八年级英语A-dangerous-servantPPT课件

Electricity,8BChapter4,Adangerousservant,8BChapter3,1.Whatdoyouthinkofelectricity?Why?2.Electricitygivespowerforallkindsofelectricalappliances.Canyounamesomeoftheelectricalappliancesweuseinourlives?(Whenwepluganapplianceintothewallsocket,weareusingelectricityproducedbyagenerator.),electricalappliances,anairconditioner,ablender,aCDplayer,acomputer,acooker,ahairdryer,alamp,akettle,electricalappliances,aheater,afan,aniron,amicrowave,anoven,aprinter,electricalappliances,arecorder,arefrigerator,aTVset,avacuumcleaner,avideoplayer,awashingmachine,amobilephone,(afridge),arobot,Wheredoesarobotsenergycomefrom?,Itsenergycomesfromelectricity.,Wheredoesourenergycomefrom?,(Energyisthepowerthatmakesthingswork.),Perhapswithoutelectricityourliveswillnotbeinteresting.Nowletustalkaboutelectricity.Whatisit?Electricityisthepowerwhichisproducedbyrubbing(friction),byamachinecalledageneratororbychemicalmeans(e.g.abattery).Canweseeit?No,itsakindofenergythatwecannotsee.Itsinvisible.Canwetouchit?No,wecant.Wemaygetanelectricshock.Itsdangerous.,Powerstations,pylons,home,Doyouknowhowelectricitycomestous?,Thepylonscarrywires.,Wirescarryelectricity.,Electricitycomesintoourflatsthroughthinwires,andthethinwiresareconnectedtothickwires.Thethickwiresarecalledcablesandtheyareburiedunderground.Cablesareconnectedtopowerstations.Powerstationsmakeelectricity.,Homework:Gooverthevocabularyitemsandrecitethem.Listentotherecordingofthearticleandreaditaloudseveraltimes.FinishEx.C/D/Eonpage46,47.,Electricity,8BChapter4,Adangerousservant,8BChapter3,Ex.Fillintheblankswithproperwords:,wireenergycableshock,1.Youngpeoplehavemorethanoldpeople.2.Donttouchthe!Youllgetanelectric.3.Whentheworkersweredigginguptheroad,theycutthe,andasaresult,therewasablackoutinthearea.,athreadofmetalthepowerthatmakesthingsworkathick,strongropemadeofwireaverystrongforceorblowaperiodofdarknesscausedbyacutintheelectricitysupply,Wecanchangeelectricityintoenergythatwecansee,hear,orfeel.Wecanalsochangeitintoenergythatmovethings.,lightenergysoundenergyheatenergymovementenergy,(movement-movingorbeingmoved),Canyoutellwhatkind(s)ofenergydotheyproduce?,Vocabulary,electricityn.electrica.电的，电动的，发电的electriccables电缆anelectrickettle电壶electriccurrent电流electricala.电的，电气科学的electricalappliances电器anelectricalengineer电气工程师electriciann.电工，电学家Ifanyoftheelectricalappliancesorthewiringinyourhomeisoutoforder,youneedtofindanelectriciantorepairthem.,1)Whendidthestoryhappen?2)BennydidntwanttotrickDaisy,didhe?3)DoesBennyknowwhatelectricityis?4)Whymustwebecarefulwithelectricity?5)Howdoeselectricitycomeintoourhomes?6)Whatarethewiresconnectedto?7)WhatdidDaisybuyforherbrother?8)DoesDaisyknowwhatelectricityis?9)Howdobatterieswork?10)WhatdoyouthinkofBennyandDaisy?,Readaloudthearticleandanswerthefollowingquestions:,Completethesentences:1)Itstotouchtheelectricitywithyourhand.(danger)2)Wecanbuysugarin.(pack)3)Hehadnoforwhyhewaslate.(explain)4)Water.hasthree-solid,liquidandgas.(form)5)Thethiefthetreasureunderthetree.(bury)6)Intheolddays,therichusuallyaskedtodothehouseworkforthem.(serve)7)Timworksasanewspaperboyandhegetshispayfromhisboss.(month),Homework:,II.Readandreciteparagraphs413.III.Readandrecitethewordsandexpressions.,Electricity,8BChapter4,Adangerousservant,8BChapter3,Publictransport,train,bus,underground,plane,maglevtrain,phrases,热能/电能/声能动能/原子能精力充沛的不同形式的能量一包信件一盒20支香烟终于起先埋电缆在某种程度上谨慎，小心变成欺骗，,heatenergy/lightenergy/soundenergymovementenergy/atomicenergybeenergetic/befullofenergydifferentformsofenergyapacketoflettersapacketof20cigarettesatlast/intheend/finallyatfirst/atthebeginningofburycablesinawaybecarefulwith/ofchangeinto/turnintotricksomebody/playatrick(joke)onsomebody,Fillintheblanks:,foolbatteryhappinessdangerpoliterealproduceThetreescanprotectthemselvesbyachemicalthatmakestheirleavestastenasty.Imsorryaboutmybeinglate,sir.Whatis,waterorfire?Wouldyouliketogetmesome?Dontalwaysdosuchthings.Heansweredthatquestionyesterday.Althoughtheyarepoor,theyare.,jointogetherintheendthatcannotbeseenwordsthatmakesth.clearorsaywhatsth.meansshapesorkindspowerthatmakesthingsworkormakespeopledothingsputsomethingorsomeoneinthegroundaverywidesmilethickropesofwirewhichelectricitypassesthroughpowerthat(comesthroughwiresand)canmakeheat,soundandlight,andmovethingsamachinethattellsyoutheamountused(doneorhappening)everymonththeglasspartofanelectriclampthatgivesoutlight,Writeoutwordsorexpressionsaccordingtotheirmeaning.,connect,atlast,invisible,explanation,forms,energy,bury,grin,cables,electricity,meter,monthly,alightbulb,Choosetherightwordstocompletethesentences:Playingwithfireisvery.(danger,dangerous)Cablesareconnected(with,to)apowerstation.Everyone(can,must)keepquietinthelibrary.Youneed(alotof,many)energytoplaysquash.Wegetelectricityfromthepowerstation(across,through)wiresandcables.Thestarsare(visible,invisible)whenitscloudy.Peopleusuallypaytheirrent(month,monthly).Hewaitedforthebusforanhour.(In,At)theend,itarrived.Ididntremember(what,how)Mr.Leehadaskedmetodo.Noonecanbesure(whatwillmanlooklike,whatmanwilllooklike)inamillionyears.,Fillintheblankswiththeverbsintheirproperforms:Youdbetter(not,take)itaway.Thepenalways(remind)meofmycousin,becauseitwassenttomebyhim.Thepolicemanranuptothethiefand(catch)himbythearm.Ourparentstellus(notlaugh)atothers.Thetwocities(connect)byanewrailway.Didyouhearwhatthechild(explain)toyou?Theenergyoffallingwatercanbeused(produce)electricity.ItisthebestnovelIever(read)before.,Completethesentenceswithproperwordsorphrases:Electricityismuchthanwater.Electricityawire.Youmustelectricitybecauseitisdangerous.Willyouthiswirethe