12．According to the passage, the majority of Facebook users are unconscious that Facebook ________.

　　A．makes big financial gain by selling their personal data

　　B．makes its free service possible by selling ad space

　　C．profits by sending targeted messages

　　D．profits by offering personal information to its users

　　答案：A　细节理解题。根据文章第一段第二、三句“Users, however, are actually paying an unconscious high price—the leak of their personal information. Facebook then attempts to make money by selling their

　　data to advertisers...”可知，A项正确。

　　13．What can be learned from the passage?

　　A．Facebook rule changes are indeed meant for the good of users.

　　B．With its trick exposed, Facebook will see its users reduced sharply.

　　C．The original business model did not bring Facebook the desired benefits.

　　D．Few Facebook users care about the leak of their personal information.

　　答案：C　推理判断题。根据文章第五段第二句“Its original business model, which involved selling ads and putting them at the side of the pages, was a total failure.”可推知，C项正确。

　　14．Which of the following is true according to the last two paragraphs?

　　A．The writer and Senator Schumer disagree sharply on this issue.

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