设计和运行一个有效的供应链，只对供应链核心企业至关重要。
A、正确
B、错误

A．would make learned responses when it saw the milk
B．would carry out learned movements when it had enough to drink
C．would continue the simple movements without being given milk
D．would turn its head to right or left when it had enough to drink

A.①②③
B.①③④
C.②③④
D.①②③④

A.（30000-1000）×20%
B.30000×20%
C.（30000-2000）×20%
D.（30000-2000-1000）×20%