单选题:儿童处于感知运动阶段的主要特征是(  )。

题目内容:
儿童处于感知运动阶段的主要特征是(  )。 A.只限于对当前直接感知的环境施以动作
B.能够运用语言符号代表他们经历的事物
C.获得了守恒概念
D.思维具有可逆性

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