Read the following passage and choose the most likely answer to each of the following questions.
Researchers have established that when people are mentally engaged (投入的), biochemical (生物化学的) changes occur in the brain that allow it to act more effectively in cognitively (认知的) 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 of less interest than being able to maintain mental alertness. " Fozard and others say they challenge 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's health and size."
People who are cognitively healthy are those （ ）.
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
【正确答案】：C
【题目解析】：
本题考查文章中认知健康的人的特征。
定位到第一段第一句“研究人员已经证实，当人们处于精神活跃状态时，大脑中会发生生物化学变化，使其在注意力和记忆等认知领域更有效地发挥作用”可知，处于精神活跃状态的人认知相对健康。紧接着第三句“如果人们面对的信息能让他们思考他们感兴趣的事情，他们会保持（头脑）机敏且接受力强“可知，处于精神活跃状态的人（头脑）机敏且接受力强的。故结合这两句可以推断：认知健康的人是那些头脑机敏且接受力强的人，C选项符合题意。