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1、试题1Passage2P189Areyouplanningavacation?？Ifyoulikehotandextremelydrysummers,gotophoenix,Arizona.Forhottemperaturesbutlotsofrainandthunderstorms,tryMiami,Florida.Ifyouwantaveragetemperaturesandrainfall,St.Louis,Missouri,isthespot.Orifyou’reacoldweatherfan,headtoFairbanks,A
2、laska.Itswintersareverycoldwithlittleprecipitation(冰雹).Eachofthesecitieshasacertaintypeofweather.Theaverageweatherforaplaceovermanyyearsiscalledclimate,andinnotwoplacesintheworldisitexactlythesame.Howcanthisbe?Manythingsinnature,suchassunshine,temperature,andprecipitatio
3、n,affectclimate.Nearnesstomountain,oceans,andlargelakesaffectsittoo.Anotherfactorisaltitude,orheightabovesealevel.Aircoolsasaltitudeincreases.Soacityatahigheraltitudemaybecolderthanoneataloweraltitude.Finally,windsaffectclimate.Theymoveheatandmoisturebetweentheoceansandc
4、ontinents.Windskeepthetropicsfromoverheating.Theykeepthepolarregionsfromgettingoverlycold.Climatechangesoverlongperiodsoftime.Somescientiststhink,forexample,thattheearth’sclimatechangedatthetimeofthedinosaurs(恐龙时代).Theythinkthedinosaursdiedbecauseofthechange.Whatcausesac
5、limatetochange?Onepossiblecausemaybechangesinthesun.Sunspots,forexample,arecool,darkspotsthatformonthesun.Sunspotsmaydecreaseprecipitationontheearthandcauseunusuallydryperiods.Changesintheatmospheremaychangeclimatetoo.Volcaniceruptions(火山的爆发)，forinstance,releasesolidpart
6、iclesintotheair.Theseparticlesmayformacloudthatblocksoutthesun’sheat.Humanactivityisanothercauseofclimatechange.Airpollutionandreductionofforestcovermayhavelong-termeffectsonclimate.6.Thispassageisconcernedwiththingsthataffect______B_______.A.ideaB.climateC.altitudeD.sun
7、spots7.Changeinclimatemayhavecaused_____A_______.A.dinosaurstodieB.darkspotstoformonthesunC.volcaniceruptionD.airpollution8.Theeffectofavolcaniceruptiononclimatemaybetomakeit___D__.A.wetterB.dryerC.warmerD.colder9.Tohelpreadersunderstandhowclimatecanchange,thewriteruses_
8、__A______.A.examplesB.astoryabouttheseashoreC.orderofimportanceD.astrongargument10.Whichofthefollowingi
