Unit1WelcometotheunitReading课件--高中英语牛津译林版（2020）必修第三册.pptx

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1、Unit 1 Nature in the balanceWelcome+ReadingPay attention to the figuresrainforest The oldest living ecosystems on the planet:Some can trace their origins to 70 million years agotwo types:temperate and tropicalmake up about 6%of the surface areahome to over half of the Worlds plant and animal species

2、in addition to ingredients useful in everyday products and medicines,in fact,an estimated 70%of the plants used in cancer treatments are only found in rainforests.absorb vast amounts of carbon dioxide and convert them into oxygen,about 40%of the planets breathable air.At the current rate,rainforest

3、may completely disappear within the next century.Lead-inLet us not,however,flatter ourselves overmuch on account of our human victories over nature.For each such victory nature takes its revenge on us.Fredrich EngelsWelcome to the unitListen to the song!1.How do you understand“harm”and“alarm”?“Harm”

4、means something bad we have done to the earth,including polluting soils and seas,cutting down too many trees,etc.“Alarm”means the signal that warns us of the dangers of environmental damage,which urges us to find a solution.2.What is the massage of the song?Humans have done much harm to the Earth,an

5、d we have to take action to change this situation.The Amazon rainforest:a natural treasureWhat will be talked about in the text according to the title and the picture?What could be the genre of the article?PredictionRead the para.1.What aspects will be mentioned in the following paragraphs?Para.1:In

6、troduction to the Amazon rainforestPara.2:Basic information about the rainforestPara.3:_Para.4:_Para.5:_Plant biodiversity;levels of the rainforestAnimal biodiversity;food chainThe rainforests value to the human race;threats to the rainforestComplete part A1 on page 4 with the main idea of each para

7、graph.Fast reading:main idea6,4006,4006 million6 million8 817%17%20%20%40040040,00040,0001,3001,300Fast reading:figures1.What is the purpose of using so many figures?2.Besides just listing the figures,how does the script make the figures,the large figures in particular,understandable?To support the

8、statement and make the statement more persuasive and convincing;to vivify the figures and the facts;Think about two questions:By making comparisons with figures.a system of rootsThe forests different levels support an unbelievable variety of wildlife.the tops of the tallest treesthe mass of leaf lit

9、tershorter plants with large leavestowering ancient hardwoodsRead para.3 and figure out different layers of the forest.JaguarsInsectsAt least 87 species,including frogsLeaves and fruitLeaves and fruitMicroorganismsfeed onfeed on break break downdownfeed onfeed on feed onfeed on While a significant n

10、umber of jaguars survive here,they are only one element of this forests food chain.Read para.4 and figure out the food chain of a jaguar.1.What makes the Amazon rainforest a natural treasure according to the script?2.What is your answer to the question at the end of the script?Can we afford to damag

11、e the“lungs of the plant”?3.What can we do to help maintain a delicate ecological balance?DiscussionRead para.5 and discuss the following questions The Amazon rainforest is unique,beautiful and valuable.It contains 10%of all known species on the Earth.It produces over 20%of the planets oxygen.Its wo

12、nderful plant and animal species have enabled humans to make amazing discoveries.1.What makes the Amazon rainforest a natural treasure according to the script?No.The Amazon rainforest is far too important for us to allow it to be destroyed.It helps maintain the balance of the ecosystem and provides

13、our society with food and medicine.2.What is your answer to the question at the end of the script?Can we afford to damage the“lungs of the plant”?Reduce,reuse,and recycle.Cut down on what you throw away.Follow the three Rs to conserve natural resources and landfill space.Shop wisely.Buy less plastic

14、 and bring a reusable shopping bag.Use long-lasting light bulbs.Energy efficient light bulbs reduce greenhouse gas emissions.Also flip the light switch off when you leave the room!Plant a tree.Trees provide food and oxygen.They help save energy,clean the air,and help combat climate change.Bike more.Drive less.take public transports.3.What can we do to help maintain a delicate ecological balance?Let us not,however,flatter ourselves overmuch on account of our human victories over nature.For each such victory nature takes its revenge on us.Fredrich Engels