常用于抗喘的M受体阻断剂是（）
A.沙丁胺醇
B.后马托品
C.异丙托溴铵
D.丙胺太林
E.山莨菪碱
参考答案：C
-Ken,_______________,but your TV is going too loud.
- Oh,l'm sorry. I'Il turn lldown right now. [ ]
A. I'd like to talk with you
B. I'm really tired of this
C．I hate to say this
D.I need your help
. If law and order _____, neither the citizen nor his family is safe.
A．are not preserved
B．is not preserved
C．were not preserved
D．have not been preserved
