八年级英语Look into Science课件3.ppt

,Lesson30KeeptheCandleBurning!,.Learningaims:,知识目标Masterthenewwords:match,light,burn,useup,shallow,candleholder,oxygen,one-fifth2)Theimportantsentences:Fillthedishhalffullofwater.Asthecandleburns,itusesupoxygenintheair.Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.,.教学重点：1.DescribeandexplaintheexperimentinEnglish.2.分数的表达法.教学难点:DescribeandexplaintheexperimentinEnglish.,能力目标：candescribeandexplaintheexperimentinEnglish情感目标：Cultivatethespiritoflovingscience.,预习早知道1.match(pl)-_light(过去式）_(过去分词）_burn（过去式）_(过去分词）_v.燃烧useupone-fifthshallow(反义词）_half(pl)_,matches,n.火柴;比赛,lighted/lit,lighted/lit,v.点燃;使燃烧/照亮;使光明,burned/t,用完；用光；,五分之一,burned/t,deep,halves,LookandLearn,1.Whatarethey?Theyare_Theyareusedto_something.Iwillusethem_acandle.Iam_thecandlewiththematch.Myfatheroftenusesmatches_hissmoke.2.Thisafternoonwellhaveabasketball_.,matches,light,tolight,lighting,tolight,match,-Becauseburningneeds_.whenthecandlestopsbuirning,ithas_alltheoxygeninthejar.(_:Theyhave_allthewater.),Whatsthis?Itsa_.Itsa_candle.IfIputthejarovertheburningcandle,whatwillhappen?,-Itwillgoout/stop_why?,candle,burning,burning,oxygen,used,up,useup,usedup,一.自主探究，合作学习,1.He_thespoon_thebowl.他把汤匙放到了碗里面。2.Lily_thebottle_water.Lily把瓶子装满了水。3.Theroom_smoking.屋子里充满了烟。4.Pleaseputthejar_thecandle.请把罐子放到蜡烛的上面。5.Mymother_hermoneytobuyclothingyesterday.我妈妈昨天买衣服花光(用光）了她身上所有的钱。6.Inourclass,_studentsareboys,_studentsaregirls.在我们班，三分之二的学生是男生，三分之一的学生是女生。二.小组合作操练，用上述新知识点造句，并在小组内核对，交流。,put,in,filled,with,isfullof/isfilledwith,over,usedup,two-thirds,one-third,分数表达法分子基分母序分子大于1分母加S,One-fifthfourfifthsone-thirdtwo-thirds,1/54/51/32/3,基数词,序数词,分子,分母,5/9,Practise,1/4,one-fourth,3/7,three-sevenths,.Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.,aquarter,five-ninths,强化训练,单项选择1.Thebottleisonly_full.A.halfB.ahalfC.halfsD.halves2.She_thechickenbonestomakesoup.A.UsedforB.usedtoC.usedupD.usedwith3._ofthestudentsinourschool_fromcountryside.(乡村）A.Four-fifths,comesB.Fourth-five,comeC.Four-fifth,comeD.Four-fifths,come4._ofwater_.A.Three-fourths,areB.Three-four，isC.Three-quarters，isD.Three-fourth,is4.Theriveris_here;wecanwalkacross.A.deepB.fastC.shallow5.Yellowisa_colour,butblackisdark.A.orangeB.lightC.heavy,A,C,D,C,C,B,First._thecandle_thecandleholder.Then._thecandleholder_thedish.Third._thedish_water.Fourth._thecandle.Fifth._thecandle_fortwominutes.Sixth.carefully_thejar_thecandleuntilthetopofthejar_onthedish.Whatobservationcanyoumake?,Howdowedotheexperiment,put,put,in,in,Fill,halffullof,Light,let,burn,put,over,rests,1.Whydidthecandlestopburning?becausetherewas_oxygeninthejar.2.Whydidthewaterrise?Theforceoutsidethejaris_thantheforceinsidethejar.,3.Howfardidthewaterrise?Why?Itroseabout_ofthejar.Becausethereisone-fifthoxygeninthe_.,no,stronger,one-fifth,air,summary,Thenewwords:match,light,burn,shallow,candleholder,oxygen,Thephrasesandexpressions:useup,one-fifth,keepsb/sthdoing,keepsth/sb+adjStopdoing/todosth,put.in/over分数的表达：分子基，分母序，分子大于1，分母加SsentencesFillthedishhalffullofwater.Asthecandleburns,itusesupoxygenintheair.Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.Howdo“keepthecandleburning”,用所给单词的正确形式填空：1.Youareverytired.Youdbetterstop_(have)arest.2.Whatdoyouusetomakeacandle_(burn)?3.Youshouldputthejaroverthecandle_(careful).4.What_(observe)canyoumake?5.Pleasecuttheappleinto_(half).6.He_(light)acandleandtheroomwasbright.7.Hekeptthecandle_(burn)fortwohours.8.Itstime_(play)basketball.9.Eatinggreenfoodcanhelptokeepyou_（health）.10.Imsorry,Ikeptyou_(wait)foralongtime.,tohave,burn,carefully,observation(s),halves