右冠状动脉供应下列结构的血液，但应除外（）
A、室间隔前上2/3
B、房室结
C、右心房
D、窦房结
E、右心室
参考答案：A
We____here two hours ago . So we___ _here for two hours .
A．have arrived , have been
B．have come , have been
C．came , have come
D．arrived , have been
道格拉斯窝是指（）
A.膀胱与直肠腹膜陷凹
B.子宫与膀胱腹膜陷凹
C.直肠与子宫腹膜陷凹
D.骶骨与直肠腹膜陷凹
E.直肠旁腹膜陷凹
