Unit 3 Animals Are Our Friends.Lesson 17 Save the Tigers.教学课件

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Lesson17 Save the Tigers!
Think About It
Where can you usually see a tiger
Do you think tigers need our help Why or why not
Presentation
Learn some new words
fur
They haven't got much fur yet.
dove
The is the symbol of peace.
If you’re ready to face danger or pain, you are brave.
The firemen showed great courage in firefighting. They are brave.
The shark is at the top of the sea food chain.
If the stones are not in balance, they will fall.
The man is cutting a tree.
Be careful. Don’t cut your
fingers.
We can cut the cloth with
scissors.
New words
在……之初
下降到；跌至
食物链
保持平衡
处于危险状态
……的数量
（除某事或某人外）还，也
at the beginning of…,
drop to,
food chain,
in balance,
in danger,
the number of,
as well
Think About It
Where can you usually see a tiger
Do you think tigers need our help
Why or why not
Practice with the new words
century fur symbol brave courage chain
balance reason disappear cut decrease
We paper with scissors.
I’d like to know the why you love your pet dog so much.
The plane flew higher and higher till it in the sky.
The tiger is the symbol of .
The man jumped into the cold river and save the boy.
The number of the tigers in the wild quickly these years.
Alan Turing made the first computer in the last .
The ___ on the bear is dark brown.
The little girl wears a _____ of roses on her hair.
cut
reason
disappeared
brave
decreases
century
courage
fur
chain
Listen and tick the correct answers.
1. “Save the tigers ” is .
a group of volunteers B. a company C. a zoo
2. Tigers are symbols of .
Friendship and peace B. strength and courage
C. danger and balance
3. The number of tigers in the wild is .
A. not changing B. increasing C. decreasing
A
B
C
Read the passage and answer the questions.
How did the number of tigers changing
What is the reason tigers are important to the environment
Why do people hunt and kill tigers
At the beginning of the 20th century, the number of tigers
in the wild was around 100 000. But today that number has
dropped to a few thousand.
The tiger is at the top of the food chain. It helps keep the
number of other wild animals in balance.
Some people hunt and kill tigers for money.
Practice with the new phrases
20th century, Texas red wolves lived in the land comfortably. But later in order to develop agricultural, a lot of American farmers opened up wasteland(荒地).
They large forest . the environment was damaged in a very short time. The habitat(栖息地) of Texas red wolves was smaller and smaller. The ecology(生态) was not . Meanwhile, the development of animal husbandry(畜牧业) makes Texas red wolf became an enemy of the American farmers. The farmers have hunted them a lot. Until in 1970, the last Texas red wolf died in the bay near Texas.
In the world, many species are of disappearing like Texas red wolves.
At the beginning of
in balance
cut down
in danger
as well
as well cut down in danger in balance at the beginning of
Tigers are in danger of going extinct.
“Save the Tigers” is a volunteer group that hopes to stop
the tigers from disappearing.
C. Tigers are important to the environment.
Read the lesson and match each paragraph with its main idea.
A
C
B
Read the lesson again and find some sentences to support the main idea of each paragraph.
Save the Tigers
Paragraph1
Paragraph2
Paragraph3
“Save the Tigers” is a volunteer group that hopes to stop the tigers from disappearing.
“Save the tigers”is a group of volunteers. These volunteers hope to save the tigers of the world. At the beginning of the 20th century, the number of tigers in the wild was around 100 000. But today that number has dropped to a few thousand.
Paragraph1
Tigers are important to the environment.
Tigers live in the forests of Asia. They usually have orange fur and dark stripes. Tigers are symbols of strength and courage. In many stories, they are brave. The tiger is at the top of the food chain. It helps keep the number of other wild animals in balance. For this reason, tigers are important to the environment.
Paragraph2
Tigers are in danger of going extinct.
In recent years, tigers have been in danger of disappearing. Some people hunt and kill tigers for money. People have cut down a lot of trees as well. As forests disappear, tigers lose their homes. The number of tigers in the wild is quickly decreasing and we must do something about it.
Paragraph3
Think about the outcome of the discussions and write it down. You may write about:
What animals do you help
How can you help
Where do you help
How can people join you
Show your composition
At the beginning of the 20th century, the number of tigers in the wild was around 100 000. 在二十世纪初期，野生老虎的数量大约是十万。
the number of是固定短语，意为“……的数量”，后接可数名词复数，谓语动词要用单数。如：
The number of students in our school has grown from 1,000 to more than 1,500.
Language points
【注意】
a number of为量词短语，意为“许多；大量”，相当于a lot of或lots of，中心词是该短语所修饰的可数名词复数，所以作主语时，谓语动词用复数形式。 如：
A number of students like playing computer games.
Fill in the blanks.
1. _____________ students is about twenty. (……的数量)
2. _____________workers in the factory come from the countryside. (许多)
The number of
A number of
2. It helps keep the number of other wild animals in balance. 它可以帮助保持其他野生动物的数量平衡。
balance 在句中用作名词，意为“平衡；均衡”，常用短语be out of balance，意为“不平衡”；keep in balance意为“保持平衡”；balance还作动词，表示“（使）平衡；（使）均衡”。如：
You must learn to keep your balance in skating.
在滑冰时你必须要学会保持平衡。
3. In recent years, tigers have been in danger of disappearing. 近年来，老虎已经面临消失的危险。
danger意为“危险”，通常是不可数名词，表示做某事的危险或发生某情况的危险等，常用短语 be in danger (of)，意为“在危险中”。如：
Is there any danger of fire
有发生火灾的的危险吗？
4. As forests disappear, tigers lose their homes.
随着森林的消失，老虎失去了它们的家园。
as在句中作连词，引导状语从句，意为“随着，当……的时候”。
As the sun rose, the fog disappeared.
As she left the room, she remembered that book.
Fill in the blanks.
1. It’s ____________ your health. (对……是重要的)
2. The river is polluted and ___________ going dry.(处于……危险中)
important to
in danger of
3. ____ time went by, she became more and more beautiful. (随着)
4. _________________ the party, he gave me a gift. (在……之初)
5. The temperature has __________ below zero. (下降到)
6. It is at the bottom of the _________. (食物链)
7. You know, computers bring troubles _______. (也)
As
At the beginning of
dropped to
food chain
as well
Summary:
What did we learn in this lesson
Homework:
Work in groups and discuss some ways we can protect animals. Write down your ideas.