题目

一个多边形的每个内角都等于120º，则这个多边形的边数是…………………（     ） A．5               B．6              C．7              D．8 答案：B    It is a little after eight in the morning and Jenny and Mary are in the taxi going to the airport．There is a lot of traffic at this hour, and the taxi is not moving very fast．This is rush hour．There are hundreds of automobiles moving in different directions, and there are many buses, trucks, and taxis．Also, there are a lot of people walking on the sidewalks and crossing streets．Everybody is going to work. “Rush hour” means ________. A．the time when people are running B．the time when crowds of people are traveling to or from work in a large town C．the time when everybody runs quickly D．the hour when people have to go to the same place