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  3. If a stranger came up to you on the street, would you give him your name, Social Security number and e-mail address? Probably no

If a stranger came up to you on the street, would you give him your name, Social Security number and e-mail address? Probably no

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问题     If a stranger came up to you on the street, would you give him your name, Social Security number and e-mail address? Probably not.
    Yet people often【C1】______out all kinds of personal information on the Internet that allows such identifying data to be【C2】______. Services like Facebook and Twitter are【C3】______over with personal information.
    In social networks, people can increase their defenses against【C4】______by adopting tight privacy controls.【C5】______an individual’s actions, researchers say, are【C6】______enough to protect privacy in the interconnected world of the Internet.
    Computer scientists say that such【C7】______harmless bits of information【C8】______can increasingly be collected and【C9】______by computers to help create a picture of a person’s identity. By examining【C10】______between various online accounts, the scientists showed that they could identify more than 30 percent of the users of both Twitter and Flicker, even though the accounts had been【C11】______of identifying information like account names and e-mail addresses.
    Until now, this type of【C12】______data mining, which relies on【C13】______statistical correlations, is mostly in the【C14】______of university researchers, not identity thieves and marketers. But the F. T. C.(美国联邦贸易委员会)is worried that rules to protect privacy have not kept【C15】______of technology. The agency is【C16】______on Wednesday the third of three workshops on the issue.
    You may not【C17】______personal information, but your online friends may do it for you,【C18】______to your school or employer, location, gender and interests.
    The F. T. C. and Congress are thinking about measures like tighter industry requirements, to stop online monitoring. But Jon Kleinberg, a professor of computer science at Cornell University, is【C19】______that rules will have much impact. His advice: " When you’re doing stuff online, you should【C20】______as if you’re doing it in public—because increasingly, it is. "
【C6】
选项 A、recently
B、repeatedly
C、rarely
D、presumably
答案C
解析 副词辨义。根据前面的yet可知，此处应为一个表否定意义的副词，rarely意为“很少，难得”，故选C)。recently“最近”’；repeatedly“反复地”；presumably“大概，据推测”均不符合题意。
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