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[单选题]
1.2 The central idea of the first paragraph is to____.(1分)
A
describe how to use lubrication
B
describe how to prolong the life of a machine
C
explain the nature of friction
D
tell how to offset the disadvantages of friction
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试题答案：
C
答案解释：
相关题目
To us it seems so natural to put up an umbrella to keep the water off when it rains, But actually the umbrella was not invented as protection against the rain, Its first use was as a shade against the sun!
The developed countries decided to___some money to supporting world economic growth.(1分)
Our country has _______ great changes in the past years , which are the result of reform and opening up.(1分)
24.Cars are an important part of life in th United States.Without a car, most people feel that they are poor.An even if a person is poor he doesn't feel really poor when he has a car.Henry Ford was the man who first started making cars in large numbers.He probably didn't know how much the car was going to affect American culture.The car made the Unite States a nation on wheels.And it helped make the United States what it is today.There are three main reasons the car became so popular in the United States.First of all,the country is a huge one and Americans like to move around in it.The car provides the most comfortable and cheapest form of transportation.With a car people can go any place without spending a lot of money.The second reason cars are popular is the fact that the United States never really developed an efficient and inexpensive form of public transportation.Long-distance have never been as common in the United States as they are in other parts of the world.Nowadays,there is a good system of air-service provided by planes.But it is too expensive to be used frequently.The third reason is the most important one,though.The American spirit of independence is what really made cars popular.Americans don't like to wait for a bus or a train or even a plane.They don't like to have to follow an exact schedule.A car gives them the freedom to schedule their own time.And this is the freedom that Americans want most to have.The gas shortage has caused a big problem for Americans.But the answer will not be a bigger system of public transportation.The real solution will have to be a new kind of car,one that does not use so much gas.(10分)24.1When do most Americans feel they are poor?(2分)A. When they don't have a carB. When they live in a huge countryC. When they don't planes.D. When they have a car
49. A) asked B) required C) expected D) hoped
6. (A)bought (B)obtain (C)purchasing (D)bring
Vocabulary and Structure Directions:In this part there are 30 incomplete sentences.For each sentence there are fourchoices marked A,B,C and D.Choose the ONE answer that best completes the sentence.Then blacken the corresponding letter on the Answer Sheet.
2. A. clear B. individual C. easy D.complex
6. A. in time B. by the way C. ahead of schedule D. by chance
Failure is never a pleasure, but it can have a ______ effect on your life once you learn to use it.(1分)
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《张中丞传后叙》驳斥“城之陷，自远所分始”这一错误论调时，使用的论证方法是
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20世纪后半叶兴起的垄断组织是（ ）
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39. 简述监督国家监察机关的主要途径。
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32．简述虚拟存贮器的工作原理。
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