2022年山东省滨州市公共英语五级(笔试)重点汇总（含答案）

2022年山东省滨州市公共英语五级(笔试)重点汇总（含答案）学校:________班级:________姓名:________考号:________

一、1.ListeningComprehension(15题)1.Physicalexercisesandfreedomfromworrymightbethetwomostimportantsecretsoflongevity.

A.RightB.Wrong

2.Accordingtothespeaker,howdodeveloperscontributetothereductionofamphibianpopulation?

A.Bytakingoverponds.

B.Byconstructingsewers.

C.Bybuildingdamsonrivers.

D.Byfloodingmarshes.

3.Whydoesthewomanrefertofootball?

A.Toillustratemen'sinterest.

B.Toillustratethatmenusuallydonottouchuponanythingimportantintalkingabouttheirworkandinterest.

C.Toprovemenaremostlyfootballfans.

D.Toshowthatmenintentionallytrytoavoidtalkingabouttheirtruefeelings.

4.Accordingtothetalk,onlyrealcharactersportrayedinbooksmaybecomeourfriends.

A.TrueB.Fasle

5.Whatservicemustbepaidfor?

A.Computerclasses.

B.Trainingsessions.

C.Laserprinting.

D.Packageborrowing.

6.What/Whoshouldstudentscontactiftheywanttogetasummerjob?

A.TheStucentUnion.

B.TheStudentEmploymentOffice.

C.TheWorkers'Union.

D.TheStudentPart-timeJobOffice.

7.Wherecan'tchilipeppergrowaccordingtothetalk?

8.Whenwillthespeakertalkabouttheeconomicandpoliticalchanges?

9.PartB

Directions:Youwillhear3conversationsortalksandyoumustanswerthequestionsbychoosingA,B,CorD.YouwillheartherecordingONLYONCE.

听力原文：M:Now,I'dliketosaythatIthinkthatthisgovernmentproposingtobuildmorenuclearpowerstationsinthiscountryisreallybeingstupid.Thepointaboutnuclearpoweristhatwehaven'tlearnttodoawaywiththewaste.Wehaven'tlearnttocopewiththewastefromityet.

W:Well,Isometimesthinkthat,youknow,they'vegotanimpossiblejob.ImeanalltheimpressionIgetisthatthereisnoalternative...well,that'stheimpressionIget.

M:No,no,noI...Idon'tagreewiththatatall.Thereareplentyofalternatives.There'sthesun...solarpower...thatisasourcethatisalwaysthere,wealwayshaveit.

W:Idon't...Idon'tquiteseewhatyou'regettingatactually,solarpower,what'sthat?

M:Well,theheatfromthesun,itcanbeusedinsolarpanelsonthetopsofhousesforheating,storinguppowertoheatwaterandtoheatthehouses,youknow,somesolarpanelsareinoperationalreadyandtheyaresavingmoney...

W:That'sagoodpointactually,butisitreallyviable,that,ImeanbecauseI'd...

M:SorryitmustbejAndtheonegreatadvantageisthatIcansee,ifthegovernmentsetupsmallunitstobuildsolarpanelsandtoinstallthem,itwouldbecreatingemploymentwhichwouldimprovetheunemploymentsituationandbringterrificadvantages.

W:IhaveheardthatinEngland,Imean,there'snotenoughsun,isthere?For,Imean,solarpanelshere?

M:Yes,well,that'snotquitetrue.I...thereisquiteabitofsun...youmaynotfeeltheactualheatofitonsomeoccasions.

W:No,youarerightthere!

M:Butthelightpowerfromthesunwill.

Whatdoesthemanthinkofthegovernment'spresentproposalaboutbuildingmorepowerstationsinthecountry?

A.It'sadangerousproposal.

B.It'sastupidproposal.

C.It'sanadvantageousproposal.

D.It'saviableproposal.

10.Besidestheproblemofspeakingtoofast,whatelsewillmakelisteningmoredifficult?

11.PartC

Directions:Youwillhearatalk.Asyoulisten,answerthequestionsorcompletethenotesinyourtestbookletforQuestions21-30bywritingNOTMORETHANTHREEwordsinthespaceprovidedontheright.YouwillhearthetalkTWICE.

Younowhave1minutetoreadQuestions21-30.

听力原文：Lasttimewestartedlookingatthequestionofmanagementandwonderingwhatthetermactuallymeant.Thenwetookabrieflookattheconceptofscientificmanagement.Youremember,wedecideditwasusefulbutnotenoughonitsown.Sotodaywe'regoingtolookatanotheraspect—behavioralmanagement.Youmaynotreallyhavecomeacrossthisword"behavioral"before,thoughI'msureyouarefamiliarwiththeword"behavior".Behavioralsimplymeanshavingtodowithbehavior.Andthatisourstartingpointfortoday:Wearegoingtostartbyrealizingthattheactivityofanyorganizationishumanactivity,designedtoachievehumangoals.Sowearereallytalkingabouthumanbehavior.

Anybusinessconcerndoestwothings.First,itprovideseithergoodsorservicesthatthecustomerneeds.Thatis,iteithermakesthingsordoesthingsforotherpeopleinexchangeformoney.Second,itprovidespeoplewithwork—andmostofushavetoworkinordertomakealiving.

Work,muchaswemaysometimeswishwedidn'thavetodoit,ornotquitesomuchofit,hasinfacttwoadvantages.First—andIspokeaboutthislasttime—itcangiveussatisfaction.Wecanbeproudofwhatwearedoing—likeacraftsmanmakingsomethingbeautiful,oradoctorofanursehelpingpeoplewhoareillorinpain.ThisiswhatIcalledjobsatisfaction,andwithoutitIamsureworkcanbecomeanawfulburden.Andonamorebasiclevel,workearnsusmoney,whichwecanusetobuythethingsweneedinordertolive,likefoodandsomewheretolive,aswellasalltheluxurieswecouldprobablydowithoutbutstillliketohave.

Behavioralmanagementisbasedonaresearchofhowpeoplebehaveatwork.Itusesthefindingsofpsychologistsandsociologists,andsoon.Thesemakeastudyofindividualsandgroupstoseewhatthingsinfluencethewaytheybehaveindifferentconditions.Theresultscanthenbeusedtodesignthebestconditionsinwhichpeoplewillperform—orbehave—inthewaythatamanagerwantsthemtoinordertomakeabusinessmoreefficientandtoachieveitsgoals.Theyhavecollectedalotofevidenceandformulatedalotoftheoriestohelpthemanager,andthereisnodoubtthatproperlyunderstoodandapplied,thiscanbeveryuseful.

Butstillwereturntothefactthatpeopleareindividuals,alldifferentfromeachother,andall—aswesay—withmindsoftheirown.Sonomatterwhatthemanagerknowsaboutthewaypeoplebehaveingroupsandsoon,hehasreallytotreateveryoneonhisstaffasanindividualinhisownright.Ofcourse,hecanbehelpedinthisbyknowinghowtoencouragepeopletodothings,howtostimulatethemtobehaveinacertainway,andsoon.Amanagercanhimselfbetaughthowtodothis,buthoweverunscientificthismaysound,itismorelikelythatagoodmanagerisbornratherthantrained.Hehassomenaturalabilitytorecognizewhatpeoplearelikelytodo,whatabilitiestheyhave,andotherthingslikethat.Realizingthis,andthenapplyingwhathehaslearnedabouthumanbehavior,iswhatmakessomeoneagoodmanager.

Sobehavioralmanagementismanagementbasedonanassessmentofanindividualandtheapplicationofwhatisknownabouthowpeopleingeneraltendtobehave.Likescientificmanagement,itisundoubtedlyuseful,butnot,thecompleteanswer.

Whatdidthespeakertalkaboutlasttime?

12.PartB

Directions:Youwillhear3conversationsortalksandyoumustanswerthequestionsbychoosingA,B,CorD.YouwillheartherecordingONLYONCE.

听力原文：Doyoufindgettingupinthemorningdifficultandpainful?Thismightbecalledlaziness,butDr.Kleimanhasanewexplanation.Hehasprovedthateveryonehasadailyenergycycle.

Duringthehourswhenyoulaborthroughyourworkyoumaysaythatyou're“hot”.That'strue.Thetimeofdaywhenyoufeelmostenergeticiswhenyourcycleofbodytemperatureisatitspeak.Forsomepeoplethepeakcomesduringtheforenoon.Forothersitcomesintheafternoonorevening.Noonehasdiscoveredwhythisisso.Thepossibleexplanationisthatoneisathistemperature-and-energypeakintheevening.Muchfamilyquarrelingendswhenhusbandsandwivesrealizewhattheseenergycyclesmean,andwhichcycleeachmemberofthefamilyhas.

Youcan'tchangeyourenergycycle.butyoucanlearntomakeyourlifefititbetter.Habitcanhelp,Dr.Kleimanbelieves．Maybeyou'resleepyintheeveningbutfeelyoumuststayuplateanyway．Counteractyourcycletosomeextentbyhabituallystayinguplaterthanyouwantto.Ifyourenergyislowinthemorningbutyouhaveanimportantjobtodoearlyintheday,risebeforeyourusualhour.Thiswon'tchangeyourcycle,butyou'llgetupandworkbetteratyourlowpoint.

Getofftoaslowstartwhichsavesyourenergy.Getupwithaleisurelyyawnandstretch.Sitontheedgeofthebedaminutebeforeputtingyourfeetonthefloor.Avoidthetroubleforcleanclothesbylayingthemoutthenightbefore.Wheneverpossible,doroutineworkintheafternoonandsavetasksrequiringmoreenergyorconcentrationforyoursharperhours.

Whatshouldonedoifhewantstoworkmoreefficientlyathislowpointinthemorning?

A.Changehisenergycycle.

B.Overcomehislaziness.

C.Getupearlierthanusual.

D.Gotobedearlier.

13.PartC

Directions:Youwillhearatalk.Asyoulisten,answerthequestionsorcompletethenotesinyourtestbookletforQuestions21-30bywritingNOTMORETHANTHREEwordsinthespaceprovidedontheright.YouwillhearthetalkTWICE.

Younowhave1minutetoreadQuestions21-30.

听力原文：Asyouknow,manybigchangeshappenedafterChristopherColumbusandotherEuropeanscametotheAmericas500yearsago.TodayI'mgoingtotalkaboutachangeintheworlddietthewaypeoplecookedandate.Fivehundredyearsago,therewasabigchangeinthedietofpeopleallovertheworld.

Let'stalkaboutthedietinEurope500yearsago.Oneimportantfoodwasmeat.Europeansatemanykindsofmeat,includingbeef,lamb,goat,andpork.Europeansalsoatedairyproducts,milkandcheesemadefromthemilkofcowsandgoats.TheEuropeansateseveraldifferentgrains:Mostpeopleatewheat,andsomepeopleaterice,whichcamefirstfromAsia.

Now,let'slookatthedietintheAmericasabout500yearsago.ThedietofthenativeAmericanwasquitedifferentfromthedietoftheEuropeans.ThisisbecausetheEuropeanmeats,dairyproducts,andgrainsdidn'texistintheAmericas.However,thenativeAmericansatesomefoodthatdidn'texistinEurope.ThenativeAmericansatedifferentvegetables,suchaspotatoesandtomatoes.Theyatedifferentgrains,suchascorn.Theyatedifferentmeat,suchasturkeyandotherwildbirds.Theyalsousedspicessuchaschocolateandhotchilipeppers.NoneofthesefoodsexistedinEurope500yearsago.

Nowlet'stalkaboutthebigchangeintheworlddiet500yearsago,afterColumbusandtheEuropeanswenttotheAmericas.

AfterEuropeanswenttotheAmericas,thedietofthenativeAmericanschangedalot.WhentheEuropeanswenttotheAmericas,theytookmanynewkindsoffoodwiththem.TheEuropeansgavesomeofthefood,themeat,dairyproducts,andgrainstothenativeAmericansandthenthenativeAmericansstartedtousetheEuropeanfoodintheircooking.Asaresult,thedietintheAmerica'stodayisverydifferentfromtheirdiet500yearsago.Forexample,ifyougotoacountrylikeMexico,youcanseethatthetraditionalMexicanfoodusesalotofbeef,pork,cheese,wheat,andrice,allfoodsthatcamefromEuropewithColumbus.

AftertheEuropeansreturnedtoEuropefromtheAmericas,therewasalsoabigchangeinthedietofpeopleinEuropeandtherestoftheworld.WhentheEuropeansreturnedtoEurope,theytookmanynewkindsoffoodbackfromtheAmericas.Theytookbackthevegetables,grains,andspicesthattheyfoundintheAmericas.Littlebylittle,peoplealloverEuropestartedusingthenewfoodsintheircooking,andthenthefoodsspreadaroundtheworldtoAfrica,theMiddleEastandAsia.

Someofthenewfoodspreadveryquicklyaroundtheworld.Oneexampleisthechilipepper.Youmaybesurprisedtoknowthat500yearsago,thechilipepperdidn'texistinmanycountriesthatarefamoustodayfortheirhotandspicyfoodmadewithchilies.Actually,wethinkthatthefirstchilipepperwastakentoSpainbyColumbusin1493,whenhereturnedfromtheAmericas.Afteronly100years,chilipeppershadspreadallaroundtheworld.Theygroweasilyinwarmweather.TheonlyplacethatthechilipepperdidnotbecomepopularwasNorthernEurope,probablybecauseitistoocoldtogrowchilipepperseasily.

Althoughchilipeppersspreadquickly,otherfoodsfromtheAmericasspreadveryslowly.Potatoesareagoodexample.Ittookabout250yearsforthepotatoestospreadaroundtheworld.ThereasonittooksolongisthatEuropeansthoughtthatpotatoeswerepoisonous.ThepotatolookedalotlikeaverypoisonousplantthatgrewinEurope.Peoplewereafraidtoeatpotatoes!Foralongtime,peopleonlyusedpotatoestof

14.PartA

Directions:Youwillhearatalk.Asyoulisten,answerQuestions1-10bycirclingTRUEorFALSE.YouwillhearthetalkONLYONCE.Younowhave1minutetoreadQuestions1-10.

听力原文：Everyyeartherearereportsofpeopledyingastheresultofextremelyhotweather.Manyofthevictimsareoldpersons,whoseheartsorbreathingsystemsdecline.Butmanydiefromlackofwater.

Waterisnecessaryforlifeandgoodhealth.Weoftenforgetthisfactwhenwethinkabouttheotherbuildingblocksoflifesuchasvitamins,mineralsandproteins.Wecanliveformanydayswithouteating,buttwoorthreedayswithoutwaterusuallyleadstodeath.

Thehumanbodymaylooksolid,butmostofitiswater.Newbornbabiesareasmuchas85%water.Womenareabout65%waterandmenabout75%.Womenusuallyhavelesswaterthanmenbecausewomen,ingeneral,havemorefatcells,andfatcellsholdlesswaterthanotherkindsofcells.

Waterdoesmanydifferentthingstokeepushealthy.Itcarrieshormones,antibodiesandfoodsthroughthebody,andcarriesawaywastematerials.Thatiswhydifferentpartsofthebodycontaindifferentamountsofwater.Forexample,bloodis83%water,musclesare75%water,thebrainis74%,andbonesare25%,.

Waterisalsonecessaryforcoolingthebodyunderhotweatherandwhenweareworkinghardorexercising.Watercarriesbodyheattothesurfaceoftheskin,wheretheheatislostthroughperspiration.Researcherssaycoolliquidscoolusfasterthanwarmliquids,becausecoldliquidstakeupmoreheatinsidethebodyandcarryitawayfaster.Theysay,however,thatcoldsweetdrinksdonotworkwellbecausethesugarslowstheliquidfromgettingintotheblood-stream.

Researchersalsonotethatfatcellsblockbodyheatfromescapingquickly.Fatcellsundertheskinactlikewarmclothingtokeepbodyheatinside.Thisiswhyoverweightpeoplehaveamoreeasytimestayingcoolthanthinpeople.

Thebodyloseswatereverydaythroughperspirationandurine.Ifwelosetoomuch,wewillbecomesick.A10%dropinbodywatercancausethebloodsystemtofail.A15%~20%dropusuallyleadstodeath.Toreplacewhatislost,healthexpertssaygrowingpersonsshoulddrinkabout2litersofliquidseachday,andmoreinhotweather.Theysaywecanalsogetsomeofthewaterweneedinthefoodsweeat.Mostfruitsandvegetablesaremorethan80%water.Meatsare50%~60%water.Andevenbreadisabout33%water.Watermaybeoneofthemostsimpleofallchemicalsubstances,butitisthemostimportantsubstancethatweputintoourbodies.

Waterisakindofchemicalsubstance.

A.TrueB.Fasle

15.What'stheCivilRightsMovementfor?

二、2.UseofEnglish(10题)16.(47)

17.

【C7】

18.

【C16】

19.

【C18】

20.

【C14】

21.Pollutionisa"dirty"word.Topollutemeanstocontaminate--topsoilorsomethingbyintroducingimpuritieswhichmake【C1】______unfitoruncleantouse.Pollutioncomesinmanyforms.Weseeit,smellit,【C2】______it,drinkit,andstumblethroughit.Weliterallylivedinandbreathepollution,and【C3】______surprisingly,itisbeginningto【C4】______ourhealth,ourhappiness,andourcivilization.

Oncewethoughtofpollution【C5】______meaningsimplythesmog—thechoking,stinging,dirty【C6】______thathoversovercities.Butairpollution,whileitis【C7】______themostdangerous,isonlyonetypeofcontaminationamongseveral【C8】______attackthemostbasiclifefunctions.

Throughtheuncontrolleduseofinsecticides,manhaspollutedtheland,【C9】______thewildlife.By【C10】______sewageandchemicalsintoriversandlakes,wehavecontaminatedour【C11】______water.Wearepollutingtheoceans,too,kiltingthefishand【C12】______deprivingourselves【C13】______aninvaluablefoodsupply.

Partoftheproblemisourexploding【C14】______.Moreandmorepeopleareproducingmorewastes.Butthisproblemisintensifiedbyour"throw-away"technology.EachyearAmericans【C15】______of7millionautos,20milliontonsofwastepaper,25millionpoundsoftoothpastetubesand48millioncans.Wethrowawaygumwrappers,newspapers,andpaperplates.Itisnolongerwiseto【C16】______anything.Todayalmosteverythingisdisposable.【C17】______ofrepairingatoasteroraradio,itiseasierandcheapertobuyanotheroneanddiscardtheold,even【C18】______95percentofitspartsmaystillbefunctioning.Babydiapers,whichusedtobemadeofreusablecloth,arenowpaperthrow-aways.Soonwewillwearclothingmadeof【C19】______:"Wearitonceandthrowitaway"willbethesloganofthefashionableconsciousness.

Whereisthisalltoend?Areweturningtheworldintoagiganticdump,oristherehopethatwecansolvethepollutionproblem?【C20】______,solutionsareinsight.Afewofthemarepositivelyingenious.

【C1】

22.(48)

23."Down-to-earth"meanssomeoneorsomethingthatishonest,realisticandeasytodealwith.Itisapleasuretofind【31】______whoisdown-to-earth.Apersonwhoisdown-to-earthiseasytotalk【32】______andacceptsotherpeopleasequals.Adown-to-earthpersonisjustthe【33】______ofsomeonewhoactsimportantorproud.

Down-to-earthpersonsmaybe【34】______membersofsociety,ofcourse.Buttheydonotlettheirimportance"【35】______totheirheads".Theydonotconsiderthemselvestobebetterpersonsthan【36】______oflessimportance.Someonewhoisfilledwithhisownimportanceandpride,【37】______withoutcause,issaidtohave"hisnoseintheair".Thereis【38】______wayapersonwithhisnoseintheaircanbedown-to-earth.

Americans【39】______anotherexpressionthatmeansalmostthesameas"down-to-earth".Theexpressionis"both-feet-on-the-ground".Someone【40】______both-feet-on-the-groundisapersonwithagoodunderstanding【41】______reality.Hehaswhatiscalled"commonsense,"hemayhavedreams,【42】______hedoesnotallowthemtoblockhisknowledgeof【43】______isreal.

Theoppositekindof【44】______isonewhohashis"head-in-the-clouds".Amanwithhishead-in-the-cloudsisadreamer【45】______mindisnotintherealworld.

【46】______,suchadreamercanbebroughtbacktoearth.Sharpwordsfromteachercanusually【47】______aday-dreamingstudentdown-to-earth.

Usually,thepersonwhoisdown-to-earthisvery【48】______tohavebothfeetontheground.【49】______wehavebothourfeetontheground,whenwearedown-to-earth,weacthonestlyandopenly【50】______others.Ourlivesarelikethegroundbelowus,solidandstrong.

(31)

24.

【C4】

25.(41)

三、3.ReadingComprehension(15题)26.

Privatecompanieshavelittleinterestinproducingfluvaccinesbecauseof______.

A.complicatedprocess,highcost,lowprofitandhighrisk

B.shortagesoffertilizedchickeneggs

C.difficultyingrowinglivevirus

D.fastchangingoffluvirus

27.(80)

28.(72)

29.

Wecanlearnfromthetextthatartcriticshaveahistoryof______.

A.suppressingpainters'artinitiatives

B.favoringBotticelli'sbestpaintings

C.rejectingtraditionalartcharacteristics

D.undervaluingBotticelli'sachievements

30.PartB

Directions:Inthefollowingarticlesomeparagraphshavebeenremoved.ForQuestions66-70,choosethemostsuitableparagraphfromthelistA-Ftofitintoeachofthenumberedgaps.Thereisoneparagraphwhichdoesnotfitinanyofthegaps.MarkyouranswersonANSWERSHEET1.

AccordingtotheAmericanAcademyofDermatology,anestimated10to50millionpeopleinthiscountryhaveanallergicreactiontopoisonivyeachyear.Poisonivyisoftenverydifficulttospot.Itcloselyresemblesseveralothercommongardenplants,andcanalsoblendinwithotherplantsandweeds.Butifyoucomeintocontactwithit,you'11soonknowbytheitchy,blisteryrashthatformsonyourskin.Poisonivyisared,itchyrashcausedbytheplantthatbearsitsname.Manypeoplegetitwhentheyarehikingorworkingintheirgardenandaccidentallycomeintodirectcontactwiththeplant'sleaves,roots,orstems.Thepoisonivyrashoftenlookslikeredlines,andsometimesitformsblisters.

66.______

About85percentofpeopleareallergictotheurushiolinpoisonivy,accordingtotheAmericanAcademyofDermatology.Onlyatinyamountofthischemical—1billionthofagram—isenoughtocausearashinmanypeople.Somepeoplemayboastthatthey'vebeenexposedtopoisonivymanytimesandhavenevergottentherash,butthatdoesn'tnecessarilymeanthey'renotallergic.Sometimestheallergydoesn'temergeuntilyou'vebeenexposedseveraltimes,andsomepeopledeveloparashaftertheirveryfirstexposure.Itmaytakeuptotendaysfortherashtoemergethefirsttime.

67.______

Herearesomeotherwaystoidentifythepoisonivyplant.Itgenerallygrowsinaclusteroflow,weed-likeplantsorawoodyvinewhichcanclimbtreesorfences.Itismostoftenfoundinmoistareas,suchasriverbanks,woods,andpastures.Theedgesoftheleavesaregenerallysmoothorhavetiny"teeth".Theircolorchangesbasedontheseason—reddishinthespring;greeninthesummer;andyellow,orange,orredinthefall.Itsberriesaretypicallywhite.

68.______

Thebody'simmunesystemisnormallyinthebusinessofprotectingusfrombacteria,viruses,andtheirforeigninvadersthatcanmakeussick.Butwhenurushiolfromthepoisonivyplanttouchestheskin,itinstigatesanimmuneresponse,calleddermatitis,towhatwouldotherwisebeaharmlesssubstance.Hayfeverisanotherexampleofthistypeofresponse;inthecaseofhayfever,theimmunesystemoverreactstopollen,oranotherplant-producedsubstance.

69.______

Theallergicreactiontopoisonivyisknownasdelayedhypersensitivity.Unlikeimmediatehypersensitivity,whichcausesanallergicreactionwithinminutesofexposuretoanantigen,delayedhypersensitivityreactionsdon'temergeforseveralhoursorevendaysaftertheexposure.

70.______

Intheplaceswhereyourskinhascomeintocontactwithpoisonivyleavesorurushiol,withinonetotwodaysyou'lldeveloparash,whichwillusuallyitchrredden,burn,swell,andform.blisters.Therashshouldgoawaywithinaweek,butitcanlastlonger.Theseverityofthereactionoftenhastodowithhowmuchurushiolyou'vetouched.Therashmayappearsoonerinsomepartsofthebodythaninothers,butitdoesn'tspread—theurushiolsimplyabsorbsintotheskinatdifferentratesindifferentpartsofthebody.Thickerskinsuchastheskinontheonsolesofyourfeet,ishardertopenetratethanthinnerskinonyourarmsandlegs.

A.Becauseurushiolisfoundinallpartsofthepoisonivyplant—theleaves,stems,androots—it'sbesttoa-voidtheplantentirelytopreventarash.Thetroubleis,poisonivygrowsalmosteverywhereintheUnitedStates(withtheexceptionoftheSouthwest,Alaska,andHawaii),sogeographywon'thelpyou.Thegeneralruletoidentifypoisonivy,"leafletsthree,

31.

Towhichofthefollowingistheauthorlikelytoagree?

A.Anowboom,onthehorizon．

B.Tightenthebelt,thesingleremedy．

C.Cautionallright,panicnot．

D.Themoreventures,themorechances．

32.Theideaofafishbeingabletoproduceelectricitystrongenoughtolightlampbulbs—oreventorunasmallelectricmotor—isalmostunbelievable,butseveralkindsoffishareabletodothis.Evenmorestrangely,thiscuriouspowerhasbeenacquiredindifferentwaysbyfishbelongingtoverydifferentfamilies.

Perhapsthemostknownaretheelectricrays,ortorpedoes,ofwhichseveralkindsliveinwarmseas.Theypossessoneachsideofthehead,behindtheeyes,alargeorganconsistingofanumberofhexagonal-shapedcellsratherlikeahoneycomb.Thecellsarefilledwithajelly-likesubstance,andcontainaseriesofflatelectricplates.Oneside,thenegativeside,ofeachplate,issuppliedwithveryfinenerves,connectedwithamainnervecomingfromaspecialpartofthebrain.Currentgetsthroughfromtheupper,positivesideoftheorgandownwardtothenegative,lowerside.Generallyitisnecessarytotouchthefishintwoplaces,completingthecircuit,inordertoreceiveashock.

Thestrengthofthisshockdependsonthesizeoffish,butnewly-bornonesonlyabout5centimetersacrosscanbemadetolightthebulbofapocketflashlightforafewmoments,whileafullygrowntorpedogivesashockcapableofknockingamandown,and,ifsuitablewiresareconnected,willoperateasmallelectricmotorforseveralminutes.

Anotherfamousexampleistheelectriceel.Thisfishgivesanevenmorepowerfulshock.Thesystemisdifferentfromthatofthetorpedointhattheelectricplatesrunlongitudinallyandaresuppliedwithnervesfromthespinalcord.Consequently,thecurrentpassesalongthefishfromheadtotail.Theelectricorgansofthesefisharereallyalteredmusclesandlikeallmusclesareapttotire,sotheyarenotabletogenerateelectricityforverylong.PeopleinsomepartsofSouthAmericawhovaluetheelectriceelasfood,takeadvantageofthisfactbydrivinghorsesintothewateragainstwhichthefishdischargetheirelectricity.Thehorsesarelessaffectedthanamanwouldbe,andwhentheelectriceelshaveexhaustedthemselves,theycanbecaughtwithoutdanger.

TheelectriccatfishoftheNileandofotherAfricanfreshwatershasadifferentsystemagainbywhichcurrentpassesoverthewholebodyfromthetailtothehead.Theshockgivenbythisarrangementisnotsostrongastheothertwo,butisnonethelessunpleasant.Theelectriccatfishisaslow,lazyfish,fondofgloomyplacesandgrowstoabout1metrelong;itiseatenbytheArabsinsomeareas.

Thepowerofproducingelectricitymayservethesefishbothfordefenceandattack.Ifalargeenemyattacks,theshockwilldriveitaway;butitappearsthatthecatfishandtheelectriceelusetheircurrent