问题 选择题

We know that about seventy percent _____ the earth _____ covered by water.

A./; is

B.of; are

C.of; is

D.about; are

答案

答案:C

题目分析:句意:我们都知道70%的土地都被水覆盖。百分数+名词做主语,谓语动词的选择要根据这个名词而定。本题中earth是不可数名词,因此谓语动词要用单数。故选C。

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