单项选择题 A．肠黏膜表面有假膜形成 B．肠黏膜出现大片坏死并形成大的溃疡 C．肠壁黏膜高度水肿，呈鹅卵石状，黏膜有裂隙状溃疡 D．溃疡呈环状与肠的长轴垂直克隆病A． B． C． D．

未知题型 听力原文：W：Were you caught in the rain last night?M：No，I was already safe inside the house．Q：What happened last night?(18)A．It rained for a short while.B．There was a car accident.C．There was a fire.D．It snowed heavily.

未知题型 听力原文：W：It's so chilly and we have to wait for Bill．He always conies late．M：He used to，but this evening，he won't．Q：What does the man think of Bill?(19)A．Bill is a punctual person.B．Bill will come on time tonight.C．Bill will be late as usual.D．Bill won't come at all.