Nowadays,ridingabiketoschoolhasbeenachoiceoftransportationforstudents.Therearemanyadvantagestoridingabicycle. 　　Firstofall,environmentalprotectionissuchanurgentissuethateveryoneofusshouldbecarefulwithwhatwedo.Ridingtoschoolmaynotchangethewholesituation,butitdoescontributetoreducetheairpollutionandsavetheresourcesasmuchaswecan. 　　Secondly,ridingabikeisalsoagoodexerciseforustostrengthenourselves.Ifyougotoworkbyridingabicycleinsteadofdrivingortakingabus,youcanhaveabetterchanceofgettingenoughexerciseyouneedeveryday.What'smore,ridingabikesavesusalotoftimeandmoneythangoingtoschoolonfootorbybus. 　　However,bicycleridinghasitsdisadvatages.Whenyourideabiketoschool,youneedobeythetrafficrulesevenifyouareinahurry.Safetymustcomefirst!