英语听力教程3第二版unit1答案文档格式.docx

1、 global warming/greenhouse effect/emissions of CO2Part II The Earth at risk （I）A. Keys:a. More people- more firewood- fewer treesb. More domestic animals- more plants- fewer available plants a, b- More desert- move south- desrtt expanding south- nograss2. Growing crops stabilize soil, without them t

2、he 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 Sahara Desert2: North America most of Europe3: top soil

3、blowing away4: tropical forests destruction5: animal/plant species becoming extinct6: climate change for the whole worldPart III The Earth at risk （II） 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 flo

4、ws straight into the river and starts the flooding. 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. flooding in Bangladesh Action to be taken population controlKeys: Warming up of the world Eff

5、ects of global reduced potential for food production change of patterns of hear-related food poisoning, etc.Part V Do you know? F 2: F 3: F 4: F 5: TDos 1: your towels 2: Cut out 3: a wall-fire 4: fridge 5: wait until youve a full load 6: a complete mealDonts 7: iron everything 8: the iron up 9: the

6、 kettle 10: to the brim11: hot foodTape script1.The Amazon forests are disappearing because of increased burning and tree removal. In September, satellite pictures showed more than 20000 fires burning in the Amazon. Experts say most of these fires were set by farmers. The farmers were attempting to

7、clear land to grow crops. The World Wildlife Fund says another serious problem is that too many trees in the Amazon rain forest are being cut down. The World Wildlife Fund says the fires show the need for urgent international action to protect the worlds rain forests. The group warns that without su

8、ch action some forests could be lost forever.2. Environmental issues swell to the full in Berlin this week, for the UN spongsored conference on global warming and climate change is the first such meeting since the Rio summit three years ago. With scientists and governments now generally ready to acc

9、ept that the earth climate is being affected by emissions of CO2 and other greenhouse gases, over a hundred countries are sending delegations. But how much progress has been made implementing the greenhouse gas reduction target agreed on at Rio? Simon Dary reports.B: Thats right. In the USA, as you

10、know, intensive agriculture requires a plentiful supply of rain for these crops to grow, I mean if there isnt grow. And growing crops stabilize soil, without them the top soil just blows away. This is also true for any region that is intensely farmed most of Europe, for example.I: And what did you f

11、ind in South America? In South America （as in Central Africa and Southern Asia） tropical forests are being cut down at an alarming rate. This is done so that people can support themselves by growing food or to create ranches where cattle can be raised to be exported to Europe or America as tinned me

12、at. The problem is that the soil is so poor that only a couple of harvests are possible before this very thin soil becomes exhausted. And it cant be fed with fertilizers like agricultural land in Europe. For example, in Brazil in 1982 an area of jungle the size of Britain and France combined was des

13、troyed to make way for an iron ore mine. Huge numbers of trees are being cut down for exports as hardwood to Japan, Europe, USA to make things like luxury furniture. These forests cant be replaced the forest soil is thin and unproductive and in just a few years, a jungle has become a waste land. Tro

14、pical forests contain rare plants （which we can use for medicines, for example） and animals one animal or plant species becomes extinct every half hour. These forest trees also have worldwide effects. You know, they convert carbon dioxide into oxygen. The consequence of destroying forests is not onl

15、y that the climate of that region changes （because there is less rainfall） but this change affects the whole world. I mean, over half the worlds rain forest has been cut down this century. So, Brian, would you agree that what we generally think of as natural disasters are in fact man-made? Yes, by a

16、nd large. I mean, obviously not hurricanes or earthquakes, but take flooding, for example. Practically every year, the whole of Bangladesh is flooded and this is getting worse. You know, the cause is that forests have been cut down up in Nepal and India, I mean higher up-river in the Himalayas. Tree

17、s would hold rainfall in their roots, but if theyve been cut down all the rain that falls in the monsoon season flows straight into the river Ganges and floods the whole country. The reason for flooding in Sudan is the same the forests higher up the Blue Nile in Ethiopia have been destroyed too. Wel

18、l, this all sounds terribly depressing. Um . What is to be done? I mean, can anything be done, in fact? Yes, of course it can. First, the national governments have to be forward-looking and consider the results of their policies in ten or twenty years, not just think as far ahead as the next electio

19、n. Somehow, all the countries in the world have to work together on an international basis. Secondly, the population has to be controlled in some way: there are too many people trying to live off too little land. Thirdly, we dont need tropical hardwood to make our furniture its a luxury people in th

20、e West must do without. Softwoods are just as good, less expensive and can be produced on environment-friendly tree farms, where trees are replaced at the same rate that they are cut down. And, presumably, education is important as well. People must be educated to realize theconsequences of their ac

21、tions? Yes, of course. Well, thank you, Brian So, Brian, would you agree that what we generally think of as . er. as er . natural disasters are in fact man-made? Yes, by and large . er . I mean, obviously not hurricanes or earthquakes, but take flooding, for example. I mean, practically every year,

22、the whole of Bangladesh is flooded and this is getting worse. You know, the cause is that forests have been cut down up in Nepal and India . I mean . higher up-river in the Himalayas. Trees .er . would hold rainfall in their roots, but if they Well, this all sounds terribly depressing. Um . what is

23、to be done? Yes, of course it can . er . first, the national governments have to be forward-looking and consider the results of their policies in ten or twenty years, not just think as far ahead as the next election. Somehow, all the countries in the world have to work together on an international b

24、asis. Secondly, the population has to be controlled in some way: And, presumably, education is important as well. People must be educated to realize the consequences . um . of their actions? Yes, yes of course. Well, thank you, Brian.The world is warming up. We know this because average temperatures

25、 are the highest since scientists started measuring them 600 years ago. The increase is about 0.2 every year. This may seem very slight, but we know that slight changes in temperature can have a big effect on other things. Most scientists now believe this global warming is due to human activity.Jeff

26、 Jenkins is head of Britains Climate Prediction Center. He explains how global warming can happen.Sunlight strikes the earth and warms it up. At the same time heat leaves the earth, but part of that is trapped by carbon dioxide and other gases in the earths atmosphere. That has been happening ever s

27、ince the earth was formed. But the fear is that increasing amounts of carbon dioxide produced by industrial processes and transport and so on will lead to a greater warming of the earths surface. So thats the global warming that people are concerned about.People are most concerned about the use of f

28、ossil fuels. Fossil fuels are oil, coal, wood and so on. When these burn, they produce the gas carbon dioxide. Many scientists agree that an increase in the amount of carbon dioxide and some of the gases in the atmosphere will increase the amount of warming. Computers are being used to predict what this may mean. They showed that therecould be great changes in rainfall and the rise in the sea level as ice caps in the north and south poles melt