选词填空10分

People go to work in    小题1:   ways. Some people go to work on      小题2:    because they live           小题3:         their work places. Some people go to work by bike      小题4:      they live farther away, or they like     小题5:       bikes. They think it is    小题6:      for their health. Today more people have private(私人的)cars,so they can go to work by     小题7:         . In the south of China, many people even go to work bv         小题8:         because water is around their      小题9:     Will people go to work by plane? I     小题10:         so, if necessary. 

顺序法的前提是要事先掌握各种产品的边际贡献和销售收入计划数。