Unit9Lesson35CleanMachinesWhatismostimportant,ifyouliveinabigmoderncity?Manywouldanswerthecar.Youwillfinditdifficulttogotoworkormovewithoutacar.Moreandmorefamilieshavetheirowncarsinordertomakelifemoreconvenient,buthaveyoueverthoughtaboutwhatwouldhappentothecity?Testyourknowledgeaboutcars.Areyouinterestedincars?Ifso,howmanydifferenttypesofcarshaveyouseenoryouknowabout?Talkaboutcarsinyourgroup.Talkaboutthecaryouknowbestinyourgroup.ThefollowingquestionsandthekeywordsinExercise2areforyourreference.Haveyougotanyideatoimproveacar?Speakitoutandshareitwithyourfriends.Lookatthefollowingpicture.What’sit?大家有疑问的，可以询问和交流Whatdoyouthinkofthesolarracingcar?Wouldyouliketohaveatrytodesignoneofyourown?Improveyourformerdesign.Describeyourdesignofanewcartoyourfriendsandlistentotheirsuggestions.Ifyouarereallyinterestedinsolarcarracing,readmoreaboutsolarcarracing.SolarvehiclesrepresentingfivecollegeteamsleftCalState-SacramentoonTuesdaymorningatthestartofasix-day,670-mileracetoLosAngeles.TheyreachedStanfordviaVallejo,theSanFrancisco-OaklandBayBridge,afoggySanFranciscoandHighway280.Solarcarraceswereledacrossthefirst-dayfinishlinebytheWesternWashingtonUniversity'sVikingXX,asleekcarunderaslantedarrayofsolarcellslikearoofofshinybluetile.TheViking,whichreachedStanfordwithanelapseddrivingtimeof4hours,27minutes,placedfifthinternationallyintheWorldSolarChallengeinAustralialastNovember.Thecarsarepoweredbythesun,buttheraceitselfispoweredbytheorganizationanddedicationofcollegestudents.ItstartedwiththeStanfordSolarCarProject,aloosecollectionof40orsostudentswhohavesofarbuilttwosolarcarswithalittlefacultyadviceandalotofhardwork.GraduatestudentDaveCaditzspearheadedtheideaofaracethatwouldzig-zagacrossCaliforniaandinspirethepublic'sinterestinalternative-poweredvehicles.TheAmericanSolarChallengeIn2005therewillbeaspecialeditionofASC,the2005NorthAmericanSolarChallenge.TeamswillcompeteinasolarvehicleraycefromUnitedStatesthroughCanada!HowtoDesignaSolarCarDriveTrainNowyouhaveasolarracingcar!