单选题I {{U}}notified{{/U}} him that my address had changed. A. informed B. observed C. mocked D. misled

单选题We were shocked to find that Mary didn't know her guest's name. A. frustrated B. disturbed C. relieved D. surprised

单选题It would be hazardous to invest so much.

单选题 下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} The world is known to us through many senses, not just hearing, smell, vision, and at close range, touch and taste. Our skins let us know whether the air is moist or dry, whether surfaces are wet without being sticky or slippery. From the uniformity of slight pressure, we can be aware how deeply a finger is thrust into water at body temperature, even if the finger is enclosed in a rubber glove that keeps the skin completely dry. Many other animals, with highly sensitive skins, appear to be able to learn still more about their environment. Often they do so without employing any of the five senses. By observing the capabilities of other members of the animal kingdom, we come to realize that a human being has far more possibilities than are utilized. We neglect ever so many of our senses in concentrating on the five major ones. At the same time, a comparison between animals and man draws attention to the limitations of each sense. The part of the spectrum(光谱)seen by color-conscious man as red is non-existent for honey-bees. But a bee can see far more in flowers than we, because the ultra-violet(紫外线)to which our eyes are blind is a stimulating(刺激的)part of the insect's spectrum, and, for honeybees at least, constitutes a separate color.

单选题Lack of Sleep Increases the Risk of Catching a Cold As cold season approaches, many Americans stock up on their vitamin C and Echinacea (紫锥花精油). But fallowing the age -old advice about catching up on sleep might be more important. Studies have demonstrated that poor sleep and susceptibility (易受影响) to colds go hand in hand, and scientists think it could be a reflection of the role sleep plays in maintaining the body's defenses. In a recent study for the Archives of Internal Medicine, scientists followed 153 men and women for two weeks, keeping mack of their quality and duration of sleep. Then, during a five - day period, they quarantined (进行检疫隔离) the subjects and exposed them to cold viruses. Those who slept an average of fewer than seven hours a night, it turned out, were three times as likely to get sick as those who averaged at least eight hours. Sleep and immunity, it seems, are tightly linked. Studies have found that mammals that require the most sleep also produce greater levels of disease - fighting white blood cells--but not red blood cells, even though both are produced in bone marrow (骨髓) and stem from the same precursor (前体物). And researchers at the Max Planck Institute for Evolutionary Anthropology have shown that species that sleep more have greater resistance against pathogens (病原体). "Species that have evolved longer sleep durations," the Planck scientists wrote, "appear to be able to increase investment in their immune systems and be better protected. /

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}} What Is Anthrax?{{/B}} There's been a lot of talk about anthrax on the news lately. Some people are worded that anthrax may be connected to terrorist attacks or that terrorists may spread the germ that{{U}} (1) {{/U}}the disease. Federal officials and police are investigating this and taking measures to protect us. In the meantime, it's important not to panic over anthrax. The chances that you and your family{{U}} (2) {{/U}}at risk are very tiny. One of the ways you can feel better is to learn about anthrax. When you know what it is and{{U}} (3) {{/U}}you can get it, it doesn't seem quite as scary. So, what{{U}} (4) {{/U}}is anthrax? Here are the facts on anthrax: Anthrax is a bacterial infection caused by a germ. Although it's most common in farm{{U}} (5) {{/U}}, like sheep, cows, pigs, horses, and goats, there's a very small chance that people can get it, too. Anthrax spores (a version of the germ in a protective shell that can live in the soil for years) cause the disease. People may get anthrax if they are exposed to anthrax{{U}} (6) {{/U}}. But here's the important part: just being exposed to these spores doesn't mean that a person will get{{U}} (7) {{/U}}. For people to get sick, they would have to breathe in thousands of these spores all the way into their{{U}} (8) {{/U}}. Or they'd have to eat meat contaminated with anthrax or handle{{U}} (9) {{/U}}that has anthrax spores. This may sound scary, but even when people come{{U}} (10) {{/U}}contact with the spores, it's unlikely that they'll get sick.{{U}} (11) {{/U}}the bacteria do not get into the skin, digestive tract, or lung, the disease won't develop. Anthrax is not spread from person to person the way the flu can spread from family member to{{U}} (12) {{/U}}member or classmate to classmate. Anthrax is very rare. Until recently, anthrax wasn't even talked about because it was so rare-- and it still{{U}} (13) {{/U}}! Even with all of the anthrax cases you are hearing about right now(and many of these suspected cases will turn out not to be anthrax), a person's chances of getting anthrax are about the{{U}} (14) {{/U}}as they were before you heard about anthrax on the news -- very, very low. If you still feel scared when you hear about anthrax, remember that it's extremely unlikely thatyou or your family or anyone you know will ever be{{U}} (15) {{/U}}to anthrax spores.

单选题How can we {{U}}reduce{{/U}} the risk of cancer? A. cut in B. cut down C. cut off D. cut out

单选题The atmosphere,a narrow band of gases surrounding the Earth,is maintained by gravitational pull.

单选题He emphasized a feasible plan which can be accepted by the both sides.

单选题It is useless to argue with him once he has made up his mind. A. settled B. solved C. said D. decided

单选题Excessive Demands on Young People Being able to multitask is hailed by most people as a welcome skill, but not according to a recent study which claims that young people between the ages of eight and eighteen of the so-called Generation M are spending a considerable amount of their time in fruitless efforts as they multitask. It argues that, in fact, these young people are frittering away as much as half of their time again as they would if they performed the very same tasks one after the other. Some young people are juggling an ever larger number of electronic devices as they study. At the same time that they are working, young adults are also surfing on the Internet, or sending out emails to their friends, and/or answering the telephone and listening to music on their iPods or on another computer. As some new device comes along it too is added to the list rather than replacing one of the existing devices. Other research has indicated that this multitasking is even affecting the way families themselves function as young people are too wrapped up in their own isolated worlds to interact with the other people around them. They can no longer greet family members when they enter the house nor can they eat at the family table. All this electronic wizardry is supposedly also seriously affecting young people's performance at university and in the workplace. When asked about their perception of the impact of modern gadgets on their performance of tasks, the overwhelming majority of young people gave a favorable response. The response from the academic and business worlds was not quite as positive. The former feel that multitasking with electronic gadgets by children affects later development of study skills, resulting in a decline in the quality of writing, for example, because of the lack of concentration on task completion. They feel that many undergraduates now urgently need remedial help with study skills. Similarly, employers feel that young people entering the workforce need to be taught all over again, as they have become deskilled. While all this may be true, it must be borne in mind that more and more is expected of young people nowadays; in fact, too much. Praise rather than criticism is due in respect of the way today's youth are able to cope despite what the older generation throw at them.

单选题The view from my bedroom window was absolutely spectacular .

单选题I know you have made all the {{U}}arrangements{{/U}} for the conference.

单选题Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near-starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical School in Boston, U.S., and his colleagues have been able to extend the lifespan (寿命) of mice by 18 per cent by blocking the rodent's (啮齿动物) increase of fat in specific cells. This suggests that thinness--and not necessarily diet--promotes long life in "calorie (热量卡) restricted" animals. "It's very cool work," says aging researcher Cynthia Kenyon of the University of California, San Francisco. "These mice eat all they want, lose weight and live longer. It's like heaven." Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown partly because few people are willing to submit to such a strict diet. But many researchers hope they will be able to trigger the same effect with a drug once they understand how less food leads to a longer life. One theory is that eating less reduces the increase of harmful things that can damage cells. But Kahn's team wondered whether the animals simply benefit by becoming thin. To find out, they used biology tricks to disrupt the insulin (胰岛素) receptor (受体) gene in lab mice, but only in their fat cells. "Since insulin is needed to help fat cells store fat, these animals were protected against becoming fat," explains Kahn. This slight genetic change in a single tissue had dramatic effects. By three months of age, Kahn's modified mice had up to 70 per cent less body fat than normal control mice, despite the fact that they ate 55 per cent more food per gram of body weight. In addition, their lifespan increased. The average control mouse lived 753 days, while the thin rodents averaged a lifespan of 887 days. After three years, all the control mice had died, but one-quarter of the modified rodents were still alive. "That they get these effects by just manipulating the fat cells is controversial," says Leonard Guarente of the Massachusetts Institute of Technology, who studies calorie restriction and aging. But Guarente says Kahn has yet to prove that the same effect is responsible for increased lifespan in calorie-restricted animals. "It might be the same effect or there might be two routes to long life," he points out, "and that would be very interesting./

单选题I will take up teaching this September.A. startB. get offC. captureD. pick up

单选题Having worked hard for a whole week, I am looking forward to the weekend.

单选题In a bullfight, it is the movement, not the color, of objects that arouses the bull.

单选题Once Daily Pill Could Simplify HIV Treatment Bristol-Myers Squibb and Gilead Sciences have combined many HIV drugs into a single pill. Sometimes the best medicine is more than one kind of medicine. Malaria, tuberculosis and HIV/AIDS, 1 , are all treated with combinations of drugs. But that can mean a lot of pill to take. It would be 2 drug companies combined all the medicines into a single pill, taken just once a day. Now, two companies say they have done that for people just 3 treatment for HIV, the virus that causes AIDS. The companies are Bristol-Myers Squibb and Gilead Science. They have 4 a single pill that combines three drugs currently on the market. Bristol-Myers Squibb sells one of them 5 the name of Sustiva. Gilead combined the 6 , Emtriva and Viread, into a single pill in two thousand four. Combining drugs involves more than 7 issues. It also involves issues of competition 8 the drugs are made by different companies. The new once-daily pill is the result of 9 is described as the first joint venture agreement of its kind in the treatment of HIV. In January the New England Journal of Medicine published a study of the new pill. Researcher compared its 10 to that of the widely used combination of Sustiva and Combivir. Combivir 11 two drugs, AZT and 3TC. The researchers say that after one year of treatment, the new pill suppressed HIV levels in more patients and with fewer 12 effects. Gilead paid for the study. Professor Joel Gallant at the Johns Hopkins School of Medicine in Baltimore, Maryland, led the research. He is a paid adviser to Gilead and Bristol-Meyers Squibb as well as the maker of Combivir, Glaxo Smith Kline. Glaxo Smith Kline reacted 13 the findings by saying that a single study is of limited value. It says the effectiveness of Combivir has been shown in each of more than fifty studies. The price of the new once-daily pill has not been announced. But Gilead and Bristol-Myers Squibb say they will provide it at reduced cost to developing countries. They plan in the next few months to ask the United States Food and Drug Administration to approve the new pill. There are limits to who could take it 14 the different drugs it contains. For example, 15 women are told not to take Sustiva because of the risk of birth disorders. Experts say more than forty million people around the world are living with HIV.

单选题Swedish is the {{U}}native{{/U}} language of most Swedes.

单选题We consume a lot more than we are able to produce. A. waste B. buy C. use D. sell