The passage mainly discusses ______. The reason a nose is not likely to turn into a kidney is that ______.

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问题 The passage mainly discusses ______.
The reason a nose is not likely to turn into a kidney is that ______.

选项 A、cells in the nose do not contain instructions
B、a nose does not contain brain cells
C、instructions in a nose cell are inactivated
D、the stem cells have not been specialized

答案C

解析
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