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【题目】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】句意:从太空看,地球是蓝色的。这是因为地球表面大约71%都被水覆盖着。本题考查表语从句。A:为什么;B:怎么样;C:因为;D:是否。根据句意应选C

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