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?

　　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.

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

　　A. children can’t use the computers well

　　B. children may damage the computers

　　C. the Internet is always unsafe for the children

　　D. poisonous information may have a bad effect on children

　　54. The harm of a computer virus is that ________.

　　A. it can change the saved data in computer

　　B. it can reproduce the computer

　　C. it can make the computer operate ill

　　D. it can destroy the saved files and the computer itself

　　55. We can infer from the passage that the key to solving the problems with the Internet is ________.

　　A. to improve the computers

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