Clouds are formed from ______. What percentage of the total earth’s water does underground water make up?

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问题 Clouds are formed from ______.
What percentage of the total earth’s water does underground water make up?

选项 A、0.05%.
B、0.5%.
C、4.5%.
D、5%.

答案C

解析推理题。本题要求回答“地下水占地球总水量的百分之多少?”文章的第二段的三、四、五句话表明：地球上百分之九十五的水在海洋，百分之五的水在陆地，但只有百分之零点五的水在陆地表面的河与湖里，其余的是地下水，因此地下水为5%-0.5%=4.5%。故选C。

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大学英语三级B级

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