Bikes are very popular in Beijing,it is easy for go to school or go to work by bike.Now more and more people have bought cars,but it will make the air dirty,that is really not friendly to the environment.
However,bikes can help protect the environment,it is healthy,and,what's more,we can save energy by riding a bike instead of driving.So,I prefer a bike than a car,because bike is eco-friendly,cheap,and quite convinient when you'll park it.This is not what a car can easily do.