thErE hAs BEEn muCh spECulAtion ABout thE origin oF BAsEBAll. in 1907 A spECiAl Commission DECiDED thAt thE moDErn gAmE wAs invEntED ByABnErDouBlEDAy in 1839. onE hunDrED yEArs lAtEr thE nAtionAlBAsEBAll musEum wAs opEnED to honorDouBlEDAy. historiAns, howEvEr, DisAgrEE ABout thE origin oF BAsEBAll. somE sAy thAt BAsEBAll ComEs From BAt-AnD-BAll gAmEs oF AnCiEnt timEs. it is A mAttEr oF rECorD thAt in thE 1700sEnglish Boys plAyED A gAmE thEy CAllED "BAsEBAll".AmEriCAns hAvE plAyED A kinD oF BAsEBAll sinCE ABout 1800.At First thEAmEriCAn gAmE hAD DiFFErEnt rulEs AnD DiFFErEnt nAmEs in vArious pArts oF thE Country — "town BAll", "rounDErs", or "onE olD CAt". youngstErs toDAy still plAy somE oF thEsE simpliFiED Forms oF thE gAmE. BAsEBAll DiD not rECEivE A stAnDArD sEt oF rulEs until 1845, whEnAlExAnDErCArtwright orgAnizED thE kniCkErBoCkErBAsEBAllCluB oF nEw yorkCity. thE rulEsCArtwright sEt up For his ninE-plAyEr tEAm wErE wiDEly ADoptED By othEr CluBs AnD FormED thE BAsis oF moDErn BAsEBAll. thE gAmE wAs plAyED on A "DiAmonD" inFiElD with thE BAsEs 90 FEEt ApArt. thE First tEAm to sCorE 21 runs wAs DEClArED thE winnEr.By 1858 thE nAtionAlAssoCiAtion oFBAsEBAll plAyErs wAs FormED with 25 AmAtEur tEAms. thECinCinnAti rED stoCkings BEgAn to pAy plAyErs in 1869. thE pAssAgE impliEs thAt until 1869, BAsEBAll wAs plAyED For All oF thE Following rEAsonsExCEpt________.
A、ExErCisE
B、lEisurE
C、proFit
D．soCiAlizing