A． They gave up poaching．
B． They killed more elephants to get the same quantity of ivory．
C． To them, game is over．
D． They realized it was illegal to slaughter elephants．
A． The rate of killing has been accelerating．
B． The US government forbids imports of both raw and finished ivory．
C． They realized that the killing of elephants is a serious threat to their tourist business．
D． African people advocated an ivory ban．