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[单选题]
_________in the countryside made Mr. Wilson very hardworking when he was still young.(1分)
A
Bringing up
B
Being brought up
C
Having brought up
D
Brought up
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试题答案：
B
答案解释：
解题思路：所缺成分在句子中充当主语，过去分词不能做主语，排除D 。Mr. Wilson应当是被教养，所以要用被动语态，所以排除A,C ，故选择B
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Reading Comprehension Directions:There are three passages in this part.Each passage is followed by some ques-tions or unfinished statements.For each of them there are four choices marked A,B,C and D. If the Dakota Access Pipeline(输油管道)is completed,it will carry nearly half a million bar-rels of oil across four states every day.Energy Transfer Partners(ETP),a Texas-based company behind the$3.8 billion project,hopes to finish construction this year.But the Standing Rock Sioux,an American Indian tribe(部落),is determined to stop the 1,172-mile pipeline from being built.(76)Both sides show no signs of backing down. The Dakota Access Pipeline was announced in 2014.A section of it will run near the Standing Rock Sioux reservation.A reservation is an area of land set aside for American Indians.The tribe says the construction threatens to destroy historical areas and ancient burial sites.They also say the pipeline could pollute their main water source,the Missouri River.In April,the Standing Rock Sioux began a protest against the project.They camped at the construction site.Since then,thou-sands of people,including people from American Indian tribes,have traveled to the site to join the protest. ETP says that the pipeline will have built-in safety measures to protect against oil leaks.Work-ers will also monitor it remotely,and will be able to close valves(阀)within three minutes if leaks are detected. American Indians have been staging a nonviolent protest for months.The protest took a turn last week when police were called to keep the peace between protesters and armed security guards hired by the company. (77)Twenty-eight people have been arrested since then and charged with interfering with the pipeline construction.
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
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