九年级英语上册Unit5LookintoScienceLesson25Let’sDoanExperiment教学冀教版.ppt

,Unit5LookintoScience,Lesson25LetsDoanExperiment,1.Doyoulikescience?,2.Whatkindsofexperimentshaveyoudoneinscienceclass?,3.Ifyouholdajarthatisfilledwithwaterupsidedown,whatwillhappen?,upsidedown,a,a,倒置的，颠倒的,rightsideup,a,正面朝上,upside,a,上边，上部,science,a,科学,adj.,scientific,a,doanexperiment,做实验,Whatcantheydo?,jar,:,广口瓶，罐子,fill,装满,Howmanystrawberries?,observe,：,观察，监视,Whatshedoing?,ing,prove证实;证明method方法;办法,Listentothetapeandanswerthequestions:,1.WhatwillBraindo?2.WhydoesDannysaytheyshoulddothisexperimentoutside?,Brainwilldoanexperiment,BecauseDannythinksthefloorwillgetwet.,Ithink:“我认为”,其后可接that引导的宾语从句。在使用时要注意，否定主句,反问从句。getwet意为“变湿”。后接形容词作表语。pourout：“倒出,使流出,涌出”。pourinto：“把倒进”。besureof：“确信；对有把握”puton：“穿上”,为“动词+副词”构成的短语。,“Itis+形容词+enoughtodosth.”“做某事是足够的”。=tooto=sothat。concludefrom意为“从推断,从中得出”。,find,findout,discover,invent(1)find意为“找到,发现”,强调“找”的结果,也可指偶然发现、碰到,其后可接名词、复合结构或that从句。(2)findout指“弄清楚,查明”。着重表示通过调查、分析、思考等得出结果。(3)discover意为“发现”,指发现已存在但不为人所知的事物。(4)invent意为“发明”,指发明原来不存在的东西。,(1)WheredoesDannythinktheyshoulddotheexperiment?(2)Whatkeepsthewaterinthejar?(3)IsJennysureofhertheory?Howdoyouknow?(4)WhydoesDannyputonhisraincoat?(5)WhatdoesDannyconclude?,Readthelessonandanswerthequestions.,Dannythinksthattheyshoulddotheexperimentoutside.,Theforceoftheair./Theairpressure.,Yes,sheis.SheissosureofhertheorythatBriancandotheexperimentoverDannysheadandhewontgetwet.,Becausehethinkshewillgetwet.,Airisstrongerthanhethought.,Putapieceofcardboardoverthejar.Thejarofwaterisupsidedown,butthewaterstaysinthejar.Thisisbecauseairpressurepushesthecardboardontothejar.Filltheglassjarwithwater.Turntheglassjaroverquickly.Holdyourhandonthecardboardforafewseconds.Removeyourhandfromunderneaththejar.Whathappens?Thereismoreairoutsidethejarthaninside,sothereismoreairpressureoutsidethaninside.,Readtheexperiment.Putthesentenceinthecorrectorder.,2,5,1,3,4,6,Whathappenswhenyouuselesswater,morewater,wetcardboard,ordifferentkindsandsizesofjars?,Trytodotheexperimentinthislessonyourself.,1.Makealistofthematerialsandtoolsthatwewilluseintheexperiment.,2.Writedowntwodifferenttheories.,Retelltheprocessoftheexperiment.,3.Writedownthestepsofdoingtheexperiment.,4.Writedowntheresultoftheexperiment.,Summarytheexperiment.,Howdowedotheexperiment?Letsdoaninterestingexperiment.First,I_ajar_adesk,_it_water,then_thetop_apieceofcardboard.WhenI_thejar_,canyouguesswhatwillhappen?,down,put,on,fill,with,cover,with,turn,upside,Whatisscience?Whatisscience?Canyouexplain?Pleasemakeiteasyformybrain.Itsaboutmakingobservations.Whydoonionsmakemecry?Whydocloudsgoby?Whatkeepsthebirdsinthesky?Thatsjustscience.Itsaboutmattertheuniverse.Whydoesacarsta