1、20122013英语必修3外研版Module 4导学案（第7课时）（精品）外研版必修三 Module 4 Sandstorms in Asia学案课型设计与课时分配:1st period Vocabulary Learning2nd period Speaking（introduction,pronunciation,speaking1&2）3rd period Intensive Reading(reading and vocabulary) 4th period Grammar (grammar 1&2)5th period Listening(listening and vocabula
2、ry, everyday English)6th period Extensive Reading(cultural corner)7th period Writing(writing and task)Period 7 Writing (Writing and Task，Page38)The purpose of this writing is for students to describe one environmental problem and say what we should do about it. Its a good opportunity for a discussio
3、n about the problems and the solutions. After the discussion, they can write down the problems and the way to solve them.Step 1 Lead inT: Last class we have read some materials about environmental protection. Do you know some major environmental problems?S1: air pollution, petrol pollution, waste wa
4、ter and noise pollution.T: OK. There are many types of pollution. But choose a major one around you and find out the solution to solve it. Now discuss the problem in pairs and write down in a few sentences.T: Have you finished it? Ill ask some of you to read your short passage.S1: One major environm
5、ental problem is indoor air pollution. There are many sources of indoor air pollution. Tobacco smoke, cooking and heating appliances, and vapors from building materials, paints, furniture, etc. cause pollution inside buildings. Air pollution can affect our health in many ways with both short-term an
6、d long-term effects. So we shouldnt stay in the room for a long time. We need to go outdoors to breathe fresh air and do some exercises.S2: One major environmental problem is black carbon pollution. Black carbon pollution is the release of tiny particles into the air from burning fuel for energy. No
7、w it constitutes a serious and widespread problem, not only to human health, but also to the entire global environment. We must find a new and less-polluted energy to replace coal.T: Excellent! Now turn to Page40.Step 2 TaskThe purpose of this writing task is for the students to design a poster that
8、 encourages people to look after the environment.T: Read through the passages that we have read in this module and find out seven things you can do in your everyday life for environmental protection.T: Have you found them?S1: We should put waste paper in a special bag in order to recycle it.S2: We s
9、hould try to avoid using plastic bags.S3: We will put our leftover food into a special can.S4: I wont step on the grass any more.S5: I wont catch the bird.S6: I will persuade people who smoke not to smoke.S7: I will join an organization that protects the environment.T: Now prepare a large piece of p
10、aper. Think of a heading for your poster.(The teacher goes around the classroom to help students)T: Now show your headings to the whole class.S1: SAVE OUR EARTHS2: SAVE THE BIRDSS3: KEEP OFF THE GRASSS4: NO SMOKINGS5: LEFTOVER FOOD HERET: Now complete the poster with a few sentences using pictures i
11、f necessary.(Ask several students to show their posters)Show sample poster:SAVE OUR EARTHPlant trees every year.Keep off the grass.Ride a bike or walk to work or school.No smoking.Dont throw away rubbish.Step 3 WritingAsk students to read the message on an Internet environment discussion group and f
12、ind out the detailed information. Then write a message to the Internet environment discussion group to show your opinions about an environmental problem.T: Now read the message and answer the three questions on top of Page90, Activity17.(After read the passage)T: Have you found the answers? Now well
13、 check the answers. Now well come to Activity18.First you should choose a topic and then follow the instructions to write a message.Step 4 Suggested message:Im very concerned about global climate change. Its a very serious global problem today.From what I understand, there are many factors for globa
14、l warming. The doubling atmospheric carbon dioxide, a greenhouse gas, would cause rising ocean temperatures, which will cause an increase in evaporation. The added water vapor, also a greenhouse gas, will enhance the greenhouse effect, which would further increase global warming.There is evidence th
15、at for nearly two hundred years our planet has been warming. This is seen not only in climate observations, but also in some physical and biological indicators of environmental change. Some scientists, supported by concerned environmental organizations such as Greenpeace and the World Wild Life Fund
16、, have concluded that many of the patterns associated with this warming can be attributed to the growing impact of human activity on the planet. They have forecast that over the next hundred years we will create a climate on earth that will be warmer than any so far experienced by the human species.
17、 They believe that this rate of change may be unprecedented in the history of our planet and will be so great that many of our ecosystems and wildlife species will fail to adapt.In recent years, more and more people are paying attention to this problem. But few of them take the measures. We need to stop people from doing it. We should do all that we can to reduce such pollution.