语法与词汇Your father is (furious) about the damage you have done to the flower beds.

语法与词汇Glassmaking was the first (major) industry in the United States.

语法与词汇I feel obligated to give my opinion on the subject.

语法与词汇Three straight lines meeting at three points (constitute) a triangle.

语法与词汇The city has decided to do away with all the old buildings in its center.

填空题 Ford1 Ford's great strength was the manufacturing process—not invention. Long before he started a car company, he was a worker, known for picking up pieces of metal and wire and turning them into machines. He started putting cars together in 1891. Although it was by no means the first popular automobile, the Model T showed the world just how creative Ford was at combining technology and market.2 The company's assembly line alone threw America's Industrial Revolution into overdrive (高速运转). Instead of having workers put together the entire car, Ford's friends, who were great toolmakers from Scotland, organized teams that added parts to each Model T as it moved down a line. By the time Ford's Highland Park plant was humming (嗡嗡作响) along in 1914, the world's first automatic conveyor belt could turn out a car every 93 minutes.3 The same year Henry Ford shocked the world with the $5-a-day minimum wage scheme, the greatest contribution he had ever made. The average wage in the auto industry then was $2.34 for e 9-hour shift. Ford not only doubled that, he also took an hour off the Workday. In. those years it was unthinkable that a man could be paid that much for doing something that didn't involve an awful lot of training or education. The Wall Street Journal called the plan "an economic crime", and critics everywhere laughed at Ford.4 But as the wage increased later to daily $10, it proved a critical component of Ford's dream to make the automobile accessible (可及的) to all. The critics were too stupid to understand that because Ford had lowered his costs per car, the higher wages didn't matter—except for making it possible for more people to buy cars.

填空题Communication Principles How you see yourself can make a great difference in how you communicate. "Every individual exists in a continually changing world of experience of which he (or she) is the center." Many communication scholars and social scientists believe that people are products of how others treat them and of the messages others send them. But every day we experience the centrality of our selves in communication. A student, for instance, may describe a conflict with a teacher as unfair treatment: "I know my teacher doesn"t like the fact that I don"t agree with his opinions, and that"s why he gave me such a poor grade in that class." The teacher might say the opposite. Each person may believe that he is correct and that the other person"s view is wrong. The concept of self originates in communication. Through verbal and nonverbal symbols, a child learns to accept roles in response to the expectations of others. You establish self-image, the sort of person you believe you are, by how others think of you. Positive, negative, and neutral messages that you receive from others all play a role in determining who you are. Communication itself is probably best understood as a dialogue process. Our understanding of communication comes from our interactions with other people. In a more obvious way, communication involves others in the sense that a competent communicator considers what the other person needs and expects when selecting messages to share. So, the communication begins with the self, as defined largely by others, and involves others, as defined largely by the self. Communication occurs almost every minute of your life. If you are not communicating with yourself (thinking, planning, reacting to the world around you), you are observing others and drawing inferences from their behaviour. Even if the other person did not intend a message for you, you gather observations and draw specific conclusions. A person yawns and you believe that person is bored with your message. A second person looks away from you and you conclude that person is not listening to you. A third person smiles (perhaps because of a memory of a joke he heard recently) and you believe that he is attracted to you. We are continually picking up meanings from others" behaviors and we are constantly providing behaviors that have communicative value for them. More often than not, you may have hurt someone accidentally and you may have tried to explain that you did not mean that. You may have told the other person that you were sorry for your statement. You may have made a joke out of your rude statement. Nonetheless, your comment remains both in the mind of the other person and in your own mind. You cannot go back in time and erase your messages to others. When you tried to re-create the atmosphere, the conversation, and the setting, nothing seemed right. Your second experience with a similar setting and person made far different results. Anyway, communication cannot be reversed (倒退), nor can it be repeated.

填空题阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。 Women's Rights Movement 1 Women's rights are guarantees of political, social, and economic equality for women in a society that traditionally gives more power and freedom to men. Among these rights are control of property, equality of opportunity in education and employment, right of voting, and freedom of marriage. Today, complete political, economic, and social equality with men remains to be achieved. 2 Male control was obvious from the time of the earliest written historical records, probably as a result of men's role in hunting and warfare. The belief that women were naturally weaker and inferior to men was also found in god-centered religions. Therefore, in most traditional societies, women generally were at a disadvantage. Their education was limited to learning domestic skills, and they had no access to positions of power. A woman had no legal control over her person, her own land and money, or her children. 3 The Age of Enlightenment and the Industrial Revolution, which caused economic and social progress, provided a favorable climate for the rise of women's rights movement in the late 18th and 19th century. In 1848 more than 100 persons held the first women's rights convention in New York, and the feminists demanded equal rights, including the vote. 4 In the late 1960s women made up about 40 percent of the work force in England, France, Germany, and the United States. This figure rose to more than 50 percent by the mid-1981s. A commission under the President was established in 1960 to consider equal opportunities for women. Acts of Congress entitled them to equality in education, employment, and legal rights. In 1964 the Civil Rights Act, initially intended only for blacks was extended to women. 5 The objectives of the women's movement included equal pay for equal work, federal support for day-care centers, recognition of lesbian(女性同性恋) rights, making abortion legal, and the focus of serious attention on the problems of forced sex relations, wife and child beating, and discrimination against older and minority women. A) Goals B) History of Women's Rights Movement C) Start of Women's Rights Movement D) Traditional Status of Women E) Rights of Women F) Development

填空题The First Four Minutes When do people decide whether or not they want to become friends? During their frst four minutes together, according to a book by Dr. Leonard Zunin. In his book, "Contact: The first four minutes," he offers this advice to anyone interested in starting new friendships: (46) . A lot of people's whole lives would change if they did just that. You may have noticed that average person does not give his undivided attention to someone he as just met. (47) . If anyone has ever clone this to you, you probably did not like him very much. When we are introduced to new people, the author suggests, we should try to appear friendly and self-eonfident. In general, he says," People like people who like themselves. " On the other hand, we should not make the other person think we are too sure of ourselves. It is important to appear interested and sympathetic, realizing that the other person has his own needs, fears, and hopes. Hearing such advice, one might say, "But I'm not a friendly, self-confident person. That's not my nature. It would be dishonest for me to at that way. " (48) . We can become accustomed to any ehanges we choose to make in our personality. "It is like getting used to a new car. It may be unfamiliar at first, but it goes much better than the old one. " But isn't it dishonest to give the appearance of friendly self-confidence when we don't aetually feel that way? Perhaps, but aceording to Dr. Zunin, "total honest" is not always good for social relationships, especially during the first few minutes of contact. There is a time for everything, and a certain amount of play-acting may be best for the first few minutes of eontaet with a stranger. That is not the time to complain about one's health or to mention faults one finds in other people. It is not the time to tell the whole truth about one's opinions and impressions. (49) . For a husband and wife or a parent and child, problems often arise during their first four minutes together after they have been apart. Dr. Zunin suggests that these first few minutes together be treated with care. If there are unpleasant matters to be discussed, they should be dealt with later. The author says that interpersonal relations should be taught as a required course in every school, along with reading, writing, and mathematics. (50) . That is at least as important as how much we know.A. In reply, Dr. Zunin would elaim that a little praetiee can help us feel comfortable about changing our social habits.B. Much of what has been said about strangers also applies to relationships with family members and friends.C. In his opinion, success in life depends mainly on how we get along with other people.D. Every time you meet someone in a social situation, give him your undivided attention for four minutes.E. He keeps looking over the other person's shoulder, as if hoping to find someone more interesting in another part of the room.F. He is eager to make friends with everyon

填空题Caribbean Islands What would you see if you took a cruise to the Caribbean Islands? Palm trees and coconuts (椰子)? White beaches and clear, blue ocean? Colorful corals (珊瑚) and even more colorful fishes and birds? You bet. There are thousands of islands in the Caribbean Sea. They are famous for their warm, tropical climate and great natural beauty. The Caribbean Islands form a chain that separates the Caribbean Sea from the rest of the Atlantic Ocean. 1 Many of the islands were formed by the eruption (爆发) of ancient volcanoes (火山). Others are low-lying coral islands that gradually rose from the ocean. The Caribbean Islands are known by several names. 2 The explorer Christopher Columbus called the islands the Indies in 1492 because he thought he was near the coast of India. Later, Spain and France called the islands the Antilles. There are four large islands in the Caribbean Sea. 3 These four islands are often called the Greater Antilles. Together, they account for about 90 percent of the land area of the Caribbean Islands. The rest of the Caribbean Islands are much smaller. 4 You can see why pirates such as the famous Blackbeard sailed these waters. There are countless small islands to bury treasure or hide on. The weather of the Caribbean Sea is almost always warm and sunny. Sandy beaches line the coasts of many islands. 5 Many tourists arrive on cruise ships. A. But life on the Caribbean Islands is not always paradise. B. The earliest name used by Europeans is the Indies, later changed to the West Indies. C. They"re like a long necklace that stretches between North and South America. D. They are Cuba, Puerto Rico, Jamaica, and Hispaniola. E. This is why millions of tourists visit the islands each year. F. Some of these islands are no more than tiny slivers (小片) of exposed coral.

填空题US Signs Global Tobacco Treaty The United States has taken the first step toward approving a global tobacco treaty that promises to help control the deadly effects of tobacco use throughout the world. Health and Human Services Secretary Tommy Thompson signed the Framework Convention on Tobacco Control (FCTC) this week at the United Nations. 1 The FCTC was developed by the World Health Organization and approved by members of the World Health Assembly, including the United States, last year. 2 For instance, cigarettes sold in those countries would have to have health warnings on at least 30% of the front and back of every pack. 3 It also requires bans on tobacco advertising, though there are some exceptions for countries like the United States, where the Constitution prohibits such an outright ban. 4 The World Health Organization estimates that tobacco use kills nearly 5 million people worldwide every year. In the US alone, about 440,000 people die each year from tobacco-related illnesses; about one-third of all cancers in the US are caused by tobacco use. If current trends continue, WHO estimates, by 2025 tobacco will kill 10 million people each year. The treaty must be ratified by at least 40 countries before it can take effect. 5 A. The impact of the treaty could be huge. B. Countries that ratify (批准) it would be required to enact strict tobacco control policies. C. The treaty calls for higher tobacco taxes, restrictions on smoking in public places, and more promotion of tobacco prevention and cessation programs. D. So far, 109 countries have signed it, and 12 have ratified it. E. The Senate must still approve the treaty before the US can implement its provisions. F. Tobacco stocks also perked up as investors discounted fears of litigation (诉讼) from the US.

填空题Are You a Successful Leader? 1. Almost nothing we do in this world is done in isolation. At work or at play, you will I find yourself in groups, working with other people: your team at work, a meeting with colleagues, your family, a holiday with friends, a group of students working together, a day out walking in the mountains, a group of neigbhours wanting to make changes. It is now recognised that being able to work successfully with other people is one of the major keys to success, partly because we need to do it so often. 2. In almost every situation where you're in a group, you will need a skilled leader. All groups need leaders and all successful groups have good leaders. Groups without leaders or with weak leaders almost always break down. Members of a leaderless group often begin to feel dissatisfied and frustrated. Time is wasted and the tasks are not achieved. There are often arguments and tensions between people as there is nobody to keep the goals clear. Some personalities dominate and others disappear. Often group members begin not to come to meetings in order to avoid more disharmony. 3. Some people are natural leaders. The celebrity chef, Antonio Carluccio says, "True leaders are born and you can spot them in kitchens. "They' re people who combine toughness, fairness and humour. Although a lot of people agree that there are some natural-born leaders, most people now recognise that leadership can also be taught. Our professional and experienced staff can train almost anyone how to be a successful leader. Good leaders don't make people do things in a bossy, controlling way. You can learn how to involve everyone, encouraging the whole group to work towards a common goal. 4. Our training courses use activities and techniques to develop a range of qualities which are necessary to be a good leader. Self confidence is vital for you to overcome your own fears about being a leader. Successful leaders also need to be calm and intelligent. They need to be able to work out good strategies and make sound judgements under pressure. Lastly, and probably most importantly, good leaders need to be sensitive, sociable and be able to get on with a wide range of people. Good leadership is essentially the ability to influence others and good leaders allow all members of the group to contribute.A. Most of good leaders are natural-born.B. It's important to have a good leader.C. People are in groups.D. These techniques are used to train leaders.E. Training can make good leaders.F. A good leader needs a variety of qualities.

填空题 Animal Intelligence Are Animals intelligent? If they are, which animals are the most intelligent? These are not easy questions to answer. In the first place, no one is quite sure what intelligence is. We often say that intelligence means being able to solve problems. (46) . For example, dogs and cats often find their way home from long distances. To do this they have to use their intelligence. They have to remember and think. But many birds find their way over long distances, too. They travel thousands of miles every year when they move from cool to warmer places. We do not know how they do this but we know that they do not use their intelligence. (47) . Young birds are able to make these journeys without help as soon as they can fly. They are born with this ability. This is not intelligence. We call this 'instinct'. Often we cannot be sure whether an animal is acting intelligently or instinctively. When a dog hears a strange noise, it barks. This is instinct. It cannot stop itself from doing this. It does not really know why it is doing this. But supposing a house is on fire and the dog barks outside its master's bedroom until he wakes up, is the dog using its intelligence? (48) . Often we cannot be sure. Many animals, however, can be taught to sole problems, especially when they are given rewards. Rats have been taught to press a lever to get food. Pigeons have been taught to peck a disc for the same reason. Even an octopus(章鱼) has been trained to know the difference between a square and an oblong (长方形) ! Animals in circuses have been taught to do all sorts of tricks to amuse an audience. (49) . It is saying, "if I do this, I will get a reward. Therefore I will do it. " This may be thought of as a low kind of intelligence. Some animals, however, show a much higher kind of intelligence. They solve problems without any help. Chimpanzees, one of the ape family, are much more intelligent than other animals. A chimpanzee once did something even more intelligent. He did not have a stick. He had two short tubes. Neither of the tubes was long enough to reach the banana but one was wider than the other. He jammed the narrow tube inside the wider tube and in this way made one tube long enough to reach the banana (50) . A．Is it solving the problem by waking its master or is it simply barking instinctively because it is afraid? B．Chimpanzees can solve certain problems without any help. C．Some animals seem able to do this. D．In all these cases we may say that an animal is using intelligence. E．In other words, he did not simply use a tool, which itself is intelligent: he made a tool. F．They do not remember places and directions and then make decisions.

填空题下面的短文后有2项测试任务：(1)第23～30题要求从所给的6个选项中为第1～5段各其中4段选择1个最佳标题；(2)第 27～30题要求从所给的4个选项中为每个句子确定1个最佳选项。 Transport and Trade 1. Transport is one of the aids to trade. By moving goods from places where they are plentiful to places where they are scarce, transport adds to their value. The more easily goods can be brought over the distance that separates producer and consumer, the better for trade. When there were no railways, no good roads, no canals, and only small sailing ships, trade was on a small scale. 2. The great advances made in transport during the last two hundred years were accompanied by a big in crease in trade. Bigger and faster ships enabled a trade in meat to develop between Britain and New Zealand, for instance. Quicker transport makes possible mass-production and big business, drawing supplies from, and selling goods to, all parts of the global. Big factories could not exist without transport to carry the large number of workers they need to and from their homes. Big city stores could not have developed unless customers could travel easily from the suburbs and goods delivered to their homes. Big cities could not survive unless food could be brought from a distance. 3. Transport also prevents waste. Much of the fish landed at the ports would be wasted if it could not be taken quickly to inland towns. Transport has given us a much greater variety of foods and goods since we no longer have to live on what is produced locally, Foods, which at one time could be obtained (获得) only during a part of the year, can now be obtained all through the year. Transport has raised the standard of living. 4. By moving fuel, raw materials, and even power, as, for example, through electric cables, transport has led to the establishment of industries and trade in areas where they would have been impossible before. Districts and countries can concentrate on making things which they can do better and more cheaply than others and can then exchange them with one another. The cheaper and quicker transport becomes, the longer the distance over which goods can profitably be carried. Countries with poor transport have a lower standard of living. 5. Commerce requires not only the moving of goods and people but also the carrying of messages and information. Means of communication, like telephones, cables and radio, send information about prices, supplies, and changing conditions in different parts of the world. In this way, advanced communication systems also help to develop trade. A. Higher Living Standard B. Importance of Transport in Trade C. Various Means of Transport D. Birth of Transport-related Industries and Trade E. Role of Information in Trade F. public Transportation

填空题Traffic Jams--No End in Sight 1. Traffic congestion (拥堵) affects people throughout the world. Traffic jams cause smog in dozens of cities across both the developed and developing world. In the U.S., commuters (通勤人员) spend an average of a full working week each year sitting in traffic jams, according to the Texas Transportation Institute. While alternative ways of getting around are available, most people still choose their cars because they are looking for convenience, comfort and privacy. 2. The most promising technique for reducing city traffic is called congestion pricing, whereby cities charge a toll to enter certain parts of town at certain times of day. In theory, if the toll is high enough, some drivers will cancel their trips or go by bus or train. And in practice it seems to work: Singapore, London and Stockholm have reduced traffic and pollution in city centres thanks to congestion pricing. 3. Another way to reduce rush-hour traffic is for employers to implement flextime, which lets employees travel to and from work at off-peak traffic times to avoid the rush hour. Those who have to travel during busy times can do their part by sharing cars. Employers can also allow more staff to telecommute (work from home) so as to keep more cars off the road altogether. 4. Some urban planners still believe that the best way to ease traffic congestion is to build more roads, especially roads that can take drivers around or over crowded city streets. But such techniques do not really keep cars off the road; they only accommodate more of them. 5. Other, more forward-thinking, planners know that more and more drivers and cars are taking to the roads every day, and they are unwilling to encourage more private automobiles when public transport is so much better both for people and the environment. For this reason, the American government has decided to spend some $7 billion on helping to increase capacity on public-transport systems and upgrade them with more efficient technologies. But environmentalists complain that such funding is tiny compared with the $50 billion being spent on roads and bridges. A. Not doing enough B. A global problem C. Changing work practice D. A solution which is no solution E. Paying to get in F. Closing city centres to traffic

填空题 Why Would They Falsely Confess? Why on earth would an innocent person falsely confess to committing a crime? To most people, it just doesn't seem logical. But it is logical, say experts, if you understand what could happen in a police interrogation (审讯) room. Under the right conditions, people's minds are susceptible (易受影响的) to influence, and the pressure put on suspects during police grilling (盘问) is enormous. {{U}} {{U}} 1 {{/U}} {{/U}}"The pressure is important to understand because otherwise it's impossible to understand why someone would say he did something he didn't do. The answer is to put an end to an uncomfortable situation that will continue until he does confess." Developmental psychologist Allison Redlich recently conducted a laboratory determine how likely people are to confess to things they didn't do. {{U}} {{U}} 2 {{/U}} {{/U}}The researchers then intentionally crashed the computers and accused the participants of hitting the "alt" key to see if they would sign a statement falsely taking responsibility. Redlich's findings clearly demonstrate how easy it can be to get people to falsely confess: 59 percent of the young adults in the experiment immediately confessed. {{U}} {{U}} 3 {{/U}} {{/U}}Of the 15 to 16-year-olds, 72 percent signed confessions, as did 78 percent of the 12 to 13-year-olds. "There's no question that young people are more at risk," says Saul Kassin, Professor at Williams College, who has done similar studies with similar results. {{U}} {{U}} 4 {{/U}} {{/U}}A psychology Both Kassin and Redlich note that the entire "interrogation" in their experiments consisted of a simple accusation-not hours of aggressive questioning-and still, most participants falsely confessed. Because of the stress of a police interrogation, they conclude, suspects can become convinced that falsely confessing is the easiest way out of a bad situation. {{U}} {{U}} 5 {{/U}} {{/U}} A. In her experiment participants were seated at computers and told not to hit the "Alt" key, because doing so would crash the systems. B. "In some ways," says Kassin, "false confession becomes a rational decision." C. "It's a little like somebody's working on them with a dental (牙齿的) drill," says Franklin Zimring, a law professor at the University of California at Berkeley. D. "But adults are highly vulnerable too." E. How could an innocent person admit to doing something he didn't do? F. Redlich also found that the younger the participant, the more likely a false confession.

填空题 阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为规定段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。 {{B}}Stress{{/B}}1. How often do you sit still and do absolutely nothing? The usual answer these days is never, or hardly ever. As the pace of life continues to increase, we are fast losing the art of relaxation. Once you are in the habit of rushing through life, being on the go from morning till night, it is hard to slow down and unwind. But relaxation is essential for a healthy mind and body,2. Stress is a natural part of everyday life. There is no way to avoid it, since it takes many and varied forms—driving in traffic, problems with personal relationships are all different forms of stress. Stress, in fact, is not as bad as it is often reputed to be. A certain amount of stress is vital to provide motivation and give purpose to life. It is only when the stress gets out of control that it can head to level performance and ill health.3. The amount of stress a person can withstand depends very much on the individual. Some people thrive on stress, and such characters are obviously prime material for managerial responsibilities. Others crumple at the sight of unusual difficulties.4. When exposed to stress, in whatever form, we react both chemically and physically. In fact we invoke (调用) the fight mechanism which in more primitive days made the difference between life or death. The crises we meet today are unlikely to be so extreme, but however minimal the stress, it involves the same response. All the energy is diverted to cope with the stress, with the result that other function, such as digestion, are neglected.5. It is when such a reaction is prolonged, through continued exposure to stress, that health becomes endangered. Such serious conditions as high blood pressure, coronary heart disease all have established links with stress. The way stress affects a person also varies with the individual. Stress in some people produces stomach disorders, while others succumb to tension headaches. Since we cannot remove stress from our lives, we need to find ways to cope with it.A. The harm of stressB. How much stress a person can withstandC. Our body's reaction to stressD. The forms and use of stressE. How to deal with stressF. Blood pressure and stress

填空题下面短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原位置，发恢复文章原貌。 The Value of Motherhood In shopping malls, the assistants try to push you into buying "a gift to thank her for her unselfish love". When you log onto(登录到)website, a small pop-up(弹出式菜单) invites you to book a bouquet(花 束) for her.{{U}} (46) {{/U}} The American version of Mother's Day was thought up as early as 1905, by Anna Jarvis, as a way of recognizing the real value of motherhood. The popularity of Mother's Day around the world suggests that Jarvis got all she wanted. In fact, she got more — enough to make her horrified. {{U}} (47) {{/U}}They buy, among other things, 132 million cards. Mother's Day is the No.1 holiday for flower purchases. Then there are the various commodities, ranging from jewelry and clothes to cosmetics and washing powder, that take advantage of the promotion opportunities. Because of this, Jarvis spent the last 40 years of her life trying to stop Mother's Day. One protest against the commercialization(商品化) Mother's Day even got her arrested for disturbing the peace, interestingly. {{U}} (48) {{/U}}As Ralph Fevre, a reporter at the UK newspaper The Guardian, observe, traditionally "motherhood is something that we do because we think it's right. " But in the logic of commercialism, people need something in exchange for their time and energy. A career serves this purpose better. In addition, women are being encouraged to pursue any career they desire. So they work hard and play hard.{{U}} (49) {{/U}} {{U}} (50) {{/U}}According to The Guardian, there are twice as many child-free young women as there were a generation ago. Or, they put off the responsibility of parenting until later in their lives. So, Fevre writes that the meaning of celebrating Mother's Day needs to be updated : "It is to persuade people that parenting is a good idea and to honor people for their attempt to be good people." A. Commercial warmth and gratitude are the atmosphere being spread around for this special Sunday in May. B. But what's more, commercialism changes young people's attitude towards motherhood. C. Obviously, the best girl will be a phone call or a visit. D. According to a research by the US card company Hallmark, 96 percent of American consumers celebrate the holiday. E. As a result, motherhood has suffered a huge drop in status since the 1950s. F. Becoming a mother, however, inevitably handicaps career anticipation.

填空题Geology and Health 1 The importance of particular metals in the human diet has been realized within the Dast few decades, and the idea that geology might be related to health has been recognized for a number of elements such as iodine, zinc and selenium. For example, soils with low iodine contents produce crops, and animals deficient in iodine. A lack of iodine in the human diet leads to some serious diseases. 2 The ultimate source of metals within the human body is rocks, which weather into soil, gaining or losing some of their chemical constituents. The crops we eat selectively remove from the soil the elements that they require for growth. The water we drink contains trace elements leached from rock and soil. Thus the geology and geochemistry of the environments have effects on the chemistry and health of plants, animals and people. 3 So far there is no data to suggest that people living on metal - rich soils experience a potential health hazard. The levels of metals within naturally contaminated soils are generally not high enough to cause serious health problems. Living on metal -rich soils does not represent a health risk unless large quantities of soil are digested or metal - rich dust is inhaled. However, small children are particularly exposed to metal - rich topsoil in playgrounds and gardens. They are also the most likely ones to eat potentially dangerous metal- rich soil. 4 Heavy metals are persistent; they do not break down to other chemicals in the environment. Industrially polluted sites usually undergo intensive clean -up and rehabilitation because heavy metals are a health concern once they enter the food chain. Some trace metals are alleged to cause cancer and are also known to cause poisoning. 5 In contrast, naturally contaminated soils have not been subject to risk assessment studies and rehabilitation measures, despite the fact that they frequently possess metal concentrations well above those of such polluted by humans and above environmental quality criteria. 6 There is a vital need to understand the potential risks and long - term health effects of living on naturally contaminated soils. Future environmental investigations of naturally polluted soils should concentrate on the potential pathways of metals into the food chain and human body. Geologists should be part of such studies as they can provide the essential background information on rock and soil chemistry as well as the chemical forms of heavy metal pollution.A. No evidence to indicate bad effects of naturally contaminated soilB. Potential hazards of human contaminated soilsC. Research on channels of heavy metals getting into human food chainD. Geology and health problemsE. Rocks - the ultimate source of soil pollutionF. Long -term health effects on children

填空题 A. by social and economic changes B. guided self-study and correspondence courses C. by studying together with children D. what they did not manage to learn earlier E. dates back to the eighteenth century F. mass production