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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 level of intelligence unless he has opportunities to learn. So the second factor is what happens to the individual-the sort of environment in which he is brought up. If an individual is handicapped(不利的)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 history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at tirth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster(抚养)homes. Peter was raised by parents of low intelligence in an isolated community with fewer educational opportunities. Mark was reared in the home of well-to do parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark’s I. Q. was 125, twenty-five points higher than the average and forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.
The case history of the twins appears to support the conclusion that______.
选项 A、individuals with identical brains are seldom tested
B、an individual’s intelligence is determined only by his environment
C、lack of educational opportunities blocks the growth of intelligence
D、changes of environment produce changes in the structure of the brain
答案C
解析 第二段举例说明环境也就是教育对智力发展的影响。
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