Unit 5 Understanding ideas （ppt课件）-2023新外研版（2019）《高中英语》选择性必修第二册.pptx

1、Toxic chemical spill in Ohio On Feb.3,a train carrying vinyl/vanl/chloride/klrad/,a dangerous colorless gas,derailed in East Palestine of Ohio,near the border with Pennsylvania.About 50 cars crushed onto each other.Many of them contained hazardous chemicals including butyl/bjutl/acrylate/krlet/and v

2、inyl chloride,which were among the flammable liquids that authorities feared could set off a major explosion.本月3日，一列载有氯乙烯（一种危险的无色气体）的火车在俄亥俄州东巴勒斯坦与宾夕法尼亚州边界附近脱轨。事故现场约有50节车厢挤压在一起。许多车厢载有危险化学品，包括丙烯酸丁酯和氯乙烯，均属当局担忧可能引发重大爆炸的可燃液体。derail v.脱轨 hazardous adj.危险的；有害的 set off 出发；引起；动身；使爆炸 The local residents compl

3、aint of trouble breathing,noxious smells,nausea and headaches.There are also reports on deceased wildlife,including at least 3500 confirmed dead fish.“The result was destruction and possible ecological death,immediate and chronic,”said Evaggelos Vallianatos,a historian and an ecopolitical theorist.I

4、t is potentially one of the worst environmental disasters in U.S.history.noxious adj.有毒的；有害的 deceased adj.已死的；亡故的 chronic adj.长期的；慢性的 What is happening to the area according to the satellite images?The size of Aral Sea is shrinking.The climate change and overuse of water.Satellite Images of Aral Sea

5、,Central Asia(咸海/中亚地区的咸水湖)Macquarie Island麦夸里岛 mkwri MACQUARIE ISLAND:from Chaos to Conservation/kes/n.a state of complete confusion and lack of order混乱；紊乱/knsven/n.the protection of the natural environment（对自然环境的）保护Read for structureDivide the passage into several parts and find out the main idea o

6、f each part.Part 1Part 2Part 3Para.1Para.2-5Para.6The beauty of the islandThe chaos of the islandThe conservation of the islandRead for detailsRead for detailsRead para 2-3 and answer the following questions.What were brought to the island?What happened after they reached the island?took over ate at

7、tacked developed an appetite for.multiplied rapidlyate vegetationdig holessoil erosionHumans _ actions have a _ effect on ecology.negativecarelessRead for detailsRead para 4-6 and complete the chart.Humans_measures may do greater harm to ecology.improperTimepurpose(s)measure(s)result(s)To remove the

8、 rabbits.in the 1970sA virus was released.Fewer rabits but fewer birdsin the 1980sTo catch the cats.Traps and dogs were used.No cat but more rats and rabbitsafter 2006To remove all the remaining invading species.Poison and dogs were used.Pest-free and its ecology is on the road to recovery.Think&sha

9、reWhat is your understanding of“This intervention is a long,much-delayed ending to a sad story,but we humans owe it to the island to give it a happy ending”?Since it is we humans that are to blame for the ecological problem with the island,we must shoulder the responsibility to make efforts to recov

10、er the ecology of it.Think&shareDo you think it was right ro eradicate the“pests”from the island?How could similar situations be avoided in the future?To avoid similar situations in the future,we should protect the local natural ecosystem and be aware of the potential impact that human activities can have on ecosystems.