According to the author at what age does a child probably begin to learn about sets and n

学历类 选择题, 已帮助 人

According to the author, at what age does a child probably begin to learn about sets and numbers?

A.Six months

B.Nine months

C.Fifteen months

D.Eighteen months

此题为多项选择题。请帮忙给出正确答案和分析,谢谢!

热搜:medline数据库中to字段是表示非英文文献的原文题名