慢性支气管炎最常见的并发症是（）。
A.肺炎
B.肺癌
C.阻塞性肺气肿
D.肺间质纤维化
E.支气管扩张
参考答案：C
The two brothers didn’t quite get along well _______the past, but now they are like peas and carrots.
A．with
B．in
C．on
D．since
当电池液面减少时，应加（）不加稀硫酸。
