听下面一段材料，回答第1-4题。 1.Who is the speaker? A. A park manager. B. A tourist guide. C. A restaurant host. 2. What is the speaker mainly talking about? A. A historic tree. B. A well-known park. C. A famous commander. 3. What do we know about the Washington Elm? A. It was less than one hundred years old. B. It was much older than people had thought. C. Washington couldn’t have commanded under it. 4. What can we learn from what the speaker said? A. Some historical stories are untrue. B. Washington commanded the army on his knees. C. The Washington Elm was destroyed before the celebration.