下列哪项可致长期慢性咳嗽
A．急性咽喉炎
B．支气管异物
C．支气管扩张
D．百日咳
E．气管肿瘤
参考答案：C
—________
—He's old with white hair. [ ]
A. What is he?
B. Who is he?
C. What do he look like?
D. What does he look like?
电动三通挡板故障的原因？
