高中英语选修六Unit4 Global warming Period 5教案 7页

Period 5　Reading and Writing 教学内容分析　　　‎ The teaching materials of this period contain three parts.The first part is the reading passage on Page 30 with the title of “What Can We Do About Global Warming？”．It consists of two letters：a request from a student for help on a school project and the reply.The letters bring students' attention to a commonly held belief that individuals are powerless to do anything about environmental problems and that it is governments that are in a position to act and have the responsibility to act.Earth Care's letter suggests ways to save energy and therefore decrease the amount of carbon dioxide that is poured into the atmosphere.‎ The second part is Exercise 2 on Page 31，which asks the students to make a poster for their school that tells students various ways they can reduce the amount of carbon dioxide in the air.‎ The third part is a writing task designed by the teacher，which asks students to write a short passage about global warming.By practicing writing the passage，students can strengthen their knowledge about global warming and develop their sense of environmental protection.‎ 三维目标设计　　　‎ Knowledge and skills ‎1．To enable the students to know how to prevent global warming.‎ ‎2．To get the students to learn the following useful new words and expressions：on behalf of，advocate，commitment，put up with，pollution，electrical，so long as，casual，and so on，motor，cans，circumstances，microwave，refresh，educator，contribution...‎ ‎3．To help the students learn how to write a poster.‎ ‎4．To foster the students' ability in skimming and looking up information in reference books and improve the students' reading ability.‎ Process and methods Reading for specific information，summarizing，discussing and practicing.‎ Emotion，attitude and value ‎1．To develop students' sense of environmental protection.‎ ‎2．To develop the students' sense of cooperation with others to solve problems.‎ 教学重、难点　　　‎ ‎1．The understanding of the reading passage.‎ ‎2．The following key phrases：make a difference，put up with，so long as ‎ ‎3．The following key sentences：‎ ‎(1)Together，individuals can make a difference.‎ ‎(2)It is OK to leave an electrical appliance on so long as you are using it...‎ ‎(3)Get your parents to buy things that are economical with energy...‎ ‎(4)Remember—your contribution counts!‎ ‎4．Teaching the students how to write a poster.‎ Step 1　Revision Check the homework of the last period.‎ Step 2　Lead－in Show the students the following pictures on the slide and ask students the following questions：‎ ‎1．Have you ever seen the film 2012?‎ ‎2．What kind of disasters have you seen in the film?‎ ‎3．What have you learnt from the film?‎ And then ask them：What causes the global warming？Lead them to tell the cause：gas emission.At the same time show the following pictures：‎ After talking about the causes of gas emission，ask students the question “What is the effect of global warming？”．Help them answer：natural disasters(flood，drought，hurricane，tsunami and tornado)，spread of diseases，sea level rising，decrease of species and so on.‎ At last，ask the question：“What can we do about global warming？” And then lead in the reading text.‎ Step 3　Skimming ‎1．Skim the first letter，and answer the questions below：‎ ‎(1)Who is the writer?‎ ‎(2)What are the two concerns of the letter?‎ Suggested answers：‎ ‎(1)A student named Ouyang Guang.‎ ‎(2)①His opinion that，as an individual，he can have no effect on environmental problems.‎ ‎②Getting some suggestions for what he can do about global warming.‎ ‎2．Read the second email，and answer the following question：‎ Does Earth Care agree with Ouyang Guang's opinion that individuals can have no effect?‎ Suggested answer：No，Earth Care does not agree.‎ Step 4　Scanning and discussion ‎ Ask students to scan the letters and list Earth Care's suggestions in the chart on P30，and discuss whether they can carry out each suggestion.Give reasons for their answers.And then ask one or two groups to make an oral report.‎ Earth Care's suggestion Can you carry it out？‎ Reasons If you are not using electrical appliances，turn them off.‎ Yes.‎ Save energy.‎ If you're cold，put on more clothes instead of turning up the heat.‎ Yes.‎ Save energy.‎ Motor vehicles use a lot of energy，so walk or ride a bike if you can.‎ Yes.‎ Save energy.‎ Recycle cans，bottles，plastics and newspapers and buy things made from recycled materials.‎ Yes.‎ Save energy.[来源:学科网]‎ Get your parents or friends to buy products that are made to save energy.‎ Yes.‎ Save energy.‎ Plant more trees.‎ Yes.‎ Plants absorb carbon dioxide from the air.‎ Talk with your family and friends about global warming and tell them what you've learned.‎ Yes.‎ Together，individuals can make a difference.‎ Step 5　Language study Show the students the following language points in the passage in a slide show.‎ ‎1．make a difference(P30)‎ ‎【原句再现】‎ Together，individuals can make a difference.‎ 众人拾柴火焰高。‎ ‎【观察探究】‎ ‎(1)The fact that I can now organize my own time makes a big difference.‎ 现在我能自己安排时间了，这对我有很大的作用。‎ ‎(2)It makes no difference to me what you say.I'm not going.‎ 无论你怎么说对我都没有影响，反正我不去。‎ ‎(3)It won't make much difference whether you go today or tomorrow.‎ 你今天去也好，明天去也好，关系不大。‎ ‎(4)She makes no difference between her two sons.‎ 她对两个儿子一视同仁。 ‎ ‎【归纳总结】‎ make a difference(to sb./sth.)意为“对某人/某物起作用、有影响”，difference前面可以加不同的修饰词，如no/some/little/much等。make a difference between...表示“区别对待……”。‎ ‎【即景活用】‎ ‎—When shall I go there?‎ ‎—It ______ whether you go today or tomorrow.‎ A．made no difference　　　　　　　　　B．made no sense C．makes no difference D．makes no sense ‎ Suggested answers：C ‎2．put up with(P30)‎ ‎【原句再现】‎ We do not have to put up with pollution.‎ 我们不必忍受污染。‎ ‎【观察探究】‎ ‎(1)I put up with her so long as I could.‎ 我尽可能地容忍她。‎ ‎(2)That lady，as a housewife，has a lot to put up with.‎ 作为一名家庭主妇，那位妇女必须要忍受许多事情。[来源:学#科#网]‎ ‎【归纳总结】‎ put up with...“容忍，忍受”， 宾语可以是人或者事物。‎ ‎【知识拓展】‎ ‎(1)bear 和stand在疑问句和否定句中和can，be able to连用，也表示“忍受”，其宾语多为事物。‎ ‎(2)live with sth.忍受某事；live with sb.和某人一起生活。‎ ‎【即景活用】‎ He behaved badly towards his wife.As a result she couldn't ______ him and left him.‎ A．come up with B．catch up with ‎ C．put up with D．live up ‎ Suggested answer：C ‎ ‎3.so long as(P30)‎ ‎【原句再现】‎ It is OK to leave an electrical appliance on so long as you are using it—if not，turn it off!‎ 只要你在使用，让家用电器开着无所谓——如果不用，就请关闭！‎ ‎【观察探究】‎ ‎(1)You can borrow my bike so long as you remember to return it as soon as possible.‎ 只要你记着尽早归还就可以借用我的自行车。‎ ‎(2)We can surely overcome the difficulties so long as we are closely united.‎ 只要我们紧密地团结在一起，我们就一定能够克服这些困难。‎ ‎【归纳总结】‎ so long as 起连词作用，引导条件状语从句，可以与as long as 互换，意思是“只要……”，前者语气较强，后者主要用于口语中。[来源:学科网]‎ ‎【知识拓展】‎ 条件状语从句的引导词还可以是if，unless，on condition that，suppose，supposing，provided(that)等。‎ ‎【即景活用】‎ ‎______ I am concerned，we should be brave and we will reach the top of the hill at last ______ we try our best to climb the hill.‎ A．So long as；as long as ‎ B．As far as；as far as C．As far as；so long as ‎ D．On condition that；as soon as ‎ Suggested answer：C Step 6　Writing ‎ ‎1．Ask the students to make a poster for their school that tells students various ways they can reduce the amount of carbon dioxide in the air.Tell students to illustrate their poster and give it a heading that will be eye－catching and will make others want to read it.‎ Suggested answer：‎ ‎2．Ask students to choose a topic from the list that they feel strongly about.Make notes on the topic using headings similar to the table in the reading task.Use the passage as a model.‎ Writing tips：[来源:学.科.网]‎ Step 1：Write out the thesis statement(point of view)．‎ Step 2：Write out the topic sentence of the first body paragraph.‎ Step 3：Give the supporting points and details about the first subtopic.‎ Step 4：Write out the topic sentence of the second body paragraph.‎ Step 5：Give the supporting points and details about the second subtopic(more body paragraphs)．‎ A sample version：‎ The Environmental Effects of Fossil Fuels There is no doubt that fossil fuels bring a lot of good to us.But do you know that many of the environmental problems our country faces today result from our fossil fuel dependence?‎ The environment faces air pollution，global warming，acid rain，and several other very serious problems because of our use of fossil fuels.Over the last 150 years，burning of fossil fuels has resulted in more than 25 percent increase in carbon dioxide in our atmosphere.‎ Carbon dioxide is one of the main factors in global warming which is negatively affecting everyone.Fossil fuels also affect water pollution，land pollution，and thermal pollution(heat pollution)．Coal mining is one of the causes of pollution in the environment.After the mining is completed，the land will remain barren.Materials other than coal are also brought to the surface in the coal mining process and these are left as solid wastes.The production，transportation，and use of fossil fuels are to blame for the effects of pollution on the environment.Then what should we ‎ do？We should spare no effort to improve our environment.Please save energy and use fewer fossil fuels in our daily lives.‎ Step 7　Homework ‎ ‎1．Master the language points in the text.‎ ‎2．Finish the writing task.‎ Step 8　Reflection after teaching ‎________________________________________________________________________‎ ‎________________________________________________________________________‎ Global Warming Solutions—What Can We Do?‎ The evidence that humans are causing global warming is strong，but the question of what to do about it remains controversial.Economics，sociology，and politics are all important factors in planning for the future.‎ Even if we stopped emitting greenhouse gases(GHGs)today，the Earth would still warm by another degree Fahrenheit or so.But what we do from today forward makes a big difference.Depending on our choices，scientists predict that the Earth could eventually warm by as little as 2.5 degrees or as much as 10 degrees Fahrenheit.‎ A commonly cited goal is to stabilize GHG concentrations around 450－550 parts per million(ppm)，or about twice pre－industrial levels.This is the point at which many believe the most damaging impacts of climate change can be avoided.Current concentrations are about 380 ppm，which means there isn't much time to lose.According to the IPCC，we'd have to reduce GHG emissions by 50% to 80% of what they're on track to be in the next century to reach this level.‎ Is this possible?‎ Many people and governments are already working hard to cut greenhouse gases，and everyone can help.‎ Researchers Stephen Pacala and Robert Socolow at Princeton University have suggested one approach that they call “stabilization wedges”．This means reducing GHG emissions from a variety of sources with technologies available in the next few decades，rather than relying on an enormous change in a single area.They suggest 7 wedges that could each reduce emissions，and all of them together could hold emissions at approximately current levels for the next 50 years，putting us on a potential path to stabilize around 500 ppm.‎ There are many possible wedges，including improvements to energy efficiency and vehicle fuel economy(so less energy has to be produced)，and increases in wind and solar power，hydrogen produced from renewable sources，biofuels(fuels produced from crops)，natural gas，and nuclear power.There is also the potential to capture the carbon dioxide emitted from fossil fuels and store it underground—a process called “carbon sequestration”．‎ In addition to reducing the gases we emit to the atmosphere，we can also increase the amount of gases we take out of the atmosphere.Plants and trees absorb CO2 as they grow，“sequestering” carbon naturally.Increasing forestlands and making changes to the way we farm could increase the amount of carbon we're storing.‎ Some of these technologies have drawbacks，and different communities will make different ‎ decisions about how to power their lives，but the good news is that there are a variety of options to put us on a path toward a stable climate.‎