2. 外语
  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 (认知的) areas 【C1】_____ attention and memory.
    This is true regardless of age.
    People will be alert and receptive 【C2】_____ they are faced with information that 【C3】_____ them to think about things they are interested in. And someone 【C4】_____ a history of doing more 【C5】_____ than less will go into old age more cognitively 【C6】_____ than someone who has not had an active mind.
    Many experts are so 【C7】_____ of the benefits of challenging the brain 【C8】_____ they are putting the theory to 【C9】_____ in their own lives. "The idea is not 【C10】_____ to learn to memorize enormous amounts of information," says James Fozard, associate director of the National Institute 【C11】_____ Aging.
    "Most of us don’t need that kind of skill. Such specific 【C12】_____ is of less interest than being able to maintain mental 【C13】_____. " Fozard and others say they challenge their brains work.
    Gene Cohen, acting director of the same institute, 【C14】_____ that people in their old age should 【C15】_____ in mental and physical activities 【C16】_____ as well as in groups. Cohen says that we are frequently advised to keep physically active as we age, 【C17】_____ older people need to keep mentally active as well. Those who do are more 【C18】_____ to maintain their intellectual abilities and to be generally happier and better 【C19】_____. "The point is, you need to do 【C20】_____ ." Cohen says, "Intellectual activity actually influences brain-cell health and size."
【C7】
选项 A、believed
B、convinced
C、supposed
D、concerned
答案B
解析 考查动词语义。下文提到了很多专家向大脑提出挑战这一事实，表明他们相信挑战大脑有好处，convinced“确信的”，符合文意，故选B。believe也表“相信”，但用过去分词形式时表示的是被动语态，不是可作表语的形容词性质，所以排除A。
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