Unit4SectionA(3a~3c)课件人教版英语八年级下册

UnitFourTheWondersofNatureSecA3a-3dHowdoweconnectwithnature?Let’straveltoexploretheamazementaboutnature!ReviewWhat’sthehighestmountainintheworld?It’stheMountQomolangma.ReviewWhat’sthebiggestdesert

intheworld?It’stheSaharaDesert.ReviewWhat’sthelowestplaceonearth?It’stheDeadSea.ReviewWhat’sthelongestriver

intheworld?It’stheNile.ReviewWhat’sthedeepestpointintheocean?It’stheMarianaTrench.Whatdoyouknowaboutriversoftheworld?LeadinWatchthevideoandknowmoreabouttherivers.Pre-readingTheYellowRiveristhesecondlongestriverinChinaandthe"motherriver"ofChinesecivilization.Itisfamousforitsyellowsilt(泥沙)fromtheLoessPlateau(黄土高原).Itrunsabout5,464kilometersacrossnorthernChinaandemptiesintotheBohaiSea.Pre-readingTheYangtzeRiveris

thelongestriverinAsiaandthethirdlongestintheworld.Itrunsabout6,300kilometersthroughChina,startingfromtheQinghai-TibetPlateau(青藏高原)andflowingintotheEastChinaSea.ItplaysanimportantroleinChinesehistory,culture,transportation(交通)andagriculture(农业).Pre-readingNileRiveristhelongestriver

intheworld.Itisabout6,650kilometerslongandrunsthrough11countriesinnortheasternAfrica,likeEgyptandSudan.Forthousandsofyears,ithasgivenpeoplewaterandgoodsoilforfarming,soitisveryimportantforlifeinthisarea.Pre-readingWhatcanyouseeinthepicture?

Awaterfall.What’sthenaturalwonder?HukouWaterfall.

Whichriverdoesitfrom?It’sfromtheYellowRiver.While-reading

Listenandchoose.1.WheredidEllagoonhertrip?A.TheYangtzeRiver. B.TheYellowRiver.C.TheNile.2.WhichisthelongestriverinChina?A.TheYangtzeRiver. B.TheYellowRiver.C.TheNile.While-reading

Listenandchoose.3.WhyistheYellowRivercalled“YellowRiver”?A.Becauseitisthemotherriver.B.Becausesomepartoftherivercarriesyellowandbrownearth.C.Becauseitis5,464kilometerslong.4.WhatdotheNileandtheYellowRiverhaveincommon?A.TheybothrunthroughChina.B.Theybothhaveyellowandbrownwater.C.Theybothhelpedancientcivilizationsdevelop.While-readingReadtheconversationandunderlinethethreeriversmentioned.Yaming:Welcomeback,Ella!Howwasyourtrip?Ella:Itwasgreat!WesawtheHukouWaterfallontheYellowRiver.IsthatthelongestriverinChina?Yaming:No,theYangtzeRiveristhelongestriverinChina.Ittravelsthefarthestandisabout6,300kilometreslong.TheYellowRiveris5,464kilometreslongandisthesecondlongest.Bytheway,doyouknowwhyit'scalledtheYellowRiver?Ella:Becauseit'syellow?Yaming:Right.Somepartsoftherivercarrybrownandyellowearth.Ella:That'sinteresting!Ilikelearningaboutrivers.MyfavouriteistheNile.Didyouknowit'sthelongestriverintheworld?Yaming:Yes,it's6,671kilometreslong.It'sveryimportantinEgypt'shistory.Ella:That'sright.BoththeNileandtheYellowRiverhelpedancientcivilizationstodevelop.Andthey'restillveryimportanttoday.Yaming:Yes.InChina,weevencalltheYellowRiverour"motherriver"!Ella:Weshouldprotectthematallcosts.While-readingWhatdoYamingandEllaknowabouttheserivers?Readtheconversationagainandcompletethetable.3bRiverCountryLengthImportanceYellowRiver________________________kmhelpedinthedevelopmentof

ancient_________________NileRiver________________________kmChina5,464Egypt6,671civilization文明/ˌsɪvəlaɪˈzeɪʃn/While-readingReadtheconversationandunderlinethethreeriversmentioned.Yaming:Welcomeback,Ella!Howwasyourtrip?Ella:Itwasgreat!WesawtheHukouWaterfallontheYellowRiver.IsthatthelongestriverinChina?Yaming:No,theYangtzeRiveristhelongestriverinChina.Ittravelsthefarthestandisabout6,300kilometreslong.TheYellowRiveris5,464kilometreslongandisthesecondlongest.Bytheway,doyouknowwhyit'scalledtheYellowRiver?Ella:Becauseit'syellow?Yaming:Right.Somepartsoftherivercarrybrownandyellowearth.Ella:That'sinteresting!Ilikelearningaboutrivers.MyfavouriteistheNile.Didyouknowit'sthelongestriverintheworld?Yaming:Yes,it's6,671kilometreslong.It'sveryimportantinEgypt'shistory.Ella:That'sright.BoththeNileandtheYellowRiverhelpedancientcivilizationstodevelop.Andthey'restillveryimportanttoday.Yaming:Yes.InChina,weevencalltheYellowRiverour"motherriver"!Ella:Weshouldprotectthematallcosts.Howamazingandimportanttheriversare!Let’ssummarizethefeaturesofthethreerivers!While-readingONETheYellowRiverAbout5,464kilometerslong.ThesecondlongestriverinChina.Carriesbrownandyellowearth.“Motherriver”HelpedancientcivilizationstodevelopTWOPARTTWO冰山雪地环境生态保护ICEBERGANDSNOWENVIRONMENTECOLOGICALPROTECTIONTWOTheYangtzeRiverAbout6,300kilometerslong.ThelongestriverinChina.Ittravelsthefarthest.ONEPARTONE草原建设环境生态保护GRASSLANDCONSTRUCTIONENVIRONMENTECOLOGICALPROTECTIONTHREEPARTTHREE城市风光环境生态保护URBANRIVERSENVIRONMENTECOLOGICALPROTECTIONTHREETheNile6,771kilometerslong.ThelongestriverinAfrica.importantinEgypthistory.HelpedancientcivilizationstodevelopTWOPARTTWO冰山雪地环境生态保护ICEBERGANDSNOWENVIRONMENTECOLOGICALPROTECTIONFOURPARTFOUR森林植被环境生态保护FORESTVEGETATIONENVIRONMENTECOLOGICALPROTECTIONPost-readingPost-readingLet’sreadthenumbers!6,3006,6715,464sixthousandthreehundred7,259,613sevenmilliontwohundred(and)fifty-ninethousandsixhundred(and)thirteen

59,613.78fifty-ninethousandsixhundred(and)thirteenpointseveneightthousandthousandthousandthousandmillionmillionpointsixthousandsixhundredandseventy-one

fivethousandfourhundred(and)sixty-fourPost-readingWhydowecalltheYellowRiverour“motherriver”?BecausetheYellowRiveristhecradle(摇篮)ofancientChinesecivilization.Itprovidedwaterforfarming,supportedthegrowthofearlysettlements(聚居地),andhelpedshapeChinesecultureandhistory.Ithasnurtured(培育)generationsofChinesepeople,sowecallitour"motherriver".Post-readingHowdoriversstillhelpustoday?Rivershelpusinmanywaystoday.First,theyprovidewaterforfarmingtogrowcrops.Second,theyareusedfortransporttocarrygoodsandpeople.Third,theymakecleanenergythroughhydroelectricpower.Also,forecosystem,theysupportwildlifeandgiveusniceplacestorelax.FarmingTransportEnergyEcosystemSpeaking3cListentotheconversationandrole-playit.Yaming:Welcomeback,Ella!Howwasyourtrip?Ella:Itwasgreat!WesawtheHukouWaterfallontheYellowRiver.IsthatthelongestriverinChina?Yaming:No,theYangtzeRiveristhelongestriverinChina.Ittravelsthefarthestandisabout6,300kilometreslong.TheYellowRiveris5,464kilometreslongandisthesecondlongest.Bytheway,doyouknowwhyit'scalledtheYellowRiver?Ella:Becauseit'syellow?Yaming:Right.Somepartsoftherivercarrybrownandyellowearth.Ella:That'sinteresting!Ilikelearningaboutrivers.MyfavouriteistheNile.Didyouknowit'sthelongestriverintheworld?Yaming:Yes,it's6,671kilometreslong.It'sveryimportantinEgypt'shistory.Ella:That'sright.BoththeNileandtheYellowRiverhelpedancientcivilizationstodevelop.Andthey'restillveryimportanttoday.Yaming:Yes.InChina,weevencalltheYellowRiverour"motherriver"!Ella:Weshouldprotectthematallcosts.Speaking3cWatchthevideo.ShowTimePost-listening3dImaginethatyouareYamingorElla.ContinuetheconversationwithapartneraboutothergeographicalfeaturesinChina.Ella:CouldyoutellmemoreaboutChina,Yaming?Yaming:Sure!Whatwouldyouliketoknow?Ella:What’sthebiggestdesertinChina?Yaming:It’stheTaklimakanDesert(塔克拉玛干沙漠).Ella:Doyouknow...?CouldyoutellmemoreaboutChina,Yaming?Sure!Whatwouldyouliketoknow?What’sthebiggestdesertinChina?It’stheTaklimakanDesert.DoyouknowhowbigtheTaklimakanDesertis?It’sabout337,600squarekilometers.

Arethereanyplantsoranimalsthere?Yes!Therearesomespecialplantsandcamelsthatcanliveinthedryenvironment.Isitdangeroustotravelthere?Sometimes.Thesandstormsarestrong,butit’salsoabeautifulplace.CouldyoutellmemoreaboutChina,Yaming?Sure!Whatwouldyouliketoknow?What’sthelargestlakeinChina?It’sQinghaiLake.It’sabeautifulsaltwaterlakeinQinghaiProvince.DoyouknowhowlargetheQinghaiLakeis?It’sabout4,625squarekilometers.Isitagoodplacetovisit?Yes!Manypeoplegotheretoseetheclearbluewaterandlovelybirds.

Cool!Iwanttovisititoneday.

Riversareourheritage，protectthem!Languagepoints

结构公式：

基数词+单位词+形容词（long/wide/high/deep）

当基数词>1时，单位词用复数（kilometres,metres）

同义替换：20metreswide=20metresinwidth100metreshigh=100metresinheight长宽高深的表达Languagepoints

词性：n.方式；途径（单复数同形）

搭配：meansof(doing)sth.

（做）……的方式/途径

byallmeans

尽一切办法

bynomeans

绝不eg：Carisamainmeansoftransport.

汽车是主要的交通工具。means相关用法Languagepoints

词性：n.发展；壮大（不可数名词）

构词法：develop(v.发展)+-ment(名词后缀)

搭配：

withthedevelopmentof...

（随着）……的发展

动词

develop发展；壮大

形容词developing

发展中的

形容词

developed发达的

Withthedevelopmentofscience,ourlifeischanging.

随着科学的发展，我们的生活正在改变。development相关用法Languagepoints

发音1：/ˈdezət/（名词）→

沙漠；荒原eg：TheTaklimakanisthebiggestdesertinChina.发音2：/dɪˈzɜːt/（动词）→抛弃；遗弃eg：Hedesertedhisfamilyandlefthome.

易混词提示：

dessert

/dɪˈzɜːt/（名词）→

（饭后的）甜点，甜食（注意拼写：双s）

desert

相关用法Mikelives________fromschoolofallthestudents,andhealwaystakesthesubwaytoschool.A．far B．farther C．thefarther D．thefarthest1SutongBridgeovertheYa