| 听下面一段材料，回答第1至4题。 |
| 1. Who do you think the speaker is? |
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| A. A visitor to the park. B. A clerk (员工) of the Park Service. C. A guide from the touring party. |
| 2. When did the National Park Service begin? |
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| A. In the early 1800's B. In the late 1800's C. In the 1700's |
| 3. What does the speaker say about the Yellowstone National Park (黄石国家公园)? |
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| A. It was the first national park. B. It is not managed by the National Park Service. C. The government hasn't declared its position in the world. |
| 4. What is one of the duties of the speaker? |
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| A. To build fire B. To guide nature walks C. To train animals. |