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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【B1】______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 be has【B2】______to learn. So the second factor is what【B3】______to the individual--the sort of environment in which he is reared. If an individual is hindered environmentally, it is【B4】______that his brain will fail to develop and he will never【B5】______the level of intelligence of which he is capable.
    The【B6】______of environment in determining an individual’s intelligence can be【B7】______by the case of the history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at birth, and their growth【B8】______were the same. When the twins were three months old, their parents died, and they were placed in separate foster(收养的)homes.【B9】______.Mark was reared in the home of wealthy parents
    who had been to college.【B10】______.This environmental difference continued until the twins were teenagers, when they were given tests to measure their intelligence. Mark’s I.Q. was 125,【B11】______.
【B3】
选项
答案happens
解析 此空所在的表语从句缺少谓语动词，且能和to搭配，happen to“发生在……身上”。what作主语，所以谓语动词要用第三人称单数形式，词尾要加s。
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