Unit 2 Topic 2 Section A课件+内嵌音视频（仁爱科普版九年级上册）

(共23张PPT)
Unit 2 Saving the Earth
Topic 2 All these problems are very serious.
Section A
Learn some new words and phrases.
Words: although, sandstorm, desert, reduce, completely
Phrases: change into, human being
Be able to use some useful expressions.
As a result, a lot of rich land changed into desert.
Trees can stop the wind from blowing the earth away.
Use the indefinite pronoun and adverb.
It’s a kind of storm caused by sand.
rainstorm
What kind of weather is it
sandstorm
snowstorm
1a Listen, look and say.
M: wind
K: sandstorms; anything
M: bad
J: cut down; as a result; change into; blow… away
K: can be saved
J: wash … away
M: affect
K: is harmful to; although
Act out the dialog in pairs
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.
B
Focus on the main idea of the conversation when you listen for the first time.
Listen again 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.
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和疑问句
表否定含义
可用于各种句式
the indefinite pronoun and adverb
1.I have ____ to tell you.
A. important something
B. something important
B
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
2.Everybody ___ ready for the match.
A. is B. are
A
不定代词作主语时，谓语动词要用单数。
1. As a result, a lot of rich land changed into desert.
结果，大量肥沃的土地变成了荒漠。
change…into译为________,
同义短语：_________.
加热使水变成蒸汽。
Heat ______water _______ steam.
= Heat ______water _______ steam.
我们必须等到交通灯变绿。
We have to wait for the traffic lights to______ ______ green
把...改变成...
turn...into...
changes into
turns into
turn into
2. Trees can stop the wind from blowing the earth away.
树可以防风固土。
stop/keep/prevent .... from doing sth.
阻止某人做某事
keep sb. doing sth 让某人一直做某事
1c 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.
树可以防风固土。
森林可以储存大量的水分。
树也能防止水土流失。
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 into
blows
away
do something
stop
from
As a result
3 Do you know how sandstorms come into being Number
the pictures and talk about the sandstorm in groups.
( )
( )
( )
( )
( )
( )
4
1
5
3
6
2
wash the earth away
many trees
change into desert
forests gone
sandstorms come into being
cut down trees
many trees
cut down
Long ago, there were lots of trees and forests. But people needed some wood to build houses and do other things, so they cut down the trees day by day.
forests gone
wash the earth away
Forests have gone.
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.
sandstorms
come into being
4 A. Listen to the passage and circle the phrases you hear.
become weaker
destroy the environment
disappear rapidly
on the earth
enough bamboo to eat
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 best
in danger of
plenty of
come to understand
fewer and fewer
4 B. Listen again and fill in the blanks.
1.Some words: sand, although
2.Some phrases: change into, human being
3.Some sentences:
(1)As a result, a lot of rich land changed
into desert.
(2)Trees can stop the wind from blowing the
earth away.
1. Use the indefinite pronoun and adverb.
2.Talk about the sandstorm and its harm.
We learn:
We can:
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
anything
somewhere
anywhere
1. Memorize the useful expressions and key sentences which we learn today.
2. Preview Unit 2 Topic 2-Section B.