单选题She could not answer, it was an immense load off her heart.

单选题Who Wants to Live Forever? If your doctor could give you a drug that would let you live a healthy life for twice as long, would you take it? The good news is that we may be drawing near to that date. Scientists have already extended the lives of flies, worms and mice in laboratories. Many now think that using genetic treatments we will soon be able to extend human life to at least 140 years. This seems a great idea. Think of how much more time we could spend chasing our dreams, spending time with our loved ones, watching our families grow and have families of their own. "Longer life would give us a chance to recover from our mistakes and promote long term thinking, " says Dr Gregory Stock of the University of California School of Public Health. "It would also raise productivity by adding to the year we can work. " Longer lives don't just affect the people who live them. They also affect society as a wbole. "We have war, poverty, all sorts of issues around, and I don't think any of them would be at all helped by having people live longer, " says US bioethicist Daniel Callahan. "The question is 'What will we get as a society? ' I suspect it won't be a better society. " It would certainly be a very different society. People are already finding it more difficult to stay married. Divorce rates are rising. What would happen to marriage in a society where people lived for 140 years? And what would happen to family life if nine or 10 generations of the same family were all alive at the same time? Research into ageing may enable women to remain fertile for longer. And that raises the prospect of having 100-year-old parents, or brothers and sisters born 50 years apart. We think of an elder sibling as someone who can protect us and offer help and advice. That would be hard to do if that sibling came from a completely different generation. Working life would also be affected, especially if the retirement age was lifted. More people would stay in work for longer. That would give us the benefits of age-skill, wisdom and good judgement. On the other hand, more people working for longer would create greater competition for jobs. It would make it more difficult for younger people to find a job. Top posts would be dominated by the same few individuals, making career progress more difficult. And how easily would a 25-year-old employee be able to communicate with a 125-year-old boss? Young people would be a smaller part of a society in which people lived to 140. It may be that such a society would place less importance on guiding and educating young people, and more on making life comfortable for the old. And society would feel very different if more of its members were older. There would be more wisdom, but less energy. Young people like to move about. Old people like to sit still. Young people tend to act without thinking. Old people tend to think without acting. Young people are curious and like to experience different things. Old people are less enthusiastic about change. In fact, they are less enthusiastic about everything. The effect of anti-ageing technology is deeper than we might think. But as the science advances, we need to think about these changes now. "If this could ever happen, then we'd better ask what kind of society we want to get, " says Daniel Callahan. "We had better not go anywhere near it until we have figure those problems out. /

单选题The Case of the Disappearing Fingerprints One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing (1) could become troublesome. A case released online in a letter by Annals of Oncology indicates how big a (2) of losing fingerprints is. Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to (3) his nasopharyngeal cancer. After three years on the (4) . the patient decided to visit U. S. relatives last December. But he was stopped by U. S. customs officials (5) 4 hours after entering the country when those officials couldn't get fingerpints from the man. There were no distinctive swirly (6) appearing from his index finger. U. S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Their index fingers are (7) and screened against digital files of the fingerprints of bad guys-terrorists and potential criminals that our federal guardians have been tasked with keeping out of the country. Unfortunately, for the Singaporean traveler, one potential (8) effect of his drug treatment is a smoothing of the tissue on the finger pads. (9) , no fingerprints. "It is uncertain when fingerprint loss will (10) to take place in patients who are taking capecitabine, " Tan points out. So he cautions any physicians who (11) the drug to provide their patients with a doctor's note pointing out that their medicine may cause fingerprints to disappear. Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn't raise any red flags. But he's also now got the explanatory doctor's note — and won't leave home (12) it. By the way, maybe the Food and Drug Administration, (13) approved use of the drug 11 years ago, should consider (14) its list of side effects associated with this medicine. The current list does note that patients may experience vomiting, stomach pain and some other side effects. But no where (15) it mention the potential for loss of fingerprints.

单选题They had a far better {{U}}yield{{/U}} than any other farm miles around this year. A. goods B. soil C. climate D. harvest

单选题What happened when honey badgers got used to humans around them?

单选题Norman Blamey is an artist of deep convictions. A. beliefs B. statements C. suggestions D. claims

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 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 world, 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? {{U}} (51) {{/U}}reality, of course, it was naive to{{U}} (52) {{/U}}that everyone would let {{U}} (53) {{/U}}of such a potent potential weapon. Undoubtedly several nations still have {{U}} (54) {{/U}}vials.{{U}} (55) {{/U}}the last "official" stocks of live virus bred mistrust of the US and Russia,{{U}} (56) {{/U}}no obvious gain. Now American researchers have{{U}} (57) {{/U}}an animal model of the human disease, opening the{{U}} (58) {{/U}}for tests on new treatments and vaccines. So once again there's a good reason to{{U}} (59) {{/U}}the virus—just in{{U}} (60) {{/U}}the disease puts in a reappearance. How do we{{U}} (61) {{/U}}with the mistrust of the US and Russia?{{U}} (62) {{/U}}. Keep the virus{{U}} (63) {{/U}}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{{U}} (64) {{/U}}the idea is wrong. If the virus{{U}} (65) {{/U}}useful, then let's make it the servant of all humanity—not just a part of it.

单选题"I have great confidence that by the end of the decade we'll know in vast detail how cancer cells arise," says microbiologist Robert Weinberg, an expert on cancer, "But," he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur. He discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available." This year, 50 percent of the 910 000 people who suffer from cancer will survive at least five years. In the year 2000, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistic(统计)rate still discouraging-13 percent for lung cancer, and 2 percent for cancer of the pancreas(胰腺). With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes(基因), are inactive in normal ceils. Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous. The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggest that we will never prevent all cancers. "Changes are a normal part of the evolutionary process," says oneologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, "We can't prepare a medicine against cosmic rays." The prospects for cure, though still distant, are brighter. "First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a limited number of genes in cells, which are always responsible for at least part of the trouble. If we can understand how cancer works, we can counteract its action./

单选题He must not allow this unusual barrier to stop him from fighting against the enemy.A. interiorB. obstacleC. innocenceD. advantage

单选题The seriously depressed person sees himself in a very negative way. He is sure that he is alone and hopeless. He often blames himself for ordinary faults and shortcomings which he exaggerates. He is very discouraged about himself, the world, and his future. He becomes less interested in what is going on around him and doesn't get satisfaction from things he used to enjoy. Fatigue and early morning sleeplessness are quite common. The depressed person may want to sleep more than usual. He may lose his appetite and lose weight or eat more than normally and gain weight. Another particular sign, seen in women is crying spells. Many of these spells are short and common. Some depressive illness may not show the usual signs of moody sadness and hopelessness. In these cases, the potential depression may mask itself as physical discomfort. It may be a cause of alcoholism, or it may cause addiction to a drug. Chronic fatigue and boredom, as well as continual failure, may be unrecognized forms of depression. There is even evidence that the overly active child may be making up for an potential depression. Depressives share the feeling that they have lost something very important to them, though often this is not really the case. From a feeling of loss, the depressed person progresses to false ideas that he is a loser and will always be a loser, that he must be worthless and perhaps not fit to live. He may even attempts suicide. So many very depressed people attempt suicide that depressive illness may be considered the only fatal mental illness. Not all those suffering from depressive illness do attempt suicide. Nor are all those who attempt suicide necessarily suffering from illness. But the relationship is striking. It is estimated that as many as 75 percent of those who attempt suicide are seriously depressed, Other studies show that the person hospitalized for depression is about 36 times more likely to commit suicide than is the non-depressed person. The greatest risk occurs during or immediately after hospitalization. After age 40, the possibility of suicide increases in very depressed persons. Almost twice as many women as men suffer from depressive illness. Almost twice as many women as men attempt suicide, but three times more men than women succeed, Depressions is a tragic condition which often leads to broken homes, ruined friendships and careers, and disrupted lives.

单选题Physical Exercise Are Helpful Declaring that physical exercise is one of the most powerful medicines to help improve our quality of life is not an exaggeration. The World Health Organization expressed the same view in its 2002 World Health Report, emphasizing that the damage produced by lack of physical activity was equal to the strong probability of serious illness such as heart disease and even some kinds of cancer. Those who have embraced an active lifestyle for years are familiar with the sort of physical and psychological benefits that come from exercise. Nevertheless a lot of people would never think of physical activity as a way of feeling better, simply because they don't think they are in need of it, or because they are lazy or maintain that they haven't got enough time. There are many positive effects that result from physical exercise and they are not only concerned with the physical aspects but also psychological and social ones. Beginning with the physical benefits, physical activity improves the life of the heart, bums off fat, lowers high blood pressure, makes tissues more resistant, and increases muscle flexibility and joint mobility. On a psychological level, physical activity helps reduce anxiety and stress by causing tension to disappear and by encouraging us to have a better sense of ourselves through listening to our bodies during movement. Lastly, seeing ourselves in better health is advantageous socially. The sense of satisfaction thus obtained will result in an increase of self-respect and self-confidence in terms of our ability to interact with others. The benefits linked to exercise have also not gone unnoticed in the business world, with more and more companies setting up gyms on-site. Employees' improved health translates into better performance and reduced costs as well as an increase in people's satisfaction in the work place. Physical activity is recommended for all age groups, including children. It is an important growth factor in a child's education. And for the elderly? There is no doubt that regular physical activity allows greater efficiency in daily life as well as creating more basic independence day by day, including the possibility of keeping in touch with others and not feeling isolated.

单选题Please don't refuse his help because he is so kind a man.A. turn downB. go downC. take downD. run down

单选题Do not waste time on insignificant points.______

单选题Many Women Who Beat Cancer Don"t Change Habits Many women who battle breast cancer will tell you it"s a life-changing experience. However, a new study shows that for many 1 , the changes aren"t always positive or permanent. Beth Snoke has watched her mother and both grandmothers battle and survive breast 2 . So when she was diagnosed, there was no doubt in her mind 3 she had to do. "I do exactly what the doctors say as far as the medicine that I"m on, as 4 as the vitamins, the diet, and the fitness. And I can"t stress enough 5 important that is," says Beth Snoke. But a surprising new study shows that 6 every woman who beats breast cancer is getting that message. In fact, nearly 40% of them say even 7 surviving breast cancer, they haven"t made significant changes in the 8 they eat or how much they exercise. "Not all survivors are taking advantage of this teachable moment and making positive health changes in 9 life," says Electra Paskett, PhD, at Ohio State University"s Comprehensive Cancer Center. Paskett says diet and exercise have been proven to not only help women feel better during and after treatment, they may 10 play a role in preventing some cancers from coming back. 11 growing evidence, some women just aren"t listening. "Colon cancer survivors 12 exercise have actually been shown to have improved survival rates. So, yes, it is true that perhaps by making some of these healthy choices we can actually increase their health," says Paskett. As a breast cancer survivor 13 , Paskett knows first hand how much difference diet and exercise can 14 the challenge, she says, is to get more survivors to be more like Beth, during and after treatment. Experts say exercising more and eating a healthier diet can also cut 15 on stress and help women overcome depression. There are more than 2 million breast cancer survivors living in the U.S. of those, nearly a million have yet to change their diet or exercise routines.

单选题Most people find {{U}}rejection{{/U}} hard to accept. A. refusal B. excuse C. client D. destiny

单选题How do you account for your absence from the class last Thursday? A. explain B. examine C. choose D. expand

单选题A Sunshade for the Planet Even with the best will in the world, reducing our carbon emissions is not going to prevent global warming. It has become clear that even if we take the most strong measures to control emissions, the uncertainties in our climate models still leave open the possibility of extreme warming and rises in sea level. At the same time, resistance by governments and special interest groups makes it quite possible that the actions suggested by climate scientists might not be implemented soon enough. Fortunately, if the worst comes to the worst, scientists still have a few tricks up their sleeves. For the most part they have strongly resisted discussing these options for fear of inviting a sense of complacency that might thwart efforts to tackle the root of the problem. Until now, that is. A growing number of researchers are taking a fresh look at large-scale "geoengineering" projects that might be used to counteract global warming. "I use the analogy of methadone," says Stephen Schneider, a climate researcher at Stanford University in California who was among the first to draw attention to global warming. "If you have a heroin addict, the correct treatment is hospitalization, and a long rehab. But if they absolutely refuse, methadone is better than heroin. " Basically the idea is to apply "sunscreen" to the whole planet. One astronomer has come up with a radical plan to cool the earth; launch trillions of feather-light discs into space, where they would form a vast cloud that would block the sun"s rays. It"s controversial, but recent studies suggest there are ways to deflect just enough of the sunlight reaching the earth"s surface to counteract the warming produced by the greenhouse effect. Global climate models show that blocking just 1.8% of the incident energy in the sun"s rays would cancel out the warming effects produced by a doubling of greenhouse gases in the atmosphere. That could be crucial, because even the most severe emissions- control measures being proposed would leave us with a doubling of carbon dioxide by the end of this century, and that would last for at least a century more.

单选题The once barren hillsides are now good farmland.

单选题 Who Want to Live Forever? If your doctor could give you a drug that would let you live a healthy life for twice as long, would you take it? The good news is that we may be drawing near to that date. Scientists have already extended the lives of flies, worms and mice in laboratories. Many now think that using genetic treatments we will soon be able to extend human life to at least 140 years. This seems a great idea. Think of how much more time we could spend chasing our dreams, spending time with our loved ones, watching our families grow and have families of their own. "Longer life would give us a chance to recover from our mistakes and promote long term thinking," says Dr. Gregory Stock of the University of California School of Public Health. "It would also raise productivity by adding to the year we can work." Longer lives don't just affect the people who live them. They also affect society as a whole. "We have war, poverty, all sorts of issues around, and I don't think any of them would be at all helped by having people live longer," says US bioethicist Daniel Callahan. "The question is 'What will we get as a society?' I suspect it won't be a better society." It would certainly be a very different society. People are already finding it more difficult to stay married. Divorce rates are rising. What would happen to marriage in a society where people lived for 140 years? And what would happen to family life if 9 or 10 generations of the same family were all alive at the same time? Research into ageing may enable women to remain fertile for longer. And that raises the prospect of having 100-year-old parents, or brothers and sisters born 50 years apart. We think of an elder sibling as someone who can protect us and offer help and advice. That would be hard to do if that sibling came from a completely different generation. Working life would also be affected, especially if the retirement age was lifted. More people would stay in work for longer. That would give us the benefits of age-skill, wisdom and good judgment. On the other hand, more people working for longer would create greater competition for jobs. It would make it more difficult for younger people to find a job. Top posts would be dominated by the same few individuals, making career progress more difficult. And how easily would a 25-year-old employee be able to communicate with a 125-year-old boss? Young people would be a smaller part of a society in which people lived to 140. It may be that such a society would place less importance on guiding and educating young people, and more on making life comfortable for the old. And society would feel very different if more of its members were older. There would be more wisdom, but less energy. Young people like to move about. Old people like to sit still. Young people tend to act without thinking. Old people tend to think without acting. Young people are curious and like to experience different things. Old people are less enthusiastic about change. In fact, they are less enthusiastic about everything. The effect of anti-ageing technology is deeper than we might think. But as the science advances, we need to think about these changes now. "If this could ever happen, then we'd better ask what kind of society we want to get," says Daniel Callahan. "We had better not go anywhere near it until we have figure those problems out."

单选题She {{U}}started{{/U}} to clean the kitchen,