Unit+5+Lesson+5课件2025-2026学年冀教版英语八年级下册

Lesson5ComputersandtheinternetUnit5Greatinventions学习目标123能够掌握本课时单词和短语。能够从发明的时间线中找出关键节点信息（如时间、人物/发明者、事件与变化），并用时间顺序梳理“发明—改进—普及”的发展脉络，形成对技术演变的整体认识；能够小组协作选择一种发明，制作出结构清晰、图文结合的时间线作品，并进行口头介绍与分享。Whatisit?Isthereanyinyourfamily?Whatthingsdoyouusuallyputintoit?Whatinformationdoyouknowaboutit?LeadinAncienttimes:AncientChina,Greece,andRomeusediceorsnowtopreservefoodbyfreezingorchillingit.1600s:Icehouseswereusedtopreservefoodallyearround.1748:WilliamCullendidanexperimentonartificialrefrigeration.1805:OliverEvansdesignedthefirstrefrigerationmachine.1890s:Iceboxesbecamepopular.Theyweresmallericehousesmeantforhomeuse.新课讲授Reading1913:FredW.Wolfinventedthefirsthomeelectricrefrigerator.1918:Massproductionofhomerefrigeratorsbegan.1920s:Refrigeratorsbecamepopularinsomecountries.1940s:Freezercompartmentswereadded.1980s:Waterdispenserswereadded.1996:Refrigeratorsbecamemoreenergy-saving.√1Readthetimelineandticktheinventorofthefirstrefrigerator.□WilliamCullen□OliverEvans□Fred.W.Wolf2Readthetimelineagainandcirclethecorrectanswers.AWhendidrefrigeratorsbecomepopularinsomecountries?a.Inthe1920sb.Inthe1800s.c.Inthe1980sBWhatwastrueaboutusingrefrigeratorsinthe1990s?a.Arefrigeratorwasconsideredaluxuryitem.b.Therunningcostofarefrigeratorissohighthatnoonecouldaffordone.c.Energy-efficientrefrigeratorshadbecomethenewnormalReadthetimelineforthethirdtimeandcompletethemindmapbelow.Ancienttimes17481890s19181940s19961600s1805191319201980sReadthetimelinecarefullyandcompletetheshortpassage.Therefrigeratorisimportantinourdailylife.Letmeintroducethedevelopmentofit.Inancienttimes,AncientChina,Greece,andRomeused______or______topreservefoodby______and______it.Inthe1600s,_________wereusedtopreservefoodallyear-round.In1748,WilliamCullendidanexperimentonartificialrefrigeration.In______,OliverEvansdesignedthefirstrefrigerationmachine.Inthe1890s,iceboxesbecame_______.Theyweresmallericehousesmeantforhomeuse.In1913,FredW.Wolf______thefirsthomeelectricrefrigerator.In1918,massproductionofhomerefrigeratorsbegan.Inthe1920s,refrigeratorsbecamepopularinsomecountries.Inthe1940s,______compartmentswereadded.Inthe1980s,waterdispenserswereadded.In1996,refrigeratorsbecamemore______-saving.icesnowfreezingchillingicehouses1805popularinventedfreezerenergyLanguagepoints1.AncientChina,Greece,andRomeusediceorsnowtopreservefoodbyfreezingorchillingit.古代中国、希腊和罗马用冰或雪通过冷冻或冷藏来保存食物。freeze作不及物动词时，指液体“结冰”或人“极冷”；作及物动词时，意为“使冻结；使结冰”。其过去式为froze，过去分词为frozen。freeze可表示“(因寒冷或恐惧)冻僵；呆住”。常见搭配：freezeup(机器等)冻住/停止运转；(人)变得冷淡相关词汇：frozenadj.冷冻的；结冰的freezingadj.极冷的e.g.Waterfreezesat0℃.水在0摄氏度时结冰。InearlyfrozewhenIwentoutwithoutacoat.我没穿外套出门，差点冻僵了。MycomputerfrozeupwhileIwaseditingthevideo.我编辑视频时电脑突然死机了。Wewenticeskatingonafrozenlake.我们去结冰的湖面上溜冰了。Wewereforcedtoworkoutsideinfreezingconditions.我们被迫在户外天寒地冻的环境下工作。2.Theyweresmallericehousesmeantforhomesinthecity.bemeantforsb./sth.为某人/某物而设计bemeanttodosth.应该做某事；目的是做某事e.g.Thebookismeantforbeginners.这本书是为初学者准备的。Thesoftwareismeanttoprotectcomputersfromviruses.

该软件旨在保护电脑免受病毒攻击。）3.Refrigeratorsbecamemoreenergy-saving.冰箱变得更加节能。energy的一词多义：(1)作“能源”讲时，指电力、燃料等可利用的能源，为不可数名词。(2)作“能量”讲时，指物理概念或人体活动所需的精力，为不可数名词。常见搭配：takeenergyfrom从……吸取能量saveenergy节约能源solarenergy太阳能相关词汇：energeticadj.精力充沛的e.g.Solarenergyisacleanandrenewableresource.太阳能是一种清洁的可再生资源。Foodprovidesuswithenergy.食物为我们提供能量。She’salwaysfullofenergy.她总是充满活力。3Workingroups.Makeatimelinetogetherforaninvention.ADiscussandchooseaninvention.·Searchtheinternet,checkoutbooksfromthelibrary,orvisitamuseumrelatedtoyourtopic.·Chooseaninventionandsharetheinformationyouhavegathered.·Makealistofeventsaboutthatinvention.BCreateaframework·Drawyourtimeline.·Chooseastartandendpoint.·Putthemostimportantdatesonthetimeline.CFillinyourtimeline·Adddetailsandimportantinformationabouteachevent.·Writeclearlyandconcisely.·Addpictures.Gro