【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】

試題分析:考查表語從句。語境中“地球表面約71%被水覆蓋”和“從太空上看,地球是藍(lán)色的”之間是因果關(guān)系,故用because引導(dǎo)表語從句。

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