题目内容:
Thecasehistoryofthetwinsappearstosupporttheconclusionthat__________ A.individualswithidenticalbrainsseldomtestatthesamelevel
B.anindividual'sintelligenceisdeterminedonlybyhisenvironment
C.lackofopportunityblocksthegrowthofintelligence
D.changesofenvironmentproducechangesinthestructureofthebrain
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答案解析: