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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】

    试题分析：考查表语从句。语境中“地球表面约71%被水覆盖”和“从太空上看，地球是蓝色的”之间是因果关系，故用because引导表语从句。

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