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  3. There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born in. Human brains d

There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born in. Human brains d

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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 in. Human brains differ considerably, some     【S1】______
being more capable than others. And no matter how good a brain he has to             【S2】______
begin with, an individual will have a low order of intelligence though he has        【S3】______
opportunities to learn. So the second factor is what happens to the individual--
the sort of environment in which he is brought about. If an individual is            【S4】______
handicapped (受阻碍) environmentally, it is likely that his brain will fail to
develop and he will ever attain the level of intelligence of which he is capable.    【S5】______
    The importance of environment on determining an individual’s intelligence        【S6】______
can be demonstrated by the case history of an identical twins, Peter and
Mark. When the twins were three months old, their parents died, and they were
placed in separate foster (寄养) homes. Peter was reared by parents of low
intelligence in an isolate community with poor educational opportunities.            【S7】______
Mark, moreover, was educated in the home of well-to-do parents who had               【S8】______
been to college. This environment difference continued until the twins were
by their late teens as young adults, when they were given tests to measure their     【S9】______
intelligence. Mark’s I.Q. was 125, 25 points high than the average, and fully        【S10】______
40 points higher than his identical brother.
【S2】
选项
答案And→But
解析 语篇逻辑错误 上文说：“人的大脑差别是相当大的，一些人比另外一些人更有能力。”下文说：“不管一个人生来智力如何好，他的智力将会衰退……”所以，上下文是明显的转折关系而不是顺连关系。
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