八下《Chapter 2 Pollution Fighters》PPT牛津上海版课件.ppt

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 _b_e_a_u_ti_f_u_l . 2 Trees make streets less _n_o_i_sy_. 3 Trees make our air _p_u_r_e_r . 4 Trees make our air c_o_o_l_e_r. 5 Trees make o_x_y_g_e_n to keep us alive and _h_e_a_lt_h_y_. 6 Trees provide us with _u_se_f_u_l things like _f_r_u_it_ and _p_a_p_e_r. 7 Trees help us to fight _p_o_ll_u_ti_o_n_. 8 Trees are in _d_an_g_e_r.
Near my home, there is a _______. Some workers finished it 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 the area was finished. Now it looks_____.
Think over how many kinds of pollutions we have learned before and what they are. After class, try to find the pollution fighters of them and write a composition about them.
Do you know the meaning?
1. sip 2. nature 3. oxygen 4. hectares 5. warn 6. a chemical 7. nasty
a. made by nature, not by man b. unpleasant c. drink in small amounts d. a life-giving gas found in air e. something produced by chemistry f. areas of 10000 square meters g. gay that something bad or
6. And can they really protect themselves from insects? Yes. They can produce a chemical that makes their leaves taste nasty.
7. Can trees help one another? Yes. For example. They can join their roots together underground and pass food and water around.
We get __fr_u_i_ts_from trees.
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
dangerous or may happens
Trees:
1. live much longer than people; T 2. produce rubber, wood, paper, nuts, beans and fruit; T 3. rtealekaese oxygen from the air; F 4. hceoaotl the air; F 5. are like air conditioners; T 6. ccaannnot protect themselves against insects; F 7. ca; T 8. are in danger, mainly from ipnesoepclet/sh;umans F
What are they doing now?
They are having a rest under the trees.
They are planting trees.
They are picking apples from the apple trees.
They are cutting trees.
2. pure a. not mixed with other things b. not c. comfortable 4. running a. traveling b. working c. playing 6. hardly any a. quite a lot b. almost none c. a large number
shopping. A: Anything else? B: Stop 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 …..
Answer the questions
1. We get some useful things from trees, don’t 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.
Everyone in our group agrees/Most people in our group agree to this arrangement.
Write a short article about building a new sitting-out area near your home for your school newspaper.
Make a dialogue according to the model:
Model:
A: What can we do to fight pollution? B: Always put litter in litter bins, and stop using plastic bags for
3. I’ve heard that one tree has the power of 15 air conditioners. Is that right? No. One trees has the power of five air conditioners.
4. Scientists know a lot about trees, don’t they?
Writing:
Our group thinks that the most important way to fight pollution is to _____. The second is to _____. The third is to _____. The fourth is to _____. The fifth is to _____.
No. they are only now beginning to understand them.
Answer the questions
5. Can trees really communicate with one another? Yes. For example, if insects attack a tree, it can warm its neighbors.
Pollution Fighters
Look and Think
What good are trees?
We get shade from trees.
We get_b_e_t_te_r_c_i_ti_e_sfrom trees.
We get _w_o_o_d_e_n__h_o_u_s_es_from trees.
8. Is it true that, every year, there are fewer and fewer trees in the world? Yes. The reason is that people cut down millions of trees, but replace hardly any of them.
• 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 in b. take away c. let out 5. communicating with a. attacking b. sending message/ signals to c. joining
We get __f_u_r_n_it_u_re__from trees.
We get _p_a_p_er_from trees.
We get _p_e_n_c_il_s_from trees.
We get _c_o_k_e_from trees.
We get c_o_f_f_ee__b_e_a_n_sfrom trees.