目前认为先天性心脏病主要病因是()
A．胎盘早剥
B．宫内细菌感染
C．宫内立克次体感染
D．母亲妊娠毒血症
E．宫内病毒感染
参考答案：E
(2013·黑龙江双鸭一中月考)It was several years ________ I realized ________ David had lied to me.
A．when; that
B．that; when
C．before; that
D．until; why
"硬化萎缩注射法"和"消痔灵注射法"，其适应证是：（）
A.外痔
B.内痔伴有肛门周围急慢性炎症
C.因腹腔肿瘤引起的内痔
D.Ⅰ、Ⅱ、Ⅲ期内痔
E.混合痔
