Unit 13 We're trying to save the earth! Section A (3a-4c) 课件（31张PPT，内嵌音频）

Section A (3a-4c)
Unit 13 We're trying to save the earth!
Language goals
By the end of the class, you will be able to
1.Master the following words and sentences:
Words: fin, cruel, harmful, chain, ecosystem, industry, law, scientific, afford,
reusable, transportation,
Sentences: ①No scientific studies have showed that shark fins are good for health.
???????? ? ②We should help save the sharks.?
2. Talk about pollution and environmental protection.
Lead in

There are some animals are endangered.
We should do something to protect the animals and the environment!?
Lead in
Have you ever seen a shark?
What do you know about sharks?
Is it important for us to save the sharks? Why?
???
Read the passage about sharks and complete the fact sheet below.
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
develop laws to stop the sale of shark fins
Wild Aid and the WWF
Read the passage about sharks and complete the fact sheet below.
Language points
1. A shark can no longer swim and slowly dies.
鲨鱼不能再游泳然后慢慢死掉。
no longer意思是“不再”?
e.g. I’m no longer a student. 我不再是个学生了。?
有两个短语和no longer同义，即not…any longer和not…any more，但他们侧重的方面不同。
Language points
no longer和not…any longer侧重时间。?
e.g. He no longer lives here.= He doesn’t live here any longer.?
??? 他不在这儿居住了。
(一个时间以前他住在这儿，过了这个时间，他就离开了。)?
not…any more侧重程度和数量
e.g. You can drink no more. = You can’t drink any more.?
你不能再喝了。(喝酒的量到了一定程度，不能再继续下去了。)?
Language points
2. This is not only cruel, but also harmful to the environment.
这不但残忍而且对环境有害。
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. 1) She not only plays well, but also writes music.
????? 她不仅很会演奏，而且还会作曲。?
??? 2) Not only men but also women were chosen.?
?? 不仅仅是男的，女的也有被选中的。?
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. 不只是你，他也得离开。?
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.
?? 这个可怜的人不仅被罚款，而且还被送进了监狱。?
be harmful to? 对……有害
e.g. Smoking is harmful to the health. 吸烟有损健康。
Playing computer games much is harmful to students.
电脑游戏玩太多对学生有害。
Language points
3. 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 在......最高地位; 用最高[最大]的(速度, 声音等)?
e.g. I looked at the top of his head, his hair shiny and parted smoothly.?
?? 我看他的头顶, 头发光亮, 分得平滑。
?? ?? He shouted at the top of his voice in order that he might be heard.
? 他尽力大声叫喊, 以便别人能听见。
Language points
4. 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。
此句复数形式的number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.??
在那个国家，城市儿童入学人数比乡镇及农村要高。
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.
近来拥有轿车的家庭数量增长很快。
Language points
5. Environmental protection groups around the world, such as WildAid and the WWF, are teaching the public about “finning”.?
世界各地的环境保护组织，如野生救援协会和世界自然基金会，都在教育公众有关“猎翅”的行为。
WildAid和WWF组织
WildAid（美国野生救援协会）是保护野生动物及栖息地环境的一个非盈利性的机构，1999年注册成立，其宗旨是保护及救助世界范围内的野生动物
WWF（世界自然基金会）英文全称为World Wide Fund for Nature，成立于1961年，是享有国际盛誉，全球最大的独立性非政府环境保护组织之一。
3b Read the passage again and fill in the blanks with the words in the box.
as
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.
when
so
but
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.
Although　
if
as
although
if
but
when
3b Read the passage again and fill in the blanks with the words in the box.
We're trying to save the earth.
Present progressive
The river used to be so clean.
used to
The air is badly polluted.
Passive voice
No scientific studies have shown that shark fins are good for health.
Present perfect
We should help save the sharks.
Modal verbs
Grammar Focus
现在进行时
表示现在或现阶段正在进行的动作。常用的时间状语有：now，at the moment，right now等。在句首出现look或listen，也可以判断出后面的句子用现在进行时。
e.g. She is watching TV now.
她现在正在看电视。
Look！The panda is climbing a tree.
看！那只熊猫正在爬树。
Grammar
come, go, arrive, leave, start, begin, return等动词的现在进行时形式可以表示将要发生的动作。
e.g. I’m leaving tomorrow.
明天我就要离开了。
Grammar
①概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。
②时间状语：already，yet，just，ever，never，before，in the past/last few years等。
③构成：助动词have/has＋过去分词。
e.g. Have you ever been to Japan?你曾经去过日本吗？
I have just finished my homework.我刚刚完成我的家庭作业。
难点：for＋时间段，since＋时间点，表示一段时间，应将短暂性动词转变为延续性动词，表示动作的持续。
现在完成时
Grammar
表示主语是动作的承受者，即行为动作的对象的一种语态。构成：be＋过去分词。
e.g. The book was written by Lu Xun.
这本书是由鲁迅写的。
主动语态中，在make，let，hear，see，watch，notice等词后跟省略to的动词不定式，但在被动语态中，to不可省略。
e.g. We saw a stranger enter the hall.→A stranger was seen by us to enter the hall.
我们看到一个陌生人进入了大厅。
被动语态
Grammar
4a Fill in the blanks with the correct forms of the verbs in brackets.
Joe：________ you ever ________ (take) part in an environmental project?
Ken：Yes，I have. I________ (help) with a Clean?-Up Day last year. It was
________ (consider) the biggest clean-up project this city_______ ever
________ (have)．
Joe：How many people ________ (take) part?
Ken：I_______ (think) more than 1，000 people _______ (come) to help out.
Joe：That’s fantastic！I guess everyone in this city is_______ (try) to improve the environment.
Ken：Yes，we can’t afford to ________ (wait) any longer to take action!
took
think
considered
has
Have
taken
helped
had
trying
wait
We can’t afford to wait any longer to take action!
afford?? v. 承担得起；提供, 给予
afford to do sth. (常与can, be able to连用) 买得起；有足够的……
e.g. We can’t afford to pay such a price.? 我们付不起这个价钱。
? Dancing affords us pleasure.? 跳舞给我们带来快乐。
Language points
4b Fill in the blanks with the appropriate modal verbs from the box.
can
would
could
have to
should
must
may/might
People________ think that big things________ be done to save the earth. Many forget that saving the earth begins with small things. For example，you________ save electricity by turning off the lights when you leave a room. You________ also use reusable bags instead of plastic bags. I think it’s a great idea that you now________ pay for plastic bags in some
should
may
can
should
have to
stores. And instead of driving to school or work，you ________ ride your bike or walk. If it’s far，you ________ take the bus. All these small things ________ add up and become big things that ________ improve the environment. Let’s take action now!
can
can
can
can
can
would
could
have to
should
must
may/might
4b Fill in the blanks with the appropriate modal verbs from the box.
4c Make a list of things that people can do to help the environment and discuss your list with your partner.
A：I think that everyone should use public transportation.
B：I disagree. It’s difficult for parents with young
children to use public transportation...
use public transportation
_________________________
bring a bag to go shopping
Group work
Discussion.?
A: I think that everyone should use public transportation.
B: I disagree. It’s difficult for parents with young children to use public transportation…
一、根据提示完成单词
1．People especially children are interested in
__________(science) knowledge.
2．You will be punished if you break the _________(法律)．
3．This kind of material is __________( reuse)．Don't throw it.
4．What do you think of the _______________(交通运输)in
your city?
5．Fruit juice can be _________ (harm)to children's teeth.
scientific
law
reusable
transportation
harmful
Exercises
二、根据汉语意思完成句子
1．我的家乡的天空过去常常是蓝色的。
The sky in my hometown ________ ________ ________ blue.
2．我们应该多选择乘坐公共交通工具出行。
We should ______ ______ take public transportation more to go outside.
3．我们很高兴看到我们的城市在过去的几年里变得越来越美丽。
We are happy to see our city ________ ________ more
and more beautiful in the ________ ________ ________ ．
used to
be
choose to
has become
past few years
Exercises
4．我们正在考虑怎么好好利用这些书。
We are thinking about how these books can be
________ ________ ________ ________.
5．旧的楼房已经被拆除了。
The old buildings __________ __________ ________ ________.
have been pulled
put to good use
down
Exercises
Homework
1. Write 5 measures to protect the environment.
2.Review Unit 13-Section B (1a –2e).
Bye-bye!