Oxford English 8B Chapter 2 Pollution Fighters. Aims: Make the students understand the text Make the students know the importance of trees.

Oxford English 8B

Chapter 2

Pollution Fighters

Aims:

• Make the students understand the text

• Make the students know the importance of trees.

Three problems

• What good are trees?

• How do trees protect themselves?

• Are trees in danger?

What good are trees?

Compare the two pictures

trees make streets more beautiful and less noisy

bare livelydirtynoisy

ugly

clean

quiet

beautiful

What comes from trees?

nuts for coke rubber

beans for coffee

wood for bench

oranges

wood for pencils

paper for notebooks

Can you find out more useful things come from trees in our daily life?

What good are trees?

take harmful gas from the air and release oxygen into the air

3 trees can do the job of 15 air conditioners running almost all day

Trees cool the air as well as clean it

=

photosynthesis

Advantages1.Make streets more _______ and less _____.

2.are used to make useful things; such as pencil, _____, rubber and paper

3. the fruit, the ____ for the coke, the _____ for the coffee all come from trees

4.Trees are natural _______________:

which let us breathe pure, cool air;

which release oxygen to keep us alive and healthy

beautiful noisy

bench

nuts beans

air conditioners

Self-protect of trees

Oh~~No!Don't touch me!Help!Help!

What will trees do when they are attacked by insects?

Thank you!

Be careful!There are insects!

When trees are attacked by insects......

They can warn their neighbours!

My neighbour just told me that there were some insects attacking him. He warned me to protect myself!

I am producing a chemical. It can make my leaves taste nasty.Hey~~~Don't approach me! Dangerous!

Some trees can join their roots together underground, and pass food and water around. They can communicate with one another.

Trees are in danger!

What is the man doing?

He is cutting a tree.

We cut down millions of trees every year!

Millions of trees are burnt every year. But we replaced hardly any of them!

Rita is asking May questions about trees. May is giving "Yes" or "No" answers and supporting her answers with examples from interview. Read Rita's queations and complete May's answers with one or more words.

RITA: We get some useful things from trees, don't we?

MAY: ____. Two examples are _______________.

RITA: Is it true that trees do two main things to the air?

MAY: ____. They __________________________.

RITA: I've heard that one tree has the power of 15 air conditioners. Is that right?

MAY: ____. One tree has the power of __________________.

RITA: Scientists know a lot about trees, don't they?

MAY: ____. They are ________________________________.

cool it and clean itYes

Yes wood and rubber

five air conditionersNo

only now beginning to understand themNo

RITA: Can trees really communicate with one another?

MAY: ____. For example, if insects

______________________________________________.

RITA: And can they really protect themselves from insects?

MAY: ____. They can produce

______________________________________________.

RITA: Can trees help one another?

MAY: ____. For example, they can

_______________________________________________.

RITA: Is it true that, every year, there are fewer and fewer trees in the world?

MAY: ____. The reason is that people

_______________________________________________.

attack a tree,it can warn its neighborsYes

a chemical that makes their leaves taste nasty

join their roots together underground and pass food and water around.

Yes

Yes

Yescut down millions of trees,but replace hardly any of them

Trees are our best fighters against pollution, but they are in danger now. How can we do to protect them?

Assignment

1.Read the text

2.conclude the outline of the text

3.try to retell the text