外研社必修三Module4_Sandstorms_in_Asia课件.ppt

Module4SandstomsinAsia,普安一中杨丹丹,Topic:SandstormsinAsiaReadingandVocabulary,Contents:1.Informationaboutsandstorms.2.Environmentalprotection.Teachingaims:1.Tohelpstudentstoknowthecausesandeffectsofasandstormandsolutions;2.Toenablestudentstofindtheanswersinthetextquicklyandcorrectly;3.ToimprovestudentsOralEnglishbyretellingthetext;4.Toencouragestudentstotalkaboutwaystoprotecttheenvironment;5.Toincreasestudentssenseofdutytoprotecttheenvironment.Teachingdifficulties:Howtohelpstudentstolearnaboutsandstormsandtheenvironment.Teachingimportances:Helpstudentstounderstandthepassagebetter.Teachingaids:PicturesPPT,tornado,hurricane,NaturalDisasters,earthquake,sandstorm,lightning,volcaniceruption,NorthAmerica,CentralAfrica,Australia,CentralAsia,B,C,A,InnerMongolia,Gansu,Xinjiang,Reading活跃起来;引起注意;（使）认识到。,OnemorningyouwillwakeupandbedoneKeeptheroomdarkwhenyouwakeup.Wakeupthedaughters,TheChineseCentralWeatherStationcanforecastasandstormsomeweeksbeforeitarrivesinBeijing,butthestrengthofthestormsometimessurprisespeople.Whenasandstormarrivesinthecity,weatherexpertsadvisepeoplenottogoout.HuangXiaomei,wholivesinBeijingsays,Tobecyclinginasandstormisfrightening.Thewindsareverystrong.Itsdifficulttobreatheandthedustmakesmeill.Soifyouwanttogoout,youdbetterwearamask.,arriveat到达arrivein到达arriveat+较小的地点名词,如school,park,zoohearrivedattheschool.arrivein+较大的地点名词,Beijing,ShangHaihehasarrivedinBeijing.,5strengthnU力量；力气；体力；实力,Hehasbeendoingweighttrainingtobuilduphisstrength.他一直进行举重训练以增强体力。Muchofthecountrysmilitarystrengthliesinitsmissileforce.这个国家的军事实力主要体现在导弹部队上。Theboyliftedthestonewithallhisstrength.男孩用尽全力举起了石头。withallonesstrength尽力onthestrengthofsth.凭借(或根据)某事物strengthenv加强,【轻巧辨析】force/strength/energy/power(1)force主要指自然界的力量、暴力、势力以及法律、道德或感情的力量、效力、强制力、军事力量、武力等。(2)strength说人时，指“力气”；说物时，指“强度”。(3)energy主要指人生理上的精力或自然界中的能量、能源。(4)power主要指做一件事所依靠的能力、功能；也可指人或机器等事物潜在或所能发挥出来的力量，还可指职权、权力、政权，也可指电力、动力、功率。,Itsdifficulttobreatheandthedustmakesmeillitis+adj+to.真正的主语是不定式to引导的1.Itsimportanttostudyhard.2.ItsgoodtolearnEnglishwell.3.Itshealthytoeatmorevegetables.4.Itsbadtoreadinthesun.5.Itsharmfultogetuplate.,youdbetterwearamask.,hadbetterdosth最好做某事hadbetternotdosth最好不做某事youhadbetterstudynow.Youdbettergotohospitalatonce.Tom,youdbettergotheretoday.思考：上面的三个例句的否定句怎么变？,Thedesertisonly250kilometresawaytothewestofBeijing.Topreventitcomingnearer,thegovernmentisplantingtrees.Alreadythegovernmenthasplantedmorethan30billiontreesandplanstocontinueplantingforthenextfiveyears,6prevent.(from)阻止；制止stopsb.(from)doingsth.阻止某人做某事keepsb.fromdoingsth.阻止某人做某事protectsb.from.保护某人不受侵袭，挡住，防御keepsb.doingsth.让某人一直做某事提示：(1)在被动句中from均不能省略。如：Wewerestopped/prevented/keptfromgoingoutbytheheavyrain.大雨使我们无法外出。(2)protect.from.中from后接能带来伤害或损害之物。如：T