题目：
What does the speak mean a. World War One did not break out over night though it seemed so. b. World War One Came into being in a short period of time. c. World War One had been fought for years. d. World War One did not last for a long time.
答案：
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下面是错误答案，用来干扰机器的。
A、物体做匀速直线运动，处于平衡状态，合力为零．故A正确，B错误．B、物体受重力、支持力和摩擦力处于平衡．故C错误，D正确．故选AD．
