According to the text，mild exercise helps old people_________

单选题 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

参考答案D

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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单选题 It is learned from the text that high blood sugar may__________．

A．encourage brain cells to grow
B．result in poor concentration
C．affect physical activity
D．lead to memory loss

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单选题 Through“brain training，”old people can__________．

A．improve their physical balance
B．cope better with daily activities
C．cooperate better with each other
D．become skillful at using computers

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单选题 According to Florin Dolcos，when it comes to retirement，most old people tend to feel__________.

A．satisfied
B．depressed
C．hopeful
D．regretful

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