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

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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