(
课件网) Welcome to the unit Unit 7 The natural world To learn about different ecosystems and fun facts about them. To talk about ecosystems. 01 02 学习目标 To master some new words and phrases. 03 What ecosystems do you know What fun facts about them do you know 新课讲授 Lead in Ecosystems that exist on land(陆地生态系统) Ecosystems that exist in water(水生生态系统) 1.Forest Ecosystem（森林生态系统）： 2.Grassland Ecosystem(草原生态系统)： 3.Desert Ecosystem（沙漠生态系统）： 1.Freshwater Ecosystem(淡水生态系统)： 2.Marine Ecosystem(海洋生态系统)： 1.Forest Ecosystem（森林生态系统）： Ecosystems that exist on land(陆地生态系统) A forest ecosystem is a place with many trees, plants, animals, and non-living things (like soil and water) that live and work together. 2.Grassland Ecosystem（草原生态系统）： A grassland is a big area covered mostly with grass—there are some small trees or bushes, but not many tall trees. It’s a home for many plants and animals that live together. 3.Desert Ecosystem（沙漠生态系统）： Plants save water. Animals stay cool (by hiding or being active at night). They depend on each other, for example, insects eat plants, and lizards eat insects. A desert is a very dry place with little rain. It can be hot (like the Sahara) or cold (like some deserts in Asia). But even here, plants and animals live together! Ecosystems that exist in water(水生生态系统) 1.Freshwater Ecosystem（淡水生态系统）： A freshwater ecosystem is a place with fresh water (not salty, like ocean water) where plants and animals live. It includes lakes, rivers, ponds, and even small streams! 2.Marine(/m ri n/)Ecosystem（海洋生态系统）： A marine ecosystem is the big, salty ocean and all the living things (plants and animals) that live in it. It covers most of our planet—way more than land! Kitty is learning about ecosystems. Read the facts below with her and tick the ones you already know. √ √ Rainforests are home to over half of all the types of animals and plants on earth. Coral reefs look like rocks, but they support a lot of life in just a small area. Grasslands often lie between deserts and forests. The ice is home to animals like polar bears and penguins. 1 2 3 4 1. Do you know whether corals are animals or plants Corals are animals, because they can’t make their own food like plants do through photosynthesis（光合作用）. They have tiny tentacles（触须） to catch food, such as plankton（浮游生物）. Further thinking 2. What other fun facts about ecosystems do you know The tundra(苔原) ecosystem has a very short growing season because it’s so cold. The rooftop garden ecosystem(small gardens on building tops) helps cool the building in summer, and butterflies love to visit the flowers there. The tree hole ecosystem is a tiny home in old trees—rainwater fills the hole, and it becomes a pool for mosquito larvae, while birds sometimes drink from it! Kitty and David are talking about ecosystems. ... ...
