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(共27张PPT)
Unit 2 Saving the Earth
Topic 2 All these problems are very serious
Section A
Teaching aims
学习目标：1、熟记新单词，学会运用新短语；
2、学习不定代词和不定副词。
情感目标：了解沙尘暴的形成及其危害，认识树木的重要
性，提高环保意识。
教学重点：初步感知不定代词和不定副词的用法。
教学难点：能够根据图片和信息提示词描述沙尘暴形成的过程。
Puzzle 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
Warming up
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
A Puzzle Game :
提示：横6个，竖4个
wash
forest
protect
earth
water
environment
weather
Watch the video, and answer:
Which disaster can you see in the video
Lead in
Sandstorm. （沙尘暴）
Do you know how sandstorms come into being
sand + storm
→sandstorm
sand
风暴，暴风雨
n.沙
n.沙尘暴
Pre-listening
many trees
cut down
Human beings have cut down many trees.
forests gone
wash the earth away
冲走
The forests have gone and the rain washes the earth away.
change into desert
转换成，变成
沙漠
/ dez (r)t /
sandstorms
As a result, sandstorms come into being.
3.Do you know how sandstorms come into being Number
the pictures and talk about the sandstorm in groups.
( )
( )
( )
( )
( )
( )
4
1
5
3
6
wash the earth away
many trees
change into desert
forests gone
sandstorms come
into being
cut down trees
Do you know what things can stop the sandstorm
Trees.
2
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.
√
While-listening
Task 1
听第一遍时，关注对话的大致意思。
Task 2 Work alone
Listen to 1a again 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.
cut down
As a result
changed
stop
from blowing
stop
from washing
Although
=though
三北防护林工程
Task 3 Watch the video 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
1.While I was walking down the street just now,
I couldn’t see anything.
2.Although we have built “The Green Great Wall”,
we still need to do something to protect the
environment.
Task 4 Read 1a again and find the sentences
the indefinite pronoun and adverb
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
Do you know
1.I have ____ to tell you.
A. important something
B. something important
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
2.Everybody ___ ready for the match.
A. is B. are
不定代词作主语时，谓语动词要用单数。
B
A
Use someone, something, anything, somewhere, anywhere to fill in the blanks.
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 __________.
something
someone
anything
somewhere
anywhere
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
Post-listening
Key sentences and phrases
1. What bad weather! 多么糟糕的天气啊！
2. What causes these sandstorms 是什么引起这些沙尘暴的呢？
3. 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。
4. How can that affect the weather 那是如何影响天气的呢？
5. stop…from doing sth. 阻止……做某事
6. although：尽管，引导让步状语从句
7. do to… 做一些事情去……
something
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
/ri'dju:s/
become weaker
destroy the environment
disappear rapidly
on the earth
enough bamboo to eat
Because of destroying the environment, the animals are dying out. Now let's listen to the passage and circle the phrases you hear. Finish 4A.
4 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 best
in danger of
plenty of
come to understand
fewer and fewer
/k m'pli:tli/
Words and phrases
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
sand
although
change into
人、人类
human being
sandstorm
desert
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...away
wash...away
stop...from doing...
Summary
Homework
2. 复习重点句子和词组以及语法：不定代词和不定副词。。
1. 复习Section A。
3. 完成练习册Section A。
4. 预习Section B。

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