题目内容
50.Spyware is also known as ____.
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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.
60.A(n) ______ is hardware and/or software that protects a computer or a network from intruders.
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