Unit 5 A delicate world Understanding ideas (ppt课件)-2022新外研版(2019)《高中英语》选择性必修第二册.pptx

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1、 To get the detail information of the passage To know how the animals damaged the island To know what people did to solve the problem Think how to tackle the problemWhat have you know about penguins?Penguins live around the South Pole.They usually spend all their waking hours in the water.Only durin

2、g the egg-laying and mating periods do penguins actually live on land.Penguins commonly are black with black heads and white breasts.Large penguins often stand about 3 feet in height.1 Look at the picture below and answer the questions.1.What animals can you see in the picture?Penguins.2.What kind o

3、f changes would take place if cats,rats and rabbits were introduced to an environment like this?Maybe they could make the environment more active and diverse.Maybe they would hunt the birds and eat the native vegetation,thus upsetting the local ecological balance.Read the title and look at the pictu

4、re.Predict what the passage is mainly about.Macquarie Island lies in the South-west Pacific Ocean,halfway between Australia and Antarctica.Its native inhabitants encountered challenges.Human intervention led to the erosion of the original habitat,cased chaos and destroyed the ecology dramatically.2

5、Read the passage and find out what happened to Macquarie Island.Read the topic sentences;Link the topic sentences together to get the main idea of the passage;Draw the outline of the passage;Match the main idea with its corresponding paragraph.A.The rabbit problem resulted in parakeets dying out.B.T

6、he rat,mouse and rabbit problem made people realise that problems should be solved once and for all.C.I participated in a programme to tackle this very problem.D.Native inhabitants on Macquarie Island were once in perfect harmony with their natural habitat.E.People released a virus to kill rabbits a

7、nd used traps and dogs to catch the cats.F.Rats and mice brought to the island caused harm.What happened to the Macquaire Island?Non-native species introduced to Macquarie Island attacked native birds,and led to a substantial reduction of bird population and even the extinction of parakeets.In addit

8、ion,non-native species ate and devastated the native vegetation.All of this played a part in upsetting the natural harmony of the island.But now the islands ecology is on the road to recovery with human efforts.3 Choose the authors purpose in writing the passage and give your reasons.1.To analyse ho

9、w Macquarie Island was saved from destruction.2.To inform readers of the chaos caused on Macquarie Island by humans.3.To entertain readers with a funny story about what happened on Macquarie Island.4.To suggest ways in which an ecosystem can be protected.4 Organise information from the passage and c

10、omplete the flow chart.ACTION(S)Humans arrived on Macquarie Island.PURPOSE(S)To live there.To control the rats and mice.RESULT(S)Rats and mice were brought there by accident,and _.Rabbits multiplied and caused soil erosion,and _.Humans arrived on Macquarie Island.To live there.Rats and mice were bro

11、ught there by accident,and _they took over the island,eating the birds eggs and attacking baby birds.ACTION(S)PURPOSE(S)RESULT(S)To control the rats and mice.Cats were brought to the island.The cats developed an appetite for the birds.ACTION(S)PURPOSE(S)RESULT(S)Rabbits multiplied and caused soil er

12、osion,and _Rabbits were introduced to the island.To provide food for humans.the exploding rabbit population provided plentiful food for the cats.This led to more cats hunting the birds.As a result,parakeets died out in 1891.ACTION(S)PURPOSE(S)RESULT(S)A virus was released onto the island.To remove a

13、ll the rabbits from the island.Substantial reduction of rabbit population led to cats killing more native birds.ACTION(S)PURPOSE(S)RESULT(S)Traps and dogs were used.To catch the cats.The departure of the cats resulted in an increasing population of rats and mice.And the rabbit population exploded on

14、ce again.ACTION(S)PURPOSE(S)RESULT(S)Poisons and dogs were used.To remove all the remaining invading species.The island was pest-free and its ecology is on the road to recovery.ACTION(S)PURPOSE(S)RESULT(S)Decide whether the following statements are True(T)or False(F).1.Macquarie Island is a UNESCO W

15、orld Heritage Site because of its wild and natural beauty.()2.Humans intentionally brought rabbits,rats and mice to the island.()3.Humans brought cats to the island to control the rats and mice.()4.The rabbits had no immunity to the virus released onto the island,so they died out soon.()TFTF5.Humans

16、 learned a lesson from the incident:the rat,mouse and rabbit problem needed solving completely.()6.The programme that the author is to participate in will easily tackle the islands problems.()TFA.meaning that the number of cats also increasedB.killing up to 60,000 each yearC.giving it a wild and nat

17、ural beautyD.solving once and for allE.eating the birds eggs and attacking baby birds.1.The green grass and bare rock of its landscape contrast dramatically,_.2.Rats and mice quickly took over the island,_.C Complete the sentences.E 3.The exploding rabbit population provided plentiful food for the c

18、ats,_.4.The cats in consequence turned their attention and their stomachs back to the native birds,_.5.The incident made it clear that the rat,mouse and rabbit problem needed,_.A.meaning that the number of cats also increasedB.killing up to 60,000 each yearC.giving it a wild and natural beautyD.solv

19、ing once and for allE.eating the birds eggs and attacking baby birds.A B D Below is a summary of the text with some content missing.Choose the right item from the box and make the summary complete.cat,explode,invade,parakeet,harmony,penguin Macquarie Islands native inhabitants have existed in perfec

20、t 1._ for thousands of years.However,humans arrived on the island with rats and mice,which ate birds.2._ were brought to control mice,but they also ate birds.Moreover,rabbits were brought in as food for humans,harmonyCatscat,explode,invade,parakeet,harmony,penguinbut their digging caused soil erosio

21、n and increased cat population because cats also ate rabbits.Eventually,the cats also ate 3._,which led to their extinction.In the 1980s,traps and dogs were used to catch the cats,and the last cat was finally caught.Without cats,the populations of mice,rats,and rabbits 4._ again.The rabbits digging

22、caused the land to collapse and killed many 5._.Finally,humans used helicopters to drop poison in order to remove the last remaining 6._ species.In the end,Macquarie Island was pest-free and the islands ecology is finally on the road to recovery.parakeetsexploded penguins invadingNow talk about how

23、human interference led to such severe consequences for Macquarie Island.1.What is your understanding of“.we humans owe it to the island to give it a happy ending”?Nature has its own rules of living.But humans coming caused the destruction of the balance.Because of humans intervention,animals couldnt

24、 have their own way of living.So we should whatever we can to make up for our mistakes and give nature back to all the living things.2.Do you think it was right to eradicate the“pests”from Macquarie Island?Give your reasons.If you agree with the idea,you can use what people do in the passage to help

25、 you.If theres only one species on the island,do you think it is better to the environment?3.How could similar situations be avoided in the future?To avoid similar situations in the future,we should protect the natural ecosystem and be aware of the potential impact that human activities can have on

26、ecosystems.4.What language can you use to talk about cause and effect?How would you apply it to your reading and writing?Nature,to be commanded,must be obeyed.-Francis BaconOnly to obey nature in order to overcome nature.-Charles DarwinWe wont have a society if we destroy the environment.-Margaret Mead Why is ecological balance important?How can human beings keep ecological balance?

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