职称英语-职称英语理工类c级模拟39

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ᳮC391ᑖ⌱⚗1ஹTheForbiddenCityluresmillionsofvisitorsfromallovertheworld.A.attractsB.entertainsC.receivesD.serves2ஹHerpeerswereherworstcritics.A.studentsB.equalsC.teachersD.subordinates3ஹItisnousedebatingtherelativemeritsofthispolicy.A.makingB.takingC.discussingD.expecting4ஹWhileservingintheSenateintheearly1970sBarbaraJordansupportedlegislationtobandiscriminationandtodealwithenvironmentproblems.A.listB.forbidC.handleD.investigate5ஹSheshowslittleregardforthefeelingsofothersanddoesexactlywhatshewantsto.A.feelingB.loveC.considerationD.sense6ஹHeisinaratherdifficultsituationatpresent.A.locationB.positionC.preparationD.station7ஹThesisterscan*ttolerateeachother.A.bearB.hateC.likeD.criticize8ஹAt90,manyindividualsstillremainhealthyandenergetic.A.intelligentB.roughC.robustD.revivable9ஹJackisadiligentworker.A.ambitiousB.lazyC.hardworkingD.clever10ஹShewasclosetosuccess.A.fastB.quickC.nearD.tight11>CementwasseldomusedinbuildingduringtheMiddleAges.A.crudelyB.rarelyC.originallyD.symbolically12ஹShegaveupherjobtolookafterherinvalidmother.A.quittedB.lostC.pausedDretired13ஹYoucanturntodifferentkindsofpeople,dictionariesormapstofindzoutwhatyouwishtoknow.A.contactB.consultC.referD.request14ஹHewasaverysmartboybuthemadeafoolishdecisionthistime.A.cleverB.sillyC.braveD.shy

115>MarxismdoctrinewasspelledoutintheCommunistManifesto.A.evaluatedB.detailedC.supportedD.mentioned2ᑖ▅ᑨBeesandColourOnourtableinthegardenweputabluecard,andallaroundthisbluecardweputanumberofdifferentgreycards.Thesegreycardsareofallpossibleshadesofgreyandincludewhiteandblack.Oneachcardawatch-glassisplaced.Thewatch-glassonthebluecardhassomesyrupinitallztheothersareempty.Afterashorttimebeesfindthesyrup,andtheycomeforitagainandagain.Then,aftersomehours,wetakeawaythewatch-glassofsyrupwhichwasonthebluecardandputanemptyoneinitsplace.Nowwhatdothebeesdo?Theystillgostraighttothebluecard,althoughthereisnosyrupthere.Theydonotgotoanyofthegreycards,inspiteofthefactthatoneofthegreycardsisofexactlythesamebrightnessasthebluecard.Thusthebeesdonotmistakeanyshadeofgreyforblue.Inthiswaywehaveprovedthattheydoreallyseeblueasacolour.Wecanfindoutinjustthesamewaywhatothercoloursbeescansee.Itturnsoutthatbeescanseevariouscolours,buttheseinsectsdifferfromusasregardstheircolour-senseintwoveryinterestingways.Supposewetrainbeestocometoaredcard,and,havingdoneso,weputtheredcardonthetableinthegardenamongthesetofdifferentgreycards.Thistimewefindthatthebeesmistakeredfordarkgreyorblack.Theycannotdistinguishbetweenthem.Thismeansthatredisnotacotouratallforbeesforthemitisjustdarkgreyorblack.Thatisonestrangefacthereisanother.Arainbowisredononeedge,violetontheother.Outsidethevioletoftherainbowthereisanothercolourwhichwecannotseeatall.Thiscolourbeyondtheviolet,invisibletous,iscalledtheultra-violet.Althoughitisinvisible,weknowthattheultra-violetistherebecauseitaffectsaphotographicplate.Now,althoughweareunabletoseeultra-violetlight,beescandosoforthemultra-violetisacolour.Thusbeesseeacolourwhichwecannotevenimagine.Thishasbeenfoundoutbytrainingbeestocomeforsyruptovariouspartsofaspectrum,orartificialrainbow,thrownbyaprismonatableinadarkroom.Insuchanexperimenttheinsectscanbetaughttoflytotheultra-violetwhichzforusisjustdarkness.16>Theexperimentwithbeesdescribedinthefirstandsecondparagraphstellusthatbeesregardblueasacolour.A.RightB.WrongC.Notmentioned17>Thethirdparagraphtellsusthatbeesalsoregardredasacolour.A.RightB.WrongC.Notmentioned18>Theexperimentdescribedinthesecondparagraphaimedtofindoutthatbeesarenotabletoseegreyasacolour.A.RightB.WrongC.Notmentioned19>Anartificialrainbowwascreatedfortheexperimenttoseewhetherbeescanrecognizetheultra-violetasacolour.A.RightB.WrongC.Notmentioned20ஹThefourthparagraphtellsusthatbeesmaybeharmedbyultra-violetlight.A.RightB.WrongC.Notmentioned21ஹWecanconcludefromthepassagethatbeesrecognizecoloursinthesamewayashumanbeings.A.RightB.WrongC.Notmentioned22ஹBeesaremoresensitivetocoloursthanhumanbeings.A.RightB.WrongC.Notmentioned3ᑖᭆᜧ!"ᡂ$%KeepingCutFlowers

21.Whileeverybodyenjoysfreshcutflowersaroundhishouse,fewpeopleknowhowtokeepthemforaslongaspossible.Thismaybedonebykeepinginmindafewsimplefacts.2.Animportantthingtorememberaboutcutflowersisthattheyaresensitivetotemperature.Forexample,studieshaveshownthatcutcarnations&'(retaintheirfreshnesseighttimeslongerwhenkeptat12࠷thanwhenkeptat26࠷.Keepingfreshlyharvestedflowersattherighttemperaturesisprobablythemostimportantaspectofflowercare.3.Flowersarenotintendedbynaturetoliveverylong.Theirbiologicalpurposeissimplytoattractbirdsorinsects,suchasbees,forpollinationᣴ+.Afterthat,theyquicklydryupanddie.Theprocessbywhichflowersconsumeoxygenandproducecarbondioxide-.ᓄ01calledrespiration2ᔾ,generatestheenergytheflowerneedstogivethefloweritsshapeandcolor.Themakingofseedsalsodependsonthisenergy.Whilealllivingthingsrespireflowershaveahighlevelofrespiration.Aresultofallthiszrespirationisheat,andforflowersthelevelofheatrelativetothemassoftheflowerisveryhigh.Respirationalsobringsabouttheeventualdeathoftheflower.Thusthegreaterthelevelofrespiration,thesoonertheflowerdies.4.Thenhowtocontroltherateatwhichflowersdie?Bycontrollingrespiration.Howisrespirationcontrolled?Bycontrollingtemperature.Weknowthatrespirationproducesheat,butthereverse56Ḅ89isalsotrue.Thusbymaintaininglowtemperatures,respirationisreducedandthecutflowerwillagemoreslowly.5.Anothervitalfactorinkeepingcutflowersisthequalityofthewaterinwhichtheyareplaced.Flowersfinditdifficulttondrink"waterthatisdirtyorotherwisepolluted.Evenwhenwaterlooksandsmellsclean,italmostcertainlycontainsharmfulsubstancesthatcanendangertheflowers.Toridthewateroftheseunwantedsubstanceshouseholdchlorinebleach:z;<=ᑺcanbeusedinsmallquantities.Itisrecommendedthat15dropsofchlorinebleachat4%solution
beaddedtoeachliterofwater.Thewaterandsolutionshouldalsobereplacedeachday.A.ControlofRespirationB.BeautyofFreshCutFlowersC.RoleofRespirationD.MostImportantAspectofFlowerCareE.NeedforCleanWaterF.WaysofStoppingRespiration23ஹParagraph2_______24ஹParagraph3_______25ஹParagraph4_______26ஹParagraph5_______TheSupercomputerNetwork1Recently,tenlaboratoriesrunbygovernmentsindifferentpartsoftheworldhavebecomelinked.Theircomputershavebeenconnectedsotheycan"talk"toeachother.Thismaynotseemverydramaticnews,butitIsthebeginningofadevelopmentthatwillIncreasethepoweroftheInternettremendously.2TheInternetIsanInterconnected?ὶsystemofnetworksthatconnectscomputersroundtheworldandfacilitatesthetransmissionandexchangeofinformation.ThewaythatyouusetheInternetisbyaccessingthisnetwork.Thisdependsonthepowerthatyoursystemallowsyoutouse.ThepowerofyourcomputerisresponsibleforhowfastyoucandownloadABfiles,howmuchdatayoucanstore,etc.Ifyourcomputerisoldandslow,accessingtheinformationcanbeverydifficult.3Thenewdevelopmentininformationtechnologyhasbeencalled"thegrid"CDᢈF1anditwillbeanetworkofcomputersthatarelinkedtogether.The"grid"willworkinadifferentwayfromtheInternet,enablingyoutogetthepowerofthebiggestcomputersintheworldonyourcomputer.Accessing

3theinformationwillnolongerdependonthepowerofyourcomputer.Theideaisthatwhileyouaccessinformation,youwillalsohaveaccesstothepowerofthebiggercomputerstations.4Oneadvantageofthisrevolutionaryideaisthatgeographicallocationwillbecomeirrelevant.The"grid"willdecidewhicharethebestpartsofaworldwidenetworktodothejobyouwant.ThismeansthatyoumaybeaccessingacomputerinJapantosolveaprobleminAlaska.5The"grid"canbecomparedtohavinganefficientpersonalassistant.Youcangiveyourassistantataskand"henwilldoitforyou.Theassistantwilldothepreliminaryresearch,collectthedata,comparethemanddecideonthebestcourseofactionbyaccessinganyofthecomputercentresinthe"grid**thathappentohavetherelevantinformation.Allyouhavetodoisassignthetask,sitbackandwait.6Atpresent,possibleapplicationsofthe"grid"inscientificresearcharebeingexploredWhileIthastakenaboutfifteenyearsforInternetusetobecomewidespread,expertsbelievethatthe"grid"couldbeupandrunningforprivateindividualsfarmorequickly.Scientistsworkingon"grid"projectsareconvincedthatitwillbeaswidelyusedasthewebinthenexttenyears.27ஹParagraph2AHowdoesthe"grid"work?BPowersharedCJustmakearequestDLimitationsofpresentInternetuseEDistanceisnotaproblemFAnewerefortheInternet28>Paragraph329ஹParagraph430ஹParagraph5AthebiggercomputerstationsBtheadvantageCtenyearsDinformationEyourpersonalassistantFfifteenyears31>Traditionallythepowerofyourcomputerdetermineshowfastyoucanaccess32>The"grid"willenableyoutogetonyourcomputerthepowerofintheworld.33ஹThe"grid"wouldbelike,whocanperformyourtasksefficiently.34ஹItIsbelievedthatthewidespreaduseofthe"grid"willbecomepossibleinthenext.4ᑖ▅ᳮGHIZlTtJDoubtsandDebatesovertheWorthofMBABillGatesthebillionaireMicrosoftchairmanwithoutasingleearnedzuniversitydegree,isbyhissuccessraisingnewdoubtsabouttheworthofthebusinessworld1sfavoriteacademictitletheMBA(MasterofBusinessAdministration).TheMBA,a20th-centuryproductalwayshasbornethemarkoflowlycommerceandgreed(KL)onthetree-linedcampusesruledbypurerdisciplinessuchasphilosophyandliterature.Butevenwiththerecessionapparentlycuttingintothehiringofbusinessschoolgraduates,about79,000peopleareexpectedtoreceiveMBAsin1993.Thisisnearly16timesthenumberofbusinessgraduatesin1960,atestimonytothewidespreadassumptionthattheMBAisvitalforyoungmenandwomenwhowanttoruncompaniessomeday."IfyouaregoingintothecorporateworlditisstilladisadvantagenottohaveonensaidzDonaldMorrison,professorofmarketingandmanagementscience."Butinthelastfiveyearsorso,whensomeonesays1ShouldIattempttogetanMBA,,z

4theansweralotmoreisItdepends.nThesuccessofBillGatesandothernon-MBAs,suchasthelateSamWaltonofWal-MartStoresInc.hashelpedinspireself-consciousdebatesonbusinessschoolcampusesovertheworthofabusinessdegreeandwhethermanagementskillscanbetaught.TheHarvardBusinessReviewprintedalively,fictionalexchangeofletterstodramatizecomplaintsaboutbusinessdegreeholders.ThearticlecalledMBAhires"extremelydisappointingnandsaid"MBAswantstomoveuptoofast,theydon11understandpoliticsandpeople,andtheyaren11abletofunctionaspartofateamuntiltheirthirdyear.Butbythen,they*reoutlookingforotherjobs."Theproblem,mostparticipantsinthedebateacknowledge,isthattheMBAhasacquiredanauraᐝOoffuturerichesandpowerforbeyonditsactualimportanceandusefulness.Enrollmentinbusinessschoolsexplodedinthe1970sand1980sandcreatedtheassumptionthatnoonewhopursuedabusinesscareercoulddowithoutone.Thegrowthwasfueledbyabacklash6Pagainsttheanti-businessvaluesofthe1960sandbythewomen*smovement.BusinesspeoplewhohavehiredorworkedwithMBAssaythosewiththedegreesoftenknowhowtoanalyzesystemsbutarenotsoskillfulatmotivatingpeople."Theydon11getalotofgroundinginthepeoplesideofthebusiness,'*saidJamesShaffer,vicepresidentandprincipaloftheTowersPerrinmanagementconsultingfirm.35ஹAccordingtoParagraph2whatisthegeneralattitudetowardsbusinesszoncampusesdominatedbypurerdisciplines?A.Envious.B.Scornful.C.Realistic.D.Appreciative.36>ItseemsthatthecontroversyoverthevaluesofMBAdegreeshasbeenfueledmainlyby_______.A.thesuccessofmanynonMBAsB.thecomplaintsfromvariousemployersC.theperformanceofMBAsatworkD.thecriticismfromthescientistsofpurerdisciplines37ஹWhatisthemajorweaknessofMBAholdersaccordingtoTheHarvardBusinessReview?A.Theyarenotgoodatdealingwithpeople.B.Theykeepcomplainingabouttheirjobs.C.Theyareusuallyselfcentered.D.Theyareaggressiveandgreedy.38ஹFromthepassageweknowthatmostMBAs.A.canclimbthecorporateladderfairlyquicklyB.cherishunrealisticexpectationsabouttheirfutureC.quittheirjobsoncetheyarefamiliarwiththeirworkmatesD.receivesalariesthatdonotmatchtheirprofessionaltraining39ஹWhatisthepassagemainlyabout?A.Adebateheldrecentlyonuniversitycampuses.B.DoubtsabouttheworthofholdinganMBAdegree.C.WhythereisanincreasedenrollmentinMBAprogrammes.D.ThenecessityofreformingMBAprogramsinbusinessschools.QH^ᡡOceanographyOceanographyhasbeendefinedas"theapplicationofallsciencestothestudyofthesea."Beforethenineteenthcentury,scientistswithaninterestintheseawerefew.CertainlyNewtonconsideredsometheoreticalaspectsofitinhiswritings,buthewasreluctanttogotoseatofartherhiswork.Formostpeopletheseawasremote,andwiththeexceptionofearlyintercontinentalᜧ▮UḄ
travelersorotherswhoearnedalivingfromthesea,therewaslittlereasontoaskmanyquestionsaboutitletalonetozaskwhatlaybeneaththesurface.Thefirsttimethatthequestion-Hwhatisatthebottomoftheoceans?"hadtobeansweredwithanycommercialconsequence

5waswhenthelayingofatelegraphcablefromEuropetoAmericawasproposed.TheengineershadtoknowthedepthprofileVWXYoftheroutetoestimatethelengthofcablethathadtobemanufactured.ItwastoMauryoftheLISNavythattheAtlanticTelegraphCompanyturned,in1853,forinformationonthismatter.Inthe1840s,MauryhadbeenresponsibleforencouragingvoyagesduringwhichsoundingsZ[\weretakentoinvestigatethedepthsoftheNorthAtlanticandPacificOceans.Later,someofhisfindingsarousedmuch,popularinterestinhisbook"ThePhysicalGeographyoftheSea".Thecablewaslaid,butnotuntil1866wastheconnectionmadepermanentandreliable.Attheearlyattemptsthecablefailedandwhenitwastakenzoutforrepairingitwasfoundtobecoveredwithlivingcreatures,afactwhichdefiedcontemporaryscientificopinionthattherewasnolifeinthedeeperpartsofthesea.Withinafewyearsoceanographywasunderway.In1872,Thomsonledascientificexpeditionὃ^,whichlastedforfouryearsandbroughthomethousandsofsamplesfromthesea.Theirclassificationandanalysisoccupiedscientistsforyearsandledtoafive-volumereport,thelastvolumebeingpublishedin1895.40ஹWecaninferfromthepassagethatthetelegraphcablewasbuiltmainlyfor.A.oceanographicstudiesB.militarypurposesC.businessconsiderationsD.investigatingthedepthsoftheoceans41ஹTheaimofvoyagesMauryencouragedinthe1840swas.A.tomakesomesoundexperimentsintheoceansB.tocollectsamplesofseaplantsandanimalsC.toestimatethelengthofcablethatwastobemadeD.tomeasurethedepthsoftwooceans42ஹItwasthataskedMauryforhelpinoceanographicstudies.A.theAmericanNavyB.someearlyintercontinentaltravelersC.thosewhoearnedalivingfromtheseaD.thecompanywhichproposedtolayanunderseacable43ஹ11defied"intheparagraph5probablymeans.A.doubtedB.challengedC.gaveprooftoD.agreedto44ஹThispassageismainlyabout.A.thebeginningsofoceanographyB.thelayingofthefirstunderseacableC.theinvestigationofoceandepthsD.theearlyintercontinentalcommunicationsBirdsongAmalezebrafinchchirpsawaytohimself.Suddenlyhenoticesafemalebirdnearby.Herealizeshehasanaudienceandimmediatelychangeshissong.Canthefemaletellthedifferenceinhisperformance?Accordingtoanewstudy,thefemalezebrafinchknows.Andsheprefersthespecialtrillshecreateswhenhesingstoher.Amalezebrafinchchangeshissongwhensingingtoafemaleinwaysthatpeoplecanbarelydetect.Butthefemalefinchcantellthedifference.Scientistshadnoticedslightvariationsinthesongsofmalezebrafinchesbasedonwhethertheyweresingingaloneorwhethertherewasafemaleandpotentialmate
nearby.Withanaudience,themalesspedupthepaceoftheirsongsandcontrolledthenotestheyused.Forthisstudy,researchersSarahC.WoolleyandAllisonDoupeattheUniversityofCalifornia,SanFranciscodecidedtofocusattentiononthelisteningfemaleswhichhavenotbeenwellstudiedinthepast.z

6Inthestudy,WoolleyandDoupesetup,alongcagewithasoundspeakerateachend.Onebroadcastthesoundofamalezebrafinchsingingtohimselfzlikesomeonesingingintheshower.Theotherspeakerbroadcastamaleperformingforafemaleaudience,asifhewasgivingaconcert.Femalebirdswereplacedbetweenthetwospeakers.Someofthebirdshadmates,othersdidn*t.Thefemalesshiftedaroundabit,andthenmostofthemhoppedovertositbesidejustonespeaker.Allthebirdsthatmadeaclearchoicelikedsongsmeantforafemaleaudience,evenifthey1dnevermetthemale.Matedfemalesalsohadachancetolistentotwodifferentperformancesongsonefromanunknownmale,andonefromtheirmate.Theyspentmoreztimelisteningtotheconcertversionoftheirmates*songs.Thissuggeststhatafterawhile,femaleslearntorecognizeandpreferthesongsoftheirmates.Scientiststhenstudiedthebrainsofthefemales.Theyfoundcertainareasofthebrainperkedupwhenthebirdslistenedtotheconcertsongs.Thesebrainareasmaybeinvolvedinrecognizingandevaluatingthesongs,andstoringthememoriesofthem.Thisresearchdealswithwhat*scalleddirectedcommunication,whenthecommunicatororsender,focusesthemessageforaspecificaudience.Onezexampleisthewaymomsspeaktotheirbabies.Mothersaroundtheworldusethesamesortofhigh-pitchedsing-songchatter,andthebabiesrespondbesttothosesounds.Songbirdsareoneoftheonlyotherspeciesknowntolearntheircommunication,inthiscasetheirsongs.45ஹWhatdoesthefirstparagraphsayaboutzebrafinches?A.Malezebrafinchesliketosingtofemalezebrafinches.B.Malezebrafinchessinglouderthanfemalezebrafinches.C.Malezebrafincheschangetheirsongsinfemalezebrafinches1presence.D.Malezebrafinchesliketolistentofemalezebrafinchessing.46ஹWhatdidtheresearchersfindintheirstudyoffemalezebrafinches?A.Femalefincheslikedsongsmalefinchessangforthem.B.Femalefinchesonlylikedsongsmalefinchessangfortheirmates.C.Femalefincheslikedtolistentosongsfrombothspeakers.D.Femalefincheschosethebestmalesingersastheirmates.47ஹWhatismeantby"concertsongs"intheseventhparagraph?A.Songssungbyzebrafinchesataconcert.B.Songssungbymalefinchesforfemalefinches.C•Songssungbyfemalefinchesformalefinches.D.Songssungbymalefinchestomanyfemalefinches.48ஹWhatisNOTtrueofdirectedcommunication?A.Thesenderofamessagehasaspecificaudience.B.Malezebrafinchessingtofemalefinches.C.Motherstalktotheirbabies.D.Malezebrafinchessingtothemselves.49ஹWhichofthefollowingcanbestreflectthethemeofthepassage?A.Chirpingaway.B.Birdsongsascommunication.C.Zebrafinchesandtheirlife.D.Enjoyingbirdsongs.5ᑖ⊡ᐰaᦻ3.WithGeneticGift2MonkeysAreViewingaMoreColorfulWorldzDaltonandSamaremalesquirrelmonkeys,aboutafoottall.50DaltonandSamleadamoreprotectedlifeinthelaboratoryofJayandMaureenNeitzattheUniversityofWashington,Seattle.Recently,theNeitzesendowedthemwithanewgeneticgifttheabilitytoseetheworldwithfullcolorvision.Malesquirrelmonkeyshaveonlytwoofthecolorpigments⁐dknownasopsinsef=,unlikepeoplewhohavethree.TheNeitzes,withKatherineMancusoandothercolleagues,usedthetechniqueofgenetherapytointroducethegeneforthemissingredpigmentintotheconecellsofthemonkeys1retinaseCg.51.

7Itwassomewhatsurprisingthatthemonkeys*brainscouldtakeadvantageofathirdopsin.Theretina,however,seemstoworkbyrecordingthedifferencebetweenthesignalsfromneighboringconesthecellsthatdetectcolor.52.zNewWorldmalemonkeyslikeDaltonandSamarechromaticallychallengedbecausetheirancestorssplitofffromOldWorldprimatesbeforefullcolorvisionevolved.Atthetimeofthesplit,primateshadonlytwovisualpigmentszonethatisparticularlysensitivetobluelightandanotherthatrespondsbesttoeithergreenorred,dependingonwhichvariantofthegeneisinherited.53Thegenefortheredorgreenopsinwasduplicated,allowingindividualstoseeredandgreeninsteadofjustoneortheother.NewWorldmonkeysneverdevelopedtheduplicatedgenebutmanyfemaleszhavefullcolorvisionnevertheless.Thereasonisthatthered/greenopsingeneliesontheXchromosomesofemaleswhoinheritadifferentversionzfromeachparenthavebothredandgreenopsinsalongwiththeblueopsinonanotherchromosomeh⁐i.54A.Butmales,withonlyoneXchromosome,inheritjustonevariantofthered/greenopsin-thegreenintheeaseofDaltonandSam.B.Severalmonthsafterthetherapy,DaltonandSamwereaidetoseeaworldinwhichredhuesj⁐werevisibleandorangesnolongerlookedlikelemons,theresearcherssayinthecurrentissueofNature.C.Theirancestorslivedbyeatingfruitandinsectsintheforestcanopy᪛lofCentralandSouthAmerica.D.Afterthesplit,whichbeganwiththeopeningoftheAtlanticbetweenAfricaandSunthAmericasome150millionyearsago,theOldWorldprimatesbenefitedfrontageneticaccident.E.SotheextraopsingenegiventoDaltonandSamwouldhavechangedthesignalfromaffectedconesandhencethemessageforwardedfromtheretinatothevisualcortexinthebrain.F.Themonkeyexperimentwouldhelpresearchersunderstandthecircuitry-usedbytheprimatebraintoanalyzecolor.6ᑖ"XmnTheDevelopmentofRubberHereisthestoryofrubber.Fromtheearliesttimeitwascommonknowledge55thePeruviansthatwhenacutwasmadeintheoutsideskinofarubbertree,awhiteliquid56milkcameoutandthat57thisastickyzoḄmassofrubbermightbemade.Thisrubberissoftwhenwarm,sothatitispossibletogiveitany58.ThePeruviansmadethe59thatitwasverygoodforkeepingoutthewet.Thenintheearly1800's,theAmericansmadeuseofitforthefirsttime.Firsttheymadeovershoesto60theirfeetdry.ThencameacertainMr.Mackintosh,whomadecoatsofclothcoveredwithnaturalrubber.FromthatdaytothiswehavebeencoatingclothwithrubberasMr.Mackintosh61,andourraincoatsarestillnamedafterhim.Butthesefirstrubberovershoesandraincoatswereallsoftandstickyinsummer,and62andinelasticpqឋḄinthewinterwhenitwascolD.ButtherubberwehavetodayissoftandelasticᨵqឋḄ,63verystrongmeveninthewarmestsummerandthecoldestwinter.Thiswasmade64byamancalledGoodyear.Aftermany65,hefoundthatnitricacidtᾠ⏚madetherubbermuchbetter,butitisnothardandstrongenough.Thenastrangethingtook66.Afriendofhis,NicholasHayward,hadtheideainhissleepthatrubbermightbemadehardandstrongifmixedwithsulfurwxandputinthesun.Goodyearputthisidea67thetest,andsawthatitdidhavemoreorlessthedesiredeffectthoughsomewhatlessthanmore.Theonlyeffectithadwasontheoutsideoftherubber.Itiscommonknowledgenowthatthe68tomakerubberhardandstrongisbyheatingitwithsulfur.IttookGoodyearfourmoreyearstofindthismethoD.Whenatlasthedidit,hehad69atall.Everythingofthesmallestvaluehadbeenusedtogetmoney,evenhissons*school-books.

855>A.forB.toC.aboutD.with56>A.likeB.alikeC.resembledD.similar57ஹA.onB.fromC-upD.in58>A.useB.heatC.pressureD.form59ஹA.creationB.inventionC.discoveryD.recognition60>A.retainB,keepC.holdDset61ஹA.didB.builtC.triedD.conducted62ஹA.weakB.gentleC.hardD.strong63ஹA.orB.howeverC,thoughD.even64ஹA.capableB.probableC.practicalD.possible65ஹA.experimentsB.checksC.discoveriesD.works66>A.formB.placeC-shapeD.size67ஹA.onB.toC.inD.with68>A.systemB.styleC•wayD.direction69ஹA.everythingB.anythingC,nothingD.somethingyᫀ1ᑖ⌱⚗1>A{G᪆}ᦑᔾḼᐰpᦪ஺lureᔾ|஺᝞Cheeseluredmice.᝘ᔾὁ஺attractᔾI,ᨬᔠ⚪஺᝞weallareattractedtothepainting.ᡃᔾI஺entertain஺᝞Guestswereentertainedbytheshow.⊤¡¢£¤஺receive¥ᦈ஺᝞receivealetterᦈH§¨஺serve©ª஺᝞Shehasservedthefamilyforthirtyyears.᝛©¬®ᓝ°஺2ஹBequals±¡students²³teachersᦟµsubordinatesA஺⚪¶peersG·¸''±ºᙢ¼Ḅ¡஻1¾¿⌱ÀB⚗஺3ஹC4ஹB{G᪆}forbidÁban⊤Â''ἭÄஹÅÆஹÅÇ஻handleÈஹᜐᳮஹÊËஹÌᑴinvestigateÎÏ஺5ஹC6ஹB{G᪆}Ð⚪ὃÏḄÑÒÓÔÕḄÖ᪆஺×Ø⌱⚗¶1A⌱⚗locationḄÙÑ''¼ÚஹᙢÛ஻1᝞Themapshowsthepreciselocationofmyschool.ÜᙢÝÞÂßᡃḄ²᪥Ḅáâ¼Ú஺C⌱⚗preparationḄÙÑ''Æᜓஹ⚜ᜓ஻1ᐸæÑprepare஺D⌱⚗stationḄÙÑ“èஹéè"1᝞apowerstationëᵯèrailwaystationíéè஺B⌱⚗positsionḄÙÑ''Y᝱ஹYïஹ¼஻1᝞Ourpositionisverycritica1.ᡃḄYïðñᓻញ஺⚪¶ᑖḄÙÑ''ôXஹ᛻⍗஻1¾¿B⌱⚗ᔠ⚪஺7ஹA8ஹCintelligent÷øùḄroughúûḄrobustüiýḄ1ᏉᐰḄrevivableÿᐶḄ஺⚪energetic''Ḅ஻ᡠ⌱C஺9ஹC

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