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Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbeseriouslyimpaired;withoutotherswewouldsoondie.Tinyamountsofsomehormonescanmodifymoodsandactions,ourinclinationtoeatordrink,ouraggressivenessorsubmissiveness,andourreproductiveandparentalbehavior.Andhormonesdomorethaninfluenceadultbehavior;earlyinlifetheyhelptodeterminethedevelopmentofbodilyformandmayevendetermineanindividual’sbehavioralcapacities.Laterinlifethechangingoutputsofsomeendocrineglandsandthebody’schangingsensitivitytosomehormonesareessentialaspectsofthephenomenaofaging.
Communicationwithinthebodyandtheconsequentintegrationofbehaviorwereconsideredtheexclusiveprovinceofthenervoussystemuptothebeginningofthepresentcentury.TheemergenceofendocrinologyasaseparatedisciplinecanprobablybetracedtotheexperimentsofBaylissandStarlingonthehormonesecretion.Thissubstanceissecretedfromcellsintheintestinalwallswhenfoodentersthestomach;ittravelsthroughthebloodstreamandstimulatesthepancreastoliberatepancreaticjuice,whichaidsindigestion.Byshowingthatspecialcellssecretchemicalagentsthatareconveyedbythebloodstreamandregulatedistanttargetorgansortissues.Baylissandstarlingdemonstratedthatchemicalintegrationcouldoccurwithoutparticipationofthenervoussystem.
Theterm“hormone”wasfirstusedwithreferencetosecretion.StarlingderivedthetermfromtheGreekhormone,meaning“toexciteorsetinmotion.Theterm“endocrine”wasintroducedshortlythereafter“Endocrine”isusedtorefertoglandsthatsecretproductsintothebloodstream.Theterm“endocrine”contrastswith“exocrine”,whichisappliedtoglandsthatsecrettheirproductsthoughductstothesiteofaction.Examplesofexocrineglandsarethetearglands,thesweatglands,andthepancreas,whichsecretspancreaticjuicethroughaductintotheintestine.Exocrineglandsarealsocalledductglands,whileendocrineglandsarecalledductless.
1.Whatistheauthor’smainpurposeinthepassage?
A.Toexplainthespecificfunctionsofvarioushormones.
B.Toprovidegeneralinformationabouthormones.
C.Toexplainhowtheterm“hormone”evolved.
D.Toreportonexperimentsinendocrinology.
2.Thepassagesupportswhichofthefollowingconclusions?
A.Thehumanbodyrequireslargeamountsofmosthormones.
B.Synthetichormonescanreplaceaperson’snaturalsupplyofhormonesifnecessary.
C.Thequantityofhormonesproducedandtheireffectsonthebodyarerelatedtoaperson’sage.
D.Theshortchildoftallparentsverylikelyhadahormonedeficiencyearlyinlife.
3.ItcanbeinferredfromthepassagethatbeforetheBaylissandStarlingexperiments,mostpeoplebelievedthatchemicalintegrationoccurredonly___.
A.duringsleep.
B.intheendocrineglands.
C.undercontrolofthenervoussystem.
D.duringstrenuousexercise.
4.Theword“liberate”couldbestbereplacedbywhichofthefollowing?
A.EmancipateB.DischargeC.SurrenderD.Save
5.Accordingtothepassageanothertermforexocrineglandsis___.
A.ductglands
B.endocrineglands
C.ductlessglands
D.intestinalglands.
Passage2
Questions6to10arebasedonthefollowingpassage:
Whenaluminumwasfirstproducedaboutahundredandfiftyyearsago,itwassodifficulttoseparateformtheoresinwhichitwasfoundthatitspricewashigherthanthatofgold.Thepriceremainedhighuntilanewprocesswasdiscoveredforrefiningthemetalwiththeaidofelectricityapproximatelythreequartersofacenturylater.Thenewmethodwassomuchcheaperthataluminumbecausepracticalformanypurposes,oneofwhichwasmakingpotsandpans.
Aluminumislightweight,rustproofandeasilyshapedintodifferentforms.Bymixingitwithothermetals,scientistshavebeenabletoproduceavarietyofalloys,someofwhichhavethestrengthofsteelbutweighonlyonethirdasmuch.
Today,theusesofaluminumareinnumerable.Perhapsitsmostimportantuseisintransportation.Aluminumisfoundintheengineofautomobiles,inthehullsofboats.Itisalsousedinmanypartsofairplanes.Infact,thehuge“airbus”planeswouldprobablyneverhavebeenproducedifaluminumdidnotexist.Bymakingvehicleslighterinweightaluminumhasgreatlyreducedtheamountoffuelneededtomovethem,Aluminumisalsobeingusedextensivelyinthebuildingindustryinsomecountries.
Sincealuminumissuchaversatile(多用的)metal,itisfortunatethatbauxite(铝土矿),whichisoneofitschiefsources,isalsooneoftheearth’smostplentifulsubstances.Asthesourceofaluminumisalmostinexhaustible,wecanexpectthatmoreandmoreuseswillbefoundforthisversatilemetal.
6.Thepriceofaluminumwassharplyreducedwhenpeoplediscoveredanewrefiningprocesswiththeaidof.
A.windB.solarenergyC.hydraulicpowerD.electricity
7.Aluminumis.
A.lightweight,rustproofbutnoteasilyshapedintodifferentforms
B.heavyweight,rustproofandeasilyshapedintodifferentforms
C.lightweight,rustproofandeasilyshapedintodifferentforms
D.lightweightandeasilyshapedintodifferentformsbutitiseasytobecomerusty
8.WhichofthefollowingisNOTtrue?
A.Aluminumiswidelyusedintransportation.
B.Aluminumisalsousedinmanypartsofairplanes.
C.Aluminumisbeingusedextensivelyinthebuildingindustry.
D.Aluminumisnotusedinitspureform.
9.Aluminumisfoundonearthmostlyintheformof.
A.puremetalB.bauxiteC.goldD.liquid
10.Whatisthepassagetalkingabout?
A.Thefeaturesofaluminumanditsfunctions.B.Theprocessofaluminum.
C.Thediscoveryofaluminum.D.Thepromisingfutureofaluminum.
Inthelast12yearstotalemploymentintheUnitedStatesgrewfasterthanatanytimeinthepeacetimehistoryofanycountry–from82to110millionbetween1973and1985–thatis,byafullonethird.Theentiregrowth,however,wasinmanufacturing,andespeciallyinno–blue-collarjobs…
Thistrendisthesameinalldevelopedcountries,andis,indeed,evenmorepronouncedinJapan.Itisthereforehighlyprobablethatin25yearsdevelopedcountriessuchastheUnitedStatesandJapanwillemploynolargeraproportionofthelaborforceInmanufacturingthandevelopedcountriesnowemployinfarming–atmost,10percent.TodaytheUnitedStatesemploysaround18millionpeopleinblue-collarjobsinmanufacturingindustries.By2010,thenumberislikelytobenomorethan12million.Insomemajorindustriesthedropwillbeevensharper.Itisquiteunrealistic,forinstance,toexpectthattheAmericanautomobileindustrywillemploymorethanone–thirdofitspresentblue-collarforce25yearshence,eventhoughproductionmightbe50percenthigher.
Ifacompany,anindustryoracountrydoesnotinthenextquartercenturysharplyincreasemanufacturingproductionandatthesametimesharplyreducetheblue-collarworkforce,itcannothopetoremaincompetitive–oreventoremain“developed.”Theattempttopreservesuchblue–collarjobsisactuallyaprescriptionforunemployment…
ThisisnotaconclusionthatAmericanpoliticians,laborleadersorindeedthegeneralpubliccaneasilyunderstandoraccept.WhatconfusestheissueevenmoreitthattheUnitedStatesisexperiencingseveralseparateanddifferentshiftsinthemanufacturingeconomy.Oneistheaccelerationofthesubstitutionofknowledgeandcapitalformanuallabor.Wherewespokeofmechanizationafewdecadesago,wenowspeakof“robotization“or“automation.”Thisisactuallymoreachangeinterminologythanachangeinreality.WhenHenryFordintroducedtheassemblylinein1909,hecutthenumberofman–hoursrequiredtoproduceamotorcarbysome80percentintwoorthreeyears–farmorethananyoneexpectstoresultfromeventhemostcompleterobotization.Butthereisnodoubtthatwearefacinganew,sharpaccelerationinthereplacementofmanualworkersbymachines–thatis,bytheproductsofknowledge.
1.Accordingtotheauthor,theshrinkageinthemanufacturinglaborforcedemonstrates______.
A.thedegreetowhichacountry’sproductionisrobotized
B.areductioninacountry’smanufacturingindustries
C.aworseningrelationshipbetweenlaborandmanagement
D.thedifferencebetweenadevelopedcountryandadevelopingcountry
2.Accordingtotheauthor,incoming25years,adevelopedcountryorindustry,inordertremaincompetitive,oughtto______.
A.reducethepercentageoftheblue-collarworkforce
B.preserveblue–collarjobsforinternationalcompetition
C.acceleratemotor–canmanufacturinginHenryFord’sstyle
D.solvetheproblemofunemployment
3.Americanpoliticiansandlaborleaderstendtodislike_____.
A.confusioninmanufacturingeconomy
B.anincreaseinblue–collarworkforce
C.internalcompetitioninmanufacturingproduction
D.adropintheblue–collarjobopportunities
4.Theword“prescription”in“aprescriptionforunemployment”maybetheequivalentto______
A.somethingrecommendedasmedicaltreatment
B.awaysuggestedtoovercomesomedifficulty
C.somemeasurestakeninadvance
D.adevicetodire
5.Thispassagemayhavebeenexceptedfrom________
A.amagazineaboutcapitalinvestment
B.anarticleonautomation
C.amotor-carmagazine
D.anarticleonglobaleconomy
