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1、电大《大学英语2》复习资料2:复习资料(1620)III.ReadingComprehensionAreyouplanningavacation?Ifyoulikehotandextremelydrysummers,gotoPhoenix,Arizona・Forhottemperaturesbutlotsofrainandthunderstorms,tryMiami,Florida.Ifyouwantaveragetemperaturesandrainfall,St.Louis,Missouri,isthespot,o
2、rifyou?reacoldweatherfan,headtoFairbanks,Alaska・Itswintersareverycoldwithlittleprecipitation（冰雹）・Eachofthesecitieshasacertaintypeofweather.Theaverageweatherforaplaceovermanyyearsiscalledclimate,andinnotwoplacesintheworldisitexactlythesame・Howcanthisbe?Manythings
3、innature,suchassunshine,temperature,andprecipitation,affectclimate.Nearnesstomountain,oceans,andlargelakesaffectsittoo.Anotherfactorisaltitude,orheightabovesealeve1.Aircoolsasaltitudeincreases・Soacityatahigheraltitudemaybecolderthanoneataloweraltitude・Finallywin
4、dsaffectclimate.Theymoveheatandmoisturebetweentheoceansandcontinents・Windskeepthetropics（热带地区）fromoverheating.Theykeepthepolar（极地的）regionsfromgettingoverlycold.Climatechangesoverlongperiodsoftime・Somescientiststhink,forexample,thattheearthsclimatechangedatthetim
5、eofthedinosaurs・Theythinkthedinosaursdiedbecauseofthechange.Whatcausesaclimatetochange?Onepossiblecausemaybechangesinthesun.Sunspots,forexample,arecool,darkspotsthatformonthesun.Sunspotsmaydecreaseprecipitationontheearthandcauseunusuallydryperiods.Changesintheat
6、mospheremaychangeclimatetoo.Volcaniceruptions（火ill喷发），forinstance,releasesolidparticlesintotheair.Theseparticles（微米立）mayformacloudthatblocksoutthesun'sheat・Humanactivityisanothercauseofclimatechange.Airpollutionandthereductionofforestcovermayhavelong-termeffects
7、onclimate.1.Thispassageisconcernedwiththingsthataffect.A.precipitationB.climateC.altitudeD・sunspots2.Changeinclimatemayhavecaused.A.dinosaurstodieB.darkspotstoformonthesunC・volcaniceruptionD.airpollution3.TheeffectofavolcaniceruptiononclimatemaybetomakeA.wetterB
8、・dryerC.warmerD.colder4.Tohelpreadersunderstandhowclimatecanchange,thewriteruses・A.examplesB・astoryabouttheseashoreC・orderofimportanceD.astrongargument5.Whichofthefol
