高中英语外研版（2019）选择性必修第二册Unit 5 A delicate World Starting out 课件（共11张PPT）.pptx

A delicate worldThe environment where different types of plants,animals and species liveDifferent kinds of animals and plants in a balanced environmentEcosystemBiodiversityMatch the definitions（定义）（定义）with the terms (术语术语)生态系统生态系统生物多样性生物多样性The _(more/less)different kinds of living things in the _,the more successful it is.moreecosystemBiodiversityEcosystemNon-living thingsLiving thingsBiodiversity determine influenceComplete the mindmapAll the living things on the Earth live in _ What are they on Earth?ecosystemsWe can think of an ecosystem as this wooden puzzle gameEcosystems are a little bit like this game of sticks(游戏棒游戏棒)Which figure of speech(修辞手法修辞手法)is used here?类比类比We can think of an ecosystem as this wooden puzzle gameEcosystems are a little bit like this game of sticks(游戏棒游戏棒)What does the writer suggest?The things that live in ecosystems _ each other.They are _depend onconnected The whole thing represents an _The woods stand for _ including _who fit all together and _ each other to live.If a species go _,it you disappear from the ecosystem.Losing few of them _cause too much trouble.ecosystemspecieshumansdepend onextinctwill not But losing too many will make the _rickety(摇晃的摇晃的).).Humans have to manage the ecosystem extremely _.If not,it will _and there wont be any place for human beingsecosystemcarefullyfallSatellite Images of Aral Sea,Central Asia What is happening to the area according to the satellite images?Aral Sea is becoming _ and _smallersmallerSatellite Images of Aral Sea,Central Asia 2.What do you think a later satellite image would show?3.What do you think caused these changes?Global Warmingair pollutiondeforestationdesertification