阅读理解
Minqin County in Gansu Province lies between two big deserts. In the past, desertification(沙漠化) forced many villagers to move away. Now, people are fighting back by planting trees and grass.
Jiang Liling returned to her hometown to help with this work. She studied forestry and has worked on controlling the desert for 24 years. By last year, Minqin County had planted over 150,000 hectares(公顷) of forest. The area covered by forest has increased from 3% in the 1950s to 18% today. Jiang Liling and her coworkers go into the desert at least twice a year to guide the planting. They walk about 20 kilometres each day there. Sometimes, she stays there during sandstorms to test new ways of fighting the desert.
Since 2007, Minqin County has been returning farmland to forest. Jiang Liling helped with the plans and also talked to villagers who were unsure about the project. Her work helped protect 186 hectares of farmland, and this work also brought government funding to the villagers. She also taught people to grow a medicinal plant called cistanche(肉苁蓉) on the roots of saxaul trees(梭梭树). This brings in about 2 million yuan for villagers every year. Now, the environment in Minqin County is much better. People in Jiang Liling's village grow vegetables in greenhouses and have better lives.
"Minqin County is an oasis(绿洲) that stops the two deserts from merging. It will surely have a better future," Jiang Liling says.
()1. Why did many villagers leave Minqin County in the past?
A. They wanted to find better jobs in cities.
B. The government asked them to move.
C. Desertification made the land difficult to live on.
D. There was not enough farmland to grow crops.
()2. By how many percentage points(百分点) has the forest coverage in Minqin County increased since the 1950s?
A. 3
B. 15
C. 18
D. 20
()3. What is one main way Jiang Liling helped villagers make money directly?
A. By finding them new jobs in forestry.
B. By helping them build greenhouses for free.
C. By teaching them to grow a medicinal plant on tree roots.
D. By giving them government funds for protecting farmland.
()4. Which of the following best describes Jiang Liling's work?
A. Indoor and organised.
B. Tiring and meaningless.
C. Scientific but useless.
D. Challenging but helpful.
()5. What is the main idea of the passage?
A. Life in a desert environment is full of challenges.
B. The government runs tree-planting projects across China.
C. Individual efforts help fight desertification and improve people's lives.
D. Minqin County has become an area of natural beauty.

1.C 2.B 3.C 4.D 5.C

1. 细节理解题。根据原文第一段"In the past, desertification(沙漠化) forced many villagers to move away."可知，过去沙漠化迫使村民搬迁，本质是沙漠化让土地难以维持生存，对应C选项，其余选项原文均无相关表述。
2. 数字计算题。根据原文第二段"The area covered by forest has increased from 3% in the 1950s to 18% today."，计算可得18%-3%=15%，即森林覆盖率提升了15个百分点，对应B选项。
3. 细节理解题。根据原文第三段"She also taught people to grow a medicinal plant called cistanche(肉苁蓉) on the roots of saxaul trees(梭梭树). This brings in about 2 million yuan for villagers every year."可知，她教村民在树根上种植药用植物是直接帮村民增收的主要方式之一，对应C选项。
4. 推理判断题。文中提到蒋玲丽常年深入沙漠指导植树，沙尘暴期间还要留守测试治沙新方法，工作条件艰苦充满挑战，同时她的工作既改善了当地生态环境，又帮村民增收、提升生活水平，十分有价值有帮助，对应D选项。
5. 主旨大意题。全文以蒋玲丽的治沙工作为核心，讲述了个人的努力不仅有效对抗了民勤县的沙漠化问题，还带动当地村民改善了生活，对应C选项。