The first civilizations in Asia formed along the _____ and ____ River valleys around _____ BC.
AIndus; Yangtze; 6000
BIndus; Yellow; 3000
CIndus; Yellow; 4500
DYangtze; Yellow; 2000
AIndus; Yangtze; 6000
BIndus; Yellow; 3000
CIndus; Yellow; 4500
DYangtze; Yellow; 2000