Unit3Lesson1TheSixthExtinction課件-北師大版高中英語必修第一冊

1、Unit 3 ConservationLesson 1 The Sixth Extinction目錄頁contentsPre-readingIPost-readingIVFast ReadingIIGrammar VIIIIntensive ReadingHomeworkPre-readingHow much do you know about extinction? Search the Internet to find some background information and share it with your classmates.Pre-reading Fast Reading

2、1. How many times up to today has life on Earth almost died out?2. About what percent of all specials on Earth became extinct during the mass extinction known as the “Great Dying”?3. What do scientists think will cause the nest mass extinction?Read and answer the questions.Fast Reading 1. It is not

3、common to see animals extinct in our planet. ()2. The death of the dinosaurs occurred in the fourth mass extinction. ()3. Species are dying out at an alarming rate. ()4. Up to three-fourths of species will be extinct if there is a sixth mass extinction. ()5. A sixth extinction is unavoidable. ( ) FF

4、TTFFast Reading: Exercise Intensive Reading1. Which of the following is not included in the causes for the last five extinctions? ( )A. Global warming.B. Volcanic eruptions.C. The decrease of the oxygen content of the sea.D. Human activity.DIntensive ReadingRead to choose the right answer.2. Which o

5、f the following doesnt belong to human activity? ( )Deforestation. B. Air and water pollution.C. Changes in sea levels.D. Overfishing.CIntensive ReadingRead to choose the right answer.3. What is the purpose of the last paragraph? ( )A. Appeal to people to protect the Earth.B. Blame people for destro

6、ying the environment.C. Urge the government to take action.D. Warn the public to reduce their destructive behaviour.AIntensive ReadingRead to choose the right answer.Read the text. Complete the notes. Then talk about the different aspects of extinctions.Intensive ReadingMeaning of extinction_The num

7、ber of extinctions that have occurred so far_How to avoid the sixth mass extinction_Main reasons that cause extinctions_Two notable extinctions and their consequences_ExtinctionPost-readingUp to now, there 1. _ (be) five mass extinctions, where entire species are wiped 2. _, among which the 3. _(thr

8、ee) one is known as “Great Dying”. There are 4. _ (vary) reasons resulting in the extinction, 5. _ (range) from volcanic eruptions to 6. _ (change) in sea levels.has beenoutthirdvariedrangingchangesRead to fill in the blanks.Post-readingMany experts believe we are entering the sixth extinction and h

9、uman activity is 7. _ (blame). The rate at 8. _ animals are dying out 9. _ (become) a cause for concern. We need to take steps to save endangered species and stop destroying 10. _ planet where we live.to blamewhichbecomestheRead to fill in the blanks.Post-readingVGrammarWriting features Writing meth

10、odsAdjectivesTheSixthExtinctionWriting style Teaching focusVerb phrasesWriting purposeWord choices Focus on grammarFocus on writing features Writing features Writing methodsWriting style Writing purposeFocus on writing features facts opinions / predictions reasons solutionsUse different colored pens

11、 to highlight at least one example for each of the four elements listed below. 1. In fact, over 90% of all species that ever lived are now extinct.2. Many scientists say we are now entering the Earths sixth mass extinction.factopinionFocus on writing features facts:In the last 500 million years, the

12、re have been five times when life on Earth has almost ended.The “Great Dying” killed 90% to 96% of all species.The fifth event, which occurred 66 million years ago, caused the death of the dinosaurs.Human activity is causing species to die out 1, 000 times faster than normal.numbersFocus on writing

13、features opinions / predictions:Many scientists say we are now entering the Earths sixth mass extinction.Scientists believe that up to three quarters of all species on Earth could die out.say, believe, think, in ones opinionFocus on writing features reasons:There is a long list of reasons why so man

14、y species are dying out: air and water pollution, forests being destroyed, factory farming and overfishing.Without forests, we would have no air to breathe and without clean water we would be unable to survive.reason, as, without sth / sb, would, cause, because, due to, since, forFocus on writing fe

15、atures solutions:We need to take steps to save endangered species, including setting up special areas where plants and animals can be protected.We need to change how we work and travelWe also need to improve our farming methods.need to do, should doFocus on writing features numbersfactsscientists /

16、experts sayreason, aswe need to solutionsreasonsopinions / predictionsexpositionTheSixthExtinctionFocus on writing features giving examples For example, we need to take steps to save endangered species, including setting up special areas where plants andanimals can be protected.Focus on writing features Writing methodsWriting purposeciting ideas from experts or authorities giving examples using datato explain what the sixth extinction is