该病的主要病因是
A．病毒感染
B．细菌感染
C．羊水吸入
D．缺乏肺泡表面活性物质
E．先天性结核感染
参考答案：D
Personally I think it is the sales manager, rather than the sales girls, ____ to blame. [ ]
A. is
B. that is
C. are
D. who are
国务院共召开了几次民族团结进步表彰大会，分别是哪几年，共表彰了多少个模范集体和模范个人？
