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 03:05:29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】

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。