Unit 5 A delicate world Understanding ideas 课件-2022-2023学年高中外研版（2019）选择性必修第二册

SB2U5 A Delicate World (Understanding ideas) Lead in Activity 1 Watch the video and answer the questions. Are humans part of Earth’s ecosystems? Why? In what ways can humans affect ecosystems? Are humans part of Earth’s ecosystems? Why? In what ways can humans affect ecosystems? Yes, because all living things live in ecosystems and humans are living things. Humans affect ecosystems in positive and negative ways. On one hand, they plant trees, raise, protect animals, and recycle things, but on the other, deforestation, air and water pollution and excessive waste from humans harm ecosystems. 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? Birds and penguin. Lead in Activity 2 They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance. Pre-reading Look at the title and predict the main idea of the passage. MACQUARIE ISLAND: from Chaos to Conservation [mə'kwɔri] /'keɪɒs/ n.混乱；紊乱 a state of complete confusion and lack of order /kɒnsə'veɪʃn/ n. the protection of the natural environment （对自然环境的）保护 While-reading Look through the passage, divide it into three parts, and get the main idea of each part. Read for structure Part 1 Para_____　　 Part 2 Paras_____ Part 3 Paras_____ An introduction to the island 1 2-3 4-6 How would you describe the current Macquarie Island? the_______________ of the island the ________________ of the island chaos conservation “a wild and natural beauty” “surprising (UNESCO World Heritage Site)” “harmony” What happened to the island? the beauty of the island long and thin shape green grass and bare rocks _________________ _________________ __________________ wild natural harmonious In what ways can we find Macquarie island is beautiful? World Heritage Site beauty Part 1 (para.1) native inhabitants natural habitat While-reading Read details Organise information from the passage and comple