填空题A Memory Drug? IT'S DIFFICULT TO IMAGINE MANY THINGS that people would welcome more than a memory — enhancing drug. (1) Furthermore, such a drug could help people remember past experiences more clearly and help us acquire new information more easily for school and at work. As scientists learn more about memory, we are closing in on this tantalizing goal. Some of the most exciting evidence comes from research that has built on earlier findings linking LTP and memory to identify a gene that improves memory in mice. (2) Mice bred to have extra copies of this gene showed more activity in their NMDA receptors, more LTP, and improved performance on several different memory tasks — learning a spatial layout, recognizing familiar objects, and recalling a fear-inducing shock. If these basic insights about genes, LTP, and the synaptic basis of memory can be translated to people — and that remains to be seen — they could pave the way for memory-enhancing treatments. (3) As exciting as this may sound, it also raises troubling issues. Consider the potential educational implications of memory-enhancing drugs. If memory enhancers were available, children who used them might be able to acquire and retain extraordinary amounts of information, allowing them to progress far more rapidly in school than they could otherwise. How well could the brain handle such an onslaught of information? What happens to children who don't have access to the latest memory enhancers? Are they left behind in school — and as a result handicapped later in life? (4) Imagine that you are applying for a job that requires a good memory, such as a manager at a technology company or a sales position that requires remembering customers' names as well as the attributes of different products and services. Would you take a memory-enhancing drug to increase your chances of landing the position? Would people who felt uncomfortable taking such a drug find themselves cut out of lucrative career opportunities? Memory drugs might also help take the sting out of disturbing memories that we wish we could forget but can't. The 2004 hit movie Eternal Sunshine of the Spotless Mind told the story of a young man seeking just such freedom from the painful memories of a romantic breakup. As you will see in the section on persistence later in the chapter, emotionally arousing events often create intrusive memories, and researchers have already muted emotional memories with drugs that block the action of key hormones. Should emergency workers who must confront horrifying accident scenes that can burden them with persisting memories be provided with such drugs? Should such drugs be given to rape victims who can't forget the trauma? Memory drugs might provide some relief to such individuals. But could they also interfere with an individual's ability to assimilate and come to terms with a difficult experience? (5) A. Like steroids for bulking up the muscles, these drugs would bulk up memory. B. A memory enhancer could help eliminate forgetting associated with aging and disease. C. What are the potential implications of memory-enhancing drugs for the workplace? D. We may find ourselves struggling with these kinds of questions in the not-too-distant future. E. There is a pill that you could take every day to allow you to remember everything. F. The gene makes a protein that assists the NMDA2 receptor, which plays an important role in long-term memory by helping to initiate LTP.

填空题 1. Medical care has three main elements: diagnosis of disease or injury, treatment of disease or injury, and prevention of disease. 2. Serious ailments require diagnosis by an expert, who, in most cases, is a doctor. Doctors use three main types of "clues" in making a diagnosis:the patient's case history, the doctor' s physical examination of the patient, and the results of medical tests. Patients provide their own medical history by answering questions about their physical condition and past illnesses. Doctors use medical instruments, such as a stethoscope to listen to a patient's heart and lungs, to perform a physical examination. Medical laboratories aid diagnosis by making chemical and microscopic tests on body fluids and tissues. A physician may also order tests that use X rays, sound waves or electric waves to detect disease by literally looking inside the body. 3. People usually recover from minor illnesses and injuries without special treatment. In these cases, doctors may simply reassure their patients and allow the body to heal it-self. But serious ailments generally require special treatment. In these cases, a doctor may prescribe drugs, surgery, or other treatment. For thousands of years, drugs and surgery have provided two of the chief methods of treating disease. But modern science has helped make these methods much more effective than they used to be. Penicillin aad other "wonder drugs" help cure many infectious diseases that were once extremely difficult to treat. With the help of machines, surgeons can repair or replace organs that have been seriously damaged, including the heart and kidneys. Science has also helped develop entirely new methods of treatment. Radiotherapy, for example, makes use of X-rays and radioactive rays to treat cancer. 4. Doctors help prevent disease in various ways. They may give vaccinations to guard against such diseases as polio, hepatitis, and measles. They may also order a special diet or drug to strengthen a patient's natural defenses against illness. People can also help themselves remain healthy by exercising, by not smoking, and by avoiding use of alcohol or illegal drugs. Doctors can prevent many diseases from becoming serious by diagnosing and treating them in their early stages. For this reason, most doctors recommend regular physical examinations. 5. Local governments also contribute to the prevention of disease. They do sc by enforcing public health measures. For instance, they make sure that the community has pure drinking water and a system of garbage and sewage disposal. A number of national and international organizations work to improve the quality of medical care. These organizations encourage medical education and research, help standardize medical practice, and enforce codes of professional conduct.

填空题Development in Newspaper Organization One of the most important developments in newspaper organization during the first part of the twentieth century 1 , which are known as wire services. Wire-service companies employed reporters, who covered stories all over the world. Their news reports were sent to papers throughout the country by telegraph. The papers paid an annual fee for this service. Wire services continue 2 . Today the maj6r wire services are the Associated Press (AP) and United Press International (PUI). You will frequently find AP or UPI at the beginning of a news story. Newspaper chains and mergers began to appear in the early 1900s. A chain consists of two or more newspapers 3 . A merger involves combining two or more papers into one. During the nineteenth century many cities had more than one competitive independent paper. Today in most cities there are only one or two newspapers, and 4 . Often newspapers in several cities belong to one chain. Papers have combined 5 . Chains and mergers have cut down production costs and brought the advantages of big-business methods to the newspaper industry. A. to play an important role in newspaper operations B. was the growth of telegraph services C. and they usually enjoy, great prestige D. they are usually operated by a single owner E. in order to survive under the pressure of rising costs F. owned by a single person or organization

填空题Seeing Hands In the Soviet Union several cases have been reported recently of people who can read and detect colors with their fingers (46) . One case concerns an eleven-year-old school girl, Vera Petrova, who has normal vision but who can also perceive things with different parts of her skin, and through solid wails. (47) . One day she came into his office and happened to put heir hands on the door of a locked safe. Suddenly she asked her father why he kept so many old newspapers locked away there, (48) . Vera's curious talent was brought to the notice of a scientific research institute in the town of Ulyanovsk, near where she live and in April she was given a series of tests by a special commission of the Ministry of Health of the Russian Federal Republic. During these tests she was able to read a newspaper through an opaque screen and, stranger still, by moving her elbow over a child's game of Lotto she was able to describe the figures and colors printed on it; and, in another instance, wearing stockings and slippers, to make out with her foot the outlines and colors of a picture hidden under a carpet. (49) . During all these tests Vera was blindfold; and, indeed, except when blindfold she lacked the ability to perceive things with her skin. It was also found that although she could perceive things with her fingers (50) . A. and even described the way they were done up in bundles. B. Other experiments showed that her knees and shoulders had a similar sensitivity. C. and even see through solid doors and walls. D. Anther Russian girl, Rosa Kuleshova, could read blindfold. E. this ability ceased the moment her hands were wet. F. This ability was first noticed by her father.

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 can 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 grillings (盘问) is enormous. (46) "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 study to determine how likely people are to confess to things they didn't do. (47) 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. (48) 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, a psychology professor at Williams College, who has done similar studies with similar results. (49) 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. (50) A. In her experiment, participants were seated at computers and told not to hit the "ah" 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 阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 Strawberries: In a study that tracked the diets and health of 1, 271 people in Massachusetts, researchers at the Harvard School of Public Health found that strawberry-lovers were 70 percent less likely than those who rarely ate the fruit to develop cancer.{{U}} (46) {{/U}}. Tomatoes: With their load of vitamin C, tomatoes are the richest source of the fiery red pigment lycopene, which has been shown to defend against malignancies of the lungs, cervix, prostate, and mouth{{U}} (47) {{/U}}. If they need to ripen, leave them in a cool spot in your kitchen for a day or two. Oranges: Like all citrus fruits, oranges are known for their aromatic oils and high vitamin C content.{{U}} (48) {{/U}} Garlic: Garlic could be your ticket to longevity. The same sulfur compounds that give the bulb its pungent flavour protect against cancer both by neutralizing carcinogens and slowing tumors' growth. If you don't care for garlic, take heart: onions, leeks, shallots, and chives deliver many of the same cancer-fighting substances. Tea:{{U}} (49) {{/U}}. One recent study found that certain of these compounds appear to keep newly formed tumor cells from growing out of control, a trick they pull off by restoring a chemical in the body that limits how many times the rogue cells can divide. Whole Wheat:{{U}} (50) {{/U}}. Grain-lovers ran one-third the risk of people who rarely ate whole grain bread or cereal. A. Loaded with nutrients and fiber, grains have many of the same phytochemicals as fresh produce. B. But berries of every kind offer benefits. C. A lot of people in China like to drink tea because it's traditional. D. Whatever you do, don't put fresh tomatoes in the fridge unless you want to spoil their flavour and texture. E. Tea is rich in antioxidants called polyphenols. F. Citrus-lovers show comparatively low rates of stomach and lung cancers.

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1～4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}}English and English Community{{/B}}1. There is no doubt that English is a useful language. The people who speak English today make up the largest speech community in the world with the exception of speakers of Chinese.2. A speech community is similar to other kinds of communities. The people who make up the community share a common language. Often they live side by side, as they do in a neighborhood (街坊), a village, or a city. More often they form a whole country. National boundaries, however, are not always the same as the boundaries of a speech community. A speech community is any group of people who speak the same language no matter where they happen to live.3. We may say that anyone who speaks English belongs to the English speech community. For convenience (方便), we may divide the speakers into two groups: one in which the speakers use English as their native language, the other in which the speakers learn English as a second language for the purpose of education, commerce, and so on.4. Learning a second language extends one's vision and expands the mind. The history and literature of a second language record the real and fictional (虚构的) lives of people and their culture; a knowledge of them adds to our ability to understand and to feel as they feel. Learning English as a second language provides another means of communication through which the window of the entire English speech community becomes a part of our heritage.

填空题A. a longer life expectancy for most people B. artists are adroit in dealing with their painting subject C. engage in the medical profession D. careful study and experimentation E. the chief centers for medical care in most countries F. science and technology

填空题 Single-parent Kids Do Best Single mums are better at raising their kids than two parents—at least in the bird world. Mother zebra finches have to work harder and raise fewer chicks on their own, but they also produce more attractive sons who are more likely to get a mate. The finding shows that family conflict is as important an evolutionary driving force as ecological factors such as hunting and food supply. {{U}} {{U}} 1 {{/U}} {{/U}} In evolutionary terms, the best strategy for any parent in the animal world is to find someone else to care for their offspring, so they can concentrate on breeding again. So it's normal for parents to try to pass the buck to each other. But Ian Hartley from the University of Lancaster and his team wondered how families solve this conflict, and how the conflict itself affects the offspring. {{U}} {{U}} 2 {{/U}} {{/U}}They compared single females with pairs, by monitoring the amount of food each parent collected, and removing or adding chicks so that each pair of birds was raising four chicks, and each single mum had two—supposedly the same amount of work. But single mums, they found, put in about 25 per cent more effort than females rearing with their mate. {{U}} {{U}} 3 {{/U}} {{/U}}"The offspring suffer some of the cost of this conflict," says Hartley. The cost does not show in any obvious decrease in size or weight, but in how attractive they are to the opposite sex. When the chicks were mature, the researchers tested the "fitness" of the male offspring by offering females their choice of partner. {{U}} {{U}} 4 {{/U}} {{/U}} Sexual conflict has long been thought to affect the quality of care given to offspring, says zoologist Rebecca Kilner at Cambridge University, who works on conflict of parents in birds. "But the experimental evidence is not great. The breakthrough here is showing it empirically." More surprising, says Kilner, is Hadley's statement that conflict may he a strong influence on the evolution of behaviour, clutch size and even appearance. "People have not really made that link," says Hartley. A female's reproductive strategy is usually thought to be affected by hunting and food supply. {{U}} {{U}} 5 {{/U}} {{/U}} A. To avoid being exploited, mothers with a partner hold back from working too hard if the father is being lazy, and it's the chicks that pay the price. B. To find out, they measured how much effort zebra finch parents put into raising their babies. C. Those males reared by single mums were chosen more often than those from two-parent families. D. With two parents around, there's always a conflict of interests, which can have a detrimental effect on the quality of the offspring. E. Kilner says conflict of parents should now be taken into account as well. F. It turned out that single mums had greater influence on their offspring.

填空题More Rural Research Is needed 1 Agricultural research funding is Vital if the world is to feed itself better than it does now. Dr. Tony Fischer, crop scientist, said demand was growing at 2.5% per year, but with modern technologies and the development of new ones, the world should be able to stay ahead. 2 "The global decline in investment in international agricultural research must be reversed if significant progress is to be made towards reducing malnutrition and poverty," he said. 3 Research is needed to solve food production, land degradation and environmental problems. Secure local food supplies led to economic growth which in turn slowed population growth Dr. Fischer painted a picture of the world's ability to feed itself in the first 25 years, when the world's population is expected to rise from 5.8 to 8 billion people. He said that things will probably hold or improve but there'll still be a lot of hungry people. The biggest concentration of poor and hungry people would be in sub-Saharan Africa and southern Asia in 2020 similar to the current pattern. If there is any change, a slight improvement will be seen in southern Asia, but not in sub-Saharan Africa. The major improvement will be in East Asia, South America and South-East Asia. 4 The developing world was investing about 0.5%, or $8 billion a year, of its agricultural gross domestic product (GDP) on research, and the developed world was spending 2.5% of its GDS Dr. Fischer said more was needed from all countries. 5 He said crop research could produce technologies that spread across many countries, such as wheat production research having spin-offs for Mexico, China or India. 6 "Technologies still need to be refined for the local conditions but a lot of the strategic research can have global application, so that money can be used very efficiently," Dr. Fischer said. 7 Yields of rice, wheat and maize have grown impressively in the past 30 years, especially in developing countries. For example, maize production rose from 2-8 tonnes per hectare between 1950 and 1995. But technologies driving this growth, such as high-yield varieties, fertilizers, and irrigation, were becoming exhausted. "If you want to save the land for non-agricultural activities, for forests and wildlife, you're going to have to increase yield," Dr. Fischer said.A. The Same or Improved Food Supply Situation in 2020B. Research Focus on Increased YieldC. More Research Funding NeededD. Local Situations AnalyzedE. ncrease in Investment on Agricultural ResearchF. Sustained Development of Modern Technologies

填空题Pregnant Women Warned About ACE Inhibitor Some of the most commonly used medicines for high blood pressure are drugs called ACE inhibitors. Doctors have given these drugs to patients for twenty-five years. A government study in the United States found that the use almost doubled between 1995 and 2000. Doctors have known for years that women should not take ACE inhibitors during the last six months of pregnancy. The medicine can injure the baby. ACE inhibitors, though, have been considered safe when taken during the first three months. But a new study has found that women who take these drugs early in their pregnancy still increase the risk of birth disorders. The study shows that, compared to others, their babies were almost three times as likely to be born with major problems. These included problems with the formation of the brain and nervous system and holes in the heart. The researchers say they found no increased risk in women who took other blood pressure medicines during the first three months. Researchers at Vanderbilt University in Tennessee and Boston University did the study. The New England Journal of Medicine published the results. The researchers studied the records of almost thirty thousand births between 1985 and 2000. Two hundred nine babies were born to women who took ACE inhibitors during the first three months of their pregnancies. Eighteen of the babies, or almost nine percent, had major disorders. ACE inhibitors are often given to patients with diabetes. But diabetes during pregnancy can result in birth defects. So the study did not include any women known to be diabetic. ACE inhibitors suppress a protein called angiotensin-converting enzyme or ACE. This enzyme produces a chemical in the body that makes blood passages narrow. The drugs increase the flow of blood so pressure is reduced. New drugs are tested on pregnant animals to see if they might cause birth defects in humans. But experts say these tests are not always dependable. The United States Food and Drug Administration helped pay for the study. The F. D. A. says women who might become pregnant should talk with their doctor about other ways to treat high blood pressure.

填空题Before July 1st, many young people go to CMVD to get ______.

填空题 First Aid1 First aid is the kind of medical that are given to a victim of an accident or sudden sickness before trained medical help can arrive. First aid techniques are often simple. They can be taught to people of all ages. And learning them is important. Knowing how to treat someone in an emergency can mean the difference beween life and death.2 Thousands of persons die each year after eating or drinking poison substances. Experts say most accidental poisonings happen in or near the home. And most are caused by substances we commonly use at home: medical supplies, insect poisons or cleaning fluids. There are several common signs of poisoning. A sudden feeling of pain or sickness. Burns in the area of the mouth. Or an unusual smell coming from a person's mouth.3 Health experts generally advise poison victims to drink water or milk. But never give liquids to someone who is not awake or to those having a violent reaction to the poison. Next, seek help from trained medical experts. Save material expelled from the mouth for doctors to examine. Save the container of the suspected poison to answer questions the doctors may have. The container also may describe a substance that halts the poison's effects. Use this substance without delay.4 The American Red Cross says all homes should have at least three substances to deal with poisoning. One, syrup of ipecac(吐根糖浆),is a fluid that helps the body expel material from the stomach. Another, activated charcoal (活性炭), lessens the danger of poisons. The other material, epsom salts(泻盐), helps to speed the release of body wastes. All three should be used only on the advice of a medical expert.5 The Red Cross says expulsion (清除) of material from the stomach—vomiting (呕吐)— sometimes may be started if medical advice is delayed. But it says vomiting should be used only when it is known the victim took too much of what is called a general poison, such as a medicine. The experts say never cause vomiting if the victim was poisoned by a petroleum product or by a substance that was a strong acid or a strong alkali(碱). These victims should be taken to a medical center as soon as possible.

填空题Natural Gas 1. Natural gas is produced from reservoirs deep beneath the earth"s surface. It is a fossil fuel, meaning that it is derived from organic material buried in the earth millions of years ago. The main component of natural gas is methane (甲烷). 2. The popularity and use of clean natural gas has increased dramatically over the past 50 years as pipeline infrastructure (基础设) has been installed to deliver it conveniently and economically to millions of residential, commercial and industrial customers worldwide. Today, natural gas service is available in all 50 states in the US, and is the leading energy choice for fueling American homes and industries. More than 65 million American homes use natural gas. In fact, natural gas is the most economical source for home energy needs, costing one-third as much as electricity. In addition to heating homes, much of the gas used in the United States is used as a raw material to manufacture a wide variety of products, from paint, to fibers for clothing, to plastics for healthcare, computing and furnishings. Natural gas is also used in a significant number of new electricity-generating power plants. 3. Natural gas is one of the safest and cleanest fuels available. It emits less pollution than other fossil fuels. When natural gas is burned, it produces mostly carbon dioxide (二氧化碳) and water vapor—the same substances emitted when humans exhale. Compared with some other fossil fuels, natural gas emits the least amount of carbon dioxide into the air when combusted (燃烧), making natural gas the cleanest burning fossil fuel of all. The industry also is subject to substantial federal regulation in the areas of production and distribution, which help ensure it is provided to consumers safely and cleanly. 4. The United States consumes about one third of the world"s natural gas output, making it the largest gas consuming region in the world. The U. S. Department of Energy"s Energy Information Administration forecasts that natural gas demand will grow by more than 50 percent by 2025. 5. There are huge reserves of natural gas beneath the earth"s surface. The largest reserves of natural gas can be found in Russia, West and North Africa and the Middle East. LNG (液化天然气) has been produced domestically and imported in the United States for more than four decades. Today, the leading importers of LNG are Japan, Korea, France and Spain.

填空题Psychologists think that there are two types of emotion: positive and negative. Positive emotions include love, liking, joy, delight, and hope. They are aroused by something that appeals to a person. ______ They include anger, fear, despair, sadness, and disgust. In growing up, a person learns to cope with the negative emotions in order to be happy.A. Emotions, however, may be weak or strong.B. In order to feel happy, the person may choose unusual ways to avoid the emotion.C. An emotion does not have to be created by something in the outside world.D. A growing child not only learns his emotions but learns how to act in certain situations because of an emotion.E. For example, a student taking all examination may be so worried about failing that hecannot think properly.F. Negative emotions make a person unhappy or dissatisfie

填空题Every Dog Has Its Say Kimiko Fukuda, a Japanese girl, always wondered what her dog was trying to say. Whenever she put on makeup, it would pull at her sleeve. 1 When the dog barks, she glances at a small electronic gadget (装置). The following "human" translation appears on its screen: "Please take me with you." "I realized that"s how he was feeling," said Fukuda. The gadget is called Bowlingual, and it translates dog barks into feelings. People laughed when the Japanese toymaker Takara Company made the world"s first dog-human translation machine in 2002. But 300,000 Japanese dog owners bought it. 2 "Nobody else had thought about it," said Masahiko Kajita, who works for Takara. "We spend so much time training dogs to understand our orders; what would it be like if we could understand dogs?" Bowlingual has two parts. 3 The translation is done in the gadget using a database (资料库) containing every kind of bark. Based on animal behaviour research, these noises are divided into six categories: happiness, sadness, frustration, anger, declaration and desire. 4 In this way, the database scientifically matches a bark to an emotion, which is then translated into one of 200 phrases. When a visitor went to Fukuda"s house recently, the dog barked a loud "bow wow". This translated as "Don"t come this way". 5 The product will be available in US pet stores this summer for about US $120. It can store up to 100 barks, even recording the dog"s emotions when the owner is away. A. Wireless microphone is attached to the dog"s collar, which sends information to the gadget held by the owner. B. Nobody really knows how a dog feels. C. It was followed by "I"m stronger than you" as the dog growled (嗥叫) and sniffed (嗅) at the visitor. D. More customers are expected when the English version is launched this summer. E. Now, the Japanese girl thinks she knows. F. Each one of these emotions is then linked to a phrase like "Let"s play", "Look at me", or "Spend more time with me".

填空题1. Moods, say the experts, are emotions that tend to become fixed, influencing one's outlook for hours, days or even weeks. That's great if your mood is a pleasant one, but a problem if you are sad, anxious, angry or simply lonely. 2. Perhaps the best way to deal with such moods is to talk them out; sometimes, though, there is no one to listen. Modern pharmacology(药物学)offers n abundance of tranquilizers(镇静剂), antidepressants and anti-anxiety drugs. What many people don't realize, however, is that scientists have discovered the effectiveness of several non-drug approaches to make you loose from an unwanted mood. These can be just as useful as drugs, and have the added benefit of being nonpoisonous. So next time you feel out of sorts, don't head for the drug-store--try the following approach. 3. Of all the mood-altering self-help techniques, aerobic(增氧健身的)exercise seems to be the most efficient cure fox a bad mood. "If you could keep the exercise, you'd be in high spirits," says Kathryn Lance, author of Running for Health and Beauty. 4. Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as a mood-raiser. Physical exertion such as housework, however, does little. The key is aerobic exercise——running, cycling, walking, swimming or other repetitive and sustained activities that boost the heart rate, increase circulation and improve the body's utilization of oxygen. Do them for at least 20 minutes a session three to five times a week.

填空题You will find it hard to make friends with people ______.

填空题Science and Technology There is a difference between science and technology. 1 Science has to do with discovering the facts and relationships between observable phenomena in nature and with establishing theories that serve to organize these facts and relationships; technology has to do with tools, techniques, and procedures for applying the findings of science. 2 Progress in science excludes the human factor. Scientists, who seek to understand the universe and know the truth within the highest degree of accuracy and certainty, cannot pay attention to their own or other peoples likes or dislikes or to popular ideas about the fitness of things. 3 But even an unpleasant truth is more than likely to be useful; besides, we have the choice of refusing to believe it! But hardly so with technology; we do not have the choice of refusing to hear the sound produced by a supersonic (超音速的) aircraft flying overhead; we cannot refuse to breathe polluted air. 4 The purpose of technology is to serve people—people in general, not merely some people; and future generations, not merely those who presently wish to gain advantage for themselves. 5 Many people blame technology itself for widespread pollution, resource depletion (枯竭) and even social decay in general—so much so that the promise of technology is "obscured". That promise is a cleaner and healthier world. If wise applications of science and technology do not lead to a better world, what else will? A. Another distinction between science and technology has to do with the progress in each. B. Unlike science, progress in technology must be measured in terms of the human factor. C. What scientists discover may shock or anger people—as did Darwin"s theory of evolution. D. Science and technology are different. E. We are all familiar with the improper use of technology. F. Science is a method of answering theoretical questions; technology is a method of solving practical problems.

填空题A. everythingB. a great successC. a tremendous failureD. nothingE. many firstsF. quite possible