Lesson25Let’sDoanExperiment!.pptx

Lesson25：LetsDoanExperiment!,左贡县中学贺陈敖,Newwords,experimentn.实验；试验jarn.广口瓶upsiden.上部；上边pourv.倒出；倾倒correctadj.正确的；恰当的scientificadj.科学的methodn.方法；办法raincoatn.雨衣forcen.力量v.迫使；强迫pressuren.压力，压强；挤压concludev.得出结论；断定；推断出,Newphrases,turnupsidedown把.翻转；倒过来pourout涌出scientificmethod科学方法takeoff把.拿开,Listenandread,Lesson25:LetsDoanExperiment!Danny,JennyandBrainareinthelab.Brain:Letsdoanexperiment.Ifillajarwithwater.Icoverthetopwithapieceofcardboardandholditthere.ThenIturnthejarupsidedownandtakemyhandoffthecarboard.Canyouguesswhatwillhappen?Danny:Ithinkthefloorwillgetwet.Weshoulddothisexperimentoutside,Brian.Jenny:Ithinkthecardboardwillholdthewater.Danny:Idontthinkso.Jenny:Youthinkthewaterwillpourout,Danny.Ithinkthewaterwillstayinthejar.Letstestwhichtheoryiscorrect.Brian:Goodidea,Jenny.Thatscalledthesicentificmethod.,Jenny:IamsosureofmytheorythatBriancandotheexperimentoveryourheadandIknowyouwontgetwet.Danny：Well,letstryit!Brian:Areyouready,Danny?Danny:No！Wait!(Heputsonaraincoatandsitsdown.)NowIthinkImready.Jenny:Brian,takeyourhandoffthecardboard.Danny:No!(Dannycloseshiseyestightly,andBriantakeshishandoffthecardboard.Thewaterstaysinthejar.)Jenny:See,Danny?Danny:Howisthatpossible?Brian:Theforceoftheairkeepsthewaterinthejar.Itisstrongenoughtoholdthewater.,Danny:Wow!Brian:Sowhathavewediscovered?Jenny：Wehavediscoveredthattheairpressurehelpsthecardboardwaterinthejar.Brian:Right.Whatdoyouconclude,Danny?Danny:IconcludethatairisstrongerthanIthought.,一、Ifillajarwithwater.我用水把瓶子装满。,fillwith用装满(主语是人)befullof/befilledwith(主语是物或容器),Learnthenewlesson,二.Iturnthejarupsidedown.我把广口瓶倒置。,三、Imsurethefloorwontgetwet.我确信地板不会湿。besure表示肯定,有把握,而benotsure表示不确定besure/benotsure后可接句子，还可接代词、名词、动名词或不定式。,Summary,1、Ifillajarwithwater.我用水把瓶子装满。2、It