耵聍栓塞的形成原因不包括（）
A.外耳道狭窄
B.老人下颌运动无力
C.外耳道炎、尘土等刺激
D.外耳道异物
E.先天性耳前瘘管
参考答案：E
乙型肝炎的病原体是（）
A.PV
B.HCV
C.HAV
D.HIV
E.HBV
Did you ask whose computer ______________ ?
A．that blue one was
B．is that blue one
C．it was that blue one
D．that blue one is
