_______,the headmaster rose to indicate that the conversation was ________. [ ]

A. At an end;in an end          

B. In the end;at an end  

C. In an end;at the end          

D. At an end;in the end

腺病毒肺炎最易出现的并发症是

A．脓气胸，脓胸

B．肺大泡

C．张力性气胸

D．心力衰竭

E．肺脓肿