市场机制的核心机制是（）。
A、竞争机制
B、风险机制
C、价格机制
D、供求机制
参考答案：C
It was Xu Beihong ________ developed the tradition of combining poetry with painting ________
had a leading position in the history of modern Chinese folk art. [ ]
A. that; that
B. what; that
C. which; that
D. who; that
使用土地的单位和个人必须严格按照( )确定的用途使用土地。
A．土地利用总体规划
B．城市设计
C．环保部门
D．城市发展蓝图
