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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 with. Human brains

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

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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 with. Human brains differ considerably, some being more capable than others. But 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 happens to the individual in the sort of environment in which he is reared (养育). If an individual is handicapped (残疾的) environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.
    The importance of environment in determining an individual’s intelligence can be demonstrated by the case in history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster (收养的) homes. Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities. Mark was reared in the home of well - to - do parents who had been to college. He was reared as a child, sent to good schools, and given every opportunity to be stimulated intelligently. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark’s IQ was 125, twenty - five points higher than the average and fully forty points higher than his identical brother; Given equal opportunities, the twins, having identical brains, would have tested roughly the same level.
The case in history of the twins appears to support the conclusion that_________.
选项 A、individuals with identical brains seldom test at the same level
B、an individual’s intelligence is determined only by his environment
C、lack of opportunity blocks the growth of intelligence
D、changes of environment produce changes in the structure of the brain
答案C
解析 推理判断题。本题问历史上的那对双胞胎的例子似乎支持什么结论。依据那对双胞胎的智力检查结果，以及他们成长环境的差别，结论不言而喻。缺少机会阻碍了智力发展，故选C．选项A。“具有双胞胎大脑的个人智力检测很少居于同一水平’’显然与文章最后一句的意思相悖。选项B．“一个人的智力仅仅是由他的环境决定的”与文章开头的第一句话的意思相悖。选项D．“环境的改变能导致大脑结构的变化”文章里根本没有提及。
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