Questions 11 to 18 are based on the conversation you have just heard.

A．The woman’s boss didn’t know she was late for work.

B．The woman’s boss asked why she wasn’t there on time.

C．Tile woman’s boss doesn’t have a habit of being on time.

D．The woman’s boss wants her to keep a habit of being punctual.

引起毛细支气管炎最常见的病原是（）

A.病毒

B.细菌

C.支原体

D.衣原体

E.真菌