大学英语听力教程第三册答案主编张民伦第二单元.doc

Unit 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