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{{*HTML*}}阅读下面这篇短文短文后有2项测试任务1第23～26题要求．从所给的6个选项中为第2～5段每段选择1个正确的小标题2第27～30题要求从所给的6个选项中选择4个正确选项分别完成每个句子 ?????????? ????????{{B}}SootandSnow:aHot Combination{{/B}}??1?NewresearchfromNASAscientists suggestsemissionsofblacksootalterthewaysunlightreflectsoffsnow. Accordingtoacomputersimulationblacksootmayberesponsiblefor25percent ofobservedglobalwarmingoverthepastcentury.??2?Soot inthehigherlatitudesoftheEarthwhereiceismorecommonabsorbsmoreof thesun’senergyandwarmththananicywhitebackground.Dark-coloredblack carbonorsootabsorbssunlightwhilelightercoloredicereflects sunlight.??3?Sootinareaswithsnowandicemayplayan importantroleinclimatechange.Alsoifsnowandicecoveredareasbegin meltingthewarmingeffectincreasesasthesootbecomesmoreconcentratedon thesnowsurface.Thisprovidesapositivefeedbackasglaciersandicesheets melttheytendtogetevendirtiersaidDr.JamesHansenaresearcherat NASA’sGoddardInstituteforSpaceStudiesNewYork.??4 ?Hansenfoundsoot’seffectonsnowalbedosolarenergyreflectedbackto spacewhichmaybecontributingmtrendstowardearlyspringsintheNorthern HemispheresuchasthinningArcticseaicemeltingglaciersandpermafrost. Sootalsoisbelievedtoplayaroleinchangesintheatmosphereabovethe oceansandland.??5?Blackcarbonreducestheamountof energyreflectedbysnowbackintospacethusheatingthesnowsurfacemore thaniftherewerenoblackcarbonHansensaid.Soot’sincreasedabsorptionof solarenergyisespeciallyeffectiveinwarmingtheworld’sclimate.This forcingisunusuallyeffectivecausingtwiceasmuchglobalwarmingasa carbon-dioxideforcingofthesamemagnitudeHansennoted.??6 ?Hansencautionedalthoughtheroleofsootinalteringglobalclimateis substantialitdoesnotalterthefactthatgreenhousegasesaretheprimary causeofclimatewarmingduringthepastcenturySuchgasesareexpectedtobe thelargestclimateforcingfortherestofthiscentury.??7 ?TheresearchersfoundthatobservedwarmingintheNorthernHemispherewas largeinthewinterandspringatmiddleandhighlatitudes.Theseobservations wereconsistentwiththeresearchers’climatemodelsimulationswhichshowed someofthelargestwarmingeffectsoccurredwhentherewereheavysnowcover andsufficientsunlight.Paragraph6______
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
PhotojournalistMargaretWhitebecamefamousforher{{U}}coverage{{/U}}ofsignificanteventsduringtheSecondWorldWar.
{{*HTML*}}{{B}}第三篇{{/B}} ASunshadeforthePlanet? ?Evenwiththebestwillintheworldreducingourcarbonemissionsisnot goingtopreventglobalwarming.Ithasbecomeclearthatevenifwetakethe moststrongmeasurestocontrolemissionstheuncertainties不确定inour climatemodelsstillleaveopenthepossibilityofextremewarmingandrisesin sealevel.Atthesametimeresistancebygovernmentsandspecialinterest groupsmakesitquitepossiblethattheactionssuggestedbyclimatescientists mightnotbeimplemented执行soonenough.??Fortunatelyifthe worstcomestotheworstscientistsstillhaveafewtricksuptheirsleeves. Forthemostparttheyhavestronglyresisteddiscussingtheseoptionsforfear ofinvitingasenseofcomplacencythatmightthwarteffortstotackletheroot oftheproblem.Untilnowthatis.Agrowingnumberofresearchersaretakinga freshlookatlarge-scalegeoengineeringprojectsthatmightbeusedto counteract抵消globalwarming.IusetheanalogyofmethadonesaysStephen SchneideraclimateresearcheratStanfordUniversityinCaliforniawhowas amongthefirsttodrawattentiontoglobalwarming.Ifyouhaveaheroin addictthecorrecttreatmentishospitalizationandalongrehaB.Butifthey absolutelyrefusemethadoneisbetterthanheroin.??Basically theideaistoapplysunscreentothewholeplanet.Oneastronomerhascomeup witharadicalplantocoolEarth;launchtrillionsoffeather-lightdiscsinto spacewheretheywouldformavastcloudthatwouldblockthesun’srays.It’s controversialbutrecentstudiessuggesttherearewaystodeflectjustenough ofthesunlightreachingtheEarth’ssurfacetocounteractthewarmingproduced bythegreenhouseeffect.Globalclimatemodelsshowthatblockingjust1.8per centoftheincidentenergyinthesun’srayswouldcanceloutthewarming effectsproducedbyadoublingofgreenhousegasesintheatmosphere.Thatcould becrucialbecauseeventhemostsevereemissions-controlmeasuresbeing proposedwouldleaveuswithadoublingofcarbondioxidebytheendofthis centuryandthatwouldlastforatleastacentury more.WhatisStephenSchneider’sideaofpreventingglobalwarming?
Icatchcold{{U}}nowandthen{{/U}}.
{{*HTML*}}阅读下面这篇短文短文后列出7个句子请根据短文的内容对每个句子做出判断 ??????? ??????????? ?{{B}}ElNino{{/B}}??Whilesomeforecastingmethodshadlimited successpredictingthe1997ElNinoafewmonthsinadvancetheColumbia UniversityresearcherssaytheirmethodcanpredictlargeElSinoeventsupto twoyearsinadvance.Thatwouldbegoodnewsforgovernmentsfarmersand othersseekingtoplanforthedroughtsandheavyrainfallthatElNinocan produceinvariouspartsoftheworld.??Usingacomputerthe researchersmatchedsea-surfacetemperaturestolaterElNinooccurrences between1980and2000andwerethenabletoanticipateElNinoeventsdating backto1857usingpriorsea-surfacetemperatures.Theresultswerereportedin thelatestissueofthejournalNature.??Theresearcherssay theirmethodisnotperfectbutBryanC.Weareameteorologistatthe UniversityofCaliforniaDaviswhowasnotinvolvedintheworksaidit suggestsElNinoisindeedpredictable.??Thiswillprobably convinceotherstosearcharoundmoreforevenbettermethodssaidWeare.He addedthatthenewmethodmakesitpossibletopredictElNinoatlonglead timess.Othermodelsalsousesea-surfacetemperaturesbuttheyhavenot lookedasfarbackbecausetheyneedotherdatawhichisonlyavailablefor recentdecadesWearesaid.??Theabilitytopredictthewarming andcoolingofthePacificisofimmenseimportance4.The1997ElNinofor examplecausedanestimated$20billionindamageworldwideoffsetby beneficialeffectsinotherareassaidDavidAndersonoftheEuropeanCentre forMedium-RangeWeatherForecastsinReadingEngland.The1877ElNino meanwhilecoincidedwithafailureoftheIndianmonsoonandafaminethat killedperhaps40millioninIndiaandChinapromptingthedevelopmentof seasonalforecastingAndersonsaid.??WhenElNinohitin1991 and1997200millionpeoplewereaffectedbyfloodinginChinaaloneaccording toa2002UnitedNationsreport.??WhilepredictingsmallerEl Ninoeventsremainstrickytheabilitytopredictlargeronesshouldbe increasedtoatleastayearffthenewmethodisconfirmed.??El NinotendstodevelopbetweenAprilandJuneandreachesitspeakbetween DecemberandFebruary.Thewarmingtendstolastbetween9and12monthsand occurseverytwotosevenyears.??Thenewforecastingmethoddoes notpredictanymajorElNinoeventsinthenexttwoyearsalthoughaweak warmingtowardtheendofthisyearispossible.TheColumbiaUniversityresearchersstudiedtherelationshipbetweenthepastElNinooccurrencesandsea-surfacetemperatures.
{{*HTML*}}{{B}}第二篇{{/B}} FlyingtheHypertSkies? ?Alittleairplanehasgivennewmeaningtothetermgoinghyper. ??TheHyper-Xrecentlybroketherecordforair-breathingjet planeswhenittraveledatahypersonicspeedofseventimesthespeedofsound. That’sabout5000milesperhour.Atthisspeedyou’dgetaroundtheworld-- flyingalongtheequator赤道--inlessthan5hours.??The Hyper-Xisanunmannedexperimentalaircraftjust12feetlong.Itachieves hypersonic超音速的speedusingaspecialsortofengineknownasascramjet.It maysoundlikesomethingfromacomicbookbutengineershavebeenexperimenting withscramjetssincethe1960s.??Foranenginetoburnfueland produceenergyitneedsoxygen.Ajetenginelikethoseonpassenger airplanesgetsoxygenfromtheair.Arocketenginetypicallygoesfasterbut hastocarryitsownsupplyofoxygen.Ascramjet紧急刹车enginegoesasfastas arocketbutitdoesn’thavetocarryitsownoxygensupply.Ascramjet’s specialdesignallowsittoobtainoxygenfromtheairthatflowsthroughthe engine.Anditdoessowithoutlettingthefast-movingairputoutthe combustion燃烧flames.Howeverascramjetengineworksproperlyonlyatspeeds greaterthanfivetimesthespeedofsound.AboosterrocketcarriedtheHyper-X toanaltitudeofabout100000feetforitstestflight.Theaircraft’s record-beatingflightlastedjust11seconds.Althoughthelittleplane’s self-poweredflightlastedonly11secondsthatbriefjourneyonMarch27makes amajormilestoneonthewaytoanewbreedofveryfastairplanescomments WernerJ.A.DahmoftheUniversityofMichiganinAnnArbor.Inthefuture engineerspredictairplanesequippedwithscramjetenginescouldtransport cargoquicklyandcheaplytothebrinkofspace.Suchhypersonicjetscould potentiallycarrypassengersanywhereintheworldinjustafew hours.??OutofthethreeexperimentalHyper-Xaircraftsbuiltfor NASAonlyoneisnowleft.Theagencyhasplansforanother11-second hypersonicflightthistimeat10timesthespeedofthe sound.TheHyper-Xbroketherecordbecause
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
{{*HTML*}}阅读下面这篇短文短文后有2项测试任务1第23～26题要求．从所给的6个选项中为第2～5段每段选择1个正确的小标题2第27～30题要求从所给的6个选项中选择4个正确选项分别完成每个句子 ?????????? ????????{{B}}SootandSnow:aHot Combination{{/B}}??1?NewresearchfromNASAscientists suggestsemissionsofblacksootalterthewaysunlightreflectsoffsnow. Accordingtoacomputersimulationblacksootmayberesponsiblefor25percent ofobservedglobalwarmingoverthepastcentury.??2?Soot inthehigherlatitudesoftheEarthwhereiceismorecommonabsorbsmoreof thesun’senergyandwarmththananicywhitebackground.Dark-coloredblack carbonorsootabsorbssunlightwhilelightercoloredicereflects sunlight.??3?Sootinareaswithsnowandicemayplayan importantroleinclimatechange.Alsoifsnowandicecoveredareasbegin meltingthewarmingeffectincreasesasthesootbecomesmoreconcentratedon thesnowsurface.Thisprovidesapositivefeedbackasglaciersandicesheets melttheytendtogetevendirtiersaidDr.JamesHansenaresearcherat NASA’sGoddardInstituteforSpaceStudiesNewYork.??4 ?Hansenfoundsoot’seffectonsnowalbedosolarenergyreflectedbackto spacewhichmaybecontributingmtrendstowardearlyspringsintheNorthern HemispheresuchasthinningArcticseaicemeltingglaciersandpermafrost. Sootalsoisbelievedtoplayaroleinchangesintheatmosphereabovethe oceansandland.??5?Blackcarbonreducestheamountof energyreflectedbysnowbackintospacethusheatingthesnowsurfacemore thaniftherewerenoblackcarbonHansensaid.Soot’sincreasedabsorptionof solarenergyisespeciallyeffectiveinwarmingtheworld’sclimate.This forcingisunusuallyeffectivecausingtwiceasmuchglobalwarmingasa carbon-dioxideforcingofthesamemagnitudeHansennoted.??6 ?Hansencautionedalthoughtheroleofsootinalteringglobalclimateis substantialitdoesnotalterthefactthatgreenhousegasesaretheprimary causeofclimatewarmingduringthepastcenturySuchgasesareexpectedtobe thelargestclimateforcingfortherestofthiscentury.??7 ?TheresearchersfoundthatobservedwarmingintheNorthernHemispherewas largeinthewinterandspringatmiddleandhighlatitudes.Theseobservations wereconsistentwiththeresearchers’climatemodelsimulationswhichshowed someofthelargestwarmingeffectsoccurredwhentherewereheavysnowcover andsufficientsunlight.Paragraph3______ A?Soot’sRoleinChangesintheClimateandtheAtmosphere B?ObservationsofWarmingintheNorthernHemisphere C?ExplanationofIncreasedWarmingEffectCausedbySoot D?EfforttoReduceSnowAlbedo E?WaystoReduceSootEmission F?GreenhouseGasesastheMainFactorofGlobalWarming
{{*HTML*}}下面的短文有5处空白短文后有6个句子其中5个取自短文请根据短文内容将其分别放回原有位置以恢复文章原貌 TheBuildingofthePyramids? ?Theoldeststonebuildingsintheworldarethepyramids.Theyhavestood fornearly5000yearsanditseemslikethat{{U}}?46?{{/U}}.There areovereightyofthemscattered分散的alongthebanksoftheNilesomeof whicharedifferentinshapefromthetruepyramids.Themostfamousofthese aretheSteppyramidandtheBentpyramid.??Someofthe pyramidsstilllookmuchthesameastheymusthavedonewhentheywerebuilt thousandsofyearsago.Mostofthedamagesufferedbytheothershasbeenat thehandsofmenwhowerelookingfortreasureormoreoften{{U}}?47 ?{{/U}}.ThedryclimateofEgypthashelpedtopreservethepyramidsand theirveryshape{{U}}?48?{{/U}}.Thesearegoodreasonswhytheycan stillbeseentodaybutperhapsthemostimportantisthattheywereplannedto lastforever.??Itispracticallycertainthatplansweremade forthebuildingofthepyramids{{U}}?49?{{/U}}.Howeverthereareno writingsorpicturestoshowushowtheEgyptiansplannedorbuiltthepyramids themselves.Consequentlyweareonlyabletoguessatthemethodsused. Neverthelessbyexaminingtheactualpyramidsandvarioustoolswhichhavebeen foundarchaeologists考古学家haveformedafairlyclearpictureof them.??Onethingiscertaintheremusthavebeenmonthsof carefulplanning{{U}}?50?{{/U}}.Thefirstthingtheyhadtodowasto chooseasuitableplace.Youmaythinkthiswouldhavebeeneasywithmilesand milesofemptydesertaroundbutapyramidcouldnotbebuiltjustanywhere. Certainruleshadtobefollowedandcertainproblemshadtobe overcome.??A.forstonetouseinmodernbuildings? ?B.hasmadethemlesslikelytofallintoruin??C.before theycouldbegintobuild??D.becausetheplansofotherlarge workshavefortunatelybeenpreserved??E.whilebuildingthe pyramids??F.theywillcontinuetostandforthousandsofyears yet
{{*HTML*}}{{B}}第二篇{{/B}} FlyingtheHypertSkies? ?Alittleairplanehasgivennewmeaningtothetermgoinghyper. ??TheHyper-Xrecentlybroketherecordforair-breathingjet planeswhenittraveledatahypersonicspeedofseventimesthespeedofsound. That’sabout5000milesperhour.Atthisspeedyou’dgetaroundtheworld-- flyingalongtheequator赤道--inlessthan5hours.??The Hyper-Xisanunmannedexperimentalaircraftjust12feetlong.Itachieves hypersonic超音速的speedusingaspecialsortofengineknownasascramjet.It maysoundlikesomethingfromacomicbookbutengineershavebeenexperimenting withscramjetssincethe1960s.??Foranenginetoburnfueland produceenergyitneedsoxygen.Ajetenginelikethoseonpassenger airplanesgetsoxygenfromtheair.Arocketenginetypicallygoesfasterbut hastocarryitsownsupplyofoxygen.Ascramjet紧急刹车enginegoesasfastas arocketbutitdoesn’thavetocarryitsownoxygensupply.Ascramjet’s specialdesignallowsittoobtainoxygenfromtheairthatflowsthroughthe engine.Anditdoessowithoutlettingthefast-movingairputoutthe combustion燃烧flames.Howeverascramjetengineworksproperlyonlyatspeeds greaterthanfivetimesthespeedofsound.AboosterrocketcarriedtheHyper-X toanaltitudeofabout100000feetforitstestflight.Theaircraft’s record-beatingflightlastedjust11seconds.Althoughthelittleplane’s self-poweredflightlastedonly11secondsthatbriefjourneyonMarch27makes amajormilestoneonthewaytoanewbreedofveryfastairplanescomments WernerJ.A.DahmoftheUniversityofMichiganinAnnArbor.Inthefuture engineerspredictairplanesequippedwithscramjetenginescouldtransport cargoquicklyandcheaplytothebrinkofspace.Suchhypersonicjetscould potentiallycarrypassengersanywhereintheworldinjustafew hours.??OutofthethreeexperimentalHyper-Xaircraftsbuiltfor NASAonlyoneisnowleft.Theagencyhasplansforanother11-second hypersonicflightthistimeat10timesthespeedofthe sound.WhatisNOTtrueaboutthescramjetengine?
{{*HTML*}}下面的短文有5处空白短文后有6个句子其中5个取自短文请根据短文内容将其分别放回原有位置以恢复文章原貌 TheBuildingofthePyramids? ?Theoldeststonebuildingsintheworldarethepyramids.Theyhavestood fornearly5000yearsanditseemslikethat{{U}}?46?{{/U}}.There areovereightyofthemscattered分散的alongthebanksoftheNilesomeof whicharedifferentinshapefromthetruepyramids.Themostfamousofthese aretheSteppyramidandtheBentpyramid.??Someofthe pyramidsstilllookmuchthesameastheymusthavedonewhentheywerebuilt thousandsofyearsago.Mostofthedamagesufferedbytheothershasbeenat thehandsofmenwhowerelookingfortreasureormoreoften{{U}}?47 ?{{/U}}.ThedryclimateofEgypthashelpedtopreservethepyramidsand theirveryshape{{U}}?48?{{/U}}.Thesearegoodreasonswhytheycan stillbeseentodaybutperhapsthemostimportantisthattheywereplannedto lastforever.??Itispracticallycertainthatplansweremade forthebuildingofthepyramids{{U}}?49?{{/U}}.Howeverthereareno writingsorpicturestoshowushowtheEgyptiansplannedorbuiltthepyramids themselves.Consequentlyweareonlyabletoguessatthemethodsused. Neverthelessbyexaminingtheactualpyramidsandvarioustoolswhichhavebeen foundarchaeologists考古学家haveformedafairlyclearpictureof them.??Onethingiscertaintheremusthavebeenmonthsof carefulplanning{{U}}?50?{{/U}}.Thefirstthingtheyhadtodowasto chooseasuitableplace.Youmaythinkthiswouldhavebeeneasywithmilesand milesofemptydesertaroundbutapyramidcouldnotbebuiltjustanywhere. Certainruleshadtobefollowedandcertainproblemshadtobe overcome.??A.forstonetouseinmodernbuildings? ?B.hasmadethemlesslikelytofallintoruin??C.before theycouldbegintobuild??D.becausetheplansofotherlarge workshavefortunatelybeenpreserved??E.whilebuildingthe pyramids??F.theywillcontinuetostandforthousandsofyears yet
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
Injudgingourworkyoushouldtakeinto{{U}}consideration{{/U}}thefactthatwehavebeenverybusyrecently.
Heoften{{U}}findsfaultwith{{/U}}mywork.
America'semphasisontheimportanceofeducationforeveryonehas{{U}}spurred{{/U}}scientificresearch.
{{*HTML*}}阅读下面这篇短文短文后有2项测试任务1第23～26题要求．从所给的6个选项中为第2～5段每段选择1个正确的小标题2第27～30题要求从所给的6个选项中选择4个正确选项分别完成每个句子 ?????????? ????????{{B}}SootandSnow:aHot Combination{{/B}}??1?NewresearchfromNASAscientists suggestsemissionsofblacksootalterthewaysunlightreflectsoffsnow. Accordingtoacomputersimulationblacksootmayberesponsiblefor25percent ofobservedglobalwarmingoverthepastcentury.??2?Soot inthehigherlatitudesoftheEarthwhereiceismorecommonabsorbsmoreof thesun’senergyandwarmththananicywhitebackground.Dark-coloredblack carbonorsootabsorbssunlightwhilelightercoloredicereflects sunlight.??3?Sootinareaswithsnowandicemayplayan importantroleinclimatechange.Alsoifsnowandicecoveredareasbegin meltingthewarmingeffectincreasesasthesootbecomesmoreconcentratedon thesnowsurface.Thisprovidesapositivefeedbackasglaciersandicesheets melttheytendtogetevendirtiersaidDr.JamesHansenaresearcherat NASA’sGoddardInstituteforSpaceStudiesNewYork.??4 ?Hansenfoundsoot’seffectonsnowalbedosolarenergyreflectedbackto spacewhichmaybecontributingmtrendstowardearlyspringsintheNorthern HemispheresuchasthinningArcticseaicemeltingglaciersandpermafrost. Sootalsoisbelievedtoplayaroleinchangesintheatmosphereabovethe oceansandland.??5?Blackcarbonreducestheamountof energyreflectedbysnowbackintospacethusheatingthesnowsurfacemore thaniftherewerenoblackcarbonHansensaid.Soot’sincreasedabsorptionof solarenergyisespeciallyeffectiveinwarmingtheworld’sclimate.This forcingisunusuallyeffectivecausingtwiceasmuchglobalwarmingasa carbon-dioxideforcingofthesamemagnitudeHansennoted.??6 ?Hansencautionedalthoughtheroleofsootinalteringglobalclimateis substantialitdoesnotalterthefactthatgreenhousegasesaretheprimary causeofclimatewarmingduringthepastcenturySuchgasesareexpectedtobe thelargestclimateforcingfortherestofthiscentury.??7 ?TheresearchersfoundthatobservedwarmingintheNorthernHemispherewas largeinthewinterandspringatmiddleandhighlatitudes.Theseobservations wereconsistentwiththeresearchers’climatemodelsimulationswhichshowed someofthelargestwarmingeffectsoccurredwhentherewereheavysnowcover andsufficientsunlight.Inthetwentiethcenturysoot______. A?producesmuchmoreglobalwarmingthanacarbon-dioxideforcing0fthesamemagnitude B?contributedto25percentofobservedglobalwarming C?canproducegreenhousegases D?absorbmoreofsun’senergyandwarmththanwhitebackground Estillsurpasssootinwarmingtheworld’sclimateduringthelastcentury FcanbeseenmostlyintheNorthernHemisphere
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
{{*HTML*}}{{B}}第三篇{{/B}} ASunshadeforthePlanet? ?Evenwiththebestwillintheworldreducingourcarbonemissionsisnot goingtopreventglobalwarming.Ithasbecomeclearthatevenifwetakethe moststrongmeasurestocontrolemissionstheuncertainties不确定inour climatemodelsstillleaveopenthepossibilityofextremewarmingandrisesin sealevel.Atthesametimeresistancebygovernmentsandspecialinterest groupsmakesitquitepossiblethattheactionssuggestedbyclimatescientists mightnotbeimplemented执行soonenough.??Fortunatelyifthe worstcomestotheworstscientistsstillhaveafewtricksuptheirsleeves. Forthemostparttheyhavestronglyresisteddiscussingtheseoptionsforfear ofinvitingasenseofcomplacencythatmightthwarteffortstotackletheroot oftheproblem.Untilnowthatis.Agrowingnumberofresearchersaretakinga freshlookatlarge-scalegeoengineeringprojectsthatmightbeusedto counteract抵消globalwarming.IusetheanalogyofmethadonesaysStephen SchneideraclimateresearcheratStanfordUniversityinCaliforniawhowas amongthefirsttodrawattentiontoglobalwarming.Ifyouhaveaheroin addictthecorrecttreatmentishospitalizationandalongrehaB.Butifthey absolutelyrefusemethadoneisbetterthanheroin.??Basically theideaistoapplysunscreentothewholeplanet.Oneastronomerhascomeup witharadicalplantocoolEarth;launchtrillionsoffeather-lightdiscsinto spacewheretheywouldformavastcloudthatwouldblockthesun’srays.It’s controversialbutrecentstudiessuggesttherearewaystodeflectjustenough ofthesunlightreachingtheEarth’ssurfacetocounteractthewarmingproduced bythegreenhouseeffect.Globalclimatemodelsshowthatblockingjust1.8per centoftheincidentenergyinthesun’srayswouldcanceloutthewarming effectsproducedbyadoublingofgreenhousegasesintheatmosphere.Thatcould becrucialbecauseeventhemostsevereemissions-controlmeasuresbeing proposedwouldleaveuswithadoublingofcarbondioxidebytheendofthis centuryandthatwouldlastforatleastacentury more.Scientistsresisttalkingabouttheiroptionsbecausetheydon’twantpeopleto
{{*HTML*}}阅读下面这篇短文短文后列出7个句子请根据短文的内容对每个句子做出判断 ??????? ??????????? ?{{B}}ElNino{{/B}}??Whilesomeforecastingmethodshadlimited successpredictingthe1997ElNinoafewmonthsinadvancetheColumbia UniversityresearcherssaytheirmethodcanpredictlargeElSinoeventsupto twoyearsinadvance.Thatwouldbegoodnewsforgovernmentsfarmersand othersseekingtoplanforthedroughtsandheavyrainfallthatElNinocan produceinvariouspartsoftheworld.??Usingacomputerthe researchersmatchedsea-surfacetemperaturestolaterElNinooccurrences between1980and2000andwerethenabletoanticipateElNinoeventsdating backto1857usingpriorsea-surfacetemperatures.Theresultswerereportedin thelatestissueofthejournalNature.??Theresearcherssay theirmethodisnotperfectbutBryanC.Weareameteorologistatthe UniversityofCaliforniaDaviswhowasnotinvolvedintheworksaidit suggestsElNinoisindeedpredictable.??Thiswillprobably convinceotherstosearcharoundmoreforevenbettermethodssaidWeare.He addedthatthenewmethodmakesitpossibletopredictElNinoatlonglead timess.Othermodelsalsousesea-surfacetemperaturesbuttheyhavenot lookedasfarbackbecausetheyneedotherdatawhichisonlyavailablefor recentdecadesWearesaid.??Theabilitytopredictthewarming andcoolingofthePacificisofimmenseimportance4.The1997ElNinofor examplecausedanestimated$20billionindamageworldwideoffsetby beneficialeffectsinotherareassaidDavidAndersonoftheEuropeanCentre forMedium-RangeWeatherForecastsinReadingEngland.The1877ElNino meanwhilecoincidedwithafailureoftheIndianmonsoonandafaminethat killedperhaps40millioninIndiaandChinapromptingthedevelopmentof seasonalforecastingAndersonsaid.??WhenElNinohitin1991 and1997200millionpeoplewereaffectedbyfloodinginChinaaloneaccording toa2002UnitedNationsreport.??WhilepredictingsmallerEl Ninoeventsremainstrickytheabilitytopredictlargeronesshouldbe increasedtoatleastayearffthenewmethodisconfirmed.??El NinotendstodevelopbetweenAprilandJuneandreachesitspeakbetween DecemberandFebruary.Thewarmingtendstolastbetween9and12monthsand occurseverytwotosevenyears.??Thenewforecastingmethoddoes notpredictanymajorElNinoeventsinthenexttwoyearsalthoughaweak warmingtowardtheendofthisyearispossible.IttakesabouteightmonthsforElNinotoreachitspeak.
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
I'mnotmeddlingMarysaid{{U}}mildly{{/U}}.I'mjustcurious.
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
ManyofnovelistCarsonMcCullers'charactersare{{U}}isolated{{/U}}disappointedpeople.
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 TheDevelopmentofRubber? ?Hereisthestoryofrubber.Fromtheearliesttimeitwascommon knowledge{{U}}?51?{{/U}}thePeruviansthatwhenacutwasmadeinthe outsideskinofarubbertreeawhiteliquid{{U}}?52?{{/U}}milkcame outandthat{{U}}?53?{{/U}}thisasticky粘的massofrubbermight bemade.Thisrubberissoftwhenwarmsothatitispossibletogiveitany {{U}}?54?{{/U}}.ThePeruviansmadethe{{U}}?55?{{/U}}that itwasverygoodforkeepingoutthewet.Thenintheearly1800’sthe Americansmadeuseofitforthefirsttime.?Firsttheymadeovershoesto {{U}}?56?{{/U}}theirfeetdry.?ThencameacertainMr. Mackintoshwhomadecoatsofclothcoveredwithnaturalrubber.Fromthatday tothiswehavebeencoatingclothwithrubberasMr.Mackintosh{{U}}?57 ?{{/U}}andourraincoatsarestillnamedafterhim.??But thesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer and{{U}}?58?{{/U}}andinelastic无弹性的inthewinterwhenitwascol D.Buttherubberwehavetodayissoftandelastic有弹性的{{U}}?59 ?{{/U}}verystrongmeveninthewarmestsummerandthecoldestwinter.This wasmade{{U}}?60?{{/U}}byamancalledGoodyear.Aftermany {{U}}?61?{{/U}}hefoundthatnitricacid硝酸madetherubbermuch betterbutitisnothardandstrongenough.?Thenastrangething took??{{U}}?62?{{/U}}.AfriendofhisNicholas Haywardhadtheideainhissleepthatrubbermightbemadehardandstrongif mixedwithsulfur硫磺andputinthesun.Goodyearputthisidea{{U}}?63 ?{{/U}}thetestandsawthatitdidhavemoreorlessthedesiredeffect thoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideofthe rubber.Itiscommonknowledgenowthatthe{{U}}?64?{{/U}}tomake rubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmore yearstofindthismethoD.Whenatlasthedidithehad{{U}}?65 ?{{/U}}atall.Everythingofthesmallestvaluehadbeenusedtogetmoney evenhissons’school-books.
{{*HTML*}}阅读下面这篇短文短文后列出7个句子请根据短文的内容对每个句子做出判断 ??????? ??????????? ?{{B}}ElNino{{/B}}??Whilesomeforecastingmethodshadlimited successpredictingthe1997ElNinoafewmonthsinadvancetheColumbia UniversityresearcherssaytheirmethodcanpredictlargeElSinoeventsupto twoyearsinadvance.Thatwouldbegoodnewsforgovernmentsfarmersand othersseekingtoplanforthedroughtsandheavyrainfallthatElNinocan produceinvariouspartsoftheworld.??Usingacomputerthe researchersmatchedsea-surfacetemperaturestolaterElNinooccurrences between1980and2000andwerethenabletoanticipateElNinoeventsdating backto1857usingpriorsea-surfacetemperatures.Theresultswerereportedin thelatestissueofthejournalNature.??Theresearcherssay theirmethodisnotperfectbutBryanC.Weareameteorologistatthe UniversityofCaliforniaDaviswhowasnotinvolvedintheworksaidit suggestsElNinoisindeedpredictable.??Thiswillprobably convinceotherstosearcharoundmoreforevenbettermethodssaidWeare.He addedthatthenewmethodmakesitpossibletopredictElNinoatlonglead timess.Othermodelsalsousesea-surfacetemperaturesbuttheyhavenot lookedasfarbackbecausetheyneedotherdatawhichisonlyavailablefor recentdecadesWearesaid.??Theabilitytopredictthewarming andcoolingofthePacificisofimmenseimportance4.The1997ElNinofor examplecausedanestimated$20billionindamageworldwideoffsetby beneficialeffectsinotherareassaidDavidAndersonoftheEuropeanCentre forMedium-RangeWeatherForecastsinReadingEngland.The1877ElNino meanwhilecoincidedwithafailureoftheIndianmonsoonandafaminethat killedperhaps40millioninIndiaandChinapromptingthedevelopmentof seasonalforecastingAndersonsaid.??WhenElNinohitin1991 and1997200millionpeoplewereaffectedbyfloodinginChinaaloneaccording toa2002UnitedNationsreport.??WhilepredictingsmallerEl Ninoeventsremainstrickytheabilitytopredictlargeronesshouldbe increasedtoatleastayearffthenewmethodisconfirmed.??El NinotendstodevelopbetweenAprilandJuneandreachesitspeakbetween DecemberandFebruary.Thewarmingtendstolastbetween9and12monthsand occurseverytwotosevenyears.??Thenewforecastingmethoddoes notpredictanymajorElNinoeventsinthenexttwoyearsalthoughaweak warmingtowardtheendofthisyearispossible.Weare’scontributioninpredictingElNinowashighlypraisedbyothermeteorologists.
{{*HTML*}}下面的短文有5处空白短文后有6个句子其中5个取自短文请根据短文内容将其分别放回原有位置以恢复文章原貌 TheBuildingofthePyramids? ?Theoldeststonebuildingsintheworldarethepyramids.Theyhavestood fornearly5000yearsanditseemslikethat{{U}}?46?{{/U}}.There areovereightyofthemscattered分散的alongthebanksoftheNilesomeof whicharedifferentinshapefromthetruepyramids.Themostfamousofthese aretheSteppyramidandtheBentpyramid.??Someofthe pyramidsstilllookmuchthesameastheymusthavedonewhentheywerebuilt thousandsofyearsago.Mostofthedamagesufferedbytheothershasbeenat thehandsofmenwhowerelookingfortreasureormoreoften{{U}}?47 ?{{/U}}.ThedryclimateofEgypthashelpedtopreservethepyramidsand theirveryshape{{U}}?48?{{/U}}.Thesearegoodreasonswhytheycan stillbeseentodaybutperhapsthemostimportantisthattheywereplannedto lastforever.??Itispracticallycertainthatplansweremade forthebuildingofthepyramids{{U}}?49?{{/U}}.Howeverthereareno writingsorpicturestoshowushowtheEgyptiansplannedorbuiltthepyramids themselves.Consequentlyweareonlyabletoguessatthemethodsused. Neverthelessbyexaminingtheactualpyramidsandvarioustoolswhichhavebeen foundarchaeologists考古学家haveformedafairlyclearpictureof them.??Onethingiscertaintheremusthavebeenmonthsof carefulplanning{{U}}?50?{{/U}}.Thefirstthingtheyhadtodowasto chooseasuitableplace.Youmaythinkthiswouldhavebeeneasywithmilesand milesofemptydesertaroundbutapyramidcouldnotbebuiltjustanywhere. Certainruleshadtobefollowedandcertainproblemshadtobe overcome.??A.forstonetouseinmodernbuildings? ?B.hasmadethemlesslikelytofallintoruin??C.before theycouldbegintobuild??D.becausetheplansofotherlarge workshavefortunatelybeenpreserved??E.whilebuildingthe pyramids??F.theywillcontinuetostandforthousandsofyears yet{{*HTML*}}
{{*HTML*}}{{B}}第二篇{{/B}} FlyingtheHypertSkies? ?Alittleairplanehasgivennewmeaningtothetermgoinghyper. ??TheHyper-Xrecentlybroketherecordforair-breathingjet planeswhenittraveledatahypersonicspeedofseventimesthespeedofsound. That’sabout5000milesperhour.Atthisspeedyou’dgetaroundtheworld-- flyingalongtheequator赤道--inlessthan5hours.??The Hyper-Xisanunmannedexperimentalaircraftjust12feetlong.Itachieves hypersonic超音速的speedusingaspecialsortofengineknownasascramjet.It maysoundlikesomethingfromacomicbookbutengineershavebeenexperimenting withscramjetssincethe1960s.??Foranenginetoburnfueland produceenergyitneedsoxygen.Ajetenginelikethoseonpassenger airplanesgetsoxygenfromtheair.Arocketenginetypicallygoesfasterbut hastocarryitsownsupplyofoxygen.Ascramjet紧急刹车enginegoesasfastas arocketbutitdoesn’thavetocarryitsownoxygensupply.Ascramjet’s specialdesignallowsittoobtainoxygenfromtheairthatflowsthroughthe engine.Anditdoessowithoutlettingthefast-movingairputoutthe combustion燃烧flames.Howeverascramjetengineworksproperlyonlyatspeeds greaterthanfivetimesthespeedofsound.AboosterrocketcarriedtheHyper-X toanaltitudeofabout100000feetforitstestflight.Theaircraft’s record-beatingflightlastedjust11seconds.Althoughthelittleplane’s self-poweredflightlastedonly11secondsthatbriefjourneyonMarch27makes amajormilestoneonthewaytoanewbreedofveryfastairplanescomments WernerJ.A.DahmoftheUniversityofMichiganinAnnArbor.Inthefuture engineerspredictairplanesequippedwithscramjetenginescouldtransport cargoquicklyandcheaplytothebrinkofspace.Suchhypersonicjetscould potentiallycarrypassengersanywhereintheworldinjustafew hours.??OutofthethreeexperimentalHyper-Xaircraftsbuiltfor NASAonlyoneisnowleft.Theagencyhasplansforanother11-second hypersonicflightthistimeat10timesthespeedofthe sound.WhathasNASAplannedtodo?
{{*HTML*}}下面有3篇短文每篇短文后有5道题请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} ElectricBackpack? ?Backpacks背包areconvenient.Theycanholdyourbooksyourlunchanda changeofclothesleavingyourhandsfreetodootherthings.Somedayifyou don’tmindcarryingaheavyloadyourbackpacksmightalsopoweryourMP3 playerkeepyourcellphonerunningandmaybeevenlightyourway home.??LawrenceC.RomeandhiscolleaguesfromtheUniversityof PennsylvaniainPhiladelphiaandtheMarineBiologicalLaboratoryinWoodsHole Mass.haveinventedabackpackthatmakeselectricityfromenergyproduced whileitswearerwalks.Inmilitaryactionssearch-and-rescueoperationsand scientificfieldstudiespeoplerelyincreasinglyoncellphonesglobal positioningsystemGPSreceiversnight-vision夜视镜goggles护目镜another batterypowereddevicestogetaroundanddotheirwork.Thebackpack’s electricity-generatingfeaturecoulddramaticallyreducetheamounto{a wearer’sloadnowdevotedtosparebatteries备用电池reportRomeandhis colleaguesintheSept.9Science.??Thebackpack’s electricity-creatingpowersdependonspringsusedtohangaclothpackfromits metalframe.Theframesitsagainstthewearer’sbackandthewholepackmoves upandclownasthepersonwalks.Agearmechanismconvertsverticalmovementso{ thepacktorotarymotionsofanelectricalgeneratorproducingupto7.4 watts.??Unexpectedlytestsshowedthatwearersofthenew backpackaltertheirgaitsinresponsetothepack’soscillationssothatthey carryloadsmorecomfortablyandwithlesseffortthantheydoordinary backpacks.BecauseofthatsurprisingadvantageRomeplanstocommercialize bothelectricandnon-electricversionsofthebackpack.??The backpackcouldbeespeciallyusefulforsoldiersscientistsmountaineersand emergencyworkerswhotypicallycarryheavybackpacks.Fortherestof uspower-generatingbackpackscouldmakeitpossibletowalkplayvideogames watchTVandlistentomusicallatthesametime.Electricity-generatingpacks aren’tonthemarketyetbutifyoudogetoneeventuallyjust makesuretolookbothwaysbeforecrossingthestreet !AccordingtoParagraph4whatdoesRomeplantodo?
Thelittlegirl{{U}}grasped{{/U}}hermother'sarmasshecrossedthestreet.
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