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1、12安顺市第一高级中学高一英语导学案必修三【背景阅读材料】AASANDSTORMstruckBeijingyesterday,coveringhomes,streetsandcarsinbrowndustandleavingtheskiesamurkyyellowasthecitysuffereditsworstpollutioninyearsaheadofthe2008SummerOlympics.Thesandstormoriginated(起源)ontheborderofChinaandMongoliaandstartedaffectingBeijingonSundayn
2、ight.“Unliketheparticulate(微粒的)matterthatoftenexistsinBeijing’sair,thesuspendinggranuleshittingthecitytodayarebigger,thoughstilllessthan100micronsindiameter,”saidWangXiaoming,anofficialwiththemunicipalenvironmentalprotectionbureau(局).“That’swhywefeelsandisrainingdown.”Theparticulatemattertha
3、toftenhoversoverBeijingismostlylessthan10micronsindiameter,headded.TheBeijingEnvironmentalProtectionBureauwarnedthesandstormcouldbeharmful.“Sandstormscanaffectthehumanbody,especiallytherespiratory(呼吸的)system,”anofficialwiththebureausaid.Hospitalshavedealtwithasharpincreaseinpatientswithrespi
4、ratorydiseases,andnews-paperswarnedpeopletowearmasksoutdoors.Sandstormscouldeasilyoccuratplaceswithlittlerainfall,scarcevegetationandfrequentgales,saidQiaoLin,anexpertwiththeChinaMeteorologicalAdministration.NorthernChinaexperiencessandstormsalmosteveryspring.Thesituationisworsenedbyhigherte
5、mperaturesthisspringandtheprolongeddroughtinnorthernChina,Qiaosaid.Chinalaunchedanafforestation（造林）projectin2000intheInnerMongoliaAutonomousRegion,whichisregardedasthesourceofsandstorm.Theproject,however,hasnotbeenabletocontrolthedesertification.BNWChinasandstormshutsairports,schoolsBEIJING-
6、-AsandstormhitregionsofnorthwestChinaThursday,delayingflights,strandingthousandsofpassengersandforcingschoolstosuspend(暂停)classes.Partsoffiveprovincialregionswereaffected,includingXinjiangUygurAutonomousRegion,NingxiaHuiAutonomousRegion,InnerMongoliaAutonomousRegion,andtheprovincesofGansuand
7、Shaanxi,theNationalMeteorologicalCentersaid.ThesandstormhittheGansuprovincialcapitalofLanzhouinthemorningandreducedvisibility(能见度)ytolessthan500meters,saidXuDongbei,chiefforecasterofthecity'sobservatory.FurtherwestinDunhuang,atouristdestinationfamo
