quEstions 16 to 20 ArE BAsED on thE Following tAlk.

A、rEluCtAnCE oF pEoplE in poor CountriEs to hAvE smAll FAmiliEs.
B、lACk oF BAsiC hEAlth sErviCEs AnD inEquAlity in inComE DistriBution.
C、thE DisCovEry thAt A low FErtility rAtE woulD lEAD to EConomiC DEvElopmEnt.
D、poor nutrition AnD low litErACy in mAny poor CountriEs oF thE worlD、