单选题Since the 1950's, literary critics have attempted to answer the question: When did children's literature first emerge as a distinct literary genre?A. improveB. appearC. conformD. respond

单选题{{B}}第二篇{{/B}} There may be a good reason why some people are not able to stop smoking cigarettes. A new study found that people who suffer from depression were two times as likely to fail when they tried to stop smoking. Alexander Glassman presented the findings recently during the yearly meeting of the American Psychiatric Association. Doctor Glassman is the director of an antismoking center at Columbia University in New York City. His study examined 100 smokers who have a history of depression. People with depression suffer periods of extreme sadness. The researchers studied people who have succeeded and those who have failed in their efforts to stop smoking. The study found that people who did stop smoking were two times as likely to suffer from depression again within six months as those who continued to smoke. Doctor Glassman says smokers who are depressed use tobacco to make themselves feel better. But, he says people with depression seem to have a much harder time stopping than non-depressed smokers. So, drugs to fight depression are now also being used to help people stop smoking. Doctors say the most effective one is called Buproprion. Buproprion mainly affects the brain chemical dopamine(多巴胺). nicotine(尼古丁) is a substance in tobacco that also affects dopamine. Buproprion helps people stop smoking because it eases the body's desire for nicotine. Doctor Glassman says the drug does not make people stop smoking. But it makes it easier for those who want to stop.

单选题There was no alternative but to close the road.

单选题We need toU extract/U the relevant financial data．

单选题A {{U}}reporter{{/U}} from the local paper asked for details of the accident.

单选题The Airclear features a convenient, slide - control of fragrance dispenser; a fan that is powerful yet whispers quiet. Ruggedly constructed, the AirClear is the first and only personal air purifier that's both full featured and value priced. Regularly $ 69.95. Now $ 59.95. That's a $10. 00 savings. Save $ 25.00 when ordering two! The current price of the air purifier isA. $10.00B. $25.00C. $59.95D. $69.95

单选题The agenda will be choosen through an {{U}}ongoing{{/U}} process of consultations with officials of governments and international organizations.

单选题The largest part of our revenue comes from Consumer and Salons activities.A. expenditureB. costC. amountD. income

单选题Lead Poisoning: A Silent Epidemic How much lead is harmful? Until the 1970s, exposure to lead was considered dangerous only at blood levels associated with extreme symptoms of poisoning: convulsions (惊厥), brains swelling, acute kidney disease, stomach pains and hallucinations (幻觉). But low -level lead poisoning can cause symptoms that, while subtle, are no less serious. As a result, the CDC has continually lowered the point at which patients should be treated for lead poisoning. One of the most influential study of lead' s low - level effects was published by Herbert Needleman, professor of psychiatry at the University of Pittsburgh Medical School. Testing first and second grade students in the Boston area, he found the lowest I. Q. , academic achievement, language skills and attention span among children with the highest tooth levels (起损害作用的量) of lead. "None of their lead levels exceed the CDC's 1979 toxicity threshold. "Says Paul Mushak, an expert on toxic substances, "Our children and people in the risk groups shouldn't be held hostage (成为人质) to a preventable disease. " What can be done? In some cases the treatment for low - level lead poisoning can be as simple as removing the source of pollution, for example, to stop drinking tap water in some cases. But no one knows the long - term effects of lead poisoning may be. The small amount of research done so far suggest that intellectual impairment may be irreversible (不可逆的). Nor is it always easy to know what water is safe. Jeanne Briskin, a policy analyst with the EPA, reports that in uncounted schools across the country water in drinking fountains may be lead - contaminated. Even the child whose parents have removed the lead threat at home may still be gulping (吞咽)the metal every school day. The American Academy of Pediatrics recommends that children be screened for lead poisoning at 12 months of age, with their doctor to determine follow - up examinations; men at risk for hypertension (高血压) should also have their blood lead levels tested. Prevention is even more important. Public -health specialists have intensified efforts to control the pollutant. Meanwhile, for the individual, that means testing potential household sources of contamination.

单选题They soon began to investigate the cause of the fire.A. affirmB. inventC. examineD. deny

单选题{{B}}第三篇{{/B}} {{B}}Happy Therapy (诊疗){{/B}} Norman Cousins was a businessman from the United States who often traveled around the world on business. He enjoyed his work and traveling. Then, after returning to the United States from a busy and tiring trip to Russia, Mr. Cousins got sick. Because he had pushed his body to the limit of its strength on the trip, a chemical change began to take place inside him. The material between his bones became weak. In less than one week after his return, he could not stand. Every move that he made was painful. He was not able to sleep at night. The doctors told Mr. Cousins that they did not know how to cure his problems and he might never get over the illness. Mr. Cousins, however, refused to give up hope. Mr. Cousins thought that unhappy thoughts were causing bad chemical changes in his body. He did not want to take medicine to cure himself. Instead, he felt that happy thoughts or laughter might cure his illness. He began to experiment on himself while still in the hospital by watching funny shows on television. Mr. Cousins quickly found that ten minutes of real laughter during the day gave him two hours of pain-free sleep at night. Deciding that the doctors could not help him, Mr. Cousins left the hospital and checked into a hotel room where he could continue his experiments with laughter. For eight days, Mr. Cousins rested in the hotel room watching funny shows on television, reading funny books, and sleeping whenever he felt tired. Within three weeks, he felt well enough to take a vacation to Puerto Rico where he began running on the beach for exercise. After a few months, Mr. Cousins returned to work. He had laughed himself back to health.

单选题She exhibited great powers of endurance during the climb.

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

单选题Engineering Ethics Engineering ethics is attracting increasing interest in engineering universities throughout the nation, at Texas A~M University, evidence of this interest in professional ethics culminated in the creation of a new course in engineering ethics, as well as a project funded by the National Science Foundation to develop material for introducing ethical issues into required undergraduate engineering courses. A small group of faculty and administrators actively supported the growing effort at Texas A~.M, yet this group must now expand to meet the needs of increasing numbers of students wishing to learn more about the value implications of their actions as professional engineers. The increasing concern for the value dimension of engineering is, at least in part, a result of the attention that the media has given to cases such as the Challenger disaster, the Kansas City Hyatt-Regency Hotel walkways collapse, and the Exxon oil spill. As a response to this concern, a new discipline, engineering ethics, is emerging. This discipline will doubtless take its place alongside such well-established fields as medical ethics, business ethics, and legal ethics. The problem presented by this development is that most engineering professors are not prepared to introduce literature in engineering ethics into their classrooms. They are most comfortable with quantitative concepts and often do not believe they are qualified to lead class discussions on ethics. Many engineering faculty members do not think that they have the time in an already overcrowded syllabus to introduce discussions on professional ethics, or the time in their own schedules to prepare the necessary material. Hopefully, the resources presented herein will be of assistance.

单选题More than 80 percent of US adults have a less than 10 - percent risk of developing heart disease in the next 10 years, according to a report in the Journal of the American College of Cardiology. Just 3 percent have a risk that exceeds 20 percent. Only 3 percent of US adults have a more than 10 percent 10 year risk of heart disease.A. RightB. WrongC. Not mentioned

单选题Mysterious Nazca Drawings One of the most mysterious archaeological spectacles in the world is the immense complex of geometrical symbols, giant ground-drawings of birds and animals, and hundreds of long, ruler-straight lines, some right across mountains, which stretch over 1,200 square miles of the Peruvian tablelands, at Nazca. Nazea was first revealed to modern eyes in 1926 when three explorers looked down on the desert from a hillside at dusk and briefly saw a Nazca line highlighted by the rays of the sun. But it was not until the Peruvian airforce took aerial photographs in the 1940s that the full magnificence of the panorama was apparent. Hundreds of what looked like landing strips for aircraft were revealed. There were eighteen bird-like drawings, up to 400 feet long; four-sided figures with two lines parallel; and long needle-like triangles which ran for miles. Among the many abstract patterns were a giant spider, a monkey, a shark, all drawn on the ground on a huge scale. The scale is monumental, but from the ground almost invisible and totally incomprehensible. The amazing fact about Nazca, created more than 1,500 years ago, is that it can only be appreciated if seen from the air. Many, therefore, regarded it as a prehistoric landing ground for visitors from outer space, but Jim Woodman, an American explorer, who was long fascinated by the mystery of Nazca, had a different opinion. He believed that Nazca only made sense if the people who had designed and made these vast drawings on the ground could actually see them, and that led him to the theory that the ancient Peruvians had somehow learned to fly, as only from above could they really see the extent of their handiwork. With this theory in mind, he researched into ancient Peruvian legends about flight and came to the conclusion that the only feasible answer was a hot-air balloon. To prove his theory, Woodman would have to make such a thing using the same fabrics and fibers that would have been available to the men of Nazca at the time. He started by gathering information from ancient paintings, legends, books and archaeological sites. After many attempts, Woodman built a balloon-type airship. It took him into the air, letting him have the sensation he had never had from viewing the same ground that he had seen many times. His flight was a modern demonstration of an ancient possibility.

单选题The policeman wrote down all the {{U}}particulars{{/U}} of the accident. A. secrets B. details C. benefits D. words

单选题Most Adults in U.S. Have Low Risk of Heart Disease More than 80 percent of U.S. adults have a less than 10-percent risk of developing heart disease in the next 10 years, according to a report in the Journal of the American College of Cardiology. Just 3 percent have a risk that exceeds 20 percent. "I hope that these numbers will give physicians, researchers, health policy analysts, and others a better idea of how coronary heart disease is distributed in the U.S. population," lead author Dr. Earl S. Ford, from the Centers for Disease Control and Prevention in Atlanta, said in a statement. The findings are based on analysis of data from 13,769 subjects, between 20 and 79 years of age, who participated in the Third National Health and Nutrition Examination Survey from 1988 to 1994. Overall, 82 percent of adults had a risk of less than 10 percent, 15 percent had a risk that fell between 10 to 20 percent, and 3 percent had a risk above 20 percent. The proportion of subjects in the highest risk group increased with advancing age, and men were more likely than women to be in this group. By contrast, race or ethnicity had little effect on risk distributions. Although the report suggests that most adults have a low 10-year risk of heart disease, a large proportion have a high or immediate risk, Dr. Daniel S. Berman, from Cedars-Sinai Medical Center in Los Angeles, and Dr. Nathan D. Wong, from the University of California at Irvine, note in a related editorial. Aggressive treatment measures and public health strategies are needed to shift the overall population risk downward, they add.

单选题The parents have to restrain their daughter from running out into the street. A. disallow B. reduce C. prevent D. confine

单选题The roof fell ______ he succeeded in saving his baby.A. afterB. asC. beforeD. until