Those who have more unique usernames are more likely to be attacked.The INRIA researchers have created a tool that can check how unique a username is，and thus how easily an attacker could use it to build a profile of a person.

　　Researchers are exploring ways that the traces of data that people leave on different websites could be combined and used to track them.A 2010 paper showed that the online groups to which people belonged could be used to infer their real identity in 42 percent of cases.

　　Building profiles of consumers using online information has already become a major industry for marketers as well as online criminals.

　　【语篇解读】　研究人员发现独特的用户名，尤其是在访问过不同的网站后，很容易成为网络市场营销人员和犯罪分子跟踪的目标。

　　36．What would be the best title for the passage?

　　A．Look out for online criminals

　　B．Your username may betray you

　　C．Don't leave your traces online

　　D．A unique username is more attractive

　　解析：主旨大意题。本文是一篇研究报道，第一段第一句是本文的中心句，根据本句的内容可知B项“你的用户名可能会背叛你”最贴近文章内容。

　　答案：B

　　37．Online marketers may use your username to ________.

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