Unit4Publictransport【美文阅读】Whoinventedthetrafficsignal?1868年12月10日，由英国机械师德·哈特设计的一盏红、绿两色的煤气交通信号灯是城市街道的第一盏信号灯。它的出现使城市交通大为改善，也为后来交通信号灯的完善奠定了基础。Trafficlightshadbeeninuseevenbeforecarswereinvented.Inthosedays，peopleusedhorses，wagons(四轮马车)andothermeansoftransport.Butthetrafficwasstillhorrible.Soin1868inLondon,England,trafficpolicemencameupwithabasicdevice:Alanternwithtwolights－redandgreen.Greenstoodfor“caution”andredfor“stop”．Apolicemanwouldturnthelightsregularlywithalever(控制杆).Unfortunatelythisearlytrafficlightprovedunsafe.Onemodelexplodedayearlaterandhurttheoperator.Thingsmadeaturnfortheworsewhencarswereinvented.Somepeoplewereusingnewcars，andotherswerestillridinghorses,wagonsorbicycles.Theyallsharedthesameroadsandstreetswithpedestrians(行人).Alotofaccidentstookplaceasaresult.AtrafficpoliceofficernamedWilliamL.Potts.fromDetroit,Michiganknewsomethinghadtobedone.Hedesignedatrafficsignaldevicethatcouldservefour－waystreets.Heusedthreecolors—red,yellowandgreen.Heputthesignalstogetherwithelectriccontrolsandwires.In1920,hehaditinstalledontheMichiganAvenue－Woodwardcornerstreet.Therewerethefirstautomatictrafficsignals.Detroitpolicewentontoaddfourteenmoreoftheseintwelvemonths.【诱思导学】1．Whatdidthetwocolors—greenandredstandforinthelanterndevicecameupwiththeLondontrafficpolice?________________________________________________________________________2．Whydidalotofaccidentstakeplacewhencarswereinventedattheverybeginning?________________________________________________________________________3．WhenwasthesignaldevicedesignedbyWilliamL．Pottsfirstputintopractice?________________________________________________________________________【答案】1.Greenstoodfor“caution”andredfor“stop”．2．Becausethepeoplewhowereusingnewcars，ridinghorses，wagonsorbicyclessharedthesameroadsandstreetswithpedestrians(行人)．3.In1920.PeriodⅠPreviewing(教师用书独具)●教学目标本课时主要是通过学生对学案所给出的内容的学习，了解本课文中所出现的词汇，初步了解课文以及相关的背景知识，对下一堂课就课文的全面理解起到一个铺垫作用。●教学地位本单元的话题是“Publictransport”，而本单元的第一篇文章“Thefirstundergroundintheworld”让学生了解地铁的发展历史以及发展背景，认识到地铁在交通发展史中的重要地位。(教师用书独具)●新课导入建议利用精美的图片展示北京地铁的有关情况，让学生初步了解有关早期的地铁相关知识，认识到地铁在我们日常生活中的作用和意义。●教学流程设计师生共同讨论并统一答案。Ⅰ.篇章结构Title：ThefirstundergroundintheworldCauseThevehiclesontheroadthat1.________peopletoandaroundthecitycentrecaused2.________trafficjams，whichledtothedevelopmentoftheundergroundsystem.Development·In1854，anundergroundrailwaywasdecidedtobebuiltbetweenPaddingtonandFarringdon.·In1863，thefirstinitial3.________wereopened，whichwerejustbeneaththesurfaceoftheground.·In1868，thenext4.________oftheundergroundsystemwasopenedinthesouthofLondon.·In1884，theMetropolitanRailwayCompanyandtheMetropolitanDistrictRailway5.________upandprovidedundergroundserviceinthemiddleofthecity.·In1890，Railwayopenedthefirstelectricundergroundrailway.Overthenexttwenty－fiveyears，six6.________deepundergroundlineswereconstructed.·Between1918and1938，manynewstationswereconstructed.·DuringWorldWarⅡ，theundergroundsystemhadsomeunusualuses....
