干性咳嗽的常见病因是（）
A.慢性支气管炎
B.支气管扩张症
C.空洞型肺结核
D.肺脓肿
E.肺癌
参考答案：E
_____clearly so that your teacher_____you correctly.
A．Write, can understand
B．Having written, can understand
C．To write, could understand
D．Writing, will understand
奏效速度可与静脉注射相媲美的是（）。
A、栓剂
B、软膏剂
C、气雾剂
D、膜剂
