step by step 2 3000 第8单元答案.doc

Unit 8 Part I A: 1.Greenpeace/attitudes and behavior/environment/peace 2.World Wildlife Foundation/1961/a future/nature 3.Live Earth/climate crisis 4.Green School Project/schools/waste/landfill 5.Climate Change/knowledge/measures 6.Friends of the Earth/network/activist groups/urgent 7.Environmental Bureau/143/31/sustainable 8.Foundation/oceans,waves and beaches/50,000 9.Green Building Council/designed,built and operated/responsible,heslthy 10.the Alliance to Save Energy/costs/greenhouse gas emissions 11.The Earth Organization/conservation/rehabilitation/plant and animal 12.Trees, Water People/natural resources/well-being 13.American Forests/restore and enhance/filter/remove/homes 14.The Global Amphibian Assessment/status/5,918/600/60 15.Solar Energy Society/technologies B: 1.food/doesnt/packaging 2.vegetables/dont/chemicals 3.Save/water 4.wont/forever/earth or sea 5.bottles/once/bank 6.paper/recycled 7.Aviod 8.unleaded petrol 9.made from/protected 10.public transportation 11.wood/rainforests 12.aerosols/havent 13.Dont/plastic boxes 14.batteries/little/50/energy 15.lights/using 16.conversation/danger 17.25%/rubbish 18.old people/homes/energy 19.Visit/zoos Part II A: 1.the atmosphere/the climate/irreversible 2.everybodys life/activities/everyday people/do a lot 3.one step/conscious about/energy/fuel efficient/light bulbs/recycling B: 1.planting single tree 2.deflate Greenhouse Effect/take CO2 3.real simple activities/accessible to people/citizens/do a lot 4.clean up CO2/improve environment/neighborhoods attractive 5.a variety of personal actions Part III I headache Not easily break down II.PBS A:contact/microorganisms/enzymes/smaller pieces/into water CO2 B: 1.safer 90%/degraded/in 90 days/shorter/in a dump 2.more heat resistant a.melt at 60 centigrade(Celsius) b.shape retained up to 100 centigrade C:disadvantage More expensive than ordinary plastic/price 20% higher III Application A:already started B:To be popularized C:role Plastic food containerstableware/road