2023学年完整公开课版Keepthecandleburning

Lesson26:

KeeptheCandleBurning!ThinkaboutitDoyouthinkscienceisinteresting?Whyorwhynot?Whatwillhappenifyouputajarupsidedownoveraburningcandle?Newwordsshallowadj.浅的matchn.火柴examinev.检查oxygenn.氧气lighter打火机candleholdern.蜡烛座useupbemadeupofmatchburnCandleholdern.Scienceissointeresting!I’msureyou’lllikethisexperiment!Whatdoyouneed?AcandleAcandleholderAbigglassjarAshallowdishSomewatermatchesWhatdoyoudo?

1.Putthecandleinthecandleholder.2.Putthecandleholderinthedish.3.Fillthedishhalffullwithwater.4.lightthecandle.5.letthecandleburnfortwoorthreeminutes.6.carefullyputthejaroverthecandleuntilthetopofthejarrestsonthedish.7.Examinethewaterinthejar.WhatcanyouSee?Whatishappening?Asthecandleburns,itusestheoxygenintheair.Whenthecandlestopsburning,ithasusedupalltheoxygenintheair.Thewaterinsidethejarrises.Howfardoesthewaterrise?Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.Keepthecandleburning!让蜡烛燃烧！keep…burning使……燃烧。keepsth.(sb.)doing,使某物（某人）保持做某一动作。Don’tkeepthewaterfalling.不要再让水继续流了。Shekeptmeholdingthejarwithmyhand.她让我一直用手握住瓶子。Doyouthinkscienceisinteresting?你认为自然有趣吗？scientist自然科学，科学家。Scientific科学的Iboughtabookonsciencelastweek.我That’scalledthescientificmethod.Wearelearningtheknowledgeaboutscience.WangPenglovesscienceverymuch.Hewantstobeascientist.ashallowdish一个浅的盘子shallowadj.浅的。其反义词是：deep深的。Pleasepassmeashallowdish(plate).请递给我一个浅盘子。Theideaofthepassageisveryshallow.Icanunderstandit.这篇短文的意思很浅显，我能读懂它。lightthecandle点亮蜡烛，意同makethecandleburn，使蜡烛燃烧。1)lightn.光，光线。为不可数名词；电灯。Themoonlightcomesintotheroomthroughthewindow.Don’tforgettoturnoffthelightswhenyouleave.2)lightadj.颜色浅的，（反义词dark）；（分量）轻的，（反义词heavy）Roselikesthelightgreenskirt.。Thebagisverylight.Marycancarryiteasily.3)lightv.点燃，照亮。It’stimetolightup.It’scoldintheroom.Let’slightafire.Carefullyputthejaroverthecandle.小心地把瓶子倒扣在蜡烛上。carefullyadv.仔细地，认真地，小心地。caren.细心。细心的，认真的。注意这三个词的关系care(n.)+ful=careful(adj.)direful(adj.)+ly=carefully(adv.)。Jennyisacarefulgirl.Shedoeseverythingcarefully.詹妮是一个认真的女孩。她做任何事情都非常仔细。Brianputhejaronthetablecarefully.布莱恩小心地把瓶子放在桌子上。Asthecandleburns,itusesupoxygenintheair.当蜡烛燃烧的时候，需要消耗空气中的氧气。1)as在本文中的意义为“当……的时候”。是一个有着多重意义的词。PleasedoitagainasIdid.请像我做的那样再做一遍。（as像……一样）Asitislate,Ihavetoleavenow.由于天太晚了，我得走了。（as由于，因为）Youwillfindthebuildingasyoureachtheendofthestreet.当你走到这条街那头，你就会看到那座大楼。（as当……时候）2)useup用光，耗尽。表示完全，彻底。Hewashungryandateupthebread.他饿了，把面包全吃光了。（eatup吃光）Jimuseduphismoneytobuythecomputer.吉姆为了买电脑花光了所有的钱。Thewaterinsidethejarthenrises.这时瓶子里的水就会上升。risev.上升，升起。这是一个不及物动词。Thesunrisesintheeast.太阳在东方升起。Theriverisrisingaftertheheavyrain.大雨后河水上涨。Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.氧气在空气中占五分之一，所以水面上升并且占据了瓶子的五分之一。one-fifth五分之一。我们来归纳一下分数的表达：分数由分子及分母两部分构成。用英语表达时，分子用基数形式，分母用序数词形式。若分子为1时，则分母的序数词为单数形式，若分子大于1时，则分母的序数词用复数形式。如：1/3，onethird,三分之一1/5,onefifth,五分之一3/4,threefourths,四分之三