(2013·安徽，21)From space, the earth looks blue.This is ________about seventy－one p
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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.| A．why | B．how | C．because | D．whether |
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答案
| C |
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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