Unit 2 Topic 2 Section C课件- 2024-2025学年仁爱科普版英语九年级上册

Unit 2 Topic 2 All these problems are very serious. Period 4 1 Read the passage quickly and divide it into different parts. 1 6 5 4 3 2 7 Activity 1 Read Paragraph 1 and answer the questions. 1.How old is the earth? 2.How long have we humans lived on the earth? 3.What does our planet mean here? Activity 2 4.6 billion years old. Only 35 000 years . The earth. Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph. A. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide 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 we’ve done are very good for the earth while others 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 Activity 3 Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph. 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. Traffic pollution Factory pollution Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph. A. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide _____________ Around the earth, there’s 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. The ozone hole Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph. A. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide ________________ 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 can’t 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 Read through a text carefully in order to get particular (特定的) information. Scanning Fewer trees Traffic pollution Factory pollution The ozone hole More carbon dioxide problems Activity 4 PPT下载 http:///xiazai/ Read Paragraphs 2-4 and answer the question. What effects will the problems cause? Activity 5 PPT下载 http:///xiazai/ Read Paragraph 5 and finish the tasks. 1.The word it in Paragraph 5 refers to ____. A. CO2 B. O3 C. O2 D. H2O 2.What effects will the ozone hole cause? B Activity 6 oxygen [ˈɒksɪdʒən] [ˈəʊzəʊn] ozone “______” (O3) is a special kind of oxygen. Ozone The ozone layer can protect the earth from harmful radiation. Read Paragraph 6 and fill in the blanks . Carbon dioxide (CO2) in the air has________ a lot. It mainly comes from ________ oil, coal and wood. This has formed a _______ around the earth. The heat from the sun can’t _________ so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the________ to rise and the of the earth to change. increased burning blanket escape oceans climate Activity 7 （ ）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 Choose the best title for this passage. A Activity 8 the ozone hole carbon dioxide fewer tress pollution sandstorm resource shortage global warming the greenhouse effect 18 All these problems are very serious, so we must do something now. Activity 9 Work in groups and discuss how to deal with the problems. How can we deal with the problems? 20 SHOW TIME Development ＆ Environment With the development of industry, people are faced with the problem of a worsening environment. Fish are in many rivers and lots of greenland is changing into . What are the causes of this? Firstly, too much development of natural resources has greatly damaged the balance of nature, many people only focus on the economic profits without considering any means of environmental .Secondly, the government hasn’t taken any effective for the further development of the economy, some departments only their own benefit, I think economic development and environmental protection are equally important .While industry keeps developing, more money should be spent improving the environment. disappearing desert protection measures pay attention to Activity 10 经济效益 自然平衡 关注 Listen to the material and fill in the blanks. 部门 respect care for love save protect 23 04 Homework Required homework: Do a survey of your family, relatives or friends about the knowledge of environmental protection. Optional homework: Surf the Internet to get more information about saving the earth. Do something for the earth. THANK YOU Lavf58.20.100 1656.0 Blues 1828.5707 www.1ppt.com null 2403.2646 Lavf58.20.100 $$