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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 d

There are two factors which determine an individual’s intelligence．The first is the sort of brain he is born with．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 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--the sort of environment in which he is brought up．If an individual is handicapped environmentally，it is likely that his brain will fail to develop and he will never attain the level of intelligence ofwhich 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 birth，and their growth processes were the same．When the twins were three monthsold，their parents died，and they were placed in separate foster homes．Peter was raised by parentsof 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 read to as a child，sent t0 good schools，and given every opportunity to be stimulated intellectually．This environmental dif．ference continued until the twins were in their late teens，when they were given tests to measuI．e their in．
telligence．Mark’s I．Q•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 at roughly the same level．
The case 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 由最后一句"Given equal opportunities，the twins，having identical brains，would have tested at roughly the same level．”可知答案为C，即缺乏机会能阻碍智力的发展。
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