2. 外语
  3. Researchers have established that when people are mentally engaged, biochemical changes【S1】______in the brain that allow it to a

Researchers have established that when people are mentally engaged, biochemical changes【S1】______in the brain that allow it to a

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问题     Researchers have established that when people are mentally engaged, biochemical changes【S1】______in the brain that allow it to act more effectively in cognitive(认知的)areas such as attention and【S2】______.This is true regardless of age.
    People will be alert(警觉的)and receptive(接受能力强的)if they are faced with information that gets them to think about things they are【S3】______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【S4】______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【S5】______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【S6】______training is of less interest than being able to maintain mental【S7】______." Fozard and others say they challenge their brains with different mental skill, 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【S8】______in mental and physical activities individually as well as in groups. Cohen says that we are frequently advised to keep【S9】______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【S10】______brain-cell health
                                                 Word Bank

A)active                                 I)specific
B)physically                             J)alert
C)occur                                  K)interested
D)engage                                 L)advise
E)changes                                M)challenge
F)memory                                 N)necessarily
G)mind                                   O)alertness
H)influences
【S1】
选项
答案C
解析 此空应填入一个动词，意思是“生物化学变化在大脑中 ______”，D、L、M皆不符合题意，H形式不对，故选occur指“变化发生”。
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大学英语四级

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