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1、随堂练习3I.阅读理解：AConsideredasacontinuousbodyoffluid（流体）,theatmosphere（大气）isanotherkindofocean.Yet,inviewofthetotalamountofrainandsnowonlandareasinthecourseofayear,oneofthemostamazingwaterfactsistheverysmallamountofwaterintheatmosphereatanygiventime.Thevolume（体积）ofth
2、elowersevenmilesoftheatmosphere,whereweathereventstakeplace,isroughlyfourtimesthevolumeoftheworld’soceans.Buttheatmospherecontainsverylittlewater.Itischieflyintheformofvapor（蒸气）,someofwhichiscarriedoverlandbyaircurrents.Ifallvaporsuddenlyfellfromtheairontotheear
3、th’ssurface,itwouldformalayeronlyaboutoneinchthick.Aheavyrainstormonagivenareamayuseuponlyasmallpercentageofthewaterfromtheairmassthatpassesover.How,then,cansomelandareasreceivemorethan400inchesofrainperyear?Howcanseveralinchesofrainfallduringasinglestorminafewm
4、inutesorhours?Theansweristhatrain—producingairmassesarealwaysmoving,andasthedrivingairmassmoveson,newdampairtakesitsplace.Thebasicsourceofmostwatervaporistheocean.Evaporation（蒸发）,vaportransport,andrainfallmakeupthecontinuousmovementofwaterfromoceantoatmosphereto
5、landandbacktothesea.Riversreturnwatertothesea.Intheunderground,flowingbodiesofwatersendoutsomewaterdirectlyintoriversandsomedirectlytothesea.1．Whatmighthavebeendiscussedinthepreceding（在前的）paragraphs？A．Theocean.B．Theearth.C．Therainfall.D．Theatmosphere.2．Itcanbein
6、ferredfromthepassagethat.A．theatmospherehasalotofwaterinitwhenitgoesaroundB．thewaterintheatmosphereispurerthanthatintheworld’soceansC．theamountofwaterintheatmosphereisgreaterthanthatintheoceansintheworldD．thesmallamountofwaterintheatmosphereplaysanimportantparti
7、ntherainfallontheearth3．Whichfactdoesthispassageleadustobelieve？A．Thevolumeoftheatmosphereisfourtimesthatoftheworld’soceansB．ThewaterintheoceansinthemainsourceofrainandsnowonlandareasC．TheatmosphereismainlymadeupofthevaporcarriedoverlandbyaircurrentsD．Theearthca
8、nnotsupportthewaterintheatmosphereifitfallsdownontotheearthsuddenlyBTheAtlanticOcean,namedforthelostislandofAtlantisinveryoldstories,hasmadeupfortheromanticbeginningo
