多项选择题
What are the stages of language development in vygowski’s theory.（）
A.SocialB.EgocentricC.Pre-operation stageD.Inner
单项选择题 The following concepts do not belong to Piaget’s Theory（）.
判断题 Chomsky has argued that all languages have the same underlying，abstract structure-universal grammar.（）
多项选择题 Language structures include（）
