导管鞘的主要目的是（）

A.建立通道

B.导入导管

C.采取组织

D.抽吸容物

E.注入药物

一 How did you like Nick's performance last night?

一 To be honest, his singing didn't _____ to me much. [ ]

A. appeal

B. belong

C. refer

D. occur