Unit 1

Mr Jackson:Can anyone tell me what you can see in the first photo?　

Betty:There’s a factory, and it’s causing a lot of pollution.

Mr Jackson:Correct.So what can we do about it?

Tony:Well, there should be some rules to stop the pollution.

Mr Jackson:What about the second photo?

Daming:It’s a recycling centre.Waste products such as glass and paper can be recycled there.

Mr Jackson:Good.Why do we need to do that?

Lingling:To save energy,I guess.

Mr Jackson:Great!