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 They may see close-ups (细节，近景) of historical
documents.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】______
【M5】
选项
答案将which 改为 where 或在 which 前加in。
解析 laboratories 表示地点，先行词为地点，其后用关系副词where 引导定语从句，或介词+which的形式引导定语从句。由于与laboratories 连接的介词表示地点可以用in，所以，在引导定语从句中，可用in which。
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大学英语四级

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