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[单选题]
The thief ran away at the _______ of a policeman.(1分)
A
screen
B
scenery
C
sight
D
seeing
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参考答案
试题答案：
C
答案解释：
解题思路： 1. 本题考查介词词组搭配。“at the sight of”意为“一看见”，故答案选C)选项。
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2. In the United States, the traditional school year is September to June. Summer school used to be seen mainly as a place for high school students to repeat classes they failed. But summer programs have expanded. Students often go to summer school so they can ease their class load during the school year. Or, it might give them more freedom to choose the classes they want during the regular term.Summer school students do the same amount of work as if they took the class during the school year. But they do it in a much shorter time—just one to two months. They generally attend school for three to four hours every morning, five days a week. Another choice for many students is to take classes online. Students work by computer at home or wherever they have an Internet connection. They could even be traveling with their families. However, some online classes require students to come to a classroom to take tests. Students may also have to take part in group discussions with the teacher online. And there may be a required number of hours to spend logged on each day. Yet there may also be freedom to do the work anytime, day or night.(5分)2.1 A student in the United States doesn’t need to attend school in ______.(1分)A. MarchB. AugustC. DecemberD. February
A local citizen said it was that the fire ,which broke out at midnight ,was caused by someone on purposE.(1分)
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 existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
1.Man is, at one the same time, a solitary being a social being. 2.As a solitary being, he attempts to protect his own existence that of those who are closest to him, to satisfy his personal desires, to develop his inborn abilities. 3.As a social being, he seeks to gain the recognition affection of his fellow human beings, to share in their pleasures, to comfort them in their sorrows, to improve their conditions of life. 4.Only the existence of these varied, frequently conflicting strivings accounts for the special character of a man, 5.their specific combination determines the extent to which an individual can achieve an inner balance can contribute to the well-being of society.
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3.4Which of the following is not true?____(1分)
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