单选题Bill Gates: Unleashing Your Creativity I"ve always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place. For as long as I can remember, I"ve loved learning new things and solving problems. So when I sat down at a computer for the first time in seventh grade, I was hooked. It was a clunky old teletype machine and it could barely do anything compared to the computers we have today. But it changed my life. When my friend Paul Alien and I started Microsoft 30 years ago, we bad a vision of "a computer on every desk and in every home," which probably sounded a little too optimistic at a time when most computers were the size of refrigerators. But we believed that personal computers would change the world. And they have. And after 30 years, I"m still as inspired by computers as I was back in seventh grade. I believe that computers are the most incredible tool we can use to feed our curiosity and inventiveness to help us solve problems that even the smartest people couldn"t solve on their own. Computers have transformed how we learn, giving kids everywhere a window into all of the world"s knowledge. They"re helping us build communities around the things we care about and to stay close to the people who are important to us, no matter where they are. Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it "tap-dancing to work". My job at Microsoft is as challenging as ever, but what makes me "tap-dance to work" is when we show people something new, like a computer that can recognize your handwriting or your speech, or one that can store a lifetime"s worth of photos, and they say, "I didn"t know you could do that with a PC!" But for all the cool things that a person can do with a PC, there are lots of other ways we can put our creativity and intelligence to work to improve our world. There are still far too many people in the world whose most basic needs go unmet. Every year, for example, millions of people die from diseases that are easy to prevent or treat in the developed world. I believe that my own good fortune brings with it a responsibility to give back to the world. My wife, Melinda, and I have committed to improving health and education in a way that can help as many people as possible. As a father, I believe that the death of a child in Africa is no less poignant or tragic than the death of a child anywhere else, and that it doesn"t take much to make an immense difference in these children"s lives. I"m still very much an optimist, and I believe that progress on even the world"s toughest problems is possible—and it"s happening every day. We"re seeing new drugs for deadly diseases, new diagnostic tools, and new attention paid to the health problems in the developing world. I"m excited by the possibilities I see for medicine, for education and, of course, for technology. And I believe that through our natural inventiveness, creativity and willingness to solve tough problems, we"re going to make some amazing achievements in all these areas in my lifetime.

单选题The architecture is harmonious and no building is over six-storey high.______

单选题A New Cause of Suffering A conference on obesity (肥胖症) was recently held in Vienna. Two thousand experts from more than fifty countries attended the conference. According to statistics, 1.2 billion people worldwide are overweight, and 250 million are too fat. Obesity is rapidly becoming a new cause of suffering. Professor Friedrich Hopichler of Salzberg said: "We are living in the new age but with the metabolism (新陈代谢) of a stone-age man. I have just been to the United States. It is really terrible. A pizza (比萨饼) shop is appearing on every comer. We have been occupied by fast food and Coca-Cola-ization." Many of the experts stressed that obesity was a potential killer. Hopichler said: "Eighty percent of all diabetics (糖尿病人) are too fat, also fifty percent of all patients with high blood pressure and fifty percent with fatty tissue complaints. Ten percent more weight means thirteen percent more risk of heart disease. Reducing one"s weight by ten percent leads to thirteen percent lower blood pressure." Another expert Hermann Toplak said that the state health services should improve their financing of preventive programs. "The health insurance pays for surgery (such as reducing the size of the stomach) when the body-mass index (身体质量指数) is more than 40. That is equivalent to a weight of 116 kilograms for a height of 1.60 meters. One should start earlier. " Toplak said that prevention should begin in school. "Child obesity has a close relation with the time which children spend in front of TV sets. "

单选题Their parents once lived under very severe conditions.

单选题Sleep Deficit Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic(流行病) of sleepiness in the nation. "I can"t think of a single study that hasn"t found Americans getting less sleep than they ought to," says Dr. David. Even people who think they are sleeping enough would probably be better off with more rest. The beginning of our sleep-deficit(睡眠不足) crisis can be traced to the invention of the light bulb a century ago. From diary entries and other personal accounts from the 18th and 19th centuries, sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us, when we had nothing to do in the evening down on the farm, and it was dark." By the 1950s and 1960s, that sleep schedule had been reduced dramatically, to between 7.5 and 8 hours, and most people had to wake up to an alarm clock. "People cheat on their sleep, and they don"t even realize they"re doing it," says Dr. David. "They think they"re okay because they can get by on 6.5 hours, when they really need 7.5, 8 or even more to feel ideally vigorous." Perhaps the most merciless robber of sleep, researchers say, is the complexity of the day. Whenever pressures from work, family, friends and community mount, many people consider sleep the least expensive item on his programme. In our society, you"re considered dynamic if you say you only need 5.5 hours" sleep. If you"ve got to get 8.5 hours, people think you lack drive and ambition. To determine the consequences of sleep deficit, researchers have put subjects through a set of psychological and performance tests requiring them, for instance, to add columns of numbers or recall a passage read to them only minutes earlier. "We"ve found that if you"re in sleep deficit, performance suffers," says Dr. David. "Short-term memory is weakened, as are abilities to make decisions and to concentrate."

单选题Eventually , she got a job and moved to London.

单选题The Klondike was the scene of one of the biggest gold rashes the world has ever known. A. location B. view C. event D. landscape

单选题Poisonous {{U}}vapors{{/U}} burst out of the factory during the accident, causing several hundred deaths. A. gases B. threat C. fuels D. bubbles

单选题The dentist has decided to take out the girl"s bad tooth.

单选题Late-Night Drinking Coffee lovers beware. Having a quick "pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 a.m. and 4 a.m., before falling again. "It"s the neurohormone that controls our sleep and tells our body when to sleep and when to wake," says Manrice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body"s levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decaf. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decal. They also took half an hour to drop off—twice as long as usual—and jigged around in twice as much. In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production. Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.

单选题Red flag was placed there as a token of danger.

单选题lacking a care for AIDS, society must offer education, not only by public pronouncement but in classrooms. Those with AIDS or those at high risk of AIDS suffer prejudice, they are feared by some people who find living itself unsafe, while others conduct themselves with a "bravado(冒险心理)"that could be fatal. AIDS has afflicted a society already short on humbanism, open--handedness and optimism. Attempts to strike it out with the offending microbe are not abetted(教唆)by pre--existing social ills. Such concerns impelled me to offer the first university--level undergraduate AIDS course, with its two important aims: To address the fact that AIDS is caused by a virus, not by moral failure or social collapse. The proper response to AIDS is compassion coupled with an understanding of the disease itself. We wanted to foster(help the growth of) the idea of a humane society. To describe how AIDS tests the institutions upon which our society rests. The economy, the political system, science, the legal Establishment, the media and our moral ethical--philosophical attitudes must respond to the disease. Those responses, whispered, or shrieked, easily accepted or highly controversial, must be put in order if the nation is to manage AIDS. Scholars have suggested that how a society deals with the threat of AIDS describes the extent to which that society has the right to call itself civilized. AIDS, then, is woven into the tapestry(挂毯)of modern society; in the course of explaining that tapestry, a teacher realizes that AIDS may bring about changes of historic proportions. Democracy obliges its educational system to prepare students to become informed citizens, to join their voices to the public debate in spried by AIDS. Who shall direct just what resources of manpower and money to the problem of AIDS? Even more basic, who shall formulate a national policy on AIDS? The educational challenge, then, is to enlighten(启发)the individual and the social, or public , responses to AIDS.

单选题The conference explored the possibility of closer trade links.

单选题The need for more teachers of science and mathematics shows no sign of Udecreasing/U in the near future.

单选题Her shoes go with her gloves; they look very well together.A. suitB. matchC. fitD. compete

单选题The old concerns lose importance and some of them vanish altogether.A. developB. disappearC. lingerD. renew

单选题It seems that there is a fall in the crime rate.A. dropB. riseC. abilityD. increase

单选题Effects of Exercise on Elderly Diabetics (糖尿病人) Most older people with so-called type 2 diabetes (糖尿病) could stop taking insulin (胰岛素) if they would do brisk (轻快的) exercise for 30 minutes just three times a week, according to new medical research results reported in a Copenhagen newspaper. Results from tests conducted on diabetics at the Copenhagen central hospital Rigshospitalet's Center for Muscle Research showed that physical exercise can boost the body's ability to make use of insulin by 30 per cent. This is equal to the effect most elderly diabetics get from their insulin medication (药物治疗) today. Researchers had a group of non-diabetic men and a group of men with type 2 diabetes, all more than 60 years of age, exercise on bicycles six times a week for three months. After the three months the doctors measured how much sugar the test subjects' muscles could make use of as a measure for how well their insulin worked. Associate Professor Dr Flemming Dela of the Muscle Research Center said the tests demonstrated that the exercising diabetics had made as good use of insulin as the healthy non-diabetic persons. “This means that the insulin works just as well for both groups. Physical exercise cannot cure people of diabetes, but it can eliminate almost all their symptoms. At the same time, it can put off the point at which they have to begin taking insulin," Dela said. Insulin is a hormone produced by the pancreas (胰腺), controlling sugar in the body and is used against diabetes. Dela said that to achieve the desired effect diabetics need only exercise to the point where they begin to sweat, but that the activity has to be maintained since it wears off after five days without sufficient exercise. Most diabetics realize that they have to watch their diet while remaining unaware of the importance of exercise, Dela added.

单选题Her income is not sufficient to support her family.

单选题{{U}}Beware{{/U}} of pickpockets in public places.