以下是一道SAT阅读理解真题：
Passage 1:The passage is an excerpt from a book about wolves. The wolves in Yellowstone National Park are now a top tourist attraction. In the early years after re-introduction, wolf-watching tours were not necessary, as wolves were readily visible from Mammoth Hot Springs and other areas of the park. Today, however, the wolf population has spread out over the park and other areas, and frequent wolf sightings are not always guaranteed, even for those who venture into the backcountry. What can be inferred about wolf-watching tours in Yellowstone National Park?A. They are a new addition to the parks attractions.B. They were popular only in the early years after wolf re-introduction.C. They are needed now as the wolf population is spread out in the park.D. They were of no value to tourists who wanted to see wolves.Answer: C解析：这是一道细节题，需要你在阅读中找到正确的信息。文章的第一句话说“黄石国家公园的狼现在已成为一大旅游景点。”接着说，“在狼重新引入黄石的早期几年，不需要专门的狼观光游，因为狼很容易从瑟瑟发抖的热泉和公园其他地区就能看见。然而，如今，狼群已经散布到了公园和其他地区，即使是那些冒险进入后山的人也不能保证经常能看到狼。”因此，我们可以推断出选择C是正确的答案。