题目内容：
在幼儿园时，小军将自己最喜欢的玩具汽车送给妈妈作为生日礼物：三年级时，他送给妈妈的生日礼物是妈妈喜欢的漂亮发夹，这一转变说明他的思维已进入（ ）
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：在幼儿园时，小军将自己最喜欢的玩具汽车送给妈妈作为生日礼物：三年级时，他送给妈妈的生日礼物是妈妈喜欢的漂亮发夹，这一转变说明他的思维已进入（ ）
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