Topic 2 All these problems are very serious.Section A课件（22张PPT)

课件22张PPT。Topic2 All these problems are very serious.Unit 2 Saving the EarthPuzzle Game （益智游戏) : (pair work)
Find words as quickly as possible!
两人一组, 找出与环境有关的单词。w a s h j c a k s e w
i a f o r e s t k t e
n f p r o t e c t r a
d f e e a r t h t m t
i e i m e a s e r f h
b c w a t e r u e u e
h t e f g I y l e l r
e n v i r o n m e n t提示：横6个，竖4个w a s h j c a k s e w
i a f o r e s t k t e
n f p r o t e c t r a
d f e e a r t h t m t
i e i m e a s e r f h
b c w a t e r u e u e
h t e f g I y l e l r
e n v i r o n m e n tA Puzzle Game :提示：横6个，竖4个wash
forest
protect
earth
water
environmentweatherLet's watch the video. sand + storm
→sandstormsand风暴，暴风雨n.沙n.沙尘暴 Do you know how sandstorms come into being? Number
the pictures and talk about the sandstorm.( )( )( )( )( )( )wash the earth awaymany treeschange into desertforests gonesandstorms come
into beingcut down trees415362many trees cut down treesforests gonewash the earth away冲走change into desert转换成，变成沙漠/?dez?(r)t /sandstorms come into beingNow, can you tell us how sandstorms come into being?PLEASE HAVE A TRY!many treescut down treesforests gonewash the earth awaychange into desertsand storms come
into beingLong ago, there were …. But people built houses and did other things, so they ....too many ....day by day.And slowly .... disappeared .When it rained heavily, the water....Year after year, the land ....When the wind ...., sandstorms....The boy and girls are
talking about —————.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities Task 1 Work alone
Listen to 1a and choose the best answer.Focus on the main idea of the conversation when you listen for the first time.听第一遍时，关注对话的大致意思。Task 2 Work alone
Listen to 1a and fill in the blanks.People have _________ too many trees. ________
a lot of rich land has ________ into desert.
2) Trees can _______the wind __________ the earth away.
3) They can also _______ the water ______________ the earth away.
4) ______________ we have built the “The Green Great Wall” , we still need to do something to protect the environment.As a resultchangedstopfrom blowingstopfrom washingAlthoughcut down=though三北防护林工程Task 3 Work in groups
Read 1a in groups and answer the following questions.What's the weather like?
2) What causes these sandstorms?
3) How can that affect the weather？
Read 1a and complete trees’ functions. Trees' functions（功能，作用) A.____________________________
B.____________________________
C.____________________________B. A lot of water can be saved by forests.C. They can also stop the water from
washing the earth away. A. Trees can stop the wind from blowing the earth away. K: wind; sand; anything
M: sandstorms
J: cut down; as a result; change into
M: affect
J: stop…from…; blow… away
K: can be saved
J: wash … away
K: is harmful to human beings..., although; do something Act out the dialog in pairs words and phrasesSUM UP沙沙尘暴沙漠虽然，尽管转换成，变成把......吹走把......冲走阻止......做某事sandalthoughchange into人，人类human beingsandstormdesert sentences:(1) As a result, a lot of rich land has changed into desert. (2) Trees can stop the wind from blowing the earth away.blow...awaywash...awaystop...from doing... 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.There are fewer trees left, so the wind always _______
the earth ________.
3.Air pollution has become a serious problem, so we must
______________ to reduce（减少） it.
4.We should try our best to _________ people ________
cutting down the trees.
5.In the future, human beings can protect the trees well.
_____________, animals will live a happy life in the forest. has changed intoblows away do somethingstopfromAs a resultAssignmentRecite 1a.
Memorize the useful expressions and key sentences which we learn today.
3. Finish Section A in your workbook.Thank you!