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课件网) The natural world Unit 7 Reading Learning Objectives By the end of this lesson, we will be able to： 1. grasp key facts like coverage, ecological roles, and metaphorical descriptions of oceans, wetlands, and forests; 2. enhance English reading skills, including extracting information from text and matching to visual aids; 3. raise environmental awareness and understand the significance of ecosystem protection. Watch and answer How are these ecosystems like human organs Look and say 1 What kind of things do you think are in an ecosystems 2 What do you know about oceans, wetlands and forests An ecosystem includes all the living and non-living things in an area. Ecosystems can be of different sizes, from small ponds to large grasslands. Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment. The ocean is a very large ecosystem on earth. It covers around 71% of the earth’s surface and produces about 70% of the earth’s oxygen. It holds plenty of salt water, and the water rises to the sky, falls onto the lands and then returns to the ocean. This goes on and on, so the ocean is just like the “heart” of the earth. Wetlands only cover about 6% of the earth’s land area. But they are home to about 40% of all the types of plants and animals. Plants in wetlands help get rid of pollution and make the water clean. Wetlands can also help prevent floods. During heavy rains, wetlands store water like huge sponges. They act like the “kidneys” of the earth. Forests make up nearly a third of the earth’s land area. Plants there take in carbon dioxide from the air and produce oxygen.They also trap harmful things in their leaves and help clean the air. Therefore, people often call forests the “lungs” of the earth. Each of these ecosystems supports millions of plants and animals. They keep the planet healthy and make our world a better place. Reading for the structure(结构). What's the structure of the text How many paragraphs（段落） are there C. Ecosystems Sustain Life B. What is an Ecosystem A. Forests: Earth’s Lungs E. Wetlands: Earth’s Kidneys Reading for the key words(关键词). D. The Ocean: Earth’s Heart A. Look at the picture and choose the correct descriptions for each ecosystem according to the article. Write the correct letters in the boxes. a Cover 71% of the earth’s surface b Cover nearly a third of the earth’s land area c Help clean the water d Help make the air clean e Help prevent floods f Produce about 70% of the earth’s oxygen g The “heart” of the earth h The “lungs” of the earth i The “kidneys” of the earth a f g - a: “covers around 71% of the earth’s surface” P2 - f: “produces about 70% of the earth’s oxygen” P2 - g: “the ocean is just like the ‘heart’ of the earth” P2 c e i - c: “Plants in wetlands help get rid of pollution and make the water clean” P3 - e: “wetlands can also help prevent floods ... ...
