The new system was found more effective in docume
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The new system was found more effective in document search than the_______.
A. using photos
B. description of the HTML page
C. current popular search engines
D. document search
E. information in images
F. machine vision systems
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答案：C
根据最后一段“…produced a 30 percent improvement in precision over the original search engine…”可知，新系统在文件搜索上比当前通常使用的搜索引擎更高效。