1、Unit 2 Saving the Earth Topic 2 All these problems are very serious.,Section C,(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 b
2、eautiful 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, e
3、verywhere, none, other.,Review,None,nobody,others,other,something,anything,everyone,anybody,everywhere,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
4、, 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,拿走,In our daily life, we should face more environmental problems. Can you say something about them?,oxygen,a special
5、 kind of oxygen called “ozone” (O3),氧气,a very big hole in the ozone layer, 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”, th
6、e 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 rise called “the greenhouse effect” or “global warming”,v.上升；起床；升起,温室效应,fewer trees,factory pollution,traffic pollution,the ozone layer,more carbon dioxide,Can you match them?,1a Read and understand. Look at the follow
7、ing 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 ma
8、ny 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
9、. 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 dea
10、d. _ 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
11、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
12、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 plan
13、et 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,4.The word it in Paragraph5 refers to _. A. CO2 B. O3 C. O2 D. H2O,5.
14、What is the best title for this passage ? Environment Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse Effect,1a Read and understand.,Write down only the key words when taking notes.,1c Complete the notes according to 1a.,Retell it,cars and buses pollute air, health proble
15、ms,pollute land and water, rivers and lakes dead,harmful radiation reaches the earth, cause cancer,factory pollution,ozone hole,more CO2,2 Surf the Internet to collect more information about environmental problems and effects. Then discuss the information in groups and take notes.,3. Combine the key
16、 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 have died
17、 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 away,
18、refer to 3. Some sentences: All these problems are very serious, so we must do something now. We can: 1. Talk about the harm of pollution. 2. Combine the key points to form a short passage.,Summary,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.,Assignment,Thank you,
