1. The underlined word "spam" in th

1. The underlined word "spam" in the passage means_________.A. letters B. products C. useless information D. poisonous information2 .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 (禁止的) 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.3. Parental controls are needed when children use the Internet because_____.A. children can’t use the computers wellB. children may damage the computersC. the Internet is sometimes unsafe for childrenD. poisonous information may have a bad effect in children4. The harm of a computer virus is that______.A. it can change the saved data in computerB. it can reproduce itselfC. it can make the computer operator illD. it can destroy not only the saved files but also the computer itself5. We can infer from the passage that the key to solve the problems with the Internet is_____.A. to improve the computers B. to improve people’s moral (道德) levelC. to forbid people to use the Internet D. to find a medicine to kill computer viruses.