I think it's too expensive. I'd like a ____ (cheap) one.
如图,在平面直角坐标系中,△ABC的三个顶点分别为A(﹣1,﹣1),B(﹣3,3),C(﹣4,1)
My sister is playing ________ piano.
下列有关人体运动的说法,正确的是( )