以劳动分工和劳动交换为核心的经济有( )。
A．商品生产
B．商品经济
C．市场经济
D．自然经济
E．社会经济
参考答案：A,B,C,E
因为215÷70=3…5，所以2150÷700=______…______．
— I promise her daughter ________ get a nice present on her birthday.
— Will it be a big surprise to her?[ ]
A. should
B. must
C. would
D. shall
