题目内容：
已有研究表明，（ ）是学习书面言语的关键期。
A．1～2岁 B．2～3岁
C．4～5岁
D．6～7岁
参考答案：
答案解析：
多选题：已有研究表明，（ ）是学习书面言语的关键期。
- 题目分类：幼儿教育心理学
- 题目类型：多选题
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B．2～3岁
C．4～5岁
D．6～7岁
B．2～3岁
C．4～5岁
D．6～7岁
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