(2013·安徽，21)From space, the earth looks blue.This is ________about seventy－one percent of its surface is covered by water.
A．whyB．howC．becauseD．whether
C
考查名詞性從句。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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