【单选题】
This hypothesis states that environments that are too clean may actually make the ______ system develop oversensitive responses.
A.mental
B.nervous
C.immune
D.physical
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根据网考网移动考试中心的统计,该试题:
0%的考友选择了A选项
9%的考友选择了B选项
89%的考友选择了C选项
2%的考友选择了D选项