2. 外语
  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、insane
B、infectious
C、foreign
D、poisonous
答案C
解析 insane患精神病的，极度愚蠢的；infectious有传染性的，易感染的；foreign外国的，异质的；alien外来的，不同的。
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