同子宫脱垂关系密切相关的因素（）。
A.压力性尿失禁
B.陈旧性会阴裂伤
C.子宫颈延长
D.宫颈糜烂合并溃疡
E.月经失调
参考答案：A, B, C
Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.
A．has studied; has communicated
B．had studied; communicated
C．studied; had communicated
D．studied; communicated
心搏骤停最常见的原因为（）
A.心房颤动
B.心动过速
C.心室颤动
D.肺炎
E.心衰
