Therearetwofactors

问题详情：

There are two factors ___61___(determine) an individual’s intelligence. The first is the sort of brain he is born___62___. Human brains differ considerably, some being __63___(capable) than others.  ____64___ however good a brain he has to begin with, an individual will have a low intelligence unless he has opportunities ____65___(learn). So the second factor is what happens to the individual—the sort of environment ___66___ he is brought up. If an individual is handicapped environmentally, it is __67__(like) that his brain will fail to develop and he will never attain the level of intelligence of which is capable.

    The importance of environment in determining an individual’s intelligence can ___68___(show) by the case of the twins, Peter and Mark. When the twins were three months old, ___69__ parents died, and they were placed in separate foster homes. Peter was brought up by parents of low intelligence with poor educational opportunities. Mark was educated in _70___ well-educated family. 20 years later, Mark’s I.Q. was 125, twenty-five points higher than the average and fully forty points higher than his twin brother.

【回答】

 61 determining     62 with     63 more capable    64 But       65 to learn

 66 where          67 likely    68 be shown      69 their       70 a

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