The room is too small for us _____. [ ]
A. to live in
B. living
C. live in
D. to live
答案:A
对中枢具有兴奋作用的平喘药物有()
A.沙丁胺醇
B.特布他林
C.麻黄碱
D.福莫特罗
E.氨茶碱