2. 考研
  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 本题中，alien意为“外来的，不同的”。四个选项中，foreign意为“外国的，异质的”，如：a foreign object in the eye(眼睛中的异物)。insane意为“患精神病的，极度愚蠢的”；infectious意为“有传染性的，易感染的"。只有C项符合题意。
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