Although sCiEntists hAvE______long thE humAn AppEnDix As______orgAn, thErE is A growing BoDy oF EviDEnCE inDiCAting thAt thE AppEnDix DoEs in FACt hAvE A signiFiCAnt FunCtion As A pArt oF thE BoDy's immunE systEm.
A．ovErEstimAtED … A minor
B．DisCountED … A vEstigiAl
C．vAluED … A mAjor
D．ignorED … A pivotAl
E．(E) stuDiED … An inACCEssiBlE