D.

 Do you have some books you don’t want?
 Your old love may be someone’s new favorite.
 Bring one book to the Yuan-lin Library & get another one
 home for free!
 ★ When & How:
 July1 - March 15:
 Bring one book for one book festival card.
 July 17 - March 31:
 Bring one card for one book you like to read.
 ★ What books:
 All kinds of books EXCEPT school books, picturebooks, and dictionaries.P.S.
           ① Your book must be in good shape.
② Your book must be clean, and you can not draw orwrite on it.
 Want to know more? Please call 8358-5678.( Closed on Mondays.)
 -Yuan-lin Library-
 ＊another 另一個＊free 免費＊except 除了…以外
 ＊dictionary 字典＊shape 外形＊closed 關閉的

【題組】36. What is the book festival for?
(A) Selling(販售) old books.
(B) Giving people festival book cards.
(C) Inviting people to change(交換) books with each other.
(D) Knowing what kinds of books are clean.