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
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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
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