This hypothesis states that environments that are too clean may actually make the ______ system develop oversensitive responses.

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问题 This hypothesis states that environments that are too clean may actually make the ______ system develop oversensitive responses.

选项 A、mental
B、nervous
C、immune
D、physical

答案C

解析 mental心理的；nervous神经质的；immune免疫的；physical肉体的。

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在职申硕（同等学力）英语

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