1、Unit2 Warm upI.1. fur2. carnivore3. blubber4. Arctic5. marine mammalII.1. F2. B3. C4. G5. D6. A7. EPart 1I.FTTTFII.(1) edge(2) inhospitable(3) thrive(4) mammal(5) survival(6) frozen(7) adjustments(8) insulated(9) reservesIII.1. One animal actually thrives in these freezing, lonely surroundings.2. Th

2、ese marine mammals spend most of their lives on frozen seas.3. Polar bears dont enjoy the luxury of an uninterrupted winter.4. Unlike the high Arctic, theres no permanent ice pack here.5. When the Bay melts, the bears are forced to shore. Part 2.I.1. When the weather starts to turn cold, large numbe

3、rs of them gather around the coast. At this time, people can observe them at close range.2. They are eagerly waiting for the Bay to freeze so that they can go back to the frozen ice and their food source.3. People use “tundra buggies”, a specially-designed truck, to see them.4. Because no other anim

4、al hunts them, and they are at the top of the food chain.II.1. private2. company3. adult4. considered5. conservationPart 3I. CDBEAII.(1) parallels(2) concerned(3) stable(4) patterns(5) critical(6) existence(7) conducted(8) advancement(9) stability(10) length(11) impactPart 4I.1. ACD2. BEII.(1)endang

5、ered animals(2)a(n) caring world(3)a(n) key to understanding the Arctic(4)ensure their survival (5)conservation efforts (6)umbrella species(7)the polar bears future lies in the answers to these questionsReading：ADCDDABtop killers/an umbrella speciesThe stability or the length of the timeThe same env

6、ironment(as polar bears)Home listening:I: 0.6, 0.8/ 1.4, 5.8 / 100 / 1,473/ 2008II: 1: Greenhouse gases are produced by car and truck exhaust, factory smoke, and the burning of certain substances for heat and light.2: The effects of global warming will most likely appear in animal populations first.

7、3: Environmental groups, not only governmental ones but also private groups, are working towards this goal.4: The United Nations has organized international gatherings to approach this problem, and has produced a document known as the “Kyoto Protocol”. 5: The serious drawback of the “Kyoto Protocol” is that this document doesnt