Nowadays with the development of economy more and more people have their own private cars. It is really convenient and can make it easy for us to go travelling to any place . So more and more cars are coming and going in the street .So many cars will surely cause many traffic jams and accidents. The gas from the cars will also cause environment pollution. So we should try to go travilling by bike instead of by car.
把问题回答一遍j就差不多了，注意时态
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