No one has yet succeeded in explaining the ______ of how life began.

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问题 No one has yet succeeded in explaining the ______ of how life began.

选项 A、cause
B、confusion
C、reason
D、puzzle

答案D

解析句意：迄今还没有人能成功解释生命起源之谜。本题考查词义辨析。cause：原因，起因；confusion：混乱，困惑；reason：理由，缘故；puzzle：难题，迷惑。

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