2. 外语
  3. In the past, the Park Service focused on making the big scenic parks more 【21】______ and comfortable for tourists. Roads were

In the past, the Park Service focused on making the big scenic parks more 【21】______ and comfortable for tourists. Roads were

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问题      In the past, the Park Service focused on making the big scenic parks more  【21】______   and comfortable for tourists. Roads were paved to allow "windshield visitors" to experience the grandeur of nature without leaving their cars, and a  【22】______   number of hotels and grocery stores were permitted to open  【23】______   the park boundaries.
     Now this trend is changing. Plans have been made to  【24】______   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,  【25】______   allowing present-day visitors to experience pure wilderness,  【26】______   from any obvious signs of civilization -- an opportunity which is quickly disappearing in the twentieth century.  【27】______   plans call only  【28】______   a reduction in the number of cars  【29】______   into the parks each day, but  【30】______   , tourists may have to leave their cars at the gates and then either visit the park on foot  【31】______   use park  【32】______     【33】______   , 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  【34】______   for this new type of park, one which has been changed only slightly from its  【35】______   state. There is only one road, unpaved in  【36】______   , which cross  【37】______   Denali. As car traffic is strictly limited, many visitors experience the magnificent  【38】______   and wildlife from a park bus. There are no hotels or stores and only seven campgrounds within Denali’s 3,000 square miles. This  【39】______   isolation offers backpackers, canoeists, and other sport enthusiasts a  【40】______   physical and psychological challenge.  
【25】
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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