Withtheimprovementofourlivingstandard,moreandmorepeoplecanaffordacar.Asaresult,ourroadsaremoreoftenthannotcrammedwithcars.However,withmoreandmorewastegasbeingdischargedbythecars,theproblemofairpollutionbecomesevenmoreserious.Sonowadaysweadvocatetoleadalow-carbonlife. Mysuggestionisweshouldridebikesmoreofteninsteadofdrivingcars.Byridingabike,wecannotonlyexerciseourbodybutalsoprotectoure...[继续阅读]