(2013·安徽,21)From space, the earth looks blue.This is ________about seventy­one percent of its su

题目简介

(2013·安徽,21)From space, the earth looks blue.This is ________about seventy­one percent of its su

题目详情

(2013·安徽,21)From space, the earth looks blue.This is ________about seventy­one percent of its surface is covered by water.
A.whyB.howC.becauseD.whether
题型:单选题难度:中档来源:不详

答案

A
考查名词性从句。此处考查表语从句。根据句意:地球看起来是蓝色的。这是因为其表面71%是被水覆盖的。

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