外研版必修3 Module 4 Sandstorms in Asia Introduction and Reading课件（49张ppt）

(共49张PPT)
Module 4
Module 4
Sandstorms in Asia
Introduction
and
Reading
To learn about sandstorms in Asia
To learn what cause the sandstorm
To learn how to prevent the sandstorm
Look at the following pictures. What happened in these pictures Try to describe them.
There is a sandstorm and the sky is yellow. We can hardly see anything.
Sandstorm
The sand almost buries the cars.
It is very frightening.
What is a sandstorm
沙尘暴(sandstorm)是指强风把地面大量沙尘物质吹起并卷入空中，使空气特别混浊、水平能见度小于一百米的严重风沙天气现象。
Sandstorm is very frightening. When the sandstorm comes, the wind blows strongly with lots of sand, so that we can hardly see anything. Why are there many sandstorms every year It’s because people cut down more and more trees and forests have gone. As a result, lots of good land has become deserts.
Look at the picture plete the sentences using the correct form of these words.
There has been a __________. It __________ ________________ for ten hours and was very __________. The wind __________ the sand high around the houses, and some cars were almost completely _________ by the sand.
sandstorm
has been blowing
frightening
was blowing
buried
has lasted /
blow bury frightening last (v.) sandstorm
Check the meaning of these words.
dig earthquake protect
sign the Pacific Ocean
3 Deserts are also created because people cut down trees and dig up grass.
4 Sandstorms from Asia have blown across the Pacific Ocean to America.
5 Sandstorms can’t be prevented.
6 The inland region has more sandstorms than the one near the sea.
1 Sandstorms begin in desert areas.
2 Deserts are created by climate changes.
Work in pairs. Discuss these statements and decide which statement is false.
major sandstorm centers in China
1. What should you do in a sandstorm
to protect yourself
2. Which do you think is more dangerous, an earthquake or a sandstorm Say why.
3. Where in China do sandstorms begin
4. If you are in a desert, what is the first sign of a sandstorm
5. Have you ever been in a sandstorm If yes, describe it to your partner.
We shouldn’t go out.
We have to wear hoods, masks and glasses.
Cars slow down and have to turn on headlight.
What should we do in a sandstorm to protect ourselves:
The cause of sandstorm
cutting down too many trees;
desertification (沙漠化);
high temperature and little rain;
serious air and water pollution;
the growing population of the world;
improper (不合适的) use of land;
rapid spread of urbanization(都市化).
Match the words with the definitions.
1. to ride a bicycle ________
2. someone who knows a lot about
a particular subject __________
cycle
expert
citizen cycle (v.) expert forecast
dust process situation survive
4. someone who lives in a particular town or country __________
citizen
5. very small bits of dirt or earth, on the ground or in the air ________
dust
3. things that happen one after another, and have a result _________
process
citizen cycle (v.) expert forecast
dust process situation survive
7. to say what will happen __________
8. everything that is happening at a
particular time __________
forecast
situation
6. to continue to live after a difficult or
dangerous situation or event
________
survive
citizen cycle (v.) expert forecast
dust process situation survive
Look at the photo. Answer the questions.
2. What is the cyclist wearing and why
1. What is happening
There is a sandstorm blowing.
They’re wearing hoods, masks and glasses to protect themselves.
3. What do you think happens to traffic in this situation Why
It moves very slowly. Because it is not clear to see everything on the road and people must take great care.
Stay at home.
4. What do you think experts advise people to do in this situation
Read and match the main ideas with each paragraph.
Para.1
Para.2
Para.3
Para.4
Para.5
Para.6
A. the description of sandstorms
B. the influence of sandstorms to Beijing.
C. the measures the government takes to prevent sandstorms
D. Sandstorms have been a major disaster in Asia for centuries.
E. the suggestions the weather experts give to people
F. the cause of the sandstorms in the northwest China.
Para.1
Para.2
Para.3
Para.4
Para.5
Para.6
Finish the information about sandstorms.
Sand-storms
Strong and ______ winds carrying sands
Too ______ for people to see the sun, and strong enough to move sand dunes.
Mainly in Central Asia, North America, Central Africa and _________.
Australia
dry
thick
Find these words in the passage. Choose the correct answer.
1. sand dunes mean _____
(a) plants growing in sand
(b) sand hills
2. affect means _____
(a) to kill
(b) to cause a change
3. You wear a mask over your _____
(a) face (b) body
4. strength is the noun of _____
(a) strong (b) Strange
b
b
a
a
I. Read the passage carefully and fill in the blanks.
Sandstorms in China
Cause Sandstorms begin in desert areas and have 1. _________ as a result of “desertification”, a process that happens when land becomes desert because of climate changes and because people cut down trees and dig up grass.
increased
Sandstorms in China
Sandstorms affecting Beijing ☆The storms sometimes continue all day and traffic moves very slowly because of the 2. __________.
☆Sometimes the winds are so strong that it’s difficult to 3. ________.
thick dust
breathe
Sandstorms in China
Ways to solve the problem ☆A mass 4. __________ has been started to help solve it.
☆The government has already planted 5. ___________________ trees and plans to continue planting for the next five years.
more than 30 billion
campaign
II. Read Sandstorms in Asia again. Complete these sentences.
The winds in a sandstorm can sometimes ______________________________.
2. When Ren Jianbo was living in Inner Mongolia ________________________
___________.
prevent you from seeing the sun
he experienced a terrible sandstorm
3. Sandstorms in China appear to have increased _______________________.
4. Cutting down trees and digging up grass can _______________________________
___________.
because of desertification
cause deserts and sandstorms to increase
5. Traffic moved very slowly because
_____________________.
6. The government is planting trees to
the west of Beijing to ____________
_____________________.
the drivers cannot see
prevent the
desert coming nearer
III. Match the two parts of the sentences.
Sandstorms A. seem to have increased
in recent years.
2. The strong winds B. experienced a terrible
sandstorm.
3. Ren Jianbo C. have been a major
disaster for many
countries.
4. Sandstorms
in China
D. can move sand dunes.
5. Desertification E. can tell people that there
will be a sandstorm in
advance if any.
6. The Chinese F. will continue planting
Central Weather trees for many years.
Station
7. Weather experts G. is a process of land
becoming desert.
8. The government H. advise people not to go
out.
Ⅳ. Choose the best answers.
1. Sandstorms are strong winds carrying ___________ through the air.
A. dirt and mud
B. rain and heat
C. sand and dust
D. cloud and snow
2. What do the experts advise people to do when a sandstorm arrives in the city
A. Don’t go out
B. Don’t wear masks.
C. Don’t go to work as usual.
D. Don’t ride bicycles
3. The factors that cause land to be desert are ______.
A. cutting down trees.
B. digging up grass
C. climate changes
D. all of the above
4. From the last paragraph we know ____.
A. the government won’t plant trees any
more in five years
B. the distance between the desert and the
center of Beijing is only 250 kilometers
C. more than 30 million trees have been
planted in Beijing
D. the government is taking measures to
prevent sandstorms
Ⅴ. Complete these sentences using words from Sandstorms in Asia. The first letter is provided for you.
1. Weather experts have f_______ another big sandstorm in a week’s time.
2. It’s f__________ to be outside in a sandstorm.
orecast
rightening
3. I was in a very big sandstorm some years ago. Luckily, everyone s_______.
4. There’s a lot of d______ on the floor. We need to sweep it away.
5. Desertification is a long p______ that takes many years.
6. Many Beijing c______ cycle to work.
urvived
ust
rocess
itizens
Choose the words from the box and make the summary complete.
Sandstorms are strong 1. ________ winds carrying sand. They mainly occur
in Central Asia, North America, Central Africa and 2. ________. Sandstorms can
be frightening.
dry
Australia
strength, disappear, sky, dust,
mask, Australia, dry
Ren Jianbo from Inner Mongolia thought he would 3. _________ under the sand when he was caught in one as a child. They begin in desert areas, which are increasing in China due to desertification. To fight desertification, the government has been planting trees. Sandstorms have become a problem in Beijing,
disappear
strength, disappear, sky, dust,
mask, Australia, dry
where they turn the 4. ________ orange and cover the city in yellow-brown 5. ________. Although the Chinese Central Weather Station can forecast storms weeks in advance, their 6. ________ can be surprising. When they arrive people are advised either not to go out or wear a 7. ________. Huang Xiaomei who lives in Beijing says it's difficult to breathe then and the dust makes her ill.
sky
dust
strength
mask
strength, disappear, sky, dust,
mask, Australia, dry
What measures should we take to prevent sandstorms
Measures:
1. We should plant more trees and grow
more grass.
2. Control air and water pollution.
3. Build green fences along the desert.
4. Forecast sandstorm’s real time to prevent disaster.
5. All countries should join hands to propose a plan in sandstorms control and prevention.
What should we do to prevent sandstorms
1. Find more information about
sandstorms on the Internet or other
books and write a short passage about
sandstorms.
2. Design a poster that encourages
people to protect the environment.