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】______. Hum

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

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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,【C2】______being more capable than other.【C3】______no matter how good a brain he has to begin with, an individual will have a low order of intelligence【C4】______he has opportunities to learn. So the second factor is what【C5】______to me individual—the sort of environment in which he is brought【C6】______. If an individual is handicapped(受阻碍) 【C7】______, it is likely that his brain will【C8】______to develop and he will【C9】______attain the level of intelligence of which he is【C10】______. The importance of environment in determining an individual’s intelligence can be【C11】______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【C12】______foster(寄养)homes. Peter was reared by parents of low intelligence in an【C13】______community with poor educational【C14】______. John,【C15】______, was educated in the home of well-to-do parents who had been to college. This environmental【C16】______continued until the twins were【C17】______their late teens,【C18】______they were given tests to【C19】______their intelligence. John’s I. Q.(智商)was 125, twenty-five points higher tiian me【C20】______and fully forty points higher than his identical brother.
【C4】
选项 A、if
B、though
C、as
D、unless
答案D
解析 根据句意，应选用连词unless，意为“除非，如果不，要是不”。
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