The world is not hungry , but it is thirsty . It seems strange that nearly 3/4 of the earth is covered with water while we say we are short of water. Why? Because about 97% of water on the earth is sea water which we can't drink or use for watering plants directly. Man can only drink and use the 3% - the water that comes from rivers and lakes. And we can't even use all of that, because some of it has been polluted .
　　Now more water is needed. The problem is: Can we avoid (避免) a serious water shortage later on? First, we should all learn how to save water. Secondly, we should find out the ways to reuse it . Scientists have always been making studies in the field. Today, in most large cities water is used only once and then runs to the sea or rivers . But it can be used again. Even if every large city reused its water, still there would not be enough. What could people turn to next?
　　The sea seems to have the best answer. There is a lot of water in the sea. All that needs to be done is to get the salt out of the sea water. This is expensive, but it's already used in many parts of the world. Scientists are trying to find a cheaper way of doing it. So you see, if we can find a way out, we'll be in no danger of drying up.
小題1:The world is thirsty because ________.
A．3/4 of the earth is covered with water
B．we have enough sea water to use directly
C．we haven't used all the water in rivers and lakes
D．a(chǎn)bout 97% of water on the earth can't be drunk or used for watering plants directly
小題2:Which of the following is true ?
A．3% of water on the earth is in rivers and lakes.
B．75% of water on the earth is the sea.
C．97% of the earth is covered with water.
D．3% of water on the earth is sea water.
小題3:From the passage we learn _________.
A．if every city reuses its water, we'll be in no danger of drying up
B．man can only drink and use about 25% of water on the earth
C．today in most large cities water is used only once
D．water can be used only once
小題4:To avoid the serious water shortage , which of the following is the most important?
A．Save water and try to make good use of the water in rivers and lakes.
B．Don't pollute water and keep all rivers and lakes clean.
C．Make dirty water clean and then reuse it.
D．Try to find a cheaper way to get the salt out of the sea water.
小題5:The name of the passage would be ________
A．The Sea Water 　　　B．How to Save Water　
C．The Thirsty WorldD．The Polluted Water

小題1:D
小題2:A
小題3:C
小題4:D
小題5:C

試題分析：地球不僅是饑餓的還是干渴的，因?yàn)槲覀冎荒苁褂萌蛩值?%。為了避免缺水，我們首先要節(jié)約用水，其次是要找到再利用水的方法。最好的答案是從海水中分離出鹽，但是這個方法成本很高。科學(xué)家們還在不斷努力以找到經(jīng)濟(jì)有效的辦法。
小題1:細(xì)節(jié)理解題。短文第一段提出了問題，也給出了答案Because about 97% of water on the earth is sea water which we can't drink or use for watering plants directly.“因?yàn)榈厍蛏?7%的水是海水，我們不能直接飲用或用它們來澆灌植物。”所以答案是D。
小題2:推理判斷題。短文說到：Man can only drink and use the 3% - the water that comes from rivers and lakes“人們只能飲用和利用其中的3%，這3%的水來自河流和湖泊”。因此河流和湖泊的水只占全球水的3%，故選A。
小題3:細(xì)節(jié)理解題。Today, in most large cities water is used only once and then runs to the sea or rivers .“今天，在大多數(shù)大城市水只是利用過一次就流入大海和河流”。由此可知，答案是C。
小題4:細(xì)節(jié)理解題。短文最后一段說最好的答案就是海洋，就是從海水中提出鹽，但是很貴，科學(xué)家們在尋找廉價的辦法從海水中提出鹽。所以，找到便宜的辦法才是最重要的。故選D。
小題5:細(xì)節(jié)理解題。短文先介紹了地球的水資源很有限，接著講了避免水缺乏的方法。所以文章的主題中心詞就是thirsty，故選C。
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小題2:
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