单选题

单选题The typical shoe of the Middle Ages was a soft, Uclinging/U moccasin that extended to the ankle.

单选题They have had a good harvest for three years in______.

单选题Of all the components of a good night's sleep, dreams seem to be least within our control. In dreams, a window opens into a world where logic is suspended and dead people speak. A century ago, Freud formulated this revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears; by the late 1970s, neurologists had switched to thinking of them as just "mental noise"—the random byproducts of the neural-repair work that goes on during sleep. Now researchers suspect that dreams are part of the mind's emotional thermostat, regulating moods while the brain is "off-line". And one leading authority says that these intensely powerful mental events can be not only harnessed but to help us sleep and feel better. "It's your dream, " says Rosalind Cartwright, chair of psychology at Chicago's Medical Center, "If you don't like it, change it. " Evidence from brain imaging supports this view. The brain is as active during REM(rapid eye movement)sleep—when most vivid dreams occur—as it is when fully awake, says Dr. Eric Nofzinger at the University of Pittsburgh. But not all parts of the brain are equally involved; the limbic system(the "emotional brain")is specially active, while the prefrontal cortex(the center of intellect and reasoning)is relatively quiet. "We wake up from dreams happy or depressed, and those feelings can stay with us all day," says Stanford sleep researcher Dr. William Dement. The link between dreams and emotions shows up among the patients in Cartwright's clinic. Most people seem to have more bad dreams early in the night, progressing toward happier ones before awakening, suggesting that they are working through negative feelings generated during the day. Because our conscious mind is occupied with daily life we don't always think about the emotional significance of the day's events—until, it appears, we begin to dream. And this process need not be left to the unconscious. Cartwright believes one can exercise conscious control over recurring bad dreams. As soon as you awaken, identify what is upsetting about the dream. Visualize how you would like it to end instead; the next time it occurs, try to wake up just enough to control its course. With much practice people can learn to, literally, do it in their sleep. At the end of the day, there's probably little reason to pay attention to our dreams at all unless they keep us from sleeping or "we wake up in panic, " Cartwright says. Terrorism, economic uncertainties and general feelings of insecurity have increased people's anxiety. Those suffering from persistent nightmares should seek help from a therapist. For the rest of us, the brain has its ways of working through bad feelings. Sleep — or rather dream—on it and you'll feel better in the morning.

单选题Auctions are public sales of goods, conducted by an officially approved auctioneer. He asks the crowd assembled in the auction-room to make offers, or "bids", for the various items on sale. He encourages buyers to bid higher figures and finally names the highest bidder as the buyer of the goods. This is called "knocking down" the goods, for the bidding ends when the auctioneer bangs a small hammer on a table at which he stands. This is often set on a raised platform called a rostrum. The ancient Romans probably invented sales by auction, and the English word comes from the Latin Autcio, meaning "increase". The Romans usually sold in this way the spoils taken in war; these sales were called sub hasta, meaning "under the spear", a spear being stuck in the ground as a signal for a crowd to gather. In England in the eighteenth and nineteenth centuries, goods were often sold "by the candle": a short candle was lit by the auctioneer, and bids could be made while it stayed alight. Practically all goods whose qualities vary are sold by auction. Among these are coffee, hides, skins, wool, tea, cocoa, furs, spices, fruit and vegetables and wines. Auction sales are also usual for land and property, antique furniture, pictures, rare books, old china and similar works of art. The auction-rooms as Christie's and Sotheby's in London and New York are world-famous. An auction is usually advertised beforehand with full particulars of the articles to be sold and where and when they can be viewed by prospective buyers. If the advertisement cannot give full details, catalogues are printed, and each group of goods to be sold together, called a "lot", is usually given a number. The auctioneer need not begin with Lot I and continue in numerical order; he may wait until he registers the fact that certain dealers are in the room and then produce the lots they are likely to be interested in. The auctioneer's services are paid for in the form of a percentage of the price the goods are sold for. The auctioneer therefore has a direct interest in pushing up the bidding as high as possible.

单选题He is confronted with the moral dilemma of whether to steal a drug he can't afford so that he can save his wife's life.

单选题In addition to being physically sick, my dad was in the midst of a nervous ______, though none of us knew to call it that at the time.

单选题To qualify for such a position, the native would first have to receive specialized training, and this is ______. A. refused B. discouraged C. denied D. forbidden

单选题Small boys are______questioners. They ask questions all the time.

单选题The washing machines sold in our shop will be ______ for one year.

单选题There is a large joint programme of development among leading US computer companies, and IBM, though it says nothing, may well have the biggest programme of all.

单选题His company Uempowered/U the young engineer to negotiate the contract to be signed with the American Microsoft.

单选题Free medical trealment in this country covers sickness of mind as well as______sicknesses.

单选题Nuclear power"s danger to health, safety, and even life itself can be summed up in one word: radiation. Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can"t be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can"t detect them, sense them without a radio receiver. Similarly, we can"t sense radio activity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being outright by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit. And if they are killed outright, your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated and feel fine, then die of cancer in five, ten, or twenty years later as a result. Or a child can be born weak or liable to serious illness as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth.

单选题He has been hoping for a raise for the last four months but his boss is_____to give him one.

单选题Mr. Abu, the laboratory attendant, came in from the adjoining store and briskly cleaned the blackboard. He was a retired African sergeant from the Army Medical Corps and was feared by the boys. If he caught any of them in any petty thieving, he offered them the choice of a hard smack on the bottom or of being reported to the science master. Most boys chose the former as they knew the matter would end there with no long interviews, moral arguments and an entry in the conduct book. The science master, a man called Vernier, stepped in and stood on his small platform. Vernier set the experiments for the day and demonstrated them, then retired behind the "Church Times" which he read seriously in between walking quickly along the rows of laboratory benches, advising boys. It was a simple heat experiment to show that a dark surface gave out more heat by radiation than a bright surface. During the class, Vernier was called away to the telephone and Abu as not about, having retired to the lavatory for a smoke. As soon as a posted guard announced that he was out of sight, minor pandemonium(混乱)broke out. Some of the boys raided the store. The wealthier ones took rubber tubing to make catapults and to repair bicycles, and helped themselves to chemicals for developing photographic films. The poorer boys, with a more determined aim, took only things of strict commercial interest which could be sold easily in the market. They emptied stuff into bottles in their pockets. Soda for making soap, magnesium sulphate for opening medicine, salt for cooking, liquid paraffin for women's hairdressing, and fine yellow iodoform powder much in demand for sprinkling on sores. Kojo objected mildly to all this. "Oh, shut up!" a few boys said. Sorie, a huge boy who always wore a fez indoors, commanded respect and some leadership in the class. He was gently drinking his favorite mixture of diluted alcohol and bicarbonate—which he called "gin and fizz" —from a beaker. "Look here, Kojo, you are getting out of hand. What do you think our parents pay taxes and school fees for? For us to enjoy—or to buy a new car every year for Simpson?" The other boys laughed. Simpson was the Europe-an headmaster, feared by the small boys, adored by the boys in the middle school, and liked, in a critical fashion, with reservations, by some of the senior boys and African masters. He had a passion for new motor-cars, buying one yearly. "Come to think of it," Sorie continued to Kojo, "you must take something yourself, then we'll know we are safe. " "Yes, you must," the other boys insisted. Kojo gave in and, unwillingly, took a little nitrate for some gunpowder experiments which he was carrying out at home. "Someone!" the look-out called. The boys ran back to their seats in a moment. Sorie washed-out his mouth, at the sink with some water. Mr. Abu, the laboratory attendant, entered and observed the innocent expression on the faces of the whole class. He looked round fiercely and suspiciously, and then sniffed the air. It was a physics experiment, but the place smelled chemical. However, Vernier came in then. After asking if anyone was in difficulties, and finding that no one could in a moment think up anything, he retired to his chair and settled down to an article on Christian reunion.

单选题______near-perfect English language skills, the students were keen to explore every aspect of Australian culture, from Aussie eating customs to family and student life, popular culture, the natural landscape and the ever-popular Australian native animals.

单选题With his donation, we can now ______the possibility that money won't arrive when planning the program.

单选题The passage suggests which of the following about the increased resistance to harmful root fungi that some Plants infected with mycorrhizal fungi seem to exhibit?