How to protect children web fans from unsuitable materials on-line while encouraging them to use the Internet has long been discussed in the US. For some time, the Internet seems like a forest, filled with danger for children. But forests have wonders as well as dangers, and with good guides, some education and a few precautions (预防措施), the wilds of the Internet can be safely navigated (航行). "Children have to be on-line. If we tell our children they can't have chances to the Internet, we're cutting them off from their future," said an expert.
Most children have started to use search engines. Many of them are great for finding lots of interesting Internet sites and they can also go to places where you might not want them to go. There are such engines made just for children. A certain software (软件) contains only sites that have been selected as safe. The most popular way to limit chances would be to use what is known as a "content screener (过滤器)". But this can't be wholly safe, and the best thing parents can do is to talk to their kids and let them know what is OK or not OK to see or do on the Internet. Another way is that mum or dad is nearby when the child is surfing the Internet.
A few other tips:
1) Don't put the PC in a child's room, but keep it in a place where mum or dad can keep an eye on things. That also makes the Internet more of a family activity.
2) Ask your child not to give on-line strangers personal information, especially like address and phone number.
3) Tell your children never to talk to anyone they meet on-line over the phone, send them anything, accept anything from them or agree to meet with them unless you'd like to.
56. What is the main subject about the passage?
A. Fighting against children on-line.         B. Internet in America.
C. American children going on-line.         D. Children's web sites.
57. What is the best way to protect children from improper material?
A. To talk to children and persuade them to tell right from wrong.
B. To be nearby when they are surfing the Internet.
C. To fix a content screener on the computer.
D. To buy some search engines for children.
58. Which of the following is right according to the passage?
A. Surfing the Internet is the best way of educating children.
B. Using a content screener is safe for stopping children having chances to the Internet.
C. Searching engines can stop children from reading materials unfit for them.
D. Children's not having chances to the Internet may have effect on (影响) their progress.
59. According to the passage, we can infer(推断) that _________.
A. the writer doesn't encourage children to surf the Internet  
B. the Internet has a lot of harmful sites
C. the Internet is a forest full of danger                          
D. a child who is on-line is dangerous
60. What does the passage tell us most?
A. Education.      B. Good guides.      C. Precautions.      D. Software.