单选题：According to the passage, we do not know whether humans will

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题目类型：单选题
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题目内容：

According to the passage, we do not know whether humans will benefit from taking in fewer calories partly because______. 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.

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答案解析：

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