ACCorDing to this pAssAgE, thE prACtiCE oF "sEx sElECtion" ________.
A．CAn hElp to prEvEnt All gEnEtiC proBlEms
B．is totAlly unACCEptABlE to EthiCs ExpErts
C．wAs AlrEADy rEAlizED FivE hunDrED yEArs Ago
D．will BEnEFit FAmiliEs with CErtAin inhEritABlE DisEAsEs