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

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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 experts 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 not 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 less interesting 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 adj usted.“The point is,you need to do both,”Cohen says,“Intellectual activity actually influences brain cell health and size.”
The findings of James and other scientists in their work_________.

选项 A、constantly doing memory work
B、taking part in various mental activities
C、going through specific training
D、making frequent adj ustments

答案D

解析 据第3段的第1句话“许多专家相信经常刺激大脑是有益处的,于是他们要把这一理论在他们自己的生活中付渚实施。”这说明这种理论还不曾被前人验证过,这种理论正是他们研究的成果。答案是选项D。
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