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【单选题】
瑞士心理学家皮亚杰认为,人从出生到成人伴随认知结构的不断重构,形成几个按不变顺序相继出现的时期或阶段。当儿童凭借形象在头脑中进行“表象性思维”时,其认知发展到了( )
A.
感知运动阶段
B.
前运算阶段
C.
具体运算险段
D.
形式运算阶段
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