40. There is evidence that learning foreign languages might be

　　39 It is hard to determine whether people who are free from dementia tend to have more social activities,

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　　38 For the time being, we do not know what causes people to lose their cognitive abilities, or what we ca

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　　37 According to estimates, the number of people who speak two languages or more is greater than those who

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　　36 Research indicates that brain training is likely to boost one& 39;s ability at specific tasks, but not on

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　　Modern U S cities were designed to make exercise unnecessary Cars and elevators once symbolized urban areas

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