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  3. People throughout the world enjoy hiking to wilderness campsites, usually on

People throughout the world enjoy hiking to wilderness campsites, usually on

游客2023-10-14  13
问题     People throughout the world enjoy hiking to wilderness campsites, usually on established trails. This activity is called backpacking because it involves carrying such essential camping gear as a tent, food, clothing, and sleeping bag on the back in a bag called a backpack. Backpacking is best suited for those who are in good physical condition as it may require walking several miles. Moreover it is sometimes necessary to climb steep paths on mountainsides, cross small streams, and spend long days on the trail to reach a secluded, quiet, and solitary campsite. The reward for this effort can be a serene mountain lake, beautiful views of the surrounding wilderness, and wildlife seen along the way.
    In most of the world, government agencies regulate camping activities by overseeing park systems, wilderness areas, and protected land. Some countries, however, have few regulations, and enthusiasts are allowed to camp anywhere on public land. In the United States, camping options for backpackers are abundant because of the hiking trails that crisscross lands managed by the National Park Service (a bureau of the United States Department of the Interior), the U.S. Forest Service, state parks, and the Interior Department’s Bureau of Land Management. Some land management agencies, such as the National Parks Service, require that backpackers register and obtain permits (called backcountry reservations) before entering wilderness areas. Others simply require that backpackers set up their campsite away from the trail and at least 30 meters from lakes, rivers, and streams to avoid polluting sources of drinking water. [br] American backpackers have abundant camping options thanks to ______.
选项
答案 hiking trails that crisscross lands managed by several organizations.
解析 文章第二段谈到各国对野外露营的不同政策。美国设立了很多部门进行管理，正是这些部门管理着遍布整个国家的徒步旅行路线，为旅行者提供了大量的选择。
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