Unit 2 Saving the earthTopic 2 All these problems are very seriousSection A 课件(共22张PPT)

课件22张PPT。Unit 2 Saving the EarthTopic2 All these problems are very serious.Section ApollutionReviewIn our daily life, we face many enviromental problems. Can you say something about them?There are several chemical factories pouring waste water into the stream. there be , pour…intoReview cut down, millions of, as a result, homeless, in danger People has cut down millions of trees, as a result, many animals are homeless and in danger.Reviewbe harmful to, health Too much noise is harmful to people's health.People who work or live in noise conditions ofen go deaf.noise conditions, go deafReviewEnjoy a short movieQ: What's the weather like?
It's a sandstorm.It's a kind of storm caused by sand.Presentation3 Do you know how sandstorms come into being? Number
the pictures and talk about the sandstorm in groups.( )( )( )( )( )( )415362wash the earth awaymany treeschange into desertforests gonesandstorms come
into beingcut down treesmany trees cut downHow do sandstorms come into being?forests gonewash the earth away冲走change into desert转换成，变成沙漠 A lot of rich land has changed into desert .come into being n. 沙尘暴standstormThe boy and girls are
talking about —————.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities 1b Listen to 1a and choose the best answer.Focus on the main idea of the conversation when you listen for the first time.√1b Listen to 1a again and fill in the blank.bad cut downstopfrombe savedwashingaway1c Read 1a and complete trees’ functions. Trees can stop the wind from blowing the earth away.
A lot of water can be saved by forests.
They can also stop the water from washing the earth away. Tree’s functions language points1. As a result, a lot of rich land has changed into desert.change … into …= turn…into把……变成……eg.我能把冰变成水。I can change/turn ice into water.eg.我不得不等交通灯变绿。I have to wait for the traffic lights change/turn into green.language points2.Trees can stop the water from blowing the earth away.stop … (from) doing sth.
prevent …… (from) doing sth.eg.我们应该阻止人们破坏环境。we should stop people from destorying the environment.blow …awaywash …away吹走冲刷走language points4.Although we have built "The Green Great Wall", we still need to do something to protect the environment.3.A lot of water can be saved by trees.save v. 贮存、保留、
节约、节省
挽救、拯救although 虽然、尽管；相当于though. 引导让步状语从句； 不与but,however 连用。save one's lifesave time/moneysave a seat 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; although; do something Act out the dialog in pairs 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 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 awaydo somethingstopfromAs a resultWe learn: 1.Some words: sand, although 2.Some phrases: change into, human being 3.Some 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. We can: 1. Know about the functions of trees. 2.Talk about the sandstorm and its harm.SummaryAssignmentRead 1a.
Memorize the useful expressions and key sentences which we learn today.
Finish Section A in your workbook.
Preview Section B.Thank you!