Why does the author mention an elderly mouse in p
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Why does the author mention an elderly mouse in paragraph 2?
A.To describe the influence of old age on mice.
B.To illustrate the effect of meager food on mice.
C.To tell us how mice’s liver genes behave.
D.To inform us of the process of metabolizing drugs.
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答案：B
第二段提及“一只高龄老鼠”的时候，作者谈到，“只要连续四周限制一些衰老的老鼠进食，它们的肝脏基因就会变得和衰老前一样充满活力”。据此，“为了阐明节食对老鼠所产生的影响”最好地回答了题干中的问题。