It can be inferred from the first paragraph that ______. [br] From Dr Rattan’s p

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问题 It can be inferred from the first paragraph that ______. [br] From Dr Rattan’s point of view, the results of calorie restriction in the CALERIE study ______.

选项 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

答案 D

解析根据题干Dr. Rattan定位到原文第五段。第二句指出Dr. Rattan的观点是“衰老和寿命是两个不同的概念”，可以避免一些老年疾病的出现并不等同于可以突破人寿命的极限，D与之相符。第五段第二句说明Dr. Rattan不怀疑实验结果的真实性，认为calorie restriction可能有助于老年人增强体质，从而延长人们的平均寿命，故分别排除A、B和C。

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