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.

admin2011-02-26  35
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
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