39. It is hard to determine whether people who are free from dementia

　　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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　　Directions: For this part, you are allowed 30 minutes to write an essay that begins with the sentence With

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