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

試題分析：考查連接詞：Why為什么;how怎樣, 如何;because因?yàn)?whether是否. 句意:從太空中望去, 地球看起來是藍(lán)色的. 這是因?yàn)樗谋砻娲蠹s百分之七十被水覆蓋. Why在引導(dǎo)表語從句時(shí)強(qiáng)調(diào)結(jié)果， Because引導(dǎo)表語從句強(qiáng)調(diào)原因,結(jié)合語境可知選C.
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