September 22nd is world car free day, today you'd better take a bus, bike riding and so on green transportation.Nowadays, an increasing number of private cars in traffic and security of the person has caused some harm, the air will be more and more pollution, the concentration of carbon dioxide will be higher.Nowadays, more and more expensive petrol, China's oil resources are becoming scarce.So in the car free day, please use the green way of travel.
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