科普版九年級英語上冊《Topic2AlltheseproblemsareveryseriousSectionC》優(yōu)質(zhì)課課件-16

1、Unit 2 Saving the EarthTopic 2 All these problems are very serious. Section C Discuss:All of the humans have a home . Its the _.Are all the things that we have done good for our planet ?What have humans done to destroy our home ?earth oxygenksdn a special kind of oxygen called “ozone” (O3)氧氣臭氧zn ozo

2、ne layer 臭氧層牘壤筢蕃丹滁聳關(guān)佾疑曜彀幕劈圳盧驥覺廒蜮存敵浜坰顳卵蕪然奕感簧蠢漱誶炒嘶鯁飽娌凜綻旎佘zn le(r) 1.Its like an umbrella of the earth and protects the earth.2.But What happens to the ozone layer(the umbrella) ? There re some holes.Good or bad?Too much harmful radiation from the sun passes _ the hole and reaches the _ directly.throug

3、hearthcarbon dioxide (CO2 )牘壤筢蕃丹滁聳關(guān)佾疑曜彀幕劈圳盧驥覺廒蜮存敵浜坰顳卵蕪然奕感簧蠢漱誶炒嘶鯁飽娌凜綻旎佘k(r)bn da:ksad 二氧化碳1.Carbon dioxide mainly comes from _,_ and _.burning oilcoalwood2. The heat from the sun cant escape（滲出）so the temperature is _.This is called “_.”risingthe greenhouse effectMore carbon dioxide around the earthN

4、ew wordstake away 拿走oxygen ksdn n.氧氣hole hl n. 洞，坑ozone layer zn le(r) 臭氧層radiation .redie()n n.放射，放射物directly drek(t)li adv. 直接地carbond dioxide k(r)bn da:ksad n. 二氧化碳form f:rm v.(使）出現(xiàn)；（使）形成 n. 種類，形式blanket blkt n.毛毯，毯子 escape skep v.逃脫，滲出，逃跑rise raz v. 上升，起床，升起The green house effect 溫室效應(yīng)referrf:(r)

5、 to v. 提到，涉及，有關(guān) fewer treesfactory pollutiontraffic pollutionthe ozone layermore carbon dioxideCan you match them?1a Read and understand. P40 1.Choose suitable tittles 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 e

6、arth 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

7、 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 carbon dioxide _ In big cities, cars and buses have polluted the air. Now many people in cities have health problems._Factories hav

8、e 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 radiati

9、on 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 Pollution The Ozone hole直接地 _ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood.

10、 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

11、 Carbon Dioxide1.The age of the earth : _2.How long have humans lived on earth ?_3.Why are more and more sorts of animals and plants disappearing ?_4._ and _ have polluted the air in big cities .5.Many rivers and lakes are _ because factories have polluted the land and the water.4.6 billion years ol

12、dFor only 35 000 years.Because forests have become deserts.CarsbusesdeadRead 1a again and finish.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 g

13、reenhouse effect, level of oceans rising, climate changecars and buses pollute air, health problemspollute land and water, rivers and lakes deadharmful radiation reaches the earth, cause cancer factory pollution ozone hole more CO2P40 1b Read 1a and complete the following tasks.2.What does our plane

14、t mean here? A. The sun. B. Mars. C. The moon. D. The earth.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.3.In the passage, “blanket” refers to _. A. carbon dioxide around the earth B. the ozone layer in the sky C. the f

15、orests around the world D. pollution all over the worldCarbon 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.P40 1b Read 1a and complete the following tasks.4.The word it in Paragraph 5 refers to _. A. CO2 B

16、. O3 C. O2 D. H2OAround 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 that has made a very big hole in the ozone layer._P40 1b Read 1a and complete the following tasks.5.What is the best title for this passage?

17、 A. Environmental Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse EffectP40 1b Read 1a and complete the following tasks.Group work: Discuss and write In our daily life , what should we do to protect the environment?請關(guān)注我們周圍的環(huán)境污染情況，呼吁同學(xué)們保護環(huán)境,保護我們美麗的家園，生活中我們應(yīng)該做到。Your passage

18、 may include：ProblemReason(原因）Harm or EffectAction(行動）We learn: 1. Some 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 sh

19、ort passage. Summary1.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.AssignmentThank you 1. The boy fell into the river, but luckily, he _ by the soldier.A. saved B. was savedC. has saved D. was saving2. Now some kinds of animals are becoming _.A. few and few B. fewer and fewerC. less and less D. more