Bike is a popular means of transportation .It is a friendly environment transport tool.I like riding bikes when go travelling or go shopping.Nowdays motor cars are increasingly popular but I think it will cause a lot of damage to us .First it will give out lots of waste gas,which will contribute to the global warming.It is bad for our earth.Second. the number of the cars is becoming larger and larger and the crowded traffic will certainly bring about the risk of safety.So I think riding a bike is a better choice if we take environment into consideration
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