题目

如图所示的四种现象中，属于光的直线传播形成的是（） A .建筑物在水中的倒影 B .影子的形成 C .雨后的彩虹 D .钢勺好像在水面处折断 答案：B As I will be away for at least a year, I’d appreciate _____ from you now and then so that I can know how everyone is getting along. A. having heard               B. to hear           C. hearing                    D. being heard