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[范文]
On Aging Population
E......

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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
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
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