2021年河北省張家口市公共英語(yǔ)五級(jí)(筆試)真題(含答案)

2021年河北省張家口市公共英語(yǔ)五級(jí)(筆試)真題(含答案)學(xué)校:________班級(jí):________姓名:________考號(hào):________

一、1.ListeningComprehension(15題)1.Whyshouldamanagerstudybehavioralmanagement?

2.PartC

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

Younowhave1minutetoreadQuestions21-30.

聽(tīng)力原文：Inyouruniversitywork．youwillbeexpectedtogiveoralpresentationsintheform.ofreportsorsimplyintheformsofanswerstoquestions．Thereareseveralthingsyouoraldotomakeyouroralpresentationsclearandeasytounderstand．

Thefundamentalpointtorealizeisthatspeechandwritingaredifferent．Ifyouwanttobebestunderstood．youcan'tsimplyreadyourwrittenreportaloud．Thebiggestdifferencebetweenspokenandwrittenlanguageisthatreaderscanlookbackovertheprintedwordswhentheydon'tunderstand．Inspokenlanguage，however，listenerscan'tgobackandcheckthewords．Theycanrelyonlyonmemory．Sothefirstprincipletokeepinmindwhenyou'replanningtospeakinpublicisthatyouhavetohelpthelistener'smemory．Thismeansthatanoralreportcan'tdeliverinformationasrapidlyasawrittenreport．Thatis，youcan'thaveasmanypiecesofnewinformationpackedintothesamenumberofwords，becausetheywillcomeattoofastarateforthelistenertounderstand．

Inanoralreport，therateofdeliveryhastobeslower．Oneofthebestwaystohelpyouraudienceissimplytospeakslowly．Manypeoplespeaktoofastwhentheyspeaktoagroup．Thisisamistake，especiallyifyouhaveaforeignaccent，becauseitmakeslisteningmoredifficult．Beyondthesimpletechniqueofspeakingmoreslowlywhenyouspeakbeforeagroup，therearewaysoforganizingyourpresentationthatcanhelpthelistenerbeclearandunderstandyourmainpoints．

Theorganizationofyourtalkshouldallowenoughtimeforthelistenertothinkbothbeforeandaftereachnewidea．Thepurposeofthetimebeforethenewinformationistogivetheaudienceachancetounderstandthebackgroundclearly．Knowledgeofthebackground，orsettingoftheinformation，makesitmucheasiertoanticipatewhatkindofinformationiscomingnext．Ifthenewinformationoccurstooearly，withoutenoughbackground，thelistenersshouldnotbepreparedwithenoughbackgroundtobeabletopredictwhat'scoming．

I'vebeendescribingthetimeforthinkingbeforethenewinformation．It'salsoimportanttoprovidetimeforthinkingafterthenewinformation．Thisthinkingtimeallowslistenerstofittheideaintotheirgeneralknowledgeofthesubject．Thinkingtimegivesthelistenerachancetomakesurethattheideawasunderstoodbeforegoingontothenextnewidea．

Therearethreegeneralwaystogivethelistenertimeforthinkingandtimeafterapointofnewinformation．Onewayissimplytopause．Amomentofsilencegivesthelistenertimetotakeinthenewinformation，butthereareotherways．Asecondmethodistouseaparaphrase．Thatis，yousaythesamething，butindifferentwords．Thisparaphrase，orrepetitionoftheidea，helpsthelistenerstofixthethoughtintheirmemory．Athirdwaytogivethelistenertimetothinkistousewordsthatdon'tmeanmuch．Thesearewordsthatconveynoinformation，butjustfillintime．Forinstance，youmightsaysomethinglike“asI'vebeensaying”or“andsoforth”and“andsoon”．Thatkindofexpressiondoesn'treallysayanything．It'sjustmadeofwhatwecall“fillerwords”．Thewordshavenorealmeaning．buttheydoperform.ausefulfunction．sincetheyallowthelistenertimetothink．

Insummary，then，weknowthatorallanguageshoulddeliverinformationataslowerratethanyoucanuseinwrittenlanguage．Newinformationshouldbepresentedmoregradually．Thinkingtimeshouldbeprovidedbothbeforeandaftereachimportantnewitem．Thetimebeforeistoprovideabackgroundsothatthelistenerscanhaveachancetoanticipat

3.Chainsmakelearningflexible.

A.RightB.Wrong

4.What'sthecommonmisconceptionaboutartandscience?

5.What'sthenumberofstudentsfromMalaysia?

6.Whodonotprobablynoticethebeautyoftheoreticalphysics?

7.Accordingtothespeaker,whydopesticidesposeathreattoamphibians?

A.Pesticidescancauseanamphibian'sskintodryout.

B.Pesticideskilltheinsectsthatamphibiansdependonforfood.

C.Dissolvedpesticidescaneasilyenteramphibian'sbodies.

D.Amphibiansmayeatplantsthathavebeentreatedwithpesticides.

8.Womenhavemorefatcellssowomenhavelesswater.

A.TrueB.Fasle

9.WhatistheeffectoftheWomen'sMovement?

10.What'sthepercentageofstudentsinbusinessandmanagement?

11.Thetalkismainlyabouttheimportanceof"feltimages".

A.TrueB.Fasle

12.Do-it-YourselfhasbecomeoneofMrMiller'shobbies.

A.RightB.Wrong

13.Whatwillshemostlikelydoeventually?

A.Dobasicelectronics.

B.TeachEnglishliterature.

C.Produceeducationalgames.

D.Writecomputerprograms.

14.Thefrontdoortohishomedoesnotopenautomatically.

A.RightB.Wrong

15.Calories,naturalfood,mountainsandthedistancefrommoderncitiesaretheonlycommonthingsinthethreeregions.

A.TrueB.Fasle

二、2.UseofEnglish(10題)16.(43)

17.(39)

18.(38)

19.(45)

20.(35)

21.

【C7】

22.(40)

23.

【C4】

24.

【C17】

25.(33)

三、3.ReadingComprehension(15題)26.At18,AshanthiDeSilvaofsuburbanClevelandisalivingsymbolofoneofthegreatintellectualachievementsofthe20thcentury.Bornwithanextremelyrareandusuallyfataldisorderthatleftherwithoutafunctioningimmunesystem(the"bubble-boydisease",namedafteranearliervictimwhowaskeptaliveforyearsinasterileplastictent),shewastreatedbeginningin1990witharevolutionarynewtherapythatsoughttocorrectthedefectatitsverysource,inthegenesofherwhitebloodcells.Itworked.Althoughherlastgene-therapytreatmentwasin1992,sheiscompletelyhealthywithnormalimmunefunction,accordingtooneofthedoctorswhotreatedher,W.FrenchAndersonoftheUniversityofSouthernCalifornia.Researchershavelongdreamedoftreatingdiseasesfromhemophiliatocancerbyreplacingmutantgeneswithnormalones.Andthedreamingmaycontinuefordecadesmore."Therewillbeagene-basedtreatmentforessentiallyeverydisease,"Andersonsays,"within50years."

It'snotentirelyclearwhymedicinehasbeensoslowtobuildonAnderson'searlysuccess.TheNationalInstitutesofHealthbudgetofficeestimatesitwillspend$432millionongene-therapyresearchin2005,andthereisnoshortageofpromisingleads.Thetherapeuticgenesareusuallydeliveredthroughvirusesthatdon'tcausehumandisease."ThevirusissortoflikeaTrojanhorse,"saysRonaldCrystalofNewYorkPresbyterian/WeillCornellMedicalCollege."Thecargoisthegene."

AttheUniversityofPennsylvania'sAbramsohCancerCenter,immunologistCarlJunerecentlytreatedHIVpatientswithageneintendedtohelptheircellsresisttheinfection.AtCornellUniversity,researchersarepursuinggene-basedtherapiesforParkinson'sdiseaseandararehereditarydisorderthatdestroyschildren'sbraincells.AtStanfordUniversityandtheChildren'sHospitalofPhiladelphia,researchersaretryingtofigureouthowtohelppatientswithhemophiliawhotodaymustinjectthemselveswithexpensiveclottingdrugsforlife.Animalexperimentshaveshowngreatpromise.

Butsomehow,thingsgetlostinthetranslationfromlaboratorytopatient.Inhumantrialsofthehemophiliatreatment,patientsshowaresponseatfirst,butitfadesovertime.Andthefieldhasstillnotrecoveredfromthesetbackitsufferedin1999,whenJesseGelsinger,an18-year-oldwithararemetabolicdisorder,diedafterreceivinganexperimentalgenetherapyattheUniversityofPennsylvania.Someexpertsworrythatthefieldwillbetarnishedfurtherifthenextpeopletobenefitarenotpatientsbutathletesseekinganedge.Thissummer,researchersattheSalkInstituteinSanDiegosaidtheyhadcreateda"marathonmouse"byimplantingagenethatenhancesrunningability;already,officialsattheWorldAnti-DopingAgencyarepreparingtotestathletesforsignsof"genedoping".Buttheprincipleisthesame,whetheryou'retryingtohelpahealthyrunnerrunfasterorallowamuscular-dystrophypatienttowalk."Everybodyrecognizesthatgenetherapyisaverygoodidea,"saysCrystal."Andeventuallyit'sgoingtowork."

ThecaseofAshanthiDesilvaismentionedinthetextto______.

A.showthepromiseofgene-therapy

B.giveanexampleofmoderntreatmentforfataldiseases

C.introducetheachievementofAndersonandhisteam

D.explainhowgene-basedtreatmentworks

27.

Thephrase"talkingshop"(Line4,Para.6)probablymeans______.

A.talkingaboutshopping

B.discussingone'sworkwithcolleagues

C.exchangingpersonalnews

D.talkingwithfriendsinagroup

28.

Intheirstudy,researchersledbyPierreMaquettookadvantageofthetechniqueof______.

A.exposingalong-heldfolkwisdom

B.clarifyingthepredictionsondreams

C.makingcontrastsandcomparisons

D.correlatingeffectswiththeircauses

29.(75)

30.

Privacystandardsmadebyindividualstatesareineffectivebecause______.

A.thestandardsofdifferentstatescontradicteachother

B.onlinecommunicationisnotrestrictedtoanystate

C.thesestandardsignorethefederallawonthematter

D.thesestandardsareonlyapplicabletoregionalwebsites

31.Theideaofafishbeingabletoproduceelectricitystrongenoughtolightlampbulbs-oreventorunasmallelectricmotor—isalmostunbelievable,butseveralkindsoffishareabletodothis.Evenmorestrangely,thiscuriouspowerhasbeenacquiredindifferentwaysbyfishbelongingtoverydifferentfamilies.

Perhapsthemostknownaretheelectricrays,ortorpedoes,ofwhichseveralkindsliveinwarmseas.Theypossessoneachsideofthehead,behindtheeyes,alargeorganconsistingofanumberofhexagonal-shapedcellsratherlikeahoneycomb.Theceilsarefilledwithajelly-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;butitappearsthatthecatfishandtheelectriceelusetheircurrentmostoftenagainstsmallerfish,stunningthemsothattheycaneasilybeoverpowered.

Whichofthefollowingcanproducethestrongestshock?

A.Theelectriceel.

B.Theelectriccatfish.

C.Thenewly-bornelectrictorpedoes.

D.Thefully-grownelectricray.

32.Defendersofspecialprotectivelaborlegislationforwomenoftenmaintainthateliminatingsuchlawswoulddestroythefruitsofacentury-longstrugglefortheprotectionofwomenworkers.Evenabriefexaminationofthehistoricpracticeofcourtsandemployerswouldshowthatthefruitofsuchlawshasbeenbitter;theyare,inpractice,moreofacursethanablessing.

Sex-definedprotectivelawshaveoftenbeenbasedonstereotypicalassumptionsconcerningwomen'sneedsandabilities,andemployershavefrequentlyusedthemaslegalexcusesfordiscriminatingagainstwomen.AftertheSecondWorldWar,forexample,businessesandgovernmentsoughttopersuadewomentovacatejobsinfactories,thusmakingroominthelaborforceforreturningveterans.Therevivalorpassageofstatelawslimitingthedailyorweeklyworkhoursofwomenconvenientlyaccomplishedthis.Employershadonlytodeclarethatovertimehourswereanecessaryconditionofemploymentorpromotionintheirfactory,andwomencouldbequitelegallyfired,refusedjobs,orkeptatlowwagelevels,allinthenameof"protecting"theirhealth.Byvalidatingsuchlawswhentheyarechallengedbylawsuits,thecourtshavecolludedovertheyearsinestablishingdifferent,lessadvantageousemploymenttermsforwomenthanformen,thusreducingwomen'scompetitivenessonthejobmarket.Atthesametime,eventhemostwell-intentionedlawmakers,courts,andemployershaveoftenbeenblindtotherealneedsofwomen.Thelawmakersandthecourtscontinuetopermitemployerstoofferemployeehealthinsuranceplansthatcoverallknownhumanmedicaldisabilitiesexceptthoserelatingtopregnancyandchildbirth.

Finally,laborlawsprotectingonlyspecialgroupsareoftenineffectiveatprotectingtheworkerswhoareactuallyintheworkplace.Somechemicals,forexample,posereproductiverisksforwomenofchildbearingyears;manufacturersusingthechemicalscomplywithlawsprotectingwomenagainstthesehazardsbyrefusingtohirethem.Thusthesex-definedlegislationprotectsthehypotheticalfemaleworker,buthasnoeffectwhateveronthesafetyofanyactualemployee.Thehealthriskstomaleemployeesinsuchindustriescannotbenegligible,sincechemicalstoxicenoughtocausebirthdefectsinfetusesorsterilityinwomenarepresumablyharmfultothehumanmetabolism.Protectivelawsaimedatchangingproductionmaterialsortechniquesinordertoreducesuchhazardswouldbenefitallemployeeswithoutdiscriminatingagainstany.

Insum,protectivelaborlawsforwomenarediscriminatoryanddonotmeettheirintendedpurpose.Legislatorsshouldrecognizethatwomenareintheworkforcetostay,andthattheirneeds—goodhealthcare,adecentwage,andasafeworkplace—aretheneedsofallworkers.Lawsthatignorethesefactsviolatewomen'srightsforequalprotectioninemployment.

Accordingtotheauthor,whichofthefollowingresultedfromthepassageorrevivalofstatelawslimitingtheworkhoursofwomenworkers?

A.Womenworkerswerecompelledtoleavetheirjobsinfactories.

B.Manyemployershaddifficultyinprovidingjobsforreturningveterans.

C.Manyemployersfoundithardtoattractwomenworkers.

D.Thehealthofmostwomenfactoryworkersimproved.

33.(77)

34.PartA

Directions:ReadthefollowingtextsandanswerthequestionswhichaccompanythembychoosingA,B,CorD.MarkyouranswersonANSWERSHEET1.

Opinionpollsarenowbeginningtoshowthat,whoeveristoblameandwhateverhappensfromnowon,highunemploymentisprobablyheretostay.Thismeansweshallhavetomakewaysofsharingtheavailableemploymentmorewidely.

Butweneedtogofurther.Wemustasksomeprimaryquestionsaboutthefutureofwork.Wouldwecontinuetotreatemploymentasthenorm?Wouldwenotratherencouragemanyotherwaysforself-respectingpeopletowork?Shouldwenotcreateconditionsinwhichmanyofuscanworkforourselves,ratherthanforanemployer?Shouldwenotaimtorevivethehouseholdandtheneighborhood,aswellasthefactoryandtheoffice,ascentersofproductionandwork?

Theindustrialagehasbeentheonlyperiodofhumanhistoryinwhichmostpeople'sworkhastakentheform.ofjobs.Theindustrialagemaynowbecomingtoanend,andsomeofthechangesinworkpatternswhichitbroughtmayhavetobereversed.Thisseemsadauntingthought.But,infact,itcouldprovidetheprospectofabetterfutureforwork.Universalemployment,asitshistoryshows,hasnotmeanteconomicfreedom.

Employmentbecamewidespreadwhentheenclosuresofthe17thand18thcenturiesmademanypeopledependentonpaidworkbydeprivingthemoftheuseoftheland,andthusofthemeanstoprovidealivingforthemselves.Thenthefactorysystemdestroyedthecottageindustriesandremovedworkfrompeople'shomes.Later,astransportationimproved,firstbyrailandthenbyroad,peoplecommutedlongerdistancestotheirplacesofemploymentuntil,eventually,manypeople'sworklostallconnectionwiththeirhomelivesandtheplaceinwhichtheylived.

Meanwhile,employmentputwomenatadisadvantage.Inpre-industrialtime,menandwomenhadsharedtheproductiveworkofthehouseholdandvillagecommunity.Nowitbecamecustomaryforthehusbandtogoouttopaidemployment.leavingtheunpaidworkofthehomeandfamilytohiswife.Taxandbenefitregulationsstillassumethisnormtodayandrestrictmoreflexiblesharingofworkrolesbetweenthesexes.

Itwasnotonlywomenwhoseworkstatussuffered.Asemploymentbecamethedominantform.ofwork,youngpeopleandoldpeoplewereexcluded—aproblemnow,asmoreteenagersbecomefrustratedatschoolandmoreretiredpeoplewanttoliveactivelives.

Allthismaynowhavetochange.Thetimehascertainlycometoswitchsomeeffortandresourcesawayfromtheidealistgoalofcreatingjobsforall,totheurgentpracticaltaskofhelpingmanypeopletomanagewithoutfulltimejobs.

Researchcarriedoutintherecentopinionpollsshowsthat______.

A.availableemploymentshouldberestrictedtoasmallpercentageofthepopulation

B.newjobsmustbecreatedinordertorectifyhighunemploymentfigures

C.availableemploymentmustbemorewidelydistributedamongtheunemployed

D.thenowadayhighunemploymentfiguresareatruthoflife

35.

Theword"cleared"(Line4,Paragraph3)mightmean______.

A.permittedB.removedC.provedD.produced

36.

Privatecompanieshavelittleinterestinproducingfluvaccinesbecauseof______.

A.complicatedprocess,highcost,lowprofitandhighrisk

B.shortagesoffertilizedchickeneggs

C.difficultyingrowinglivevirus

D.fastchangingoffluvirus

37.(74)

38.(73)

39.(72)

40.

Howdothepublicfeelaboutthecurrenteconomicsituation?

A.Optimistic.B.Confused.C.Carefree.D.Panicked.

四、閱讀理解(5題)41.

第

22

題

Theauthorimpliesinthesecondparagraphthat__________．

42.

第

38

題

WhatCanbeconcludedaccordingtotheauthor’sviewofthe“obesitygenes”?

43.

第

50

題

5.__________

44.

第

27

題

Itcanbeinferredfromthetextthattheretailpriceofpetrolwillgoupdramaticallyif__________.

45.

根據(jù)下列文章回答36～40題：

第

36

題

Accordingtosomedoctorsandpoliticians，theamountofsaltconsumed__________.

參考答案

1.Makebusinessefficient/achievegoal．

2.Answerstoquestions．

3.A

4.Completelyseparate/exclusive．

5.over23000/23000

6.Thegeneralpublic

7.C

8.A

9.Male-and-femalerelationshipchanged

10.18.9%/18.9percent

11.A

12.A

13.C

14.B

15.B

16.wherewhere解析：此題考查where引導(dǎo)的定語(yǔ)從句，修飾前面提到的plane，trainorbus。所以此處應(yīng)填關(guān)系副詞“where”。

17.useuse解析：后面的一句話"Theexpressionis‘both-feet-on-the-ground．’”表示down-to-earth的另一種表達(dá)方法是both-feet-on-the-ground。而后一種說(shuō)法是美國(guó)人的用法，常常被美國(guó)人使用。故答案為use。

18.nono解析：本句話的意思是“那些趾高氣揚(yáng)的人不可能是那些平易近人的人”。這是否定的意思，故答案為no。

19.disposedispose解析：由前一句“但是這個(gè)問(wèn)題因?yàn)槲覀兊摹耙淮涡浴奔夹g(shù)而加劇了?！笨芍?，此處應(yīng)為“丟掉，扔掉”之意，即disposeof。

20.accordingaccording解析：accordingto為“依據(jù)”，為固定短語(yǔ)，意為“根據(jù)美國(guó)的民意調(diào)查”。所以此處填according。

21.underunder解析：underguidance意為“在…指導(dǎo)下”，為固定短語(yǔ)。

22.byby解析：由日本政府收集的數(shù)據(jù)?？疾楸粍?dòng)語(yǔ)態(tài)的用法，“由…”用介詞“by”。所以此處應(yīng)填“by”。

23.thatthat解析：此空后的內(nèi)容為maintain的內(nèi)容，即此空后的句子為maintain的賓語(yǔ)，應(yīng)填一個(gè)可引導(dǎo)賓語(yǔ)從句的詞。

24.rationalrational解析：從文章的后面可以知道，顧客們已經(jīng)要結(jié)算了，認(rèn)為都買(mǎi)了該買(mǎi)的商品。但是售貨員在他們等著付賬的過(guò)程中巧妙的利用顧客們的購(gòu)物沖動(dòng)向他們推銷(xiāo)，而不是理性購(gòu)物。故答案為rational。

25.notnot解析：此空前半句意為“我們真地生活在污染中，呼吸著它”，而后半句意為“它開(kāi)始…我們的健康、幸福和文明?！憋@然，這是因果關(guān)系，故中間的surprisingly前只能加個(gè)否定詞not。

26.A解析：文章第一句話對(duì)用基因療法治療Ashanthi所患罕見(jiàn)疾病的成功給與了很高的評(píng)價(jià)，并在第一段未指出醫(yī)生們對(duì)基因療法寄予了極高的期望。因此正確答案為A。

27.B解析：talkshop意為“談公事”。

28.C解析：這個(gè)題考察的是對(duì)后面幾段的歸納。首先在第三段開(kāi)始“Dr．MaquetusedanelectronicdevicecalledPET…theypracticedataskduringtheday，andastheysleptduringthefollowingnight．”這是一種對(duì)比性的研究方法。后來(lái)的第四段最后“…theirresponsetimeswhentheywokeupwereevenquickerthanwhentheywenttosleep．”也采用了對(duì)比的分析研究，故應(yīng)選C。

29.C解析：由C中的第二段“ThispartrepresentsthetensionsbetweenAmericaandFrance．”可知。

30.B解析：文章第三段最后兩句話“Moreover，itbecomesunworkable．．．theInternetdoesnotknowgeographicboundaries，andcompaniesandindividualscannotbeexpectedtocomplywithdiffering，andattimesconflicting，privacyrules．”這說(shuō)明各州制定的法律是不好實(shí)施的，因?yàn)榫W(wǎng)絡(luò)是不具有地域限制的。這種法律不能僅僅限制在某個(gè)州的范圍之內(nèi)。故應(yīng)選B。

31.A解析：由文章第四段中的“Anotherfamousexampleistheelectric