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  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

admin2010-03-03  59
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.  
The percentage of the earth’s surface that NOT covered with water is______.
选项 A、75%
B、25%
C、97%
D、3%
答案B
解析 事实细节题。由题干中的线索词earth’s surface和covered with water定位到文章第一段第三句。原文说75%的地球表面被水覆盖，经过简单运算，那么地球表面没有被水覆盖的地区应占25%。
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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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