It is indicated in par.3 that parents tend to  

Câu hỏi:  It is indicated in par.3 that parents tend to  

A Speak in basically the same way to a one-year-old and a three-year-old

B Use language that is far above the language level of a child

C Speak in a progressively less complex way as a child matures

D Modify their speech according to the language development of a child