38. For the time being, we do not know what causes people to

　　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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　　随着经济与社会的发展，中国人口结构发生了显著变化，逐渐步入老龄化社会。中国老年人口将持续增加，人口老龄化趋势将更加明显。为了应

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