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【单选题】
格塞尔的 “双生子爬楼梯试验”充分说明了( )。A.
遗传素质的生理成熟程度制约人的身心发展的过程和阶段
B.
遗传素质的差异性决定人的身心发展个性
C.
遗传素质可随环境的改变而改变
D.
遗传素质提供了人的身心发展的可能性
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