Every year about 40,000 people attempt to climb Kilimanjaro, the highest mountain in Africa. They ________ with them lots of waste. The ________ might damage the beauty of the place. The glaciers (冰川) are disappearing, changing the face of Kilimanjaro.

Hearing these stories, I'm ________ about the place-other destinations are described as “purer” natural experiences.

However, I soon ________ that much has changed since the days of disturbing reports of ________ among tons of rubbish. I find a ________ mountain, with toilets at camps and along the paths. The environmental challenges are ________ but the efforts made by the Tanzania National Park Authority seem to be ________.

The best of a Kilimanjaro experience, in my opinion, isn't reaching the top. Mountains are ________ as spiritual places by many cultures. This view is especially evident on Kilimanjaro as ________ 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, ________ lands of low growing plants. Further up, the weather changes—low clouds envelope the mountainsides, which are covered with thick grass. I ________ twelve shades of green from where I stand. Above 4 , 000 meters is the highland desert : gravel(砾石), stones and rocks. ________ you climb into an arctic-like zone with ________ snow and the glaciers that may soon disappear.

Does Kilimanjaro ________ its reputation as a crowded mountain with lines of tourists ruining the atmosphere of peace? I found the opposite to be true.

In New England, watching falling leaves is an eagerly expected yearly delight. The changes ______ north in Maine, then make their way south in all their brilliant, colorful glory.

One spot in Maine—Acadia National Park—is a unique leaf-watching ______ . People drive hours to see the ______ moment. They drive on the park's roads, bike and hike through its wonderful forests, and sigh at the beauty of autumn ______ reflected in calm lakes.

This national treasure ______ to me for more than its natural beauty. To me, it represents the lasting, positive influence that an act of ______ can have on the world

In the early 1900s, John. Rockefeller, Jr., a supremely wealthy man, purchased a summer home in Seal Harbor, Maine, and fell in love with the natural ______ of Mount Desert Island. After retiring from the business world, he turned his ______ to charity. In his lifetime, he ______ nearly $540 million to causes he cared about.

One of these was ______ the area that was fixed in 1929 Acadia National Park. Rockefeller ______ large areas of land on Mount Desert Island, designed and built 57 miles of graceful "carriage roads" that he hoped would ______ automobile traffic in the park. He eventually donated 11,000 acres of his land to the park, and worked with other wealthy landowners to encourage them to do the ______ .

This story shows the lasting ______ that a generous mind can have on the world. Instead of ______ their pieces of this beautiful planet all for themselves, Rockefeller and others devoted their time, energy and resources toward preserving that ______ for leaf-observers, wonder-seekers and all who have faith that the ______ world is the one everyone can enjoy.

A century later, each of us can ______ from their generosity-and perhaps we can also become inspired to find new ______ to be generous ourselves, with our time, our money or simply our ______ .

Antarctica is the continent which is the most southern area of land on the Earth and is mostly ________ with ice. This is one of the driest and ________ places in the world. But people from all over the world come to ________ there. Near the South Pole, three thousand people live together in a place ________ Amundsen­Scott Station.

The Station ________ libraries, cinemas, shops, sports rooms, canteens and laboratories. There is electricity, and they have telephone — the system ________ they use to have a conversation with someone in ________ place. And they have     ________ — electronic machines that store information and use programs to help them find, organize, or change the information.

But the people here ________ travel by car, or train or bus, because there aren’t any roads or railways near the Station. They ________ by ship, helicopter, plane, or snow tractor, or ________ dogs.

There aren’t ________ trees or flowers there, but there are hundreds of different birds and other ________.

Most of the people here are________. They study plant and animal life and how ice ________. The ice can ________ us about changes in climate. Ray Kingman is an expert at Amundsen­-Scott Station, telling us ________ the phone, “This is my second year here. It’s a very interesting and beautiful place, but life is very ________ in winter. In summer we can go ________ in hot pools of water. We welcome newcomers here for further ________ of the continent！”