The case history of the twins appears to support the conclusion that ______.

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A. individuals with identical brains seldom test at the same level

B. an individual's intelligence is determined solely by his environment

C. children reared under average conditions possess average intelligence

D. lack of opportunity hinders the growth of intelligence

参考答案:

D答案为D。根据最后一句，Given equal opportunities，the twins，having identical brains， would have tested at roughly the same level作出该项选择。