关于膀胱三角的描述错误的是（）

A.位于两输尿管口与 * * 内口之间

B.膀胱充盈时呈平滑状，收缩时则皱缩

C.输尿管间襞位于左、右输尿管口之间

D.黏膜与肌层紧密相连

E.是膀胱结核、肿瘤的好发部位

The students from Xinjiang enjoy staying in our school because everyone is _____ to them.[ ]

A. friendly

B. gently

C. happily

D. politely