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【单选题】

Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.

A．insane

B．infectious
C．foreign
D．poisonous
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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

22%的考友选择了B选项

70%的考友选择了C选项

3%的考友选择了D选项

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