资料：Thepersonalcomputerwasarevolutionininformationtechnologythatspawneda$50billionhardwarebusiness,withanother$30billioninsoftwareandperipherals(eg.mouse,keyboard,printer,etc.)by1991.Duringitsshort15years,theindustryevolvedthroughthreesuccessiveperiods.Duringitsfirst5to6years,itwascharacterizedbyexplosivegrowthandmultiple,smallcompetitorsvyingforapieceofthemarket.From1981to1985,theindustrybecameabattleforstandardsandretailshelfspace.Thethirderawasoneofincreasingfragmentation.From1986through1991-1992,newmanufacturersfromaroundtheworldgrabbedfromtheindustryleadersasnewchannelsofdistributionemergedandproductinnovationaswellasrevenuegrowthslowed. Duringtheearlyyearsoftheindustry,venturecapitalintheU.S.encouragedtheentryofnewfirmsthatofferedproductsineveryconceivableshapeandsize.By1980,newentrantsfloodedthemarket,promptingdistinctstandardsanduniquetechnicalfeatures.Almosteveryfirmhadadifferentconfigurationofhardwareandsoftware.ThefirstPChadrelativelylittlespeedormemory.However,eventheseearlycomputersallowedmanagerstoperformtasksthatwereverytimeconsuming. Whatwasimpossibleduringtheearlyyearsoftheindustry?
A.Sharing applications between machines. B.Programming on the computer. C.Writing contracts on the computer. D.Buying keyboards and printers.正确答案A
