From space, the earth looks blue. This is about seventy-one percent of its surface is covered by wat

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编辑：chaxungu时间：2026-04-27 03:15:33分类：高中英语题库

【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

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【答案】C
【解析】句意：从太空看，地球看起来是蓝色的，这是因为它的表面的71%被水覆盖。A.why"为什么";B.how"怎样, 如何";C.because"因为";D.whether"是否". why在引导表语从句时强调结果;because引导表语从句强调原因,结合语境可知选C.