There are two factors which determine an individual’s intelligence. The firs

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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. [br] 【C3】

选项 A、refers
B、applies
C、happens
D、concerns

答案 C

解析本题需一个后面能接介词to的动词，D项concerns意为“涉及，影响”，它是及物动词，因此可首先排除。refer to意为“提及，谈到”；apply to意为“适用于”；happen to意为“发生于”。从句意看，应选C项。句意为：第二个因素就是对人产生影响的东西——即他们成长的那个环境。

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