高中英语 Unit22 lesson 1 教学课件 北师大选修8

1、2021/8/11 星期三1英语：Unit22 lesson 1 教学课件（北师大版选修8）2021/8/11 星期三2Lesson 1Global Warming 2021/8/11 星期三3Appreciation of a film trailer2021/8/11 星期三4Words previewconsensusbeyondclaimrelevantraybouncepinn. 一致的意见prep. 超出vt. 声称adj. 有关的n. 光线vi. 反弹vt. 固定2021/8/11 星期三5agriculturecoincidencecondemndroughtfederalre

2、servationsacrificeWords previewn. 农业n. 巧合vt. 宣判死刑,注定毁灭n. 旱灾adj. 联邦的n. 保留,存疑vt., vi. 牺牲,献出2021/8/11 星期三6advocaterecyclesubstitutethreatenpancakehurricaneWords previewvt. 主张,提倡vt. 回收利用n. 代替品,代用品vt. 威胁n. 薄煎饼n. 飓风2021/8/11 星期三7Expressions previewbeyond ones controllook aheadrefer toin turnlead totake ac

3、tionahead of超出的控制，不受的控制展望未来指,意即依次引起,导致采取行动在前面2021/8/11 星期三8Look at the pictures and what do you know about global warming. 2021/8/11 星期三92021/8/11 星期三10 The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, n

4、itrous oxide, and methane, for example) trap energy from the sun. Without these gases, heat would escape back into space and Earths average temperature would be about 60F colder. Because of how they warm our world, these gases are referred to as greenhouse gases. The Greenhouse Effect2021/8/11 星期三11

5、The Greenhouse Effect 2021/8/11 星期三12 Without this greenhouse heating, the Earths average temperature would be only about -73 C (-100 F); even the oceans would be frozen under such conditions, such as the Moon and the Mars. MarsMoon2021/8/11 星期三13What Are Greenhouse Gases? Some greenhouse gases occu

6、r naturally in the atmosphere, while others result from human activities. Naturally occurring greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Certain human activities, however, add to the levels of most of these naturally occurring gases .2021/8/11 星期三14 Owin

7、g to the rise in atmospheric carbon dioxide caused by modern industrial societies widespread combustion of fossil fuels (coal, oil, and natural gas), the greenhouse effect on Earth may be intensified and long-term climatic changes may result. 2021/8/11 星期三15Reading Before you start Which countries d

8、o you think contribute more to global warning? a) developed countries b) developing countries more industry and technology2021/8/11 星期三16What effect will global warming have on the sea and the living things in the sea?2021/8/11 星期三17What will happen with global warming?2021/8/11 星期三18Will global war

9、ming affect the life of North Polar Bear?2021/8/11 星期三19What will happen to penguins because of global warming?2021/8/11 星期三20 Read the text and answer these questions. 1) What is global warming? Global warming refers to an average increase in the Earths temperature that, in turn, leads to climate c

10、hange. 2) What human activities are causing global warming? Industry, agriculture, the cutting down of forests, the increase in transport and the burning of fuels are causing global warming. 2021/8/11 星期三21 3) By how much has the global average temperature increased in the last 100 years? By 1F (One

11、 degree Fahrenheit) 4) Are greenhouse gases necessary for life on Earth? Yes, they are. Because they trap heat from the sun in the Earths atmosphere. Otherwise the Earth would be cold and unsuitable for life.2021/8/11 星期三22 5) How can we help solve the problem of global warming? We can make small ch

12、anges like taking public transport, recycling, using low-flow shower heads, buying light bulbs that use less energy, using recycled paper and switching off the lights when we leave a room.2021/8/11 星期三236) What are the would-be consequences of global warming? It will cause more frequent flooding, he

13、at waves and droughts. And serious diseases will spread and industries that rely on nature such as fishing will be badly affected. It will cause the polar ice to melt, raising sea levels, and flooding many islands and cities.2021/8/11 星期三24What will you do every day to help reduce greenhouse gases?2

14、021/8/11 星期三25 In some cases, it only takes a little change in lifestyle and behavior to make some big changes in greenhouse gas reductions. For other types of actions, the changes are more significant. When that action is multiplied by the 1.3 billion people in China or the 6 billion people worldwi

15、de, the savings are significant.2021/8/11 星期三26Taking public transport like buses can reduce greenhouse gas emissions. 2021/8/11 星期三27And taking train can also help a reduction of greenhouse gas. 2021/8/11 星期三28The recycling symbol Buy the recycled productsRecycled products2021/8/11 星期三29Recycling t

16、he bottles2021/8/11 星期三30Paper recycling your paper could become part of a road or race-track2021/8/11 星期三31using low-flow shower headsbuying energy-efficient light bulbsreplacewith2021/8/11 星期三32Language points2021/8/11 星期三331. Scientists have reported that human beings are causing changes in the E

17、arths climate-something _ seen as _.previously beyond our control2021/8/11 星期三34beyond 在那边/超出的范围This book on literature is beyond our reach. This bicycle is beyond repair.2021/8/11 星期三352. They claim that gases pumped into the Earths atmosphere by the factories and vehicles have been speeding up the

18、 process of global warming and affecting our climate. What is the function of the underlined part “pumpedvehicles”?2021/8/11 星期三36It is used as attributive (定语).speed up 反义: slow down affect have a bad effect on sth. 3. Global warming _ an average increase in the Earths temperature that, in turn, _

19、climate change.refers to leads to2021/8/11 星期三371) refer to 提到,谈到Dont worry. I dont think the manager referred to you.Promise me not to refer to the matter again.2021/8/11 星期三382) lead to(1) 通向 This road leads to the library. (2) lead to=result in=bring about The fight led to their divorce.2021/8/11

20、 星期三394. increaseby 增加了 increaseto 增加到The temperature of the room is increased by 12C, that is, the temperature of the room is increased to 29C.Cf : reduceby / reduceto rise by / rise to 2021/8/11 星期三405. insist: (1) urge in a forcible manner 坚决主张, 坚决要求e.g. He insisted I (should) go with them. =He i

21、nsisted on my going with them. 2021/8/11 星期三41 6. release: (1) allow to go; set free 释放 When coal is burning, it will release a lot of carbon dioxide into the atmosphere.(2) allow (news/films) to be known or published 发布,发行 The news has been released. 2021/8/11 星期三427. quantity: (1) the property of

22、things which can be measured, e.g. size, weight, number. 物质的属性,量e.g. I prefer quality to quantity. 2021/8/11 星期三43(2) amount, sum or number 数量e.g. Weve had quantities of rain this summer. 今年夏天雨下得很多。 He buys things in quantity / in large quantities. 他总是大宗采购东西。2021/8/11 星期三448. pin sth. on somebody 把某

23、事归罪于某人汤姆是无辜的,他们只是想把责任推给他。Tom is innocent. They just tried to pin the blame on him.2021/8/11 星期三459. add up 加起来total up / add up to =total up to 加起来为He added up the numbers and the numbers added up to 233.2021/8/11 星期三46TranslationHis honesty is beyond question.他的忠诚是毋庸置疑的。食用过多的糖会引起健康问题。Eating too muc

24、h sugar can lead to health problems.我们坚决要求全额退款。We insisted on a refund of the full amount.2021/8/11 星期三47Grammar1. Human beings are causing changes in the Earths climate. to report that Ex 6: What verbs are used in the text to report these statements?2021/8/11 星期三482. Gases pumped into the Earths at

25、mosphere have been speeding up the process of global warming. to claim that 3. Global warming could be one of the biggest environmental problems facing the 21st century. to believe that 2021/8/11 星期三494. Global warming is mostly due to human activities. to insist that 5. Global warming will cause te

26、rrible climate changes including more frequent floods, heat waves, and droughts. to warn that 2021/8/11 星期三50Ex 7: Look at these sentences from the text and explain why the underlined verbs are not of the same tense as the reporting verbs.Recent reports warned that global warming will cause terrible

27、 climate changes.2021/8/11 星期三512. Scientists found that the temperature of the Earth is controlled by greenhouse gases.Answers: 1) because it is in the future 2) because it is a general truth2021/8/11 星期三52Ex 8. Match the sentences with appropriate reporting verbs from the list. Then write the repo

28、rted sentences.admit/report/forbid/ask/invite/order/suggest/threatenWell close credit lines if you dont reduce the amount of carbon dioxide you produce.2021/8/11 星期三532. OK, youre right, some poisonous chemicals did escape into the atmosphere.3. Why dont you drop in tonight ahead of your meeting?4.

29、Stand up immediately!5. You cant use the dictionaries during the test.2021/8/11 星期三546. Shall we have pancakes with honey?7. Is the bus service running according to the timetable today?8. The fire has luckily caused no loss of life.2021/8/11 星期三551. They threatened to close our credit lines if we do

30、nt reduce the amount of carbon dioxide we produce.2. They admitted that some poisonous chemicals had escaped into the atmosphere.The answers2021/8/11 星期三563. He/ She/ They invited me to drop in tonight ahead of my meeting.4. He/ She/ They ordered me to stand up immediately.5. He/ She/ They forbade u

31、s to use our dictionaries during the test. 2021/8/11 星期三576. She/ He/ They suggested having pancakes with honey.7. I/ He/ She/ They/ We asked if the bus service running according to the timetable today.8. He reported that the fire had luckily caused no loss of life.2021/8/11 星期三58Ex 9. Use the follo

32、wing verbs to report the two dialogues.a) Tom advised John not to play the game today. John admitted that Tom was right because he was still a little bit ill. He promised not to work too hard. Tom warned John to be careful because if he ran around too much in this weather he might get another attack