冀教八下英语Unit 5《Lesson 5》课件

Lesson5Unit5Greatinventions1Readthetimelineandticktheinventorofthefirstrefrigerator.Ancienttimes:AncientChina,Greece,andRomeusediceorsnowtopreservefoodbyfreezingorchillingit.1600s:Icehouseswereusedtopreservefoodallyear-round.1748:WilliamCullendidanexperimentonartificialrefrigeration.1805:OliverEvansdesignedthefirstrefrigerationmachine.1890s:Iceboxesbecamepopular.Theyweresmallericehousesmeantforhomesinthecity.bemeantforsb./sth.为某人/某物而设计bemeanttodosth.应该做某事；目的是做某事1913:FredW.Wolfinventedthefirsthomeelectricrefrigerator.1918:Massproductionofhomerefrigeratorsbegan.1920s:Refrigeratorsbecamepopularinsomecountries.1940s:Freezercompartmentswereadded.1980s:Waterdispenserswereadded.1996:Refrigeratorsbecamemoreenergy-saving.□WilliamCullen□OliverEvans□FredW.Wolf√2Readthetimelineagainandcirclethecorrectanswers.AWhendidrefrigeratorsbecomepopularinhomes?a.Inthe1920s.b.Inthe1800s.c.Inthe1980s.BWhatisthecurrentstateofusingrefrigerators?a.Arefrigeratorisconsideredaluxuryitem.b.Therunningcostofarefrigeratorissohighthatnoonecanaffordit.c.Energy-efficientrefrigeratorshavebecomethenewnormal.√√3Workingroups.Makeatimelinetogetherforaninvention.ADiscussandchooseaninvention.·Searchtheinternet,checkoutbooksfromthelibrary,orvisitamuseumrelatedtoyourtopic.·Chooseaninventionandsharetheinformationyouhavegathered.·Makealistofeventsaboutthatinvention.B

Creatingaframework·Drawyourtimeline.·Chooseastartandendpoint.·Putthemostimportantdatesonthetimeline.CFillinginyourtimeline·Adddetailsandimportantinformationabouteachevent.·Writeclearlyandconcisely.·Addpictures.4Usethetimelinetointroducetheinventiontoyourclass.1freeze/friːz/v.冰冻；(使)结冰(教材P66)·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。探究一核心单词·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。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2energy/'enədʒi/n.能源；能量(教材P66)·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。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：takeenergy