实施价格歧视的基本条件包括______。

A．市场能够有效地隔离开

B．必须有可能根据不同的需求价格弹性划分两组或者两组以上的购买者

C．生产者必须要达到一定的规模

D．不同市场上企业的边际收益相等

solve; design; go; take; learn; deal; change

小题1:He wasn’t allowed __________ swimming after school.

小题2:Books can not be __________ out of the reading room.

小题3:How _____________ with this problem is very hard. We all need a good way.

小题4:We often _____________ our problems by ourselves in the past.

小题5:He’s been ________________ English for nearly six years.

小题6:My life _______________ a lot in the last few years.

小题7:_______________ our own home is a very exciting thing.