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

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

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问题 Recent research into aging suggests that the body’ s defense mechanisms may lose the ability to distinguish what is alien.
选项 A、foreign
B、insane
C、infectious
D、poisonous
答案A
解析 句意：对衰老方面的最近研究表明，身体的防御机制可能会失去辨别异已的能力。alien异已的，陌生的。foreign异体的，外来的。insane极愚蠢的，精神病的。infectious传染的，传染性的。poisonous有毒的。
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