Unit 2 Saving the earth. Topic 2 All these problems are very serious.Section A 课件(共21张PPT)

课件21张PPT。Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section AThere are many kinds of pollution around us, air pollutionlight pollutionlitterwater pollutionsoil pollutionnoise pollutionincluding介词 包括…… sandstorms n. 沙尘暴How does it come into being ? What is the weather like?形成many trees cut down砍伐，砍到forests gone
森林消失wash the earth away
把泥土冲走冲走change into desert转换成，变成沙漠e.g. A lot of rich land has changed into desert because people have cut down too many trees. 3. 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 trees1a Listen read and say The 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.√Listen and answer the questions 1.What’s the weather like today ?
It’s bad. The wind is so strong . And the sand really
hurts face.
2.What causes these sandstorms ?
People have cut down too many trees.
As a result, a lot of rich land has changed into desert.
3.Do we still need to do something to protect the
environment ?
Yes, we do. Although we have built “The Green Great
Wall”, we still need to do something to protect the
environment . 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 1a Listen, read again and complete trees’ functions in 1c . wind; sand; anything
sandstorms ；affect v 影响，
effect n 影响
cut down; as a result; change... into
stop…from…; blow… away ；
can be saved ；wash … away
is harmful to ; although;
do something 知识要点2 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 result4 A. Listen to the passage and circle the phrases you hear. become weaker

destroy the environment
disappear rapidly

on the earth
enough bamboo to eat4 B. Listen again and fill in the blanks.1. Now some kinds of animals are becoming
______ ______ _______.
2. Some animals are_____ ______ ____dying out
completely.
3. In the past, pandas lived a quiet life and had
________ ______food.
4. Humans have _____ _____ __________ the importance of protecting animals.
5. We should ______ ______ ____to protect them.do our bestin danger ofplenty ofcome to understandfewer and fewer somebody, someone, something, somewhere

anybody, anyone, anything, anywhere

none, nobody, nothing, nowhere

everybody, everyone, everything, everywhere
一般情况下用于肯定句一般情况下用于否定句 ，疑问句和条件句。表否定含义可用于各种句式the indefinite pronoun and adverb 不定代词和不定副词eg. I have ____ to tell you.
A. important something
B. something importantB1.形容词修饰不定代词和不定副词时，要放在不定代词/不定副词之后。Do you know?eg. Everybody ___ ready for the match.
A. is B. areA2. 不定代词作主语时，谓语动词要用单数。复合不定代词的用法Lily, would you like ___________ to drink?
Cindy is very busy now. She needs _______ to help her.
Is there _________ wrong with your computer?
Jim looked for his pencil-box ____________ , but he didn’t find it.
I stayed at home last week. I didn’t go __________. Use someone, something, anything, somewhere, anywhere to fill in the blanks.something someone anythingsomewhereanywhere ExercisesWe learn: 1.Some words: sand, although ,sandstorm , affect v 影响，effect n 影响 2.Some phrases: change into, human being cut down; as a result; change... into stop…from…; blow… away be saved ； wash … away 3.Some sentence : (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. Use the indefinite pronoun and adverb. 2.Talk about the sandstorm and its harm.SummaryRead 1a.
Memorize the useful expressions and key sentences which we learn today.
Finish Section A in your workbook.
Preview Section B.HomeworkThank you!