A:位移
B:路程
C:加速度
D:速度
— What did your father do yesterday?
— He ________ at home and read a book.
如图,Rt△OAB的顶点A(-2,4)在抛物线y=ax2上,将Rt△OAB绕点O顺时针旋转90°,得到△OCD,边CD与该抛物线交于点P,则点P的坐标为