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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单项选择题

It is implied in the first paragraph that ______.

A．eating more than usual might make us live longer
B．if we go on a diet when old, we may keep healthy
C．dieting might be needed
D．we have to diet in the early childhood if we want to live longer

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