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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