Withtheimprovementofourlivingstandard,moreandmorepeoplecanaffordacar.Asaresult,ourroadsaremoreoftenthannotcrammedwithcars.However,withmoreandmorewastegasbeingdischargedbythecars,theproblemofairpollutionbecomesevenmoreserious.Sonowadaysweadvocatetoleadalow-carbonlife. Mysuggestionisweshouldridebikesmoreofteninsteadofdrivingcars.Byridingabike,wecannotonlyexerciseourbodybutalsoprotectoure...[繼續(xù)閱讀]