in shanghai, there're mainly four means of transportation,the underground, taxis, buses and electric *kes. the underground is much faster than taxis and buses. buses are the cheapest but the slowest of the four. taxis run * quickly than buses, but they are * expensive. now, * and * people choose to use electric *kes. the electric *ke is both clean and mo*le. it also saves money. it is the most convenient means of transportation. __