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
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
单项选择题
According to the last two paragraphs, Spindler believes that ______.
A．calorie restriction is very important to young people
B．seeing the effect of a diet, people will eat less than normal
C．dieting is not a good method to give us health and a long life
D．drugs do not have the. effects of calorie restriction
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