Students learning about how life began on Earth may be presented with the perple

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问题 Students learning about how life began on Earth may be presented with the perplexing question, "Which came first, the chicken or the egg?"

选项 A、pressing
B、puzzling
C、patronizing
D、penetrating

答案 B

解析 perplexing 复杂的，令人困惑的；puzzling 使入迷惑的；pressing 紧迫的； patronizing屈尊俯就的；penetrating敏锐的，有洞察力的。

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