根据以下问题的提示,用英文完成全文的简要复述。电子版提交或纸质版拍照上传均可。 Questions for précis: 1. Who runs the national parks in the United States? 2. What sort of people are the Rangers? 3. What should the Rangers be able to do? 4. Give two specific examples of what the Rangers do. 5. What are visitors to the national parks warned of and what are they expected to do? 6. What do you know about the grizzly bear? 7. How are the tourists warned concerning the grizzly bears?