单选题Public _________ for the usually low-budget, high-quality films has enabled the independent film industry to grow and thrive.

单选题You should fill in the application form ______ before you send it back to the university.

单选题A problem that has plagued some fictional Utopias is ______.

单选题We should ______ with the doctor's request.

单选题What percentage of the population in a modern technological society are, like myself, in the fortunate position of being workers? At a guess I would say sixteen per cent, and I do not think that figure is likely to get bigger in the future. Technology and the division of labor have done two things: by eliminating in many fields the need for special strength or skill, they have made a very large number of paid occupations which formerly were enjoyable work into boring labor, and by increasing productivity they have reduced the number of necessary laboring hours. It is already possible to imagine a society in which the majority of the population, that is to say, its laborers, will have almost as much leisure as in earlier times was enjoyed by the aristocracy. When one recalls how aristocracies in the past actually behaved, the prospect is not cheerful. Indeed, the problem of dealing with boredom may be even more difficult for such a future mass society than it was for aristocracies. The latter, for example, ritualized their time; there was a season to shoot grouse, a season to spend in town, etc. The masses are more likely to replace an unchanging ritual by fashion which changes as often as possible in the economic interest of certain people. Again, the masses cannot go in for hunting, for very soon there would be no animals left to hunt. For other aristocratic amusements like gambling, dueling, and warfare, it may be only too easy to find equivalents in dangerous driving, drug-taking, and senseless acts of violence. Workers seldom commit acts of violence, because they can put their aggression into their work, be it physical like the work of a smith, or mental like the work of a scientist or an artist. The role of aggression in mental work is aptly expressed by the phrase "getting one's teeth into a problem".

单选题A few minutes ago, walking back from lunch, I started to cross the street when I heard the sound of a coin dropping. It wasn't much but, as I turned, my eyes caught the heads of several other people turning, too. A woman dropped what appeared to be a dime. The tinkling sound of a coin dropping on pavement is an attention-getter. It can be nothing more than a penny. Whatever the coin is, no one ignores the sound of it. It got me thinking about sounds again. We are besieged by so many sounds that attract the most attention. People in New York City seldom turn to look when a fire engine, a police car or an ambulance comes screaming along the street. When I'm in New York, I'm a New Yorker. I don't turn either. Like the natives, I hardly hear a siren there. At home in my little town in Connecticut, it's different. The distant ringing of a police car brings me to my feet if I'm in bed. It's the quietest sounds that have the most effect on us, not the loudest. In the middle of the night, I can hear a dripping tap a hundred yards away though three closed doors. I've been hearing little creaking noises and sounds which my imagination turns into footsteps in the middle of the night for twenty-five years in our house. How come I never hear the sounds in the daytime? I'm quite clear in my mind what the good sounds are and what the bad sounds are. I've turned against whistling, for instance. I used to think of it as the mark of a happy worker but lately I've been associating the whistler with a nervous person making compulsive noises. The tapping, tapping, tapping of my typewriter as the keys hit the paper is a lovely sound to me. I often like the sound of what I write better than the looks of it.

单选题The director of the research institute came in person to ______ that everything was all right. A. make out B. make sure C. make clear D. make up

单选题Please don"t say anything hurtful to her. She is a very ______ person.

单选题Allen placed too much ______ on sports and not enough on his studies.

单选题The main difference between deserved-punishment and corrective justice is ______.

单选题Yangtze River flows at a width of up to 2km and an average depth of between 6 and 15m through a large plain with many lakes. This area is______to severe flooding and accumulation of river sediment.

单选题In addition to restraining economic growth, the government was increasingly anxious to tackle its trade ______, which has been a mounting concern in the European Union and the US.

单选题Although any destruction of vitamins caused by food irradiation could be______ the use of diet supplements, there may be no protection from carcinogens that some fear might be introduced into foods by the process.

单选题At 9:00 in the evening on January 29, just as President George W. Bush was about to begin his first State of the Union address, I gathered with three anxious scientists in a small, windowless laboratory in Worcester, Massachusetts. We were at Advanced Cell Technology—a privately owned biotechnology company that briefly made international headlines last fall by publishing the first scientific account of cloned human embryos. The significance of the achievement was debatable: the company"s most successful embryo had reached only six cells before it stopped dividing (one other had reached four cells, another had reached two)—a fact that led to a widespread dismissal, in the media and the scientific community, of ACT"s "breakthrough". The work was largely judged to be preliminary, inconsequential, and certainly not worthy of headlines. Many people in political and religious circles, however, had a decidedly different view. They deemed ACT"s work an ethical transgression of the highest order and professed shock, indignation, and horror. Nonetheless, ACT was pressing ahead—which was why I had come to the company"s cloning lab that night in January. The door to the lab was locked; a surveillance camera mounted on the ceiling watched our every move; and the mood was at once urgent and tense. A human egg, retrieved just hours earlier from a young donor, was positioned under a microscope, its image glowing on a nearby video monitor. The egg"s chromosomes would shortly be removed, and the scientists in the room would attempt to fuse what remained of the egg with a human skin cell. If the procedure succeeded, the result would be a cloned human embryo. Skin cell to embryo—it"s one of the most remarkable quick-change scenarios modern biology has to offer. It"s also one of the most controversial. Since the announcement, in 1997, of the cloning of the sheep Dolly, attempts to use human cells for cloning have provoked heated debate in the United States, separating those who have faith in the promise of the new technology from those who envision its dark side and unintended consequences. Crucial to the debate is the fact that human cloning research falls into two distinct categories: reproductive cloning, a widely frowned-on effort that aims to produce a fully formed child; and therapeutic cloning, a scientifically reputable procedure that takes place entirely at the microscopic level and is designed to advance medical therapies and cure human ailments. The two start out the same way—with a new embryo in a Petri dish. But the scientists I was observing in the lab had no intention of creating a person. Instead they were embarking on an experiment that, if successful, would be a first step toward creating radical new cures for patients like the donor of the skin cell—Trevor Ross (not his real name), a two-year-old boy afflicted with a rare and devastating genetic disease. The mood in the lab was tense in part because of the uncertain outcome of the experiment. But it was also tense because of concern over what President Bush might say about cloning in his address to the nation. A radio in one corner of the room was tuned to the broadcast as the scientists began their work, and they were listening carefully: in perhaps no other fields of science are researchers as mindful of which way the political winds are blowing. The ACT scientists had good reason to be concerned—what they were doing that night might soon be made illegal.

单选题What can be learned about the on-line doctors' visits?

单选题Suppose you go into a fruiterer's shop, wanting an apple—you take up one, and on biting it you find it is sour；you look at it, and see that it is hard and green．You take up another one, and that, too, is hard, green, and sour．The shopman offers you a third；but, before biting it, you examine it, and find that it is hard and green, and you immediately say that you will not have it, as it must be sour,like those that you have already tried． Nothing can be more simple than that, you think；but if you will take the trouble to analyze and trace out into its logical elements what has been done by the mind, you will be greatly surprised．In the first place you have performed the operation of induction．You find that, in two experiences, hardness and greenness in apples went together with soumess．It was so in the first case, and it was confirmed by the second．True, it is a very small basis, but stillit is enough from which to make an induction；you generalize the facts, and you expect to find sourness in apples where you get hardness and greenness．You found upon that a general law,that all hard and green apples are sour；and that, so far as it goes, is a perfect induction．Well, having got your natural law in this way,when you are offered another apple which you find it hard and green, you say,"all hard and green apples are sour；this apple is hard and green；therefore, this apple is sour．"That train of reasoning is what logicians call a syllogism．and has all its various parts and terms—its major premises, its minor premises, and its conclusion．And by the help of further reasoning。which, if drawn out, would have to be exhibited in two or three other syllogisms, you arrive at your final determination, "I will not have that apple．"So that, you see, you have, in the first place． established a law by induction, and upon that you have founded a deduction, and reasoned out the special particular case． Well now,suppose, having got your conclusion of the law,that at some times afterwards．you are discussing the qualities of apple with a friend；you will say to him, "It is a very curious thing． but I find that all hard and green apples are sour!"Your friend says to you, "But how do you know that?"You at once reply,"Oh, because I have tried them over and over again, and haye always found them to be so．"Well．if we are talking science instead of common sense, we should call that an experimental verification．And, if still opposed, you go further,and say,"I have heard from people, in Somerset shire and Devon shire, where a large number of apples are grown, and in London, where many apples are sold and eaten, that they have observed the same thing．"It is also found to be the case in Normandy,and in North America．In short, I find it to be the universal experience of mankind wherever attention has been directed to the subject．Whereupon, your friend, unless he is a very unreasonable man, agrees with you, and is convinced that you are quite right in the conclusion you have drawn．He believes, although perhaps he does not know he believes it, that the more extensive verifications have been made．and results of the same kind arrived at—that the more varied the conditions under which the same results are attained, the more certain is the ultimate conclusion, and he disputes the question no further．He sees that the experiment has been tried under all sorts of conditions, as to time, place, and people, with the same result；and he says with you, therefore, that the law you have laid down must be a good one, and he must believe it．

单选题 The range in frequencies of musical sounds is approximately 20-20,000 cycles per second (cy/sec). Some people can hear higher frequencies khan others. Longitudinal waves whose frequencies are higher than those within the audible range are called ultrasonic frequencies. Ultrasonic frequencies are used in sonar for such purposes as submarine detection and depth finding. Ultrasonic frequencies are also being tried for sterilizing food since these frequencies kill some bacteria. Sound waves of all frequencies in the audible range travel at the same speed in the same medium. In the audible range, the higher the frequency of the sound the higher is the pitch. The term supersonic refers to speed greater than sound. An airplane traveling at supersonic speed is moving at a speed greater than the speed of sound in air at that temperature. Mach 1 means a speed equal to that of sound. Mach 2 means a speed equal to twice that of sound, etc. Musical sounds have three basic characteristics: pitch, loudness, and quality or timbre. As was indicated above, pitch is determined largely by the frequency of the wave reaching the ear. The higher the frequency the higher is the pitch. Loudness depends on the amplitude of the wave reaching the ear. For a given frequency, the greater the amplitude of the wave the louder the sound. To discuss quality of sound we need to clarify the concept of overtones. Sounds are produced by vibrating objects. If these objects are given a gentle push, they usually vibrate at one definite frequency producing a pure tone. This is the way a tuning fork is usually used. When objects vibrate freely after a force is momentarily applied, they are said to produce their natural frequency. Some objects, like strings and air columns, can vibrate naturally at more than one frequency at a time. The lowest frequency which an object can produce when vibrating freely is known as the object's fundamental frequency. Other frequencies that the object can produce are known as its overtones. The quality of a sound depends on the number and relative amplitude of the overtones present in the wave reaching the ear.

单选题These goods are sold at reduced prices, ______.