促进经济稳定增长的首要任务是( )。
A．保持经济总量平衡
B．促进经济结构优化
C．提高宏观经济效益
D．实现效率和公平的有机结合
参考答案：A
21×9=189
321×9=2889
4321×9=38889
（ ）×9=（ ）
（ ）×9= （ ）
A number of bricks were purchased to build a fireplace, at a cost of 40 cents each, but only
of them were needed. If the unused 190 bricks were returned and their cost refunded, what was the cost of the bricks used to make the fireplace
of them were needed. If the unused 190 bricks were returned and their cost refunded, what was the cost of the bricks used to make the fireplace