thE Author writEs oF thE DEvElopmEnt oF gEology to DEmonstrAtE______.
A．thE ChAngE oF poliCiEs in sCiEntiFiC puBliCAtions
B．thE DiFFiCultiEs oF AmAtEurs in sCiEntiFiC stuDy
C．thE proCEss oF spECiAlizAtion AnD proFEssionAlisAtion
D．thE DisCriminAtion oF proFEssionAls AgAinst AmAtEurs