—She____(visit) her grandparents. She usually____(visit) them on Sundays. She____(visit) them again this Sunday.
甲以乙为参照物是静止的,甲以丙为参照物是运动的,则乙以丙为参照物应是( )
在平面直角坐标中,已知点P(a,5)在第二象限,则点P关于直线m(直线m上各点的横坐标都是2)对称的点的坐标是( )