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1、Some people believe that a car is more and more popular in the modem world，because it becomes increasingly important．If we drive a car instead of taking a bus to go to work or school，it will certainly save lots of time．And at weekends we tail also drive to many interesting places with our families．However, cars have caused much environmental pollution．They often sent off much waste air and make terrible noise．As we Call see，there are also many traffic accidents caused by cars．And especially with larger and larger numbers of cars，the road has become too crowed．As a result, the number of cars should be cut down to protect me environment．