In the past, the Park Service focused on making the big scenic parks more【C1】______and comfortable for tourists. Roads were pave

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问题     In the past, the Park Service focused on making the big scenic parks more【C1】______and comfortable for tourists. Roads were paved to allow "windshield visitors" to experience the grandeur of nature without leaving their cars, and a【C2】______number of hotels and grocery stores were permitted to open【C3】______the park boundaries.
    Now this trend is changing. Plans have been made to【C4】______the parks to their natural condition as much as possible. The objective of such a move would be to secure the preservation of the parks for future generations,【C5】______allowing present-day visitors to experience pure wilderness, 【C6】______from any obvious signs of civilization — an opportunity which is quickly disappearing in the twentieth century.【C7】______plans call only【C8】______a reduction in the number of cars【C9】______into the parks each day, but【C10】______, tourists may have to leave their cars at the gates and then either visit the park on foot【C11】______use park【C12】______, 【C13】______stores and hotels may no longer be allowed within park boundaries and even the number of campgrounds may be restricted.
    Denali National Park in Alaska serves as an excellent【C14】______for this new type of park, one which has been changed only slightly from its【C15】______state. There is only one road, unpaved in【C16】______, which cross【C17】______Denali. As car traffic is strictly limited, many visitors experience the magnificent【C18】______and wildlife from a park bus. There are no hotels or stores and only seven campgrounds within Denali’s 3,000 square miles. This【C19】______isolation offers backpackers, canoeists, and other sport enthusiasts a【C20】______physical and psychological challenge.
【C5】

选项 A、thus
B、and
C、while
D、but

答案C

解析 while用以表示对比或相反的情况。本句意为“该行动的目的是为我们子孙后代保留住公园,而同时也让当今的游人能体会到纯粹的、摆脱人类文明束缚的大自然。”
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