单选题Read the following text. Choose the best word(s) for each numbered blank and
mark A, B, C or D. In the past, the Park Service
focused on making the big scenic parks more {{U}} {{U}} 1
{{/U}} {{/U}}and comfortable for tourists. Roads were paved to allow
"windshield visitors" to experience the grandeur of nature without leaving their
cars, and a {{U}} {{U}} 2 {{/U}} {{/U}}number of hotels and
grocery stores were permitted to open {{U}} {{U}} 3 {{/U}}
{{/U}}the park boundaries. Now this trend is changing. Plans have
been made to {{U}} {{U}} 4 {{/U}} {{/U}}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, {{U}} {{U}}
5 {{/U}} {{/U}}allowing present-day visitors to experience pure
wilderness, {{U}} {{U}} 6 {{/U}} {{/U}}from any obvious signs of
civilization—an opportunity which is quickly disappearing in the twentieth
century. {{U}} {{U}} 7 {{/U}} {{/U}}plans call only {{U}}
{{U}} 8 {{/U}} {{/U}}a reduction in the number of cars {{U}}
{{U}} 9 {{/U}} {{/U}}into the parks each day, but {{U}}
{{U}} 10 {{/U}} {{/U}}, tourists may have to leave their cars at the
gates and then either visit the park on foot {{U}} {{U}} 11
{{/U}} {{/U}}use park {{U}} {{U}} 12 {{/U}} {{/U}}. {{U}}
{{U}} 13 {{/U}} {{/U}}, 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 {{U}} {{U}} 14 {{/U}} {{/U}}for this new type of park,
one which has been changed only slightly from its {{U}} {{U}} 15
{{/U}} {{/U}}state. There is only one road, unpaved in {{U}} {{U}}
16 {{/U}} {{/U}}, which cross {{U}} {{U}} 17 {{/U}}
{{/U}}Denali. As car traffic is strictly limited, many visitors experience the
magnificent {{U}} {{U}} 18 {{/U}} {{/U}}and wildlife from a park
bus. There are no hotels or stores and only seven campgrounds within Denali's
3,000 square miles. This {{U}} {{U}} 19 {{/U}} {{/U}}isolation
offers backpackers, canoeists, and other sport enthusiasts a {{U}} {{U}}
20 {{/U}} {{/U}}physical and psychological challenge.
【答案解析】[解析] section“地段、一段”；segment“部分，一部分”，a segment of orange“一片桔子”；portion“整体中的一大部分”，the front portion of a train“列车前部”；division“部门”，export division“出口部”。只有section有“路段，地段”之意。