You put _________salt in it. [ ]
A. much
B. much too
C. too many
D. lot of
答案：A
A．内能
B．重力势能
C．弹性势能
D．动能
货币流通的最佳状态为( )。
A．供大于求
B．快速流通
C．货币均衡
D．供小于求
