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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单项选择题
From Dr Rattan's point of view, the results of calorie restriction in the CALERIE study ______.
A．were doubtable whether they were valid or not
B．did not show the effect in preventing age-related diseases
C．failed to prove the effect in increasing average lifespan
D．could not testify the effect in changing maximum lifespan
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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