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1、Module4SandstormsinAsiaPeriod1IntroductionReadingandVocabularyAsandstorm,alsoknownasaduststorm,isexactlywhatitsoundslike.Averystrongwindstormespeciallyinthedesertcarriescloudsofsandordustthatgreatlyreducesvisibility.Thiswindisusuallycausedbyconvectioncurrents(对流气流),whicha
2、recreatedbyintenseheatingoftheground,andisusuallystrongenoughtomoveentiresanddunes.Airisunstablewhenheated,andthisinstabilityintheairwillcausehigherwindstomixwithwindsintheloweratmosphere,producingstrongsurfacewinds.Sandstormscandisturbpeople’stravel,andcansometimesdestro
3、ywholeroads,anddryflatareas.SimilarduststormscanbefoundontheplanetMars,andarethoughttobeseasonal.Today,thedestructionofforestsandtoomuchfarmingoffarmlandcanleadtosandstorms.Toomuchuseofwaterresourcescanalsocausesandstorms.IntheUnitedStatesofAmerica,sandstormsarerarebecaus
4、eofthelackoflargedesertsandmoreimportantlythedevelopmentofproperagriculturaltechniques.ThelastrecordeddestructivesandstorminAmericanhistorywastheDustBowl,whichoccurredonJuly16,1971andwaswidelyrecordedbymeteorologists(气象学家).Toprotectthemselvesfromsandstorms,somepeoplewearp
5、rotectivesuits.Specialequipmentcanbefixedinsomecarstopreventsandfromgettingintotheengine.Sandstormscancausecoughs,andthesandanddusthasalsobeenknowntocarry“infectiousdiseases”.Sandparticles,unlikedustones,willblockairpassages,andcauseapersonwhobreathesthemintochoke.Dustpar
6、ticlesmaycauseanallergic(过敏的)reaction.Ⅰ.Skimthepassageandfindthemainideaquickly.____________________________________________________________答案：Thepassageaimstotellustheformationanddamageofsandstorms.Ⅱ.Readthepassageagainandchoosethebestanswers.1.Whichofthefollowingplaysth
7、efirstpartinformingsandstorms?A.Theinstabilityofthesand.B.Theinstabilityofthewind.C.Theintenseheatingoftheground.D.Thespeedofthewind.【解析】选C。细节理解题。从第一段的句子“Thiswindisusuallycausedbyconvectioncurrents,whicharecreatedbyintenseheatingoftheground”可知沙尘暴的最初形成是因为地面的热量。2.Fromthesec
8、ondparagraph,wecanlearnthatatpresent .A.sandstormsaremoreoftenseenonMarsthanonEarthB.sandstorm
