初中九年級英語課件Lesson5 Lets Do an Experiment

Lesson25Let’sDoanExperiment!Newwordsexperimentn.實驗；試驗jarn.廣口瓶upsiden.上部；上邊pourv.倒出；傾倒correctadj.正確的；恰當的scientificadj.科學的methodn.方法；辦法raincoatn.雨衣forcen.力量v.迫使；強迫pressuren.壓力，壓強；擠壓concludev.得出結論；斷定；推斷出Newphrasesturn…upsidedown把......翻轉；倒過來pourout涌出scientificmethod科學方法take…off把......拿開

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Lesson25:Let’sDoanExperiment!Danny,JennyandBrainareinthelab.Brain:Let’sdoanexperiment.Ifillajarwithwater.Icoverthetopwithapieceofcardboardandholditthere.ThenIturnthejarupsidedownandtakemyhandoffthecarboard.Canyouguesswhatwillhappen?Danny:Ithinkthefloorwillgetwet.Weshoulddothisexperimentoutside,Brian.Jenny:Ithinkthecardboardwillholdthewater.Danny:Idon’tthinkso.Jenny:Youthinkthewaterwillpourout,Danny.Ithinkthewaterwillstayinthejar.Let’stestwhichtheoryiscorrect.Brian:Goodidea,Jenny.That’scalledthesicentificmethod.Jenny:IamsosureofmytheorythatBriancandotheexperimentoveryourheadandIknowyouwon’tgetwet.Danny：Well,let’stryit!Brian:Areyouready,Danny?Danny:No！Wait!(Heputsonaraincoatandsitsdown.)NowIthinkI’mready.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.我用水把瓶子裝滿。fill…with…用……裝滿……(主語是人)befullof…/befilledwith…(主語是物或容器)Learnthenewlesson二.Iturnthejarupsidedown.

我把廣口瓶倒置。三、I’msurethefloorwon’tgetwet.我確信地板不會濕。besure表示肯定,有把握,而benotsure表示不確定besure/benotsure后可接句子，還可接代詞、名詞、動名詞或不定式。Summary1、Ifillajarwithwater.我用水把瓶子裝滿。2、Iturn