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we humans are alone in the universe,scientists have scanned the sky for outer sp

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we humans are alone in the universe,scientists have scanned the sky for outer sp

we humans are alone in the universe,scientists have scanned the sky for outer space signals and sent messages out into space.

A、We wonder if　 B、Having known that

C、To find out whether　 D、Not knowing why

 

试题答案

C

标签：skyforhavescannedsignals

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