胸腔感染的常见途径有（）

A.肺部病灶破溃直接感染胸腔

B.膈下脓肿，致病菌经淋巴循环或直接破溃感染胸腔

C.全身化脓性感染，致病菌经血液循环达胸膜造成脓胸

D.胸部损伤清创不彻底，使胸腔感染

E.血胸继发感染

—The shop is ______ on Saturday and Monday.

—I see.I’ll come here to buy a pen on Monday then.

A．open

B．close

C．opened

D．closed