广州牛津初中英语七年级下册课文

1、U2P18JUDY Why are you so interested in trees,Doctor Ray?DR RAY They' re t$e 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 tr

2、ees.Also,do you enjoy fresh air?JUDY Of course.DRRAY 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 don' t know how.JUDY Are trees in danger?DR RAY Yes,they are in great danger.We cut down and b

4、urn millions every year.We are destroying our best pollution fighters.U3U4 ElectricityOne evening,Daisy said, " I' m going to buy some sweets.Does anyone want anything? ” Benny,Daisy ' s brother,said," Yes.Can you get me a packet ofelectricity,please? ”Daisy said, “Right, " an

5、d went out.Benny laughed, “I was finally able to fool Daisy.You can ' t buy electricity in packets like sweets!She' ll look foolish. ”Mum asked , "What is electricity? ”U5U6P82Daisy was in the bathroom.She was brushing her teeth and the tap was on.Water was pouring into the sink.“turn t

6、hat tap off" a voice said loudly.Daisy froze.She looked aroud,but saw no one.“you ' re wasting water " the voice sounded angry.Daisy obeyed.”who who are you? ” Daisy asked."I ' m water .It ' s not easy for meto get here.Twenty-four days ago,I was in a cloud in Yunnan.Then

7、the cloud dropped me into a stream and I flowed quickly down the mountain into the Pearl River.You know the river ,I hope.”“Yes, " Daisy answered.“Well ,the river carried meto a reservoir.I relaxed there for a few days.Then people cleaned me up.”“Cleaned you up? ” Daisy asked.“Yes.I was dirty a

8、fter my journey,so people cleaned me up in a water treatment |works.Then I travelled in the pipes under the streets.I waited there until you called ” me.Daisy said, “ So this is the end of your journey.”“No.Then I ' ll go to a sewage plant.People there will pump me into the river andI will go ba

9、ck into the sea again.”“Again? ”“Yes.I came from it in the first place.Remember not to waste or pollute me.I' mvaluable,like 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 s

10、hook his head. aSometimes you' re really strange,Daisy. " he said.水的经历图"I ' m water .It ' s not easy for meto get here.Twenty-four days ago,I was in a cloudin Yunnan.Then the cloud dropped me into a stream and I flowed quickly down themountain into the Pearl River.You know the

11、river ,I hope.”“Well ,the river carried me to a reservoir.I relaxed there for a few days.Thenpeople cleaned me up. ”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 streets.I waited there until you called ” me.“No.Then I ' ll go to a sewage plant.People there will pump me into the river an