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简介：一、教学理念1.英语教学是语言实践,要以活动为主要教学方式,强调在活动中培养学生的综合语言运用能力,为学生的继续学习和未来发展创造有利条件。2.活动的设计要建立在学生的已有水平上,课堂上每一个活动都要有清晰的目标,为了达到这个目标,活动设计要以学生为本。3.活动设计的目标是多维的,活动中不仅要训练学生的语言交际能力,还要培养学生良好的心理素质和学习习惯。

简介：AcomparativestudyontheverticaldistributionsofaerosolopticalpropertiesduringhazeandfloatingdustweatherinShanghaiwasconductedbasedonthedataobtainedfromamicropulselidar.Therewasadistinctdifferenceinlayerthicknessandextinctioncoefficientunderthetwotypesofweatherconditions.Aerosolswereconcentratedbelow1kmandtheaerosolextinctioncoefficientsrangedfrom0.25to1.50km-1onhazedays.Incontrast,aerosolswithsmallerextinctioncoefficients(0.200.35km-1)accumulatedmainlyfromthesurfaceto2kmonfloatingdustdays.Theseasonalvariationsofextinctionandaerosolopticaldepth（AOD）forbothhazeandfloatingdustcasesweresimilargreatestinwinter,smallerinspring,andsmallestinautumn.Morethan85%oftheaerosolsappearedintheatmospherebelow1kmduringseverehazeandfloatingdustweather.Thediurnalvariationoftheextinctioncoefficientofhazeexhibitedabimodalshapewithtwopeaksinthemorningoratnoon,andatnightfall,respectively.Theaerosolextinctioncoefficientgraduallyincreasedthroughoutthedayduringfloatingdustweather.Casestudiesshowedthathazeaerosolsweregeneratedfromthesurfaceandthenliftedup,butfloatingdustaerosolsweretransportedverticallyfromhigheraltitudetothesurface.TheAODduringfloatingdustweatherwashigherthanthatduringhaze.Theboundarylayerwasmorestableduringhazethanduringfloatingdustweather.