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1、阅读理解训练题（五十五）AWithouttheatmospheretherewouldbenoweather,nowind,rain,snow,orclouds.Airisallaroundus;weliveatthebottomofagreatoceanofair.Itisinvisible,butwecanfeelitwhenitmoves.Therearemilesofairaboveus,pressingdownwithgreatweightontheearthandeverythingonit.Becauseairpressesdownonusfromalldirect
2、ionsatthesametime,andbecauseweareabletobear（忍受）thisweight,wedonotseemtofeelit.Butscientistshaveprovedthatairhasthisweight,andthatanythingthathasweightcreates（产生）aforcecalledpressure.Aschangesinairpressuretakeplace,theymakeairmove.Airisagasthatexpands（膨胀）whenheated,getslighter,andmovesupward.W
3、henairiscooled,itgetsheavier,sinksclosetotheearth’ssurface,andflowslikewaterinagreatriver.Aswarmairrises,coldairrushesintotakeitsplace.Thuswindsoriginate（起源）.Thewindsthatblowhighaboveusarecausedbythewarmerairrunningawayfromcolderair.Thewindwefeelneartheearth’ssurfaceistheheavycolderairtryingh
4、ardtocatchthewarmerair.Changesintemperaturecausetheairtomove.Andofcoursetherearemanychanges,soairmovementsaretakingplacepracticallyallthetime.56．Thefirstparagraphmainlytellsusthecausesof.A．whywedon’tfeelairB．wheyatmosphereisimportanttousC．whythereisairsurroundingusD．whythereisairpressure57．Ai
5、rmovesundersuchconditionsthat.A．thereisairpressureB．theairisheavyC．airpressuredoesn’tremainthesameallthetimeD．aircomesupanddown58．Whichofthefollowingpicturesbesttellsthemovementsofwarmairandcoldair?59．Accordingtothepassage,insomeareasiffarmerswhogrowgrapes（葡萄）lightfiresintheearlymorning,thati
6、sbecausethefarmerswantto.A．driveawaywarmairB．preventcoldairfromcomingtoharmtheirplantsC．causemorewindD．stopwarmairrunningawayBAlzheimer’sdiseaseisamajornationalhealthproblem.Nearly2millionAmericansovertheageof65haveAlzheimer’sdisease.Itisaleadingcauseofdeathamongtheelderly.ButAlzheimer’sdisea
7、seisnotconfined（限于）totheaged.Theremaybeamillionormorepeopleundertheageof65suffering-5-fromthedisease.Atonetime,peoplesufferingfromthediseaseweresaidtobe“gettingold”.Thediseasewasthoughttobeanaturalpartofgrowingold,butitisnowknownthatAlzheimer
