When any non-human organ is transplanted into a person, the body immediately recognizes it as ______.

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问题 When any non-human organ is transplanted into a person, the body immediately recognizes it as ______.

选项 A、external
B、strange
C、alien
D、foreign

答案D

解析 句中it指代前面提到的non-human organ。external“外部的,外面的,对外的”,如external causes(外因);strange“奇怪的”;alien“与……不同的,外国的,来自其他星球的”;foreign表示“外来的,异质的,处于身体不正常或不合适位置的”。根据句意,选D。
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