一、主题
本节教材是实施新的课程改革后高二的一堂课。本堂课是开放日的一堂公开课，所采用的的教学法是分组讨论和自由发言，为学生主动参与本单元的各项活动作好准备。
二、背景
本教学案例是人教版高二英语Unit 4 Global Warming 中的Speaking 部分，执教者是曾老师。本课是一堂口语课，在Warming up部分，主要通过六个问题导入新课，即：1.water pollution 2. air pollution 3. desertification 4.endangered wildlife 5. litter 6.global warming, 让学生分组讨论环保的重要性。通过让学生分组讨论，引导学生用英语说出如何进行环境保护，达到提高学生说英语的能力，同时也有利于增强学生的环保意识。
三、情境描述
Step1. Giving instruction
T: I give a brief intriducion to the environmental problems.On the blackboad the , I give you 6 topics about the problems. 1.water pollution 2. air pollution 3. desertification 4.endangered wildlife 5. litter 6.global warming. You are divided into 6 groups . You come to the front to give a report on the topic you chose ahead of time. You reports must contain three parts . They are phenomena , effects and measures.
Step2. Report from different groups
Group 1：water pollution: good water , good luck, kills the fish and other water animals, Water pollution is a serious environmental problem.
Group 2：air pollution: S harmful gases ,pollutants can be released by individuals, homes, automobiles, and industry. Cigarette smoke contains chemicals that cancause cancer,a gas which stops oxygen being taken into the blood and a substance called nicotine which raises blood pressure and makes the heart beat faster.
Group 3：desertification oki Do you know that more than 70％ of earth′s dryland is affected by desertification ? Dust from deserts and drylands are blown into cities around the world. The result is the destruction of topsoil followed by loss of the land′s ability to sustain crops, livestock or human activity. Ngoiukdowlsa；aowijjdkloqyyt
Group 4：endangered wildlife: Don’t kill wild animals.Milu deer die out.
Group 5：litter : cause SARS, bad for environment .Don’t throw rubbish away.Protect our environment.
Group 6：global warming : Have you noticed that it’s getting warmer and warmer every year? That’s because of air pollution. Scientists tell us that because of air pollution, the earth’s heat cannot escape. This is known as global warming If this situation is allowed to continue, it will just keep getting hotter and hotter. Then, can you imagine what will happen? We should all, therefore, do our best to stop polluting the air and help to save the world.
Step3. Discussion on how to protect our environment
S1: Don’t kill wildanimals, don’t cut down trees.
S2: Plant more trees.
S3: Animals are our friends .
S4: Government should take measures to protect our environment
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四、案例分析
本节课遵照新课程标准的理念来设计，面向全体学生，采用活动式教学途径，让学生在老师的指导下，通过体验、参与和合作等方式，促进了学生装语言实际运用能力的提高。其忧点有：
1．现新课改理理念，让学生自己去找信息，以学生为主体，培养学生合作学习、探究学习。
2．学习是教师的主动脉导的教和学生主体的学的双边活动，这一堂课做到老师少讲精讲，学生活动的时间多，使学生在一种自然、真实的的情景中体会和学习语言。
3．小组分工协作，共同完成任务。让学生在讨论中亲身体验和实践语言，让学生真正把语言当作交际工具来运用。讨论本身既是师生之间的交流，更重要的是学生之间的交流，学生通过讨论一起来了解和学习水资源的基本概况，有利于培养学生互相配合、集体协作的意识，培养学生的思维能力和创新能力，一旦学生养成了良好的合作意识，参与到这一特定的任务活动中，学生通过讨论交流完成任务来获得和积累相应的学习经验，享受成功的喜悦，提高他们的学习积极性。
4．在授课过程中，老师教态自然，以学生为主体，达到口语为主，活动为主，完成教学任务。
不足之处：目前咱们国家提唱节约中国，如果能就这一话题进行讨论，即怎样take actions, 更能达到环保目的。
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