听第二篇短文，回答第16至20小题。
(
B
)16. Where are they going to have the talk?
A. In the library.
B. At the school hall.
C. In the meeting room.
(
A
)17. What's the topic of the talk?
A. Manners in the library.
B. Ways to borrow books.
C. Books in the library.
(
C
)18. What's the first rule?
A. No photos.
B. No eating or drinking.
C. Keep quiet.
(
C
)19. What is the last rule?
A. Don't drop litter.
B. Don't write in the books.
C. Return the books on time.
(
B
)20. Why are the rules important?
A. To keep the library clean.
B. To make readers feel comfortable.
C. To help the librarians with their work.
