二、阅读下面短文，从短文后的选项中选出最佳选项填入空白处。选项中有一项多余选项
People are familiar with the ancient Silk Road, but not everyone knows about the Heri Corridor and the Qilian Mountains. They are two of the important parts of the ancient Silk Road.
Northwest China’s climate is mostly dry and desert-like. 1. The Heri Corridor was an important part of those people’s journey and made their journey less difficult because it connected oases（绿洲）along the way. Until now, it is still an important place.
Since ancient times, the Qilian Mountains have been the most important water provider in the Heri Corridor. There are over 1,000 km of glaciers（冰川）. The glaciers provide water for people in the Heri Corridor. 2. The glaciers’ change has a big influence on the development of the area.
3. But due to human activities, the environment there was once in a bad situation, and the number of plants and animals dropped dramatically（显著地）.
In order to protect the Qilian Mountains, the government made a plan to build a national park. 4. Now there are more wild animals living there again.

A. The Qilian Mountains are also home to many plants and animals.
B. With the help of local people and scientists, the environment became much better.
C. However, these glaciers are getting smaller rapidly because of climate change nowadays.
D. Such an environment made it very difficult for the ancient Chinese to travel to the West.
E. Many ancient traders travelled through the Hexi Corridor and left behind amazing stories.

1. D 2. C 3. A 4. B