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.
1. 1. What happened to the Qilian Mountains in the past?(细节理解)
A People built homes.
B People cut down trees.
C People grew crops.
D People planted forests.
2. 3. When did people start to protect the Qilian Mountains?(细节理解)
A In the 1970s.
B In the 1980s.
C 10 years ago.
D 15 years ago.
3. 4. How does the government help protect the mountains?(细节理解)
A By building schools.
B By opening parks.
C By closing mines.
D By raising money.