As a boy, John Kerr wanted to be a park ranger （护林员）. 1 , he spent four decades at a public broadcasting's station in Boston. He 2 at the age of 65 without any particular post-career goal in mind.
After several lazy weeks, he drove to visit his family by Yellowstone. On the way he 3 stopped at the Yellowstone Park Foundation, which raised funds for the national park. As it happened, the foundation was 4 people to educate park guests on wolves. Kerr 5 for an internship （实习）.
To say that Kerr stood out in the intern crowd is a massive 6 . Most interns were college and even high school students. But, in a sense, he had been 7 for this since his youth. His outdoor adventures with his grandfather had given him a love of 8 , and he once volunteered at the local fire department on 9 calls.
From his internship, he 10 a ranger sooner, educating park visitors, making for safe 11 between guests and animals, and responding to medical emergencies. He 12 his job of what he describes as one in the most beautiful places, and moments when he treats a visitor to an 13 look at one of the park's wolves or bears through his telescope, an 14 that can move visitors to tears.
"These are 15 and all-too-rare moments, recalls Kerr. "I never forget them. "
