Unit 13 We're trying to save the earth! SectionA3a—3b课件 (共14张PPT)

(共14张PPT)
Section A 3a—3b
Unit 13
We’re trying to save the earth!
第2课时
Look at the pictures and talk about the animals.
Warming-up
Do you like animals
What kind of animals do you like best
Do you know some endangered animals
Have you ever seen a shark
Can you say something about shark
Do you think they are endangered
Why are they endangered
Pre-reading
Discussion
Where shark fin soup is popular
Number of sharks caught and traded every year
How governments can help
Two environmental groups against “finning”
In southern China.
Around 70 million.
To develop laws to stop the sale of shark fins.
WildAid and the WWF.
Read the passage and complete the fact sheet.
While-reading
( ) 1. We have to kill a whole shark to get a bowl of shark fin soup.
T
( ) 2. People cut off sharks’ fins and throw the sharks back into the ocean.
T
( ) 3. Sharks are in the bottom of the food chain in the ocean’s ecosystem.
F
( ) 4. Shark fins are good for health.
F
Read the passage and choose T or F.
While-reading
Read the passage and fill in the blanks with the words in the box.
so although if but when
1. Many people do not realize they are killing a whole shark ______ they enjoy a bowl of shark fin soup.
2. Sharks are at the top of the food chain, ____ if their numbers drop, the ocean’s ecosystem will be in danger.
3. Many think that sharks are too strong to be endangered, _____ they are wrong.
4. _________ there are no scientific studies to support this, a lot of people
believe that shark fins are good for health.
5. Sharks may disappear one day ___ we do not do something to stop the sale of
shark fins.
when
so
While-reading
Although
if
but
Post-reading
Fill and retell
endangered
slowly dies
over 90 percent
WildAid
stop the sale of shark fins
1. This method is not only cruel, but also harmful to the environment.
这种方法不但残忍而且对环境有害。
(1) not only…but also… 用于连接两个表示并列关系的成分，着重
强调后者，其意为“不仅……而且……”；其中的also有时可
以省略。
e.g. She not only plays well, but also writes music.
Post-reading
Language points
若连接两个成分作主语，其谓语通常与靠近的主语保持一致。
e.g. Not only you but also he has to leave.
not only放在句首，后接句子时要用倒装结构。
e.g. Not only had the poor man been fined, but also he had been sent to prison.
(2) be harmful to 意为“对……有害”
e.g. Smoking is harmful to the health.
Playing computer games much is harmful to students.
Post-reading
2. Sharks are at the top of the food chain in the ocean’s ecosystem.
鲨鱼位于海洋生物系统食物链的顶部。
at the top of 意为“在……最高地位；用最高/最大的 (速度, 声音等) ”
e.g. He shouted at the top of his voice in order that he might be heard.
Post-reading
Post-reading
3. If their numbers drop too low, it will bring danger to all ocean life.
如果它们的数目降至过低，会给所有海洋生物带来危险。
(1) 此句复数形式的numbers表达全海洋中鲨鱼的总量。
当表示数值的高或低时，number要用high或low修饰。
e.g. In that country, the number of children going to school is higher in cities
than in towns and village.
(2) 常与number搭配的动词有grow, fall等。
e.g. The number of families that own cars has been growing quickly recently.
1. This method is not only cruel, but also harmful to the environment.
2. Sharks are at the top of the food chain in the ocean’s ecosystem.
3. If their numbers drop too low, it will bring danger to all ocean life.
Summary
Write an article about a kind of endangered animals to call on people to save them.
Homework
Goodbye!