题目内容：
根据以下材料，回答题
TrafficJams--NoEndinSight
1.Trafficcongestion(拥堵)affectspeoplethroughouttheworld.Trafficjamscausesmogindozensofcitiesacrossboththedevelopedanddevelopingworld.IntheU.S.,commuters(通勤人员)spendanaverageofafullworkingweekeachyearsittingintrafficjams,accordingtotheTexasTransportationInstitute.Whilealternativewaysofgettingaroundareavailable,mostpeoplestillchoosetheircarsbecausetheyarelookingforconvenience,comfortandprivacy.
2.Themostpromisingtechniqueforreducingcitytrafficiscalledcongestionpricing,wherebycitieschargeatolltoentercertainpartsoftownatcertaintimesofday.Intheory,ifthetollishighenough,somedriverswillcanceltheirtripsorgobybusortrain.Andinpracticeitseemstowork:Singapore,LondonandStockholmhavereducedtrafficandpollutionincitycentresthankstocongestionpricing.
3.Anotherwaytoreducerush-hourtrafficisforemployerstoimplementflextime,whichletsemployeestraveltoandfromworkatoff-peaktraffictimestoavoidtherushhour.Thosewhohavetotravelduringbusytimescandotheirpartbysharingcars.Employerscanalsoallowmorestafftotelecommute(workfromhome)soastokeepmorecarsofftheroadaltogether.
4.Someurbanplannersstillbelievethatthebestwaytoeasetrafficcongestionistobuildmoreroads,especiallyroadsthatcantakedriversaroundorovercrowdedcitystreets.Butsuchtechniquesdonotreallykeepcarsofftheroad;theyonlyaccommodatemoreofthem.
5.Other,moreforward-thinking,plannersknowthatmoreandmoredriversandcarsaretakingtotheroadseveryday,andtheyareunwillingtoencouragemoreprivateautomobileswhenpublictransportissomuchbetterbothforpeopleandtheenvironment.Forthisreason,theAmericangovernmenthasdecidedtospendsome$7billiononhelpingtoincreasecapacityonpublic-transportsystemsandupgradethemwithmoreefficienttechnologies.Butenvironmentalistscomplainthatsuchfundingistinycomparedwiththe$50billionbeingspentonroadsandbridges.
Paragraph1__________ A．Payingtogetin
B．Changingworkpractice
C．Notdoingenough
D．Asolutionwhichisnosolution
E．Closingcitycentrestotraffic
F．Aglobalproblem
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