jACkmAn BEliEvEs thAt Both BusinEss pEoplE AnD DoCtors ______.
A．hAvE to BE gooD At mAnAgEmEnt.
B．shoulD kEEp up to DAtE with thEir FiElD.
C．nEED to sElECt rEADing mAtEriAl CArEFully.