驾驶自行车、电动自行车、三轮车在路上横过机动车道，应当（）。
A、下车推行
B、可直接横过
C、都不得横过
参考答案：A
Now that she is out of a job, Lucy ____ going back to school, but she hasn't decided yet. [ ]
A. had considered
B. has been considering
C. considered
D. is going to consider
某同学用水平恒力F作用于质量为m的物体，使该物体在光滑的水平面上沿力的方向移动位移x，力F做功为W1；如果该同学还是用恒力F作用于同一个物体，而使它在粗糙水平面上移动同样的距离x，此时力F做功为W2。那么两次恒力做功和功率的关系为 （ ）
A．W1＞W2，P1＜P2
B．W1＝W2，P1＞P2
C．W1＝W2，P1＝P2
D．W1＞W2，P1＞P2
