Unit 2 Topic 2 Section C课件仁爱版英语九年级上册.pptx

Unit 2 Saving the Earth Topic 2 All these problems are very serious Section C,Language goals,By the end of the class, you will be able to 1.Master the following words ,phrases and sentences: Words： hole, form, rise Phrases: take away , refer to Sentences：All these problems are very serious, so we must do something now. 2. Understand the Ozone layer,(1)_ of us knows how to stop the bad behavior. (2) I knocked on the door but _ answered. (3) Some of these books are better than_. (4) She was driving the car with one hand and wiping the window with the _. (5) They are beautiful but I am looking for _ useful. (6) Is there _ you can do to help her? (7) Therere 5 000 people living here and almost _has his/her own car. (8) Hes cleverer than _ I know. (9) Ive looked _ but I cant find it.,Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other.,None,nobody,others,other,something,anything,everyone,anybody,everywhere,Revision,What can we do to protect our environment ?,Give a speech,In our daily life, we should face more environmental problems. Can you say something about them?,cities, pollute, health problems,factories, the land and the air, dead,In our daily life, we should face more environmental problems. Can you say something about them?,cut down, millions of, take away the earth, become desert,Watch the video and discuss what you have learnt from it.,Watch the video and discuss what you have learnt from it.,1.Is ozone layer important or unimportant? Its very important. 2. Can the ozone layer protect us? Yes. 3.What happened to it now? There is a big hole in the ozone layer. 4.Whats the effect of it? Its harmful to all the living things,especially to humans for it does harmto our eyes and skin.,臭氧层,Ozone is a special kind of oxygen. It can protect the earth.,氧气,In our daily life, we should face more environmental problems. Can you say something about them?,oxygen,a special kind of oxygen called “ozone” (O3),a very big hole in the ozone layer, too much harmful radiation from the sun,放射，放射物,In our daily life, we should face more environmental problems. Can you say something about them?,CO2 carbon dioxide increase a lot, form a “blanket”, the heat from the sun cant escape.,二氧化碳,渗出；逃跑；逃脱,毛毯，毯子,cause the level of the sea to rise called “the greenhouse effect” or “global warming”,温室效应,global warming,fewer trees,factory pollution,traffic pollution,the ozone layer,more carbon dioxide,Can you match them?,1a Read and understand. Look at the following pictures and predict the main idea of the passage.,Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph.,The earth is 4.6 billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things weve done are very good for the earth while some are bad. _ All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing.,Fewer Trees,A. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide,_ In big cities, cars and buses have polluted the air. Now many people in cities have health problems.,_Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead. _ Around the earth, theres a special kind of oxygen called “ozone”(O3). It is important to the earth. But now air pollution is destroying it and making a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer.,Traffic Pollution,Factory Pollution,The Ozone Layer,直接地,_ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This has formed a blanket around the earth. The heat from the sun cant escape so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change. All these problems are very serious, so we must do something now.,More Carbon Dioxide,1b Read 1a and complete the following tasks.,2.What does our planet mean here? A. The sun. B. Mars. C. The moon. D. The 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 world,D,A,1b Read 1a and complete the following tasks.,4.The word it in Paragraph5 refers to _. A. CO2 B. O3 C. O2 D. H2O,5. What is the best title for this passage ? A. Environment Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse Effect,B,A,1c Complete the notes according to 1a.,cars and buses pollute air, health problems,pollute land and water, rivers and lakes dead,harmful radiation reaches the earth, cause cancer,facto。