The tendency of the human body to reject foreign matter is the main obstacle to successful organ transplantation.

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问题 The tendency of the human body to reject foreign matter is the main obstacle to successful organ transplantation.

选项 A、factor
B、constituent
C、break
D、barrier

答案D

解析 obstacle阻碍,障碍。factor因素,要素;constituent成分,组成要素;break破损,破裂;barrier障碍,阻碍。故答案选D。
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