Unit 5 Understanding ideas 课件-高中英语外研版（2019）选择性必修第二册

1、Unit5 A delicate world Understanding ideas高中英语-选择性必修二-模块五-第二课时主讲教师：李强隆（五常市第二中学校）课程审核：张佩云（哈尔滨市教育研究院）新课程新课程What animals can you see in the picture? penguin新课程一个相关视频展示新课程What kind of changes would take place if cats,rats and rabbits were introduced to an environment like this?Read the passage and find

2、out what happened to Macquarie island and answer four questions.新课程 MACQUARIE ISLAND: from Chaos to Conservation1. I am standing on Macquarie Island, in the Southwest Pacific Ocean, halfway between Australia and Antarctica. Strong winds and stormy seas have helped sculpt its long, thin shape. The gr

3、een grass and bare rock of its landscape contrast dramatically, giving it a wild and natural beauty. No visitor would think it surprising that the island is a UNESCO World Heritage Site. Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant

4、seals, existed in perfect harmony with their natural habitat for thousands of years.新课程Para1.What does the author want to tell us in the first paragraph?A. Macquarie Island has its natural beautyB. Its difficult for humans to live on Macquarie Island.C. Varieties of animals and plants live on Macqua

5、rie Island.D. Macquarie Islands native inhabitants contrast dramatically with nature.新课程2. But the islands more recent history tells a different story. Its a tragic story that began in 1810 when humans arrived on the island. In their ships they unknowingly brought rats and mice. These small animals

6、quickly took over the island, eating the birds eggs and attacking baby birds. Cats were brought to the island to control the rats and mice. Unfortunately, the cats subsequently developed an appetite for the birds, too.新课程Para2:But the islands more recent history tells a different story. Please give

7、some factors to explain this sentence.Humans arrivalRats and mice Catsate the birdseggsattacked baby birdsalso developed an appetite for the birdsfactors新课程appetite n 胃口，食欲，喜爱eg:Her husband always had a huge appetite. 她丈夫向来胃口极大。have an appetite for 对.有胃口lose ones appetite 失去胃口develop an appetite for

8、 对.产生食欲新课程3.Meanwhile, rabbits were introduced to the island as a source of food for humans. Loose on the island, they did what rabbits do best-they multiplied rapidly and began eating the native vegetation and digging holes, which caused soil erosion. The exploding rabbit population provided plenti

9、ful food for the cats, meaning that the number of cats also increased. This in turn led to more cats hunting the birds. The end result was that parakeets, once large in number and native to the island, died out in 1891.新课程Para3.What do you think was the cause of the extinction of parakeets in 1891?A

10、. The hunters caught the birds for money B. They couldnt adapt to the environment. C. The invading animals took over the islandD. The number of cats feeding on them increased.新课程4.Even after Macquarie Island became an official nature reserve in the 1970s, the rabbits remained out of control. Experts

11、 felt it necessary to come up with a plan to remove all the rabbits from the island. With this goal in mind,a virus was released onto the island. But although the virus caused the rabbit population to decrease from 130, 000 to around 10, 000, it also meant less food for the cats. The cats in consequ

12、ence turned their attention and their stomachsback to the native birds, killing up to 60, 000 each year. In the 1980s, traps and dogs were used to catch the cats. The last Macquarie Island cat was caught in 2000.新课程Para4: Experts felt it necessary to come up with a plan to remove all the rabbits fro

13、m the island. Please list some methods during the 1970s and 1980s.70s80smethod: a virus was released.result: the rabbit population decreased cats turned attention back to the birdsmethod: traps and dogs were usedresult:the last cat was caught in 2000新课程trap n 夹子，陷阱，全套，困境eg:She set a trap for him and

14、 he walked straight into it . 她给他设下圈套，他就径直钻了进去。trap v (trapped trapped) 设陷阱捕捉;困住；使陷入困境 be trapped in 被困在.中；陷入.中trap sb into doing sth 诱使某人做某事eg:They were trapped in the mountain,waiting to be rescued. 他们被困在山中，等待被救援。新课程Experts felt it necessary to come up with a plan to remove all the rabbits from th

15、e island.it:形式宾语to come up with a plan:不定式做真正的宾语.to remove all the rabbits from the island:不定式做后置定语，修饰a plan.翻译：专家认为，必须想办法清除岛上所有的兔子。新课程5.But as the saying goes, While the cats away, the mice will play.With the departure of the cats from the island, the mouse and rat population started to increase. A

16、nd remember those 10, 000 or so rabbits? It turned out that they developed an immunity to the virus, and their numbers exploded once again. Then, in 2006, the rabbits digging caused some land to collapse, and killed a substantial number of penguins. This incident made it clear that the rat, mouse an

17、d rabbit problem needed solving once and for all.新课程Para5.What does the word “their” ( their numbers exploded )in the 5th paragraph refer to?A. Cats. B. Parakeets. C. Rabbits.D. Dogs. .新课程6.So, I am here on Macquarie Island to participate in the programme to tackle this very problem. The first step

18、involved poison being dropped from helicopters. The next step is to remove the last remaining invading species, and thats where I come in-with my dogs. They have been trained to find every last one, without harming the native animals. This intervention is a long, much-delayed ending to a sad story,

19、but we humans owe it to the island to give it a happy ending.新课程Para6:What measures did the author take to solve the problem ?3 steps:dropped poisondogsrecovery新课程to remove. :不定式短语做表语。 and : 并列连词where I come.:where引导表语从句.翻译：下一步是清楚最后残存的入侵物，这就是我的工作了和我的狗一起The next step is to remove the last remaining i

20、nvading species, and thats where I come in -with my dogs.新课程 What can be inferred from the text?A. The authors dogs killed the last invading species on the island.B. The previous methods before 2006 all brought some bad effects.C. Its humansresponsibility to bring everything back to normal.D. The ch

21、aos caused on Macquarie Island by humans has recovered.新课程DiscussionHow could similar situations be avoided in the future?Reference solutions:To avoid similar situation in the future,we should protect the natural ecosystem and be aware of the potential impact that human activities can have ecosystem

22、s.新课程 Macquarie Island is a UNESCO World Heritage Site. But when humans(arrive) on the island in 1810, a tragic story began. They took rats and mice with them accident and these small animals quickly took over the island, eating the birds eggs and (attack) baby birds. To control the mice and rats, c

23、ats(bring) the island, but they developed an appetite for the birds, too. Meanwhile, (rabbit) were introduced to the island as a source of food to feed humans. However, rabbits multiplied and caused soil erosion, and the number of cats ate rabbits and birds increased too. To remove all the rabbits f

24、rom the island, a virus was released onto the island, but the decline of more the rabbits caused cats (eat) more native birds. In the 1980s, traps and dogs were used to catch the cats, which caused the number of mice and rats to increase again. Meanwhile, the remaining rabbits (develop) an immunity to the virus, and their numbers exploded once again. was clear that the rat, mouse and rabbit problem needed (solve) once and for all. So I am here to participate in the programme to tackle this problem. But this intervention is along, much-delayed ending to a sad story