单选题He impressed all his colleagues as a Uvigorous/U man in the prime of his career.

单选题The rising cost of living is as hard on country families as on city families.A. nationB. countrysideC. stateD. province

单选题Why is the Native Language Learnt So Well? How does it happen that children learn their mother tongue so well? When we compare them with adults learning a foreign language, we often find this interesting fact. A little child without knowledge or experience often succeeds in a complete mastery of the language. A grown-up person with fully developed mental powers, in most case, may end up with a faulty and inexact command. What accounts for this difference? Despite other explanations, the real answer in my opinion lies partly in the child himself, partly in the behavior of the people around him. In the first place, the time of learning the mother tongue is the most favorable of all, namely, the first years of life. A child hears it spoken from morning till night and, what is more important, always in its genuine form, with the right pronunciation, right intonation, and right use of words and right structure. He drinks in all the words and expressions, which come to him in a flash, ever-bubbling spring. There is no resistance: there is perfect assimilation. Then the child has, as it were, private lessons all the year round, while an adult language-student has each week a limited number of hours, which he generally shares with others. The child has another advantage: he hears the language in all possible situations, always accompanied by the right kind of gestures and facial expressions. Here there is nothing unnatural, such as is often found in language lessons in schools, when one talks about ice and snow in June or scorching heat in January. And what a child hears is generally what immediately interests him. Again and again, when his attempts at speech are successful, his desires are understood and fulfilled. Finally, though a child"s "teachers" may not have been trained in language teaching, their relations with him are always close and personal. They take great pains to make their lessons easy.

单选题 New US Plan for Disease Prevention Urging Americans to take responsibility for their health, Health and Human Services Secretary Tommy Thompson on Tuesday launched a $15 million program to try to encourage communities to do more to prevent chronic diseases like heart disease, cancer and diabetes (糖尿病). The initiative highlights the costs of chronic diseases—the leading causes of death in the United States—and outlines ways that people can prevent them, including better diet and increased exercise. "In the United States today, 7 of 10 deaths and the vast majority of serious illness, disability and health care costs are caused by chronic diseases," the Health and Human Services Department said in a statement. The causes are often behavioral—smoking, poor eating habits and a lack of exercise. "I am convinced that preventing disease by promoting better health is a smart policy choice for our future," Thompson told a conference held to launch the initiative. "Our current health care system is not structured to deal with the rising costs of treating diseases that are largely preventable through changes in our lifestyle choices." Thompson said heart disease and strokes will cost the country more than $351 billion in 2003. "These leading causes of death for men and women are largely preventable, yet we as a nation are not taking the steps necessary for us to lead healthier, longer lives," he said. The $15 million is designed to go to communities to promote prevention, pushing for changes as simple as building sidewalks to encourage people to walk more. Daily exercise such as walking can prevent and even reverse heart disease and diabetes, and prevent cancer and strokes. The money will also go to community organizations, clinics and nutritionists who are being encouraged to work together to educate people at risk of diabetes about what they can do to prevent it and encourage more cancer screening. The American Cancer Society estimates that half of all cancers can be caught by screening, including Pap tests (巴氏试验) for cervical cancer (宫颈癌), mammograms for breast cancer, colonoscopies (结肠镜检查), and prostate (前列腺的) checks. If such cancers were all caught by early screening, the group estimates that the survival rate for cancer would rise to 95 percent.

单选题I expect that he will be able to cater for your particular needs,

单选题One Good Reason to Let Smallpox Live It's now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it — one in the US and one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves? (1) reality, of course, it was naive to (2) that everyone would let (3) of such a potent potential weapon. Undoubtedly several nations still have (4) vials. (5) the last "official" stocks of live virus bred mistrust of the US and Russia (6) no obvious gain. Now American researchers have (7) an animal model of the human disease, opening the (8) for tests on new treatments and vaccines. So once again there's a good reason to (9) the virus — just in (10) the disease puts in a reappearance. How do we (11) with the mistrust of the US and Russia? (12) . Keep the virus (13) international auspices in a well-guarded UN laboratory that's open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn't (14) the idea is wrong. If the virus (15) useful, then let's make it the servant of all humanity — not just a part of it.

单选题Dreams Everyone can dream. Indeed, everyone does dream. Those who (1) that they never dream at all actually dream (2) as frequently as the rest of us, (3) they may not remember anything about it. Even those of us who are perfectly (4) of dreaming night (5) night very seldom remember those dreams in (6) detail but merely retain an untidy mixture of seemingly unrelated impressions. Dreams are not simply visual-we dream with all our (7) , so that we appear to experience sound, touch, smell, and taste. One of the world's oldest (8) written documents is the Egyptian Book of Dreams. This volume is about five thousand years old, so you can (9) that dreams were believed to have a special significance even then. Many ancient civilisations believed that you (10) never wake a sleeping person as, during sleep, the soul had left the body and might not be able to return (11) time if the sleeper were suddenly (12) . From ancient times to the present (13) , people have been (14) attempts to interpret dreams and to explain their significance. There are many books available on the subject of dream interpretation, although unfortunately there are almost as many meanings for a particular dream (15) there are books.

单选题The recycling of aluminum conserves ninety-five percent of the energy needed to make new metal.

单选题The American Medical Association has called for the sport of boxing (拳击) to be banned.A. forbiddenB. regulatedC. studiedD. reorganized

单选题According to the latest report, the talks have {{U}}collapsed{{/U}}.

单选题Reading the job ad, he wondered whether he was eligible to apply for it.

单选题The Best Way to Reduce Your Weight You hear this: "No wonder you are fat. All you ever do is eat." You feel sad: "I skip my breakfast and supper. I run every morning and evening. What else can I do?" Basically you can do nothing. Your genes, not your life habits, determine your weight and your body constantly tries to maintain it. Albert Stunkard of the University of Pennsylvania found from experiments that, "80 percent of the children of two obese parents become obese, as compared with no more than 14 percent of the offspring of two parents of normal weight." How can obese people become normal or even thin through dieting? Well, dieting can be effective, but the health costs are tremendous. Jules Hirsch, a research physician at Rockefeller University, did a study of eight fat people. They were given a liquid formula providing 600 calories a day. After more than 10 weeks, the subjects lost 45 kg on average. But after leaving the hospital, they all regained. The results were surprising: by metabolic measurement, fat people who lost large amounts of weight seemed like they were starving. They had psychiatric problems. They dreamed of food or breaking their diet. They were anxious and depressed; some were suicidal. They hid food in their rooms. Researchers warn that it is possible that weight reduction doesn"t result in normal weight, but in an abnormal state resembling that of starved non-obese people. Thin people, however, suffer from the opposite: They have to make a great effort to gain weight. Ethan Sims, of the University of Vermont, got prisoners to volunteer to gain weight. In four to six months, they ate as much as they could. They succeeded in increasing their weight by 20 to 25 percent. But months after the study ended, they were back to normal weight and stayed there. This did not mean that people are completely without hope in controlling their weight. It means that those who tend to be fat will have to constantly battle their genetic inheritance if they want to significantly lower their weight. The findings also provide evidence for something scientists thought was true—each person has a comfortable weight range. The range might be as much as 9 kg. Someone might weigh 60-69 kg without too much effort. But going above or below the natural weight range is difficult. The body resists by feeling hungry or full and changing the metabolism to push the weight back to the range it seeks.

单选题Her father was a quiet man with g raceful manners.

单选题Food and Cancer Medical experts have suspected for many years that there is a strong link between what a person eats and cancer. They say a new study provides the first evidence that vitamins could reduce a person's chance of developing cancer. A team of Chinese and American scientists did the study. They are from American National Cancer Institute and the Cancer Institute of the Chinese Academy of Medical Sciences in Beijing. The Journal of the National Cancer Institute published the results of the study. About thirty thousand people between the ages of 40 to 69 took part in the study. They were from the northern central Chinese area of Linxian. Most of them took vitamins and minerals every day for five years. Linxian was chosen because the people there have an extremely high rate of cancer of stomach and esophagus. Researchers believe that fungus and molds in local foods may be partly responsible for the high cancer rate. Researchers divided those into eight groups. Seven of the groups received different mixtures of vitamins and minerals daily. The amounts of the vitamins and minerals were 1 to 2 times greater than what American health officials say is needed. The eighth group received sugar pills that had no effect. Those who seemed to gain the most received a mixture of a form of vitamin A called β-carotene, vitamin E and the mineral selenium. The vitamin and mineral are believed to prevent damage to cells caused by cancer-causing substances. Researchers reported a 13 percent drop in cancer rates in those who took β-carotene, vitamin E and selenium. They also found a 10 percent drop in the number of deaths caused by strokes from bursting blood vessels. Scientists warn that it is too soon to know if the effect would be the same among people in other countries. They note that the people in Linxian eat foods that lack necessary vitamins and minerals. Chinese officials will continue to record the health records of the people in Linxian for many years. For now officials reportedly are considering using the results of the study. They want to find a way to improve the health of people in Linxian and other small towns in China.

单选题Urban renewal programs strive to {{U}}upgrade{{/U}} areas that are becoming slums.

单选题Foot-and-mouth Disease Britons" most searing memories of their encounter with foot-and-mouth disease in 2001 are of the piles of animals slaughtered to try to stop its spread. Such a draconian policy might have been accepted had the disease been controlled quickly. But its ineffectiveness more than 6m cows, sheep and pigs were culled before the disease was eradicated—led to widespread revulsion and a government rethink. Just as in 2001, if an animal is thought to be infected, its herd will be culled and a quarantine zone set up. But this time, unless the disease is stamped out quickly, animals nearby will also be vaccinated to create a "fire-break" across which it is unlikely to travel. Already 300,000 doses of vaccine have been ordered, so that if government vets decide that slaughter alone is unlikely to be effective, they can start vaccinating straight away. Humans almost never catch foot-and-mouth and it rarely kills the cloven-hooved beasts it affects. But animals produce less milk and meat, so its economic effects are severe. It is also highly contagious: infected livestock produce the virus that causes it in large quantities, and transmit it through saliva, mucus, milk, faeces and even droplets in their breath. Even so, only countries where foot-and-mouth is endemic, as in parts of Latin America, vaccinate all animals. One reason is cost: the disease is caused by a virus with seven main types and tens of sub-types, with a targeted vaccine needed for each strain and shots repeated, perhaps as often as twice a year. It is also because vaccinating damages exports. Places that are free from foot-and-mouth are unwilling to import vaccinated beasts, or fresh meat from them, because they may still carry the disease. The fear of being shut out of foreign markets led to the British government"s disastrous foot-dragging over vaccination in 2001. But that same year an outbreak in the Netherlands involving 26 farms was brought under control in just one month by vaccinating 200,000 animals. Though healthy, these beasts then had to be culled so that farmers could return to exporting without restrictions as soon as possible. Not even eternal vigilance on imports can keep a country free of foot-and-mouth disease: the latest outbreak was apparently caused by a breach of bio-security at the Pirbright laboratory complex in Surrey, where government researchers keep the live virus for vaccine research and Merial, an American animal-health company, manufactures vaccine for export. Human action, accidental or deliberate, seems likely to have been involved. Ironically, one reason for eschewing vaccination is that although it provides the best hope of dealing with outbreaks, maintaining the capacity to produce vaccine is itself a risky business. Many earlier episodes of foot-and-mouth in countries normally free from the disease have been caused by laboratory escapes; in 1970 a leak from Pirbright"s isolation facilities was fortunately contained.

单选题Both countries have been making efforts to ease tension.

单选题His parent won' t let her marry anyone ______ family is poor.A. thatB. whomC. whatD. Whose

单选题 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 {{B}}Charter Schools{{/B}} American public education has changed in recent years. One change is that increasing numbers of American parents and teachers are starting independent public schools called charter schools. In 1991, there were{{U}} (51) {{/U}}charter schools in the United States. Today, more than 2,300 charter schools{{U}} (52) {{/U}}in 34 states ar/d the District of Columbia, 2,575,000 students{{U}} (53) {{/U}}these schools. The students are from 5 years{{U}} (54) {{/U}}age through 18 or older.A charter school is created by groups of parents, teachers and community members. It is similar{{U}} (55) {{/U}}some ways to a traditional public school. It receives tax money to operate just as{{U}} (56) {{/U}} public schools do. The amount it receives depends{{U}} (57) {{/U}}the number of students. The charter school must prove{{U}} (58) {{/U}}local or state governments that its students are learning. These governments provide the school{{U}} (59) {{/U}}the agreement, or charter that permits it to operate. Unlike a traditional public school,{{U}} (60) {{/U}}, the charte'r school does not have to obey most laws governing public schools. Local, state or federal governments cannot tell it what to teach. Each school can choose its own goals and decide the ways it wants to{{U}} (61) {{/U}}those goals. Class sizes usually are smaller than in many traditional public schools. Many students and parents say teachers in charter schools can be more creative. However, state education agencies, local education-governing committees and unions often{{U}}(62) {{/U}}charter schools. They say these schools may receive money badly needed by traditional public schools. Experts say some charter schools are doing well while others are struggling. Congress provided 200 million dollars for establishing charter schools in the 2002 federal budget.{{U}}(63) {{/U}}often the schools say they tack enough money for their programs. Many also lack needed space. {{U}}(64) {{/U}}, many of the 36 charter schools in the District of Columbia hold classes in crowded buildings. These schools have almost 11, 000 students. District officials say they have provided 14 former school buildings{{U}} (65) {{/U}}charter education. Yet, charter-school supporters say officials should try harder to find more space.

单选题The study also notes a steady decline in the number of college students takmg science courses.