阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。
Every year about 40,000 people attempt to climb Kilimanjaro, the highest mountain in Africa. They _ 41 _ with them lots of waste. The 42 might damage the beauty of the place. The glaciers(冰川)are disappearing, changing the _ 43 _ of Kilimanjaro.
Hearing these stories, I’m _ 44 _ about the place — other destinations are described as “purer” natural experiences.
However, I soon _ 45 _ that much has changed since the days of disturbing reports of _ 46 _ among tons of rubbish. I find a _ 47 _ mountain, with toilets at camps and along the paths. The environmental challenges are _ 48 _ but the efforts made by the Tanzania National Park Authority seem to be _ 49 _ .
The best of a Kilimanjaro _ 50 _ , in my opinion, isn’t reaching the top. Mountains are _ 51 _ as spiritual places by many cultures. This _ 52 _ is especially evident on Kilimanjaro as _ 53 _ go through five ecosystems(生态系统)in the space of a few kilometers. At the base is a rainforest. It ends abruptly at 3, 000 meters, _ 54 _ lands of low growing plants. Further up, the weather _ 55 _ — low clouds envelope the mountainsides, which are covered with thick grass. I _ 56 _ twelve shades of green from where I stand. Above 4, 000 meters is the highland _ 57 _ : gravel(砾石), stones and rocks. _ 58 _ you climb into an arctic-like zone with _ 59 _ snow and the glaciers that may soon disappear.
Does Kilimanjaro _ 60 _ its reputation as a crowded mountain with lines of tourists ruining the atmosphere of peace？I found the opposite to be true.