Unit2Topic2SectionC.ppt

《Unit2Topic2SectionC.ppt》由会员分享，可在线阅读，更多相关《Unit2Topic2SectionC.ppt（21页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、Unit 2 Saving the EarthTopic 2 All these problems are very serious. Section C cities, pollute, health problems factories, the land and the air, dead cut down, millions of, take away the earth, become desert拿走拿走 oxygen a special kind of oxygen called “ozone” (O3)氧气氧气 a very big hole in the ozone laye

2、r, too much harmful radiation from the sun臭氧层放射，放射物 n.洞，坑v.出现，形成n.种类，形式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二氧化碳毛毯，毯子渗出；逃跑；逃脱 cause the level of the sea to

3、 rise called “the greenhouse effect” or “global warming”v.上升；起床；上升；起床；升起升起温室效应温室效应fewer treesfactory pollutiontraffic pollutionthe ozone layermore carbon dioxideCan you match them?1a Read and understand.Look at the following pictures and predict the main idea of the passage. Choose suitable titles f

4、or 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._

5、 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 TreesA. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More

6、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 imp

7、ortant 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 PollutionFactory

8、Pollution The Ozone Layer直接地直接地 _ 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 le

9、vel 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 Dioxide1b 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, blanke

10、t 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. H2O5. What is the best title for this passage ? A.Environment Problems B. Pollution on the Ear

11、th C. Hope for the Future D. The Greenhouse Effect Write down only the key words when taking notes. 1c Complete the notes according to 1a. ProblemEffect on the environmentfewer trees forests become deserts, animals and plants disappeartraffic pollution greenhouse effect, level of oceans rising, clim

12、ate changeRetell it cars and buses pollute air, health problemspollute land and water, rivers and lakes deadharmful radiation reaches the earth, cause cancer factory pollution ozone hole more CO22 Surf the Internet to collect more information about environmental problems and effects. Then discuss th

13、e information in groups and take notes. 3. Combine the 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 dir

14、ty and smell terrible. Most of fish in the water have 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. S

15、ome words: hole, form, rise 2. Some phrases: take away, 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.