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The Qilian Mountains are full of life again! Long ago, people cut down trees and hunted animals there. But now, the mountains are healthy and green.

These big mountains stretch for 1,000 kilometers between Qinghai and Gansu. Because they are so big, they make a lot of rain. This rain helps animals like snow leopards (雪豹), wild yaks, and black-necked cranes live there.

Starting in the 1980s, people began to protect the mountains. Over the past years, they stopped people from living or working in the most important areas. Now, rare animals are coming back!

Lang Wenrui works in the forests. He says, “Fifteen years ago, I never saw snow leopards. Now I see them often! I was so excited the first time I saw one.” There are about 700 snow leopards now. They hunt other animals, which helps keep nature in balance.

The government closed 144 mines and helped people move to new homes. Now, more than 2,000 local people work as mountain protectors. They use phones and drones to keep an eye on the mountains.

The Qilian Mountains are a safe home for rare animals once again.

1.1. What happened to the Qilian Mountains in the past?

A People built homes.

B People cut down trees.

C People grew crops.

D People planted forests.

解析：选B。B 细节理解题。根据第一段中的“Long ago, people cut down trees and hunted animals there.”可知，过去人们在祁连山滥伐树木。故选B。

2.2. What does “they” refer to in Para.2?

A Animals.

B Rivers.

C Mountains.

D People.

解析：选C。C 词意指代题。结合前文“These big mountains stretch for 1,000 kilometers between Qinghai and Gansu.”可知，此处“they”指代的是祁连山。故选C。

3.3. When did people start to protect the Qilian Mountains?

A In the 1970s.

B In the 1980s.

C 10 years ago.

D 15 years ago.

解析：选B。 B 细节理解题。从第三段的“Starting in the 1980s, people began to protect the mountains.”可知，人们从20世纪80年代开始保护祁连山。故选B。

4.4. How does the government help protect the mountains?

A By building schools.

B By opening parks.

C By closing mines.

D By raising money.

解析：选C。C 细节理解题。根据第五段中的“The government closed 144 mines and helped people move to new homes.”可知，政府通过关闭矿场来保护祁连山。故选C。

5.5. What is the best title for the passage?

A The Big Mountains.

B The Return of Life.

C The Work of Protectors.

D The Future of Animals.

解析：选B。B 主旨大意题。文章主要讲述祁连山从过去被破坏到现在的生态恢复，生机回归的过程，B 选项“生命的回归”最适合作为本文标题。故选B。