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1、阅读理解训练题（五十四）AX-rayswerefirstdiscoveredbyaGermanscientist,WilhelmKonradRontgen,in1895,almostbyaccident.Heandseveralotherscientistswereexperimentingwithpassingelectriccurrentsthroughcertaingasesinaspecialglasstubefromwhichtheairhadbeenmoved.OnedayRontgennoticedthat,
2、evenwhenthetubewascoveredwithblackpaper,somestrangekindofradiationwascomingthroughandmakingascreennearbyglow.Rontgencouldnotseeanythingcomingoutofthetube,butthenhediscoveredthatifheputthescreeninthenextroomontheothersideofacloseddoor,therayscouldpassnotonlythrough
3、blackpaperbutalsothroughwood.Thenextthinghefoundoutwasthatifheputhishandbetweentheraysandaphotographicplate,therayswouldprintashadowofthebonyframeworkofhishandontheplate.Infact,therayscouldpassaseasilythroughthefleshypartofhishandasthroughtheblackpaper,buthardlyat
4、allthroughthebone.SoRontgenmadethefirstX-raypictureofahand,showingjusthowthebonesinthehandfittogether.56．WhatpuzzledRontgenonedayduringhisexperimentwas.A．somepassingelectriccurrentB．someradiationcomingthroughthecoveredtubeC．theblack-paper-coveredtubeD．thescreennea
5、rby57．Thescreendidn’tstopglowingevenwhen.A．itwasmovedtothenextroomB．itwasmovedtotheothersideoftheroomC．thedoorwasclosedD．theblackpaperwasmovedfromthetube58．Rontgenputhishandbetweentheraysandaphotographicplateinorderto.A．stoptheradiationB．makeanX-rayphotoofitC．find
6、outmoreabouttheraysD．seethroughthebonesofhishand59．Theraysprovedtobeincapable(不能的)ofpassingthrough.A．woodB．fleshC．boneD．blackpaper60．Fromthepassage,weknowX-raysare.A．invisibleB．changeableC．whiteD．brightBAshoppingcenterisaplacewheremanydifferentshopsandstoresarecol
7、lectedunderoneroof.Youcanbuyeverythingthere,andtherearealsobanksrestaurantsand,sometimes,apostoffice.ThereareotherplacesintheUnitedStateswhicharecalledfive-and–ten-centstoresbecausetheyusedtosellthingsfor5to10cents.Todaytheysellalmostanythingandsomeofthethingscost
8、severaldollars.Supermarketsarefoundinallthecities.Theysellfoodandmanyothergoods.Youwalkaroundthesupermarket,choosethethingsyouwant,putthemintoaspecialba
