【題目】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:從太空看，地球是藍(lán)色的。這是因為地球表面大約71%都被水覆蓋著。本題考查表語從句。A:為什么；B:怎么樣；C:因為；D:是否。根據(jù)句意應(yīng)選C。

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