The Internet has websites with information about making bombs, breaking the law and terrorism.

　　Criminals can fool people, especially children, in chat rooms. They can spread poisonous information and attack new members.

　　The Internet is the greatest advance in communication since human emerged. But it can also like a dark alley in a dangerous part of town. Parents need to set parental controls on their children when they use the Internet. This will keep some of the bad material away from their children.

　　The Internet can be dangerous to computers, too. Some people who have evil intentions enjoy causing problems for other people they don’t even know. They create computer viruses. A computer can get virus by downloading a program that has a virus in it. Some virus come by e-mail.

　　A virus can destroy the data a person has saved in computer files. A virus can cause a computer to crash. A virus can also reproduce itself! It can send copies of itself to everyone on a person’s e-mail address list. Then these people’s computers will have the same problems and can’t work normally!

　　51. The underlined word “spam” in the third paragraph means ________.

　　A. letters

　　B. products

　　C. useless information

　　D. poisonous information

　　52. Why can illegal businesses operate on the Internet?

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