题目

13. The foreman(工头) beat him _____ , and the other workers were very angry with him. A. red-blooded              B. black and white         C. red-handed               D. black and blue 答案：D玩具汽车在水平面上运动有如下四种情形，所受合力为零的情形是A．做匀速直线运动B．做匀速圆周运动C．做匀加速直线运动D．做匀减速直线运动