单选题Physical Exercise 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 Heath 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, burns 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 serf-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 workplace. 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We need to extract the relevant financial data.

单选题Her novel {{U}}depicts{{/U}} an ambitious Chinese. A.writes B.sketches C.describes D.indicates

单选题In the process, the light energy converts to heat energy.A. movesB. divertsC. changesD. conforms

单选题The high-speed trains can have a {{U}}major{{/U}} impact on travel preferences. A. force B. total C. small D. similar

单选题 A Desert Between Paul and Clara Paul had long promised to marry Clara. But at thirty-three he met and married Alice. Clara was driven mad. Paul was taken to court. The judge ordered him to pay Clara $600 because of the broken promise. Paul had to borrow the money from a moneylender. He agreed to pay back $5 a month—for twenty years. His wages at the time were $16 a month. Paul and Alice were poor but not unhappy. They had little enough food, certainly, even before the children began to arrive. Each month Paul paid $5 to the moneylender. He worked hard, never taking a holiday. In time, there were seven mouths to feed. Illness was always with them. It grew serious when the oldest child was eight. The years of hunger weakened the family, because each month Paul paid $5. The details of the sickness were ugly, but the result was this: after twelve years of family life, Paul was alone in the world. He lived alone except for memories. Work was not now a god for him: it was a painkiller. Each month he paid, and in time the twenty years ended. From that moment his wages were his own. One day, it was a holiday went to the seaside. He sat down on a seat by the sea. A middle-aged woman came and sat down near him. They recognized each other at once. The woman said, "The $600 has been in the bank since the day it was paid to me. It is now $6,000, and I have kept it for you. Will you let me share it with you?" "No," said Paul, gently. "Each thousand is a lost life in a desert between us. It can never bring any happiness."

单选题"I didn"t mean to upset you," he said mildly .

单选题{{B}}第二篇{{/B}} {{B}}Eat to Live{{/B}} A meager(不足的)diet may give you health and long life, but it's not much fun—and it might not even be necessary. We may be able to hang on to most of that youthful vigor even if we don't start to diet until old age. Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse's liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation(恢复活力)won't reverse other damage caused by time for the mouse, but could help its liver metabolize(新陈代谢)drugs or get rid of toxins(毒素). Spindler's team fed three mice a normal diet for their whole lives, and fed another three on half-rations. Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old—equivalent to about 70 human years. The researchers checked the activity of 11,000 genes from the mouse livers, and found that 46 changed with age in the normally fed mice. The changes were associated with things like inflammation and free radical production(自由基)—probably bad news for mouse health. In the mice that had dieted all their lives, 27 of those 46 genes continued to behave like young genes. But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 per cent of these gene changes. "This is the first indication that thee effects kick in pretty quickly," says Huber Warner from the National Institute on Aging near Washington, D. C. No one yet knows if calorie works in people as it does in mice, bus Spindler is hopeful. "There's attracting and tempting evidence out there that it will work," he says. If it does work in people, there might be good reasons for rejuvenating the liver. As we get older, our bodies are less efficient at metabolizing drugs, for example. A brief period of time of dieting, says Spindler, could be enough to make sure a drug is effective. But Spindler isn't sure the trade-off(交换)is worth it. "The mice get less disease, they live longer but they're hungry," he says. "Even seeing what a diet does, it's still hard to go to a restaurant and say: "I can only eat half of that'." Spindler hopes we soon won't need to diet at all. His company, Life Span Genetics in California, is looking for drugs that have the effects of calorie restriction.

单选题This kind of animals are on the verge of extinction, because so many are being killed for their fur. A. drying up B. dying out C. being exported D. being transplanted

单选题Pure feldspar is a colorless, transparent mineral, but impurities commonly make it opaque and colorful.______

单选题 Scientists Develop Ways of Detecting Heart Attack German researchers have (1) a new generation of defibrillators and early warning software aimed at offering heart patients greater protection (2) sudden death from cardiac arrest. In Germany alone around 100,000 people die annually as a result of cardiac arrest and many of these cases (3) by disruption to the heart's rhythm. Those most at risk are Patients who have (4) suffered a heart attack and for years the use of defibrillators has proved useful in diagnosing (5) disruptions to heart rhythms and correcting them automatically by intervening within seconds. These devices (6) a range of functions such as that of pacemaker. Heart specialists at Freiburg's University Clinic have now achieved a breakthrough with all implanted defibrillator (7) of generating a six-channel electrocardiogram(ECG) within the body. This integrated system allows early diagnosis of (8) blood-flow problems and a pending heart attack. It will be implanted in patients for the first time this year. Meanwhile, researchers at the Fraunhofer Institute for Applied Mathematics in Kaiserslautern have developed new computer software that renders the evaluation of ECG data (9) . The overwhelming (10) of patients at risk will not have an implanted defibrillator and must for this reason undergo regular ECGs. "Many of the current programs only (11) into account a linear correlation of the data. We are, however, making use (12) a non-linear process that reveals the chaotic patterns of heart beats as an open and complex system." Hagen Knaf says." (13) changes in the heart beats over time can be monitored and individual variations in patients taken into account." An old study of ECG data, based (14) 600 Patients who had suffered a subsequent heart attack, enabled the researchers to compare risks and to show (15) the new software evaluates the data considerably better.

单选题Writing is a slow process,requiring {{U}}plenty of{{/U}} thought, time and effort。

单选题Their talents are not only enormous but durable.A. elasticB. lastingC. flexibleD. suitable

单选题 Is Your Child's Stomach Pain All in His Head? We all know there are times that kids seem to complain {{U}} {{U}} 1 {{/U}} {{/U}}a stomachache to get out of chores or going to school. Don't be so sure that the pain they {{U}} {{U}} 2 {{/U}} {{/U}}is all in their minds. We're learning more now about a condition {{U}} {{U}} 3 {{/U}} {{/U}}"functional abdominal pain" that is experienced by millions of kids every day. Like many teenagers, Kyle Brust makes it a point to do his homework as {{U}} {{U}} 4 {{/U}} {{/U}}as he gets home. Unlike most, Kyle often did this with a terrible stomachache. In fact, the {{U}} {{U}} 5 {{/U}} {{/U}}often started while he was at school, but getting help there was getting harder. "Some of my teachers wouldn't let me go, because I'd asked so many times before and they thought I was trying to get out of {{U}} {{U}} 6 {{/U}} {{/U}}," says Kyle. Kyle's mom Marilyn says she couldn't blame the {{U}} {{U}} 7 {{/U}} {{/U}}. After all, she'd taken him to the doctor several times herself, and even they couldn't find anything {{U}} {{U}} 8 {{/U}} {{/U}}. "You know, you're running the tests and nothing's coming up. So, is it in his head, is he just an extremely stressful child? It's just frustrating {{U}} {{U}} 9 {{/U}} {{/U}}we're not finding any answers," says Marilyn. It turns out Kyle was suffering from a condition known {{U}} {{U}} 10 {{/U}} {{/U}}functional abdominal pain, that affects as many as one out of every ten kids in this country. Even {{U}} {{U}} 11 {{/U}} {{/U}}the cause of the pain may not be obvious, there are real consequences. "It really does hurt, and these kids really do suffer," says Dr. Campo, MD at Nationwide Children's Hospital. To help {{U}} {{U}} 12 {{/U}} {{/U}}, Campo is looking into a new approach. He's conducting clinical trials of an antidepressant that changes the way the body handles a chemical called serotonin. In a preliminary study, Dr. Campo found that in about eight out of ten {{U}} {{U}} 13 {{/U}} {{/U}}, the drug normally used to treat emotional pain worked to ease the pain in the {{U}} {{U}} 14 {{/U}} {{/U}}. "We think about it as being important in anxiety and depression and that's all quite true, but what's really interesting is that 95% of our body's serotonin is in our gut," says Campo. Campo believes these kids have extremely sensitive intestines, and controlling the effects of serotonin may {{U}} {{U}} 15 {{/U}} {{/U}}ease the pain. It seemed to work for Kyle, who is now completely pain free for the first time in years.

单选题{{U}}Subterranean{{/U}} streams have cut through limestone to form miles of passages and caves such as Kentucky's Mammoth Cave.

单选题The movie has a {{U}}satisfying{{/U}} ending. A.pleasing B.sad C.interesting D.horrific

单选题 Look After Your Voice Often speakers at a meeting experience dry mouths and ask for a glass of water. You can solve the problem by activating the saliva in you mouth. First gently bite the edges of your tongue with your teeth. Or, press your entire tongue to the bottom of your mouth and hold it there until the saliva flow. Or you can imagine that you are slicing a big juicy lemon and sucking the juice. Before you begin your talk, be kind to your voice. Avoid milk or creamy drinks which coat your throat. Keen your throat wet by drinking a little sweetened warm tea or diluted fruit juice. If you sense that you are losing your voice, stop talking completely. Save your voice for your speech. You may feel foolish using paper to write notes, but the best thing you can do is to rest your voice. If you need to see a doctor, perhaps you can get some advice from a professional singer. In the meantime, do not even talk in a low voice. What about drinking alcohol to wet your throat? I advice you not to touch alcohol before speaking. The problem with alcohol is that one drink gives you a little confidence. The second drink gives you even more confidence. Finally you will feel all-powerful and you will feel you can do everything, but in fact your brain and your mouth do not work together properly. Save the alcohol until you finish speaking. Perhaps you want to accept the advice, but you may wonder if you can ever change the habits of a lifetime. Of course you can. Goethe, who lived before indoor skating rinks or swimming pools, said, "We learn to skate in the summer and swim in the winter." Take this message to heart and give yourself time to develop your new habits. If you are willing to change, you will soon be able to say that you will never forget these techniques because they became a part of your body.

单选题{{U}}Alternative{{/U}} sources of protein must be found when meat and fish are not available.

单选题It was obvious that she was not going home.

单选题I think you were {{U}}wise {{/U}}to leave when you did.