— What's the matter?

— She caught _____ bad cold and had to stay in _____ bed.[ ]

A. the; the

B. a; the

C. a; a

D. a; 不填

下列哪种疾病痰量多时可出现分层现象（）。

A.支气管扩张

B.慢性支气管炎

C.慢性咽炎

D.肺癌

E.肺结核