题目内容：
以守恒概念的形成为标志的认知发展阶段是（ ）。
A.感知运动阶段
B.前运算阶段
C.具体运算阶段
D.形式运算阶段
参考答案：
答案解析：
选择题：以守恒概念的形成为标志的认知发展阶段是（ ）。
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