阅读下文并回答问题。

Bikes and cars are two important things. Many Chinese people have cars now, but many Chinese people still like to ride bikes. Do you know why?

We all know that the bike can't go quickly, but it's easy for people to buy and ride. As for the car, it costs too much money.

Most Americans live far from the center of cities or their working places. So they need cars to go to work every day. Also, when they want to go shopping, cars are also necessary（必要的）. Most Chinese people live near their working places, so they don't need cars to go to work. And that is good for the environment(环境)if people stop driving. So there is a day called "No-Car Day" on September 22^nd every year.