我会背，我会填。

                                                                       所见      

                                                                牧童骑_____，     

                                                                歌___振__樾。     

                                                                意欲捕鸣蝉，     

                                                                忽然_______。

如图所示，研究光的反射时，测得入射光线与镜面的夹角为40°，则入射角是        度，反射角是            度。