2022年辽宁省丹东市公共英语五级(笔试)知识点汇总（含答案）

2022年辽宁省丹东市公共英语五级(笔试)知识点汇总（含答案）学校:________班级:________姓名:________考号:________

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

A.RightB.Wrong

2.Afterdeliveringthenewinformation,whyshouldthespeakeralsogivehisaudiencesometime?

3.Whyarestudentsenthusiasticforpositionsinstudentorganizations?

A.Becausetheyhatetheconstantpressureandstrainoftheirstudy.

B.Becausetheywillthenbeabletostaylongerintheuniversity.

C.Becausesuchpositionshelpthemhuntbetterjobs.

D.Becausesuchpositionsareusuallywellpaid.

4.Whodonotprobablynoticethebeautyoftheoreticalphysics?

5.听力原文：Thehumannosehasgiventothelanguagesoftheworldmanyinterestingexpressions．Ofcourse，thisisnotsurprising．Withoutthenose，wecouldnotbreathenorsmell．Itisapartofthefacethatgivesapersonspecialcharacter．CyranodeBergeracsaidthatalargenoseshowedagreatmancourageous，courteous，manly，andintellectual．

Afamouswomanpoetwishedthatshehadtwonosestosmellarose!BlaisePascal，aFrenchphilosopher，madeaninterestingcommentaboutCleopatra'snose．Ifithadbeenshorter，hesaid，itwouldhavechangedthewholefaceoftheworld!

Historically，man'snosehashadaprincipalroleinhisimagination．Manhasreferredtothenoseinmanywaystoexpresshisemotions．Expressionsconcerningthenoserefertohumanweakness：anger，pride，jealousyandrevenge．

InEnglishthereareanumberofphrasesaboutthenose．Forexample，toholdupone'snoseexpressesabasichumanfeeling—pride．Peoplecanholduptheirnosesatpeople，things，andplaces．

Thephrase，tobeledaroundbythenose，showsman'sweakness．Apersonwhoisledaroundbythenoseletsotherpeoplecontrolhim．Ontheotherhand，apersonwhofollowshisnoseletshisinstinctguidehim．

Forthehumanemotionofrejection，thephrasetohaveone'snoseputoutofjointisverydescriptive．Theexpressionappliestopersonswhohavebeenturnedasidebecauseofarival．Theirprideishurtandtheyfeelrejected．Thisexpressionisnotnew．ItwasusedbyErasmusin1542．

ThisisonlyasamplingofexpressionsinEnglishdealingwiththenose．Thereareanumberofothers．However，itshouldbeasplainasthenoseonyourfacethatthenoseismorethananorganforbreathingandsmelling!

Whatisthispassagemainlyabout?

A.Thehumannoseasanorganforbreathingandsmelling.

B.Thenoseprovidinguswithvariousexpressions.

C.Awomanpoet'swishtohavetwonoses.

D.InterestingcommentsmadeonCleopatra'snose.

6.PartC

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

Younowhave1minutetoreadQuestions21-30.

听力原文：Imagineyouareahighschoolprincipal.Ateacherburstsbreathlesslyin-toyouroffice."There'safistfightinthedining-room,"shegasps.Theresponsibilityisyourstostopthefight.Howdoyoumeetit?

(1)Perhapsyou,asayoungster,tookpartinfightsandyourpresent-daytieswithstudentsarewarmandstrong.Youcanstopthefightbecauseyourprestigeishighamongthem.

(2)Youhaveaplanprepared.Otherschoolshavebeendisruptedsoyouhavealreadyplannedawaytostopanyfight.

(3)Youaretotallyconfidentofyourabilityinacrisis.Youarereadytostrideintothelunchroomandtakechargewithoutasinglequalm.Stoppingthefightwillbeeasy.

(4)Youferventlywishthatyoucoulddelegatethejobsinceyouknowthatyou'renotatalentedpeacemaker.Youwishyoucouldreturntothejobofplanningfortheschool'sneedtenyearshence.

Oneofthesefourreactionswouldbethefirstyou'dfeel,butonlyone—nottwoorthreeofthem,saythreepsychologists.Thesepsychologists—Dr.HarrietMann,Dr.HumphreyOsmondandMiriamSiegler—havecomeupwithaschemeforsortingpeopleregardlessoftheireducation,ageorsituation.

Theconceptisbasedonthepremisethatallpeoplehaveabasicwayofseeingtime.Eachofusispredisposedtoseealleventsfromtimevantagepoint.Eitheritremindsyouofthepast(past-oriented),howtheeventfitsintotoday,yesterday,andtomorrow(timeline),whatitistoday(present),orhowitwilldevelop(future).

Thethreebeganworkingin1968whenDr.MannandMrs.SieglerwereassistantstoDr.Osmond,director,attheBureauofResearch,NewJerseyNeuro-PsychiatricInstituteinPrinceton.Dr.OsmondiscurrentlydevisingwaystomakeempiricalstudiesofthetheoryandDr.MannisinCambridge,Massachusetts,writingabookontheWorldsofTime.Theirtake-offpointwasaninterestinobservationsmadebySwisspsychologistCarlGustavJung,whodescribedinthe1920sthetemperamentaldifferencesoffourpsychologicaltypes.Jungisknownasthefounderofanalyticpsychology.SinceJung'sworkin1921.however,noonehadconceivedofatheoreticalframeworkthatwouldaccountforthefourtypes.Withoutsuchaframework,therewasnopossibilityofsubstantiatingthatpeopleofdifferenttypesexperiencetheworldverydifferently.

Timeandspacearethetouchstonesinthesystem.Eachperson,afterall,useshistimesomehowandexistswithinandactsuponthespacearoundhim.Dr.Mann,andcompanyproposethatcertaintraitsaresharedbypersonsfallingineachofthefourcategories.

Thefirsttype,thepasttype,seestimeasbeingcircular.Forhim,thepastcropsupinthepresentandthenreturnstothepastasamemory.Heenjoyscollectingsouvenirsandkeepingdiaries.HetellsstoriesaboutGreatAuntHattieandalwaysremembersyourbirthday.

Pasttypesarepeggedbythissystemasemotionalpeoplewhoseetheworldinahighlysubjectiveway.Forinstance,SchoolPrincipalI(pasttype)couldidentifywiththefightandknowhowtohandleitbecauseofsomepastexperience—whetheritbesimilarfightsasachildhimselforonespreviouslydealtwithastheschoolprincipal.Inaddition,pasttypesusuallyfollowstrictmoralcodesandoftenarevaluedmoreforwhattheyarethanforwhattheydo.Thisqualityitself—becauseitlendsauthoritarianstrengthtoonewhopossessesit—mightcausethestudentstoquitfighting.Pasttypesoftenhavebeenfoundtobeskillfulatassessingtheexactemotionaltenorofaneventan

7.Thefrontdoortohishomedoesnotopenautomatically.

A.RightB.Wrong

8.Wangdecidestotakecoursesandpassexams.

A.RightB.Wrong

9.PartA

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

听力原文：Hello,everyone.TodayIwillintroduceyouthelearningchainsinBritain.Herethechainsrefertoschoolslinkedtogetheraspartofagroup.Theycanofferstudentsmanypracticaladvantages.

Whenpeopleareaskedtonamealanguageschool,moreoftenthannot,theythinkofoneofthelargeinternationalchainsofschools.Somearevastlanguageteachingorganizationswithschoolsinmanydifferentcountriesandmayteachjustonelanguage.

Oneofthemainstrengthsofthesechainsisthefactthattheirnameisfamiliartopeopleallovertheworld.Thiscanbeabigadvantageintheconfusingworldoflanguagelearning.Moststudentsarebewilderedbymelargechoiceofschoolsandcoursesonoffer,bothathomeandabroad,andsomanyprefertochooseaschoolwhichhasafamiliarnameandanestablishedreputation.Chainschoolsknowthis,andpartoftheirsuccessisduetoeffectivemarketingandadvertising,whichhelpstokeeptheirnamewell-known.

Butchainschoolsshouldnotbedismissedbyseriousstudentsjustbecausetheyuseclevermarketingtechniques.Theyhaveotherimportantstrengthenswhichcanprovideadvantagestostudents.Aschoolisonlyasgoodasitsteachersandfacilities,andmanychainsofferveryhighstandardsinboth.Morechainsrequirethattheirteachershaveinternationallyrecognizedqualificationsandamaximumamountofteachingexperience.Itisimportantforchainstomaintainthesestandardsatallschools,becausethereputationofthewholechaincanbeaffectedifoneschoolperformsbadly.

Studentsalsobenefitfromthestandardizedstructureofchains.Mostchainsusethesametextbooksinalltheirschools,andoftentheyproducetheirowncourseworkmaterials.Theyalsoorganizetheircoursesinmesamewaywhichmeansthatstartingdatesandcourselengthsareusuallythesameatallschools.

Forstudents,oneofthemainadvantagesofthisstandardizedstructureissimplicity.IfyoucannotdecidewhethertostudyintheU.S.orBritain,forexample,mostchainsallowstudentstostarttheirlanguagecourseatoneschoolandcontinueatanother,sotheycanexperiencedifferentregionsordifferentcountries,aspartofthesamestudytrip.

Chainschoolstendtobelargerthansinglecenterschools,whichcanalsohaveadvantagesforstudents.Withlargernumbersofstudents,schooladministratorscanachieveabettermixtureofnationalitiesinclassrooms.Thismeansthatstudentscanavoidbeingwithotherstudentswhospeaktheirlanguage.Thisgivesthemthechancetomeetstudentsfromothercountries,andtopracticetheirEnglishwiththem.

Somechainsofferstudentsaverysimplebookingandenrolmentprocedurewhichisalsouseful.Applicationformsandenrolmentproceduresarethesameforallschools,sostudentsneedonlysupplytheirdetailsonce.

Studentsmayfindthattheycanbooktheircourseabroadthrougharepresentativeofachainschoolintheirowntownorcity.Otherchainsofferacentralizedbookingfacility,sostudentsonlyhavetocontactonecentertomakeabookinganywhereintheworld.

Chainschoolsoftenoperateindifferentlocations,whereasasingleschoolislikelytobebasedpermanentlyinonebuilding.Manychainschoolsoperatetemporaryschools,particularlyduringthesummerholidays.InBritain,theyoftenusesecondaryschoolpremiseswhichareemptyduringtheschoolholidays.

StudyingEnglishinanEnglish-speakingcountryisthemosteffectivewaytolearnthelanguage,butformanystudentsthisisonlyonestageoftheirlearningcareer.Moststudentsstartlearning

A.TrueB.Fasle

10.ThosewhovisitLondonwillcertainlygoto______．

A.theTowerofLondon

B.Harrods

C.BuckinghamPalace

D.TheGreenwichvillage

11.A15%-20%dropinbodywatercancausethebloodsystemtofail.

A.TrueB.Fasle

12.Canyougiveanexampleof"fillerwords"?

13.Yourwishtovisitsomefar-offplacescanberealizedbyjustreadingbooks.

A.RightB.Wrong

14.Calories,naturalfood,mountainsandthedistancefrommoderncitiesaretheonlycommonthingsinthethreeregions.

A.TrueB.Fasle

15.Mr.Millerhadknownalotaboutcarpentryandelectricwiringbeforehewasengagedindo-it-yourself.

A.TrueB.Fasle

二、2.UseofEnglish(10题)16.

【C7】

17.(40)

18.(33)

19.

【C5】

20.(39)

21.(48)

22.

【C11】

23.

【C10】

24.(32)

25.

【C8】

三、3.ReadingComprehension(15题)26.

WhichofthestatementsabouttheteensisNOTtrue?

A.Theyareill-bredstudentsinschool.

B.Someofthemtake"realdrugs".

C.Teensneedsattention.

D.Afewcasuallydisplayscarsontheirarms.

27.

WhatadvicemightMaquetgivetothosewhohaveacrucialtestthenextday?

A.Memorizinggrammarwithgreatefforts.

B.Studytextbookswithcloseattention.

C.Havetheirbrainimagesrecorded.

D.Enjoytheirsleepatnightsoundly.

28.PartC

Directions:Answerquestions71-80byreferringtothefollowinggames.

Note:AnswereachquestionbychoosingA,BorCandmarkitonANSWERSHEET1.Somechoicesmayberequiredmorethanonce.

A=BOOK1B=BOOK2C=BOOK3D=BOOK4

Whichbook(s)say(s)that...

theclimateaffectsthefuturesustainableagriculturaldevelopment?71.______

environmentalcontrolisrelatedwiththenationalrevenues?72.______

theenvironmentalproblemsarenotcausedovernight?73.______

avarietyofspeciesareonthedecrease?74.______

agricultureisalsoafactorforfiledegradationofenvironment?75.______

pollutioncanbecontrolledbyincreasingtheproductioncostofpollutinggoods?76.______

pollutioncontrolneedsthesupportoftechnologyandtechniques?77.______

provideslessonsforagriculture,trade,landuseandtaxpolicyfromaneconomicperspective?

78.______

thedegradationofenvironmentcausesthechangeofclimate?79.______

theapproachestoresearchshouldbeadjustedtothechangingsituation?80.______

A

BOOK1

Thebookoffersacomprehensiveperspectiveontheconsequencesandpossiblepolicysolutionsforclimaticchangeaswemoveintothetwenty-firstcentury.Itassessestheimpactofpotentialfeatureglobalclimatechangeonagricultureandtheneedtosustainagriculturalgrowthfortheeconomicdevelopment.

Thebookbeginsbyexaminingtheroleofinternationalresearchinstitutionsinovercomingenvironmentalconstraintsonsustainableagriculturalgrowthandeconomicdevelopment.Theauthorsthendiscusshowagriculturalresearchsystemsmayberestructuredtorespondtoglobalenvironmentalproblemssuchasclimatechangeandlossofgeneticdiversity.Thediscussionthenextendstoconsiderenvironmentalaccountingandindexing,toillustratehowenvironmentalqualityc;inbeincludedformallyinmeasuresofnationalincome,socialwelfareandsustainability.Thethirdpartofthebookfocusesontheeffectsofandpolicyresponsestoclimatechange.Chaptersinthispartexaminetheeffectofclimatechangeonproduction,trade,landusepatternsandlivelihoods.Theyconsiderimpactsonthedistributionofincomebetweendevelopedanddevelopingcountriesremainamajoreconomicactivity.Authorstakeonaneconomy-wideperspectivetodrawlessonsforagriculture,trade,landuseandtaxpolicy.

B

BOOK2

Theozonelayeristhreatenedbychemicalemissions;theclimateisendangeredfromfossilanddeforestation,andglobalbiodiversityisbeinglostbyreasonofthousandsofyearsofhabitatconversions.Globalenvironmentalproblemsariseoutoftheaccumulatedimpactsfrommanyyears'andmanycountries'economicdevelopment.Inordertoaddresstheseproblemsthestatesoftheworldmustcooperatetomanagetheirdevelopmentprocessestogether—thisiswhataninternationalenvironmentalagreementmustdo.Butcantheworld'scountriescooperatesuccessfullytomanageglobaldevelopment?Howshouldtheymanageit?Whoshouldpayfortheprocess,aswellasfortheunderlyingproblems?

Thisbookpresentsanexaminationofboththeproblemandtheprocessunderlyinginternationalenvironmentallawmaking:therecognitionofinternationalinterdependence,thenegotiationofinternationalagreementsandtheevolutionofinternationalresourcemanagement.Itexaminesthegeneralproblemofglobalresourcemanagementbymeansofgeneralprinciplesandcasestudiesandbylookingathowandwhyspecificnegotiationsandagreementshavefailedtoachievetheirtargets.

Thebookisdesigned

29.

TheviewsofVasariandHomeonBotticelli'sproductsare______.

A.identicalB.complementaryC.oppositeD.similar

30.PartA

Directions:ReadthefollowingtextsandanswerthequestionswhichaccompanythembychoosingA,B,CorD.MarkyouranswersonANSWERSHEET1.

TodayTVaudiencesallovertheworldareaccustomedtothesightofAmericanastronautsintip-topcondition,withfairhair,crew-cuts,goodteeth,anuncomplicatedsenseofhumourandaseverelylimitednon-technicalvocabulary.

Whatmarksoutanastronautfromhisearthboundfellowhumanbeingsissomethingofadifficultproblem.Shouldyouwishtointerviewhim,youmustapplybeforehand,andyoumustbepreparedforalongishwait,evenifyourapplicationmeetswithsuccess.Itis.inanycase,outofthequestiontointerviewanastronautabouthisfamilylifeorpersonalactivities,becausealltheastronautshavecontractswithanAmericanmagazineunderconditionsforbiddinganyunauthorizeddisclosuresabouttheirprivatelives.

Certainobviousqualifiesareneeded.Anyonewhowouldbeaspacemanmustbeinperfecthealth,musthavepowersofconcentration(sinceworkinsideaspacecraftisexceptionallydemanding)andmusthaveconsiderablecourage.Again,space-workcallsfordedication.Courageanddedicationareparticularlyessential.Inthewell-knowncaseoftheChallengersevencrewmemberslosttheirlivesinspacebecauseofthefaultyequipmentintheshuttle.Anothermustbeoutstandingscientificexpertise.Itgoeswithoutsayingthattheyallhavetohaveprofessionalaeronauticalqualificationsandexperience.

Astrikingfeatureoftheastronautsistheirages.Fortheyoungerman,inhistwenties,say,spaceisout.OnlyoneofthefiftymenworkingforNASAin1970wasunder30.TheoldestastronauttodateisAlanShepard,America'sfirstmaninspace,who,atnearlyfifty,wasalsothemanwhocaptainedApollo13.Theaverageageisthelatethirties.ThecrewmembersofApollo11wereallbornwellbeforetheSecondWorldWar.In1986theChallengerastronautshadanaverageageof39.Therangewasfrom35to46.

Inasocietywheremaritalcontinuityisnotalwaysexhibited,theastronauts'recordinthisrespecthitsyouintheeye.OfallthemarriedmeninNASAgroup,onlytwoorthreearedivorcedfromtheirwives.Mindyou.itishardtotellwhethersomethinginthebasiccharacterofanastronautencouragesfidelityorwhethertheselectionprocessdemandsthatacandidateshouldbehappilymarried.

TheNASAastronautsliveinunattractivesmallcommunitiesdottedhereandtherearoundthebaseinTexas.Youwouldexpectthemtofindtheirfriendsfromamongtheirprofessionalassociates,butthisisnotthecase.Rather,theyprefertomakefriendswiththenormalfolkintheirdistricts.Astronauts,likeeverybodyelse,mustgetfedupwithtalkingshopallthetime,andwhereastheyareindeedanelite,theirdailylifeoutsideworkshouldbeasnormalaspossible,ifonlyforthesakeoftheirfamilies.

Asfortheastronauts'politicalleanings,theyseemtobetowardstheright.Thismaybeduetothefactthatalargeproportionoftheastronautshaveamilitarybackground.Ontheotherhand,itcouldbejustcoincidence.

Detailsoftheprivatelifeofanastronautarehardtocomeby,becausetheyare______.

A.hisownbusinessandprivacy

B.secretsasfarasinterviewsareconcerned

C.thepropertyofanAmericanmagazine

D.thefirst-ratenationalconfidentialinformation

31.(77)

32.PartB

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

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

66.______

About85percentofpeopleareallergictotheurushiolinpoisonivy,accordingtotheAmericanAcademyofDermatology.Onlyatinyamountofthischemical—1billionthofagram—isenoughtocausearashinmanypeople.Somepeoplemayboastthatthey'vebeenexposedtopoisonivymanytimesandhavenevergottentherash,butthatdoesn'tnecessarilymeanthey'renotallergic.Sometimestheallergydoesn'temergeuntilyou'vebeenex-posedseveraltimes,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,whichwillusuallyitch,redden,bum,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.Thegeneralrotetoidentifypoisonivy,"lea

33.PartC

Directions:Answerquestions71-80byreferringtothefollowinggames.

Note:AnswereachquestionbychoosingA,BorCandmarkitonANSWERSHEET1.Somechoicesmayberequiredmorethanonce.

A=HydropowerB=NuclearpowerC=SolarpowerD=WindpowerWhichpower(power's)...

wasdevelopedtoprovideelectricityforsatellitesatthebeginning?71.______

canpromotetourismdevelopment?72.______

maygiveoffdangerousradioactivepollutionintotheair?73.______

mayaffectthedownstreamwaterqualityandhaveanimpactonplantlife?74.______

stationscanincreasetofullpowerveryquickly?75.______

producessmallamountsofwaste?76.______

isagoodmethodofsupplyingenergytoremoteareas?77.______

providesaround20%oftheworld'selectricity?78.______

canbeusedtoheatyourwaterathomeinsteadofsomuchgasorelectricity?79.______

isnotrenewable?80.______

A

Hydropower

Introduction

Wehaveusedrunningwaterasanenergysourceforthousandsofyears,mainlytogrindcorn.

ThefirsthouseintheworldtobelitbyhydroelectricitywasCragsideHouse,inNorthumberland,England,in1878.In1882ontheFoxRiver,intheUSA,hydroelectricityproducedenoughpowertolighttwopapermillsandahouse.

Nowadaystherearemanyhydro-electricpowerstations,providingaround20%oftheworld'selectricity.Thenamecomesfrom"hydro",theGreekwordforwater.

Howitworks

Adamisbuilttotrapwater,usuallyinavalleywherethereisanexistinglake.

Waterisallowedtoflowthroughtunnelsinthedam,toturnturbinesandthusdrivegenerators.

Advantages

Oncethedamisbuilt,theenergyisvirtuallyfree.

Nowasteorpollutionproduced.

Muchmorereliablethanwind,solarorwavepower.

Watercanbestoredabovethedamreadytocopewithpeaksindemand.

Hydro-electricpowerstationscanincreasetofullpowerveryquickly,unlikeotherpowerstations.

Disadvantages

Thedamsareveryexpensivetobuild.

Buildingalargedamwillfloodaverylargeareaupstream,causingproblemsforanimalsthatusedtolivethere.

Findingasuitablesitecanbedifficult—theimpactonresidentsandtheenvironmentmaybeunacceptable.

Waterqualityandquantitydownstreamcanbeaffected,whichcanhaveanimpactonplantlife.

Isitrenewable?

Hydro-electricpowerisrenewable.

TheSunprovidesthewaterbyevaporationfromthesea,andwillkeepondoingso.

B

Nuclearpower

Introduction

NuclearpowerisgeneratedusingUranium,whichisametalminedinvariouspartsoftheworld.

Thefirstlarge-scalenuclearpowerstationopenedatCalderHallinCambria,England,in1956.

Somemilitaryshipsandsubmarineshavenuclearpowerplantsforengines.

Howitworks

Nuclearpowerstationsworkinprettymuchthesamewayasfossilfuel-burningstations,exceptthata"chainreaction"insideanuclearreactormakestheheatinstead.

ThereactorusesUraniumrodsasfuel,andtheheatisgeneratedbynuclearfission.Neutronssmashintothenucleus

34.

Whycouldnotceramicsbeusedwidelyinthepast?

A.Becauseoftheirbrittleness.

B.Becausepeopledidn'tknowhowtousethem.

C.Becausetheywerenotuseful.

D.Becausetheycouldnotresistheat.

35.(76)

36.

Fromthelastparagraphwecaninferthat______.

A.thegovernmenthopestosolvetheproblembywayofvolunteerrestrictions

B.morethan47millionAmericanswhoarequalifiedtogetfluvaccineshotscannotgetthemthisyear

C.Americahastodealwithalimitedsupplyoffluvaccinesthisyear

D.normallyonlyasmallpercentageofAmericanpopulationgetsfluvaccineshotseachyear

37.Asthe2lstcenturybegins,anumberofleadersinpolitics,education,andotherprofessionsbelievethattheUnitedStatesmustadoptsomenewvaluestogoalongwiththeoldtraditionalones.WhatnewvaluesshouldAmericansadopt?Thisisaverydifficultquestiontoanswer.Certainly,agreatervalueshouldbeplacedontheconservationofnaturalresources;Americansshouldlearntouselessandwasteless.ButconservationhasneverbeenastrongvaluetoAmericans,whohavebelievedthattheircountryofferedanendless,abundantsupplyofnaturalr