At first, I didn’t know what ____ Facebook was, and now I do know what it is. I have to say, it sounds like ____  huge waste of time.

A．/; the

B．/; a

C．the; a

D．a; the

患者男性，60岁，有肺气肿史。高热咳嗽1周伴气急发绀，痰为脓性带血，呈胶冻状。最可能诊断是

A．支原体肺炎

B．浸润型肺结核

C．肺炎球菌肺炎

D．肺炎杆菌肺炎

E．军团菌肺炎