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【题目】From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.

A. why B. how C. because D. whether

【答案】C

【解析】查名词性从句。此处考查表语从句。根据句意:地球看起来是蓝色的。这是因为其表面71%是被水覆盖的。

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