—Yes,I________.
A:to buy;do
B:bought;didn't
C:buy;did
如图,抛物线y=ax2+2x﹣3与x轴交于A、B两点,且B(1,0)
除夕之夜,冰城哈尔滨是热闹的冰灯游园会,而广州则是热闹的花市,这是因为( )