长输管道常用清管器有（）种类型.
A.两
B.三
C.四
D.五
参考答案：D
--My parents and I will go to London for a trip tomorrow. --Really? __________.
A．I don't think so
B．Have a good time
C．That's very strange
D．You should try it
最早的外科医师称为（）
A.疾医
B.疡医
C.食医
D.兽医
E.大方脉
