2. 外语
  3. The world is not only hungry, but thirsty for water. That may seem【B1】______to you, since nearly 75% of the earth’s surface is【B

The world is not only hungry, but thirsty for water. That may seem【B1】______to you, since nearly 75% of the earth’s surface is【B

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问题     The world is not only hungry, but thirsty for water. That may seem【B1】______to you, since nearly 75% of the earth’s surface is【B2】______with water, but about 97% of this【B3】______amount is sea water, or salt water. Man can only drink and use the other 3%—the fresh water from rivers, lakes, underground, and other【B4】______. And we cannot even use all of that, because some of it is in the form of【B5】______and glaciers. Even worse, some of it has been【B6】______.
    However, this small amount of fresh water is still enough for us, but our need for water is increasing 【B7】______. Only if we take steps to deal with the problem now can we avoid a【B8】______worldwide water shortage later on.【B9】______. Today water is used only once and then discharged into a sewer system, and it eventually returns to the sea or runs into underground storage tanks. It is possible to pipe used water to a purifying plant.【B10】______.
    Even if every large city purified and reused its water, we still would not have enough.【B11】______. If we take these steps, we’ll be in no danger of drying up!
【B10】
选项
答案There it can be filtered and treated with chemicalsso that it can be used again
解析 filtered，treated with，chemicals，used again
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大学英语四级

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