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  3. People throughout the world enjoy hiking to wilderness campsites, usually on established trails. This activity is called backpac

People throughout the world enjoy hiking to wilderness campsites, usually on established trails. This activity is called backpac

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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.
Why should backpackers be required to set up their campsite away from lakes and rivers?
选项
答案To avoid polluting sources of drinking water.
解析 文章末尾提到对背包旅行者的一些要求，为了保护环境，保护水源地，他们被要求要远离河流湖泊30米以外扎营。此处对why的提问应该用动词不定式来回答。
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本试题收录于： A类竞赛（研究生）题库大学生英语竞赛（NECCS）分类
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