单项选择题

The elderly mouse mentioned in paragraph two shows ______.

A．mice are also influenced by old age
B．mice that eat meager food live longer
C．how mice' s liver genes behave
D．how to metabolize drugs
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单项选择题
According to the passage, the researchers are interested in ______.
A．the mice that started dieting in old age
B．27 of those 46 old genes that continued to behave like young genes
C．calorie restriction that works in people
D．dieting that makes sure a drug is effective
单项选择题
It can be inferred from the passage that completely normally fed mice ______.
A．will not experience free radical production
B．will experience more genetic rejuvenation in their lifetime
C．have more old liver genes to behave like young genes
D．are more likely to suffer from inflammation
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