Unit+4+Natural+Disasters+Video+Time 高中英語人教版（2019）必修第一冊

Unit4NaturalDisasters

VideoTime

Inthisclass,youwillwatchthevideotoknowabouttsunami;discusshowtohelpthepeoplewhohavesufferedfromatsunami;talkaboutthesafetyinstructionsabouttsunami.LearningobjectivesWhatnaturaldisasterisshowninthepicture?TsunamiWhatisatsunami?Whatcausesit?Whatisitsdamage?LookthroughthepictureandintroductionPredictionBeforeYouWatchReadthesentencesabouttheformationandeffectsoftsunamis.Thenmatcheachsentencewiththecorrectpicture.A.Tectonicplates(地殼板塊)pushtogether.B.Aseriesofwavesexpandsinalldirections.C.Wholesectionsofcitiesaredestroyed.CAB

WhileYouWatchTask1:Decidewhetherthestatementsaretrue(T)orfalse(F).1.Therearefewwarningsignsjustbeforeatsunamihits.2.Atsunamibreaksjustlikeanordinarywavebutisbigger.3.ScientistsatthePacificTsunamiWarningCentermonitortheearth’smovements24hoursadayinordertotracktsunami.TFTFTF

WhileYouWatch

Checkyouranswers1.Therearefewwarningsignsjustbeforeatsunamihits.TF

Checkyouranswers2.Atsunamibreaksjustlikeanordinarywavebutisbigger.TFAtsunamiwavedoesn’tbreaklikeanordinarywave.

Checkyouranswers3.ScientistsatthePacificTsunamiWarningCentermonitortheearth’smovements24hoursadayinordertotracktsunami.TF

WhileYouWatchTask2:Circlethecorrectword(s)ineachsentence.1.Anearthquakeoccurswhenplatesbelowtheearth’ssurfacepushtogether/pullapart.2.Tsunamiwavesdeepatseamovefastandriseonlyafew/hundredsoffeet.3.Asthesekillerwavesentershallowwaters,theirspeedisreduced/raised.4.Mosttsunamidamageiscausedwhenthewavescomeinfrom/movebackouttothesea.

Checkyouranswers1.Anearthquakeoccurswhenplatesbelowtheearth’ssurfacepushtogether/pullapart.

Checkyouranswers2.Tsunamiwavesdeepatseamovefastandriseonlyafew/hundredsoffeet.

Checkyouranswers3.Asthesekillerwavesentershallowwaters,theirspeedisreduced/raised.

Checkyouranswers4.Mosttsunamidamageiscausedwhenthewavescomeinfrom/movebackouttothesea.

AfterYouWatchTask3:Workinpairs.Discussthequestions.1.Whathaveyoulearntabouttsunamis?Whatisatsunami?Whatcausesit?Whatisitsdamage?harborwaveanaturaldisastertectonicplatesunderseaearthquakes

AfterYouWatch①③②itsdamage

AfterYouWatch2.Whatkindofhelpdoyouthinkpeoplewhohavesufferedfromatsunamineed?TroubleandproblemWaytohelp1.Peopleareinjured.Medicalteamshouldbesentthere.2.Housesaredamaged.Sheltersshouldbebuiltthere.3.Resoucesarecutoff.Foodandwatershouldbesentthere.4.Peoplelosttheirlovedones.Emotionalhelpshouldbegiven.

AfterYouWatchTask4:Workingroups.Discussandpresentyourideas.Whatshouldwedowhenatsunamihits?Doyouknowsomesafetyinstructions?

Safetyinstructions:Ifyouheartsunamiwarning,evacuateatonce.Goashighandasfarasyoucan.Takeyour

emergencykit.Drop,cover,andholdontoprotectyourselffromthe

possibleearthquake.Avoiddownedpowerlinesandstayawayfrombuildingsandbridges.

AfterYouWatchLivetotell:RaisingAwareness,ReducingMortality.

----UnitedNationsInternationalStrategyforDisasterReduction(2016)

HomeworkOption1:1.Gathermoreknow