2. 外语
  3. Scientific advances have made transplants possible that were ________ even a few years ago, ushering in an era where social and

Scientific advances have made transplants possible that were ________ even a few years ago, ushering in an era where social and

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问题 Scientific advances have made transplants possible that were ________ even a few years ago, ushering in an era where social and ethical considerations take center stage.
选项 A、unjustifiable
B、unintentional
C、unsustainable
D、unimaginable
答案D
解析 本题考查形容词含义。A不合道理的，不能分辨的；B非故意的，无意识的；C不能持续的，无法维持的；D不可思议的，难以想象的。该句的大意为：科学进步使数年前无法想象的器官移植成了可能，从而迎来了一个以社会责任和道德准则为中心的时代。
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