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{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句是正确信息请选择A如果该句是错误信息请选择B如果该句的信息文中没有提及请选择C ?? Earthquake??Howdoesan earthquakestart???Whatmakesanearthquakehappen?Therockof theearth’scrust地壳mayhaveafaultakindofbreakinthesurface.The blockswhichmakeuptheearthmoveandsometimesthismaycausethesidesof thefaulttomoveupanddownorlengthways纵向地againsteachother.Whenone pieceofrockstartstorubonanotherwithgreatforcealotofenergyis used.Thisenergyischangedintovibrations振动anditisthesevibrations thatwereefasanearthquake.Thevibrationscantravelthousandsofkilometers andsoanearthquakeinTurkeymaybefeltinGreece.??Whattodo duringanearthquake???Atschool??Assoonasthe earthquakestartsstudentsshouldgetunderthedesksimmediatelyandwait untiltheteachertellsthemitissafetocomeout.Theteachershouldatthe sametimegoimmediatelytotheteacher’sdeskgetunderneath在下面itand staytheretillthedangerisover.Studentsmustnotarguewiththeteacheror questioninstructions.??Assoonasthetremors震动stopall studentsshouldwalktowardstheexitandgostraighttotheschoolplayground oranyopenspacesuchasasquareorapark.Theymustwaitthereuntilthe teachertellsthemitissafetogo.??Athome??If youareathomewhentheearthquakeoccursgetimmediatelyunderthetablein thelivingroomorkitchen.Choosethebiggestandstrongesttableyoucanfind. Youmustnotgoanywherenearthewindowanddon’tgooutontothebalcony阳台. Oncethetremorshavestoppedyoucancomeoutfromunderthetablebutyou mustleavethebuildingstraightaway.Youshouldwalkdownthestairsand shouldnotusethelift—theremaybeapowercutasaresultoftheearthquake andyoucouldfindyourselftrappedinsidetheliftforhours.? ?Inthestreet??Ifyouareinthestreetwhentheearthquake takesplacedonotstandnearbuildingsfencesorwalls—moveawayasquickly aspossibleandtrytofindalargeopenspacetowaitin.Standingundertrees couldalsobedangerous.Peopleknewlongagohowanearthquakestarts.
{{*HTML*}}下面的短文后有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个最佳标题2第27-30题要求从所给的6个选项中为每个句子确定1个最佳选项 ?? EvenIntelligentPeopleCan Fail??1?Thestrikingthingaboutthe innovatorswhosucceededinmakingourmodernworldishowoftentheyfailed. TurnoilalighttakeaphotographwatchTVsearchthewebjetacrossthe PacificOceantalkonacellphone手机.Theinnovatorswholeftusthese thingshadtofindthewaytosuccessthroughamaze错综复杂ofwrong turn.??2?Wehavejustcelebratedthe125thanniversaryof AmericaninnovatorThomasEdison’ssuccessinheatinginthinlinetowhitehot heatfor14hoursinhislabinNewJerseyUS.HedidthatonOctober221879 andfollowedupamonthlaterbykeepingathreadofcommoncardboardalight 点亮着的inanairlessspacefor45hours.Threeyearslaterhewentontolight uphalfasquaremileofdowntownManhattaneventhoughonlyoneofthesix powerplantsinhisdesignworkedwhenheturneditononSeptember4 1882.??3?Manyoflife’sfailuresthesupremeinnovator saidarepeoplewhodidnotrealizehowclosetheyweretosuccesswhenthey gaveup.BeforethatmagicalmomentinOctober1879Edisonhadworkedoutno fewerthan3000theoriesaboutelectriclight.Butinonlytwocasesdidhis experimentswork.??4?Noonelikesfailurebutthesmart innovatorslearnfromit.MarkGumztheheadofthecameramakerOlympus AmericaInc.attributessomeofthecompany’ssuccessesintechnologyto understandingfailure.HispopularphraseisYouonlyfailwhenyou quit.??5?Overtwocenturiesthemostcommonqualityof theinnovatorshasbeenpersistence.Thatisanotherwayofsayingtheyhadthe emotionalabilitytokeepupwhattheyweredoing.WaltDisneythefounderof Disneylandwassobrokeafterasuccessionoffinancialfailuresthathewas leftshoelessinhisofficebecausehecouldnotaffordtheUS$1.50togethis shoesfromtherepairshop.PioneeringCarmakerHenryFordfailedwithone companyandwasforcedoutofanotherbeforehedevelopedtheModelT Car.??6?Failureishardertobearintoday’sopen acceleratedworld.Hardlyanyinnovationworksthefirsttime.Butanimpatient societyandthemediawantinstantsuccess.WhenAmericanmusicandmoviemaster DavidGeffenhadadifficulttimeacriticsaidnastilythattheonly differencebetweenGeffenRecordsGeffen’scompanyandtheTitanictheship thatwentdownwasthattheTitanichadbettermusic.Actuallyitwasn’t. AfterfouryearsoflossesGeffenhadsomanyhits成功的hecouldaffordaship asbigastheTitanicalltohimself.A．ImportanceofLearningfrom FailureB．QualitySharedbyMostInnovatorsC．Edison’s InnovationD．Edison’sCommentonFailureE.ContributionsMadeby InnovatorsF.MiseriesEnduredbyInnovatorsParagraph5______
{{*HTML*}}A．hedeveloped3000theoriesB．hecouldn’taffordtobuyapairof shoesC．hefoundhimselfanunsuccessfulmanD．theyquittedE.an innovationshouldworkimmediatelyF.failureisthemotherofsuccessBeforeHenryFordeventuallydevelopedtheModelTcar______.
{{*HTML*}}下面的短文后有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个最佳标题2第27-30题要求从所给的6个选项中为每个句子确定1个最佳选项 ?? EvenIntelligentPeopleCan Fail??1?Thestrikingthingaboutthe innovatorswhosucceededinmakingourmodernworldishowoftentheyfailed. TurnoilalighttakeaphotographwatchTVsearchthewebjetacrossthe PacificOceantalkonacellphone手机.Theinnovatorswholeftusthese thingshadtofindthewaytosuccessthroughamaze错综复杂ofwrong turn.??2?Wehavejustcelebratedthe125thanniversaryof AmericaninnovatorThomasEdison’ssuccessinheatinginthinlinetowhitehot heatfor14hoursinhislabinNewJerseyUS.HedidthatonOctober221879 andfollowedupamonthlaterbykeepingathreadofcommoncardboardalight 点亮着的inanairlessspacefor45hours.Threeyearslaterhewentontolight uphalfasquaremileofdowntownManhattaneventhoughonlyoneofthesix powerplantsinhisdesignworkedwhenheturneditononSeptember4 1882.??3?Manyoflife’sfailuresthesupremeinnovator saidarepeoplewhodidnotrealizehowclosetheyweretosuccesswhenthey gaveup.BeforethatmagicalmomentinOctober1879Edisonhadworkedoutno fewerthan3000theoriesaboutelectriclight.Butinonlytwocasesdidhis experimentswork.??4?Noonelikesfailurebutthesmart innovatorslearnfromit.MarkGumztheheadofthecameramakerOlympus AmericaInc.attributessomeofthecompany’ssuccessesintechnologyto understandingfailure.HispopularphraseisYouonlyfailwhenyou quit.??5?Overtwocenturiesthemostcommonqualityof theinnovatorshasbeenpersistence.Thatisanotherwayofsayingtheyhadthe emotionalabilitytokeepupwhattheyweredoing.WaltDisneythefounderof Disneylandwassobrokeafterasuccessionoffinancialfailuresthathewas leftshoelessinhisofficebecausehecouldnotaffordtheUS$1.50togethis shoesfromtherepairshop.PioneeringCarmakerHenryFordfailedwithone companyandwasforcedoutofanotherbeforehedevelopedtheModelT Car.??6?Failureishardertobearintoday’sopen acceleratedworld.Hardlyanyinnovationworksthefirsttime.Butanimpatient societyandthemediawantinstantsuccess.WhenAmericanmusicandmoviemaster DavidGeffenhadadifficulttimeacriticsaidnastilythattheonly differencebetweenGeffenRecordsGeffen’scompanyandtheTitanictheship thatwentdownwasthattheTitanichadbettermusic.Actuallyitwasn’t. AfterfouryearsoflossesGeffenhadsomanyhits成功的hecouldaffordaship asbigastheTitanicalltohimself.A．ImportanceofLearningfrom FailureB．QualitySharedbyMostInnovatorsC．Edison’s InnovationD．Edison’sCommentonFailureE.ContributionsMadeby InnovatorsF.MiseriesEnduredbyInnovatorsParagraph3______
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
{{*HTML*}}{{B}}第二篇{{/B}} ?? KobeBryant??After10 seasonswearingtheNo.8onhisbackKobeBryantwillbecomeNo.24next season.ThereasonforthesurprisingdecisionbytheLosAngelesLakerssuper guardlastweekhasbecomeahottopicfordebate.??Bryantwore No.24whenhewasinearlyhighschoolbuthechangedtoNo.33inhissenior year.HeswitchedtoNo.8whenhewasselectedbytheLakersin1996andhas notbeenchangedsince.??Bryanthasrefusedtoexplainthe decisionuntiltheendoftheplay-offs季后赛.SoguessingBryant’smotivehas becomeapopulargameamongNBAfansandnewspapercolumnists专栏作家.? ?Thereareallkindsofspeculations.ManysaythatBryantwantstoleave thepastbehindandhaveafreshstart.Hehasoftenbeencriticizedforplaying tobenefithimselfandnottheteamasawhole.Otherssaythathemaybetrying tocomparehimselftoMichaelJordan.JordanwasfamousforhisNo.23 jersey运动衫.SomesuchasNBASportcolumnistMichaelVenterarguethatitis allaboutmoney.Bryantwillmakemoremoneybysellingnewjerseystohis fans.??Somespeculationsaremoreaboutfun.Forexamplethere isanopinionthatKobeisactuallyjustadiehard非常执著的fanofthepopularTV drama24.??Allthistalkhasturnedthenumberchangeintoa majorissue.Itseemsthatthereisalotoffuss大惊小怪oversomethingthat shouldbeprettysimple.??Jerseynumbershavetheirownspecial significanceinAmericansportsespeciallybasketball.Playerschoosetheir numberwhentheyjoinateamandtheyusuallystickwiththatnumberforthe restoftheircareer.Whenagreatplayerretireshisteamwillhonorhimby retiringhisnumber.??Tosomeextentthejerseyistheplayer andtheplayeristhejersey.ThuswhenyouseethefamousNo.23forthe ChicagoBullsyouimmediatelythinkaboutMichaelJordan.ANo.32MiamiHeats jerseyrecallstheimageofShaquilleO’NealandtheHoustonRocketsNo.11 belongsonlytoYaoMing.??Lotsofstoriesarebehindplayers’ jerseynumberselections.JordansaidthathechoseNo.23becauseitwas roughlyhalfof45．Jordan’selderbrotherworetheNo.45incollege.YaoMing oncerevealedthattheNo.11standsfortwopeopleinlove—meaninghimandhis girlfriendYeLi.WhatdoesthenumberYaoMingchosestandfor?
{{*HTML*}}{{B}}第二篇{{/B}} ?? KobeBryant??After10 seasonswearingtheNo.8onhisbackKobeBryantwillbecomeNo.24next season.ThereasonforthesurprisingdecisionbytheLosAngelesLakerssuper guardlastweekhasbecomeahottopicfordebate.??Bryantwore No.24whenhewasinearlyhighschoolbuthechangedtoNo.33inhissenior year.HeswitchedtoNo.8whenhewasselectedbytheLakersin1996andhas notbeenchangedsince.??Bryanthasrefusedtoexplainthe decisionuntiltheendoftheplay-offs季后赛.SoguessingBryant’smotivehas becomeapopulargameamongNBAfansandnewspapercolumnists专栏作家.? ?Thereareallkindsofspeculations.ManysaythatBryantwantstoleave thepastbehindandhaveafreshstart.Hehasoftenbeencriticizedforplaying tobenefithimselfandnottheteamasawhole.Otherssaythathemaybetrying tocomparehimselftoMichaelJordan.JordanwasfamousforhisNo.23 jersey运动衫.SomesuchasNBASportcolumnistMichaelVenterarguethatitis allaboutmoney.Bryantwillmakemoremoneybysellingnewjerseystohis fans.??Somespeculationsaremoreaboutfun.Forexamplethere isanopinionthatKobeisactuallyjustadiehard非常执著的fanofthepopularTV drama24.??Allthistalkhasturnedthenumberchangeintoa majorissue.Itseemsthatthereisalotoffuss大惊小怪oversomethingthat shouldbeprettysimple.??Jerseynumbershavetheirownspecial significanceinAmericansportsespeciallybasketball.Playerschoosetheir numberwhentheyjoinateamandtheyusuallystickwiththatnumberforthe restoftheircareer.Whenagreatplayerretireshisteamwillhonorhimby retiringhisnumber.??Tosomeextentthejerseyistheplayer andtheplayeristhejersey.ThuswhenyouseethefamousNo.23forthe ChicagoBullsyouimmediatelythinkaboutMichaelJordan.ANo.32MiamiHeats jerseyrecallstheimageofShaquilleO’NealandtheHoustonRocketsNo.11 belongsonlytoYaoMing.??Lotsofstoriesarebehindplayers’ jerseynumberselections.JordansaidthathechoseNo.23becauseitwas roughlyhalfof45．Jordan’selderbrotherworetheNo.45incollege.YaoMing oncerevealedthattheNo.11standsfortwopeopleinlove—meaninghimandhis girlfriendYeLi.WhichteamhasBryantplayedfor?
{{*HTML*}}{{B}}第二篇{{/B}} ?? KobeBryant??After10 seasonswearingtheNo.8onhisbackKobeBryantwillbecomeNo.24next season.ThereasonforthesurprisingdecisionbytheLosAngelesLakerssuper guardlastweekhasbecomeahottopicfordebate.??Bryantwore No.24whenhewasinearlyhighschoolbuthechangedtoNo.33inhissenior year.HeswitchedtoNo.8whenhewasselectedbytheLakersin1996andhas notbeenchangedsince.??Bryanthasrefusedtoexplainthe decisionuntiltheendoftheplay-offs季后赛.SoguessingBryant’smotivehas becomeapopulargameamongNBAfansandnewspapercolumnists专栏作家.? ?Thereareallkindsofspeculations.ManysaythatBryantwantstoleave thepastbehindandhaveafreshstart.Hehasoftenbeencriticizedforplaying tobenefithimselfandnottheteamasawhole.Otherssaythathemaybetrying tocomparehimselftoMichaelJordan.JordanwasfamousforhisNo.23 jersey运动衫.SomesuchasNBASportcolumnistMichaelVenterarguethatitis allaboutmoney.Bryantwillmakemoremoneybysellingnewjerseystohis fans.??Somespeculationsaremoreaboutfun.Forexamplethere isanopinionthatKobeisactuallyjustadiehard非常执著的fanofthepopularTV drama24.??Allthistalkhasturnedthenumberchangeintoa majorissue.Itseemsthatthereisalotoffuss大惊小怪oversomethingthat shouldbeprettysimple.??Jerseynumbershavetheirownspecial significanceinAmericansportsespeciallybasketball.Playerschoosetheir numberwhentheyjoinateamandtheyusuallystickwiththatnumberforthe restoftheircareer.Whenagreatplayerretireshisteamwillhonorhimby retiringhisnumber.??Tosomeextentthejerseyistheplayer andtheplayeristhejersey.ThuswhenyouseethefamousNo.23forthe ChicagoBullsyouimmediatelythinkaboutMichaelJordan.ANo.32MiamiHeats jerseyrecallstheimageofShaquilleO’NealandtheHoustonRocketsNo.11 belongsonlytoYaoMing.??Lotsofstoriesarebehindplayers’ jerseynumberselections.JordansaidthathechoseNo.23becauseitwas roughlyhalfof45．Jordan’selderbrotherworetheNo.45incollege.YaoMing oncerevealedthattheNo.11standsfortwopeopleinlove—meaninghimandhis girlfriendYeLi.WhichofthefollowingisNOTaspeculationaboutBryant’smotivetochangehisnumberaccordingtothispassage?
{{*HTML*}}下面有3篇短文每篇短文后有5道题每道题后面有4个选项请仔细阅读短文并根据短文回答其后面的问题从4个选项中选择1个最佳答案{{B}}第一篇{{/B}} ?? CloneFarm??Factory farmingcouldsoonenteraneweraofmassproduction.CompaniesintheUSare developingthetechnologyneededtoclonechickensonamassivescale.Oncea chickenwithdesirabletraitshasbeenbredorgeneticallyengineeredtensof thousandsofeggswhichwillhatchintoidenticalcopiescouldrolloffthe productionlineseveryhour.Billionsofclonescouldbeproducedeachyearto supplychickenfarmswithbirdsthatallgrowatthesameratehavethesame amountofmeatandtastethesame.??Thisatleastisthevision oftheUS’sNationalInstituteofScienceandTechnologywhichhasgivenOrigen TherapeuticsofBurlingameCaliforniaandEmbrexofNorthCarolina$4.7 milliontohelpfundresearch.Theprospecthasalarmedanimalwelfaregroups whofearitcouldincreasethesufferingoffarmbirds.??That’s unlikelytoputoffthepoultryindustryhoweverwhichwantsdiseaseresistant birdsthatgrowfasteronlessfood.Producerswouldlikethesamemeat quantitybuttousereducedinputstogetthere.saysMikeFitzgeraldof Origen.TomeetthisdemandOrigenaimstocreateananimalthatis effectivelyaclonehesays.Normalcloningdoesn’tworkinbirdsbecauseeggs can’tberemovedandimplanted.Insteadthecompanyistryingtobulk-grow embryonicstemcellstakenfromfertilizedeggsassoonasthey’relaid.The trickistoculturethecellswithoutthemstartingtodistinguishsothey remainpluripotent.saysFitzgerald.??Usingalong-established techniquethesedonorcellswillthenbeinjectedintotheembryoofafreshly laidfertilizedrecipienteggformingachickthatisachimera.Strictly speakingachimeraisn’taclonebecauseitcontainscellsfrombothdonorand recipient.ButFitzgeraldsaysitwillbeenoughif95percentofachicken’s bodydevelopsfromdonorcells.Inthepoultryworlditdoesn’tmatterifit’s not100percent.hesays.??AnotherchallengeforOrigenisto scaleupproduction.TodothisithasteamedupwithEmbrexwhichproduces machinesthatcaninjectvaccinesintoupto50000eggsanhour.Embrexisnow tryingtomodifythemachinestolocatetheembryoandinjectthecellsinto preciselytherightspotwithoutkillingit.??InfutureOrigen imaginesfreezingstemcellsfromdifferentstrainsofchicken.Iforderscome inforaparticularstrainmillionsofeggscouldbeproducedinmonthsoreven weeks.Atpresentmaintainingallthevarietiesthemarketmightcallforis tooexpensiveforbreedersandittakesyearstobreadenoughchickensto producethebillionsofeggsthatfarmersneed.WhichofthefollowingstatementsaboutOrigenandEmbrexiscorrectaccordingtothefifthparagraph?
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句是正确信息请选择A如果该句是错误信息请选择B如果该句的信息文中没有提及请选择C ?? Earthquake??Howdoesan earthquakestart???Whatmakesanearthquakehappen?Therockof theearth’scrust地壳mayhaveafaultakindofbreakinthesurface.The blockswhichmakeuptheearthmoveandsometimesthismaycausethesidesof thefaulttomoveupanddownorlengthways纵向地againsteachother.Whenone pieceofrockstartstorubonanotherwithgreatforcealotofenergyis used.Thisenergyischangedintovibrations振动anditisthesevibrations thatwereefasanearthquake.Thevibrationscantravelthousandsofkilometers andsoanearthquakeinTurkeymaybefeltinGreece.??Whattodo duringanearthquake???Atschool??Assoonasthe earthquakestartsstudentsshouldgetunderthedesksimmediatelyandwait untiltheteachertellsthemitissafetocomeout.Theteachershouldatthe sametimegoimmediatelytotheteacher’sdeskgetunderneath在下面itand staytheretillthedangerisover.Studentsmustnotarguewiththeteacheror questioninstructions.??Assoonasthetremors震动stopall studentsshouldwalktowardstheexitandgostraighttotheschoolplayground oranyopenspacesuchasasquareorapark.Theymustwaitthereuntilthe teachertellsthemitissafetogo.??Athome??If youareathomewhentheearthquakeoccursgetimmediatelyunderthetablein thelivingroomorkitchen.Choosethebiggestandstrongesttableyoucanfind. Youmustnotgoanywherenearthewindowanddon’tgooutontothebalcony阳台. Oncethetremorshavestoppedyoucancomeoutfromunderthetablebutyou mustleavethebuildingstraightaway.Youshouldwalkdownthestairsand shouldnotusethelift—theremaybeapowercutasaresultoftheearthquake andyoucouldfindyourselftrappedinsidetheliftforhours.? ?Inthestreet??Ifyouareinthestreetwhentheearthquake takesplacedonotstandnearbuildingsfencesorwalls—moveawayasquickly aspossibleandtrytofindalargeopenspacetowaitin.Standingundertrees couldalsobedangerous.Assoonasanearthquakeoccursstudentsshouldleavethebuilding.
{{*HTML*}}下面有3篇短文每篇短文后有5道题每道题后面有4个选项请仔细阅读短文并根据短文回答其后面的问题从4个选项中选择1个最佳答案{{B}}第一篇{{/B}} ?? CloneFarm??Factory farmingcouldsoonenteraneweraofmassproduction.CompaniesintheUSare developingthetechnologyneededtoclonechickensonamassivescale.Oncea chickenwithdesirabletraitshasbeenbredorgeneticallyengineeredtensof thousandsofeggswhichwillhatchintoidenticalcopiescouldrolloffthe productionlineseveryhour.Billionsofclonescouldbeproducedeachyearto supplychickenfarmswithbirdsthatallgrowatthesameratehavethesame amountofmeatandtastethesame.??Thisatleastisthevision oftheUS’sNationalInstituteofScienceandTechnologywhichhasgivenOrigen TherapeuticsofBurlingameCaliforniaandEmbrexofNorthCarolina$4.7 milliontohelpfundresearch.Theprospecthasalarmedanimalwelfaregroups whofearitcouldincreasethesufferingoffarmbirds.??That’s unlikelytoputoffthepoultryindustryhoweverwhichwantsdiseaseresistant birdsthatgrowfasteronlessfood.Producerswouldlikethesamemeat quantitybuttousereducedinputstogetthere.saysMikeFitzgeraldof Origen.TomeetthisdemandOrigenaimstocreateananimalthatis effectivelyaclonehesays.Normalcloningdoesn’tworkinbirdsbecauseeggs can’tberemovedandimplanted.Insteadthecompanyistryingtobulk-grow embryonicstemcellstakenfromfertilizedeggsassoonasthey’relaid.The trickistoculturethecellswithoutthemstartingtodistinguishsothey remainpluripotent.saysFitzgerald.??Usingalong-established techniquethesedonorcellswillthenbeinjectedintotheembryoofafreshly laidfertilizedrecipienteggformingachickthatisachimera.Strictly speakingachimeraisn’taclonebecauseitcontainscellsfrombothdonorand recipient.ButFitzgeraldsaysitwillbeenoughif95percentofachicken’s bodydevelopsfromdonorcells.Inthepoultryworlditdoesn’tmatterifit’s not100percent.hesays.??AnotherchallengeforOrigenisto scaleupproduction.TodothisithasteamedupwithEmbrexwhichproduces machinesthatcaninjectvaccinesintoupto50000eggsanhour.Embrexisnow tryingtomodifythemachinestolocatetheembryoandinjectthecellsinto preciselytherightspotwithoutkillingit.??InfutureOrigen imaginesfreezingstemcellsfromdifferentstrainsofchicken.Iforderscome inforaparticularstrainmillionsofeggscouldbeproducedinmonthsoreven weeks.Atpresentmaintainingallthevarietiesthemarketmightcallforis tooexpensiveforbreedersandittakesyearstobreadenoughchickensto producethebillionsofeggsthatfarmersneed.Whichinstitutionhasoffered$4.7milliontofundtheresearch?
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{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
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{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句是正确信息请选择A如果该句是错误信息请选择B如果该句的信息文中没有提及请选择C ?? Earthquake??Howdoesan earthquakestart???Whatmakesanearthquakehappen?Therockof theearth’scrust地壳mayhaveafaultakindofbreakinthesurface.The blockswhichmakeuptheearthmoveandsometimesthismaycausethesidesof thefaulttomoveupanddownorlengthways纵向地againsteachother.Whenone pieceofrockstartstorubonanotherwithgreatforcealotofenergyis used.Thisenergyischangedintovibrations振动anditisthesevibrations thatwereefasanearthquake.Thevibrationscantravelthousandsofkilometers andsoanearthquakeinTurkeymaybefeltinGreece.??Whattodo duringanearthquake???Atschool??Assoonasthe earthquakestartsstudentsshouldgetunderthedesksimmediatelyandwait untiltheteachertellsthemitissafetocomeout.Theteachershouldatthe sametimegoimmediatelytotheteacher’sdeskgetunderneath在下面itand staytheretillthedangerisover.Studentsmustnotarguewiththeteacheror questioninstructions.??Assoonasthetremors震动stopall studentsshouldwalktowardstheexitandgostraighttotheschoolplayground oranyopenspacesuchasasquareorapark.Theymustwaitthereuntilthe teachertellsthemitissafetogo.??Athome??If youareathomewhentheearthquakeoccursgetimmediatelyunderthetablein thelivingroomorkitchen.Choosethebiggestandstrongesttableyoucanfind. Youmustnotgoanywherenearthewindowanddon’tgooutontothebalcony阳台. Oncethetremorshavestoppedyoucancomeoutfromunderthetablebutyou mustleavethebuildingstraightaway.Youshouldwalkdownthestairsand shouldnotusethelift—theremaybeapowercutasaresultoftheearthquake andyoucouldfindyourselftrappedinsidetheliftforhours.? ?Inthestreet??Ifyouareinthestreetwhentheearthquake takesplacedonotstandnearbuildingsfencesorwalls—moveawayasquickly aspossibleandtrytofindalargeopenspacetowaitin.Standingundertrees couldalsobedangerous.Ifyouareathomewhenanearthquakeoccursstandnearabigtable.
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
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{{*HTML*}}A．hedeveloped3000theoriesB．hecouldn’taffordtobuyapairof shoesC．hefoundhimselfanunsuccessfulmanD．theyquittedE.an innovationshouldworkimmediatelyF.failureisthemotherofsuccessThemediademandthat______.
{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句是正确信息请选择A如果该句是错误信息请选择B如果该句的信息文中没有提及请选择C ?? Earthquake??Howdoesan earthquakestart???Whatmakesanearthquakehappen?Therockof theearth’scrust地壳mayhaveafaultakindofbreakinthesurface.The blockswhichmakeuptheearthmoveandsometimesthismaycausethesidesof thefaulttomoveupanddownorlengthways纵向地againsteachother.Whenone pieceofrockstartstorubonanotherwithgreatforcealotofenergyis used.Thisenergyischangedintovibrations振动anditisthesevibrations thatwereefasanearthquake.Thevibrationscantravelthousandsofkilometers andsoanearthquakeinTurkeymaybefeltinGreece.??Whattodo duringanearthquake???Atschool??Assoonasthe earthquakestartsstudentsshouldgetunderthedesksimmediatelyandwait untiltheteachertellsthemitissafetocomeout.Theteachershouldatthe sametimegoimmediatelytotheteacher’sdeskgetunderneath在下面itand staytheretillthedangerisover.Studentsmustnotarguewiththeteacheror questioninstructions.??Assoonasthetremors震动stopall studentsshouldwalktowardstheexitandgostraighttotheschoolplayground oranyopenspacesuchasasquareorapark.Theymustwaitthereuntilthe teachertellsthemitissafetogo.??Athome??If youareathomewhentheearthquakeoccursgetimmediatelyunderthetablein thelivingroomorkitchen.Choosethebiggestandstrongesttableyoucanfind. Youmustnotgoanywherenearthewindowanddon’tgooutontothebalcony阳台. Oncethetremorshavestoppedyoucancomeoutfromunderthetablebutyou mustleavethebuildingstraightaway.Youshouldwalkdownthestairsand shouldnotusethelift—theremaybeapowercutasaresultoftheearthquake andyoucouldfindyourselftrappedinsidetheliftforhours.? ?Inthestreet??Ifyouareinthestreetwhentheearthquake takesplacedonotstandnearbuildingsfencesorwalls—moveawayasquickly aspossibleandtrytofindalargeopenspacetowaitin.Standingundertrees couldalsobedangerous.Ifyouareinthestreetwhenanearthquakeoccursstayinalargeopenspace.
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{{*HTML*}}??阅读下面的短文文章中有5处空白文章后面有6组文字请根据文章的内容选择 5组文字将其分别放回文章原有位置以恢复文章原貌 {{B}}?????????? ??????????? ???ScienceandTechnology{{/B}}??Thereisa differencebetweenscienceandtechnology.{{U}}?46?{{/U}}Sciencehas todowithdiscoveringthefactsandrelationshipsbetweenobservablephenomena innatureandwithestablishingtheoriesthatservetoorganizethesefactsand relationships;technologyhastodowithtoolstechniquesandproceduresfor applyingthefindingsofscience.{{U}}?47?{{/U}}? ?Progressinscienceexcludesthehumanfactor.Scientistswhoseekto understandtheuniverseandknowthetruthwithinthehighestdegreeofaccuracy andcertaintycannotpayattentiontotheirownorotherpeople’slikesor dislikesortopopularideasaboutthefitnessofthings.{{U}}?48 ?{{/U}}Butevenanunpleasanttruthismorethanlikelytobeuseful; besideswehavethechoiceofrefusingtobelieveit!Buthardlysowith technology;wedonothavethechoiceofrefusingtohearthesoundproducedby asupersonic超音速的aircraftflyingoverhead;wecannotrefusetobreathe pollutedair.{{U}}?49?{{/U}}Thepurposeoftechnologyistoserve people—peopleingeneralnotmerelysomepeople;andfuturegenerationsnot merelythosewhopresentlywishtogainadvantageforthemselves.? ?{{U}}?50?{{/U}}Manypeopleblametechnologyitselffor widespreadpollutionresourcedepletion枯竭andevensocialdecayingeneral— somuchsothatthepromiseoftechnologyisobscured.Thatpromiseisa cleanerandhealthierworldIfwiseapplicationsofscienceandtechnologydo notleadtoabetterworldwhatelsewill?A.Anotherdistinctionbetween scienceandtechnologyhastodowiththeprogressineach.B.Unlike scienceprogressintechnologymustbemeasuredintermsofthehuman factor.C.Whatscientistsdiscovermayshockorangerpeople—asdid Darwin’stheoryofevolution.D.Scienceandtechnologyaredifferent.E. WeareallfamiliarwiththeimproperuseoftechnologyF.Scienceisa methodofansweringtheoreticalquestions;technologyisamethodofsolving practicalproblems.
{{*HTML*}}{{B}}第三篇{{/B}} ?? RenewableEnergySources? ?Todaypetroleum石油providesaround40%oftheworld’senergyneeds mostlyfuellingautomobiles.Coalisstillusedmostlyinpowerstationsto coverone-quarterofourenergyneedsbutitistheleastefficient unhealthiestandmostenvironmentallydamagingfossilfuel矿物燃料.Naturalgas reservescouldfillsomeofthegapfromoilbutreservesofthatwillnotlast intothe22ndcenturyeither.Mostexpertspredictwewillexhausteasily accessiblereserveswithin50years.Less-pollutingrenewableenergysources offeramorepracticallong-termenergysolution.Renewablereferstothefact thattheseresourcesarenotusedfasterthantheycanbereplaced.? ?Hydroelectric水力发电的powerisnowthemostcommonformofrenewable energysupplyingaround20%ofworldelectricity.China’sThreeGorgesDamis thelargestever.AtfivetimesthesizeoftheUS’sHooverDamit’s26 turbines涡轮机willgeneratetheequivalentenergyof18coal-firedpower stations.Itwillsatisfy3%ofChina’sentireelectricitydemand.? ?In2003thefirstcommercialpowerstationtousetidal潮汐的currentsin theopenseaopenedinNorway.Itisdesignedlikewindmill风车butothers taketheformofturbines.??Aspricesfallwindpowerhasbecome thefastestgrowingtypeofelectricitygenerationquadrupling翻两番worldwide between1999and2005．Modernwindfarmsconsistofturbinesthatgenerate electricity.Thoughitwillbemoreexpensivethereismorethanenoughwindto providetheworld’sentireenergyneeds.Windfarmscomeinonshoreandoffshore forms.Theycanoftenendupatspotsofnaturalbeautyandareoftenunpopular withresidents.Andturbinesarenottotallyharmless—theycaninterferewith radaralterclimateandkillseabirds.?ScotlandisbuildingEurope’s largestwindfarmwhichwillpower200000homes.TheUK’sgoalistogenerate one-fifthofpowerfromrenewablesourcesmainlywindby2020．Butthismay causeproblemsbecausewindisunreliable.China’sThreeGorgesDam______
{{*HTML*}}??阅读下面的短文文中有15处空白每处空白给出了4个选项请根据短文的内容从4个选项中选择1个最佳答案 {{B}}??????? ??????????? ??????CostasaFactorin Supply{{/B}}??Inapurelycompetitivemarketthesupplierofgoods andserviceshasnocontroloverthemarketpricebecauseheproducestoo littletoinfluencemarketconditions.Withnodifferencebetweenhisproducts andtheproducts{{U}}?51?{{/U}}hiscompetitorshewillsellnothing ifhechargesabovethemarketpriceandhewillsellallifhechargesator{{U}} ?52?{{/U}}themarketprice.Howeverinconsideringthepricehe musttakethe{{U}}?53?{{/U}}ofproductionintoconsideration.There aretimeswhenhemaybewillingtosellbelowhiscost.Thismighthappenwhen pricestumblefor{{U}}?54?{{/U}}hebelieveswillbeashorttime. Howevernobusinesspersoncan{{U}}?55?{{/U}}tolosemoneyfora prolongedperiod.Hemustbeconstantly{{U}}?56?{{/U}}ofhiscostsin relationtothemarketpriceifheistocompetesuccessfullyandearna profit.??Manypeoplehavetheimpressionthatasproduction increasescostsperunitdecrease.{{U}}?57?{{/U}}massproductionhas madethistrueincertainindustriesandatcertainlevelsofproduction{{U}} ?58?{{/U}}logicandpracticalexperienceshaveshownthatcostsper unitbegintorisebeyondacertainlevelofproduction.Someeconomists{{U}} ?59?{{/U}}tothisprincipleasthelawofincreasingcosts.? ?Thereasoncostsriseasproductiongoesupis{{U}}?60?{{/U}}. Howeveritiseasytorecognizethatasproductiongoesuptheneedfor additionalfactorsofproductionwillalsogrow{{U}}?61 ?{{/U}}competitivebiddinginthemarketplaceforthefactorsofproduction. Ifaproducerneeds{{U}}?62?{{/U}}skilledlabortoproducemoreand noneofthislaborisunemployedtheproducerwillhavetoget{{U}}?63 ?{{/U}}fromothersources.Thiscanbedoneby{{U}}?64?{{/U}}higher wages.Higherbiddingwouldalsoapplytotheotherfactorsofproduction.We mustalsorecognizethatnotalllaborisequallyproductive{{U}}?65 ?{{/U}}notalllandisequallyfertileandnotallore矿石isequallyrich inthemineralwanted.
Whenpeoplebecomeunemployeditis{{U}}loafing{{/U}}oftenworsethanlackofwages.
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