八年级英语下册 Chapter 2 Pollution Fighters课件 牛津上海版
27页1、Chapter Two,Pollution Fighters,Look and Think,What good are trees?,We get shade from trees.,We get_from trees.,better cities,We get _from trees.,wooden houses,We get _from trees.,furniture,We get _from trees.,paper,We get _from trees.,pencils,We get _from trees.,coke,We get _from trees.,coffee beans,We get _from trees.,fruits,What do you know about?,How long do they live?Match the items on theleft with the average ages on the right.a mice i 70 yearsb trees ii 150 yearsc tortoises iii 40 yearsd w
2、hales iv 4000 yearse people v 3 years,What does the word mean?,1 1.supposea. knowb. think it is truec.ask3. releasea. bring inb. take awayc. let out5. communicating witha. attackingb. sending message/ signals toc. joining,2. purenot mixed with other thingsnotcomfortable4. runningtravelingworkingplaying6. hardly anyquite a lotalmost nonea large number,Do you know the meaning?,Find the facts,Trees:1. live much longer than people;2. produce rubber, wood, paper, nuts, beans and fruit;3. take oxygen
3、from the air;4. heat the air;5. are like air conditioners;6. cannot protect themselves against insects;7. can share food and water with one another;8. are in danger, mainly from insects;,T,T,T,T,F,F,F,F,release,cool,can,people/humans,Answer the questions,1. We get some useful things from trees, dont we?,Yes. Two examples are wood and rubber.,2. Is it true that trees do two main things to the air?,Yes. They cool it and clean it.,3. Ive heard that one tree has the power of 15 air conditioners. Is
4、that right?,No. One trees has the power of five air conditioners.,4. Scientists know a lot about trees, dont they?,No. they are only now beginning to understand them.,5. Can trees really communicate with one another?,Yes. For example, if insects attack a tree, it can warm its neighbors.,6. And can they really protect themselves from insects?,Yes. They can produce a chemical that makes their leaves taste nasty.,Answer the questions,7. Can trees help one another?,Yes. For example. They can join th
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