单项选择题
A.Input.GetKey (KeyCode.S)B.Input.GetKeyDown(KeyCode.S)C.Input.GetKeyUp(KeyCode.S)D.Input.GetKeyDown(KeyCode S)
A.Input.GetKey (KeyCode.W)B.Input.GetKeyDown(KeyCode.W)C.Input.GetKeyUp(KeyCode.W)D.Input.GetKeyDown(KeyCode W)
A.positionB.rotationC.forwardD.up