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1、2019高考英语二轮强化训练—阅读理解48AWithouttheatmospheretherewouldbenoweather,nowind,rain,snow,orclouds.Airisallaroundus;weliveatthebottomofagreatoceanofair.Itisinvisible,butwecanfeelitwhenitmoves.Therearemilesofairaboveus,pressingdownwithgreatweightontheearthandeverythingonit.Becauseairp
2、ressesdownonusfromalldirectionsatthesametime,andbecauseweareabletobear（忍受）thisweight,wedonotseemtofeelit.Butscientistshaveprovedthatairhasthisweight,andthatanythingthathasweightcreates（产生）aforcecalledpressure.Aschangesinairpressuretakeplace,theymakeairmove.Airisagasthatexpan
3、ds（膨胀）whenheated,getslighter,andmovesupward.Whenairiscooled,itgetsheavier,sinksclosetotheearth’ssurface,andflowslikewaterinagreatriver.Aswarmairrises,coldairrushesintotakeitsplace.Thuswindsoriginate（起源）.Thewindsthatblowhighaboveusarecausedbythewarmerairrunningawayfromcoldera
4、ir.Thewindwefeelneartheearth’ssurfaceistheheavycolderairtryinghardtocatchthewarmerair.Changesintemperaturecausetheairtomove.Andofcoursetherearemanychanges,soairmovementsaretakingplacepracticallyallthetime.56．Thefirstparagraphmainlytellsusthecausesof.A．whywedon’tfeelairB．whey
5、atmosphereisimportanttousC．whythereisairsurroundingusD．whythereisairpressure57．Airmovesundersuchconditionsthat.A．thereisairpressureB．theairisheavyC．airpressuredoesn’tremainthesameallthetimeD．aircomesupanddown58．Whichofthefollowingpicturesbesttellsthemovementsofwarmairandcold
6、air?59．Accordingtothepassage,insomeareasiffarmerswhogrowgrapes（葡萄）lightfiresintheearlymorning,thatisbecausethefarmerswantto.A．driveawaywarmairB．preventcoldairfromcomingtoharmtheirplantsC．causemorewindD．stopwarmairrunningawayBAlzheimer’sdiseaseisamajornationalhealthproblem.Ne
7、arly2millionAmericansovertheageof65haveAlzheimer’sdisease.Itisaleadingcauseofdeathamongtheelderly.ButAlzheimer’sdiseaseisnotconfined（限于）totheaged.Theremaybeamillionormorepeopleundertheageof65sufferingfromthedisease.Atonetime,peoplesufferingfromthediseaseweresaidtobe“gettingo
8、ld”.Thediseasewasthoughttobeanaturalpartofgrowingold,butitisnowknownthatAlz
