可导致不均匀的气流阻力的有（）。
A.肺部感染
B.支气管痉挛
C.气管受压
D.肺结核
E.肺水肿
参考答案：B, C
The chairman asked me to ______ the report, because he didn't want to speak for too long at this
meeting. [ ]
A. cut out
B. cut away
C. cut off
D. cut down
影响天津民俗文化之形成及其特性的因素有（）、（）、社会政治与历史。
