冀教八下英語Unit 5《Lesson 5》課件

Lesson5Unit5Greatinventions1Readthetimelineandticktheinventorofthefirstrefrigerator.Ancienttimes:AncientChina,Greece,andRomeusediceorsnowtopreservefoodbyfreezingorchillingit.1600s:Icehouseswereusedtopreservefoodallyear-round.1748:WilliamCullendidanexperimentonartificialrefrigeration.1805:OliverEvansdesignedthefirstrefrigerationmachine.1890s:Iceboxesbecamepopular.Theyweresmallericehousesmeantforhomesinthecity.bemeantforsb./sth.為某人/某物而設計bemeanttodosth.應該做某事；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/fri?z/v.冰凍；(使)結冰(教材P66)·Waterfreezesat0℃.水在0攝氏度時結冰。·InearlyfrozewhenIwentoutwithoutacoat.我沒穿外套出門，差點凍僵了?！ycomputerfrozeupwhileIwaseditingthevideo.我編輯視頻時電腦突然死機了。探究一核心單詞·Wewenticeskatingonafrozenlake.我們去結冰的湖面上溜冰了?！ewereforcedtoworkoutsideinfreezingconditions.我們被迫在戶外天寒地凍的環境下工作。freeze作不及物動詞時，指液體“結冰”或人“極冷”；作及物動詞時，意為“使凍結；使結冰”。其過去式為froze，過去分詞為frozen。freeze可表示“(因寒冷或恐懼)凍僵；呆住”。常見搭配：freezeup(機器等)凍住/停止運轉；(人)變得冷淡相關詞匯：frozenadj.冷凍的；結冰的freezingadj.極冷的2energy/'en?d?i/n.能源；能量(教材P66)·Solarenergyisacleanandrenewableresource.太陽能是一種清潔的可再生資源。·Foodprovidesuswithenergy.食物為我們提供能量?！he’salwaysfullofenergy.她總是充滿活力。energy的一詞多義：(1)作“能源”講時，指電力、燃料等可利用的能源，為不可數名詞。(2)作“能量”講時，指物理概念或人體活動所需的精力，為不可數名詞。常見搭配：takeenergy