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北京师范大学2013年3月考博英语真题PartI:ListeningComprehension略PartII:ReadingComprehensionDirections:Therearesixpassagesinthispart.Eachofthepassagesisfollowedbyfivequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.ChoosethebestoneandmarkyouranswerontheANSERSHEET.PassageOneIn1900theUnitedStateshadonlythreecitieswithmorethanamillionresidents-NewYork,Chicago,andPhiladelphia.By1930,ithadtengiantmetropolises.Theneweronesexperiencedremarkablegrowth,whichreflectedbasicchangesintheeconomy.LineThepopulationofLosAngeles(114,000in1900)rosespectacularlyintheearlydecadesofthetwentiethcentury,increasingadramatic1,400percentfrom1900to1930.AnumberofcircumstancescontributedtothemeteoricriseofLosAngeles.Theagriculturalpotentialoftheareawasenormousifwaterforirrigationcouldbefound,andthecityfoundershadthevisionanddatingtoobtainitbyconstructinga225-mileaqueduct,completedin1913,totapthewateroftheOwensRiver.Thecityhadasuperbnaturalharbor,aswellasexcellentrailconnections.Theclimatemadeitpossibletoshootmotionpicturesyear-round;henceHollywood.Hollywoodnotonlysuppliedjobs;itdisseminatedanimageofthegoodlifeinSouthernCaliforniaonscreensallacrossthenation.ThemostimportantsingleindustrypoweringthegrowthofLosAngeles,however,wasdirectlylinkedtotheautomobile.ThedemandforpetroleumtofuelgasolineenginesledtotheopeningoftheSouthernCaliforniaoilfields,andmadeLosAngelesNorthAmerica'sgreatestrefiningcenter.LosAngeleswasaproductoftheautoageinanothersenseaswell:itsdistinctivespatialorganizationdependedonwidespreadprivateownershipofautomobiles.LosAngeleswasadecentralizedmetropolis,sprawlingacrossthedesertlandscapeoveranareaof400squaremiles.Itwasacitywithoutarealcenter.Thedowntownbusinessdistrictdidnotgrowapacewiththecityasawhole,andtherapidtransitsystemdesignedtolinkthecenterwithoutlyingareaswitheredawayfromdisuse.Approximately800,000carswereregisteredinLosAngelesCountyin1930,oneper2.7residents.SomevisitorsfromtheeastcoastweredismayedattheendlessurbansprawlanddismissedLosAngelesasamerecollectionofsuburbsinsearchofacity.Butthefreedomandmobilityofacitybuiltonwheelsattractedfloodsofmigrantstothecity.21.Whatisthepassagemainlyabout?A.ThegrowthofcitiesintheUnitedStatesintheearly1900'sB.ThedevelopmentoftheSouthernCaliforniaoilfieldsC.FactorscontributingtothegrowthofLosAngelesD.IndustryandcityplanninginLosAngeles22.TheauthorcharacterizesthegrowthofnewlargecitiesintheUnitedStatesafter1900asresultingprimarilyfromA.neweconomicconditionsB.imagesofcitiesshowninmoviesC.newagriculturaltechniquesD.alargemigrantpopulation23.Thewordmeteoricinline6isclosestinmeaningtoA.rapidB.famousC.controversialD.methodical24.Accordingtothepassage,themostimportantfactorinthedevelopmentofagriculturearoundLosAngeleswastheA.influxofnewresidentstoagriculturalareasnearthecityB.constructionofanaqueductC.expansionoftransportationfacilitiesD.developmentofnewconnectionstothecity'snaturalharbor25.ThevisitorsfromtheeastcoastmentionedinthepassagethoughtthatLosAngelesA.wasnotaccuratelyportrayedbyHollywoodimagesB.lackedgoodsuburbanareasinwhichtoliveC.hadanexcessivelylargepopulationD.wasnotreallyasinglecityPassageTwoImagineeatingeverythingdeliciousyouwantwithnoneofthefat.Thatwouldbegreat,wouldn'tit?New“fakefat”productsappearedonstoreshelvesintheUnitedStatesrecently,butnoteveryoneishappyaboutit.Makersoftheproducts,whichcontainacompoundcalledolestra,sayfoodmanufacturerscannoweliminatefatfromcertainfoods,Critics,however,saythatthenewcompoundcanrobthebodyofessentialvitaminsandnutrientsandcanalsocauseunpleasantsideeffectsinsomepeople.Soitisuptoconsumerstodecidewhetherthenewfat-freeproductstastegoodenoughtokeepeating.Chemistsdiscoveredolestrainthelate1960s,whentheyweresearchingforafatthatcouldbedigestedbyinfantsmoreeasily.Insteadoffindingthedesiredfat,theresearcherscreatedafatthatcan’tbedigestedatall.Normally,specialchemicalsintheintestines“grab”moleculesofregularfatandbreakthemdownsotheycanbeusedbythebody.Amoleculeofregularfatismadeupofthreemoleculesofsubstancescalledfattyacids.ThefattyacidsareabsorbedbytheintestinesandbringwiththemtheessentialvitaminsA,D,EandK.Whenfatmoleculesarepresentintheintestineswithanyofthosevitamins,thevitaminsattachtothemoleculesandarecarriedintothebloodstream.Olestra,whichismadefromsixtoeightmoleculesoffattyacids,istoolargefortheintestinestoabsorb.Itjustslidesthroughtheintestineswithoutbeingbrokendown.Manufacturerssayit’sthatabilitytoslideunchangedthroughtheintestinesthatmakesolestrasovaluableasafatsubstitute.Itprovidesconsumerswiththetasteofregularfatwithoutanybadeffectsonthebody.ButcriticssayolestracanpreventvitaminsA,D,E,andKfrombeingabsorbed.Itcanalsopreventtheabsorptionofcarotenoids,compoundsthatmayreducetheriskofcancer,heartdisease,etc.ManufacturersareaddingvitaminsA,D,EandKaswellascarotenoidstotheirproductsnow.Evenso,somenutritionistsarestillconcernedthatpeoplemighteatunlimitedamountsoffoodmadewiththefatsubstitutewithoutworryingabouthowmanycaloriestheyareconsuming.26.Welearnfromthepassagethatolestraisasubstancethat____________________.A.containsplentyofnu