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

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”。由句意可知，此处应填与障碍有关的一类词。故选D。
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