According to the passage, the average I. Q. is

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问题 According to the passage, the average I. Q. is
  
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 reared. The importance of environment in determining an individual’s intelligence can be demonstrated by the case history of the identical twins, Peter and Mark X. Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, they were placed in separate foster homes. Peter was roared by parents of low intelligence in an isolated community with poor educational opportunities. Mark was roared 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 brought together to measure their intelligence. 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.

选项 A、individual 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 语义理解题。从短文中的原文“The importance of environment in determining an individual’s intelligence can be demonstrated by the case history of the identical twins,...”可知,选项C为正确答案。
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