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

Recent research into aging suggests that the body’ s defense mechanisms may lose the abili ty 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 abili ty 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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