单选题The graceful wooden windmills—a national symbol like wooden shoes and tulips—that have broken up the flat Dutch landscape for centuries yielded long ago to ungainly metal-pole turbines. Now, windmills are breaking into a new frontier. Though still in its teething stages, the "urban turbine" is a high-tech windmill designed to generate energy from the rooftops of busy cities. Lighter, quieter, and often more efficient than rural counterparts, they take advantage of the extreme turbulence and rapid shills in direction that characterize urban wind patterns. Prototypes have been successfully tested in several Dutch cities, and the city government in the Hague has recently agreed to begin a large-scale deployment in 2003. Current models cost US$8, 000 to US$12, 000 and can generate between 3,000 and 7,000 kilowatt hours of electricity per year. A typical Dutch household uses 3,500 kilowatt hours per year, while in the United States, this figure jumps to around 10, 000 kilowatt hours. But so far, they are being designed more for public or commercial buildings than for private homes. The smallest of the current models weighs roughly 200 kilograms and can be installed on a roof in a few hours without using a crane. Germany, Finland and Denmark have also been experimenting with the technology, but the ever-practical Dutch are natural pioneers in urban wind power mainly because of the lack of space. The Netherlands, with 16 million people crowded into a country twice the size of Slovenia, is the most densely populated in Europe. Problems remain, however, such as public safety concerns, and so strict standards should be applied to any potential manufacturers. Vibrations are the main problem in skyscraper-high turbines. People don't know what it would be like to work there, in an office next to one of the big turbines. It might be too hectic. Meanwhile, projects are under way to use minimills to generate power for lifeboats, streetlights, and portable generators. "I think the thing about wind power is that you can use it in a whole range of situations," said Corin Millais, of the European Wind Energy Association. "It's a very local technology, and you can use it right in your backyard. I don't think anybody wants a nuclear power plant in their backyard./

单选题Motorways are, no doubt the safest roads in Britain. Mile (41) mile, vehicle for vehicle, you axe much (42) likely to be killed or seriously injured than on an ordinary road. On (43) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (44) than in a comparable accident (45) on the roads. Motorways have no (46) bends, no roundabouts or traffic lights and (47) speeds are much greater than on other roads. Though the 70 mph limit is (48) in force, it is often treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (49) ten meters between each vehicle. The resulting horrific pile-ups (50) one vehicle stops for some reason—mechanical failure, driver error and so on—have become all (51) familiar through pictures in newspapers or on television. How (52) of these drivers realize that it takes a car about one hundred meters to brake to a stop (53) 70 mph? Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (54) wet the road, whatever the visibility in mist or fog, they (55) at ridiculous speeds oblivious of police warnings or speed restrictions (56) their journey comes to a conclusion. Perhaps one remedy (57) this motorway madness would be better driver education. At present, learner drivers are barred (58) motorways and are thus as far as this kind of driving is (59) , thrown in at the deep end. However, much more efficient policing is required, (60) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.

单选题By the last sentence of the passage the author means that

单选题Some industrial workers were trying, quietly and peacefully, to create a network of free trade unions, modeled presumably on Poland's famous Solidarity, which was an anathema to the regime.

单选题They continued to______ about and enjoy themselves until they became tired. (2005年中国科学院考博试题)

单选题The swimming pool is the children's favorite ______ in the summer. A. cradle B. haunt C. heading D. hedge

单选题After thirty years of television, people have become "speed watchers". Consequently, if the camera lingers, the interest of the audience ______.

单选题Concerned people want to ______ the risk of developing cancer. A. take B. decrease C. minimize D. claimed

单选题Which of the following is TRUE of the first stage of the evolution of mind?

单选题The two witnesses who saw the shootings were able to______who had fired first.

单选题Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from headaches and watering eyes, and even snowblindness, when exposed to several hours of "snow light". The United States Army has now determined that the glare from snow does not cause snow-blindness in troops in a snow-covered country. Rather, a man's eyes frequently find nothing to focus on in a broad expanse of a snow-covered area So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snowblindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white area is overcome.

单选题At first, movies were little more than amusing ______ pictures that appeared to move.

单选题If (allowed to) turn yellow, while still on the plant, bananas lose their (characteristically) good flavor, the skin (break open), insects (enter the inside), and the fruit rots.

单选题When a decision has finally been made, we obtain a ______ and do a full search of the place, taking away my material that might be required as evidence.

单选题After the concert, the clean-up crew found the ground ______ with papers. bottles and cans.(2009年北京航空航天大学考博试题)

单选题If you can't give up smoking completely, at least try to ______. A. take down B. turn down C. cut down D. set down

单选题It is all very well to blame traffic jams, the cost of petrol and the quick pace of modem life, but manners on the roads are becoming horrible. You might tolerate the rude and inconsiderate driver, but nowadays the well-mannered motorist is the exception to the rule. Perhaps the situation calls for a "Be Kind to Other Drivers" campaign, otherwise, it may get completely out of hand. Road politeness is not only good manners, but good sense too. It takes the most cool-headed and good-tempered of drivers to resist the temptation to revenge when subjected to uncivilized behaviors. on the other hand, a little politeness goes a long way towards relieving the tensions of motoring. A friendly nod or a wave of acknowledgement in response to an act of politeness helps to create an atmosphere of goodwill and tolerance so necessary in modem traffic conditions. But such acknowledgements of politeness are all too rare today. Many drivers nowadays don"t even seem able to recognize politeness when they see it. However, improper politeness can also be dangerous. A typical example is the driver who waves a child across a crossing into the path of oncoming vehicles that may be unable to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they care to. A veteran driver, whose manners are faultless, told me it would help if motorists learn to filter correctly into traffic streams one at a time without causing the total blockages (堵塞) that give rise to bad temper. Unfortunately, modem motorists can"t even learn to drive, let alone be well-mannered on the road. Years ago the experts warned us that the car-ownership explosion would demand a lot more give-and-take from all road users. It is high time for all of us to take this message to heart.

单选题She did not go out because of the ______cold.

单选题Which of the following is not true of those young computer hackers?