单选题The findings of the experiment show that______.

单选题Listen to that laughter! They ______themselves. A. must enjoy B. must be enjoying C. may be enjoying D. can be enjoying

单选题A little girl was given so many picture books on her seventh birthday that her father thought his daughter should give one or two of her new books to a little neighbor boy named Robert. Now, taking books, or anything else, from a little girl is like taking candy from a baby, but the father of the little girl had his way and Robert got two of her books. "After all, that leaves you with nine," said the father, who thought he was a philosopher and a child psychologist (心理学家), and couldn"t shut his big stupid mouth on the subject. A few weeks later, the father went to his library to look up "father" in the Oxford English Dictionary, to feast his eyes on (饱眼福) the praise of fatherhood through the centuries, but he couldn"t find volume F-G and then he discovered that three others were missing, too—A-B, L-M, V-Z. He began to search his household, and learned what had happened to the four missing volumes. "A man came to the door this morning," said his little daughter, "and he didn"t know how to get from here to Torrington, or from Torrington to Winsted, and he was a nice man, much nicer than Robert, and so I gave him four of your books. After all, there are thirteen volumes in the Oxford English Dictionary, and that leaves you with nine. "

单选题Husband: Maybe we should talk with the landlady about it. Wife: ______ A. Never mind. B. Good idea. C. We must. D. Do as you please.

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Change, or the ability to (31) oneself to a changing environment is essential (32) evolution. The farmer whose land is required for housing or industry must adapt himself: he can transfer to another place and master the problems (33) to it; he can change his occupation, perhaps (34) a period of training; or he can starve to death. A nation which can't adapt its trade or defense requirements to (35) world conditions faces an economic and military disaster. Nothing is fixed and permanently stable. (36) must be movement forward, which is progress of a sort, and movement backward, which is decay and deterioration. In a changing world, tradition can be a force for good or for evil. (37) long as it offers a guide, it helps the ignorant and the uninformed to take a step (38) and, thereby adapt themselves to (39) circumstances. But if we make an idol of tradition, it ceases to be a guide. It becomes an obstacle (40) on the path of course. Man is to accept the help which tradition can give but to be well aware of its limitations in a changing world.

单选题Directions: For each blank in the following passage, choose the best answer from the choices given below. Mark your answer on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets. Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man. They do not provide energy, {{U}} {{U}} 1 {{/U}} {{/U}}do they construct or build any part of the body. They are needed for {{U}} {{U}} 2 {{/U}} {{/U}}foods into energy and body maintenance. There are thirteen or more of them, and if {{U}} {{U}} 3 {{/U}} {{/U}}is missing a deficiency disease becomes, {{U}} {{U}} 4 {{/U}} {{/U}} Vitamins are similar because they are made of the same elements—usually carbon, hydrogen, oxygen, and {{U}} {{U}} 5 {{/U}} {{/U}}nitrogen. They are different {{U}} {{U}} 6 {{/U}} {{/U}}their elements are arranged differently, and each vitamin {{U}} {{U}} 7 {{/U}} {{/U}}one or more specific functions in the body. {{U}} {{U}} 8 {{/U}} {{/U}}enough vitamins is essential to life, although the body has no nutritional use for {{U}} {{U}} 9 {{/U}} {{/U}}vitamins. Many people, {{U}} {{U}} 10 {{/U}} {{/U}}, believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body's vitamin needs.

单选题 Is there something as truth? For a good many centuries "the search for truth" has been {{U}}(31) {{/U}} the noblest activity of the human mind, but the seekers after truth have come to such {{U}}(32) {{/U}} conclusions that it often seems that very little progress has been made. {{U}}(33) {{/U}},there are many people who reel that we are actually going backward. They {{U}}(34) {{/U}}; often contemptuously, that we have accumulated more "knowledge" than our ancestors, but they think we are farther from the truth than ever, or even that we have {{U}}(35) {{/U}} the truth that we once possessed. If people look for anything long enough without finding it, the question naturally arises {{U}}(36) {{/U}} the thing is really there to find. You have seen a picture of an animal with a lion's head, a goat's body, and a serpent's tail—and maybe an eagle's wings for good {{U}}(37) {{/U}} There is plenty of evidence that each part of this animal {{U}}(38) {{/U}} --but there is no {{U}}(39) {{/U}} evidence that the parts ever occur in this combination. It is at least conceivable that the seekers after "truth" have made a similar mistake and invented an {{U}}(40) {{/U}} combination.

单选题Directions: For each blank in the following passage, choose the best answer from the choices given below. Mark your answer on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets. In November of 1902, President Theodore Roosevelt was on a hunting trip in Mississippi. His hunt was going {{U}} {{U}} 1 {{/U}} {{/U}}that day, and he couldn't seem to find anything worth of {{U}} {{U}} 2 {{/U}} {{/U}}his rifle. Then, his staff captured a black baby bear for the President to shoot, but he could not. The thought of shooting a bear that was tied to a tree did not seem sporting, so he {{U}} {{U}} 3 {{/U}} {{/U}}the life of the baby bear and set it free. Based on this story, a famous political cartoonist for the Washington Star drew a cartoon, which showed Teddy Roosevelt, rifle {{U}} {{U}} 4 {{/U}} {{/U}}, with his back turned on a cute(可爱的) baby bear. Morris Michtom, owner of a Brooklyn toy store, was {{U}} {{U}} 5 {{/U}} {{/U}}by the cartoon to make a stuffed baby bear. Intending it only as a display, he placed the stuffed bear in his toy store {{U}} {{U}} 6 {{/U}} {{/U}},and next to it placed a copy of the cartoon from the newspaper. To Michtom's surprise, his store was flooded by customers {{U}} {{U}} 7 {{/U}} {{/U}}to buy. He asked for and received President Roosevelt's {{U}} {{U}} 8 {{/U}} {{/U}}to use his name for the hand-sewn bears that he and his wife made, and the "Teddy Bear" was born! Michtom was soon manufacturing Teddy bear {{U}} {{U}} 9 {{/U}} {{/U}}the thousands. The money from the sate enabled him, in 1903, to {{U}} {{U}} 10 {{/U}} {{/U}}the Ideal Toy Company.

单选题Effective communication between a dog and its owner is______.

单选题 Many objects in daily use have clearly been influenced by science, but their form and function, their dimensions and appearances were determined by technologists, artisans, designers, inventors, and engineers-using nonscientific modes of thought. Many features and qualities of the objects that a technologist thinks about can't be reduced to unambiguous verbal descriptions; they are dealt with in the mind by a visual, nonverbal process. In the development of Western technology, it has been nonverbal thinking, by and large, that has fixed the outlines and filled in the details, and rockets exist not because of geometry or thermodynamics, but because they were first a picture in the minds of those who built them. The creative shaping process of a technologist's mind can be seen in nearly every artifact that exists. For example, in designing a diesel engine, a technologist might impress individual ways of non-verbal thinking on the machine by continually using an intuitive sense of tightness and fitness. What would be the shape of the combustion chamber? Where should be the valves played? Should it have a long or short piston? Such questions have a range of answers that are supplied by experience, by physical requirements, by limitations of available space, and not least by a sense of form Some decisions, such as wall thickness and pin diameter, may depend on scientific calculations, but the nonscientific component of design remains primary. Design courses, then, should be an essential element in engineering curricula, nonverbal thinking, a central mechanism in engineering design, involves perceptions, the stock-in-trade of the artist, not the scientist. Because perceptive processes are not assumed, to entail "hard thinking", nonverbal thought is sometimes seen as a primitive stage in the development of cognitive processes and inferior to verbal or mathematical thought. But it is paradoxical that when the staff of the Historic American Engineering Record wished to have drawings made of machines and isometric views of industrial processes for its historical record of American engineering, the only college students with the requisite abilities were not engineering students, but rather students attending architectural schools; If courses in design, which in a strongly analytical engineering curriculum provide the background required for practical problem-solving, are not provided, we can expect to encounter silly but costly errors occurring in advanced engineering systems. For example, early models of high-speed railroad cars loaded with sophisticated controls were unable to operate in a snowstorm because a fan sucked snow into the electrical system. Absurd random failures that plague automatic control systems are not merely trivial aberrations; they are a reflection of the chaos that results when design is assumed to be primarily a problem in mathematics.

单选题______ finish his homework, he would have come to class. A. If Mike could B. Were Mike able to C. Would Mike be able to D. If Mike had been able to

单选题 Because agriculture is so important to a nation's well-being, governments have always been concerned with it. For example, the United States and Canada have long produced surpluses that complicate their economies. Surpluses tend to lower prices to farmers and seriously endanger the agriculture industry. Governments have instituted systems of price supports to maintain a fair price when surpluses cause prices to drop. The system in the United States is a good example. A government program supports the prices paid to farmers for grains, and other agricultural products. Support prices are based on parity, which is the ratio between the prices farmers receive for their crops and the prices they must pay for things they need. The government selected the period from 1910 to 1914 as a time when farm prices were in a fair ratio with farming costs. This is the base period now used to determine parity prices. The idea is to assure farmers that what they get for a bushel of wheat will buy the same amount of, say, seed as it did in the years of the base period; if prices drop too far below this ideal the government can help in a number of ways. For example, it may buy much of a surplus at parity prices. Governments have instituted a wide variety of other controls for prices and, also, for farm output, mainly at the request of the farmers themselves. Farm prices tend to fluctuate more than other prices do, and the incomes of farmers fluctuate along with farm prices. Various measures for maintaining farm prices and incomes include tariff or import levies, import quotas, export subsidies, direct payment to farmers, and limitations on production. All of these measures are useful and are used to some extent by most developed countries. An important example of such a program is the soil-bank plan, which aimed at limiting production while improving farmland. The European Economic Community (EEC) established a common agricultural policy (CAP) for its member nations, called the Common Market countries. The aim is to create free trade for individual commodities within the community. When production of a commodity exceeds EEC consumption, the EEC may buy the excess for storage, pay to have it reprocessed, or export it to countries outside the Common Market. In this way the EEC can maintain its members' farm prices at levels equal to or even higher than those in such market-competitive nations as the United States and Canada.

单选题The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and in making such diverse things as cars, airplanes, and food containers, in 1979 Americans used over five million tons of new aluminum, and one and a half million tons of recycled aluminum. Some ninety percent of the bauxite (矾土) ore from which new aluminum is normally derived had to be imported to meet the demand. Poorer ores are abundant in the United States, however, and researchers at Purdue University may recently have found a way to obtain aluminum magnetically from these. Although aluminum is not attracted by ordinary magnets, under special conditions it becomes temporarily "paramagnetic", or very weakly responsive to a magnetic field. This is achieved by immersing ore particles in water to which certain salts have been added and then filtering the ore through steel wool in the presence of a strong magnetic field. It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import.

单选题New Yorkers watching the televised bombing of Baghdad yesterday said they were riveted by the raw and (1) display of American military might. But (2) , the bombing brought back particularly visceral and (3) memories. They (4) thinking about Sept. 11, and how New York, too, was once under assault (5) . On that day, Eva Temple, 47, was one of (6) people working in Lower Manhattan who (7) the rumbling dust cloud that accompanied (8) of the World Trade Center. And for (9) a few days after, she collected prayer cards (10) the street prophets and doomsday preachers whose advice she would ordinarily (11) . It made her feel better. Now, because of the war, Ms. Temple is collecting those cards again. She (12) to the war, yes, but (13) , she is frightened, and (14) New York will once again become a target. Yesterday, as bombs rained on a city 6,000 miles from New York, politicians and law enforcement officials (15) to prevent terrorism at home, much like the (16) they had taken immediately after Sept. 11. Security officials searching checked baggage at the American Airlines Terminal at La Guardia Airport found a gas mask and white powder in a suitcase belonging to a woman who (17) from Israel, raising concerns that the powder (18) a chemical or biological agent, officials said. (19) tests on the powder indicated that it contained anthrax spores, but later tests found that it did not, officials said. In the interim, officials closed part of the terminal near the ticketing area, but the woman (20) a flight for Dallas. When she landed, she was questioned by the F.B.I. and released, officials said.

单选题A : I wonder whether you could put my friend up for a few days? B : Tell me when. A : Next weekend actually. B:______ A. I' ve found it very easy. B. What are you doing here? C. Let me think it over, and I' ll tell you later. D. I' ve got an appointment at 11.

单选题I don't allow ______ in my class, nor do I allow my family ______ at home. A. to smoke...smoking B. smoking...to smoke C. to smoke...to smoke D. smoking...smoking

单选题Shortage of capital is the main factor that ______economic development.

单选题All the people who went to the new supermarket had one great hope: to be the lucky customer who did not have to pay for his shopping. For this was what the notice just inside the entrance promised. It said, "Remember, once a week, one of our customers gets free goods. This may be your lucky day!" For several weeks Mrs. White hoped, like many of her friends, to be the lucky customer. Unlike her friends, however, she never lost heart. Her kitchen was full of things which she did not really need. Her husband tried again and again to persuade her to give it up, but she just wouldn't listen. She dreamed of the day when the manager of the supermarket would come up to say, "Madam, this is your lucky day. Everything in your basket today is free." One Friday morning, after she had finished her shopping and had taken it to her car, she found that she had forgotten to buy some tea. She rushed back to the supermarket, got the tea and went to the desk to pay for it. As she was walking, she saw the manager of the supermarket coming up. "Madam," he said warmly, holding out his hand, "I want to congratulate you! You are our lucky customer today. Everything you've got in your basket is free./

单选题 Fear and its companion pain are two of the most useful things that men and animals possess,if they are properly used. If fire did not hurt when it burnt, children would play it until their handswere burnt away. Similarly, if pain existed but fear did not, a child would burn itself again andagain, because fear would not warn it to keep away from the fire that had burn it before. A reallyfearless soldier--and some do exist--is not a good soldier because he is soon killed; and a deadsoldier is of no use to his army. Fear and pain are therefore two guards without which men andanimals might soon die out. In our first sentence we suggested that fear ought to be properly used. If, for example, younever go out of your house because of the danger of being knocked down and killed in the street bya ear, you are letting fear rule you too much.Even in your house you are not absolutely safe: allairplane may crash on your house, or ants may eat away some of the beams in your roof so that thelatter falls on you, or you may get cancer ! The important thing is not to let fear rule you, but instead to use fear as your servant andguide. Fear will warn you of dangers; then you have to decide what action to take. In many cases,you can take quick and successful action to avoid the danger. For example, you see a car comingstraight towards you; fear warns you, you jump out of the way, and all is well. In some cases, however, you decide that there is nothing that you can do to avoid thedanger. For example, you cannot prevent an airplane crashing onto your house. In this case, fearhas given you its warning; you have examined it and decided on your course, of action, so fearof this particular danger is no longer of any use to you, and you have to try to overcome it.