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

 

C

【解析】考查表語(yǔ)從句。根據(jù)句意：地球看起來(lái)是藍(lán)色的。這是因?yàn)槠浔砻?1%是被水覆蓋的

 

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