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1.From space,the earth looks blue.This is    about seventy-one percent of its surface is covered by water.(  )
A.whyB.howC.becauseD.whether

分析 句意为: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.

解答 答案:C Why为什么;how怎样,如何;because因为;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,结合语境可知后半句强调原因,所以本题选C.

点评 本题需要根据题干的意思和前后两句之间的逻辑关系来判断使用哪个关联词.

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