教学任务：阅读学生信息和语言素材，设计20分钟的英语阅读教学方案。
教案没有固定格式，但须包含下列要点：
Teaching objectives
Teaching contents
Key and difficult points
Major steps and time allocation
Activities and evaluation
教学时间：20分钟
学生概况：某城镇普通中学高中一年级学生，班级人数40人。多数学生已经达到《普通高中英语课程标准（实验）》五级水平。学生课堂参与积极性一般。（40分）
根据提供的信息和语言素材设计教学方案，用英文作答。
语言材料：
Mao Zedong wrote a poem in which he dreamed of "walls of stone to hold back clouds and rain till a smooth lake rises in the narrow gorges". Now his dream has come true. The power of the Yangtze River, which is the world’s third longest river, has been harnessed by the Three Gorges Dam. The Three Gorges Dam, which is the biggest construction project in China since the building of the Great Wall and the Grand Canal, has been built to control flooding and provide hydro-electric power for the central region of China. The dam is ncarly200 meters high and 1.5 kilometers wide. It is the largest hydro-electric power station and dam in the world and has cost more than any other construction project in history.
Sun Yat-sen, who was the leader of the1911 Revolution, first suggested the idea of a dam across the Yangtze River in 1919.Three quarters of Chinas energy is produced by burning coal. In 1993, China used 1.2billion tons of coal for heating and generating electricity. Unfortunately, burning coal causes serious air pollution and increases global warming. The dam will generate electricity equal to about 4Omillion tons of coal without causing so much air pollution.
The reservoir has flooded 2 cities, 11 counties, 140 towns and more than 4,000 villages. More than a million people who lived in the region have moved from their homes. Now they’re living a happy new life in different areas.
The Three Gorges area is one of the most beautiful areas of China and the project has flooded some of China’s most famous historical sites, including the Qu Yuan Temple, the Han Watchtower and the Moya Cliff carvings. About 800historical relics have been submerged. Some of them are being removed and some are being put into museums.
