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[单选题]
In the 17th century, people believed that the earth was flat and ship would fall off the ______.(1分)
A
boundary
B
border
C
edge
D
limit
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试题答案：
C
答案解释：
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27. What is the author’s attitude toward the current breast cancer research?
3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A.an opposing force of motion exists B.the energy is wastedC. everything is motionlessD.a complicated machine is supplied with energy
2.2 Which of the following makes a person feel stressed before going on holiday?____(1分)
3. Washington Irving wasAmerica's first man of letters toBe known internationally. His works were received enthusiasticallyBoth in EnglandAnd in the United States. He was, in fact, one of the most successful writers of his time in eitherCountry,DelightingA large general publicAndAt the same time winning theAdmiration of fellow writers like Scott inBritainAnd PoeAnd Hawthorne in the United States. The respect in which he was held was partly owing to the man himself, with his warm friendliness, his good sense, his urbanity (温文有礼), his gay spirits, hisArtistic integrity (诚笃), his love ofBoth the Old WorldAnd the New. ThackerayDescribed IrvingAs "a gentleman, who, though himselfBorn in no very high sphere, was most finished, polished, witty; socially the equal of the most refined Europeans." In England he was grantedAn honoraryDegree from Oxford -An unusual honor forACitizen ofA young, uncultured nation --And he received the medal of the Royal Society of Literature;America made himAmbassador to Spain.Irving'sBackground provides little to explain his literaryAchievements.A giftedButDelicateChild, he had little schooling. He studied law,But without zeal,And neverDid practice seriously. He was immune to his strict Presbyterian home environment, frequentingBoth social gatheringsAnd the theater.31. The passage mainly tells us____.A. why Washington IrvingAchieved literary successB. how IrvingBecame successfulC. why Irving moved from literature to politicsD. that IrvingAchieved great successAnd enjoyed international fame
People here are really nice and____. They invite you to their homes for Sunday dinner.
23.4 The article does not say whether the scientists’ experiments with dogs have ________.(2分)
The new library _______ we visited yesterday is very modern.(1分)
23.4 The article does not say whether the scientists’ experiments with dogs have ________.(2分)
To give a detailed account of the effect of the birth control policy, you may consult the____ on population issued by the government.
As to your second question, I am afraid I can give you no information at the moment, as the matter is still____ consideration.
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