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

 Education is recognized as an essential need for achieving equal in most walks of life

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Population in the world is currently (2018) growing at a rate of around 1.09% per year (down from 1.12% in 2017 and 1.14% in 2016). The current average population increase is estimated (1)________83 million people per year Annual growth rate reached its (2)__________in the late 1960s, when it was at around 2%. The rate of increase has nearly halved since then, and will continue (3)_________in the coming years. It is estimated to reach 1% by 2023, less than 0.5% by 2052, and 0.25% in 2076 (a yearly addition of 27 million people to a population of 10.7 billion). In 2100, it should be only 0.09%, or an addition of only 10 million people to a total population of 11.2 billion. World population will therefore continue to grow in the 21st century, but at a much slower rate (4)___________to the recent past. World population has doubled (100% increase) in 40 years from 1959 (3 billion) to 1999 (6 billion). It is now estimated that it will (5)_________another nearly 40 years to increase by another 50% to become 9 billion by 2037

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There are many thoughts on the origins of civilization. One of the major factors  involved was the increase in population. The development of techniques, primarily irrigation and food control, which permitted agriculture in special areas such as the flood plain of the Tigris and Euphrates rivers, made possible the support of large population. Once populations reach a certain number, the older pattern of social organization breaks down and new ones develop. Specifically the older system whereby each individual participated in food production and maintained a similar standard of living, and whereby kinship served as the basic method of social organization, was replaced by the occupational division of labor, political and religious hierarchies, public works such as road and public building construction, class systems, codes of law, markets, new forms of warfare, and urban centres. Allied with these important sociological traits are material traits, such as monumental architecture and development of science and, in many cases, metallurgy and writing systems.  The earliest civilization, Sumer, developed in the Middle East. This was the Bronze Age of the Old World, during which people first developed the art of metallurgy, civilization also arose in other parts of the Old World first in Egypt, China and India, and later in Europe and Africa. At this time, civilization also developed independently in the New World, in the Mexican area and in Peru and its neighboring areas.  In the Old World the Bronze Age was followed by the Iron Age, which saw the rise and fall of great empires and the shift of power from the Middle East to Greece and Rome and then to Western Europe. In the 1700s the Industrial Age began, leading directly to the modern civilization of today. 
5. Which of the following is NOT included in the expression “the Old World” used in the passage?

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With exams approaching, you should be thinking about how to get better at time management and organize your days so you can strike the right balance between home, work and university life. You should also try and eat some brain food - and no, we don’t mean crisps and energy drinks! By taking the time to arrange your priorities, you can give yourself the best chance of staying on track and being organized during the exam period, which in turn can help reduce stress levels, something that can be the difference between success and failure at university. Take a look at our top time management tips, so that you can do your best at university and also find moments to relax and even earn some money on the side. First and foremost, allow time for planning to avoid repetition. Taking the time to research, plan and think about your work is crucial for good time management. Allow yourself the time to process new information and plan how you are going to use it, as this can help you to avoid having to re-read and repeat any research. One way of effectively planning before researching is to make a list of everything you want to find out, so that you can make notes below each subheading as you go Secondly, avoid procrastination and distraction. One way to avoid procrastination is to think about the different places you have been when studying - where were you the most focused? Where were you most distracted? Is there anything you can do to make studying actually somewhat enjoyable? Remember, what works for one person might not necessarily work for you. For some, studying with friends can limit their productivity. But for others, studying in groups can help to increase motivation and avoid procrastination. Next, exercise to clear your head in between study sessions. Believe it or not, exercise works in the same way sleep does. It can focus your state of mind, helping you to clear your head and boost your brain power in between study sessions. If you’re new to exercise, aim to fit in a 10-minute run here and there, steadily increasing the amount you do as you go on. Finally, ask yourself the question, “Has your organization been effective?” Constantly reviewing and reassessing your schedule can help you to recognize whether you need to make any changes in order to help you complete any university tasks and also have time to relax and spend time with friends and family.  
7. What benefit of exercise is NOT mentioned?

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The first two decades of this century were dominated by the microbe hunters. These hunters had tracked down one after another of the microbes responsible for the most dreaded scourges of many centuries: tuberculosis, cholera, diphtheria. But there remained some terrible diseases for which no microbe could be incriminated: scurvy, pellagra, rickets, beriberi. Then it was discovered that these diseases were caused by the lack of vitamins, a trace substance in the diet. The diseases could be prevented or cured by consuming foods that contained the vitamins. And so in the decades of the 1920’s and 1930’s, nutrition became a science and the vitamin hunters replaced the microbe hunters. In the 1940’s and 1950’s, biochemists strived to learn why each of the vitamins was essential for health. They discovered that key enzymes in metabolism depend on one or another of the vitamins as coenzymes to perform the chemistry that provides cells with energy for growth and function. Now, these enzyme hunters occupied center stage. You are aware that the enzyme hunters have been replaced by a new breed of hunters who are tracking genes – the blueprints for each of the enzymes – and are discovering the defective genes that cause inherited diseases – diabetes, cystic fibrosis. These gene hunters, or genetic engineers, use recombinant DNA technology to identify and clone genes and introduce them into bacterial cells and plants to create factories for the massive production of hormones and vaccines for medicine and for better crops for agriculture. Biotechnology has become a multibilliondollar industry. In view of the inexorable progress in science, we can expect that the gene hunters will be replaced in the spotlight. When and by whom? Which kind of hunter will dominate the scene in the last decade of our waning century and in the early decades of the next? I wonder whether the hunters who will occupy the spotlight will be neurobiologists who apply the techniques of the enzyme and gene hunters to the funtions of the brain. What to call them? The head hunters. I will return to them later.
2. The word “incriminated’ in the first paragraph is closest in meaning to: 

Rewrite the sentence:
It was very kind of you to send me the postcard.

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:
Four West Indian geckos, with human assistance, have recently entered the United States. The yellowheaded gecko, the ashy gecko, the reef gecko, and the ocellated gecko are presently inhabiting the tropical areas of the Keys and the tip of southern Florida. The Mediterranean gecko also arrived along the Gulf coast some time ago, via the West Indies. The only other geckos in the United States live in the Southwest. In extreme southern California, the leaf-gingered gecko lives

in dry, rocky country and scampers over boulders at night, hiding by day in crevices. It has a slender, tapered tail and stalks insects by raising itself high on its legs, cocking its head, and twitching its tail nervously before leaping on its prey. In courtship, the tail is also waved by the male as he approaches the female.
Although most lizards are excellent climbers, the geckos are able to walk on smooth surfaces with the help of unique clinging devices under the toes. Also, the undersides of most geckos have pads of large scales, each of which bear microscopic hairs with hundreds of branches having minute, blunt ends that press against the surface that the gecko is on, enabling the gecko to cling to almost any surface. Like other lizards, geckos have the ability to shed their tails if attacked by an enemy. They stump heels and a new tail is grown in approximately the same shape as the original. Unlike most lizards, most geckos have no moveable eyelids. The nocturnal geckos have vertical pupils, which contract in bright light. All geckos, except several New Zealand species, lay eggs. The eggs have a tough, white shell and are laid under stones, behind window shutters or under bark.

In line 1, the author uses the words “human assistance” to mean .

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:
It is many peoples dream to become a world-famous artist. Unfortunately, it can be extremely difficult to make a living solely from selling your paintings or sculptures. But don’t worry because there are other jobs in the world of art that you can pursue. One possible career option is to become an art dealer.
An art dealer works on behalf of artists to help them sell works to museums and galleries around the world. To be successful at this profession, it requires a well-rounded skill set. For starters, it helps a lot if you love art and are knowledgeable about art history. Having business skills will also be quite useful, as it will be necessary to negotiate with buyers, and help the artists you represent market their work. If becoming an art dealer sounds appealing, there are several steps which you can follow. Although you  may have a love for a wide range of styles, you should start by choosing one category to focus on. Buyers usually prefer to deal with a specialist in a particular area than someone who is a jack of all trades. When selecting your focus, choose an area that you are passionate about instead of something that seems lucrative. Art trends come and go, so there is no use trying to predict what is hot. These trends will certainly change over the course of your career.
Once you selected an area to focus on, start to contact some museums, galleries, and other companies in the art world and send them your resume. The majority of art dealers begin their careers working as interns for these kinds of companies. Although these interns may be paid little, or in some cases nothing at all, the experience of learning how art businesses work will certainly serve you down the road.
It pays to be flexible in the beginning, as the most important thing is to get your foot in the door. Museums and galleries may offer you several positions including a sales assistant or a junior art consultant. Whichever job you accept, be sure to learn it well and give it your best. In addition to your responsibilities, make sure your start to network with others in your industry. As your knowledge and contacts begin to grow, more opportunities will be open to you.

The best quality of an art dealer to start the career may be     .

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Being part of a community with long history rooted in agriculture, Vietnamese people  especially those from older generations hold a strong belief for superstition about luck and bad luck. Even though people have become much less superstitious as they were before, some traditions still (1) ____ on until today like people’s habit. Let’s take a closer look at some common food-related superstitions and explore the reasoning behind them.  Regarding what food to avoid before taking an important examination, homophones and the shape of your food comes into (2) ____. These features are the criteria that people use to decide which food is good and what is bad to eat before an important examination. Students are restrained from eating bananas prior to an exam for (3) ____ of failing ‘like sliding on a banana skin’  They are also advised eating squid, which when disturbed, emit a substance that is ‘as black as ink’. The phrase carries the connotation of a black (bad) mark on your test. Eating squash, pumpkin, melon and peanuts was also a (4) ____. The words for pumpkin and melon in Vietnamese mean “stuck” and the word for peanut means to be ‘lost’ or ‘digress’. Duck meat and eggs are associated with bad luck since the shape of an egg resembles the zero number. On the (5) ____, eating any type of beans is considered good before an exam since bean in Vietnamese means the same thing with to ‘pass a test

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Hardly a week goes by without some advance in technology that would have seemed  incredible 50 years ago. And we can expect the rate of change to accelerate rather than slow down within our lifetime. The developments in technology are bound to have a dramatic effect on the future of work. By 2010, new technology will have revolutionized communications. People will be transmitting messages down telephone lines that previously would have been sent by post. Not only postmen but also clerks and secretaries will vanish in a paper-free society. All the routine tasks they perform. will be carried on a tiny silicon chip so that they will be as obsolete as the horse and cart after the invention of the motor car. one change will make thousands, if not millions, redundant.  Even people in traditional professions, where expert knowledge has been the key, are unlikely to escape the effects of new technology. Instead of going to a solicitor, you might go to a computer which is programmed with all the most up-to-date legal information. Doctors, too, will find that an electronic competitor will be able to carry out a much quicker and more accurate diagnosis and recommend more efficient courses of treatment. In education, teachers will be largely replaced by teaching machines far more knowledgeable than any human being. Most learning will take place in the home via video conferencing. Children will still go to school though, until another place is created where they can make friends and develop social skills.  What can we do to avoid the threat of unemployment? We shouldn’t hide our heads in the sand. Unions will try to stop change but they will be fighting a losing battle. People should get computer literate as this just might save them from professional extinction. After all, there will be a few jobs left in law, education and medicine for those few individuals who are capable of writing and programming the software of the future. Strangely enough, there will still be jobs like rubbish collection and cleaning as it is tough to programme tasks which are largely unpredictable.
8. Which of the following is true, according to the passage?

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I am sorry that I can't ________ your invitation.

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Russia offers to establish an organization with the participation of Russia, the US, EU  states and other countries in order to resolve the issues in the Persian Gulf, Russian President Vladimir Putin stressed on Thursday during the plenary session of the Valdai Discussion Club.  "I would like to remind you that following this logic, Russia has come up with the concept of ensuring collective security in the Persian Gulf in July of this year. I think that taking into account the volatile and unpredictable situation in the region, the idea remains topical. We offer to put aside our differences and mutual claims and to establish an organization for security and cooperation in the region basically from scratch, which would include the Gulf States and which could involve Russia, China, the US, the EU, India and other interested states as observers," he said.  On July 23, the Russian Foreign Ministry introduced a concept of collective security in the Persian Gulf region. The concept includes forming an initiative group to organize an international conference on security and cooperation in the Persian Gulf area, which would lead to the establishment of an organization for security and cooperation in the region. Besides, Moscow offered to establish demilitarized zones in the region, abandon permanent deployment of units of non-regional states and establish military hotlines. Earlier, during a joint press conference on the outcomes of the talks with Russian Foreign Minister Sergey Lavrov, Iranian top diplomat Mohammad Javad Zarif welcomed the Russian initiative. He added that Iran offers to create a coalition on security in the Persian Gulf, including Iraq, Saudi Arabia, Bahrain, the United Arab Emirates, Qatar, Oman and Kuwait under the auspices of the UN. 
5. The word “auspices” in paragraph 3 is closest in meaning to ______

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Stonehenge, the prehistoric stone circle in southern England, is one of the most distinctive and mysterious monuments in the world. The monument, which attracted more than one and a half million visitors last year, is thought to be up to 5,000 years old, and the heaviest stone weighs 38 tons. No one really knows how the stones got there, or the reason they look the way they do – but a piece removed from one of the stones six decades ago could bring some answers. At first glance, the new “discovery” - a cylinder of rock - might look unremarkable. But for Lewis and Robin Phillips, it meant one thing: their dad, Robert. In 1958, Robert Phillips worked on a major restoration project commissioned by the British government. The goal was to make the monument safer, and help historians better understand what Stonehenge was and why it was there. The team drilled through the largest of the sarsen rocks, removing three stone cores. Robert Phillips was gifted one as a souvenir. At the time, the core sample was considered to be “waste material,” Lewis said. “I think that the standards of the day, in conservation, were a bit different to what they are now,” Robert added. Six decades later, Robert - who’s now in his 90s - asked his sons to return the “waste material.” But what had become a family heirloom for the Phillips’ was “the Holy Grail” of Stonehenge for geologists, according to Susan Greaney, an archaeologist at English Heritage. “When the Phillips family first got in touch with us, we had no idea that this existed,” Greaney said. “We’d just assumed that they’d been thrown away.” In 1958, samples like this couldn’t provide much information - but now, Greaney added, it can help archaeologists understand where the stones were from and how they were transported. It could even provide clues to one of the biggest questions: why move all these rocks to one location? Right now, “we don’t know” is the answer to that, Greaney said. "We think this is a prehistoric temple. It’s aligned with the movements of the sun, so we think it’s some kind of ceremonial space. But exactly what the stones mean, why they built them in this way and set them up in the way we see today, there are lots of mysteries about Stonehenge that we have yet to get to the bottom of. 
8. Which of the following can be inferred from the passage?

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The climate crisis is poised to deliver a severe blow to America’s most threatened animals, with a new study finding that almost every species considered endangered is vulnerable in some way to global heating. Of the 459 animal species listed as endangered by the US government, researchers found that all but one, or 99.8%, have characteristics that will make it difficult for them to adapt to rising temperatures. The California condor, once close to being completely wiped out, faces increased risk of contamination in hotter conditions. Key deer, found only in the Florida Keys, face losing habitat to the rising seas. Whole classes of animals including amphibians, mollusks and arthropods are sensitive to the greatest number of climate-related threats, such as changes in water quality, shifting seasons and harmful invasive species that move in as temperatures climb. Mammals, such as the north Atlantic right whale and Florida panther, also face increased hardships, albeit on fewer fronts than amphibians, mollusks and arthropods.  Despite the overwhelming peril faced by America’s endangered species due to the climate crisis, the report, published in Nature Climate Change, found a patchy response from the US government. Federal agencies consider just 64% of endangered species to be threatened by the climate crisis, while just 18% of listed species have protection plans in place. Astrid Caldas, a study co-author and a climate scientist at the Union of Concerned Scientists said: “While agencies have increasingly listed climate change as a growing threat to species whose survival is already precarious, many have not translated this concern into tangible actions, meaning a significant protection gap still exists.” Nearly half of Australian species are threatened by the climate crisis, researchers have found. A spokesman for the US Fish and Wildlife Service, which oversees the endangered species list, said that while a species may be sensitive to changes in the climate, this sensitivity may not be so severe as to warrant being put on the list. “Our process for determining this looks at five factors: threats to a species’ habitat, overutilization, disease or predation, existing regulatory mechanisms, and other factors that may affect its continued existence,” he said. “Through this scientifically rigorous process we examine and account for the effects of climate change.  
2. The word “poised” in paragraph 1 is closest in meaning to _______.

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Next time your boss asks you to work late and miss your band rehearsal or board game night, point them to a new study in the Journal of Vocational Behavior. Researchers have found that spending more time on a hobby can boost people’s confidence in their ability to perform their job well. Ciara Kelly at Sheffield University and colleagues recruited 129 hobbyists — from amateur climbers to improv comedians — to look at how the time spent on their hobbies shaped their work life. To begin with, the team measured the seriousness of each participant’s hobby, asking them to rate their agreement with statements like “I regularly train for this activity”, and also assessed how similar the demands of their job and hobby were. Then, each month for seven months, participants recorded how many hours they had dedicated to their activity, and completed a scale measuring their belief in their ability to effectively do their job, or their “self-efficacy”, in which they rated themselves on statements like “At work I am able to successfully overcome many challenges”.  The researchers found that when participants spent longer than normal doing their leisure activity, their belief in their ability to perform their job increased. But this was only the case when they had a serious hobby that was dissimilar to their job, or when their hobby was similar to their work but they only did it casually. When their hobby was both serious and similar to their job, then spending more time on it actually had a detrimental effect, decreasing their self-efficacy. Why might that be? To maintain a serious hobby, people need to invest significant psychological resources, so if the activity has the same kinds of demands as their work, they may be left drained and unable to perform as well at their job. But if their hobby is quite different from their career, it may not interfere in the same way but instead help them develop other knowledge and skills that can boost their confidence at work. Of course, the data don’t provide conclusive evidence about the direction of the effect. Still, the results suggest that companies may want to encourage employees to pursue interests outside of work, as long as those activities differ from their day-to-day tasks. And they also may give pause to those who dream of packing it all in and turning their hobby into a career.  
6. Which of the following statements is TRUE, according to the passage?

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The leopard is _________ the threat of extinction.

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During droughts water is scarce but is it possible to make it rain to provide water. Experiments in cloud seeding suggest that it may be possible to artificially create rainfall. Rainfall occurs when supercooled droplets of water – those that are still liquid but are at a temperature below the usual freezing point of zero centigrade – form ice crystals. Now too heavy to remain suspended in the air, these then fall, often melting on their way down to form rain. Even in dry areas the air usually contains some water. This can be made to come together and form ice crystals by seeding the atmosphere with chemicals such as silver iodide or dry ice. They work to promote rainfall by inducing nucleation – what little water is in the air condenses around the newly introduced particles and crystallises to form ice. The ‘seeds’ can be delivered by plane or simply by spraying from the ground. But does it work? It’s hard to tell for sure. As is often the case with weather and climate, it’s impossible to carry out a controlled experiment – so, in areas of increased precipitation, we can’t know whether it would still have rained even if the clouds hadn’t been seeded. Success has been claimed for trials in Australia, France, Spain and the US. In the United Arab Emirates, the technique is credited with the creation of 52 storms in the Abu Dhabi desert, while China boasts of having used the technology in reverse to keep the Beijing Olympic Games of 2008 dry. Recent research, however, suggests that it’s not as effective as was previously believed  
1. Which best serves as the title for the passage?

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Advances in mobile technology and social networking websites mean we spend more time online than ever before. If Facebook were a country, it would be the third largest in the world by population (The Economist, 2010). It is (1) ______ not surprising that so many psychologists, sociologists, and others are eager to give their thoughts on how this is impacting negatively on our society. The biggest criticism levelled at social networking is that young people are losing their offline friends to online friends (2) ______ are unable to provide the same deep connection and emotional support. However, a lot of research shows these criticisms are generally (3) ______. Allen et al. (2010) discovered that it is socially adjusted adolescents who are more likely to have a networking profile than those who are not. One study by the Pew Internet and American Life Project (2009) found that people are not (4) ______ offline friends with online companions but are using them to support their offline relationships. The study also found that social networks allow us to have discussions with a much more diverse set of people than in the real world, so we share knowledge with people from a wide (4) ______ of backgrounds

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Hamams, or bath houses, are a traditional part of Turkish culture. They represent an important piece of Turkey’s long history and serve as a window into the past. However, these bath houses are quickly disappearing because of the changing habits of the Turkish people. Hamams hold a strong place in the history of Turkey and many date back hundreds of years. Traditionally, all kinds of people went to hamams because Islam has strict laws for cleanliness. Believers must wash themselves regularly, particularly before their daily prayers. As most people in Turkey didn’t have access to running water in their homes, the hamam was the perfect to get clean, relax, and catch up with friends. Today, however, the tradition of going to the humam is quickly dying out for many young people. Now almost everyone has running water in their bathrooms, so they prefer to bathe at home. As a result, Turkish people are not going to humans as often as they used to. These days, instead of relying on locals, many hamams are trying to attract foreign tourists. Some of the best hamams in Turkey are located in Istanbul, the country’s largest city. The Cagaloglu hamam is a great example. It was a gift to the people from the Sultan in 1741 and is one of the last old hamams to be built during the Ottoman Empire. Many visitors are impressed by the high domed ceilings, marble floors, and marble walls used throughout. A typical session at a hamam can last well over an hour. Visitors will be welcomed into camekan, or entrance hall. There they will be able to relax with friends and chat over a cup of tea. They will also be able to change into the customary pestemal, or Turkish towel, which wraps around the waist like a skirt. When ready, visitors will head into the hararet, or hot room. There they will lie on the hot floor and be scrubbed clean and massaged by one of the in-house masseurs or masseuses. Men and women always bathe separately, but their experience are very similar. Although many hamams are in danger of closing, they will always remain a part of Turkish culture. An experience in one of Istanbul’s famous bath houses is not to be misses on any visit to Turkey. It will certainly leave you refreshed, relaxed, and squeaky clean for your next adventure
4. According to the passage, why were humams important places for Islamic people?

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In 2018 the Tchaikovsky Competition celebrated its 60th anniversary. While many things have changed in the country, in the world and in the people, the art of music has been showing its amazing vital power helping the performing art go through difficult times and contributing to its amazing ability to revive. It appears that the history of the Tchaikovsky Competition can be divided into three periods which in the terms of a well-known critic can be defined as the rise, the soaring and the descent. The rise refers to the first three Competitions (1958, 1962 and 1966) when the structure of the Competition was formed (the First Competition comprised two categories, the Second – three and the Third – four categories). The competition jury was a pool of renowned cultural figures. Under the special focus were the amazingly talented competitors and they exceeded all expectations. The winner of the piano contest of the I Competition became Van Cliburn, a US piano player who just after finishing his first program items became the object of admiration and a legend that was passed down in Russia and America for generations. His impressive performance was something that couldn’t be judged only from the professional point of view; our listener’s perception was almost irrational. Also, for long we remembered by names the other piano players taking part in the I Competition. Truly, Toyoaki Matsuura and Daniel  Pollack were brilliant virtuosos, if not genius. Besides, both Daniel Pollack and Van Cliburn studied under Rosina Levina, a famous Russian educator, i.e. they were kindred spirits for Russians. What was happening gave an impression of something truly exceptional and unmatched, and this was proved to be true during the many years of the Tchaikovsky Competition in the future. The II Competition was also truly amazing. In the piano category won Vladimir Ashkenazi, the Soviet virtuoso piano player, and an eccentric Englishman John Ogdon. In the violin contest the winner was Leningrad native Boris Gutnikov who had won all the competitions in which he had participated. At the III Competition there was a sensation: a Leningrad native 16-year-old Grigory Sokolov while not being considered by the critics as the most likely winner won the first prize in the piano contest; his charmingly fresh musicality and magical pianism turned the jury’s opinion in his favor despite the dissatisfaction of the Moscow audience over the jury’s choice.  
5. According to paragraph 3, which statement is NOT correct about the people’s relationship?

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The word noise is derived from the Latin word nausea, meaning “seasickness”. Noise is among the most pervasive pollutants today. Noise pollution can broadly be defined as unwanted or offensive sounds that unreasonably intrude into our daily activities. Noises from traffic, jet engines, barking dogs, garbage trucks, construction equipment, factories, lawn mowers, leaf blowers, televisions, boom boxes and car radios, to name a few, are among the audible litter that is routinely broadcast into the air. One measure of pollution is the danger it poses to health. Noise negatively affects human health and well-being. Problems related to noise include hearing loss, stress, high blood pressure, sleeplessness, fright, distraction, and lost productivity. Noise pollution also contributes to a general reduction in the quality of life and eliminates opportunities for tranquility. We experience noise in a number of ways. On some occasions, we can be both the cause and the victim of noise, such as when we are operating noisy appliances or equipment. There are also instances when we experience noise generated by others, just as people experience secondhand smoke. In both instances, noise is equally damaging physically. Secondhand noise is generally more troubling, however, because it is put into the environment by others, without our consent. The air into which secondhand noise is emitted and on which it travels is “a commons”. It belongs not to an individual person or a group, but to everyone. Please, businesses and organizations, therefore, do not have unlimited rights to broadcast noise the as they please, as if the effects of noise were limited only to their private property. Those that disregard the obligation to not interfere with other’ use and enjoyment of the commons by producing noise pollution are, in many ways, acting like a bully in a schoolyard. Although they may do so unknowingly, they disregard the rights of others and claim for themselves rights that are not theirs. The actual loudness of a sound is only one component of the negative effect noise pollution has on human beings. Other factors that have to be considered are the time and place, the duration, the source of the sound, and even the mood of the affected person. Most people would not be bothered by the sound of a 21-gun salute on a special occasion. On the other hand, the thump-thump of music coming from the apartment downstairs at 2a.m, even if barely audible, might be a major source of stress. The sound of neighbor’s lawn mower may be unobjectionable on a summer afternoon, but if someone is hoping to sleep late on a Saturday morning, the sound of a lawn mower starting up just after sunrise is an irritant  
2. The author explains the concept of interfering with others’ use and enjoyment of a common by ______.