Recent research into aging suggests that the body’s defense mechanisms may lose the ability to distinguish what isalien.

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问题 Recent research into aging suggests that the body’s defense mechanisms may lose the ability to distinguish what isalien.

选项 A、insane
B、infectious
C、foreign
D、poisonous

答案C

解析  画线词alien.意为外国的,外来的,异己的,与foreign同义。辨义:A.insane疯狂的; B.infectious感染的;D.poisonous有毒的。
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