[单项选择]Visiting a National Park can be relaxing, inspiring, but it can also be disturbing. As you drive into Rocky Mountain National Park, you will see starving elk, damaged mead ows and dying forests. Our parks are growing old because we have mistakenly protected them from natural processes, such as fire, predation, and insects. We believed that we were saving these remnants of wild America, but actually we have "protected" them to death. If we want to save our National Parks, the National Park Service must change its management priorities to prevent over population of animals and to restore natural process in the forest in order to prevent their stagnation and "death" by old age. We must act soon: our parks are dying of old age because we have altered the forces in nature that keep them young and strong.
By tracing the history of our National Parks, we can understand the problem and see why we need active management. In the early part of the 20th century, settlers exploited wildlife he
A. caused the near extinction of the endangered animals
B. intervened the natural process
C. made the visit of National Parks relaxing, and inspiring and rejuvenating
D. saved the elks in the Rocky Mountain Park from starvation