完形填空：先读通下面的短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中，选出最佳选项。（共10小题，每小题0.5分，满分5分） In Nanjing, there are manygoing around the city, and they cost(花费) only 1 or 2 yuan to take a bus. So many people likea bus to school or to work. But when an old man gets on the bus, do you oftenyour seat to him? Some people on the bus don't like to help the old people. They just close their, listening to music without（没有） looking at the old people. Some turn their faces to look _ the windows. When the bus driver keeps（一直）asking them to help the old people, they don't listen to him. However, we shouldeach otherwe may need others’ help one day. Next time, please try to help others on the bus. You can let the old people get on the bus _ you, you can give your seat to an old man or you can also give your seat to a womana child. Then all the people will have alife.