Chimpanzees are frequently used as stand-ins for human beings in experiment.A、pa

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问题 Chimpanzees are frequently used as stand-ins for human beings in experiment.

选项 A、partners
B、role-models
C、stand-bys
D、substitute

答案 D

解析 partner合伙人，股东。role-model典型。stand-by后备人员。substitute替身，替代品。stand-ins替代品。

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