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Students in all grades use textbooks. In high school, however, students also read other kinds of books, such as novels. Some parents do not want their children to read certain novels. They ask the school to "ban," or forbid, the book. If a book is banned, people in the school can't use it and it can't be in the school library. Some great books were banned at one time or another.
What is People change their mind about which books should be banned and which ones should not be banned.