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II.Warm-up
A． Watch a video about the sun and the wind and then answer the question.
Which one is stronger, the sun and the win?
B. Compare two pictures and find out the differences between them.
II I. Presentation
Learn 1a
Task 1 work alone
Listen to 1a and get the main idea.
Task 2. Work alone
Listen to 1a again and fill in the blanks.
People have ____ ___too many trees. __ ___ ___,a lot of rich land has_______ ___desert.
2. Trees can ____the wind ____ _____ the earth ____.
3. They can also____the water ____ ______ the earth______.
4. _______we have bulit “The Green Great Wall”, we still need to do something to protect the environment.
Task 3. Work in groups
Read 1a in groups and answer the following questions:
What about our life in the sandstorms?
What causes these sandstorms?
How can that affect the weather?
IV. Practice
Task A: Read the dialog in roles.
Task B:Acodding the last sentence “We still need to do something to protect the environment.”
and go on writing the dialog.
Make the students show their results in pairs.
Watch a video about the nature to call up everyone to protect the nature.
V. Exercise
Complete the sentences with the correct forms of the given phrases in the box.
as a result, change into, do something, stop…from, blow…away
1.People have cut down such a large number of trees that the land _________desert.
2.we should try our best to ________ people ________ cutting down the trees.