12
Pre-reading Pre-reading 1.Put the following pictures in a right order.
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
A
B
C
D
E
F
2.Anwer the questions with the picture cues.
What must we do first when we plant trees?Dig a hole large enough for the tree.
What do we do with a stick?
Where do we put the tree?
Knock a long strong stick into the earth.
Water the tree.
Tie the tree to the top of the stick.
What is the last thing we must do?
What do we tie the tree to?
What do we do after we put the earth back in the hole?Step on the earth several times after we put the earth back in the hole.
Put the tree in the hole.
dig…
knock…
put…
put…back… step on…
tie…
water…
3.A quiz on trees1. Trees keep the ground stable( 稳固的） .
2. A healthy tree has about 20,000 leaves.
3. Trees help cool the earth down.
4. An oak tree ( 橡树） help over 460 kinds of animals.
5. In a year, an average tree can remove ( 消除） 1 ton of carbon dioxide （二氧化碳） from the air.
6. The average tree in a big city survives ( 存活） only about 80 years.
7. Patients get well faster when they are in a room that looks out onto trees.
8. Nowadays more and more people in Shanghai adopt a tree to welcome Tree Planting Day. It only needs 30 yuan.
Pre-reading Pre-reading
2,000
8
CO2
harmful gas
take inO2releaseoxygen
cool the air and make it clean
fruit
wood nuts
cotton
teabeans
……rubber
Read the passage
While-reading While-reading
Task 1 on Page 28
Read again and divide it into four parts.What Good Are Trees?
March 12 is Tree Planting Day. On that day every year, people, men and women, young and old, plant a lot of trees. What good are trees? They make streets and housing estates more beautiful and quieter. They make the air cleaner and cooler. You probably(可能 ) didn’t know that three trees can do the job of fifteen air conditioners. Trees can also give us fruit. Oranges, bananas, apples, pears and kiwi fruit all come from trees. There is wood in our pencils, and paper in our books --- all from trees. But some people do not know the importance of trees. They cut down trees at will(任意 ). We must stop them doing so. We must plant more and more trees.
What good are trees?
They make streets and housing estates __________ and _______. They make the air ______ and ______.
_____ trees can do the job of ______ air conditioners.
more beautiful quieter
cleaner cooler
Three fifteen
Summarize the main idea of each parts.
Part 1
Part 2
Part 3
Part 4
When is the Day and what do people do?
What good are trees?
What kind of bad things happen to trees?
What should we do then?
1. make streets and housing estates…
2. make the air…(an interesting fact: 3 trees = 15 air conditioner)
3. give us fruits…
4. give us wood and paper…
1. People don’t know…
2. …cut down…at will1. We must stop…
2. We must plant…
What good are trees?
They make streets and housing estates __________ and _______. They make the air ______ and ______.
_____ trees can do the job of ______ air conditioners.
more beautiful quieter
cleaner cooler
Three fifteen
Homework Homework
Writing:
The Earth Day
