17. What is the talk mainly about?

　 A. The history of the school. B. The courses for the term. C. The plan for the day.

　18. Where can the visitors learn about the subjects for new students?

　 A. In the school hall. B. In the science labs. C. In the classrooms.

　19. What can students do in the practical areas?

　 A. Take science courses. B. Enjoy excellent meals. C. Attend workshops.

　20. When are the visitors expected to ask questions?

　 A. During the lunch hour. B. After the welcome speech. C. Before the tour of the labs.

第二部分：阅读理解（共两节，满分40分）

第一节 （共15小题；每小题2分，满分30分）

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

A

　　This is not a diet. It's a simple way to lose weight. You don't have to give up the food you love or join a gym. You just follow some habits thin people have. Keep them, and you'll become thin.

　　Wake-up When you wake up in the morning, sit up slowly without using your hands. With legs straight out, lean forward(前俯) until you feel sore(酸痛的) in your back. It will use up 10 calories.

　　Start with soup Order a clear soup, and have it before the main food. In this way, you'll feel fuller, so you'll eat less when the main food comes.

　　An apple or more a day Apples are full of fiber(纤维) and water, so your stomach will want less. Studies show that people who eat at least three apples or pears a day may lose weight.

　　Talk it up Every time you use the cell phone, stand up and walk around. Heavy people sit on average two and a half hours more each day than thin people. This skill is very important as standing up and walking around will burn up 50 or more calories.

　　Use these skills, and you will have a big weight loss.

21. The text is to encourage you to ______.