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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 areas such as attention and memory. This is true regardless of age.
     People will be alert and receptive if they are faced with information that gets them to think about things they are interested in. And someone with a history of doing more rather than less will go into old age more cognitively sound than someone who has not had an active mind.
     Many expert are so convinced of the benefits of challenging the brain that they are putting the theory to work in their own lives." The idea is no necessarily to learn to memorize enormous amounts of information," says James Fozard, associate director of the National Institute on Aging." Most of us don’ t need that kind of skill. Such specific training is of less interest than being able to maintain mental alertness." Fozard and others say they challenge 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, suggests that people in their old age should engage in mental and physical activities individually as well as in groups. Cohen says that we are frequently advised to keep physically active as we age, but older people need to keep mentally active as well. Those who do are more likely to maintain their intellectual abilities and to be generally happier and better adjusted." The point is, you need to do both," Cohen says," Intellectual activity actually influences brain-cell health and size."
People who are cognitively healthy are those______.
选项 A、who can remember large amounts of information
B、who are highly intelligent
C、whose minds are alert and receptive
D、who are good at recognizing different sounds
答案C
解析 文章的第一段介绍了研究人员的发现，即当人的大脑活动时，大脑内会产生某种化学变化，使得大脑在诸如注意力和记忆等感知区域的活动更加增强，因此当回答哪些人可称为在感知方面健康时，我们应该选择C。
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