题目

There was not an empty seat anywhere in the concert hall at last Thursday’s event, ?it was an extremely cold night.A. when B. becauseC. if D. although 答案：【答案】D【解析】句意：上周四的活动中，音乐大厅里一个空座都没有，尽管那是一个寒冷的夜晚。根据前后句的逻辑关系，可知选D。4．适合|2a+5|+|2a-3|=8的整数a的值有（　　）A．4个B．5个C．7个D．9个