题目内容
48._____ refers to software that generates advertisements and installs itself on your computer when you download some other, usually free, program from the Web.
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50.Spyware is also known as ____.
51.A _____ consists of one line of information for every visitor to a Web site and is usually stored on a Web server.
52.A _____ records information about you during a Web surfing session such as what Web sites you visited, how long you were there, what ads you looked at, and what you bought.
57._____ are types of hackers who break into other people's computer systems and may just look around. They may steal credit card numbers or destroy information, or otherwise do damage.
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