pollution fighters课文

Judy is collecting some facts for a class project on pollution She is interviewing Doctor Ray,a scientist ,about trees。JUDY:Why are you so interested in trees,Doctor Ray?DR RAY:They’re the biggest and oldest living things on earth ,Judy。JUDY:Yes ,but what good are trees They make streets more beautiful and less noisy ,but what else can they do DR RAY:Well ,there’s wood in your pencil and the bench ,rubber on the end of your pencil ,and paper in your notebook-all from trees 。And while you're studying at home ,do you like to eat an orange ,or sip a Coke or a coffee JUDY:Sometines 。DR RAY:Well ,the fruit ,the nuts for the Coke ,and the beans for the coffee all come from trees 。And ,I suppose you also enjoy breathing pure ,cool air 。JUDY:Of course 。DR RAY:Then you must thank trees for that ,too 。Trees are natural air ,and release oxygen into the air 。How many people are there in your class ,Judy JUDY:Forty-six 。DR RAY:Well ,one and a half hectares ofs trees could produce enough oxygen to keep your whole class alive and healthy for a year 。JUDY:That's wonderful!DR RAY:Trees cool the air as well as clean it 。Three trees can do the job of 15 air conditioners running almost all day 。JUDY:You certainly know a lot about trees ,Doctor Ray 。DR RAY:Thank you ,Judy ,but I don't ,really 。Scientists are only now beginning to understand them 。For example ,did you know that when insects attack a tree ,it can warn its neighbours The trees can then protect thenmselves by producing a chemical that makes their leaves taste nasty 。And some trees can join their roots together underground ,and pass food and water around 。Trees are communicating with one another ,but we don't know how 。JUDY:Are trees in danger DR RAY:In great danger 。We cut down and burn millions every year but we replace hardly any of them 。We are destroying our best fighters against polluting。