冀教版八年级下册Unit 3 Animals Are Our Friends Lesson 17 Save the Tigers课件(共33张PPT)

(共33张PPT)
Lesson 17: Save the Tigers
Unit 3 Animals Are Our Friends
单词：century, courage, brave, reason, kill, cut, fur, symbol
chain, balance, disappear, decrease
短语：at the beginning of…, drop to, food chain, in balance, in danger
cut down, as well
句子：(1) Tigers are symbol of strength and courage.
(2) It helps keep the number of other wild animals in balance.
(3) For this reason, tigers are important to the environment.
学习并积累一些与老虎、生态环境、环境保护等相关的词汇和表达；能用英语谈论保护老虎的话题。
Learning Goals
1
2
Free Talk
How many types of tigers do you know
Where can you usually see a tiger
Do you think tigers need our help Why or why not
Presentation
“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.
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.
Save the Tigers group works to protect the tigers .
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.
Learning Tip　
There are currently six types of tigers: the Bengal tiger, the Siberian tiger, the Sumatran tiger, the Malayan tiger, the Indochinese tiger and the South China tiger.
New words
century
fur
symbol
courage
brave
chain
n. 世纪
n. (兽类的)毛
n. 标志；象征
n. 勇气；胆量
adj. 勇敢的；无畏的
n. 链子；链条
balance
reason
disappear
kill
cut (cut/cut)
decrease
n. 平衡；平稳
n. 原因；动机；理由
v. 消失；失踪
v. 杀死
v. 砍；切；剪；割
v. 使……变小；减少
at the beginning of
drop to
food chain
in balance
cut down
as well
在……之初
下降到；跌至
食物链
保持平衡
把……砍倒；减少
（除某事或某人外）还；也
Practice
选词填空。
(1) We __________ paper with scissors.
(2) I’d like to know the __________ why you love your pet dog so much.
(3) The plane flew higher and higher till it __________ in the sky.
(4) The tiger is the symbol of __________.
(5) The __________ man jumped into the cold river and save the boy.
century; fur; brave; courage; chain; reason; disappear; cut; decrease
cut
reason
disappeared
courage
brave
Practice
选词填空。
(6) The number of the tigers in the wild quickly __________ these years.
(7) Our life has become better in the 21st __________.
(8) The __________ on the bear is dark brown.
(9) The little girl wears a gold __________ around her wrist（手腕）.
century; fur; brave; courage; chain; reason; disappear; cut; decrease
decreases
century
fur
chain
Let’s do it!
1. Read the lesson and match each paragraph with its main idea.
B
C
A
Reading and Answering
1. How many tigers were there at the beginning of the 20th century
2. Where do tigers live
3. What do tigers symbolize
Around 100 000.
They live in the forests of Asia.
They are symbols of strength and courage.
4. What is the reason tigers are important to the environment
5. Why do people hunt and kill tigers
6. Aside from their being hunted and killed, what is another
reason tigers are disappearing
People have cut down a lot of trees as well. As forests disappear, tigers lose the homes.
They are for money.
Because tigers help keep the number of other wild animals in balance.
Language points
1. “Save the tigers” is a group of volunteers.
save v. 拯救，挽救 常见短语： save one’s life 救某人的命
※ The doctor did what he could to save the boy’s life.
为了救那个男孩的命，那个医生做了他能做的一切。
save...from... 从……救出……
※ The policeman saved him from the big fire.
那个警察把他从那场大火中救了出来。
拓展：
save作动词，还可表示“储蓄；节省；节约”。
※ To save money, he only ate some bread for dinner.
为了省钱，他晚饭只吃了一些面包。
2. At the beginning of the 20th century, the number of tigers in the wild was around 100 000. 在20世纪初，野生老虎的数量大约是10万只。
(1) at the beginning of... 在……之初
其后常接表示时间、事件或其他意义的名词，其反义词组at the end of...意为“在……的结尾/末端”。
※ At the beginning of the class, the teacher gave out some books to us.
开始上课时，老师给我们发了一些书。
※ We shall have an exam at the end of this month.
本月底我们将有一场考试。
(2)辨析: the number of与a number of
① the number of ……的数目/数量；后接可数名词的复数形式，作主语时，谓语动词用单数形式。 The number of the students in our school is about 3 500.
我们学校的学生人数大约是三千五百人。
② a number of 许多，大量；修饰可数名词的复数形式，作主语时，谓语动词用复数形式。 A number of students are playing in the playground.
许多学生正在操场上玩。
※ The number of students in our school is about 2 000.
在我们学校，学生的数量是大约2000人。
※ A number of students like playing basketball after school.
放学后许多学生喜欢打篮球。
3. Tigers are symbols of strength and courage.
symbol n. 标志；象征 常与of搭配，表示“……的标志/象征”。
※ Doves are symbols of peace.
鸽子是和平的象征。
4. It helps keep the number of other wild animals in balance.它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”, 常用短语有：
in balance 保持平衡 be out of balance 不平衡
keep / lose one’s balance 保持/失去平衡
※ The boy keeps the see-saw in balance.
这个男孩让跷跷板保持平衡。
※ You must learn to keep your balance in skating.
在滑冰时你必须学会保持平衡。
※ I lost my balance and fell.
我身体失去平衡，摔了一跤。
5. For this reason, tigers are important to the environment.
reason n. 原因；动机；理由
拓展：reasonable adj.合乎情理的；公道的
reason常和for连用，意为“……的原因”，但和because 不在一个句子中出现。
※ What is the reason for your long silence
你长时间沉默的原因是什么？
常构成的短语：
for reasons of 为了，出于
within reason 在合理范围内，不过分
※ For reasons of safety, the door is always kept locked.
为了安全，门总是锁着。
6. In recent years, tigers have been in danger of disappearing. 近年来, 老虎已经面临消失的危险。
in danger (of)意为“处于（……）危险之中”。
※ You’re in danger of catching a cold. 你有患感冒的危险。
※ The sick man is in danger of death. 那个病人有死亡的危险。
※ The passengers are in danger! Let’s go and help!
旅客们处于危险之中！咱们去帮忙吧！
7. People have cut down a lot of trees as well.
cut down 砍倒；减少。动副短语，代词作宾语，宾语放中间；名词作宾语放中间或后边。
※ The apple tree was dead, so he cut it down.
那棵苹果树死了，所以他把它砍倒了。
与cut 有关的短语：
cut down砍倒；削减 cut off 切断；中断 cut up 切碎
8. as well ( 除某事或某人外) 还；也 Are they coming as well 他们也来吗？
辨析：as well, too, either与also
① as well 用于肯定句，总是用在句末。as well前不用逗号与句子的其他部分隔开。
※ I am going to London and my sister is going as well.
我要去伦敦，我妹妹也要去。
② too 用于肯定句，常位于句末。too前常有逗号。
※ I’m good at cooking, too.
我也擅长烹饪。
③ either 用于否定句，位于句末。
※ If you don’t go there, he won’t go there either.
如果你不去那儿，他也不会去那儿。
④ also 用于肯定句，一般位于be 动词、情态动词或助动词之后，行为动词之前。
※ Mrs. Green can also sing the song in Chinese.
格林夫人也能用中文唱这首歌。
Work in Groups
at the beginning of 在……之初
the number of ………的数量
drop to 下降到；跌至
be symbol of… 是……的象征
at the top of… 在……的顶端
food chain 食物链
in balance 保持平衡
in danger 处于危险状态
cut down 把……砍倒；减少
as well （除某事某人外）还，也
Practice
Ⅰ.根据汉语提示完成句子。
1. ________________ students is about twenty. (……的数量)
2. It’s ________________ your health. (对……是重要的)
3. The wild animals are __________ now. Let’s protect them.（处于危险中）
4. They __________ a tree to make furniture. （砍倒）
5. ___________________ the party, he gave me a gift. (在……之初)
The number of
important to
in danger
cut down
At the beginning of
Practice
6. The temperature has __________ below zero. (下降到)
7. It is at the bottom of the __________. (食物链)
8. You know, computers bring troubles __________. (也)
dropped to
food chain
as well
Sum up
1. The new words and expressions：
century, courage, brave, reason, kill, cut, fur, symbol, chain, balance, disappear, decrease, at the beginning of…, drop to, food chain, in balance, in danger, cut down, as well
2. Important sentences：
(1) Tigers are symbol of strength and courage.
(2) It helps keep the number of other wild animals in balance.
(3) For this reason, tigers are important to the environment.
Homework
1. Remember the new words and expressions learnt in this lesson.
2. Preview Lesson 18.