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【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，地球看起來是藍色的，這是因為它的表面的71%被水覆蓋。A.why"為什么";B.how"怎樣, 如何";C.because"因為";D.whether"是否". why在引導表語從句時強調結果;because引導表語從句強調原因,結合語境可知選C.

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