北美新托福入学测试题中上水平.docx
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北美新托福入学测试题中上水平.docx
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北美新托福入学测试题中上水平
环球新托福考试院入学英语水平测试题
Reading
ExtinctionoftheDinosaurs
Paleontologistshavearguedforalongtimethatthedemiseofthedinosaurswascausedbyclimaticalterationsassociatedwithslowchangesinthepositionsofcontinentsandseasresultingfromplatetectonics.OffandonthroughouttheCretaceous(thelastperiodoftheMesozoicera,duringwhich
/\dinosaursflourished),largeshallowseascoveredextensiveareasofthecontinents.Datafromdiversesources,includinggeochemicalevideneepreservedinseafloorsediments,indicatethattheLate
Cretaceousclimatewasmilderthantoday's.Thedayswerenottoohot,northenightstoocold.The
summerswerenottoowarm,northewinterstoofrigid.Theshallowseasonthecontinentsprobablybufferedthetemperatureofthenearbyair,keepingitrelativelyconstant.
AttheendoftheCretaceous,thegeologicalrecordshowsthattheseseawaysretreatedfromthecontinentsbackintothemajoroceanbasins.Nooneknowswhy.Overaperiodofabout100,000years,whiletheseaspulledback,climatesaroundtheworldbecamedramaticallymoreextreme:
warmerdays,coolernights;hottersummers,colderwinters.Perhapsdinosaurscouldnottoleratetheseextreme
temperaturechangesandbecameextinct.
were
shardtounderstandwhytweyldnotbeaffected,whereas
dinosaurswerelefttoocrippledtocope,especiallyif,assomescientistsbelieve,dinosaurs
warm-blooded.CriticsalsopointoutthattheshallowseawayshadretreatedfromandadvaneedonthecontinentsnumeroustimesduringtheMesozoic,sowhydidthedinosaurssurvivetheclimaticchanges
appealing,the
associatedwiththeearlierfluctuationsbutnotwiththisone?
Althoughinitiallyhypothesisofasimpleclimaticchangerelatedtosealevelsisinsufficienttoexplainallthedata.
Dissatisfactionwithconventionalexplanationsfordinosaurextinctionsled/toasurprising
observationthat,inturn,hassuggestedanewhypothesis.Manyplantsandanimalsdisappear
abruptlyfromthefossilrecordasonemovesfromlayersofrockdocumentingtheendoftheCretaceousupintorocksrepresentingthebeginningoftheCenozoic(theeraaftertheMesozoic).BetweenthelastlayerofCretaceousrockandthefirstlayerofCenozoicrock,thereisoftenathinlayerofclay.Scientistsfeltthattheycouldgetanideaofhowlongtheextinctionstookbydetermininghowlongittooktodepositthisonecentimeterofclayandtheythoughttheycoulddeterminethetimeittooktodeposittheclaybydeterminingtheamountoftheelementiridium(lr)itcontained.
shistory.Becaus,
'scoreasth
IthasnotbeencommonatEarth'ssincetheverybeginningoftheplanet
usuallyexistsinametallicstate,itwaspreferentiallyincorporatedinEarthandconsolidated.ltisfoundinhighconcentrationsinsomemeteorites,inwhichthesolarsystem
originalchemicalcompositionispreserved.Eventoday,microscopicmeteoritescontinuallybombardEarth,fallingonbothlandandsea.BymeasuringhowmanyofthesemeteoritesfalltoEarthoveragivenperiodoftime,scientistscanestimatehowlongitmighthavetakentodeposittheobserved
amountofitintheboundaryclay.Thesecalculationssuggestthataperiodofaboutonemillionyears
wouldhavebeenrequired.However,otherreliableevideneesuggeststhatthedepositionofthe
boundaryclaycouldnothavetakenonemillionyears.Sotheunusuallyhighconcentrationofltseems
torequireaspecialexplanation.
Inviewofthesefacts,scientistshypothesizedthatasinglelargeasteroid,about10to15kilometers
across,collidedwithEarth,andtheresultingfalloutcreatedtheboundaryclay.Theircalculations
showthattheimpactkickedupadustcloudthatcutoffsunlightforseveralmonths,inhibiting
photosynthesisinplants;decreasedsurfacetemperaturesoncontinentstobelowfreezing;caused
extremeepisodesofacidrain;andsignificantlyraisedIong-termglobaltemperaturesthroughthe
greenhouseeffect.Thisdisruptionoffoodchainandclimatewouldhaveeradicatedthedinosaursand
otherorganismsinlessthanfiftyyears.
[PassageEnd]
[Question]
Paragraph1Paleontologistshavearguedforalongtimethatthedemiseofthedinosaurswas
causedbyclimaticalterationsassociatedwithslowchangesinthepositionsofcontinentsandseas
resultingfromplatetectonics.OffandonthroughouttheCretaceous(thelastperiodoftheMesozoicera,duringwhichdinosaursflourished),largeshallowseascoveredextensiveareasofthecontinents.Datafromdiversesources,includinggeochemicalevideneepreservedinseafloorsediments,indicatethatthe
LateCretaceousclimatewasmilderthantoday's.Thedayswerenottoohot,northenightstoocold.
Thesummerswerenottoowarm,northewinterstoofrigid.Theshallowseasonthecontinentsprobablybufferedthetemperatureofthenearbyair,keepingitrelativelyconstant.
1.Accordingtoparagraph1,whichofthefollowingistrueoftheLateCretaceousclimate?
Summerswereverywarmandwinterswereverycold.
Shallowseasonthecontinentscausedfrequenttemperaturechanges.
Theclimatewasverysimilartotoday'sclimate.
Theclimatedidnotchangedramaticallyfromseasontoseason.
Paragraph2AttheendoftheCretaceous,thegeologicalrecordshowsthattheseseawaysretreated
fromthecontinentsbackintothemajoroceanbasins.Nooneknowswhy.Overaperiodofabout100,000years,whiletheseaspulledback,climatesaroundtheworldbecamedramaticallymoreextreme:
warmerdays,coolernights;hottersummers,colderwinters.Perhapsdinosaurscouldnot
toleratetheseextremetemperaturechangesandbecameextinct.
2.Whichofthefollowingreasonsissuggestedinparagraph2fortheextinctionofthedinosaurs?
ChangesinthelengthsofthedaysandnightsduringthelateCretaceousperiod
Droughtscausedbythemovementofseawaysbackintotheoceans
ThechangefrommildtosevereclimatesduringtheLateCretaceousperiod
Anextremedecreaseintheaverageyearlytemperatureover10,000years
Paragraph3Iftrue,though,whydidcold-bloodedanimalssuchassnakes,lizards,turtles,and
crocodilessurvivethefreezingwintersandtorridsummers?
Theseanimalsareatthemercyofthe
climatetomaintainalivablebodytemperature.It'shardtounderstandwhytheywouldnotbe
affected,whereasdinosaurswerelefttoocrippledtocope,especiallyif,assomescientistsbelieve,
dinosaurswerewarm-blooded.CriticsalsopointoutthattheshallowseawayshadretreatedfromandadvaneedonthecontinentsnumeroustimesduringtheMesozoic,sowhydidthedinosaurssurvivetheclimaticchangesassociatedwiththeearlierfluctuationsbutnotwiththisone?
Althoughinitially
appealing,thehypothesisofasimpleclimaticchangerelatedtosealevelsisinsufficienttoexplainallthedata.
3.Whydoestheauthormentionthesurvivalof“snakes,lizards,turtles,andcrocodiles”n
paragraph3?
Toarguethatdinosaursmayhavebecomeextinetbecausetheywerenotcold-bloodedanimals
Toquestiontheadequacyofthehypothesisthatclimaticchangerelatedtosealevelscausedthe
extinctionofthedinosaurs
Topresentexamplesofanimalsthatcouldmaintainalivablebodytemperaturemoreeasilythan
dinosaurs
Tosupportahypothesisthattheseanimalswerenotassensitivetoclimatechangesinthe
Cretaceousperiodastheyaretoday
4.Thewordcopeinthepassageisclosestinmeaningto
adapt
move
continue
compete
5.Thewordfluctuationsinthepassageisclosestinmeaningto
extremes
retreatsperiodsvariations
Paragraph4Dissatisfactionwithconventionalexplanationsfordinosaurextinctionsledtoa
surprisingobservationthat,inturn,hassuggestedanewhypothesis.Manyplantsandanimals
disappearabruptlyfromthefossilrecordasonemovesfromlayersofrockdocumentingtheendoftheCretaceousupintorocksrepresentingthebeginningoftheCenozoic(theeraaftertheMesozoic).BetweenthelastlayerofCretaceousrockandthefirstlayerofCenozoicrock,thereisoftenathinlayerofclay.Scientistsfeltthattheycouldgetanideaofhowlongtheextinctionstookbydetermininghowlongittooktodepositthisonecentimeterofclayandtheythoughttheycoulddeterminethetimeittooktodeposittheclaybydeterminingtheamountoftheelementiridiumitcontained.
6.Whichofthesentencesbelowbestexpressestheessentialinformationinthehighlighted
sentenceinthepassage?
Incorrectchoiceschangethemeaninginimportantwaysorleaveout
essentialinformation.
Thefossilrecordsuggeststhattherewasanabruptextinctionofmanyplantsandanimalsatthe
endoftheMesozoicera.
FewfossilsoftheMesozoicerahavesurvivedintherocksthatmarktheendoftheCretaceous.
FossilsfromtheCretaceousperiodoftheMesozoicuptothebeginningoftheCenozoicerahave
beenremovedfromthelayersofrockthatsurroundedthem.
PlantsandanimalsfromtheMesozoicerawereunabletosurviveintheCenozoicera.
7.Inparagraph4,allthefollowingquestionsareansweredEXCEPT:
WhyistherealayerofclaybetweentherocksoftheCretaceousandCenozoic?
Whywerescientistsinterestedindetermininghowlongittooktodepositthelayerofclayattheend
oftheCretaceous?
Whatwastheeffectofthesurprisingobservationscientistsmade?
Whydidscientistswantmoreinformationaboutthedinosaurextinctionsattheendofthe
Cretaceous?
Paragraph5.lthasnotbeencommonatEarth'ssincetheverybeginningoftheplanet's
Because
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