【題目】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

【答案】C
【解析】句意：從太空看，地球看起來是藍(lán)色的，這是因?yàn)樗谋砻娴?1%被水覆蓋。A.why"為什么";B.how"怎樣, 如何";C.because"因?yàn)?;D.whether"是否". why在引導(dǎo)表語(yǔ)從句時(shí)強(qiáng)調(diào)結(jié)果;because引導(dǎo)表語(yǔ)從句強(qiáng)調(diào)原因,結(jié)合語(yǔ)境可知選C.

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