Unit 5 Understanding ideasppt课件-（2019）新外研版高中英语选择性必修第二册.pptx

1、滕州二中新校321高效课堂Learning aimsBy the end of this class, we will1. understand Macquarie Island from chaos to conservation.2. learn the ways of understanding a passage.3. establish the awareness that human survival must rely on a good natural ecosystem. 滕州二中新校321高效课堂 1. What animals can you see in Macquar

2、ie Island?2.What would happen if rats, cats and rabbits were introduced to Macquarie Island?While-reading滕州二中新校321高效课堂1.Choose the authors purpose in writing the passage and give your reasons. 1. To analyse how Macquarie Island was saved from destruction.2. To inform readers of the chaos caused on M

3、acquarie 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.滕州二中新校321高效课堂2.Read the text fast and match main ideas with their paragraphsPara 1 A. The terrible ecological disasters Macquarie Isl

4、and went through caused by non-native species in history. Paras 2-5 B. The beautiful landscape Macquarie Island can bring to its visitors.Para 6 C.The efforts the human beings made to restore the ecosystem of Macquarie Island3.Read the passage and find out what happened to Macquarie Island?Human act

5、ion(s)Result(s)Humans arrived on Macquarie Island in 1810Rats and mice were brought there by accident,and .Cats were brought to the island to control the rats and micethey took over the island , eating the birds eggs and attacking baby birds.para.2The cats developed an appetite for the birds.Human a

6、ction(s) Result(s)Rabbits were introduced to the island as a source of food for humansRabbits multiplied and caused soil erosion , and .para.3the 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.Human

7、action(s)Result(s)A virus released onto the island to remove all the rabbits from the island.Traps and dogs were used to catch the cats in 1980s.para.4-5Substantial reduction of rabbit population led to cats killing more native birds.The mouse and rat population started to increase. And the rabbit p

8、opulation exploded once again. Human action(s)Result(s)Poison and dogs were used to remove all the remaining invading species.para.6The island was pest-free and its ecology is on the road to recovery.Think & share1. What is your understanding of “. we humans owe it to the island to give it a happy e

9、nding”?2. How could similar situations be avoided in the future?1. The destruction of the islands ecosystem was caused by animals that humans had accidentally brought with them. Human intervention furture destroyed the islands ecological balance. So humans should make an attempt to restore the islands natural balance.2. 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 ecosystems.