Ronald Kahn and his colleagues can make mice live longer by According to the passage, we do not know whether humans will benefi

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问题 Ronald Kahn and his colleagues can make mice live longer by
According to the passage, we do not know whether humans will benefit from taking in fewer calories partly because

选项 A、humans, worms and rodents are different.
B、most people are not willing to be put on a strict diet.
C、the effect is not known.
D、genetic changes in tissues can not be performed on humans.

答案B

解析
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