普鲁卡因不可用于哪一种局麻
A．硬膜外麻醉
B．表面麻醉
C．蛛网膜下腔麻醉
D．传导麻醉
E．浸润麻醉
参考答案：B
Don’t bother me．I am listening to the birds ______．
A．singing
B．sing
C．to sing
D．sung
"Please" and "Thank you" are words which are very helpful when greeting other people, and
buying____ or____.[ ]
A. good; service
B. goods; services
C. good; services
D. goods; services
