2. 外语
  3. Books have always been the main tools for teach. But a vast number of new 【M1】______ have come into use in this century

Books have always been the main tools for teach. But a vast number of new 【M1】______ have come into use in this century

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问题     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 aids for an example.             【M2】______
"Audiovisual " means "hearing-and-seeing". These aids 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 They may see close-ups (细节，近景) of historical
documents.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】______
【M4】
选项
答案将or改为and。
解析 此句中，动词为include(包括)强调所包括的(即其宾语)只是整体的一部分，而or 引出另一个代替的事物，表示两者居其一，这与include的意思不合，不能搭配使用。
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大学英语四级

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