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This question has two parts. First, answer Part A. Then, answer Part B. Part A What is the main idea of the passage? a The arch is part of the history of people who traveled west from St. Louis. The museum in the bottom of the arch tells the stories of pioneers. C Many of the people who traveled through St. Louis were looking for new opportunities. People can watch boats from the top of the arch or d wander in the visitor center. S