用久了的电风扇扇叶上布满灰尘，主要是扇叶旋转与空气发生____而带电，带电体具有____的性质。

已知直线l在x轴上的截距为3，在y轴上的截距为﹣2，则l的方程为（　　）

阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。

Mike: What do you think life will be like in 100 years?
Bob:     ____ 
Mike: Great . Then we don't have to do any housework. The robots will help us. Will there be any
paper money?
Bob: NO, there won't.  ____ 
Mike: And I think we won't have to go to school for lessons.   ____   
Bob: I agree. Do you like traveling?
Mike: Of course. I live traveling. ____ 
Bob: You will see a more beautiful world in 100 years because the cities will be like gardens. ____    
Mike: Wow, I can't wait.