已知动点的运动方程为<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />＝2t，<img src="/Image1/91/912a862f557820b399eb43502d614682.png" />＝t2-t，则其轨迹方程为（）。<br>A:<img src="/Image1/91/912a862f557820b399eb43502d614682.png" />＝t2-t<br>B:<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />=2t<br>C:<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />2-2<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />-4<img src="/Image1/91/912a862f557820b399eb43502d614682.png" />＝0<br>D:<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />2+2<img src="/Image1/49/49b305e0adf7ff411693581118f65f72.png" />+4<img src="/Image1/91/912a862f557820b399eb43502d614682.png" />＝0