Books have always been the main tools for teach. But a vast number of new 【M1】______
have come into use in this century. Take audiovisual for an example. 【M2】______
'Audiovisual ' means 'hearing-and-seeing'. These to learn include films, 【M3】______
television audiotapes, videotapes, slides, recordings, charts, or graphs. In many 【M4】______
there are language laboratories which students studying foreign languages can 【M5】______
listen to recordings of native speakers. The students can record their speech and play【M6】______
the tape to hear their own pronunciation. Tremendous strides have schools are now using
television with part of the regular teaching program. Hundreds of closed-circuit 【M7】______
television systems have been set in schools and colleges. There are more than 200 【M8】______
educational television stations in the United States specializing in programs of many
types. For such large audiences, television stations can spend less money to prepare 【M9】______
programs than any one school could spend. In television classrooms, students may see
expensive scientific equipment in use. They may see close-ups (细节，近景) of historical
documents. However they may hear talks by famous scientists or writers. 【M10】______
【M1】