第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 Where does the talk take place

A．Throw the cigarette end (烟头) on the floor.
B．Try to blow off the ash.
C．Keep the cigarette end burning.
D．Use an ash receiver and put out the cigarette completely.

A．they are having public meetings
B．in buses or ball-rooms
C．invited by the hostess near the end of the meal to do so
D．they walk on the street