【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，地球是藍色的”之間是因果關系，故用because引導表語從句。

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