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  3. A paper, Anatomy(剖析)of a Large Scale Social Search Engine, laying out a strategy for social search has been getting a good deal

A paper, Anatomy(剖析)of a Large Scale Social Search Engine, laying out a strategy for social search has been getting a good deal

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问题     A paper, Anatomy(剖析)of a Large Scale Social Search Engine, laying out a strategy for social search has been getting a good deal of attention in tech circles. It was written by Damon Horowitz and Sepandar Kamvar of Aardvark, one of several companies【C1】______on creating social search engines.
    Social search【C2】______to connect people with questions to people who can answer those questions. By contrast, regular Web searches take questions, break them into keywords, and then find Web sites that have the most【C3】______to these keywords. The idea has been floating around tech circles for years. Yahoo, among others, has tried to develop social search as a way to【C4】______Google.
    The idea has gained impulse with the increased use of Twitter and Facebook, where people【C5】______on their networks for information, blasting questions to their social networks and, getting useful, personalized【C6】______. Aardvark and its competitors are trying to create better tools for people with questions to connect to people with answers. Some people think social search has the potential to go beyond Google and【C7】______change the way people use the Internet.
    From a technical standpoint, Aardvark’s task is easier than Google’s. But there are also some【C8】______shortcomings to Aardvark’s approach. Getting answers through social search requires someone else to do something, so it cannot produce the【C9】______satisfaction that comes from typing something into a Web search box and watching a page of results appear. For Aardvark to be successful, it needs to enlist the participation of【C10】______answerers.
A)working B)researches C)aims D)responses
E)fundamentally F)specializing G)constant H)primarily
I)competent, J)significant K)relevance L)instant
M)relation N)challenge O)rely
【C4】
选项
答案N
解析 此处应为动词。结合上文可知Google属于regular Web searches，而Yahoo想发展social search，它们之间存在竞争，亦即Yahoo想通过“社会搜索”来挑战Google。challenge符合文意。
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