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 02:45:09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，地球是蓝色的。这是因为地球表面大约71%都被水覆盖着。本题考查表语从句。A:为什么；B:怎么样；C:因为；D:是否。根据句意应选C。