1、All these problems are very serious.Unit2 Topic2Watch a short movie and guess. What kind of weather is it?Sandstormrainstormsnowstorma kind of storm caused by sandDescribe the sandstorms3 Do you know how sandstorms come into being? Number the pictures and talk about the sandstorm in groups.415362was

2、h the earth awaymany treeschange into desertforests gonesandstorms come into beingcut down treesmany trees cut downforests gonewash the earth away沖走沖走change into desertsandstormcome into being Compare the two pictures.The rich land has changed into desert.change into, change intoRetell CompetitionLi

3、st the trees functionslet out oxygen, lungs of the earth, control the climate ,provide homes for animals,give us fruit, medicine, wood, rubber etc. One Jungle, Many Worlds.Skim 1a and find more about Trees functions.Trees can stop the wind from blowing the earth away. A lot of water can be saved by

4、forests. They can also stop the water from washing the earth away. Listen to 1a, and answer the questions.The Green Great Wall.1. What are the boy and girls talking about? 2. What have we done to protect the environment?The reasons for sandstorms. Read aloud and pick up the useful expressions.Useful

5、 Expressionschange intostop fromblow awaywash awayhuman beingas a resultUseful Expressions7. blow strongly8. What bad weather!9. affect the weather10. The Green Great WallBDo you know?A2 Complete the sentences with the correct forms of the given phrases in the box. as a result, change into, do somet

6、hing, stopfrom, blowaway 1.People have cut down such a large number of trees that the land _desert. 2.There are fewer trees left, so the wind always _ the earth _. 3.Air pollution has become a serious problem, so we must _ to reduce it. 4.we should try our best to _ people _ cutting down the trees.

7、5.In the future, human beings can protect the trees well. _, animals will live a happy life in the forest. has changed intoblows awaydo somethingstopfromAs a resultK: wind; sand; anything M: sandstorms J: cut down; as a result; change into M: affect J: stopfrom; blow away K: can be saved J: wash awa

8、y K: is harmful to; although; do something Act out the dialog in pairs 沙塵暴是怎么形成的？How do sandstorms _?2. 他忘了澆花，結(jié)果花都死了。He _ water the flowers. _, they all died.3.雖然沙灘上的太陽很大，但孩子們?nèi)蚤_心地在玩著沙子。_ the sun is shining strongly on the beach, the children are still playing with the _ happily.鏈接中考鏈接中考Summary 1.cha

9、nge into desert 2. human being 3.as a result 4. come into being 5.stop from 6.blow away 7.wash away 8.destroy the environment(1)Trees can stop the wind from blowing the earth away. (2)They can stop the water from washing the earth away. (3)As a result, a lot of rich land has changed into desert.(4)W

10、hile I was walking down the street just now, I couldnt see anything.(5)Although we have built “The Green Great Wall”, we still need to do something to protect the environment. Read 1a. Memorize the useful expressions and key sentences which we learn today. Finish Section A in your workbook. Preview Section B. Trees are very useful to us. They can help us p_ the wind from blowing the earth away and stop the s_ from moving towards the rich land. Trees also s_ water from running away. They can keep a great d_ of water. So we must stop people from c_ down