The Internet has become part of teenager (青少年 ) life. There is report on 3,375 students aged from 10 to 18 in seven Chinese cities. It says that 38 per cent of them believe they use the Internet often. While most of them get useful information and use the Internet to help their studies, some are not using it in a good way. Many are playing online games too much. A few even visit websites they should not look at. Bad things can happen if young people spend too much time on the Internet. In order to help young people use the Internet in a good way, a text book on good behavior ( 行为 ) has started to be used in some Shanghai middle schools this term. It uses real examples to teach students all about good ways of using the Internet. It also gives some useful advice too. For example, it's good for students to read news or search for helpful information about study; Some students also make online friends. But if you are meeting a friend online, let your parents know. Teachers and parents all think the book is a very good idea. It will teach students how to be a good person in the online world. It will be a guide for teens using the Internet and keep students away from bad sites. (1) The underlined word"it" means ____ . A. the book B. the report C. the Internet D. useful information (2)What do most of the students do on the Internet? A. To make online friends. B. To play online games. C. To get useful information to help their studies. D. To visit Web sites they should not look at. (3) What does the text book on good behavior of using the Internet NOT about? A. Real examples about good ways of using the Internet. B. How to design computer program. C. Some useful advice about using the Internet. D. Some useful advice about meeting a friend online. (4)What should students do if they meet a friend online according to the text book? A. They should let their parents know first. B. They should meet the friend online together with their classmates. C. They should call the police. D. They should meet the friend online in the daytime. (5) Why do teachers and parents think the book is a good idea? A. Because it helps with the students' studies. B. Because it gives useful information for study. C. Because it is used in Shanghai middle schools. D. Because it teaches students how to be a good person in the online world.