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!

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

　　A. letters

　　B. products

　　C. useless information

　　D. poisonous information

　　47. Why can illegal businesses operate on the Internet?

　　A. Because there is no one in charge of the Internet.

　　B. Because some people like to buy banned products on the Internet.

　　C. Because X-rated materials, cigarettes, alcohol and so on can be sold well on the Internet.

　　D. Because people who operate businesses on the Internet are criminals.

　　48. Parental controls are needed when children use the Internet because ________.

　　A. children can’t use the computers well

　　B. children may damage the computers

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