2. 外语
  3. Researchers have established that when people are mentally【C1】______biochemical changes occur in the brain that allow it to【C2】_

Researchers have established that when people are mentally【C1】______biochemical changes occur in the brain that allow it to【C2】_

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问题     Researchers have established that when people are mentally【C1】______biochemical changes occur in the brain that allow it to【C2】______more effectively in cognitive (认知的) areas such as attention and memory. This is true【C3】______age.
    People will be alert and【C4】______if they are faced with information that【C5】______them to think about things they are【C6】______in. And someone with a history of doing more【C7】______less will go into old age more cognitively sound than someone who has not had an active 【C8】______.
    Many experts are so convinced【C9】______the benefits of challenging the brain that they are【C10】______the theory to work in their own lives. "The idea is not【C11】______to learn to memorize enormous【C12】______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【C13】______less interest than being able to maintain mental【C14】______." Fozard and others say they challenge their brains with different mental skills,【C15】______because they enjoy them and because they are sure that their range of activities will help the【C16】______their brains work.
    Gene Cohen, acting director of the same institute, says that we are frequently advised to keep【C17】______active as we age, but older people need to keep mentally active as well. Those who【C18】______are more【C19】______to maintain their intellectual abilities and to be generally happier and better adjusted. And intellectual activity actually【C20】______brain-cell health and size.
【C12】
选项 A、number
B、numbers
C、amount
D、amounts
答案D
解析 词组辨析题。四个词都表示数量大。amounts of和an amount of后接不可数名词；numbers of和a number of后接可数名词的复数形式。由此可见amount和number在使用单数形式时都应在前面加不定冠词。
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