产后出血原因中哪项首先考虑用子宫切除的方法止血（）
A.子宫收缩乏力
B.胎盘植入
C.胎盘嵌顿
D.凝血功能障碍
E.胎盘粘连
参考答案：B
著名的“剑桥三史”是《剑桥古代史》、《剑桥中世纪史》、（）。
— _____?
— He said he was coming but he hasn't _____ yet. [ ]
A. Does he come tonight, come
B. Is he coming tonight, appeared
C. Will he come togight, presented
D. Why not come tonight, seemed
