英语听力教程3听力原文与答案

文档来源为 :从网络收集整理.word 版本可编辑 .欢迎下载支持 . 1文档收集于互联网，如有不妥请联系删除. 《英语听力教程 3》答案与听力材料UNIT 1 Part I Getting readyA. B. Keys: 1: burning of the forests/tree removal (deforestation)/reduction of the world's rain forests2: global warming/greenhouse effect/emissions of CO2 Part II The Earth at risk (I) A. Keys: 1. a. More people--------more firewood----fewer trees b. More domestic animals------more plants-----fewer available plantsa, b--More desert----move south-----desrtt expanding south----no grass 2. Growing crops stabilize soil, without them the top soil just blows away. But if there isn't enough rain the crops don't grow. 3. People try to grow food to support themselves or to create ranches where cattle can be raised, or to get hardwood for export, or to make way for an iron ore mine B. Keys: 1: Sahara Desert2: North America & most of Europe3: top soil blowing away4: tropical forests destruction5: animal/plant species becoming extinct6: climate change for the whole world Part III The Earth at risk (II) A. Keys: 1: Trees would hold rainfall in their roots. When forests in the higher up-river have been destroyed, all the rain that falls in the monsoon season flows straight into the river and starts the flooding.2: He implies that some national governments just consider the results of their policies in the near future, or just think as far ahead as the next election. B. Keys: 1: flooding in Bangladesh2: Action to be taken3: population control Part IV More about the topic: The Effects of Global Warming Keys: 1: Warming up of the world2: Effects of global3: reduced potential for food production文档来源为 :从网络收集整理.word 版本可编辑 .欢迎下载支持 . 2文档收集于互联网，...