ACCorDing to thE Author, whEn young FAmiliEs ArE isolAtED, ______.
A．olD pEoplE CAn EAsily ACCEpt thE ChAngE
B．pEoplE CAn movE From plACE to plACE
C．inDiviDuAls CAn hArDly BEComE innovAtivE
D．EConomy DEvElops At high spEED