In the past, the Park Service focused
on making the big scenic parks more{{U}} (21) {{/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}} (22)
{{/U}}number of hotels and grocery stores were permitted to open{{U}}
(23) {{/U}}the park boundaries. Now this trend is
changing. Plans have been made to{{U}} (24) {{/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}} (25)
{{/U}}allowing present-day visitors to experience pure wilderness,{{U}}
(26) {{/U}}from any obvious signs of civilization -- an opportunity
which is quickly disappearing in the twentieth century.{{U}} (27)
{{/U}}plans call only{{U}} (28) {{/U}}a reduction in the number of
cars{{U}} (29) {{/U}}into the parks each day, but{{U}} (30)
{{/U}}, tourists may have to leave their cars at the gates and then either
visit the park on foot{{U}} (31) {{/U}}use park{{U}} (32)
{{/U}}{{U}} (33) {{/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}} (34) {{/U}}for this new type of park, one which has been
changed only slightly from its{{U}} (35) {{/U}}state. There is only one
road, unpaved in {{U}}(36) {{/U}}, which cross{{U}} (37)
{{/U}}Denali. As car traffic is strictly limited, many visitors experience
the magnificent{{U}} (38) {{/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}} (39) {{/U}}isolation offers backpackers, canoeists, and
other sport enthusiasts a{{U}} (40) {{/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。