2. 外语
  3. There are two factors which determine an individual’s intelligence. The first is the sort of brain he 【B1】______. Human brains d

There are two factors which determine an individual’s intelligence. The first is the sort of brain he 【B1】______. 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 【B1】______. Human brains differ considerably, some being more capable than others. But no matter how good a brain he has【B2】______, 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. If an individual is【B3】______ 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【B4】______the case of the history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at birth, and their growth【B5】______ were the same. When the twins were three months old, their parents died, and they were placed in【B6】______foster(收养的)homes. Peter was reared by parents of low intelligence in an isolated【B7】______ with poor educational opportunities. Mark was reared in the home of wealthy parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be【B8】______ intellectually. This environmental difference continued until the twins were teenagers, when they were given tests to【B9】______ their intelligence. Mark’s I.Q. was 125, twenty-five points higher than the average and【B10】______ forty points higher than his identical brother.
【B10】
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答案fully
解析 空格所在部分是逗号前“Mark的IQ得分为125”的补语，说明这个得分比平均分高25分，比他的同胞兄弟高40分。因此空格处需填入副词，说明forty points higher的程度。fully“充分地，足足”。
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