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  3. The tendency of the human body to reject foreign matter is the main obstacle to

The tendency of the human body to reject foreign matter is the main obstacle to

游客2023-12-31  80
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、barrier
D、break
答案 C
解析 题干中的obstacle意为“妨碍”。A项“要素”；B项“成分”；C项“障碍”；D项“裂口”。只有C项与题干中划线单词意义相近。
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