2022-2023年河南省漯河市大学英语6级大学英语六级模拟考试(含答案)

2022-2023年河南省漯河市大学英语6级大学英语六级模拟考试(含答案)学校:________班级:________姓名:________考号:________

一、2.ReadingComprehension(SkimmingandScanning)(20题)1.

ItwasyoungRichard'sgrandmotherwhowasthefirsttofindthathehadagreattalentforabsorbingknowledge.

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2.GeoffreyHealholdsthattohavecompaniesrespondingtofinancialincentivesratherthantheirownfeelingsisthe______.

3.

The4200-acreranchiskeptasonelargeandintactarcheologicalsiteduetoWilcox's______.

4.TopeoplelivingintheArctic,themeltingofsomeglaciersmaypermitnewopportunitiesfor______.

5.EMERYTOBIN:Pistol-Packin'Reformer

Ketchikanhashadmanynotablecitizensinthecity's102yearsofhistory,butperhapsnonestandsoutsoboldlyasthelateEmeryTobin,whodiedin1977atage81.HisrosterofactivitiesandaccomplishmentsinKetchikanislengthyandincrediblyvaried.HejoinedthenewlyfoundedAmericanLegionPost3in1921,becameamemberoftheChamberofCommercein1923,andwasachartermemberofKetchikanRotaryin1925.

Intheearly1920shealsowasanactiveleaderinKetchikan'sBoyScoutTroop#1,thefirsttroopinallofAlaska,antihewasavolunteerdramacoachforthehighschool'stheatricalproductions.HewaslaterafounderpluspublisherandeditoroftheAlaskaSportsmanmagazine,whichcontinuestodayasthenationallyknownAlaskaMagazine.

HismagazineofficeandhisAlaskaSpecialtiesnoveltyshopwerelocatedintheold1904YateshospitalonMissionStreet-nowtheSeamen'sCenter.

TheRainGaugethatstandsnexttotoday'svisitorbureauonthedockwasfirsterectedinfrontofTobin'sshop.HewasanavidboosteroftourismandsoldAlaskabooksandnoveltiesthroughadsinhisAlaskaSportsmanmagazine.

ButthosethingsarenotnecessarilywhatEmeryTobinisrememberedfor.Emery'sclaimtofameisthatheissaidtobethemanwhospearheadedtheclosureofthecity'sredlightdistrictsin1953,ending50yearsofopenlytoleratedprostitutioninKetchikan,Alaska!Hebecameaherotosomeandanarchvillaintoothers.ItwasduringthatcontentiouscrusadethatEmerykeptapistolathandonhisdesk.

AlthoughheservedinFranceinWorldWarⅠ,Emerywasnotamanonewouldeverconnectwithafirearm.Hewasnottall,hebadaratherhighvoiceandaBostonareaaccentheneverlost,whichmadeanRsoundlikeaW—somepeoplethoughtitwasalisp.Hespokerapidlyandwithgreatassurance.Evenafterhishairturnedwhite,hestillhadthickblackeyebrowsonabrowridgethatmadesmilesthatblossomedonhisfaceseemclosertofrowns.WhenhewalkedwithhisrapidgaitdownKetchikan'swetandbreezystreets,headbentandhandsinpockets,heappearedtobebuckingapowerfulheadwind.

EvenintohissixtiesEmerywasfearless.WhenayoungmanshopliftedsomethinganddepartedrunningfromEmery'sAlaskaSpecialtiesshoponMissionStreet,Emerytookoffafterhim,legsandarmspumping.HetackledthemiscreanttothewetsidewalkinfrontoftheentrancetoSt.John'sChurchandpinnedhimthereuntilhelparrived.SomeofEmeryTobin'sspiritanddeterminationmusthavecomedirectlyfromhisfather.

EmeryFridolfTobinwasborntoAugustandEmmaTobin,Swedishimmigrants,onDec.14,1895,inQuincy,Mass.,tenmilessouthofBoston.AugustTobinwasapaintingcontractor,workingfortheschooldistrict.ThegreatDepressionof1893hadaffectedeveryone.Tobin'scustomersownedhimmoneyandTobinowedmoneytohisowncreditors.Timeswerehard.

TwoyearsafterEmery'sbirth,in1897,newsoftheKlondikeGoldRushcircledtheglobe,andamongthoseinfectedwithgoldfeverwereAugustTobinandhisbrother-in-law-Emma'sbrother.Thetwocoupleswerecloseandhadbeenmarriedatadoublewedding.Eachlittlefamilyhadtwochildren-theeldestofthefourbabiesnotyettwoyearsold.Thetwofathersdecidedthatonewouldhavetostayandcareforbothwivesandallfourchildren;theotherwouldgotoAlaska,makeafortuneandreturninayeartoQuincy.Atleastthatwastheplan.SothemendrewstrawsandAugustdrewthelongstrawforAlaska.Emerylovedtotellthisstory.Hewouldleanbackinhissqueakyoakdeskchairandhisfacewasallsmilesasherelatedhisfamily'shistory.

Emery'slatherwaslongonconfidencebutshortonmoneytogethimselftoSeattle,muchlessallthewayto

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6.EconomizingofthePoor

ComprehendingEconomizingofthePoor

Walkingdowntheaislesofasupermarket,low-incomeshoppersmustconsideranumberoffactorsincludingquantity,price,qualityandnutritionaldifferenceswhenselectingfoodproducts.Food-purchasedecisionsbythepooroftenentailbalancesamongtaste,preferenceandqualityfactors--eitherrealorperceived--tomeetspendingconstraints.Withinbroadproductcategoriessuchascereal,cheese,meatandpoultry,andfruitsandvegetables,shopperscanchooseamongmanysubstitutableproducts.Low-incomeshopperscanextendtheirfooddollarsinanumberofways.Theymayshopindiscountfoodstores;theymaypurchaseandconsumelessfoodthanhigher-incomeshoppers;theymaypurchaselow-priced(andpossiblylowerquality)foodproducts;ortheymayrelyonsomecombinationofallthree.Abetterunderstandingofhowthepooreconomizeinfoodspendingaddressesimportantpolicyquestionsraisedbyresearchers,nutritioneducators,andfood-assistanceprogrammanagers.

TheCorrelationbetweentheLocationandPrice

Whetherthepoorfacesignificantlydifferentfoodpricesduetowheretheyshopforfoodremainsanunresolvedempiricalquestion.Extensiveresearchovertheyearshastriedtoanswerthequestion--Dothepoorpaylessforfood?TheEconomicResearchService(ERS)in1997receivedtheresultsofstudiescomparingpricedifferencesingrocerystoresacrossdifferentincomelevelsandcombinedthesewithcurrentcensusdataonthedistributionoflow-incomehouseholdsbyurbanizationtype.TheERSstudyconcludedthat,ingeneral,thepoorfacehigherpricesduetotheirgreaterrepresentationinurbanandruralareas(asopposedtosuburbanareas),wherefoodpricestendtobehigher.

HigherPricesbutLessSpending

Basedonresultsfromhouseholdsurveys,ERSalsofoundthatdespitefacinghigherprices,low-incomeshoppersspendlessthanhigher-incomeshoppersforfoodpurchasedinfoodstores.Duetotheirlevelofaggregationandlackofin-storesalesandpromotioninformation,suchsurveysshedlittlelightontheeconomizingpracticesofhouseholds.Tolearnmoreabouthowlow-incomeshoppersspendlessforfooddespitefacinghigherprices,weobtainedfood-storepurchasedatathatincorporateper-capitaquantityandexpenditure-measureequivalents(householdmeasuresadjustedforhouseholdsize)acrossincomelevels.

TheMainEconomizingPractices

Theresultingcomparisonsdescribehowindividualswithdifferentlevelsofincomevaryintheirfood-spendingpatterns.Byusingactualtransactiondata,detailedinformationabouttheproductpurchased(forexample,price,productdescription,packagesize,andbrandname)aswellastheconditionofpurchase(promotion,coupon,orsaleitem)wasobtained.Fromthese,theaverageunitcost(perounce,perpound)foreachitemwascalculated.Low-incomeshoppersmayusefourprimaryeconomizingpracticestoreducetheirfoodspending.First,theymaypurchaseagreaterproportionofdiscountedproducts.Second,theymaypurchasemoreprivate-labelproducts(genericorstorebrand)versusbrandproductsthanhigher-incomeshoppersbuy.Third,theymaytakeadvantageofvolumediscountsbypurchasinglargerpackagesizes.Fourth,theymaypurchasealess-expensivefoodproductwithinaproductclass.Althoughqualitydifferencessuchasfreshness,convenienceandtasteoftencontributetopricesdifferences,differencesinnutritionalqualityarealsoevident.

MoreSpendingonPromotionalItems

Theuseofpromotionsismeasuredbycomparingthepercentageofexpendituresandquantitiesofeachproductpurchasedonpromotion(manufacurers'coupons,storecoupons,storesales,andotherpromotions).Forrandom-weightcheese,fruit,vegetablesandmeatin1998,low-incomehouseholds(lessthan$25,000perye

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7.

Bilingualprogramscandomuchbetteriftheproblemsof______canbesolved.

8.

PeopleinEuropehavehadmoreadvancedtechnologyinusingwindpowerthanAmericans.

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9.

Vegetableoils,nutsandseedsarerichinsaturatedfat.

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10.SixWaystoAlterYourDreams

It'srarethatIhaveanexcitingorfundream.Two-headedmonstersortheabilitytobreatheunderwaterrarelycomeupwhenI'msleeping.ThemostinterestingdreamI'vehadrecentlyinvolvedmereturningtomycollegejobasanicecreamscooperandmutteringtoacoworker,"Man,thissucks!"Itsuredid.

YetmanyofmyfriendstellmefantasticnighttimetalesofflyingallovertheworldorofscandalousencounterswithCliveOwenonatrain.I'veheardthatit'spossibletocontrolthecourseofourdreamsvialuciddreaming,butIalwaysassumedthatitwasaninnateability.Infact,anyonecanlearntotakethereinsfromthesubconsciousandalterdreamsituations.Usingavarietyoftechniques,wecanturnmundanedreamsintofantasiesthatmakeitevenmoreexcitingtocrawlintobed.

1.DreamJournaling

Agoodplacetostarttheluciddreamingprocessistokeeparecordofpreviousdre,ams.Therearenumerouswaystorememberyourdreams,butoneoftheeasiestandmostpopularistokeepadreamjournal.Putanotebookandpennexttoyourbedandimmediatelyuponwakingwritedowneverythingyoucanrememberfromyourdreams.Ifwritingistoomucheffortsosoonaftersnoozing,tryavoicerecorderinstead.Thepointistokeeptrackconsistentlysothatyore"dreamrecallimprovesovertime.Afterall,what'sthepointofluciddreamingifyoucan'trememberitinthemorning?

2.MnemonicInductionofLucidDreams(MILD)

Thistechnique,createdbypsychophysiologistStephenLaBerge,stressestherecognitionofdreamingwhileit'sinprocess.Beginbymakingitagoaltowakeyourselfupwhenyonnoticethatyou'redreamingandchronicleeverythingyoucanrememberaboutthedream.Asyou'refallingbackasleep,focusonre-enteringyourpreviousdream,butthistimedirectyourselftoexplorethedreaminsteadofwakingyourselfup.KeepthatawarenessasyoufallintoREMsleep(thesleepstageduringwhichluciddreamingmostcommonlyoccurs).Itmighthelptostatealoud,"Iamawareofmydreamstate,"asyoudriftoff.

Lookforindications-alsocalleddreamsigns-thatalertyoutothefactthatyou'redreaming.Thesecouldbeanythingthatareoutoftheordinaryorwouldbeimpossibleinreallife(thepreviously-mentionedtwo-headedmonster,forexample).Thistechniquecantakeawhiletomaster,butwithsteadypractice,youcanlearntorecognizedreamsignswhilestillinthedreamstate,therebyputtingyourselfincontrolofthesituation.

3.RealityTesting

Realitytestingrequiresconstantattentiontotheworldaroundus-bothindreamsandinreallife.Whengoingthroughyourday,perform.smallcheckstodetermineifwhatyou'reseeingispossibleinreality.Theanswerwillusuallybeyessinceyonknowyou'reawake(andit'llprobablyfeelsillyatfirst),buttherepeatedquestioningwillsetyourminduptotakethesameactionsindreams.Forexample,somethingsimplelikeacarnotstartingisoftenoverlookedinadreambecausethat'ssomethingthatcouldhappeninreallife.Butifaspouse'shairisblondeinsteadofbrown,that'saclearsignalforsomeoneusingrealitytestingthatheorsheisactuallydreaming,andthisknowledgeallowsmorecontroloverthecourseofthedream.Togetintothehabit,setanalarmormakeitagoaltodorealitychecksacertainnumberoftimesperday.Thechecksareawaytoteachyourselftonoticeoutoftheordinaryoccurrencesindreamssothatyoucanreachthatcovetedawarenesswithoutfullywakingup.

4.Wake-InitiationofLucidDreams(WILD)

ThosewhousetheWILDmethodtoachieveluciddreamingmustlearntostayatleastsomewhatconscious(butnottooconscious,sincethatmightkeepyouawake)asyourbodymovesintodeepsleep.AccordingtotheL

A.Seeingatwo-headedmonster.

B.Beinganice-creamscooper.

C.Beingabletobreatheunderwater.

D.MeetingCliveOwenonatrain.

11.TheCanadiangovernmentdidn'twanttoreducecod.catchespre-1992becausetheywereworriedabout______.

A.drasticmeasures

B.theecologicaleffects

C.themarineecosystem

D.possiblerisingunemployment

12.

Scientistsgatherinformationaboutclimatesystemsandusethisinformationto______.

13.TaughenedGlass:theSolutiontoRetailOwners'SecurityConcerns

Taughenedglass,whichisalsocalledBastieglassbecauseofthenameoftheinventor,isakindofglassthatisfinelytemperedorannealed,byapeculiarmethodofsuddencoolingbyplungingwhilehotintooil,meltedwax,orparaffine.

Thedevelopmentandacceptanceoftaughenedglasshasundergoneseveralstages.Yetthebenefitsofthisparticularkindofglassstillremainunknowntoalargegroupofpeople.

DuPonthasdoneagreatjobofworkingwitharchitectsandthearchitecturalglassindustrytounderstand,developandpromotetheuseoftaughenedglass(safetyglass)worldwide.Withintheretailenvironmentinparticular,architectsinallcontinentsareusingtaughenedglassforadiverserangeofapplications--notonlyforeconomicandfunctionalreasonsbutalsoforthepureaestheticdelightofusingthematerial.

Yetsadly,thegeneralpublicinNorthAmericaisstilltoooftenignorantofthebenefitstaughenedglasscanbring--notonlyinshopsbutalsoinofficesandhomes.Thematerialisstillalltoooftenperceivedasvaguely"moreexpensive"anditswiderangeofbenefitsremainslargelyunknown.Sharingthebenefitswithbuildingowners-fromthebusinesscommunitytohomeowners--hastobeournextmajorchallenge.

NationalGateandGlassCorp.suppliesstorefrontglasstoretailersthroughoutNorthAmerica,fromnationwidechainstosingleoutletowners.Howeverlargeorsmall,ourcustomershavesimilarconcernswhenitcomestothestorefrontglasstheyusewithregardtocost,appearance/aesthetics,securityandservice.

Thegoodnewsisthatin99.9percentofcases,wefindthattheinstallationof6mm+6mmtaughenedglasswithaninterlayerof0.76mmButacite(r)PVBinterlayersolvesalloftheseconcernswithease!Taughenedglassisanidealsolutionformodemretailersintermsofsamedayinstallation,securityprevention,protectionfromtheUVraysthatcausethedegradationofstoredisplaysandfurnishingsandtheeliminationofboardingfollowingdamagetothestorefront.

TimeIsMoney.

Everyoneintheretailconstructionvaluechain,fromownerstoforemen,areconcernedwithcosts.Weareabletoaddressthisfirstconcernprettyquickly.IntheUSA,taughenedglasscostsalmostexactlythesameastemperedglasstopurchaseandinstallpersquaremeter.InAustraliaandEurope,itcanbesignificantlycheaperthantemperedglass!Inthecaseofbreakage,thecostbenefitsoftaughenedglasscanbeseenveryclearly;asstoreowners,managersandlosspreventiondepartmentsknow,timeismoney!Unliketemperedglass,taughenedglassallowsstorestostayopeninthecaseofbreakagesincecrackedorbrokenglassstaysintheframe.Smallerlocationsthatareboardedupwithplywoodcanleavecustomerswiththeimpressionthattheyareclosed--andnobodycanaffordthat.It'scriticallyimportantthateveryoneknowsthatyouare

BetterLookingstorefronts

Thesecondmajorconcernisaesthetics.Manyofourretailcustomerslocatedindowntownareasautomaticallyassumethatshutterswillhavetobeinstalledtoensureadequatesecurityafterstoreopeninghours.Itisalwaysapleasureformetoseethereliefoncustomers'faceswhenItellthemaboutthesecuritybenefitsoftaughenedglassandhowthematerialeliminatestheneedforshutters,allowingmuchbetterlookingstorefronts.

ARealBoosttotheBottomLine

Athirdconcernissecurity.Thelosspreventionofficersofmajorretailersunderstandperhapsbetterthananyoneelsetheextenttowhichbreak-insandvandalismnegativelyaffectthebottomline.Myretailcustomerstellmethattheaveragecostofabreak,inisUS＄30,000.Thisnotonlyincludesstole

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14.PartⅡReadingComprehension(SkimmingandScanning)

Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,choosethebestanswerfromthefourchoicesmarked[A],[B],[C]and[D].Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.

7HealthProblemsfortheModernAge

Modernlife,withitsemphasisoninformation,automation,computerization,andglobalization,hasmadeworkeasierandgivenusmoreleisureoptions,butwenowhaveawholehostofnewhealthproblems.Onlytimewilltellifthesemodernhealthproblemsdisappearlike8-tracktapesandrotaryphones.Untilthen,herearesomeofthenewmaladieswehaveinstoreforus.

ComputerVisionSyndrome

Ifyouspendalldaystaringatacomputerscreen,youmaybeatriskforcomputervisionsyndrome(CVS),alsocalledoccupationalasthenopia(弱视的).CVSencompassesalleyeorvision-relatedproblemssufferedbypeoplewhospendalotoftimeoncomputers.AccordingtotheAmericanOptometricAssociation,symptomsofCVSincludeheadaches;dry,red,orburningeyes;blurredordoublevision;troublefocusing;difficultydistinguishingcolors;sensitivitytolight;endevenpainintheneckorback.Asmanyas75percentofcomputerusershavesymptomsofCVSduetoglare,poorlighting,andimproperworkstationsetup.ToovercomeCVS,keepyourmonitorabouttwofeetawayfromyouandsixinches.beloweyelevel,andbesureit'sdirectlyinfrontofyontominimizeeyemovement.Adjustlightingto,removeanyglareorreflections.Youcanalsoadjustthebrightnessonyourmonitortoeaseeyestrain.Evensimplestepscanhelp,likelookingawayfromyourmonitorevery20or30minutesandfocusingonsomethingfartheraway.Andyoucanalwaysuseeyedropstoperkupyourpeepers!

Earbud-relatedHearingLoss

Earbudsaretheheadphonesusedwithmanydigitalmusicplayers.Theyfitinsidetheearbutdon'tcanceloutbackgroundnoise,requiringuserstoturnupthevolume,oftento110to120decibels--loudenoughtocausehearinglossafteronlyanhourend15minutes.Andtoday,peoplespendmuchmoretimelisteningtotheirportableplayers,exposingthemselvestodamagingnoiseforlongerperiodsoftime.Asaresult,youngpeoplearedevelopingthetypeofheatinglossnormallyseeninmucholderadults.Expertsrecommendturningdownthevolumeandlimitingdieamountoftimespentlisteningtomusicplayerstoaboutanhouraday.Headphonesthatfitoutsidetheearcanalalsohelp,ascannoise-cancelingheadphonesthatreducebackgroundnoisesolistenersdon'thavetocrankupthevolume.

E-thrombosis

Thisconditionisrelatedtodeepveinthrombosis(血栓症),wherebloodclotsform.indeepveins,suchasthoseinthelegs.Theseclotscanbefataliftheymigratetothelungsandcauseapulmonaryembolism.Clotscanform.whenbloodsupplyslowsorstops,suchasinaperiodofprolongedimmobility.Similarly,e-thrombosisisthedevelopmentofclotsinthedeepveinsofsomeonewhospendslongamountsoftimeinfrontofacomputerwithoutmoving.Althoughonlyahandfulofe-thrombosiscaseshavebeenreported,millionsofpeoplewhospendmostoftheirtimeinfrontofacomputerareatrisk.Avoidinge-thrombosisissimple:standupandmovearoundeveryhour,tapyourtoeswhileyouwork,putequipmentendsuppliesindifferentpartsofyourworkareasoyouhavetomovetogetthem,don'tcrossyourlegswhilesittingatyourdesk,don'tspendyourlunchbreakatyourdesk(goforaquickwalkinstead),anddon'tgettoocomfortable--ifyourworkspaceisultra-cozy,youwon'twanttogetup.

GeneralizedAnxietyDisorder

Weallhaveworries,uncertaintie

A.dry,red,orburningeyesandblurredordoublevision

B.glare,poorlightingandimproperworkstationsetup

C.notkeepingtheirmonitortwofeetawayfromthem

D.notusingacomputerthatprotectstheireyes

15.TheLawofSupplyandDemand

Iftradeistotakeplace,atleasttwoeconomicunitsmustbeinvolved(business,households,tradesmen,etc.):Onemusthavesomethingtosellandtheothermustdesiretheproductoftheseller.Thesetwoeconomicunitsmeetorcommunicatethroughwhatiscalleda"market".Marketscanbephysicalplacessuchasthefarmers'marketinlargecities,thecommoditymarketsinChicago,orthestockexchangesofNewYorkCity.Theycanalsobenothingmorethana"happening"wherebuyerandsellernevermeetbutmaycommunicatehalfwayaroundtheworldbytelephone,radio,etc.Wewillviewamarketasbeingsomecombinationofbuyers(demanders)andsellers(suppliers),whichdealswithadefinablecommodity.Notice,wehavealreadysplittheconceptofmarketintotwosubgroups--demandersandsuppliers.Toseehowmarketsoperate,wewillfirstdeveloptiledemandandsupplyideasseparately;thenwewillcombinethem.

PriceoftheDemandedGoods

Everyoneofyouisfamiliarwiththeconceptofdemand,althoughyoumaynotbeawareofthefact.Toanalyzedemand,wemerelylookatallthethingsthataffectpeople'sdesiresforgoodsandservices.Whataresomeofthesethings?Ifwetalkingabouteconomicgoodsitisimpliedthattogetapieceofgoods,somethingelse(suchasmoneyorsomeothergoods)mustbegivenup.Theamountthatmustbegivenupperunitofthedesiredgoodsisthepriceofthedesiredgoods--$8.00perbookorIshirtperbook.Thusitcanbesaidthatthequantitydemandedofsomegoodsdependspartlyonthepriceofthatgoods.

PricesofSubstituteandComplementaryGoods

Manygoodsareconsumedorusedeitherinsteadoforalongwithsomeothergoods.Inotherwords,theremaybesubstitutesfororcomplementstosomegod&.Examplesofsubstitutesincludebutterandmargarine(人造黄油).automobiletransportationandairlinetransportation,universitytrainingandtechnicalschooltraining.Notice,asubstitutedocsnothavetobethesamegoods,andinfact,substituteimpliesthatitmaynithavetobethesamegoods.Nickelsanddimes,intheproperportions,areperfectsubstitutesinmostcases,buttheyareveryimperfectifonehasonlynickels,thecoffcemachinetakesonlydimes,andnobody'saroundtomakechange.Complementsarefoundinsuchitemsastiresandautomobile,sailsandsailboats,etc.Asyoumayhaveguessed,thepricesoftheserelatedgoodswillundoubtedlyaffectthequantitydemandedofthedesiredgoodsinquestion.MuchasIdislikemargarine(andIcantellthedifference),ifthepriceofbuttergoesmuchhigher(relativetomargarine),Icanassureyou,margarinewillbemuchmoreacceptabletome.Notice,asthepriceofagivengoodsbecomeshigherinrelationtoitssubstitute(orthepriceofsubstitutebecomeslower),thequantitydemandedofthegivengoodswilldecrease.Theconverseistrueforcomplementarygoods.Ifthepriceofautomobilesincreasessubstantiallymydemandforautomobiletireswilldecrease,sinceIwillbebuyingfewerautomobilesonwhichtousethetires.Whiletheexamplemaynotbeveryimportantformeasindividualbuyerofautomobiles,itisveryimportantifonelooksatthetotalmarketincludingallbuyersofautomobilesandautomobiletires.

TheIncomeofPotentialBuyers

Athirditemthatcanaffectthequantitydemandedofgoodsistheincomeofthebuyerorbuyers.Atfirstthought,onewouldthinkthatpeoplewithhighincomeswoulddemandmoregoodsthanthosewithlowincomes.Forsomegoods(economistscallthem"normalorsuperior"goods),thisistrueforexample,thequantitydemandedofRollsRoyceautomobiles.Butforothergoods("inferior"goods)suchasporkandbeans,theoppositeistrue.Forthelattercategory,increasingincomesgivepeoplethechoiceofselectingmoreexpensivefoods,suchas

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16.

InSpanish(PuertoRicoisaSpanish-speakingisland),"nova"means"start",butwhenspoken,"nova"means"itdoesn'tgo."Verynaturally,fewpeoplewould______.

17.Rivers

Byoriginalusage,ariverisflowingwaterinachannelwithdefinedbanks.Modernusageincludesriversthataremultichanneled,intermittent,orephemeralinflowandchannelsthatarepracticallybankless.Theconceptofchanneledsurfaceflow,however,remainscentraltothedefinition.

Riversarenourishedbyprecipitation,bydirectoverlandrunoff,throughspringsandseepages,orfrommeltwaterattheedgesofsnowfieldsandglaciers.Thecontributionofdirectprecipitationonthewatersurfaceisusuallyminute,exceptwheremuchofacatchmentareaisoccupiedbylakes.Riverwaterlossesresultfromseepageintoshallowordeepaquifers(沙石含水层)andparticularlyfromevaporation.Thedifferencebetweenthewaterinputandlosssustainssurfacedischargeorstreamflow.TheamountofwaterinriversystematanytimeisbutatinyfractionoftheEarth'stotalwater;97percentofallwateriscontainedintheoceansandaboutthree-quartersoffreshwaterisstoredaslandice;nearlyalltheremainderoccursasgroundwater.Lakesholdlessthan0.5percentofallfreshwater,soilmoistureaccountsforabout0.05percent,andwaterinriverchannelsforroughlyhalfasmuch,0.025percent,whichrepresentsonlyaboutonefour-thousandthoftheEarth'stotalfreshwater.

Waterisconstantlycycledthroughthesystemsoflandice,soil,lakes,groundwater(inpart),andriverchannels,however.Thedischargeofriverstotheoceansdeliverstothesesystemstheequivalentofthewatervapourthatisblownoverlandandthenconsequentlyprecipitatedasrainorsnow,e.,some7percentofmeanannualprecipitationontheglobeand30percentofprecipitationonlandareas.

Thehistoricalrecordincludesmarkedshiftsintheappreciationofrivers,numerousconflictsinusedemand,andanintensificationofusethathasrapidlyacceleratedduringthe20thcentury.Externalfreighttradebecameconcentratedinestuarineports(河口港)ratherthanininlandportswhenocean-goingvesselsincreasedinsize.

Deman