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1、Unit 2 Saving the EarthTopic 2 All these problems are very serious. Section CWatch a video and find out what environmental problems are mentioned in it.Pre-readingPre-reading a special kind of oxygen called “ozone” (O3)氧气氧气 a very big hole in the ozone layer, too much harmful radiation reaches the e
2、arth臭氧臭氧洞，坑洞，坑臭氧层臭氧层放射，放射物放射，放射物the ozone holePre-readingPre-reading出现，形成出现，形成carbon dioxide(CO2) increase a lot, form a “blanket”, the temperature is rising.二氧化碳二氧化碳毛毯，毯子毛毯，毯子上升上升the greenhouse effectPre-readingPre-readingoxygenozone (O3)the ozone holeozone layerradiationthe greenhouse effectcarbon
3、 dioxide (CO2 )formblanketrise氧气氧气臭氧臭氧臭氧层空洞臭氧层空洞臭氧层臭氧层放射，放射物放射，放射物温室效应温室效应二氧化碳二氧化碳形成，出现形成，出现毯子毯子上升上升Pre-readingPre-reading氧气氧气放射，放射物放射，放射物CO2O3形成，出现形成，出现毯子毯子上升上升Speak out the new words according to the Chinese and the pictures.Look at the following pictures and predict the main idea of the passage.
4、What is the best title for this passage ? A.Environmental Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse Effect Task 1Task 1Scan 1a and choose the best answer. While-readingWhile-readingYou may read the first paragraph or the last paragraph to find the main idea or the b
5、est title. Traffic pollution Factory pollution Fewer trees The ozone hole More carbon dioxideTask 2Task 2While-readingWhile-reading Read 1a quickly and choose the best titles for P2-6. Then choose the best structure for the passage.What is the best structure for this passage ? A.P1/ P2,P3,P4,P5,P6,P
6、7B. P1/ P2,P3,P4,P5,P6/ P7C. P1/ P2,P3,P4/ P5,P6/ P7 Before finding out the structure, youd better find out the main idea of each paragraph. Task 3Task 3Read 1a in detail and finish 1b, Question2-4. While-readingWhile-reading2.What does our planet mean here? A. The sun. B. Mars. C. The moon. D. The
7、earth.3.In the passage, blanket refers to _. A. carbon dioxide around the earth B. the ozone layer in the sky C. the forests around the world D. pollution all over the world4.The word it in Paragraph5 refers to _. A. CO2 B. O3 C. O2 D. H2OTask 4.Task 4.While-readingWhile-readingProblemCause and Effe
8、ctfewer trees cut down too many trees, forests become deserts, animals and plants disappeartraffic pollution burn oil and coal, form a blanket, heat cant escape, greenhouse effect, level of oceans rising, climate changecars and buses pollute air, health problemspollute land and water, rivers and lak
9、es deadair pollution destroy O3 and make a hole, radiation reach the earth, cause cancer factory pollution ozone hole more CO21c Write down the key words according to 1a. Work in pairsWork in pairsPost-readingPost-readingProblemCause and Effectfewer trees cut down too many trees, forests become dese
10、rts, animals and plants disappeartraffic pollution burn oil and coal, form a blanket, heat cant escape, greenhouse effect, level of oceans rising, climate changecars and buses pollute air, health problemspollute land and water, rivers and lakes deadair pollution destroy O3 and make a hole, radiation
11、 reach the earth, cause cancer factory pollution ozone hole more CO2Retell the environmental problems.Work in groups.Work in groups.Post-readingPost-readingProblemCause and EffectTalk about other environmental problems and write down the key words. Then write a short paragraph to describe one of the
12、m.air pollutionnoise pollutioncars and buses, burning oil, gas and coal, factories, do harm to health, cause breathing problems We have only one earth!We should do everything we can to protect it!Write a passage to describe an environmental problem.You may begin like this: As we all know, is becomin
13、g more and more serious. (cause and effect) , so we should do our best to. Luckily, our government is taking measures to protect from pollution2 Surf the Internet to collect more information about environmental problems and effects. Then discuss the information in groups and take notes. 3. Combine t
14、he key points in 1c and 2 to form a short passage and pay attention to the proper linking words. As we all know, water pollution is becoming more and more serious. Some factories pour waste water into the rivers. As a result, it makes the water dirty and smell terrible. Most of fish in the water hav
15、e died and we cant swim in the water. Water is very important to human beings, so we should do our best to protect and save it. Luckily, our government is taking measures to protect the water from pollution.You can write it like this:We learn: 1. Some words: hole, form, rise 2. Some phrases: take aw
16、ay, refer to 3. Some sentences: All these problems are very serious, so wemust do something now. We can: 1. Talk about the harm of pollution. 2. Combine the key points to form a short passage. 1.Read 1a.2.Memorize the useful expressions and key words which we learn today.3.Finish Section C in your workbook.4.Review Section A-C and preview Section D.
