thE pAssAgE impliEs thAt our prEsEnt tEChnologiCAl AChiEvEmEnts ______.
A．ArE suCCEssFul But not hArmFul
B．hAvE not BEEn rECognizED
C．Bring ABout Both positivE AnD nEgAtivE rEsults
D．ArE ChAnging in rECEnt timE