3. 让他人等很久是不礼貌的。（It's impolite to do sth.)
3.It's impolite to keep others waiting so long.
阅读快车系列答案科目：初中英语 来源： 题型：
As we know,we are short of water. It seems strange that about 3/4 of the surface of the earth is covered with water, but why are we still short of water? Because about 3% of water on the earth is fresh water which we can drink or use for watering plants directly. The rest is sea water.
With the development of the modern society，we need more water. But how can we avoid the serious water shortage? First, we should learn how to save every drop of water. Second, we should find out the ways to reuse it. Some scientists have studied in this field for many years. Now people use water only once in most big cities. But people should use it again. For example，don't pour away the water that you have used，for you can use it to wash vegetables or fruits. You can use it to clean the floor,the windows or the toilet. Even if every large city reuses its water, we still have no enough water. What should we do next?
The sea seems the best answer. There is a lot of water in the sea. All that we need to do is to make the salt out of sea water. But this process costs too much. Scientists are trying to find a cheaper way of doing it. If we find a proper way，we'll not worry about the danger of water shortage.
根据短文内容，选择最佳答案。
( ) 1. About of water on the earth is sea water.
A. 30% B. 97%
C.3/4 D. 1/4
( ) 2. How many tips that we need to do to avoid water shortage are mentioned in the passage？
A. 5. B.4.
C.3. D.2.
( ) 3. People in most big cities should
A. reuse water
B. use water once
C. pour water directly
D. use water to clean the floor
( ) 4. Which is NOT true according to the passage?
A. We are still short of water.
B. People are always finding ways to reuse water.
C. We have avoided water shortage.
D. Most water on the earth is sea water.
( ) 5. The passage is about .
A. how to solve the water shortage
B. how to change sea water into fresh water
C. what we should do to save water
D. what fresh water is
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2. In Colombia,they often __________ _______ (顺便拜访)their friends' homes if they have time.
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( ) 1. The students ought to wear school uniforms when they're at school.(同义替换)
A. are supposed to B. are allowed to
C. would like to D. love to
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( ) 3. — The ship sinking of Korea teaches us to care for ourselves and the people around us.
—So it is. life is the most important to everyone.
A. For example B. At last
C. After all D. Finally
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( ) 10. When you supposed to the meeting yesterday?
A. were;had B. was;had
C. were;have D. was;have
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