4.The researchers designed and tested a machine vision system a type ofartificial intelligence that allows computers to learn without being explicitlyprogrammed that extracts semantic (语义的) information from thepixels of photos in Web pages. This information is used to enrich thedescription of the HTML page used by search engines for document retrieval. Theresearchers tested their approach using more than 600 search queries (查询)on a database of 50 million Web pages. They selected the text-retheval searchengine with the best performance and modified it to make use of the additionalsemantic information extracted by their method from the pictures of the Webpages. They found that this produced a 30 percent improvement in precision overthe original search engine purely based on text.
23. Paragraph 1 __B__
24. Paragraph 2 __C__
25. Paragraph 3 __E__
26. Paragraph 4 __D__
A.Popularity of the new system
B.Publication of the new discovery
C.Function of the new system
D.Artificial intelligence software created
E.Problems of the existing search engines
F.Improvement in document retrieval
27. The new system does documentretrieval by __C__.
28. The new system is expected toimprove precision in __B__.
29. When performing documentretrieval the existing search engines ignore __A__
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