(
课件网) Unit 5 A delicate world Starting out & Understanding ideas BY MICHELLE Starting out Part 01 What is an ecosystem How many ecosystems do you know A wonderful serenity has taken possess A wonderful serenity has taken possess A wonderful serenity has taken possess tundra /'t ndr / 冻原 glassland 温带草原（接近苔原） steppe 温带草原（树少的） taiga /'ta ɡ / 北方针叶林 prairie / pre ri/ 北美草原 intertidal zone / nt 'ta d l/潮间带 savannah /s 'v n / 热带草原 desert / dez t/ 沙漠 subtidal zone /s b'ta dl/ 潮下带 A wonderful serenity has taken possess A wonderful serenity has taken possess A wonderful serenity has taken possess continental shelf 大陆架 tropical rain forests 热带雨林 wetlands 湿地 deep ocean zone 深海区 Artic ice packs 北极浮冰 estuary / estju ri/ 港湾 temperate rain forests 温带雨林 marine mud flat 海洋泥滩 deciduous forests 落叶森林 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 It’s vital for our human beings to take action to protect our Earth. Yes! Humans are part of Earth’s ecosystem. We should be in harmony with our environment. Because all the living things live in ecosystems and people are living things. In what ways can humans affect ecosystems Positive: people can plant trees, feed and protect animals, recycle things and so on. Negative: The air and water pollution and excessive waste. Look at the satellite images. Aral Sea Located in Central Asia, between Kazakhstam to the north and Uzbekistan to the south The fourth largest lake (1960s) Just four smaller lakes (NOW) Watch the change of Aral Sea, answer the questions. What is happening to the area The water area is shrinking. The water area will be smaller. What do you think a later satellite image would show What do you think caused these changes The irrigation project Climate change Vegetation Damage ... Understanding ideas Part 02 Lead in Look at the picture and answer the questions. 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. They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance. Read the passage and find out what happened to Macquarie Island. Pre-reading How much do you know about Macquarie Island Whie-reading Look through the passage with the following questions. Match the paragraph(s) with correct main ideas. Para.1 Para.2-3 Para.4-5 Para.6 Chaos caused by humans. The process of preservation. The introduction of the island. The author’s mission. Choose the author’s 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 Macquarie Island by humans. 3 To entertain readers with a funny story about what happened on Macqua ... ...
