Read the passage below and answer the question that follows:
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1. Books were hard to get for the mountain men among the western settlers.
2. Sometimes a mountain man would carry a single battered book with him for years.
3. Some of the men had Bibles, and even more had Shakespeare's plays.
4. Shakespeare was a favorite with mountain men, even if they could not read.
5. When they found someone who could read, he was often asked to read one of Shakespeare's plays to a group over a campfire.
6. There were mountain men who could not sign their own names but could quote passages of Shakespeare by heart.
Question: Which sentence best shows the central ideaof this paragraph?