初中九年级英语课件Lesson5 Let's Do an Experiment

Lesson25Let’sDoanExperiment!唐山市第四十五中学岳光奇冀教版九年级

(n.)jar[dʒɑː]apieceofcardboard广口瓶、罐子abottleofwater

Doanexperimentwith

thescientificmethod.

1.Fillthejarwithwater.(用…...把…...装满）Ifillthejarwithwater.

(同意转换)Thejar_______________waterbyme.wasfilledwithbefilledwith=befullof

装满…...

2.Coverthetopwithapieceofcardboard

andholdit.（用…...覆盖…...）Thetop_______________apieceofcardboard___me.Icoverthetopwith

apieceofcardboard.(同意转换)wascoveredwithbybecoveredwith被…...覆盖

3.Turnthejarupsidedownandtakemyhandoffthecardboard.（把…...翻转）（把…...从…...拿开）(1)turn

...

upsidedown

=turn...over

(2)take…off…把…...从…...拿开He______thecover_____theteapot.（n.盖子）（n.茶壶）tookoff

Thewaterdoesn'tpourout.Theforceoftheairkeepsthewaterinthejar.Itisstrongenoughtoholdthewater.AirisstrongerthanIthought.

Let’sdotheExperiment!1.Fillthejarwithwater.3.Turnthejarupsidedownandtakemyhandoffthecardboard.2.Coverthetopwithapieceofcardboardandholdit.Thewaterdoesn'tpourout.Theforceoftheairkeepsthewaterinthejar.Itisstrongenoughtoholdthewater.AirisstrongerthanIthought.

Listenandanswerthequestions:1.WhydoesDannyputonhisraincoat?2.Whatkeepsthewaterinthejar?3.WhatdoesDannyconclude?Becausehethinkshewillgetwet.Theforceoftheair./Theairpressure.Airisstrongerthanhethought.

Exercises()1.Couldyouhelpmefillthebasket______apples?A.onB.inC.ofD.with()2.Iam______theweatherwillbefinetomorrow.A.thinkB.sureC.hopeD.see()3.“Allovertheworld”is_____wayof_____“aroundtheworld”.A.other;sayingB.another;sayC.another;sayingD.theother;saying()4.Heworks_____thanIthink.A.hardB.harderC.hardestD.hardly()5.Thispairofjeansisdifferent______thatone.A.toB.withC.onD.from()6.Don’tlaugh_____yourclassmateswhenthey_____mistakes.A.at;makeB.at;madeC.to;makeD.with;have()7.–What’sthetrouble,doctor?--Don’tworry.Thereis_____withyou.You’llbebettersoon.A.somethingmuchwrongB.anythingmuchwrongC.muchwrongnothingD.nothingmuchwrongD