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(2013·安徽,21)From space, the earth looks blue.This is ________about seventy?one percent of its surface is covered by water.

Awhy Bhow Cbecause Dwhether

 

A

【解析】考查名词性从句。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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