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常用繼電器有哪幾種類型?

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PartIIICloze Directions:Therearetwentyblanksinthefollowingpassage.Foreachblanktherearefourchoices.ChoosetheonethatbestfitsintothepassageandthenmarksyouranswerontheAnswerSheet. Beforethe20thcenturythehorseprovideddaytodaytransportationintheUnitedStates.Trainswereusedonlyforlong-distancetransportation. Todaythecaristhemostpopular61oftransportationinalloftheUnitedStates.Ithascompletely62thehorseasameansofeverydaytransportation.Americansusetheircarsfor6390percentofallpersonal64. MostAmericansareableto65cars. Theaveragepriceofa66madecarwas1050in1950,1740in1960andupto1750671975.DuringthisperiodAmericancarmanufacturerssetabout68theirproductsandworkefficiency. Asaresult,theyearlyincomeofthe69familyincreasedfrom1950to197570thanthepriceofcars.Forthisreason71anewcartakesasmaller72ofafamily’stotalearningstoday. In195173ittook8.1monthsofanaveragefamily’s74tobuyanewcar.In1962anewcar758.3ofafamily’sannualearnings.By1975itonlytook4.7576income.Inaddition,the1975carsweretechnically77tomodelsfrompreviousyears. The78oftheautomobileextendsthroughouttheeconomy79thecarissoimportanttoAmericans.Americansspendmoremoneyto80theircarsrunningthanonanyotheritem. 61.A.kindsB.meansC.meanD.types 62.A.deniedB.reproducedC.replacedD.ridiculed 63.A.hardlyB.nearlyC.certainlyD.somehow 64.A.tripB.worksC.businessD.travel 65.A.buyB.sellC.raceD.see 66.A.quicklyB.regularlyC.rapidlyD.recently 67.A.onB.inC.behindD.about 68.A.raisingB.makingC.reducingD.improving 69.A.unusualB.interestedC.averageD.biggest 70.A.slowestB.equalC.fasterD.lessthan 71.A.bringingB.obtainC.boughtD.purchasing 72.A.partB.halfC.numberD.side 73.A.clearlyB.proportionallyC.percentageD.suddenly 74.A.incomeB.workC.plansD.debts 75.A.usedB.spendC.costD.needed 76.A.months’B.dollarsC.familyD.year 77.A.famousB.superiorC.fastestD.purchasing 78.A.runningB.noticeC.influenceD.discussion 79.A.thenB.asC.soD.which 80.A.startB.leaveC.keepD.repair
試題分類： 大學(xué)英語四級
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PartIReadingComprehension Directions:Inthisparttherearefourpassages.Eachpassageisfollowedbyfourcomprehensionquestions.Readthepassageandanswerthequestions.ThenmarkyouranswerontheAnswerSheet. Passage1 Questions1to5arebasedonthefollowingpassage: Someyearsagothecaptainofashipwasveryinterestedinmedicine.Healwaystookmedicinebookstoseaandlikedtotalkaboutdifferentdiseases. Onedayalazysailoronhisshippretendedtobeill.Helayonhisbunk(鋪)andgroanedasifhewereverysick.Thecaptaincametoseehimandwasverypleasedtohaveapatienttolookafter.Hetoldthemantorestforafewdaysandmadetheothersailorsdohiswork.Threedayslateranothersailorpretendedthathehadsomethingwrongwithhischest.Oncemorethecaptainlookedinhismedicalbooksandtold“sick”mantohavearest. Theothersailorswereveryangrybecausetheyhadmoreworktodo.Thepatientshadthebestfoodandlaughedattheirfriendswhenthecaptainwasnotlooking.Atlastthemate(船長副手)decidedtocurethe“sick”men.Hemixedupsomesoap,soot(煙灰),glue(膠水)andotherunpleasantthings.Thenheobtainedpermissionfromthecaptaintogivehismedicinetothe“sick”men.Whentheytastedthemedicine,theyreallydidfeelill.Itwassohorriblethatoneofthepatientsjumpedoutofhibunk,ranupondeskandclimbedthehighestmastontheship.Hedidnotwantanymoremedicine. Thematetoldbothofthementhattheymusttakethemedicineeveryhalfanhour,nightandday.Thissooncuredthem.Theybothsaidtheyfeltbetterandwantedtostartwordagain.Thecaptainrealizedthatthementriedtodeceivehimsohemadethemworkveryhardfortherestofthevoyage. 1.Thefirstsailorpretendedtobeillbecausehewantedto. A.testthecaptain’sknowledgeofmedicineB.befreefromwork C.havethebestfoodontheshipD.playajokeonhisfriends 2.Whenthecaptainknewasailorwasill,he. A.didn’tcaremuchB.sentforadoctor C.lookedafterhimandtoldhimtohavearestD.gavehimsomemedicine 3.Thepatientsfeltbetterquicklybecause. A.theyhadbeengivenpropermedicine B.theylearnedthatthecaptainhadfoundoutthetruth C.theywerelaughedatbytheirfriends D.themedicinethemategavewashorrible 4.Whenthecaptainknewhehadbeendeceived,he. A.toldthemnottodosoagainB.losthistemper C.madethemworkharderD.firedthem 5.Whichofthefollowingbestsummarizesthepassage? A.AsuddenCure.B.TwoPatients.C.CaptainandSailors.D.ADifficultVoyage.
試題分類： 大學(xué)英語四級
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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“l(fā)iberate”couldbestbereplacedbywhichofthefollowing? A.EmancipateB.DischargeC.SurrenderD.Save 5.Accordingtothepassageanothertermforexocrineglandsis___. A.ductglands B.endocrineglands C.ductlessglands D.intestinalglands.
試題分類： 大學(xué)英語六級
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