______ is A DEsign FEAturE oF humAn lAnguAgE thAt EnABlEs spEAkErs to tAlk ABout A wiDE rAngE oF things, FrEE From BArriErs CAusED By sEpArAtion in timE AnD spACE.
A．DisplACEmEnt
B．ArBitrArinEss
C．DuAlity
D．proDuCtivity