2. 外语
  3. The world is not only hungry; it is also thirsty for water. This may seem strange to you because nearly 75% of the earth’s surfa

The world is not only hungry; it is also thirsty for water. This may seem strange to you because nearly 75% of the earth’s surfa

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问题     The world is not only hungry; it is also thirsty for water. This may seem strange to you because nearly 75% of the earth’s surface is covered with water. But about 97% of this huge amount is seawater or salt water. Man can only drink and use the other 3%—the freshwater that comes from rivers, lakes, underground, and other sources. And we cannot use all of that, because some of it is in the form of iceberg and glaciers (冰河). Even worse, some of it has been polluted.
    However, as things stand today, this small amount of fresh water, which is constantly being replaced by rainfall, is still enough for us. But our need for water is increasing rapidly almost day by day. Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry.
    We all have to learn how to stop wasting our precious water. One of the first steps we should take is to develop ways of reusing it. Experiments have already been done in this field, but only a small scale. The systems that have been worked out resemble those used in spacecraft.  
This passage mainly tells about ______.
选项 A、water and the earth
B、fresh water on earth
C、water shortage problem
D、water and food shortage
答案C
解析 主旨大意题。该文章首先说明了水资源短缺的现状及原因，从而让人类认识到问题严重性，最后给出相应的解决措施。由此可见，整篇文章主要在说明水资源短缺的问题。
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本试题收录于： 大学英语三级B级题库大学英语三级分类
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