. No one knows how large universe is， but man has never given

题干

. No one knows how large universe is， but man has never given up the attempt to explore new stars and new planets.

A．the；/

B．/; the

C．/：/

D．the； the

上一题下一题 0.85难度单项选择更新时间:2011-07-13 02:35:26

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