The world is not hungry , but it is thirsty . It seems strange that nearly 3/4 of the eart

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.
【小题1】The world is thirsty because .A．3/4 of the earth is covered with waterB．we have enough sea water to use directlyC．we haven't used all the water in rivers and lakesD．about 97% of water on the earth can't be drunk or used for watering plants directly【小题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.【小题3】From the passage we learn .A．if every city reuses its water, we'll be in no danger of drying upB．man can only drink and use about 25% of water on the earthC．today in most large cities water is used only onceD．water can be used only once【小题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.【小题5】The name of the passage would be A．The Sea Water 　　　B．How to Save Water　C．The Thirsty WorldD．The Polluted WaterD

(答案→)D 解析：地球不仅是饥饿的还是干渴的，因为我们只能使用全球水分的3%。为了避免缺水，我们首先要节约用水，其次是要找到再利用水的方法。最好的答案是从海水中分离出盐，但是这个方法成本很高。科学家们还在不断努力以找到经济有效的办法。【小题1】细节理解题。短文第一段提出了问题，也给出了答案Because about 97% of water on the earth is sea water which we can't drink or use for watering plants directly.“因为地球上97%的水是海水，我们不能直接饮用或用它们来浇灌植物。”所以答案是D。【小题2】推理判断题。短文说到：Man can only drink and use the 3% - the water that comes from rivers and lakes“人们只能饮用和利用其中的3%，这3%的水来自河流和湖泊”。因此河流和湖泊的水只占全球水的3%，故选A。【小题3】细节理解题。Today, in most large cities water is used only once and then runs to the sea or rivers .“今天，在大多数大城市水只是利用过一次就流入大海和河流”。由此可知，答案是C。【小题4】细节理解题。短文最后一段说最好的答案就是海洋，就是从海水中提出盐，但是很贵，科学家们在寻找廉价的办法从海水中提出盐。所以，找到便宜的办法才是最重要的。故选D。【小题5】细节理解题。短文先介绍了地球的水资源很有限，接着讲了避免水缺乏的方法。所以文章的主题中心词就是thirsty，故选C。

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