ForalongtimeChesterCarlsoncarriedaroundhislittleblackbox----theinventionoverwhichhehadworkedandstruggledforyears.Heshowedittothedirectorsoftwenty-onelargeAmericancorporations,suchas“GeneralElectric,InternationalBu

　　ForalongtimeChesterCarlsoncarriedaroundhislittleblackbox----theinventionoverwhichhehadworkedandstruggledforyears.Heshowedittothedirectorsoftwenty-onelargeAmericancorporations,suchas“GeneralElectric,InternationalBusinessMachines(IBM),Lockheed,andRCA.”

　　Nobodywantedit.

　　Nobodywantedtoinvestapennyinit.

　　ItmustbepainfulforthosedirectorstothinkofChesterCarlsonnow.Forthelittleblackboxistheheartofthemulti-billion-dollarXeroxCorporation.Carlsonistheinventorof“xerography”(fromtwoGreekwordsmeaning“drywriting”),thedry-printingprocessusedinthousandsandthousandsofoffices,businesses,industries,universities,shops,andgovernmentagenciesaroundtheworld.

　　ThankstoCarlson,itnowtakesminutestocopyadocumentwhich,twentyyearsago,wouldhavekeptasecretarybusyforawholeday.AndforafewpenniesanyonecanhaveacopyofanythingfromcookingrecipestoGreekpoetry.Morethanthirtybillionsuchcopiesaremadeeachyear.

　　WhenChesterCarlsonwenttoworkinapatentofficein1930,thecopyingmethodswereslow,dirty,andexpensive.Inhisjob,Carlsonhadtomakemanycopiesofpatentsforinventions.Onenight,afterworkinglateandpainfully,hedecidedthatsomebodyhadbetterfindaneasierwaytodoit.Hewenttoworkinthekitchenofhisapartmentwithmeasuringcupsandcookingpots.By1937,havingdevelopedasimpleformofxerography,heappliedforhisfirstpatentontheprocess.

　　1）Chestercarlsonwas_

　　A)adirectorofanAmericancorporation

　　B)aninventorofacopyingmaching

　　C)acompanysalesman

　　D)anofficeclerkinacompany

　　2)atfirstnobodywantedthislittleblackboxbecause_

　　a)itwasconsideredtobeofnovalue

　　b)verylittlewasknownaboutit

　　c)peoplethoughtitwasnotaworth-whileinvestment

　　d)alloftheabove

　　3)howlongdidittakeCarlsontocompletehisresearchintothisdry-printingprocess?

　　a)alifetime

　　b)sevenyears

　　c)twentyyears

　　d)notmentionedinthepassage