单选题The little girl {{U}}grasped{{/U}} her mother's arm as she crossed the street.

单选题It"s impolite to cut in when two persons are holding a conversation.

单选题The American antelope possesses remarkable powers of sight and can pinpoint potential danger at tremendous distances.A. spotB. relayC. attachD. sustain

单选题Researchers in the Netherlands used ferrets to study the transmission of H1N1 and found that the disease was efficiently transmitted by small airborne particles. An earlier study examining a different flu strain in guinea pigs found that the animals did not pick up the vires from contaminated cages. That suggests that you're not really safer from the flu virus if you scrub your hands, paws, or cages because the virus travels through the air. While there's not enough evidence to conclusively say the flu works the same way for humans, the current research suggests that the H1N1 flu travels mostly by air. not via hand - to - hand contact - and therefore won't be prevented through hand - washing. According to the study of researchers in the Netherlands, H1N1 viruses are transmittedA. through hand - to - hand contact.B. through the air.C. through skin contact.D. through coughin

单选题Smoking is considered dangerous to the health. Our tobacco--seller, Mr. Johnson, therefore, always asks his customers, if they are very young, whom the cigarettes are bought (51) . One day, a little girl whom he had never seen before walked (52) into his shop and demanded twenty cigarettes. She had the (53) amount of money in her hand and seemed very sure of herself. Mr. Johnson was so (54) by her confident manner that he (55) to ask his usual question. (56) , he asked her what kind of cigarettes she wanted. The girl replied (57) and handed him the money. While he was giving her the change, Mr. Johnson said laughingly that (58) she was so young she should (59) the packet in her pocket in case a policeman saw it. (60) , the little girl did not seem to find this very funny. Without (61) smiling she took the (62) and walked towards the door. Suddenly she stopped, turned (63) , and looked steadily at Mr. Johnson. There was a moment of silence and the tobacco-seller (64) what was going to say. All at once, in a clear, (65) voice, the girl declared, " My dad is a policeman," and with that she walked quickly out of the shop.

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

单选题The city has decided to do away with all the old buildings in its centre. A. get rid of B. set up C. repair D. paint

单选题She's extremely competent and {{U}}industrious{{/U}}. A. hardworking B. honest C. objective D. independent

单选题Milk That Paid a Medical Bill One day, a poor boy who was selling goods from door to door to pay his way through school found he had only one thin dime (10分钱) left, and he was hungry. He decided he would ask for a meal at the next house. However, he lost his nerve when a lovely young woman opened the door. Instead of a meal he asked for a drink of water. She thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, "How much do I owe you? You don"t owe me anything," she replied. "Mother has taught us never to accept pay for a kindness." He said, "Then I thank you from my heart." As Howard Kelly left that house, he not only felt stronger physically, but his faith in God and man was strong also. He had been ready to give up and quit. Years later that young woman became critically ill. The local doctors were baffled (感到困惑). They finally sent her to the big city, where they called in specialists to study her rare disease. Dr. Howard Kelly was called in for the consultation. When he heard the name of the town she came from, a strange light filled his eyes. Immediately he rose and went down the hall of the hospital to her room. Dressed in his doctor"s gown he went in to see her. He recognized her at once. He went back to the consultation room determined to do his best to save her life. From that day he gave special attention to the case. After a long struggle, the battle was won. Dr. Kelly requested the business office to pass the final bill to him for approval. He looked at it; then wrote something on the edge and the bill was sent to her room. She feared to open it, for she was sure it would take the rest of her life to pay for it all. Finally she looked, and something caught her attention on the side of the bill. She read these words: "Paid in full with one glass of milk." Tears of joy flooded her eyes as her happy heart prayed: "Thank You, God, that Your love has spread abroad through human hearts and hands."

单选题Her behavior is extremely childish. A. simple B. immature C. beautiful D. foolish

单选题Smoking Can Increase Depressive Symptoms in Teens While some teenagers may puff on cigarettes to "self-medicate" against the blues, scientists at the University of Toronto and the University of Montreal have found that smoking may actually (51) depressive symptoms in some teens. "This observational study is one of the few to examine the perceived (52) benefits of smoking among teens," says lead researcher Michael Chatom, a research associate at the Ontario Tobacco Research Unit of the University of Toronto. " (53) cigarettes may appear to have self-medicating (54) or to improve mood, in the long term we found that teens who started to smoke reported higher depressive symptoms." As part of the study, some 662 high school teenagers completed up to 20 questionnaires (55) their use of cigarettes to affect mood. Secondary schools were selected to provide a mix of French and English participants, urban and rural schools, and schools (56) in high, moderate and low socioeconomic neighborhoods. Participants were divided into three (57) : never smokers; smokers who did not use cigarettes to self-medicate, improve mood or physical (58) ; smokers who used cigarettes to self-medicate. Depressive symptoms were measured using a scale that asked how felt too fired to do things: had (59) going to sleep or staying (60) ; felt unhappy, sad, or depressed; felt hopeless about the future; felt vexed, antsy or tense; and worried too much about things. "Smokers who used cigarettes as mood (61) had higher risks of elevated depressive symptoms than teens who had never smoked," says co-researcher Jennifer O'Loughlin, a professor at the University of Montreal Department of Social and Preventive Medicine. "Our study found that teen smokers who reported emotional benefits from smoking are at higher risk of (62) depressive symptoms." (63) between depression and smoking exists (64) among teens that use cigarettes to feel better. "It's (65) to emphasize that depressive symptom scores were higher among teenagers who reported emotional benefits from smoking after they began to smoke," says Dr. Chaiton.

单选题When Paul met Clara again 20 years later, he decided

单选题It is postulated that a cure for the disease will have been found by the year 2000.A. challengedB. assumedC. deductedD. decreed

单选题With a new Administration promising much needed reform in the way health care is accessed, delivered and reimbursed, legislators, health officials, doctors and patients see this as a rare opportunity, a sweet spot in which national need could meet national will and we could actually fix a system that seems to be costing us more and more but delivering less and less. The improvements can't come too soon. In spite of our gleaming hospitals and cutting - edge technology that can detect the tiniest tumors and repair the most complex organ, on some basic health measures the U. S. is starting to fall behind--far behind. What does the author think of the present health - care system?A. SatisfactoryB. DissatisfactoryC. EfficientD. Hopeless.

单选题If we leave now, we should miss the traffic.

单选题His sole {{U}}motive{{/U}} was to make her happy. A. aim B. argument C. capability D. pursuit

单选题.It is laid down in the regulations that all members must carry their membership cards at all times.

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}}A Health Profile (概貌){{/B}} A health profile is, a portrait of all of the factors that influence your health. To draw your health pro- file, you will{{U}} (51) {{/U}}what diseases run in your family, what health hazards you may be exposed to{{U}}(52) {{/U}}work, how your daily{{U}} (53) {{/U}}compares to the recommended standards, how much time per week you{{U}} (54) {{/U}}exercising and what type of exercise you engage{{U}} (55) {{/U}}, how stressful your work and family environments are, what kinds of illnesses you get regularly, and{{U}} (56) {{/U}}or not you have any one Of a number of. addictions.{{U}} (57) {{/U}}this portrait, you should have a checkup to determine how your blood, heart, and lungs are functioning. This checkup will serve{{U}} (58) {{/U}}a baseline, to which you can then compare later tests. {{U}}(59) {{/U}}this profile is thoroughly drawn, you can begin to think about setting health priorities based{{U}} (60) {{/U}}your particular portrait. For example, if you drink two martinis (马提尼酒) every evening, have a high—stress{{U}} (61) {{/U}}, are overweight, smoke a pack of cigarettes a day, and use marijuana (大麻烟) occasionally on weekends, you should quit smoking first, followed{{U}} (62) {{/U}}losing the excess weight, reducing the stress of your job, giving up your marihuana habit, and then finally giving some{{U}} (63) {{/U}}to those martinis if you, want to prevent first cancer, and then heart disease. Even for the youthful working person who has never been sick a day in his life, who is{{U}} (64) {{/U}}excellent health, a good look at all health habits and at work and home environments any suggest changes that will{{U}} (65) {{/U}}him in the future.

单选题The Weaver Ants in Africa The humble but industrious ant has long served as a metaphor for the economic virtues of simplicity, parsimony and diligence. But in the case of weaver ants in Africa, this description may be more than just a metaphor. According to Paul van Mele of the Consultative Group on International Agricultural Research and his colleagues, African mango farmers could increase their harvests by as much as two-thirds with the help of these doughty insects. Mangoes in Africa, as elsewhere, often fall prey to fruit flies, which destroy about 40% of the continent"s crop. In fact, fruit flies are so common in African mangoes that America has banned their import altogether, to protect its own orchards. African farmers, meanwhile, have few practical means to defend their fruit. Chemical pesticides are expensive. And even for those who can afford them they are not that effective since, by the time a farmer spots an infestation, it is too late to spray. Added to that, spraying tall trees is a much more complicated and unhealthy business than treating low-growing fruit and vegetables. Agricultural scientists have also looked at controlling fruit flies with parasitic wasps. But the most common ones kill off only about one fly in 20, leaving plenty of survivors to go on the rampage. Lethal traps baited with fly-attracting pheromones are another option. But they, too, are expensive. Moreover, all these methods require farmers to detect the presence of fruit flies, and to identify them as the main threat to their crop—no mean feat when most of the action is taking place in dense, leafy canopies ten metres off the ground. Instead, most farmers simply harvest their fruit early, when it is not yet fully ripe. This makes it less vulnerable to the flies, but also less valuable. Farmers whose trees are teeming with weaver ants, however, do not need to bother with any of this. In a survey of several orchards in Benin, Dr van Mele and his colleagues found an average of less than one fruit-fly pupa in each batch of 30 mangoes from trees where weaver ants were abundant, but an average of 77 pupae in batches from trees without weaver ants. The weaver ants, it turns out, are very thorough about hunting down and eating fruit flies, as well as a host of other pests. The only drawback is the ants" painful bite, which can be avoided by harvesting fruit with poles, rather than climbing trees. Weaver ants have been used for pest control in China and other Asian countries for centuries. The practice has also been adopted in Australia. But Dr van Mele argues that it is particularly suited to Africa since weaver ants are endemic to the mango—growing regions of the continent, and little training or capital is needed to put them to work. All you need do is locate a suitable nest and run string from it to the trees you wish to protect. The ants will then quickly find their way to the target. Teaching a group of farmers in Burkina Faso to use weaver ants in this way took just a day. Those farmers no longer use pesticides to control fruit flies, and so are able to market their mangoes as organic to eager European consumers, vastly increasing their income. The ants, so to speak, are on the march.

单选题Once-daily Pill Could Simplify HIV Treatment Bristol-Myers 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, for example, are all treated with (51) of drugs. But that can mean a lot of pills to take. It would be (52) if 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 (53) treatment for HIV, the virus that causes AIDS. The companies are Bristol-Myers Squibb and Gilead Sciences. They have (54) a single pill that combines three drugs currently on the market. Bristol-Myers Squibb sells one of them (55) the name of Sustiva. Gilead combined the (56) , Emtriva and Viread, into a single pill in two thousand four. Combining drugs involves more than (57) issues. It also involves issues of competition (58) the drugs are made by different companies. The new once-daily pill is the result of (59) 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. Researchers compared its (60) to that of the widely used combination of Sustiva and Combivir. Combivir (61) 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 (62) side 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, GlaxoSmithKline. Glaxo Smith Kline reacted (63) 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 (64) the new pill. There are limits to who could take it because of the different drugs it contains. For example, (65) 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.