【題目】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】查名詞性從句。此處考查表語從句。根據(jù)句意：地球看起來是藍色的。這是因為其表面71%是被水覆蓋的。

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