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18 [单选题，1分] In the course of ___, some birds have lost their power of flight and started to live on land.A. evolutionB. explosionC. assumptionD. compensation

18 [单选题，1分] In the course of ___, some birds have lost their power of flight and started to live on land.

A. evolution

B. explosion

C. assumption

D. compensation

题目解答

答案

A. evolution

相关问题

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