人教版高一英语必修1Unit4全套课件

Howmanynaturaldisastersdoyouknow?typhoonLead-inPacifictyphoonreferstotropicalcyclonesforminginthenorthwesternPacificOcean.OthertropicalcyclonesincludehurricanesthatformovertheAtlanticOcean,CaribbeanSea,theGulfofMexico,orthePacificOceannorthoftheequatorandeastoftheDateLine.ThebasinisdemarcatedwithinthePacificOceanfromAsia,northoftheequator,andwestoftheinternationaldateline.StormsfromtheEasternandCentralPacificcrossingthedatelinearere-designatedastyphoons.Typhoonpathsfollowthreegeneraldirections:-Straight:AgeneralwestwardpathaffectsthePhilippines,southernChina,andVietnam.-Recurving:StormsrecurvingaffecteasternChina,Korea,andJapan.-Northward:Frompointoforigin,thestormfollowsanortherlydirection,onlyaffectingsmallislands.IntroductionofTyphoonHowmanynaturaldisastersdoyouknow?thunderstormHowmanynaturaldisastersdoyouknow?floodFloodhappenswhenanareaofland,usuallylow-lying,iscoveredwithwater.Theworstfloodsusuallyoccurwhenariveroverflowsitsbanks.Floodshappenwhensoilandvegetationcannotabsorballthewater;waterthenrunsoffthelandinquantitiesthatcannotbecarriedinstreamchannelsorkeptinnaturalpondsorman-madereservoirs.Periodicfloodsoccurnaturallyonmanyrivers,forminganareaknownasthefloodplain.Theseriverfloodsusuallyresultfromheavyrain,sometimescombinedwithmeltingsnow,whichcausestheriverstooverflowtheirbanks.Coastalareasareoccasionallyfloodedbyhightidescausedbyseverewindsonoceansurfaces,orbytidalwavescausedbyunderseaearthquakes.Thereareoftenmanycausesforaflood.IntroductionofFloodHowmanynaturaldisastersdoyouknow?volcanoHowmanynaturaldisastersdoyouknow?fireHowmanynaturaldisastersdoyouknow?tsunamiAtsunamiisaseriesofwavesgeneratedwhenwaterinalakeortheseaisrapidlydisplacedonamassivescale.Earthquakes,landslides,volcaniceruptionsandlargemeteoriteimpactsallhavethepotentialtogenerateatsunami.Theeffectsofatsunamicanrangefromunnoticeabletodevastating.ThetermtsunamicomesfromtheJapaneselanguagemeaningharborandwave.AlthoughinJapanesetsunamiisusedforboththesingularandplural,inEnglishtsunamisiswell-establishedastheplural.Thetermwascreatedbyfishermenwhoreturnedtoporttofindtheareasurroundingtheharbordevastated,althoughtheyhadnotbeenawareofanywaveintheopenwater.Atsunamiisnotasub-surfaceeventinthedeepocean;itsimplyhasamuchsmalleramplitude(waveheights)offshore,andaverylongwavelength(oftenhundredsofkilometerslong),whichiswhytheygenerallypassunnoticedatsea,formingonlyapassinghumpintheocean.IntroductionofTsunamiHowmanynaturaldisastersdoyouknow?sandstormsBasicknowledgeaboutearthquakeHowtoprotectoneselfandhelpothersindisastersKnowledgeGoalsTopicWordsandExpressionsLearningGoalsimagineshakeriseearthquakewellpipenationcanalstreamdirtruinsufferingextremeinjuredestroybrickdamfrightenfreightingcongratulationjudgeexpresscyclistUselessshockrescueWords:1.havetimetodo有时间做某事2.happentodo碰巧做某事3.shakehandswithsb握手4.burstintotears/laughter突然哭/笑起来5.inruins成为废墟6.cutacross穿过、横穿7.blowaway吹走、刮走8.falldown倒塌9.rescueworkers救援人员10.bepleasedtodo乐意做某事11.judging….from根据……来判断Expressions:TalkingaboutpastexperiencesExpressingthanksFunctionalItemsGrammarLearntouseattributiveclause:(以that,which,who和whose为引导）Enabletowriteasmallarticletodescribeanevent.Developtheabilitytogetthemessagefromdifferentways,justlikethevideo.Thentryyourbesttousethemessageinyourarticle.Haveascientificattitudetowardsdisaster,andgraspmoreknowledgeabouthowtodealwithit.AbilityGoalsEmotionGoals1.Thedisasterandhowtodealwithit.2.Theusageofattributiveclause3.Trytoimprovetheabilityoftalkingaboutpastexperiencesbydescribingthebigeventduringadisaster.ImportantandDifficultPointsImportantPoints1.Trytoknowthewaystorescueinadisaster.2.Trytodeveloptheabilityofspeaking.DifficultPointsComparethetwopictures,thenhaveadiscussionabouttheearthquake'sharmtothepeoplewithyourpartner.Today’sTangShanAftertheearthquakeWarmingUpToday’sTangShanAftertheearthquakeToday’sTangShanAftertheearthquakeToday’sTangShanAftertheearthquakeComparethetwopictures,thenhaveadiscussionabouttheearthquake'sharmtothepeoplewithyourpartner.CaliforniaMajorearthquakeoftheworldEarthquakeshaveoccurredonearth'ssurfacesincetimesimmemorial.Thousandsandthousandsofearthquakeshappeneveryyearhowever,mostofwhichgounnoticedastheyareeithertoweakontheRichterscaleorhappeninremotestoftheareas.Earthquakescausedisastersandcausebothlossoflivesandproperty.May22,1960witnessedtheworld'sstrongestearthquakeinValdicvia,Chile.Theearthquakewithamagnitudeof9.5onRichterscalecaused20,000fatalities.ThesecondstrongestearthquakeoccurredonDecember26,2004withamagnitudeof9.3onRichterscale.OceanfloorofwestSumatraandIndonesiaweretheepicenterofthisearthquakethatcausedover300,000causalities.ThisearthquakecausedthedisastroustsunamiintheIndianOcean.OnMarch27,1964PrinceWilliamSound,Alaskafacedtheworld'sthirdstrongestearthquake.Theearthquakemeasured9.2onRichterscalecausedagreatdealofdamageinAnchorage.Kamchatka,1952having9.0magnitudeandOfftheCoastofEcuador,1906having8.8magnitude,arethefourthandthefifthstrongestearthquakesontheworldtilldate.Talkaboutthelatestearthquakeinlastyear.Asweknow,Wenchuanearthqua