Mrs Brown gave us several cases       language travel students were likely to get enough language practice .

A．where

B．which

C．as

D．what

鼻咽癌的好发部位为（）。

A.咽鼓管圆枕

B.鼻咽顶壁

C.梨骨后缘

D.咽隐窝

E.以上都不是