2. 专升本
  3. No one has yet succeeded in explaining the ______ of how life began.

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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