单项选择题

What can we learn about the subjects in the CALERIE study

A．They were selected by the National Institutes of Health.
B．They were divided into two groups according to their sex and age.
C．Half of them became thinner after the study.
D．They received periodical medical checks during the 6 months.
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单项选择题
It can be inferred from the first paragraph that ______.
A．an effective calorie restriction involves taking little food while doing much exercise
B．calorie restriction is proved to be effective in preventing illness in some animals
C．some drugs are taken by people to live longer without suffering from starvation
D．before the 1930s,people did not believe in the positive effect in extending lifespan
单项选择题
According to Cynthia Kenyon, anti-aging drugs in the future will ______.
A．extend the average and maximum lifespan
B．be useful to test Dr Rattan's hypothesis
C．cure some diseases related to aging
D．be taken to study their side effects
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