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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.
Which of the following can sum up the main idea of the passage?
选项 A、Environment is important in determining a person’s intelligence.
B、Human brains differ considerably.
C、The brain a person is born with is important in determining his intelligence.
D、Persons having identical brains will have roughly the same intelligence.
答案A
解析 主旨大意题。本题问下列哪一项能够归纳本文的中心思想。依据同上第7l题，直接选A，因为选项A的意思与第71题的答案一致。
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