2. 外语
  3. ______ is medical technology that allows the prolongation of life artificially while the world is already over-populated?

______ is medical technology that allows the prolongation of life artificially while the world is already over-populated?

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问题 ______ is medical technology that allows the prolongation of life artificially while the world is already over-populated?
选项 A、Of what use
B、What use
C、Of which use
D、Which use
答案B
解析
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