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 They may see close-ups (细节,近景) of historical
documents.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】______
【M10】

选项

答案将However改为Or。

解析 however常常表示转折,可译为“然而”,or则表示“选择”,译为“或者”。根据上文内容和此句的意思,它们中间并没有转折的含义,用表示“两者居其一”的连词or,则更符合句意。
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