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  3. Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act

Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act

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问题     Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive (认知的) areas such as attention and memory. This is true【C1】______of age.
    People will be alert and receptive【C2】______they are faced with information that gets them to think about things they are interested in. And someone【C3】______a history of doing more【C4】______than less will go into old age more cognitively【C5】______than someone who has not had an active mind.
    Many experts are so【C6】______of the benefits of challenging the brain【C7】______they are putting the theory to【C8】______in their own lives. "The idea is not【C9】______to learn to memorize enormous amounts of information," says James Fozard, associate director of an institute 【C10】______aging. "Most of us don’t need that kind of skill. Such【C11】______training is of less interest than being able to【C12】______mental alertness. " Fozard and others say they【C13】______their brains with different mental skills, both because they enjoy them and because they are sure that their range of activities will help the way their brains work.
    Gene Cohen, acting director of the same institute,【C14】______that people in their old age should【C15】______in mental and physical activities individually as【C16】______as in groups. Cohen says that we are frequently advised to keep physically active as we age, 【C17】______older people need to keep mentally active as well. Those who do are more【C18】______to maintain their intellectual abilities and to be generally happier and better【C19】______. "The point is: you need to do【C20】______," Cohen says. "Intellectual activity actually influences brain-cell health and size."
【C8】
选项 A、work
B、job
C、truth
D、fact
答案A
解析 惯用衔接题。put the theory to work为常用短语，指应用理论。此处是说把这一理论应用到他们自己的生活中，故答案为[A]work“应用”。
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