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 peasants in India call for a reform on land ownership because ______.

A．they do not have enough fields to support their families
B．their interests are severely infringed by the fast expansion of urban areas
C．their rights to own a piece of land have been taken by the government
D．they are losing land without getting any money from the government

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