题型：阅读选择 题类： 难易度：困难
广东省深圳市桂圆中学2024-2025学年九年级上学期12月阶段学情反馈英语试题
In Gansu province, three generations of workers have worked hard to stop desertification.
Babusha,a big sand dune(沙丘) at the edge(边缘) of the Tengger Desert, was a big cause of sandstorms in the 1980s. The desert destroyed farmland and villages in its south, and affected more than 30,000 people. However, with the effort of"the six old men"and their children and grandchildren, now,a green belt, which is 10 kilometers long and 8 kilometers wide, has been built.
This project is time-consuning. Guo Chaoming and five other villagers first had the idea of renting 5,000 hectares (公顷) of sandy land to plant trees in 1981. Their original goal was to prevent sandstorms from destroying their crops. At the time, Guo, the oldest of the six, was already 61, while Zhang Runyuan, the youngest, was not yet 50.
At first, they planted 667 hectares of saplings (幼苗) . However, after the first sandstorm, no more than 30 percent survived. After countless failure, they successfully thought of the idea of burying wheat straw(埋麦秸) around trees to hold the sand.
Planting trees in desert is difficult, but taking care of them was even challenging. To protect the trees, they chose to live there for years, in a simple shelter they made from wooden poles and straw (木杆和稻草) . They used bricks(砖头) to support a cooking pot(灶台) , drank boiled water and ate steamed buns when hungry.
In the eyes of the six men, the Babusha forest farm became their most valuable possession. Even in the 1990s, when they were lack of money, they didn't cut down a single tree or grass to sell. Time passed by and four of the six passed away. But their children and grandchildren took up the torch and continued their work.
Now, the desert has changed into grassland and forest. The amount of plants has increased from less than 3% to more than 75%. In 2019, "the six old men"and their families were honored"Model of the Times"and"Most Beautiful Fighters" for their hard work.
IIUSTRATHD Build a mini solar desalination plant. It's a beautiful day, so, let's get outside and do some science. Here's an amazing experiment (实验) that uses solar energy. You will need:
◎A large bowl ◎A tall glass ◎Some salt ◎A stone ◎Some plastic wrap (包装膜) Steps: ◎Put the water into the large bowl. Put the salt in the water. ◎Put the glass in the middle of the bowl. The top of the glass must be above the water. ◎Put the plastic wrap over the bowl and the glass. Put a stone on top of the plastic wrap. ◎Put the bowl outside in the sun. What will happen? The water will get hot and then become gas. The salt will stay in the bowl, and the gas will rise and hit the plastic wrap. Then it will become water again and fall into the glass. If you take the plastic wrap off the bowl, you'll see water in the glass. If you taste the water, you'll find that there isn't any salt in it. |
试题篮
DO IT YOURSELF SCIENCESCIENCE
