单选题This is especially true in today's extremely {{U}}harsh{{/U}} economic climate.

单选题Guests were {{U}}scared{{/U}} when the bomb exploded. A.frightened B.killed C.endangered D.rescued

单选题Mary has blended the ingredients.

单选题Some children do not like school. In Japan that familiar dislike has reached alarming proportions. About 50,000 unhappy youngsters a year (out of a total schoolage population of 20 million) suffer what Japanese behavioral experts call school phobia. School phobia is distinguished from other common childhood and adolescent psychological and emotional disorders by the patient's reaction to, and fear of, the idea of going to school. A doctor on a house call found a thirteen -year- old Tokyo boy who had not been to school in more than a year. He lived in a darkened room, receiving his food through a narrow opening under the door and lashing out violently at his parents if they came too close. Once the boy was placed in a psychiatric ward for treatment, he again became an open, seemingly healthy youngster. When he was sent home, however, his symptoms returned, and he was never able to go back to school. School phobia can be cured, usually with tranquilizers and psychological methods. Rehabilitation takes about two years. Yet victims who are put in clinics or mental wards often prefer to stay there. Their day is filled with activities liking knitting, painting, music, free time, and sports. The purpose of paragraph 2 is toA. show the large number of victims of school phobia.B. show that the problem can be cured.C. bring out the writer's point of view.D. present an example of school phobi

单选题The word "secured "in the last paragraph is closes in meaning to _______.

单选题He spoke in a temperate manner, not favoring either side especially.A. respectableB. moderateC. politeD. prudent

单选题Medicine Award Kicks off Nobel Prize Announcements Two scientists who have won praise for research into the growth of cancer cells could be candidates for the Nobel Prize in medicine when the 2008 winners are presented on Monday, kicking off six days of Nobel announcements. Australian-born US citizen Elizabeth Blackburn and American Carol Greider have already won a series of medical honors for their enzyme (酶) research and experts say they could be among the front-runners for a Nobel. Among the pair"s possible rivals are Frenchman Pierre Chambon and Americans Ronald Evans and Elwood Jensen, who opened up the field of studying proteins called nuclear hormone receptors (受体). As usual, the tight-lipped award committee is giving no hints about who is in the running before presenting its decision in a news conference at Stockholm"s Karolinska Institute. Alfred Nobel, the Swede who invented dynamite (炸药), established the prizes in his will in the categories of medicine, physics, chemistry, literature and peace. The economics prize is technically not a Nobel but a 1968 creation of Sweden"s central bank. Nobel left few instructions on how to select winners, but medicine winners are typically awarded for a specific breakthrough rather than a body of research. Hans Jornvall, secretary of the medicine prize committee, said the 10 million kronor (瑞典克朗) (US $1.3 million) prize encourages groundbreaking research but he did not think winning it was the primary goal for scientists. "Individual researchers probably don"t look at themselves as potential Nobel Prize winners when they"re at work," Jornvall told The Associated Press. "They get their kicks from their research and their interest in how life functions." In 2006, Blackburn, of the University of California, San Francisco, and Greider, of Johns Hopkins University in Baltimore, shared the Lasker prize for basic medical research with Jack Szostak of Harvard Medical School. Their work set the stage for research suggesting that cancer cells use telomerase (端粒酶) to sustain (维持) their uncontrolled growth.

单选题Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He"s a professor of solid-state physics at Uppsala University in Sweden. "It"s contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they"re stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In winter, cold air leaks in. When it"s hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it"s completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory". All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different."

单选题He has trouble understanding that other people judge him by his social skills and conduct.

单选题{{B}}第三篇{{/B}} {{B}}Exercise Lowers Employers' Health Costs{{/B}} Companies can save millions in health-care costs simply by encouraging their employees to exercise a little bit, researchers reported on Friday. They said obese (肥胖的) employees had higher health-care costs, but lowered those expenses by exercising just a couple of times a week -- without even losing any weight. Feifei Wang and colleagues at the University of Michigan studied 23,500 workers at General Motors. They estimated that getting the most sedentary (惯于久坐的) obese workers to exercise would have saved about $790,000 a year, or about 1.5 percent of health-care costs for the whole group. Company-wide, the potential savings could reach $7.1 million per year, they reported in the Journal of Occupational and Environmental Medicine. Of the whole group of workers, about 30 percent were of normal weight, 45 percent were overweight (超重的), and 25 percent were obese. Annual health-care costs averaged $2,200 for normal weight, $2,400 for the overweight, and $2,700 for obese employees. But among workers who did no exercise, health-care costs went up by at least $100 a year, and were $3,000 a year for obese employees who were sedentary. But adding two or more days of light exercise -- at least 20 minutes of exercise or work hard enough to increase heart rate and breathing --lowered costs by on average $500 per employee a year, the researchers found.

单选题The nursing vocation, as we know it today, came into being at the beginning of this century.A. professionB. societyC. philosophyD. uniform

单选题Some students lose marks in their examinations simply because they don't read questions carefully.A. easilyB. quicklyC. justD. frequently

单选题From my standpoint, this thing is just ridiculous. A. field 　C. knowledge B. point of view　D. information

单选题We cannot permit such conduct .

单选题When does the next train depart ?

单选题The second injection should only have been given once the first drug had Utaken effect/U.

单选题Cancer is more treatable if it is detected

单选题Exposure to the sun can accelerate the ageing process.

单选题Color changes in chameleons seem to be caused by environmental temperature as well as by other external stimuli.

单选题Moods, say the experts, are emotions that tend to become fixed, influencing one's outlook for hours, days or even weeks. That's great if your mood is a pleasant one, but a problem if you are sad, anxious, angry or simply lonely. Perhaps the best way to deal with such moods is to talk them out; sometimes, though, there is no one to listen. Modern pharmacology(药理学)offers an abundance of tranquilizers(安眠药), anti-depressants and anti-anxiety drugs. What many people don't realize, however, is that scientists have discovered the effectiveness of several non-drug approaches to make you loose from an unwanted mood. These can be just as useful as drugs, and have the added benefit of being non-poisonous. So next time you feel out of sorts, don't head for the drug-store, try the following approach. Of all the mood-altering self-help techniques, aerobic(增氧健身的)exercise seems to be the most efficient cure for a had mood. "If you could keep the exercise, you'd be in high spirits," says Kathryn Lance, author of Running for Health and Beauty. Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as a mood-raiser. Physical exertion such as housework, however, does little. The key is aerobic exercise--running, cycling, walking, swimming or other repetitive and sustained activities that boost the heart rate, increase circulation and improve the body's utilization of oxygen. Do them for at least 20 minutes a session, three to five times a week.