2. 外语
  3. There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born【C1】______. Human b

There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born【C1】______. Human b

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问题     There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born【C1】______. Human brains differ considerably, some being more capable than others.【C2】______no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn. So the second factor is what【C3】______to the individual—the sort of environment in which he is reared. If an individual is handicapped【C4】______, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is【C5】______.
    The importance of environment determining an individual’s intelligence can be【C6】______by the case history of the identical twins, Peter and John. When the twins were three months old, their parents died, and they were placed in【C7】______foster homes. Peter was reared by parents of low intelligence in an isolated community with poor educational【C8】______. John, however, was educated in the home of well-to-do parents who had been to college. This environmental【C9】______continued until the twins were in their late teens, when they were given tests to【C10】______their intelligence. John’s I. Q. was 125, twenty-five points higher than the average and fully forty points higher than his identical brother.
【C6】
选项 A、demonstrated
B、neglected
C、denied
D、ignored
答案A
解析 从下文看，彼得和约翰这对双胞胎在不同的家庭里成长，通过测试，两个的智商数相差很大，由此可以判断段首句空格中的词应是A项demonstrated，意为“证明”。B项neglected意为“忽略，疏忽”，C项denied意为“否认”，D项ignored意为“不理，忽视”，这三个选项均不符合句意。
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