广播和电视对教育技术的发展有着特殊的作用。这两种视听技术在课堂上的使用并不排斥教师传授知识的主导地位。广播和电视都是纯辅助性的工具,教师可以有选择地灵活使用。然而,使用广播和电视有一个大障碍,那就是它们都必须定时播放。由于有了录音和录象的条件,教师可以根据教学要求更灵活地使用广播和电视了。我们是否可以说,教师们都已恰当而有效地使用了这些媒体呢?应该承认,这两种媒体没有起到应有的作用。这并不是因为人们认为传统教学比媒体教学好,因而就不用媒体。这 Radio and television have a special role in the development of educational technology. The use of these two audio-visual technologies in the classroom does not exclude the dominance of teachers in imparting knowledge. Both radio and television are purely supportive tools that teachers can use selectively and flexibly. However, there is a big hurdle to using radio and television, which is that they all have to be timed to play. Due to the conditions of recording and video recording, teachers can use radio and television more flexibly according to teaching requirements. Could we say that teachers have used these media properly and effectively? It should be admitted that these two media outlets did not play their due role. This is not because people think that traditional teaching is better than the media, so there is no need for media. This