The ______ way is based on the premise that the teacher should be silent as much as possible in the classroom and the learner should be encouraged to produce as much language as possible.

食管癌分型不包括（）。

A．髓质型 

B．缩窄、硬化型 

C．蕈伞形 

D．溃疡型 

E．梗阻型