Problem: The Hoover Dam is on the border of Arizona and which other state?
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A: nevada

Problem: Which was the first National Park in the United States of America?
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A: yellowstone

Problem: Olympus Mons is the tallest known volcano and mountain in our Solar System. Where is it located?
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A: mars

Problem: Little Nell is a character in which Dickens novel?
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A:
old curiosity shop