Unit 5 A Delicate World Understanding Ideas 知识点课件-2023-2024学年高中英语外研版（2019）选择性必修第二册

Macquarie Island: from Chaos to Conservation What animals can you see in the picture? What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this? Penguins , elephant seals , wild birds They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance. Macquarie Island from ______(混乱) to ________(保护) 3 Read for structure Part 1 Para_____　　 Part 2 Paras　 　 Part 3 Paras　　 the _________ of the island the_______________ of the island the ________________ of the island 1 beauty 2-3 chaos 4-6 conservation Look through the passage, divide it into three parts, and get the main idea of each part. 1 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 green 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 seals, existed in perfect harmony with their natural habitat for thousands of years. 2 But the island's more recent history tells a different story. It's 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 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. 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 p