题目

  如图所示，一束光线按图示的角度入射到平面镜上，则反射角是              度；如果光线垂直入射到平面镜上，反射角又是            度。      答案：45、0解析:略 ?What do you think we should do with the bag? ?Stop the traffic, move the bag away, and then let the traffic ________ again. A. going B. goes C. to go D. go