学术综合英语听力材料

外语下载中心目录Unit1PresentingaSpeech.......................................................................................................1RoadBuilding................................................................................................................................1TheMississippiRiverinAmerica..................................................................................................1Unit2EnergyConservation......................................................................................................2AnEyewitnesstoChangesinChina..............................................................................................2Talkwith“HarryPotter”–DanielRadcliffeAnswersQuestionsformFans.................................4Unit3Traffic..................................................................................................................................5DrivingWhileonaCellPhoneWorseThanDrivingWhileDrunk..............................................5QuakeKillsatLeast300onIndonesianIsland..............................................................................6Unit4SocialBehavior................................................................................................................7TheMen’sMovement:WhatDoesItMeantoBeaMan?............................................................7HusbandsandWives:aCallerformNorthbridge..........................................................................8Unit5Population.........................................................................................................................9SuicideonCampus.........................................................................................................................9Chinavs.India.............................................................................................................................11Unit6ACityinChina..............................................................................................................12WhatDoestheFutureHoldforMarriage?...................................................................................12ShouldTeacherHavethePowertoSearchforKnives?..............................................................12Unit7DishonoringtheHonorSystem................................................................................13OpeningSpeechfortheUK’sFirstDisabledPeople’sParliament..............................................13OpeningSpeechfortheSydney2000OlympicGames...............................................................14Unit8PEIEnergyFramework...............................................................................................15NuclearPowerPlants...................................................................................................................15ShouldThereBeMoreNuclearPowerPlantsintheUS?............................................................15ComprehensiveAcademicEnglishForGraduates1Unit1PresentingaSpeechRoadBuildingGoodmorning,everyone.TodayI'llbetalkingabouttherelationshipbetweenroadbuildingandthedevelopmentoftheAmericaneconomyduringthe18thcentury.About300yearsago,theUnitedStates'economywasgrowingrapidly,mainlybecauseofaboomingtradeintwoimportantagriculturalproducts:grainandcotton.GrainoutputintheeasternpartofAmericaincreasedquicklyatthattimeduetotherapidlygrowingpopulationandthelargenumberofimmigrantsfromEurope.Asaresult,thedemandforgrainalmostdoubled.Forthisreason,thetradeingrainfirstdevelopedinthispartofthecountry.Atthesametime,theroadsystemwasgraduallybuiltupinordertotransportthegrainfromtheruralareastovariouscities.Theroadbuildingclearlyhelpeddeveloptheeconomyquicklyintheseareasandinthecitiesaswell.Duringthesameperiod,farmersintheSouthcouldgetalargeamountoflaborersfromAfrica,andtheystartedtogrowcotton.Asthecottonoutputincreased,thefarmersneededtosellitinotherplaces.Asaresult,manyroadswerebuilttolinktheruralareastothecities.Atfirst,thistradeofgrainandcottontookplacealongthecoast,ornearriversandlakes.Ittookplacetherebecauseitwaseasyandcheaptotransportgoodsfromoneplacetoanother.Before1700,itwasveryexpensivetomovethegoodsbyroad.So,farmershadtorelymainlyonriverstomovetheircropstomarkets.Atthattime,therewasonlyonecontinuousroadthatexistedintheUS.Itranfromnorthtosouthalongcountryroads,whichwerelinkedtogethertomakeonelongroad.Withinashorttime,thefirsteast-to-westroadswerebuilt.Theywerecalledturnpikes.Privatecompaniesbuilttheseroadsandcollectedfeesfromallvehiclesthattraveledonthem.Eventually,becauseoftheboomingtradeofgrainandcotton,anetworkofroadwayswascompletedthatconnectedsomemajorcitiesandtowns.Althoughtravelingwasstillcostlyforfarmers,theysoonpreferredtomovetheircropstocitiesandotherareasonroadwaysratherthanbyboatbecauseitwasfasterandmoreconvenient.SoherewecanseearatherclearpictureofroadbuildingintheUnitedStatesanditsimpactoneconomicdevelopmentduringthatperiod.TheMississippiRi