In China,more and more people like riding bikes.Riding bikes becomes a most popular way,because it is good for people.it can help people save money and energy.it is a low cost transportation.and you do not need to worry where you ”park“ the bike.maybe at a corner,it does not need much space.they just need less space than cars do.it can also avoid air pollution. it is very healthy for people,too.because people can exersice by this way.i suggest we ride bikes as possible as we can.it is not only good for environment ,but also keeping health.