题目内容

__________ is computer software that secretly records information about which websites you visit.

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_______is a type of computer software that collects information about a user's browsing patterns in order to display relevant advertisements in his or her Web browser.

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A ________ is a piece of computer software that you use to search for information on the Internet, especially on the World Wide Web.

A _________ is a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws