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    From space, the earth looks blue. This is      about seventy-one percent of its surface is covered by water.
    A．whyB．howC．becauseD．whether
    C
    why为什么;how怎样, 如何;because因为;whether是否. 句意:从太空中望去, 地球看起来是蓝色的. 这是因为它的表面大约百分之七十被水覆盖. why在引导表语从句时强调结果，如: She was ill. That’s why she was sent to the hospital. 她病了，所以被送到医院来(那就是她为什么被送到医院的原因)。Because引导表语从句强调原因,结合语境可知选C.
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