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

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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 本题中,stand-ins的意思是“替代品”。四个选项中,substitute的意思是“替身,替代品”,如:use plastics as a substitute for steel(用塑料做钢的代用品)。partner的意思是“合伙人,股东”;role-model的意思是“典型”;stand—by的意思是“后备人员”。只有D项符合题意。
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