From space, the earth looks blue. This is ____about seventy-one percent of its s
题型：不详难度：来源：
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：考查连接词：Why为什么;how怎样, 如何;because因为;whether是否. 句意:从太空中望去, 地球看起来是蓝色的. 这是因为它的表面大约百分之七十被水覆盖. 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. |
举一反三
It’s much easier to make friends____ you have similar interests.| A．unless | B． when | C．even though | D．so that |
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______ I always felt I would pass the exam, I never thought I would get an | A．While | B．Unless | C．If | D．Until |
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--- Daddy, I don’t want to go to Jimmy’s birthday.
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