听第7段材料，回答第8至10题。

8. What is the most probable relationship between the speakers?

A. Professor and student. B. Librarian and reader. C. Doctor and patient.

9. What does the man suggest about the topic?

A. Finding another topic. B. Narrowing the topic. C. Writing about every woman.

10. What will the woman do after the talk?

A. Go to Margaret. B. Publish the paper. C. Go to get a book.

听第8段材料，回答第11至13题。

11. Why is the desert cool off quickly at night?

A. It's too hot during the daytime.

B. The air is not dry enough.

C. There is no vapor in the air.

12. What is called "Artists' Palette"?

A. A part of the desert.

B. The whole desert.

C. Some rocks in the desert.

13. What do we learn from the conversation?

A. The man thinks the desert is nice.

B. The woman will go to the desert again.

C. The woman has just come back from camping.

听第9段材料，回答第14至16题。

14. What is the relationship between the speakers?

A. Project research partners. B. Teacher and student. C. Father and daughter.

15. What prevents the woman from meeting this week?

A. More important work. B. More classes. C. Two exams.

16. When will probably the speakers meet?

A. Wednesday night. B. Next week. C. Weekend.

听第10段材料，回答第17至20题。

17. What is the purpose of the speech?

A. Stressing physical exercise.