2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案

2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案第1页共1页2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案一、单项选择题（共10小题，每题2分）（每小题只有一个选项符合题意，请把正确选项的字母填在题后括号内）1.WhichofthefollowingisthecorrectwaytowriteadateinEnglish?A.January5,2026B.5January2026C.2026/01/05D.05/01/2026参考答案：A2.Whenwritingaformalletter,whichpartshouldyouincludefirst?A.GreetingB.BodyC.SignatureD.Subject参考答案：C3.Whatisthebestwaytostartanessayaboutyourfavoritehobby?A."Ilikesports."B."Sportsarefun."C."Myfavoritehobbyisbasketball."D."Basketballisapopularsport."参考答案：C4.Ifyouwanttoasksomeoneabouttheirplansfortheweekend,whichquestioniscorrect?A."Whatdoyoudointheweekend?"B."Whatareyoudoingthisweekend?"C."Whatwillyoudothisweekend?"D."Whatdidyoudolastweekend?"参考答案：C5.Whichofthefollowingisagoodtopicsentenceforaparagraphaboutthebenefitsofexercise?A."Exerciseisimportant."B."Manypeopleexerciseeveryday."C."Exercisecanimproveyourhealth."D."Somepeopleprefertoexerciseinthemorning."参考答案：C6.Whenwritingastory,whichelementhelpstocreateaclearpictureinthereader'smind?A.CharactersB.SettingC.PlotD.Theme参考答案：B7.Ifyouwanttogiveadviceonhowtostudyforatest,whichsentenceisthemosthelpful?A."Youshouldstudyhard."B."Studyingisimportant."C."Tostudyforatest,youneedtoreadthetextbook."D."Everyonestudiesdifferently."参考答案：C8.Whichofthefollowingisagoodwaytoendapersuasiveessay?A."Inconclusion,Ithinkthisisagoodidea."B."Thisismyopinion."C."Youshouldthinkaboutit."D."Ihopeyouagreewithme."参考答案：D9.Whenwritingareport,whichsectionshouldyouincludeaftertheintroduction?A.ConclusionB.BodyC.ReferencesD.Title参考答案：B10.Ifyouwanttodescribeaperson'sappearance,whichpartofspeechshouldyouuse?A.VerbB.AdjectiveC.NounD.Adverb参考答案：B二、填空题（共10小题，每题2分）（请把正确答案直接填写在题中横线上，填写不完整的不得分）1.PleasewritealettertoyourpenpalinAustralia,introducingyourdailylifeand______.参考答案：yourhobbiesandinterests2.Inyourschoolmagazine,youareaskedtowriteanarticleaboutthebenefitsofplantingtrees.Youshouldusethestructure:First,______.Second,______.Finally,______.参考答案：First,treescanimproveairquality.Second,theyprovideshadeandreducenoisepollution.Finally,plantingtreesisgoodfortheenvironment.3.Supposeyouareorganizingaschooldebate.Thetopicis"Shouldstudentsbeallowedtousesmartphonesinclass?".Yourteamisforthisidea.Writeashortspeech,startingwith"Goodmorning,everyone.Today,I'mheretoargue______."参考答案：theadvantagesofusingsmartphonesinclass4.YourEnglishteacherasksyoutowriteadiaryentryaboutyourweekendplan."ThisSaturday,I'mgoingto______withmyfriends.Wewill______.It'sgoingtobealotoffun!"参考答案：gotothezoo.takephotos5.Imagineyouareavolunteeratananimalshelter.Writeanoticetofindahomeforacutedog."Whoeverwantstoadoptthisdogshould______.Pleasecometoourcentertomeethim."参考答案：contacttheshelterbyphoneoremail.bringsomefoodforthedog6.Yourschoolisholdingasciencefair.Youaregoingtoshowamodelofthesolarsystem.Writeabriefintroductionforyourmodel."Thismodelshowsthe______.Thesunisatthecenter,andtheplanetsrevolvearoundit."参考答案：theplanetsinthesolarsystem7.Writeashortstoryaboutaboywhohelpsanoldladycrossthestreet."Oneday,ayoungboysawanoldlady______.Hequickly______tohelpher."参考答案：crossingthestreetalone8.YourfriendislearningEnglish.Writeaparagraphtogivehimsomeadviceonhowtoimprovehiswritingskills."Towritewell,youshould______.Also,trytoreadmoreEnglishbooksandarticles."参考答案：writemoreEnglishessaysandpracticeeveryday9.Writeacompositionaboutyourfavoriteseason.Explainwhyyoulikeit."Myfavoriteseasonisautumn.Ilikeitbecause______.Theweatheriscool,andtheleavesturnyellowandred."参考答案：Ilovethebeautifulsceneryandthefeelingofcoolness.10.YourschoolisgoingtohaveaculturalexchangeprogramwithaschoolinCanada.WritealettertoaCanadianstudent,introducingyourselfandyourschool."Mynameis______.IamastudentinGrade7.Ourschoolis______."参考答案：LiHua.amodernandinternationalschool三、判断题（共10小题，每题2分）（正确的打“√”，错误的打“×”，把判断符号填在题后括号内）1.TheGreatWallislocatedinnorthernChina.参考答案：√2.ItwasbuilttoprotectChinafrominvasions.参考答案：√3.TheGreatWallisabout21,196kilometerslong.参考答案：√4.ItwasfirstbuiltduringtheMingDynasty.参考答案：×5.TheGreatWalliswideratthetopthanatthebottom.参考答案：√6.ItisoneoftheNewSevenWondersoftheWorld.参考答案：×7.TheGreatWallismadeofstoneandbrick.参考答案：√8.ItisaUNESCOWorldHeritageSite.参考答案：√9.Pleasewritealettertoyourfriendaboutyourhometown.参考答案：×10.Inyourschoolmagazine,youcanwriteanarticleaboutenvironmentalprotection.参考答案：√四、简答题（共8小题，每题2分）（请分点作答，语言简明、要点齐全，写在对应题目下方的横线上）1.Pleasedescribethemainfeaturesofasolarpowerplantinthreesentences.参考答案：Asolarpowerplantconvertssunlightintoelectricityusingsolarpanels.Ittypicallyconsistsoflargearraysofphotovoltaiccellsthatcapturesolarenergyandconvertitintodirectcurrent(DC),whichisthentransformedintoalternatingcurrent(AC)foruseinhomesandbusinesses.Solarpowerplantsalsorequirestoragesystemstostoreexcessenergyforlateruse,makingthemareliablesourceofrenewableenergy.2.Whataretheadvantagesofusingwindenergyforelectricitygeneration?参考答案：Windenergyisacleanandrenewablesourceofelectricitygeneration.Ituseswindturbinestoconvertthekineticenergyofwindintomechanicalenergy,whichisthenconvertedintoelectricity.Theadvantagesofwindenergyincludeitsenvironmentalfriendliness,asitproducesnogreenhousegasemissionsduringoperation,anditssustainability,aswindisavirtuallyinexhaustibleresource.Additionally,windenergycanbedeployedinvariouslocations,includingremoteareas,makingitaversatileoptionforelectricitygeneration.3.Howdoeswaterconservationhelpprotecttheenvironment?参考答案：Waterconservationhelpsprotecttheenvironmentbyreducingthestrainonwaterresources.Itconserveswaterforfuturegenerations,ensurestheavailabilityofwaterforecosystems,andreducestheenergyrequiredforwatertreatmentanddistribution.Byusingwaterwisely,wecanminimizewaterpollution,preservebiodiversity,andmaintainthehealthofrivers,lakes,andwetlands.4.Explaintheimportanceofplantingtreesinurbanareas.参考答案：Plantingtreesinurbanareasisimportantforseveralreasons.Treesprovideshade,whichhelpsreducetheurbanheatislandeffectandlowersenergyconsumptionforcoolingbuildings.Theyalsoimproveairqualitybyabsorbingcarbondioxideandreleasingoxygen,andtheyhelppreventsoilerosion.Additionally,treesenhancetheaestheticvalueofcities,createhabitatsforwildlife,andcontributetotheoverallwell-beingofurbanresidents.5.Describetheprocessofphotosynthesisinplants.参考答案：Photosynthesisistheprocessbywhichplantsconvertsunlight,carbondioxide,andwaterintoglucoseandoxygen.Itoccursinthechloroplastsofplantcells,wherechlorophyllcapturessunlight.Theprocesscanbedividedintotwomainstages:thelight-dependentreactionsandthelight-independentreactions(Calvincycle).Duringthelight-dependentreactions,sunlightisusedtoproduceATPandNADPH,whicharethenusedintheCalvincycletoconvertcarbondioxideintoglucose.6.Whyisitimportanttoreduceplasticwaste?参考答案：Reducingplasticwasteisimportantbecauseplastictakesalongtimetodecompose,oftenpollutinglandandwaterecosystems.Itcanharmwildlife,asanimalsmayingestplasticorbecomeentangledinit.Additionally,theproductionofplasticcontributestogreenhousegasemissionsandclimatechange.Byreducingplasticwaste,wecanprotecttheenvironment,conserveresources,andpromoteamoresustainablelifestyle.7.Howcanrenewableenergysourcescontributetosustainabledevelopment?参考答案：Renewableenergysources,suchassolar,wind,andhydroelectricpower,contributetosustainabledevelopmentbyprovidingcleanandabundantenergy.Theyreducerelianceonfossilfuels,whicharefiniteandcontributetoairpollutionandclimatechange.Renewableenergysourcesalsopromoteenergyindependence,createjobs,andsupporteconomicgrowth.Byintegratingrenewableenergyintoourenergysystems,wecanbuildamoresustainableandresilientfutureforgenerationstocome.8.Whatarethebenefitsofusingpublictransportationsystems?参考答案：Usingpublictransportationsystemsoffersseveralbenefits.Itreducestrafficcongestion,whichimprovestraveltimesandreducesfuelconsumption.Italsohelpsreduceairpollutionbydecreasingthenumberofvehiclesontheroad.Publictransportationiscost-effectiveforindividualsandfamilies,anditpromotessocialequitybyprovidingaccesstotransportationforallmembersofthecommunity.Additionally,itcanhelpreducenoisepollutionandpreservenaturalresources.五、应用题（共8小题，每题3分）（请写出必要的文字说明、方程式和重要的演算步骤，只写最后结果不得分）1.Youareplanningaschoolgarden.Yourschoolhasarectangularpieceoflandwithalengthof20metersandawidthof15meters.Youwanttoplantvegetablesandflowersinthegarden.Theareaforvegetablesshouldbetwicetheareaforflowers.Howmanysquaremeterswillbeusedforflowersifyouwanttomaximizetheareaforvegetableswhileleavinga2-meterborderaroundthegardenforwalkingpaths?A.150squaremetersB.100squaremetersC.75squaremetersD.50squaremeters参考答案：B2.Alocalfactoryproducessolarpanels.ThenumberofsolarpanelsproducedeachdaycanbemodeledbythefunctionP(t)=50t+200,whereP(t)isthenumberofpanelsproducedandtisthenumberofdayssincethefactorystartedproduction.Ifthefactorywantstoproduceatleast1,000panelsinthefirst10days,whatistheminimumnumberofpanelstheyneedtoproduceeachdayonaverage?A.80panelsB.90panelsC.100panelsD.110panels参考答案：C3.Theschoollibraryisorganizingabookfair.Theyhave300bookstosell.Thecostofeachbookis5.Thelibrarywantstomakeaprofitofatleast1,000.Iftheysellallthebooks,whatistheminimumnumberofbookstheyneedtoselltoachievetheirprofitgoal?A.200booksB.250booksC.300booksD.350books参考答案：B4.Afarmerisplanningtoplantcropsonhisland.Hehas100acresofland.Hewantstoplanttwiceasmuchcornassoybeans.Ifhewantstoplantatleast30acresofsoybeans,whatisthemaximumnumberofacreshecanplantwithcorn?A.50acresB.60acresC.70acresD.80acres参考答案：B5.Acompanyisproducingsolarpanels.ThenumberofsolarpanelsproducedeachdaycanbemodeledbythefunctionP(t)=50t+200,whereP(t)isthenumberofpanelsproducedandtisthenumberofdayssincethecompanystartedproduction.Ifthecompanywantstoproduceatleast1,000panelsinthefirst10days,whatistheminimumnumberofpanelstheyneedtoproduceeachdayonaverage?A.80panelsB.90panelsC.100panelsD.110panels参考答案：C6.Theschoollibraryisorganizingabookfair.Theyhave300bookstosell.Thecostofeachbookis5.Thelibrarywantstomakeaprofitofatleast1,000.Iftheysellallthebooks,whatistheminimumnumberofbookstheyneedtoselltoachievetheirprofitgoal?A.200booksB.250booksC.300booksD.350books参考答案：B7.Afarmerisplanningtoplantcropsonhisland.Hehas100acresofland.Hewantstoplanttwiceasmuchcornassoybeans.Ifhewantstoplantatleast30acresofsoybeans,whatisthemaximumnumberofacreshecanplantwithcorn?A.50acresB.60acresC.70acresD.80acres参考答案：B8.Youareplanningaschoolgarden.Yourschoolhasarectangularpieceoflandwithalengthof20metersandawidthof15meters.Youwanttoplantvegetablesandflowersinthegarden.Theareaforvegetablesshouldbetwicetheareaforflowers.Howmanysquaremeterswillbeusedforflowersifyouwanttomaximizetheareaforvegetableswhileleavinga2-meterborderaroundthegardenforwalkingpaths?A.150squaremetersB.100squaremetersC.75squaremetersD.50squaremeters参考答案：B标准答案与解析一、单项选择题1.参考答案：A解析：本题考查日期的英文书写格式。选项A是美式英语的日期书写格式，正确；选项B是英式英语的日期书写格式，也是正确的，但美式英语更常用；选项C和D是数字表示法，不符合英文书写习惯。因此，A是最佳答案。2.参考答案：C解析：本题考查正式信件的写作顺序。正式信件通常先写收信人称谓，再写正文，最后写签名。因此，C是正确答案。3.参考答案：C解析：本题考查议论文的写作。一个好的开头应该直接点明主题，因此C是最佳选项。A和B过于简单，D没有明确主题。4.参考答案：C解析：本题考查一般将来时的用法。询问未来的计划应该使用一般将来时，因此C是正确答案。A和B使用现在时，D使用过去时，都不符合语境。5.参考答案：C解析：本题考查段落主题句的写作。主题句应该明确表达段落的主要内容，因此C是最佳选项。A和B过于笼统，D只是段落的一个细节。6.参考答案：B解析：本题考查故事写作中的要素。背景设定（setting）帮助读者想象故事发生的场景，因此B是正确答案。A、C和D都是故事的重要元素，但不是直接帮助读者想象场景的要素。7.参考答案：C解析：本题考查如何写建议性文章。具体的建议比笼统的说法更有帮助，因此C是最佳选项。A和B过于笼统，D没有提供具体建议。8.参考答案：D解析：本题考查议论文的结尾。一个好的结尾应该总结观点并呼吁读者接受，因此D是最佳选项。A、B和C都没有达到这个效果。9.参考答案：B解析：本题考查报告的写作结构。正文应该在引言之后，因此B是正确答案。A是结论，C是参考文献，D是标题。10.参考答案：B解析：本题考查形容词的用法。形容词用来描述名词的性质或特征，因此B是正确答案。A是动词，C是名词，D是副词。二、填空题1.参考答案：yourhobbiesandinterests解析：本题考查写作中的书信写作。根据题干中的"introducingyourdailylife"，可以知道需要介绍自己的日常生活，而日常生活通常包括爱好和兴趣，所以填入“yourhobbiesandinterests”。2.参考答案：First,treescanimproveairquality.Second,theyprovideshadeandreducenoisepollution.Finally,plantingtreesisgoodfortheenvironment.解析：本题考查写作中的议论文写作。根据题干中的"introducingthebenefitsofplantingtrees"，可以知道需要介绍种植树木的好处，可以从改善空气质量、提供阴凉、减少噪音污染、保护环境等方面进行阐述。3.参考答案：theadvantagesofusingsmartphonesinclass解析：本题考查写作中的演讲稿写作。根据题干中的"argueforthisidea"，可以知道需要为“学生在课堂上使用智能手机”这一观点进行辩护，所以填入“theadvantagesofusingsmartphonesinclass”。4.参考答案：gotothezoo.takephotos解析：本题考查写作中的日记写作。根据题干中的"goingtodosomethingwithmyfriends"，可以知道需要填写去哪里以及做什么，根据常识和题干中的"havealotoffun"，可以推测去动物园玩，所以填入“gotothezoo.takephotos”。5.参考答案：contacttheshelterbyphoneoremail.bringsomefoodforthedog解析：本题考查写作中的通知写作。根据题干中的"adoptthisdog"，可以知道需要填写如何领养这只狗，通常需要联系收容所，所以填入“contacttheshelterbyphoneoremail.bringsomefoodforthedog”。6.参考答案：theplanetsinthesolarsystem解析：本题考查写作中的说明文写作。根据题干中的"introductionforyourmodel"，可以知道需要介绍这个模型展示的内容，根据题干中的"solarsystem"，可以知道是太阳系，所以填入“theplanetsinthesolarsystem”。7.参考答案：crossingthestreetalone解析：本题考查写作中的小故事写作。根据题干中的"sawanoldlady"，可以知道需要填写老妇人当时的情况，根据题干中的"helpher"，可以推测老妇人是一个人过马路，所以填入“crossingthestreetalone”。8.参考答案：writemoreEnglishessaysandpracticeeveryday解析：本题考查写作中的建议写作。根据题干中的"improvehiswritingskills"，可以知道需要给朋友一些建议，通常建议要多写多练，所以填入“writemoreEnglishessaysandpracticeeveryday”。9.参考答案：Ilovethebeautifulsceneryandthefeelingofcoolness.解析：本题考查写作中的抒情文写作。根据题干中的"whyyoulikeit"，可以知道需要解释为什么喜欢秋天，根据题干中的"autumn"，可以知道需要填写秋天的景色和感觉，所以填入“Ilovethebeautifulsceneryandthefeelingofcoolness”。10.参考答案：LiHua.amodernandinternationalschool解析：本题考查写作中的书信写作。根据题干中的"introducingyourselfandyourschool"，可以知道需要介绍自己和学校，根据题干中的"studentinGrade7"，可以知道自己是七年级学生，所以填入“LiHua.amodernandinternationalschool”。三、判断题1.参考答案：√解析：本题考查地理常识。TheGreatWallisindeedlocatedinnorthernChina,sothestatementiscorrect.2.参考答案：√解析：本题考查历史知识。TheGreatWallwasprimarilybuilttoprotectChinafrominvasions,sothestatementiscorrect.3.参考答案：√解析：本题考查地理常识。TheGreatWallisapproximately21,196kilometerslong,sothestatementiscorrect.4.参考答案：×解析：本题考查历史知识。TheGreatWallwasfirstbuiltduringtheMingDynasty,nottheQinDynasty,sothestatementisincorrect.5.参考答案：√解析：本题考查物理知识。TheGreatWalliswideratthetopthanatthebottomforstructuralstability,sothestatementiscorrect.6.参考答案：×解析：本题考查文化常识。TheGreatWallisoneoftheNewSevenWondersoftheWorld,nottheNewSevenWondersoftheWorld,sothestatementisincorrect.7.参考答案：√解析：本题考查建筑知识。TheGreatWallismadeofstoneandbrick,sothestatementiscorrect.8.参考答案：√解析：本题考查文化常识。TheGreatWallisaUNESCOWorldHeritageSite,sothestatementiscorrect.9.参考答案：×解析：本题考查写作任务。Thetaskistowritealettertoyourfriendaboutyourhometown,notaboutenvironmentalprotection,sothestatementisincorrect.10.参考答案：√解析：本题考查写作任务。Inyourschoolmagazine,youcanwriteanarticleaboutenvironmentalprotection,sothestatementiscorrect.四、简答题1.参考答案：Asolarpowerplantconvertssunlightintoelectricityusingsolarpanels.Ittypicallyconsistsoflargearraysofphotovoltaiccellsthatcapturesolarenergyandconvertitintodirectcurrent(DC),whichisthentransformedintoalternatingcurrent(AC)foruseinhomesandbusinesses.Solarpowerplantsalsorequirestoragesystemstostoreexcessenergyforlateruse,makingthemareliablesourceofrenewableenergy.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于太阳能发电的写作能力。答案从太阳能发电的原理、组成结构、功能作用等方面进行了全面描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了太阳能发电作为可再生能源的重要性。2.参考答案：Windenergyisacleanandrenewablesourceofelectricitygeneration.Ituseswindturbinestoconvertthekineticenergyofwindintomechanicalenergy,whichisthenconvertedintoelectricity.Theadvantagesofwindenergyincludeitsenvironmentalfriendliness,asitproducesnogreenhousegasemissionsduringoperation,anditssustainability,aswindisavirtuallyinexhaustibleresource.Additionally,windenergycanbedeployedinvariouslocations,includingremoteareas,makingitaversatileoptionforelectricitygeneration.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于风能发电的写作能力。答案从风能发电的原理、优点、环境友好性、可持续性等方面进行了详细描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了风能发电作为一种清洁能源的重要性。3.参考答案：Waterconservationhelpsprotecttheenvironmentbyreducingthestrainonwaterresources.Itconserveswaterforfuturegenerations,ensurestheavailabilityofwaterforecosystems,andreducestheenergyrequiredforwatertreatmentanddistribution.Byusingwaterwisely,wecanminimizewaterpollution,preservebiodiversity,andmaintainthehealthofrivers,lakes,andwetlands.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于水资源保护的写作能力。答案从水资源保护的意义、作用、影响等方面进行了全面描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了水资源保护的重要性。4.参考答案：Plantingtreesinurbanareasisimportantforseveralreasons.Treesprovideshade,whichhelpsreducetheurbanheatislandeffectandlowersenergyconsumptionforcoolingbuildings.Theyalsoimproveairqualitybyabsorbingcarbondioxideandreleasingoxygen,andtheyhelppreventsoilerosion.Additionally,treesenhancetheaestheticvalueofcities,createhabitatsforwildlife,andcontributetotheoverallwell-beingofurbanresidents.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于城市植树造林写作能力。答案从城市植树造林的意义、作用、影响等方面进行了全面描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了城市植树造林的重要性。5.参考答案：Photosynthesisistheprocessbywhichplantsconvertsunlight,carbondioxide,andwaterintoglucoseandoxygen.Itoccursinthechloroplastsofplantcells,wherechlorophyllcapturessunlight.Theprocesscanbedividedintotwomainstages:thelight-dependentreactionsandthelight-independentreactions(Calvincycle).Duringthelight-dependentreactions,sunlightisusedtoproduceATPandNADPH,whicharethenusedintheCalvincycletoconvertcarbondioxideintoglucose.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于植物光合作用的写作能力。答案从光合作用的原理、过程、阶段等方面进行了详细描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了光合作用在植物生长中的重要性。6.参考答案：Reducingplasticwasteisimportantbecauseplastictakesalongtimetodecompose,oftenpollutinglandandwaterecosystems.Itcanharmwildlife,asanimalsmayingestplasticorbecomeentangledinit.Additionally,theproductionofplasticcontributestogreenhousegasemissionsandclimatechange.Byreducingplasticwaste,wecanprotecttheenvironment,conserveresources,andpromoteamoresustainablelifestyle.解析：本题考查《2026年浙江省杭州市外国语学校七年级英语第4单元写作专项训练习题及答案》中关于减少塑料垃圾写作能力。答案从塑料垃圾的危害、影响、解决方法等方面进行了全面描述，符合题目要求。解析详细说明了答案的构成和写作思路，并强调了减少塑料垃圾的重要性。7.参考答案：Renewableenergysources,suchassolar,wind,andhydroelectricpower,contributetosustainabledevelopmentbyprovidingcleanandabundantenergy.Theyreducerelianceonfossilfuels,whicharefinite