题目内容
_______ are invisible images or HTML code hidden within a web page or e-mail message and are used to transmit information without your knowledge.
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_______ are programs that migrate through networks and operating systems and attach themselves to various other programs and databases.
A(n) _______ attempts to slow down or stop a computer system or network by sending repetitive requests for information.
A deceptive act, using the Internet, to trick people into spending their money and time for no gain is called an Internet _______.
_______ attempts to trick Internet users into thinking a fake but official-looking website or e-mail is legitimate.
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