牛津上海版英语八下《Chapter 2 Pollution Fighters》课件.ppt

1、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 _fro

2、m trees.,fruits,How long do they live?Match the items on the left with the average ages on the right. a mice i 70 years b trees ii 150 years c tortoises iii 40 years d whales iv 4000 years e people v 3 years,What does the word mean?,1 1.suppose a. know b. think it is true c.ask 3. release a. bring i

3、n b. take away c. let out 5. communicating with a. attacking b. sending message/ signals to c. joining,2. pure not mixed with other things not comfortable 4. running traveling working playing 6. hardly any quite a lot almost none a large number,Do you know the meaning?,Trees: 1. live much longer tha

4、n people; 2. produce rubber, wood, paper, nuts, beans and fruit; 3. take oxygen 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

5、,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 that right?,No.

6、 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 prot

7、ect 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 their roots together under- ground and pass food and water around.,8. Is it true that, every year, there are fewer an

8、d fewer trees in the world?,Yes. The reason is that people cut down millions of trees, but replace hardly any of them.,Listening,Listen and complete the notice below by putting one word in each space. Eight reasons for helping to plant trees: 1 Trees make streets more _. 2 Trees make streets less _.

9、 3 Trees make our air _. 4 Trees make our air _. 5 Trees make _ to keep us alive and _. 6 Trees provide us with _ things like _ and _. 7 Trees help us to fight _. 8 Trees are in _.,beautiful,noisy,purer,cooler,oxygen,healthy,useful,fruit,paper,pollution,danger,What are they doing now?,They are havin

10、g a rest under the trees.,They are planting trees.,They are picking apples from the apple trees.,They are cutting trees.,Make a dialogue according to the model:,A: What can we do to fight pollution? B: Always put litter in litter bins, and stop using plastic bags for shopping. A: Anything else? B: S

11、top factories from producing unhealthy gases, plant more trees in the streets, and make classrooms less noisy. A: Which ways are more important and which ways are less important? B: I think that .,Model:,Our group thinks that the most important way to fight pollution is to _. The second is to _. The

12、 third is to _. The fourth is to _. The fifth is to _. Everyone in our group agrees/Most people in our group agree to this arrangement.,Writing:,Write a short article about building a new sitting-out area near your home for your school newspaper.,Near my home, there is a _. Some workers finished it

13、last week. I watched them from my flat. First, _(workers/arrive/lorry). On the back of the lorry there _(be/trees/brushes). The workers _(dig/holes/ground). Second, they _(plant/trees/holes). Next, they brought some large containers. They _(put/earth/containers). Then they _ ( plant / brushes / containers ). Next, they _(pick up/all rubbish) and _(sweep/area/neatly). After that, they _(water/plants/hose). Then t