选 修 6  Unit 1
课前1
概括大意Like every big city，New York has its own traffic system.Traffic jams can be terrible.It’s usually quickest to go by subway.The New York subway is easy to use and quite cheap.The subway goes to almost every corner of Manhattan.But it is not safe to take the subway late at night because in some places you could get robbed.New York buses are also easy to use.You see more if you go by bus.There are more than 30,000 taxis in New York.They are easy to see，because they are bright ...