According to the text，mild exercise helps old people__________．

A．avoid a bad temper

B．feel happy with their life

C．practise creative thinking

D．improve their mental ability

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答案解析

推断题。由第四段第二句“Numerous studies have shown that gentle exercise three times a week can improve concentration and abstract reasoning in older people，perhaps by encouraging the growth of new brain cells．”可知，轻缓的锻炼能够帮助提高老年人的注意力和抽象思维的能力，也就是D项所说的“提高他们的大脑能力”，A项和B项所说的太过笼统，C项没有在文中出现，故选D。

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