《英语听力教程3》第二版_Unit1_答案

Part I Getting ready

A.

B. Keys:

1: burning of the forests/tree removal (deforestation)/reduction of the world's rain forests

2: global warming/greenhouse effect/emissions of CO2

Part II The Earth at risk (I)

A. Keys:

1.

a. More people--------→more firewood----→fewer trees

b. More domestic animals------→more plants-----→fewer available plants

a, b--→More desert----→move south-----→desrtt expanding south----→no grass

2. Growing crops stabilize soil, without them the top soil just blows away. But if there isn't enough rain the crops don't 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 world

Part 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 control

Part IV More about the topic: The Effects of Global Warming

Keys:

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.

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