市场和市场体系是商品和服务交换的载体，也是实现( )的主要渠道。
A．人均生产总值
B．国民生产总值
C．人均收入分配
D．国民收入分配
参考答案：D
You _____ pay too much attention to your reading and listening skill, for they are of great importance. [ ]
A. won't
B. mustn't
C. needn't
D. cannot
每日结算后，当会员的结算准备金低于交易所规定的最低余额时，交易所要按规定方式通知会员追加保证金。( )
