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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 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 Fazard, associate director of the National Institute on Aging." Most of us don’t need that kind of skill. Such specific training B 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."
What is the passage mainly about?
选项 A、How biochemical changes occur in the human brain.
B、Why people should receive special mental training as they age.
C、How intellectual activities influence brain health.
D、Why people should keep active not only physically but also mentally.
答案D
解析 大意判断题。本题询问的是本文的主题思想。文章通篇讨论的是为什么在保持身体活力的同时，还必须保持大脑的活力，即告诉人们保持大脑健康的重要性。作者首先指出，人在用脑时，大脑会处于兴奋状态，这时大脑在诸如注意力和记忆力等属于认知领域的能力会有效地得以发挥。接着，作者谈及勤于动脑的重要性。勤于动脑的人即使到了老年，仍能保持心理健康。最后，作者指出，老年人不仅要坚持锻炼身体，而且要勤于动脑，只有这样才能保持身心健康，提高生活质量。尤其是在文章最后一段，作者通过Gene Cohen的话指出老年人应参加个人或集体的体力和脑力锻炼，而且人们需要同时注意脑力及体力的锻炼。由此可见，本文讨论的是为什么人们应该积极进行体力及脑力锻炼，故选项D为正确答案。
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