2. 考研
  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.

admin2012-07-24  32
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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