— Did the door-keeper let you in?

— No. ____I tried to tell him I was your relative, he just didn’t believe me.

A．Whether

B．Whatever

C．No matter

D．However

鉴别支气管扩张与先天性肺囊肿，下列哪项最有价值

A．咳嗽及咳痰的性状

B．肺部干、湿性啰音

C．痰液细菌学检查

D．血液常规检查

E．胸部CT