题目

 He was too busily occupied _____ to the show.         A. to go                  B. going            C. with going             D. in going 答案：C作图（1）作出图中物体在平面镜中所成的像（2）画出发光点s发出的光线经平面镜反射后过图中A点的光路图（3）如图，一束光射向一块玻璃砖．画出这束光进入玻璃和离开玻璃后的径迹．