视听阅读第二册UnitPolarBearsinTrouble实用教案

1、Polar bears are built for Arctic.Because polar bears have many body characteristics adapted for polar environment. 第1页/共28页第一页，共28页。Background Info Polar Bear white Arctic regions on drifting oceanic ice floes swift, wide-range traveler, good swimmer food:seal,fish,seaweed,grass,birds,caribou,etc. (

2、omnivorous animal 杂食(z sh) maritime bear第2页/共28页第二页，共28页。第3页/共28页第三页，共28页。4Polar bears can be regarded as “umbrella species” which are at the top of the food chain.Polar bear sealfishwhale seabirdplant第4页/共28页第四页，共28页。第5页/共28页第五页，共28页。Physical characterThe polar bears claws are short and stocky .the

3、 teeth are larger and sharperPolar bear fur consists of dense under fur and guard hairs.nose第6页/共28页第六页，共28页。第7页/共28页第七页，共28页。Hudson Bay 2nd largest bounded by with Canadian bordering states connect Atlantic第8页/共28页第八页，共28页。the Arctic a polar region located at the northernmost part of the Earth. con

4、sists of the Arctic Ocean and parts of Alaska (United States), Canada, Finland, Greenland (Denmark), Iceland, Norway, Russia, and Sweden. consists of a vast ocean with a seasonally varying ice cover, surrounded by treeless permafrost The area can be defined as north of the Arctic Circle it can be de

5、fined as the region where the average temperature for the warmest month (July) is below 10 C (50 F); the northernmost tree line roughly follows the isotherm等温线 at the boundary of this region.第9页/共28页第九页，共28页。Location of the Arctic第10页/共28页第十页，共28页。Artificially coloured topographical map of the Arcti

6、c region第11页/共28页第十一页，共28页。Map from the U.S. Geological Survey shows projected changes in polar bear habitat from 2001 to 2010 and 2041 to 2050. Red areas indicate loss of optimal polar bear habitat; blue areas indicate gain.第12页/共28页第十二页，共28页。 Because polar bears play an important role in Arctic en

7、vironment, scientists feel that polar bear can be a good indicator of the health of Arctic environment. So, we can say that by protecting polar bears, we are protecting the whole Arctic ecosystem. 第13页/共28页第十三页，共28页。Global warming has an impact on the ice. The ice is melting quickly in north and sou

8、th pole. And that have a bad influence on polar bears. 第14页/共28页第十四页，共28页。The polar bear is becoming brown bear.第15页/共28页第十五页，共28页。 Polar bears are in danger, we must take measures to protect the kind of beautiful and lovely animal. Because it is the treasure of nature.第16页/共28页第十六页，共28页。 the situat

9、ion is threatening the survival of the species, and is considered a troublesome indicator of the impact of global warming on the whole Arctic region.第17页/共28页第十七页，共28页。Warm up I. 1.fur 2. carnivore 3. blubber 4. Arctic 5. marine mammal第18页/共28页第十八页，共28页。 II. FBCGDAE第19页/共28页第十九页，共28页。Part 1 I.FTTTF

10、II. Edge inhospitable thrive mammal survival frozen adjustments insulated reserves第20页/共28页第二十页，共28页。 III. 1. One animal actually thrives in these freezing, lonely surroundings. 2. These marine mammals spend most of their lives on frozen seas. 3. Polar bears dont enjoy the luxury of an uninterrupted

11、 winter. 4. Unlike the high Arctic, theres no permanent ice pack here. 5. When the Bay melts, the bears are forced to shore. 第21页/共28页第二十一页，共28页。Part 2. I. When the weather starts to turn cold, large numbers of them gather around the coast. At this time, people can observe them at close range. 2. Th

12、ey 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 animal hunts them, and they are at the top of the food chain.第22页/共28页第二十二页，共28页。 II. 1. private

13、 2. company 3. adult 4. considered 5. conservation第23页/共28页第二十三页，共28页。Part 3 I. CDBEA II. parallels concerned stable patterns critical existence conducted advancement stability length impact第24页/共28页第二十四页，共28页。Part 4 I. ACDBE II. (1)endangered animals (2)a(n) caring world (3)a(n) key to understandin

14、g the Arctic (4)ensure their survival (5)conservation efforts (6)umbrella species (7)the polar bears future lies in the answers to these questions第25页/共28页第二十五页，共28页。Reading： ADCDDAB top killers/an umbrella species The stability or the length of the time The same environment(as polar bears)第26页/共28页

15、第二十六页，共28页。Home listening: I: 0.6, 0.8/ 1.4, 5.8 / 100 / 1,473/ 2008 II: 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. 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”.