单选题Since she was alone, she opened the door ______, leaving the chain lock fastened. A.warily B.consciously C.audaciously D.recklessly

单选题Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more recently, rubber and plastic. And that was where we stuck, in surgical instrument terms, for many years. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also, in time, to revolutionize the art and science of surgery. The tool is the laser and it is being used by more and more surgeons all over the world, for a very large number of different complaints. The word laser means: Light Amplification by Stimulated Emission of Light. As we all know, light is hot; any source of light ——from the sun itself down to a humble match burning ——will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam. Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of the human eye without harming the front of the eye, simply by passing a laser beam right through the eyeball. No knives, no stitches (刀口缝合), no unwanted damage ——a true surgical wonder. Operations which once left patients exhausted and in need of long periods of recovery time now leave them feeling relaxed and comfortable. So much more difficult operations can now be tried. The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but more effective. Altogether, tomorrow may see more and more information coming to light on the diseases which can be treated medically.

单选题Chemistry did not emerge as: science until after the scientific revolution in 17th century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being almost entirely concerned with the practical arts of living. Cooking is essentially a chemical process; so is the melting of metals and the administration of drugs and potions. This basic chemical knowledge, which was applied in most cases as a rule of thumb, was nevertheless dependent on previous experiment. It also served to stimulate a fundamental curiosity about the processes themselves. New information was always being gained as artisans improved techniques to gain better results. The development of a scientific approach to chemistry was, however, hampered by several factors. The most serious problem was the vast range of material available and the consequent difficulty of organizing it into some system. In addition, there were social and intellectual difficulties. Chemistry is nothing if not practical: those who practice it must use their hands, they must have a certain practical aptitude. Yet in many ancient civilizations, practical tasks were primarily the province of a slave population. The thinker or philosopher stood apart from this mundane world, where the practical arts appeared to lack any intellectual content or interest. The final problem for early chemical science was the element of secrecy. Experts in specific trades had developed their own techniques and guarded their knowledge to prevent others from stealing their livelihood. Another factor that contributed to secrecy was the esoteric nature of the knowledge of alchemists, who were trying to transform base metals into gold or were concerned with the hunt for the elixir (炼金药). That would bestow the blessing of eternal life. In one sense, the second of these was the more serious impediment because the records of the chemical processes that early alchemists had discovered were often written down in symbolic language intelligible to very few or in symbols that were purposely obscure.

单选题The number of stay-at-home fathers reached a record high last year, new figures show, as families saw a______ in female breadwinners. (2013年北京大学考博试题)

单选题The little boy couldn't resist the ______to take the money on the table.

单选题In 1844, Charles Sturt, a British soldier and colonial administrator, made an expedition ______ a supposed inland sea; his party penetrated more than 1000 miles northward, almost to the center of Australia. A. in quest of B. with regard to C. in favor of D. by way of

单选题The continuous rain set______the harvesting of wheat by two weeks.

单选题Very few scientists ______ completely new answers to the world's problems. A. come up with B. come out C. come round D. come up to

单选题Men commit______motoring offences as women, according to the Home Office figures. A. nine times of B. as nine times C. nine times that of D. nine time as many

单选题American fans have selected Yao in a vote for the All-Star game ______ the legendary O'Neal, who ______ the "Great Wall" at the weekend as the Rockets beat the Los Angeles Lakers.

单选题This watch is ______ to all the other watches on the market

单选题{{B}}Passage 2{{/B}} Analysts have had their go at humor, and I have read sortie of this interpretative literature, but without being greatly instructed. Humor can be dissected, as a frog can, but the thing dies in the process and the innards (内在部分) are discouraging to any but the pure scientific mind. In a newsreel theatre the other day I saw a picture of a man who had developed the soap bubble to a higher point than it had ever before reached. He had become the ace soap bubble blower of America, had perfected the business of blowing bubbles, refined it, doubled it, squared it, and had even worked himself up into a convenient lather. The effect was not pretty. Some of the bubbles were too big to be beautiful, and the blower was always jumping into them or out of them, or playing some sort of unattractive trick with them. It was, if anything, a rather repulsive sight. Humor is a little like that: it won't stand much blowing up, and it won't stand much poking. It has a certain fragility, an evasiveness, which one had best respect. Essentially, it is a complete mystery. A human frame convulsed with laughter, and the laughter becoming mysterious and uncontrollable, is as far out of balance as one shaken with the hiccoughs or in the throes of a sneezing fit. One of the things commonly said about humorists is that they are really very sad people—clowns with a breaking heart. There is some truth in it, but it is badly stated. It would be more accurate, I think, to say that there is a deep vein of melancholy running through everyone's life and that the humorist, perhaps more sensible of it than some others, compensates for it actively and positively. Humorists fatten on trouble. They have always made trouble pay. They struggle along with a good will and endure pain cheerfully, knowing how well it will serve them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing boards and swollen drainpipes, suffering the terrible discomfort of tight boot (or as Josh Billings wittily called them, "tire boots"). They pour out their sorrows profitably, in a form that is not quite a fiction not quite a fact either. Beneath the sparking surface of these dilemmas flows the strong tide of human woe. Practically everyone is a manic depressive of sorts, with his up moments and his down moments, and you certainly don't have to be a humorist to taste the sadness of situation and mood. But there is often a rather fine line between laughing and crying, and if a humorous piece of writing brings a person to the point where his emotional responses are untrustworthy and seem likely to break over into the opposite realm, it is because humor, like poetry, has an extra content. It plays close to the big hot fire, which is Truth, and sometimes the reader feels the heat.

单选题One of the wrong notions about science is that many scientific discoveries have come about ______. A. accordingly B. accidentally C. artificially D. additionally

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.