单项选择题

The CALERIE study is a turning point in the research field in ______.

A．studying the effect of calorie restriction on human beings instead of animals
B．having subjects with a wide range of age and weight
C．proving the positive effect of calorie restriction on prolonging people's life
D．excluding the positive effect of obesity reduction on keeping health
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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.
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
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