation and disinformation. Only 34% of EU citizens trust the internet and a mere 20% now trust social networks (down from 36% and 21% respectively in 2017). Trust in Media 2018 is based on data published in the 88th Eurobarometer survey and gives an idea of European citizens’ perception of the trustworthiness of different types of media. The survey consists of approximately 1000 face-to-face interviews in the 33 countries covered by the study. The report shows how European citizens’ trust in broadcast media is closely connected with a free and independent press. The higher the level of trust in a country’s radio and TV, the higher press freedom in that country tends to be. There are also strong regional differences with the Nordics and Albania tending to trust traditional media the most while Eastern Europeans tend to trust social networks and the internet more. The EBU’s Head of Strategy and the Media Intelligence Service Roberto Suárez Candel said: “The results of our research show that good quality, impartial media is highly valued by the public. “Public service media play an important role in that and, together, our Members make an invaluable contribution to society. The role of our public service Members in upholding democratic values and supporting media freedom is clearly demonstrated by the results of our research.”  
7. The word “upholding” in paragraph 4 is closest in meaning to _______

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Do you know that your place on the family ladder may have certain effects on the sort of person you grow up to be? You may be the only child, the eldest, youngest or (1) _______ one; you may be the youngest of three boys or the eldest girl with a younger brother and sister. All the different combinations of relationships will have helped to (2) __________ you the person you are. The number of years between your siblings and you also helps to shape your character. Knowing such details about your best friend or loved one (3) _______ also tell you about the type of friend or partner he needs. For example, a boy with a younger sister would normally get along much better (4) ______ a girl who has an older brother than with a girl who has a younger brother. Similarly, if your girlfriend is the oldest in her family, she would probably be domineering. Fortunately for all of us, family psychology is not (5) _______ accurate. There are always exceptions to the rule. Most important of all, we should always judge people according to who they are, not the relatives they have

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The year was 1810, the place was southern Germany, Bavaria, and life was hard. It was the month of October and all of the countryside had been working day and night to finish their fall harvest and prepare for the onset of winter. While the plow horses were working and the farmers’ days were filled from sun up to sun down, there were some other preparations being made as well. Prince Ludwig I and his entire court were preparing for his upcoming marriage to Princess Therese of Sachsen-Hildurghausen. The grand wedding was to take place on the 12th, right in the middle of the harvest. As you know any wedding can be difficult to plan, but when you’re a prince it can be even more stressful. The invitations had gone out, the garments had been made and the location had been selected. The big event was to be held in a magnificent “Weise” (meadow) just outside the gates of Munich. As the big day approached, the countryside and town, in fact all of Bavaria was a buzz with talk of the big day. Everyone was planning on attending as they were all exhausted from the harvest and it was really the last chance before the long, cold days of winter to get out and blow off some steam. On the 12th, the ceremony went off without a hitch. The weather was perfect, the bride looked beautiful and about 40,000 guests were in attendance. The reception, as you can imagine, was one of the biggest parties history had ever seen with copious amounts of beer and massive quantities of food being devoured. It was a reception fit for a prince. And this prince was absolutely ecstatic. Ludwig I was so taken with all of his guests that he planned a special treat for them. The prince knew that all of his subjects were huge fans of horseracing so he planned to conclude the event with a somewhat impromptu horse race across the great meadow. When the townspeople heard of this they erupted in a jubilant cry Zicke Zacka, Zicke Zacka, Hoy, Hoy, Hoy. This is still chanted in the beer tents of today’s Oktoberfest celebrations. It was then and there that they decided unanimously to rename the wiese Theresiewiese (Therese Meadow) in honor of the Prince’s new bride. This was their humble way of welcoming her to town. To this day that very meadow still bears her name. After a spectacular day and night — and probably more than a couple of hangovers — the great event came to an end. It was the following fall as the townspeople began to reminisce about the great time they had had the previous year (as do many of our Oktoberfest guests tend to do around the fall) that they decided to honor their prince and celebrate his wedding anniversary in much the same way. King Maximillian agreed, but this party was to be even bigger, better and longer than the first. The event became an annual celebration. And that my friends is how the Oktoberfest tradition began and continues today. As a side note, the beer that was poured all those years ago and that has been continually served at every Oktoberfest in Munich since will now be served at the Big Bear Lake Oktoberfest. The very same beer flowing from the taps in Munich, Germany will be the beer flowing from our taps in humble Big Bear Lake. And like the beer, our Burgermeister just happens to be a true German original as well. 
8. Which of the following is TRUE according to the passage?

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Mohammed BK, who aims to connect Somalis in Bristol with their heritage, has been  confirmed for the Somali Week Festival, in 2020. Mohammed BK has been named as “cultural ambassador” for the Somali community. Ayan Mohamoud who is UK’s Somaliland Ambassador told the BBC he will now become a fixed part of the annual festivities. She said: “Young people who don’t speak Somali at all have memorised his music word-for-word and that is something that has never been done before by any Somali artist. He has been touring the country promoting citizenship and cultural unity throughout his career.”  Susan Elmi, 25, has been a fan of Mohammed BK for many years. She said: "In the Somali culture many people communicated their emotions and thoughts through songs and poetry and this is going back centuries. This man is bringing that back and making the younger generation question and explore our rich legacy. I think it’s just what the Somali Diaspora needs to say well connected to the identity.”  Mohammed BK also promotes education and advises young people to “use their time and resources wisely here in the UK because that is something their parents sacrificed fleeing from their homeland”. He added: “I thought to myself if I have that much influence on thousands and thousands of young people from my community, I need to put my platform to good use in encouraging them to do good and seek opportunities”. Festival fan Ameira Hassan, 45, said: “It’s a huge thing for our kids to take part in their history and culture. It’s important to us because they are learning a lot. Twenty years ago we never used to have anything like this in the UK and our kids never had any knowledge of the Somali culture.” 
3. The word “they” in paragraph 3 refers to _______

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It was not until 1920 when women finally got the right to vote. This was 50 years after the male ex-slaves of the United States were gaining the right to vote. Though women had already right to vote, the stereotypes made women be restricted in their actions. Would you believe that women who were doing the same job as men were getting paid only the 60% of what man wear to paint? In fact, they were getting paid differently for doing exactly the same work. In the 1930s there was not a huge choice of workplace for women. They could still work as secretaries, nurses, teachers and social workers. These kinds of professions were considered typically female professions and were paid much less than other professions. That kind of restrictions themed unbearable for some women. They rejected to go on with this rules anymore. They changed their hair color, style appearance and started to fight against the existing stereotypes. Those women were named in history as “flappers”. The first time in history they started wearing short skirts which were something shocking to the society. They also started driving cars, drinking alcohol, which raised a huge boom. Those kinds of things were considered “Non-feminine”. Actions of flappers were accepted as radical, though they had their influence on the society finally. The heavy restrictions started disappearing every year and today we have what we have. For a very long time, women were considered inferior to men. However, the role of a woman in society has significantly changed during recent decades. Today the importance of women in the society is beyond any suspicion. In today’s world, women with their ambitions, intelligence and strength have proved that the word “inferior” has nothing in common with their gender.  
1. Which best serves as the title for the passage?

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Most languages have several levels of vocabulary that may be used by the same speakers. In English, at least three have been identified and described. Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered acceptable for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, refers to words and expressions understood by a large number of speakers but not accepted as appropriate formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both colloquial usage and slang are more common in speech than writing. Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expressions enjoy momentary popularity followed by obscurity. In some cases, the majority never accepts certain slang phrases but nevertheless retains them in their collective memories. Every generation seems to require its own set of words to describe familiar objects and events. It has been pointed out by a number of linguists that three cultural conditions are necessary for the creation of a large body of slang expressions. First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, association among the subgroups and the majority population. Finally, it is worth noting that the terms "standard", "colloquial", and "slang" exist only as abstract labels for scholars who study language. Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expressions. Most speakers of English will, during appropriate situations, select and use three types of expressions.
7. The word "them" in paragraph 3 refers to .

Choose the best answer:
___ believe that some of the happiest people in the world are those who help to bring happiness to others

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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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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?

Read the following passage and choose the best answer (A, B, C, D):
Most sexual assault and violence in schools is committed by people who know their victims — they’re either dating, friends, or classmates. Regardless, they have a relationship of some sort, which is why a focus on relationships and empathy is crucial to reducing violence and preparing students for more meaningful lives. And while it might seem uncomfortable to move beyond the cut-and-dried facts of contraception into the murkier waters of relationships, students are hungry for it. A survey by researchers at the Harvard Graduate School of Education’s Making Caring Common initiative found that 65 percent of young-adult respondents wished they had talked about relationships at school. “It’s so critical that kids are able to undertake this work of learning to love somebody else,” says developmental psychologist Richard Weissbourd, the director of Making Caring Common and lead author of a groundbreaking report called The Talk: How Adults Can Promote Young People’s Healthy Relationships and Prevent Misogyny and Sexual Harassment. “They’re not going to be able to do it unless we get them on the road and are willing to engage in thoughtful conversations.” Nicole Daley works with OneLove, a nonprofit focused on teen violence prevention. She previously worked extensively with Boston Public Schools on violence prevention. She echoes Weissbourd: A focus on relationships is key to keeping students safe. “If a young person is not in a healthy relationship, they can’t negotiate sex in a meaningful way,” she says. “Really discussing healthy relationships and building that foundation is important. Even if they’re not having sex yet, they’re grappling with the idea of what healthy relationship is.” And it’s critical to start that work before college.  
1. Which best serves as the title for the passage?