《英语课文总结》PPT课件

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1、Unit3TextOceansofSandTalkaboutthedesertheatstrokesweatingHuntingincolddesertShelterfromsnowstormStoringfoodBrainstormingworkingroupsoffour,discussandwritedownthewordsorexpressionsthatoccurtoyouwhenyoureadtheword“desert’.Usethesketchbelowasaguideinyour

2、discussion.sanddry/droughtsunhotcoldnorainclearskyplantsoasis（绿洲）pastureanimalbarren1.Whyaredesertwindsdry?2.Desertareveryhotduringtheday,whyaredesertnightsoftencold?3.Howplantssurviveindeserts?4.Wheredosmallanimalsliveindeserts?Whydotheylivethere?5.W

3、heredopeopleliveinsomedesert?6.Howtopreventdesertification?1.Whyaredesertwindsdry?Somedesertsarein“rainshadow”areawherethewindshavelostwhatmoisturetheyhadcrossinghighground.2.Desertareveryhotduringtheday,whyaredesertnightsoftencold?Becauseclearskiesal

4、lowheattoescapeintotheatmosphere.蒲公英dandelion3.Howplantssurviveindeserts?saguaromesquit(e)墨西哥合欢树属植物；牧豆树Someseedsofplantslieinthegroundforyearswaitingfortherain.Otherplantsstorewaterintheirleaves,stemsorroots.Manyclosetheirporesduringthedaysotheydonotl

5、osemoisture.4.Wheredosmallanimalsliveindeserts?Whydotheylivethere?Theyliveinholesorburrows.Holesorburrowstrapmoistureandstaycoolerthanthegroundabove.5.Wheredopeopleliveinsomedesert?aroundoases(fertileareas)formaroundwellsorsprings6.Howtopreventdeserti

6、fication1.Toplanttreesandhedges(树篱：由一排密种的灌木或长得低的树形成的一道栅栏或分界线)2.Toreducetheamountofanimalstoprotectcropsfromgrazing.3.Tobuildlinesofstonesacrossslopestopreventrainwaterrunningawayandallowittosoakintothesoil.LearningnewwordsLookatthepicturesandguesstheE

7、nglishnames.trytomemorizethemasmanyasyoucan蒲公英dandeliondandelion树形仙人掌saguarosaguaro仙人掌cacti(复数)cactusCactushasspines墨西哥合欢树属植物；牧豆树mesquit(e)mesquit(e)洞穴burrowburrowburrow（冷血的卵生）爬行动物reptilereptilereptilereptile浦乳动物mammalmammalmammalsidewindersidewinders

8、idewinder（美国西南部产的一种）响尾蛇沙漠中的绿洲oasis(pl.oases)oasis[əʊ’eɪsɪs][əʊ’eɪsɪ：z]lizardlizardlizard蜥蜴骆驼camelcamel牧场，草原pasturepasture鹅卵石pebblepebble沙砾gravelgravelgravelWritedownthewordsinblanksaccordingtothemeaning1.Notgoodenoughtoproducecrops.___________