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] 【C2】

选项 A、But
B、For
C、Still
D、And

答案 A

解析从上下文的意义来看，这里需要填入一个表示转折关系的词，从句子结构看，需要一个连接词来连接两个句子，四个选项中，B项引导表示原因的句子；C项作连词时，表示“还是”，引导的从句要放在主句后；D项表示并列或对称的关系，用来连接词、短语或句子，但不表示转折。因此，But用在这里最为合适。

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