— Liu Yi, do you miss your parents? I hear that you go back home once every month.

— Of course. You know this is the first time I _____ in the dormitory at school, far away from my

     hometown, Luoyang. [ ]

A. have stayed

B. stayed

C. stay

D. am staying

关于前列腺的描述下列错误的是（）

A.可分5叶

B.不成对

C.腺的上端肥大称前列腺底

D.体前面有前列腺沟

E.由腺组织和平滑肌组织构成