TPO阅读44文本答案翻译

TPO-44FromFishtoTerrestrialVertebratesOneofthemostsignificantevolutionaryeventsthatoccurredonEarthwasthetransitionofwater-dwellingfishtoterrestrialtetrapods(four-limbedorganismswithbackbones).Fishprobablyoriginatedintheoceans,andourfirstrecordsofthemareinmarinerocks.However,bytheDevonianPeriod(408millionto362millionyearsago),theyhadradiatedintoalmostallavailableaquatichabitats,includingfreshwatersettings.Oneofthegroupswhosefossilsareespeciallycommoninrocksdepositedinfreshwateristhelobe-finnedfish.ThefreshwaterDevonianlobe-finnedfishrhipidistiancrossopterygianisofparticularinteresttobiologistsstudyingtetrapodevolution.Thesefishlivedinriverchannelsandlakesonlargedeltas.Thedeltarocksinwhichthesefossilsarefoundarecommonlyredduetooxidizedironminerals,indicatingthatthedeltasformedinaclimatethathadalternatewetanddryperiods.Iftherewereperiodsofdrought,anyadaptationsallowingthefishtosurvivethedryconditionswouldhavebeenadvantageous.Intheserhipidistians，severalsuchadaptationsexisted.Itisknownthattheyhadlungsaswellasgillsforbreathing.Crosssectionscutthroughsomeofthefossilsrevealthatthemudfillingtheinteriorofthecarcassdifferedinconsistencyandtexturedependingonitslocationinsidethefish.Thesedifferencessuggestasadlikecavitybelowthefrontendofthegutthatcanonlybeinterpretedasalung.Gillswereundoubtedlythemainsourceofoxygenforthesefish,butthelungsservedasanauxiliarybreathingdeviceforgulpingairwhenthewaterbecameoxygendepleted,suchasduringextendedperiodsofdrought.So,thesefishhadalreadyevolvedoneoftheprimerequisitesforlivingonland:theabilitytouseairasasourceofoxygen.Asecondadaptationofthesefishwasinthestructureofthelobefins.Thefinswerethick,fleshy,andquitesturdy,withamedianaxisofbonedownthecenter.Theycouldhavebeenusedasfeeblelocomotordevicesonland,perhapsgoodenoughtoallowafishtoflopitswayfromonepoolofwaterthatwasalmostdrytoanadjacentpondthathadenoughwaterandoxygenforsurvival.Thesefinseventuallychangedintoshort,stubbylegs.ThebonesofthefinsofaDevonianrhipidistianexactlymatchinnumberandpositionthelimbbonesoftheearliestknowntetrapods,theamphibians.Itshouldbeemphasizedthattheevolutionoflungsandlimbswasinnosenseananticipationoffuturelifeonland.Theseadaptationsdevelopedbecausetheyhelpedfishtosurviveintheirexistingaquaticenvironment.Whatecologicalpressuresmighthavecausedfishestograduallyabandontheirwateryhabitatandbecomeincreasinglyland-dwellingcreatures?ChangesinclimateduringtheDevonianmayhavehadsomethingtodowiththisiffreshwaterareasbecameprogressivelymorerestricted.Anotherimpetusmayhavebeennewsourcesoffood.Theedgesofpondsandstreamssurelyhadscattereddeadfishandotherwater-dwellingcreatures.■Inaddition,plantshademergedintoterrestrialhabitatsinareasnearstreamsandponds,andcrabsandotherarthropodswerealsomembersofthisearliestterrestrialcommunity.■Thus,bytheDevonianthelandhabitatmarginaltofreshwaterwasprobablyarichsourceofproteinthatcouldbeexploitedbyananimalthatcouldeasilyclimboutofwater.■Evidencefromteethsuggeststhattheseearliesttetrapodsdidnotutilizelandplantsasfood;theywerepresumablycarnivorousandhadnotdevelopedtheabilitytofeedonplants.■Howdidthefirsttetrapodsmakethetransitiontoaterrestrialhabitat?Likeearlylandplantssuchasrhyniophytes,theymadeonlyapartialtransition;theywerestillquitetiedtowater.However,manyproblemsthatfacedearlylandplantswerenotapplicabletothefirsttetrapods.Theancestorsoftheseanimalsalreadyhadacirculationsystem,andtheyweremobile,sothattheycouldmovetowatertodrink.Furthermore,theyalreadyhadlungs,whichrhipidistianspresumablyusedforauxiliarybreathing.Theprincipalchangesfortheearliesttetrapodswereintheskeletalsystem—changesinthebonesofthefins,thevertebralcolumn,pelvicgirdle,andpectoralgirdle.P1：OneofthemostsignificantevolutionaryeventsthatoccurredonEarthwasthetransitionofwater-dwellingfishtoterrestrialtetrapods(four-limbedorganismswithbackbones).Fishprobablyoriginatedintheoceans,andourfirstrecordsofthemareinmarinerocks.However,bytheDevonianPeriod(408millionto362millionyearsago),theyhadradiatedintoalmostallavailableaquatichabitats,includingfreshwatersettings.Oneofthegroupswhosefossilsareespeciallycommoninrocksdepositedinfreshwateristhelobe-finnedfish.1.Paragraph1supportswhichofthefollowingstatementsaboutfishevolution?A.Lobe-finnedfishwereamongtheearliesttypesoffishtoappear.B.Fishbeganlivinginfreshwaterhabitatsonlyafteroriginatingelsewhere.C.Lobe-finnedfishradiatedintoalmostallavailableaquatichabitats.D.DuringtheDevonian,lobe-finnedfishweremorecommoninmarinethaninfreshwaterhabitats.P2：ThefreshwaterDevonianlobe-finnedfishrhipidistiancrossopterygianisofparticularinteresttobiologistsstudyingtetrapodevolution.Thesefishlivedinriverchannelsandlakesonlargedeltas.Thedeltarocksinwhichthesefossilsarefoundarecommonlyredduetooxidizedironminerals,indicatingthatthedeltasformedinaclimatethathadalternatewetanddryperiods.Iftherewereperiodsofdrought,anyadaptationsallowingthefishtosurvivethedryconditionswouldhavebeenadvantageous.Intheserhipidistians，severalsuchadaptationsexisted.Itisknownthattheyhadlungsaswellasgillsforbreathing.Crosssectionscutthroughsomeofthefossilsrevealthatthemudfillingtheinteriorofthecarcassdifferedinconsistencyandtexturedependingonitslocationinsidethefish.Thesedifferencessuggestasadlikecavitybelowthefrontendofthegutthatcanonlybeinterpretedasalung.Gillswereundoubtedlythemainsourceofoxygenforthesefish,butthelungsservedasanauxiliarybreathingdeviceforgulpingairwhenthewaterbecameoxygendepleted,suchasduringextendedperiodsofdrought.So,thesefishhadalreadyevolvedoneoftheprimerequisitesforlivingonland:theabilitytouseairasasourceofoxygen.2.Accordingtoparagraph2,whatdothemineralsinthedeltarockscontainingrhipidistiancrossopterygianfossilsreveal?A.Thesedeltasformedindryperiodsbutgraduallybecamewetter.B.Thesedeltascontaindifferenttypesofironmineralsthandothesurroundingareas.C.Mostrhipidistiancrossopterygianfishdiedwhentheclimatebecamedry.D.Rhipidistiancrossopterygianfishlivedinareasthatexperiencedalternatedryandwetperiods.3.Theword"advantageous"inthepassageisclosestinmeaningtoA.beneficialB.necessaryC.remarkableD.common4.Inparagraph2,whydoestheauthorincludetheinformationthatmudinsiderhipidistiancrossopterygianfossilsdifferedinconsistencyandtexturedependingonwherethemudwaslocated?A.Toprovideevidencethatrhipidistiancrossopterygianlivedinriverchannelsandlakesonlargedeltas.B.Toidentifyaneffectoftheoxidationofironmineralsontheevolutionofrhipidistiancrossopterygian.C.Tohelpexplainwhyscientistshaveconcludedthatrhipidistiancrossopterygianprobablyhadlungs.D.Toexplainwhyscientistsdecidedtocutcrosssectionsthroughsomefossilsofrhipidistiancrossopterygian.5.Whichofthesentencesbelowbestexpressestheessentialinformationinthehighlightedsentenceinthepassage?Incorrectchoiceschangethemeaninginimportantwaysorleaveoutessentialinformation.A.Becausethelungsofthesefishwereabletoprovideonlyasmallamountofoxygen,thesefishobtainedmostoftheiroxygenthroughtheirgillsduringperiodsofdrought.B.Duringperiodsofextendeddrought,thesefishusedtheirlungstoincreasetheirintakeofoxygenbeyondthelevelsabsorbedbythegillsinnormaltimes.C.Althoughthesefishprimarilyusedtheirgillstoobtainoxygen,theyusedtheirlungstoobtainoxygenfromtheairwhentherewasnotenoughinthewater.D.Duringperiodsofextendeddrought,thegillsbecameanauxiliarybreathingdeviceandthelungsbecamethemainsourceofoxygenforthesefish.6.Whichofthesentencesbelowbestexpressestheessentialinformationinthehighlightedsentenceinthepassage?Incorrectchoiceschangethemeaninginimportantwaysorleaveoutessentialinformation.A.Becausethelungsofthesefishwereabletoprovideonlyasmallamountofoxygen,thesefishobtainedmostoftheiroxygenthroughtheirgillsduringperiodsofdrought.B.Duringperiodsofextendeddrought,thesefishusedtheirlungstoincreasetheirintakeofoxygenbeyondthelevelsabsorbedbythegillsinnormaltimes.C.Althoughthesefishprimarilyusedtheirgillstoobtainoxygen,theyusedtheirlungstoobtainoxygenfromtheairwhentherewasnotenoughinthewater.D.Duringperiodsofextendeddrought,thegillsbecameanauxiliarybreathingdeviceandthelungsbecamethemainsourceofoxygenforthesefish.P3：Asecondadaptationofthesefishwasinthestructureofthelobefins.Thefinswerethick,fleshy,andquitesturdy,withamedianaxisofbonedownthecenter.Theycouldhavebeenusedasfeeblelocomotordevicesonland,perhapsgoodenoughtoallowafishtoflopitswayfromonepoolofwaterthatwasalmostdrytoanadjacentpondthathadenoughwaterandoxygenforsurvival.Thesefinseventuallychangedintoshort,stubbylegs.ThebonesofthefinsofaDevonianrhipidistianexactlymatchinnumberandpositionthelimbbonesoftheearliestknowntetrapods,theamphibians.Itshouldbeemphasizedthattheevolutionoflungsandlimbswasinnosenseananticipationoffuturelifeonland.Theseadaptationsdevelopedbecausetheyhelpedfishtosurviveintheirexistingaquaticenvironment.Toomanywordsyoudon’tknow?Lookthemupin《新托福TPO阅读词汇速查速记》!Wechat:geeqi08057.Theword"adjacent"inthepassageisclosestinmeaningto:A.nearbyB.availableC.temporaryD.freshYouenjoytheconvenienceofhavingallvocabularyquestionslistedasaseparatepartin《新托福TPO阅读词汇速查速记》.P4：Whatecologicalpressuresmighthavecausedfishestograduallyabandontheirwateryhabitatandbecomeincreasinglyland-dwellingcreatures?ChangesinclimateduringtheDevonianmayhavehadsomethingtodowiththisiffreshwaterareasbecameprogressivelymorerestricted.Anotherimpetusmayhavebeennewsourcesoffood.Theedgesofpondsandstreamssurelyhadscattereddeadfishandotherwater-dwellingcreatures.■Inaddition,plantshademergedintoterrestrialhabitatsinareasnearstreamsandponds,andcrabsandotherarthropodswerealsomembersofthisearliestterrestrialcommunity.■Thus,bytheDevonianthelandhabitatmarginaltofreshwaterwasprobablyarichsourceofproteinthatcouldbeexploitedbyananimalthatcouldeasilyclimboutofwater.■Evidencefromteethsuggeststhattheseearliesttetrapodsdidnotutilizelandplantsasfood;theywerepresumablycarnivorousandhadnotdevelopedtheabilitytofeedonplants.■8.Theword“progressively”inthepassageisclosestinmeaningto:A.increasinglyB.noticeablyC.occasionallyD.rapidly9.Inparagraph4,whydoestheauthorpointoutthatcrabsandotherarthropodswerealreadylivingonlandwhentheancestorsofthefirsttetrapodsbeganlivingthere?A.ToaccountforthepresenceofdeadfishalongtheedgesofpondsandstreamsduringtheDevonian.B.TosupporttheclaimthatclimatechangecausedfreshwaterhabitatstobecomemorerestrictedduringtheDevonian.C.Toidentifyaconsequenceoftheemergenceofplantsintoterrestrialhabitatsnearpondsandstreams.D.Toidentifyapossiblereasonforwhycertainfishgraduallybecameterrestrialorganisms.10.Accordingtoparagraph4，teethoftheearliesttetrapodssuggestthatthesetetrapodsA.competedwithotheranimalsforproteinB.wereprobablycarnivoresC.couldeasilyclimboutofwaterD.wereabletoeatplantsP5：Howdidthefirsttetrapodsmakethetransitiontoaterrestrialhabitat?Likeearlylandplantssuchasrhyniophytes,theymadeonlyapartialtransition;theywerestillquitetiedtowater.However,manyproblemsthatfacedearlylandplantswerenotapplicabletothefirsttetrapods.Theancestorsoftheseanimalsalreadyhadacirculationsystem,andtheyweremobile,sothattheycouldmovetowatertodrink.Furthermore,theyalreadyhadlungs,whichrhipidistianspresumablyusedforauxiliarybreathing.Theprincipalchangesfortheearliesttetrapodswereintheskeletalsystem—changesinthebonesofthefins,thevertebralcolumn,pelvicgirdle,andpectoralgirdle.11.Accordingtoparagraph5,whichofthefollowingwastrueofthefirsttetrapods?A.Theybecamedependentforfoodonorganismsalreadylivingonland.B.Theyneededtodevelopnewmechanismsforobtainingnutrients.C.Theycontinuedtoliveincloseassociationwithaquaticenvironments.D.Theywereevolutionarilyfarremovedfromtheirrhipidistianancestors.12.Accordingtoparagraph5,whatwasthemainwaythattheearliesttetrapodsdifferedfromtheirimmediatefishancestors?A.Thetetrapodshadadifferentskeletalstructure.B.ThetetrapodshadmoresourcesoffoodavailableC.Thetetrapodshadacirculationsystem.D.Thetetrapodscouldmovetonewpoolsofwater.P4：Whatecologicalpressuresmighthavecausedfishestograduallyabandontheirwateryhabitatandbecomeincreasinglyland-dwellingcreatures?ChangesinclimateduringtheDevonianmayhavehadsomethingtodowiththisiffreshwaterareasbecameprogressivelymorerestricted.Anotherimpetusmayhavebeennewsourcesoffood.Theedgesofpondsandstreamssurelyhadscattereddeadfishandotherwater-dwellingcreatures.■Inaddition,plantshademergedintoterrestrialhabitatsinareasnearstreamsandponds,andcrabsandotherarthropodswerealsomembersofthisearliestterrestrialcommunity.■Thus,bytheDevonianthelandhabitatmarginaltofreshwaterwasprobablyarichsourceofproteinthatcouldbeexploitedbyananimalthatcouldeasilyclimboutofwater.■Evidencefromteethsuggeststhattheseearliesttetrapodsdidnotutilizelandplantsasfood;theywerepresumablycarnivorousandhadnotdevelopedtheabilitytofeedonplants.■13.Lookatthefoursquares[■]thatindicatewherethefollowingsentencecouldbeaddedtothepassage.Thesewouldhavebeendepositedbytherecedingwatersofdroughts,duringwhichmanyaquaticanimalsmusthavedied.Wherewouldthesentencebestfit?Clickonasquare[■]toaddthesentencetothepassage14.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.Thisquestionisworth2points.Freshwaterlobe-finnedfishmaybethedirectancestorsofterrestrialtetrapods.●●●AnswerChoicesA.Rhipidistiancrossopterygianhadfeaturessuchasprimitivelungsandthickfinsthatcouldhavehelpeditsurvivedryperiods.B.DuringtheDevonian,thenumberofbonesincreasedinthefinsofrtiipidistians,improvingsuchanimals’abilitytoswimandmoveoverlandC.Shortlyaftertheearliesttetrapodsdevelopedlungs,plantsandotheranimalsbegantoflourishonland.D.BytheDevonianperiod,lobe-finnedfishpreferredfreshwaterhabitatstolifeintheocean.E.Adrierclimateandnewsourcesoffoodonlandmayhaveencouragedthelobe-finnedfish’smovetoaterrestrialexistence.F.Earlytetrapodsremainedcloselyconnectedtowater,butseveraloftheirbodystructureswereadaptedforlifeonland.参考 答案 八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案 ：1-5.BDACC6-10.DAADB11-13.CAA14.AEFIfyouhaveanyquestionsconcerningthetextsoranswers,feelfreetocontactWechat:geeqi0805.IfyouaretiredoflookingupTPOwordsinadictionary,try《新托福TPO阅读词汇速查速记》!参考译文：从鱼类到陆生脊椎动物水中栖息的鱼类进化为陆地四足动物（有脊椎的四肢生物）是地球上发生过的重大进化事件之一。鱼类很可能起源于海洋，有关鱼类的最早 记录 混凝土 养护记录下载土方回填监理旁站记录免费下载集备记录下载集备记录下载集备记录下载 是在海洋岩石中。然而，到了泥盆纪（4.08亿至3.62亿年前），鱼类的栖息地已经扩展到几乎所有可能的水生环境，包括淡水水域。淡水沉积岩石中十分常见的是一种叶状鳍鱼化石。研究四足动物进化的生物学家对泥盆纪时期生活在淡水水域的总鳍鱼纲、扇鳍鱼目叶状鳍鱼尤其感兴趣。这种鱼生活在大型三角洲的河道和湖泊里。它们的化石常见于三角洲岩石中，这类岩石因为含有氧化铁矿物，故而呈红色，这也表明三角洲形成时已经有干湿季节的交替。如果有干旱期存在，任何有助于鱼类度过干旱的进化都会是有利的。这些扇鳍鱼身上也出现了几处这样的进化。我们知道扇鳍鱼的呼吸器官除了鳃还有肺。一些化石的横截面显示，扇鳍鱼尸体内的泥的稠度和质地根据其在体内位置的不同而不同。这些差异表明在鱼肠前端下面像腔一样的东西只可能是肺。鳃无疑是这些鱼的主要氧气来源，但当水中含氧量大幅减少时，比如在长期干旱的情况下，肺就会作为辅助呼吸系统来吸气。可见，这些鱼已经进化出陆地生存的必备条件之一：将空气作为氧气来源的能力。这些鱼的另一个适应是在叶状的鳍。这些鳍很厚、很有肉质感、而且十分结实，内有一条轴心骨。在陆地上鱼鳍从一定程度上可以作为运动的装置，或许能使鱼为了生存从几近干涸的池塘挪动到相邻的有足够水和氧气的池塘。这些鳍最终进化成了短而健壮的腿。泥盆纪扇鳍鱼的鳍骨在数量和位置上与已知的最早的四足动物的肢骨完全匹配。应该强调的是，肺和四肢的进化并不是因为它们预料到未来要在陆地上生活。这些适应是为了帮助它们在当时的水生环境中存活下来。《新托福TPO阅读词汇速查速记》，配合TPO使用，带你高效做 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 ＋背单词。Wechat:geeqi0805是什么样的生态压力导致鱼类逐渐放弃在水中的栖息地，逐渐成为陆生生物呢？如果淡水区域逐步缩减，泥盆纪的气候变化可能与此相关。另一个动力可能是新的食物来源。池塘和溪流的边缘无疑会散落有死掉的鱼和其他水栖生物。此外，溪流与池塘附近的陆地开始有植物出现，蟹和其他节肢动物也加入了这一最早的陆地群落。因此，在泥盆纪时期，对于能够轻易爬出水面的生物，淡水边缘的陆地很可能是丰富的蛋白质食物来源。对四足动物的牙齿的研究表明，最早的四足动物并不食用陆生植物；它们可能是食肉动物，而且也尚未形成食用植物的能力。第一批四足动物是怎样向陆地环境过渡的呢？就像早期的陆生植物莱尼蕨类一样，这些四足动物只是产生了部分变化，这个阶段，它们仍然很依赖于水。不过，早期陆生植物面临的许多问题并不会困扰到它们。这些动物从祖先起就已经有了一个流通系统，它们可以移动，所以可以挪到水边饮水。另外，它们已经有肺了，当时扇鳍鱼可能都已经将其用于辅助呼吸了。最早期的四足动物主要进化的是骨骼系统，即鳍骨、脊柱、骨盆、肩胛骨发生变化。TheUseoftheCameraObscuraTheprecursorofthemoderncamera,thecameraobscuraisadarkenedenclosureintowhichlightisadmittedthroughalensinasmallhole.Theimageoftheilluminatedareaoutsidetheenclosureisthrownupsidedownasifbymagicontoasurfaceinthedarkenedenclosure.ThistechniquewasknownaslongagoasthefifthcenturyB.C.inChina.AristotlealsoexperimentedwithitinthefourthcenturyB.C.,andLeonardodaVincidescribeditinhisnotebooksin1490.In1558GiovanniBattistaDellaPortawroteinhistwenty-volumeworkMagianaturalis(meaning"naturalmagic")instructionsforaddingaconvexlenstoimprovethequalityoftheimagethrownagainstacanvasorpanelinthedarkenedareawhereitsoutlinescouldbetraced.■Later,portablecameraobscurasweredeveloped,withinteriormirrorsanddrawingtablesonwhichtheartistcouldtracetheimage.■Fortheartist,thistechniqueallowsformsandlinearperspectivetobedrawnpreciselyastheywouldbeseenfromasingleviewpoint.■Mirrorswerealsousedtoreversetheprojectedimagestotheiroriginalpositions.■Didsomeofthegreatmastersofpainting,then,tracetheirimagesusingacameraobscura?Somearthistoriansarenowlookingforcluesofartists'useofsuchdevices.OneoftheartistswhosepaintingsarebeinganalyzedfromthispointofviewisthegreatDutchmaster,JanVermeer,wholivedfrom1632to1675duringthefloweringofartandscienceintheNetherlands,includingthescienceofoptics.Vermeerproducedonlyabout30knownpaintings,includinghisfamousTheArtofPainting.TheroomshowninitcloselyresemblestheroominotherVermeerpaintings,withlightingcomingfromawindowontheleft,thesameroofbeams,andsimilarfloortiles,suggestingthattheroomwasfittedwithacameraobscuraonthesideintheforeground.ThemaphungontheoppositewallwasarealmapinVermeerspossession,reproducedinsuchfaithfuldetailthatsomekindoftraceryissuspected.WhenoneofVermeer’spaintingswasX-rayed,itdidnothaveanypreliminarysketchesonthecanvasbeneaththepaint,butratherthecompleteimagedrawninblackandwhitewithoutanytrialsketches.Vermeerdidnothaveanystudents,didnotkeepanyrecords,anddidnotencourageanyonetovisithisstudio,factsthatcanbeinterpretedasprotectinghissecretuseofacameraobscura.InrecenttimestheBritishartistDavidHockneyhaspublishedhisinvestigationsintothesecretuseofthecameraobscura,claimingthatforupto400years,manyofWesternart’sgreatmastersprobablyusedthedevicetoproducealmostphotographicallyrealisticdetailsintheirpaintings.HeincludesinthisgroupCaravaggio,HansHolbein,LeonardodaVinci,DiegoVelazquez,Jean-Auguste-DominiqueIngres,AgnoloBronzino,andJanvanEyck.Fromanartist’spointofview,Hockneyobservedthatacameraobscuracompressesthecomplicatedformsofathree-dimensionalsceneintotwo-dimensionalshapesthatcaneasilybetracedandalsoincreasesthecontrastbetweenlightanddark,leadingtothechiaroscuroeffectseeninmanyofthesepaintings.InJanvanEyck’sTheMarriageofGiovanniArnolfiniandGiovannaCenami,thecomplicatedforeshorteninginthechandelierandtheintricatedetailinthebride’sgarmentsareamongthecluesthatHockneythinkspointtotheuseofthecameraobscura.Sowhatarewetoconclude?Iftheseartistsdiduseacameraobscura,doesthatdiminishtheirstature?Hockneyarguesthatthecameraobscuradoesnotreplaceartisticskillindrawingandpainting.Inexperimentingwithit,hefoundthatitisactuallyquitedifficulttousefordrawing,andhespeculatesthattheartistsprobablycombinedtheirobservationsfromlifewithtracingofshapes.:P1：Theprecursorofthemoderncamera,thecameraobscuraisadarkenedenclosureintowhichlightisadmittedthroughalensinasmallhole.Theimageoftheilluminatedareaoutsidetheenclosureisthrownupsidedownasifbymagicontoasurfaceinthedarkenedenclosure.ThistechniquewasknownaslongagoasthefifthcenturyB.C.inChina.AristotlealsoexperimentedwithitinthefourthcenturyB.C.,andLeonardodaVincidescribeditinhisnotebooksin1490.In1558GiovanniBattistaDellaPortawroteinhistwenty-volumeworkMagianaturalis(meaning"naturalmagic")instructionsforaddingaconvexlenstoimprovethequalityoftheimagethrownagainstacanvasorpanelinthedarkenedareawhereitsoutlinescouldbetraced.■Later,portablecameraobscurasweredeveloped,withinteriormirrorsanddrawingtablesonwhichtheartistcouldtracetheimage.■Fortheartist,thistechniqueallowsformsandlinearperspectivetobedrawnpreciselyastheywouldbeseenfromasingleviewpoint.■Mirrorswerealsousedtoreversetheprojectedimagestotheiroriginalpositions.■1.Whatcanbeinferredfromparagraph1aboutGiovanniBattistaDellaPorta'scontributiontothecameraobscura?A.HetranslatedaChinesedescriptionoftheuseofthecameraobscuraandmadethetechniqueavailabletoartists.B.Hisconvexlensmadetheprojectedimageeasiertotrace.C.Hisversionofthecameraobscuraallowedforthelateradditionofamirror.D.HisimprovementsreliedheavilyondesignchangesproposedearlierbyLeonardodaVinci.2.Theword“portable”inthepassageisclosestinmeaningtoA.valuableB.practicalC.moveableD.popular3.Theword"projected"inthepassageisclosestinmeaningtoA.wholeB.correctedC.enlargedD.shown:P2：Didsomeofthegreatmastersofpainting,then,tracetheirimagesusingacameraobscura?Somearthistoriansarenowlookingforcluesofartists'useofsuchdevices.Oneoftheartist