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1、U2 P18JUDY： Why are you so interested in trees,Doctor Ray?DR RAY：Theyre the biggest and oldest living things on Earth,Judy.JUDY： But what are they useful for?DR RAY：Many things.For example,the wood in your pencil,the rubber on the end of your pencil,and the paper in your notebook all come from trees
2、.Also,do you enjoy fresh air?JUDY： Of course.DR RAY：Well,trees are natural air conditioners.They cool the air and clean it.Three trees can do the job of 15 air conditioners.JUDY： You know a lot about trees,Doctor.DR RAY：Not really.Scientists are only now beginning to understand them.For example,when
3、 insects attack a tree,it can warn the other trees around it.Some trees can also join their roots together underground,and pass each other food and water.Trees are communicating with one another,but we dont know how.JUDY： Are trees in danger?DR RAY：Yes,they are in great danger.We cut down and burn m
4、illions every year.We are destroying our best pollution fighters.U3U4 ElectricityOne evening,Daisy said,“Im going to buy some sweets.Does anyone want anything?”Benny,Daisys brother,said,“Yes.Can you get me a packet of electricity,please?”Daisy said,“Right ,”and went out.Benny laughed,“I was finally
5、able to fool Daisy.You cant buy electricity in packets like sweets!Shell look foolish.”Mum asked ,“What is electricity?”U5U6 P82Daisy was in the bathroom.She was brushing her teeth and the tap was on.Water was pouring into the sink.“turn that tap off ”a voice said loudly.Daisy froze.She looked aroud
6、,but saw no one.“youre wasting water”the voice sounded angry.Daisy obeyed.“whowho are you?”Daisy asked.“Im water .Its not easy for me to get here.Twenty-four days ago,I was in a cloud in Yunnan.Then the cloud dropped me into a stream and I flowed quickly down the mountain into the Pearl River.You kn
7、ow the river ,I hope.”“Yes,”Daisy answered.“Well ,the river carried me to a reservoir.I relaxed there for a few days.Then people cleaned me up.”“Cleaned you up?”Daisy asked.“Yes.I was dirty after my journey,so people cleaned me up in a water treatment works.Then I travelled in the pipes under the st
8、reets.I waited there until you called me.”Daisy said,“So this is the end of your journey.”“No.Then Ill go to a sewage plant.People there will pump me into the river and I will go back into the sea again.”“Again?”“Yes.I came from it in the first place.Remember not to waste or pollute me.Im valuable,l
9、ike liquid gold.See you.”Daisy came out of the bathroom.Her brother Benny said,“I heard voices in there.Who were you talking to?”“The water,”Daisy said.Benny shook his head.“Sometimes youre really strange,Daisy.”he said. 水的经历图“Im water .Its not easy for me to get here.Twenty-four days ago,I was in a
10、 cloud in Yunnan.Then the cloud dropped me into a stream and I flowed quickly down the mountain into the Pearl River.You know the river ,I hope.” “Well ,the river carried me to a reservoir.I relaxed there for a few days.Then people cleaned me up.” “Yes.I was dirty after my journey,so people cleaned
11、me up in a water treatment works.Then I travelled in the pipes under the streets.I waited there until you called me.” “No.Then Ill go to a sewage plant.People there will pump me into the river and I will go back into the sea again.” “Yes.I came from it in the first place.Remember not to waste or pollute me.Im valuable,like liquid gold.See you.”
