. No one knows how largeuniverse is， butman has never given up the attempt to explore new

. 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

(答案→)A. the；/B. /; theC. /：/D. the； the解析： 略

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