直肠镜及乙状结肠镜检时引起穿孔，因为（）
A.肠壁炎症
B.肠道畸形
C.术前未作清洁灌肠
D.未在直视下推进
E.肠腔有肿块
参考答案：D
— Where did you find the group of children?
— It was in the woods ______ they played hide-and-seek. [ ]
A. that
B. where
C. which
D. when
下述哪种病是动脉导管依赖性心脏病
A．矫正性大动脉转位
B．肺动脉闭锁合并室间隔完整
C．肺动脉闭锁合并室间隔缺损
D．完全性大动脉转位合并室间隔缺损
E．右室双出口合并动脉导管未闭
