The teacher asked the students __________ her _______ the word again.

A．listen to; to read

B．to hear; say

C．to listen to; speak

D．to listen to; pronounce

硬膜外术后止痛可分为以下几种给药方法()

A．连续硬膜外注药

B．病人自控硬膜外腔给药

C．给泵程序化自动分次给药

D．间断分次硬膜外腔给药

E．自动连续给药加病人自控间断给药