21. The Travel Pavilion is built to help visitors______.

　　A. realize the importance of travelling

　　B. become familiar with mountain countries

　　C. learn how to make things such as fishing nets

　　D. learn something about different places in the world

　　22. If you are interested in knowing about what people's life will be, you may visit_____.

　　A. the Travel Pavilion B. the Future Tower

　　C. the Safari Park D. the Pyramid

　　23. If you want to get a toy lion to take home, where will you most likely go?

　　A. The Pyramid. B. The Nature Park.

　　C. The Future Tower. D. The Travel Pavilion.

The Internet has become part of teenage life.

A new report on 3,375 students aged from 10 to 18 in seven Chinese cities found that 38 percent of them believe they use the Internet often. While most of them get useful information and use the Internet to help in their studies, some are not using it in a good way.

In order to help young people use the Internet in a good way, a textbook on good Internet behavior has started to be used in some Shanghai middle schools this term. The book uses real examples to teach students all about good ways of using the Internet. The book gives useful advice such as "it's good to read news or find helpful information to study".

Some students also make online friends. But if you are meeting a friend offline, make sure your parents know. Teachers and parents all think the book is of great help. A teacher said the book would be a guide for teens using the Internet. She believes it will keep students away from bad sites. "Many students are using the Internet without guidance from their parents," she said. "The book will teach students how to be a good person in the online world."

24.The textbook mainly tells us ______.

A.why we should use the Internet

B.how to study using the Internet

C.how to use the Internet correctly

D.how to get help from others