Unit7ThenaturalworldReadingII课件译林版英语八年级上册

初中英语译林版八上The

natural

worldReading(II)Unit7通过本课时的学习，学生能够：Learningobjectives通过知识点总结与练习，掌握与海洋生态系统相关的语言知识，实现知识的迁移运用。03通过完成填空练习，准确运用目标词汇和短语（如“behometo”“takein”等）。01通过小组讨论和问题回答，深入理解海洋生态系统的重要性及面临的问题，提升批判性思维和口语表达能力。02重点重点EcosystemsSummaryReadandretellThreeMajorEcosystemsCoverage:~71%ofEarth'ssurfaceFunctions:Produces70%O₂;ContinuouswatercirculationMetaphor:“Earth'sHeart”OceanCoverage:~6%ofEarth'slandFunctions:Homesfor40%plants/animals;Purifieswater;PreventsfloodsMetaphor:“Earth'sKidneys”WetlandCoverage:~1/3ofEarth'slandFunctions:AbsorbsCO₂;ProducesO₂;CleansairMetaphor:“Earth'sLungs”ForestBesidestheoceans,wetlandsandforests,whatotherecosystemsdoyouknow?Ialsoknowthegrasslandecosystem,thedesertecosystem,theriverecosystem,thelakeecosystem,

theurbanecosystemandagriculturalecosystem.FreetalkReadandcompleteCSimonislisteningtoapodcastabouttheoceanecosystem.Completethescriptwiththecorrectformsofthewordsandphrasesintheboxbelow.balancebehometosurfaceoxygengetridoftakein

storeroleThebiggestecosystemHellolisteners!WelcometoSciencewithDoctorTed.TodayI'Iltalktoyouaboutthebiggestecosystemonourplanet.talktosb.aboutsth.向某人谈论某事Readandcompletebalancebehometosurfaceoxygengetridoftakein

storeroleDoyouknowwhatitis?Yes,it'stheocean.Itcoversthelargestareaoftheearth's(1)__________andholds97%oftheearth'swater.It(2)__________manyanimalsandplants.Doyouknowthatsomeoftheplantsintheoceanproduce(3)__________fortheanimalslivingthere?What'smore,theoceancan(4)__________25%-30%ofcarbondioxideand(5)__________heat.surfaceishometooxygentakeinstoreReadandcompletebalancebehometosurfaceoxygengetridoftakein

storeroleItplaysanimportant(6)__________inslowingdownclimatechange.Sadly,we'refacingaseriousproblem:oceanpollution.Therearemillionsoftonsofplasticintheocean,andit'sverydifficultto(7)__________it.It'stimeforustotakeactionandprotecttheocean.rolegetridof“减速”=alotof/lotsof大量的Readandcompletebalancebehometosurfaceoxygengetridoftakein

storerole长难句分析：这是一个复合句。主句主语是theplastic，谓语是willharm，宾语是thebalance，oftheoceanecosystem是介词短语作后置定语；从句是由If引导的条件状语从句。Ifwedon't,theplasticwillharmthe(8)__________oftheoceanecosystem.balance长难句分析Thinkandshare1.Whyarethethreeecosystemsimportantfortheearth?Ocean:Providesoxygen,regulatesclimate,supportsmarinelife.Wetland:Protectsbiodiversity,purifieswater,preventsfloods.Forest:Cleansair,producesoxygen,maintainsatmospherebalance.Thinkaboutthequestionsbelow.Shareyouranswerswithyourclassmates.ThinkandshareNon-livingthings:Water,air,sunlight,soil.Importance:Essentialforlivingthings(e.g.,waterforsurvival,sunlightforplants’photosynthesis).2.Whataresomeofthenon-livingthingsinanecosystem?Arethey

important?Givereasons.Thinkandshare3.Howdohumanactivitiesaffecttheecosystems?Giveanexample.Negativeeffect:Industrialwastepollutesoceans,killingmarinelife.Ordeforestationreducesforestarea,breakingecologicalbalance.Exampleharm可以作动词或名词，意为“伤害；损害”，其形容词形式是harmful，意为“有害的”。doharmto意为“对……有害”；

beharmfulto意为“对……有害”

两个短语后面都接名词或代词宾格作宾语。1.harm/hɑːm/vt.&n.伤害，损害Languagepoints1.Manypeopleworrythattoomuchscreentimewill________(harm)theirchildren.2.Fireis________(harm).Keepyourchildrenawayfromit.3.喝太多果汁对儿童的牙齿有害。Drinkingtoomuchjuicecan_____________________children’steeth.harmharmfuldoharmtobeharmfultoLet’spracticegetridof意为“清除；摆脱；丢弃”，表示清除某种不良影响；摆脱某人或某种困境；丢弃不想要的物品等。2.getridof

清除；摆脱Languagepoints1.Hethrewawaytheclothesbecausetheyareold.

（选出同义短语）______A.lookedoutof

B.tookcare

C.gotridof

D.keptaway2.我们必须要清除这个地区的污染。Wemust________________________

thepollutioninthisarea.CgetridLet’spracticeofmakeup的意思主要有：(2)编造故事或借口；(3)组成(一个集体或团队)；(4)化妆；打扮3.makeup占据(某种比例)Languagepoints(1)占据总量中的一定分量；1.Thebigbed______almosthalfofherbedroom.A.cutsup B.putsupC.turnsup D.makesup2.尽管你迟到了，可是你不应当编造借口。Althoughyouwerelate,youshouldn’t

________________excuses.DmakeupLet’spracticehundred(百)、thousand(千)、million(百万)都是表示数量的词，它们的用法是：表示具体数量时不使用复数，表示笼统数量时要使用复数，且后面要加介词of。4.millionsof数以百万计的Languagepoints1.

Peopleplant______treesonTreePlantingDayeveryyear.A.hundred B.hundredsofC.hundreds D.hundredof2.冬天，数以百万计的鸟儿飞向南方。Inwinter,________________birdsfly

tothesouth.BmillionsofLet’spractice5.It’stimeforustotakeactionandprotecttheocean.

是我们采取行动和保护海洋的时候了。Languagepoints分析结构“It’stime(forsb.)+动词不定式.”是一种常用的句式结构，意为“（某人）该做某事了”。也可以直接使用“It’stimefor+名词”。1.It’stimeforgovernments______actionagainstclimate