单选题：Why does the author mention an elderly mouse in paragraph 27

题目分类：卫生类
题目类型：单选题
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题目内容：

Why does the author mention an elderly mouse in paragraph 27 A．To describe the influence of aging on mic
B．To illustrate the effect of meager food on mic
C．To tell US how mice’s liver genes behav
D．To inform us of the process of metabolizing drug

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