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Automobilescooyu.netAutomobiles,asaproductofmoderncivilization,havebeenplayingavitalpartinthedailyactivitiesofhumansociety.Industryneedsautomobilesforfarmingaswellastransportation.Everyday,automobilesdrivepeopletoandfromwork.Onweekendsautomobilestakefamiliesforjoyfuloutings.Andduringholidayseasons,automobilesfillthehighwayseverywhere,eveninremoteareas.Itcouldbesaidthatthewheelsofautomobilesmovesocietyforward.Butautomobileshavealsogivenrisetoaseriesofproblems.Forexample,citiesareovercrowdedwithautomobiles.Theycreatealotofnoiseandtrafficaccidentswhichdisable（伤残）orkillmanypeopleeachyear.Worstofallperhapsistheairpollutioncausedbytheexhaustgasesproducedbyautomobiles.Someofthegasesarehighlytoxic(有毒的）andaserioushealthhazard.