英语听力教程3答案与听力材料 呵呵.考试一路顺风.UNIT 1Part I Getting readyA.B. Keys: 1: burning of the forests/tree removal (deforestation)/reduction of the worlds rain forests 2: global warming/greenhouse effect/emissions of CO2Part II The Earth at risk (I)A. Keys:1. a. More people-?more firewood-?fewer treesb. More domestic animals-?more plants-?fewer available plants a, b-? More desert-?move south-?desrtt expanding south-?no grass2. Growing crops stabilize soil, without them the top soil just blows away. But if there isnt enough rain the crops dont 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 Desert 2: North America & most of Europe 3: top soil blowing away 4: tropical forests destruction 5: animal/plant species becoming extinct 6: climate change for the whole worldPart 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 Bangladesh 2: Action to be taken 3: population controlPart IV More about the topic: The Effects of Global WarmingKeys: 1: Warming up of the world 2: Effects of global 3: reduced potential for food production 4: change of patterns of hear-related food poisoning, etc.Part V Do you know?A. Keys: 1: F 2: F 3: F 4: F 5: TB. Keys:Dos 1: your towels 2: Cut out 3: a wall-fire 4: fridge 5: wait until youve a full load 6: a complete meal Donts 7: iron everything 8: the iron up 9: the kettle 10: to the brim 11: hot foodUnit 2Part I Getting readyA.B. Keys: 1: International Union for the Conservation of Nature, United Nations, wildlife, policies 2: Convention on International Trade in Endangered Species, trade, animals and plants, 1975, prohibits, 8000, controls, 30000 3: United Nations Environmental Program, leadership, environment, quality of life 4: World Wide Fund for Nature(formerly World Wildlife Fund) , 1961, Sahara Desert, North America & most of Europe, top soil blowing awayC. Keys: 1: 2 2: 4 3: 5 4: 1,6 5: 3Questions: 1: They work to conserve natural areas that contain endangered wildlife 2: They are campaigning to provide sea sanctuaries for some of these endangered species.Protected-nesting sites for turtles have been set up 3: It refers to the places of safety in the sea where sea animals are protected and allowed to live freelyPart II Christmas bird countsA. Keys: 1: Jan. 3rd 2: more than 40 000 volunteers 3: 1 600 4: a 15 mile diameter 5: an American artist 6: their natural habitats 7: the late 1800sB. Keys: 1: start 2: sponsored 3: outside counting birds 4: experienced bird watchers 5: anyone that is interested or concerned 6: scheduled 7: 10 people taking part 8: 15 mile diameter circle 9: the total bird populations 10: the number of birds 11: the longest-running bird census 12: undefinedPart III Dolphin captivityA.B. Keys: 1: 1 2: 3 3: 4 4: 5 5: 2 6: Dolphins should be kept in captivity. 7: There are educational benefits of keeping marine mammals in captivity.C. Keys: 1: stress (family-oriented) 2: sonar bouncing off 3: average age of death; life getting better for captive dolphins 4: natural behabior patterns-altered 5: suffering from fractured skulls, ribs or jaws 6: cant learn from animals in the wild how they operate, breed, what they need, etc.Part IV More about the topic: Birds-A Source of WealthKeys: 1： 9300 2： Habitat 3： warmer climates 4： 300 different species 5： colder climates 6： habitat alteration 7： esthetic value 8： Birds populationPart V Do you know?Keys: 1: one and one-half million 2: 20 times 3: 100 4: 40000 5: 65 million 6: 3500 7: 2 million square miles 8: 3% 9: 200 animal species 10: 1000 11: a third 12: two-thirds 13: three-quartersUnit 3Unit 3 El Nino? La Nina?Part ID. warmer/ green house effect / sea levels/ climate zonesAs 1998 ends and people look forward to the last year of the century, the World Almanac spoke with experts about what comes next. Almanac editorial director says the experts believe the next century will bring lots of changes. Warm, of course, that our climate is going to continue getting warmer. Thats the subject, by the way, of another new article on the 1999 World Almanac. The greenhouse effect, exactly what causes it, and what steps to be taken to, perhaps to alleviate global warmings. Ive seen recently that 1998 is going to go down as t