Which is the right order of the Bottom-up model ？

A.Introducing new vocabulary and new structures， going over the text， followed by some questions and answers and reading aloud practice.

B.Going over the text， introducing new vocabulary and new structures， followed by some questions and answers and reading aloud practice.

C.Going over the text， followed by some questions and answers and reading aloud practice， introducing new vocabulary and new structures.

D.Introducing new vocabulary and new structures， followed by some questions and answers and reading aloud practice， going over the text.

正确答案：Introducing new vocabulary and new structures， going over the text， followed by some questions and answers and reading aloud practice.