小儿急性肠梗阻最常见的原因是（）
A.嵌顿疝
B.肠套叠
C.肠扭转
D.粘连性
E.蛔虫性
参考答案：B
简述表演型(癔症性)人格障碍的临床特点。
The building _____ Rome times has been rebuilt recently.
A．dates back to
B．date from
C．dating back to
D．dated from
