从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。

pAssAgE onE quEstions 21 to 25 ArE BAsED on thE Following pAssAgE. thE sEA is thE Common propErty oF All nAtions. it BElongs EquAlly to All. nonE CAn AppropriAtE it ExClusivEly to thEmsElvEs；nor is it“ForEign”to Any. this wAs thE DECision oF john mArshAll, ChiEF justiCE oF thE unitED stAtEs From 1801 to 1835. it wAs stAtED As A FunDAmEntAl rulE thE sEA thAt no onE, AnD thErEForE EvEryonE, owns thE oCEAn. this mEAns thAt outsiDE tErritoriAl wAtErs(thE wAtErs within thrEE milEs oF A Country’s CoAst), thE lAw is whAtEvEr nAtions AgrEE on in pEACEtimE AnD whAtEvEr thE strongEst nAvAl powErs CAn EnForCE in wArtimE.AFtEr thE unitED stAtEs purChAsEDAlAskA,AmEriCAns BEgAn to sEizECAnADiAns who wErE hunting sEAls outsiDEAlAskAn tErritoriAl wAtErs. thEAmEriCAns ClAimED thAt thE sEAls wErEAmEriCAn propErty BECAusE thEy oFtEn CAmE in to thEAlAskAn shorEs ownED By thE unitED stAtEs. intErnAtionAl ArBitrAtors DisAgrEED with this rEAsoning. in somE CAsEs, howEvEr, thE spECiAl rights oF A nAtion thAt mAkEs usE oF An opEn-sEA ArEA ArE rECognizED、 All oF thE sEA’s rulEs oF thE roAD ArE EstABlishED By intErnAtionAl ConFErEnCEs AnD trEAtiEs.

thE mAin iDEA oF this pAssAgE is thAt______.A．thE lAw oF thE sEA wAs stAtED By john mArshAll
B．somE nAtions ArE ABlE to ACquirE spECiAl opEn-sEA rights
C．EvEry nAtion owns its tErritoriAl wAtErs
D．thE lAws oF thE sEA ArE EstABlishED By intErnAtionAl AgrEEmEnt