1、Unit 4 Global warming 教学目标1. Target language 目标语言a. 重点词汇和短语energy, light (v.), heat (v.), renewable, non-renewable, fuel, blame, run outb. 交际用语Expressing agreement and disagreementYes, I agree with you.Yes, I think so.I believe that youve got it right.I dont think so.I dont think thats right.Im afra
2、id you are wrong.2. Ability goals 能力目标Enable the students to talk about different sources of energy and express their own ideas.3. Learning ability goals 学能目标Help the students learn how to give their ideas about the use of energy. 学情分析学生对全球变暖问题很感兴趣，但是对于这一话题用英语表达还存在严重不足，所以这是一个很好的让学生学习这方面词汇及句子表达的好机会。
3、重点难点Enable the students to express agreement and disagreement.4教学过程 Teaching procedures:Step 1.Leading-inPurpose: To activate Ss and arouse them to talk about global warming.T: Hello, everyone. Today we are going to read about global warming. But first let s thinkabout what moves the world around .Y
4、es, it is energy. But what is energy?Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can produce or absorb .In the past, energy was discussed in terms of easily observable effects it has
5、on the properties of objects or changes in state of various systems. Basically, if something changes, some sort of energy was involved in that change.Renewable energy sources like wind power dont emit carbon dioxide.Step 2 Warming upPurpose:Tolead Ss to the topic of this unit.Pair workGet Ss to ask
6、each other the following questions, and then ask them to present it before the class.(1)What is energy?(2) Where does it come from?(3)Whatenergy sources are renewable?(4)What energy sources are non-renewable?2. Group work(1) Get Ss to talk about sources of energy according to the following photos.Th
7、e above pictures can be used for Ss to talk about, and Ss can also talk as much as they can.By learning Warming Up we all know that energy is so important, but where does it come from?There are different forms of energy:Light energy 光能 Heat energy 热能Sound energy 声能 Chemical energy source 化学能源Nuclear
8、 energy 核能 Internal energy 内能Kinetic energy 动能 Potential energy 势能能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料(2)ConclusionWhen energy changes from one form to another, the amount of e
9、nergy stays the same. Energy cannot be made or destroyed. This fact is called“conservation of energy”. Matter can be made into energy through processes like nuclear fission and nuclear fusion.3. Competition:Take thequiz below and see whether Ss can fill in the blanks.Things thatuse energySources of
10、energyRenewable/non-renewablelightsheatingtelevisioncassette playervideo recordercomputerfridgestovewashing machinehairdryercoal(1) _oil(2) _natural gas(3) _wind (wind power)(4) _sun (solar energy)(5) _uranium (nuclear energy)(6) _water (hydro-electric power)(7) _plant waste (biomass energy)(8) _hot
11、 springs or geysers(geothermal energy)(9) _the sea (tidal energy)(10) _Suggested Answers:(1) non-renewable; (2) non-renewable;(3) non-renewable;(4) renewable;(5) renewable (6) non-renewable;(7) renewable;(8) renewable;(9) renewable;(10) renewable4. HomeworkWrite a short composition about sources of energy.