(
课件网) Unit 5 Understanding ideas A delicate world 1 What animals can you see in the picture P66 2 What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this birds penguins They would hurt the birds and eat the native vegetation, thus upsetting the local ecological balance. The picture is taken in Macquarie Island(麦夸里岛). Have you ever heard of the island How much do you know about it Look at the picture below and answer the questions. ◆ It lies in the South-west Pacific Ocean. ◆ Politically, it is part of Tasmania(塔斯马尼亚岛), Australia since 1900. ◆ It became a Tasmanian State Reserve(塔斯马尼亚洲自然保护区) in 1978, and a World Heritage Site in 1997. Look at the title of the passage and predict what happened to Macquarie Island. Now let’s read the passage and check your prediction. Possible answer: 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 addition, 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 island's ecology is on the road to recovery with human efforts. Read the passage and find out what happened to Macquarie Island. P67 2 1. Why did the author come to Macquarie Island 2. How did rats and mice come to Macquarie Island 3. What did experts use to remove the rabbits from Macquarie Island To participate in a programme to tackle the problem. Read the passage again and answer the questions. They were brought there along with the ships unknowingly when the humans arrived on the island. A virus. P68 1. To analyse how Macquarie Island was saved from destruction. 2. To inform readers of the chaos caused on Macquarie Island by humans. 3. To entertain reader with a funny story about what happened on Macquarie Island. 4. To suggest ways in which an ecosystem can be protected. Choose the author's purpose in writing this passage and give your reasons. P69 they took over the island, eating the birds’eggs and attacking baby birds. Cats were brought to the island. The cats developed an appetite for the birds. Rabbits were introduced to the island. To provide food for humans. Rabbits multiplied and caused soil erosion, and 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. A virus was released on the island. To remove all the rabbits from the island. Substantial reduction of rabbit population led to cats killing more native birds. 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 once again. Poison and dogs we ... ...
