单选题The little girl is just learning to walk and she's always ______ over.

单选题Richard Satava, program manager for advanced medical technologies, has been a driving force bringing virtual reality to medicine, where computers create a "virtual" or simulated environment for surgeons and others medical practitioners (从业者). "With virtual reality we'll be able to put a surgeon in every trench," said Satava. He envisaged a time when soldiers who are wounded fighting overseas are put in mobile surgical units equipped with computers. The computers would transmit images of the soldiers to surgeons back in the U. S. The surgeons would look at the soldier through virtual reality helmets (头盔) that contain a small screen displaying the image of the wound. The doctors would guide robotic instruments in the battlefield mobile surgical unit that operate on the soldier. Although Satava's vision may be years away from standard operating procedure, scientists are progressing toward virtual reality surgery. Engineers at an international organization in California are developing a tele-operating device. As surgeons watch a three-dimensional image of the surgery, they move instruments that are connected to a computer, which passes their movements to robotic instruments that perform the surgery. The computer provides feedback to the surgeon on force, textures, and sound. These technological wonders may not yet be part of the community hospital setting but increasingly some of the machinery is finding its way into civilian medicine. At Wayne State University Medical School, surgeon Lucia Zamorano takes images of the brain from computerized scans and uses a computer program to produce a 3-D image. She can then maneuver the 3-D image on the computer screen to map the shortest, least invasive surgical path to the tumor (肿瘤). Zamorano is also using technology that attaches a probe to surgical instruments so that she can track their positions. While cutting away a tumor deep in the brain, she watches the movement of her surgical tools in a computer graphics image of the patient's brain taken before surgery. During these procedures--operations that are done through small cuts in the body in which a miniature camera and surgical tools are maneuvered--surgeons are wearing 3-D glasses for a better view. And they are commanding robot surgeons to cut away tissue more accurately than human surgeons can. Satava says, "We are in the midst of a fundamental change in the field of medicine. /

单选题The abacus is the counting frame that was the most widely used device for doing arithmetic in ancient times and whose use______into modern times in the Orient.

单选题I am running down an alley with a stolen avocado, having climbed over a white brick fence and into the forbidden backyard of a carefully manicured estate at the corner of E1 Dorado and Crescent Drive in Beverly Hills, California. I have snatched a rock-hard Fuerte avocado from one of the three avocado trees near the fence, I have been told that many ferocious dogs patrol the grounds; they are killers, these dogs. I am defying them. They are nowhere to be found, except in my mind, and I'm out and gone and in the alley with their growls directing my imagination. I am running with fear and exhilaration, beginning a period of summer. Emerging from the shield of the alley I cut out into the open. Summer is about running, and I am running, protected by distance from the dogs. At the corner of Crescent Drive and Lomitas, I spot Bobby Tornitzer on a bike. I shout "Tornitzer!" He turns his head. His bike wobbles. An automobile moving rapidly catches Tornitzer's back wheel. Tornitzer is thrown high into the air and onto the concrete sidewalk of Crescent Drive. The driver, a woman with gray hair, swirls from the car hysterically and hovers noisily over Tornitzer, who will not survive the accident. I hold the avocado to my chest and stand, frozen, across the street. I am shivering in the heat, and sink to my knees. It is approximately 3:30 in the afternoon, it is June 21, 1946. In seven days, I will be 8 years old.

单选题You had better______ your seat today if you want to go to the game.

单选题One point Margherita makes about her job is that ______.

单选题If the cheek does not cover the full amount of your medical expense, mail the Medicare Explanation of Benefits (MEOB) to your carrier in order to receive ______ for the balance of your expense.

单选题There were many people present and he appeared only for a few seconds, so I only caught a______of him.

单选题The passage provides information for answering all of the following questions except ______.

单选题{{B}}Text 1{{/B}} As Eleanor Roosevelt once said, "Universal human rights begin in small places, close to home." Tolerance org, a web site from the Southern Poverty Law Center, is helping parents across the country create homes in which tolerance and understanding are guiding themes. "Tile goal of nurturing open-minded, empathetic children is a challenging one," says Jennifer Holladay, director of Tolerance. org. "To cultivate tolerance, parents have to instill in children a sense of empathy, respect and responsibility—to oneself and to others—as well as the recognition that every person on earth is a treasure." Holladay offers several ways parents can promote tolerance: Talk about tolerance. Tolerance education is an ongoing process; it cannot be captured in a single moment. Establish a high comfort level for open dialogue about social issues. Let children know that no subject is taboo. Identify intolerance when children are exposed to it. Point out stereotypes and cultural misinformation depicted in movies, TV shows, computer games and other media. Challenge bias when it comes from friends and family members. Do not let the moment pass. Begin with a qualified statement: "Andrew just called people of XYZ faith 'lunatics.' What do you think about that, Zee?" Let children do most of the talking. Challenge intolerance when it comes from your children. When a child says or does something that reflects biases or embraces stereotypes, confront the child: "What makes that joke funny, Jerome?" Guide the conversation toward internalization of empathy and respect—"Mimi uses a walker. honey. How do you think she would feel about that joke?" or "How did you feel when Robbie made fun of your glasses last week?" Support your children when they are the victims of intolerance. Respect children's troubles by acknowledging when they become targets of bias. Don't minimize the experience. Provide emotional support and thee brainstorm constructive responses. For example, develop a set of comebacks m use when children are the victims of name-calling. Create opportunities for children to interact with people who are different from them. Look critically a] how a child defines "normal". Expand the definition. Visit playgrounds where a variety of children are present—people of different races, socioeconomic backgrounds, family structures, etc. Encourage a child to spend time with elders—grandparents, for example. Encourage children to call upon community resources. A child who is concerned about world hunger can volunteer at a local soup kitchen or homeless shelter. The earlier children internet with the community, the better. This will help convey the lesson that we are not islands unto ourselves. Model the behavior you would like to see. As a parent and as your child's primary role model, be consistent in how you treat others. Remember, you may say, "Do as I say, not as I do." but actions really do speak louder than words.

单选题How to evaluate the performance of students is still a problem that troubles many professors. A. examine and judge B. assist in C. enhance D. account for

单选题Steve Courtney wrote historical novels. Not, he was quick to explain, over colourful love stories of the kind that made so much money for so many women writers, but novels set and correctly set, in historical periods. Whatever difference he saw in his own books, his readers did not seem to notice it, and his readers were nearly all women. He had studied at university, but he had not been a particularly good student, and he had never afterwards let any academic knowledge he had gained interfere with his writing. Helen, his wife, who did not have a very high opinion of her husband's ability as a novelist, had been careful to say when she married him that she was not historically minded. Above all, Helen was doubtful whether her relationship with Steve would work at all in the village of Stretton, to which they had just moved. It was Steve who had wanted to move to the country, and she had been glad of the change, in principle, whatever doubts she was now having about Stretton as a choice. But she wondered whether Steve would not, before very long, want to live in London again, and what she would do if he did. The Stretton house was not a weekend cottage. They had moved into it and given up the London flat altogether, partly at least, she suspected, because that was Steve's idea of what a successful author ought to do. However, she thought he was not going to feel like a successful author half as much in Stretton as he had in London. On the other hand, she supposed he might just start dashing up to London for the day to see his agent or have lunch with his publisher, leaving her behind in Stretton, and she thought on the whole she would like that.

单选题Which of the following is not mentioned in the passage as a factor that has contributed to creating an environment tolerant of or even favorable to drug abuse?

单选题Which of the following is true about Olson?

单选题A new catastrophe faces Afghanistan. The American bombing campaign is conspiring with years of civil conflict and drought to create an environmental crisis. Humanitarian and political concerns are dominating the headlines. But they are also masking the disappearance of the country's once rich habitat and wildlife, which are quietly being crashed by war. The UN is dispatching a team of investigators to the region next month to evaluate the damage. "A healthy environment is a prerequisite for rehabitation," says Klaus Topfer, head of the UN Environment Programme. Much of south-east Afghanistan was once lush forest watered by monsoon rains. Forests now cover less than two per cent of the country. "The worst deforestation occurred during Taliban role, when its timber mafia denuded forests to sell to Pakistani markets," says Usman Qazi, an environmental consultant based in Quetta, Pakistan. And the intense bombing intended to flush out the last of the Taliban troops is destroying or burning much of what remains. The refugee crisis is also wrecking the environment, and much damage may be irreversible. Forests and vegetation are being cleared for much-needed fanning, but the gains are likely to be only short-term. "Eventually the land will be unfit for even the most basic form of agriculture," warns Hammad Naqi of the World Wide Fund for Nature in Pakistan. Refugees—around 4 million as the last count—are also cutting into forests for firewood. The hail of bombs falling on Afghanistan is making life particularly hard for the country's wildlife. Birds such as the pelican and endangered Siberian crone cross eastern Afghanistan as they follow one of the world's great migratory thoroughfares from Siberia to Pakistan and India. But the number of the birds flying across the region has dropped by a staggering 85 per cent. "Cranes are very sensitive and they do not use the route if they see any danger," says Ashiq Ahgmad, an environmental scientist for the WWF in Peshawar, Pakistan, who has tracked the collapse of the birds, migration this winter. The rugged mountains also usually provide a safe haven for mountain leopards, gazelles, bears and Marco Polo sheep—the world's largest species. "The same terrain that allows fighters to strike and disappear back into the hills has also historically enabled wildlife to survive," says Peter Zahler of the Wildlife Conservation society, based in New York. But he warns they are now under intense pressure from the bombing and invasions of refugees and fighters. For instance, some refugees are hunting rare snow leopards to buy a safe passage across the border. A single fur can fetch $2, 000 on the black market, says Zahlen Only 5,000 or so snow leopards are thought to survive in central Asia, and less than 100 in Afghanistan, their numbers already decimated by extensive hunting and smuggling into Pakistan before the conflict. Timber, falcons and medicinal plants are also being smuggled across the border. The Taliban once controlled much of this trade, but the recent power vacuum could exacerbate the problem. Bombing will also leave its mark beyond the obvious craters. Defence analysts says that while depleted uranium has been used less in Afghanistan that in the Kosovo conflict, conventional explosives will litter the country with pollutants. They contain toxic compounds such as cyclonite, a carcinogen, and rocket propellants contain perchlorates, which damage thyroid glands.

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单选题The biographer has to dance between two shaky positions with respect to the subject. Too close a relation, and the writer may lose objectivity. Not close enough, and the writer may lack the sympathy necessary to any effort to portray a mind, a soul — the quality of life. Who should write the biography of a family, for example? Because of their closeness to the subject, family members may have special information, but by the same token, they may not have the distance that would allow them to be fair. Similarly, a king's servant might not be the best one to write a biography of that king. But a foreigner might not have the knowledge and sympathy necessary to write the king's biography — not for a readership from within the kingdom, at any rate. There is no ideal position for such a task. The biographer has to work with the position he or she in the world, adjusting that position as necessary to deal with the subject. Every position has strengths and weakness to thrive, a writer must try to become aware of these, evaluate them in terms of the subject, and select a position accordingly. When their subjects are heroes or famous figures, biographies often reveal a democratic motive: they attempt to show that their subjects are only human, no better than anyone else. Other biographies are meant to change us, to invite us to become better than we are. The biographies of Jesus found in the Bible are in this class. Biographers may claim that their account is the "authentic" one. In advancing this claim, they are helped if the biography is "authorized" by the subject; this presumably allows the biographer special access to private information. "Unauthorized" biographies also have their appeal, however, since they can suggest an independence of mind in the biographer. In book promotions, the "unauthorized" characterization usually suggests the prospect of juicy gossip that the subject had hoped to suppress. A subject might have several biographies, even several "authentic" ones. We sense intuitively that no one is in a position to tell "the story of life, perhaps not even the subject", and this has been proved by the history of biography.

单选题What he has done is not in ______ with your instructions.