Unit 13 We're trying to save the earth! Section A (3a~4c)课件(共42张PPT)

(共42张PPT)
Unit 13
We’re trying to save the earth!
Section A (3a~4c)
1.学习目标
3.重点探究
2.自主学习
学习导航
5.当堂检测
6.课堂总结
4.拓展提升
新课导入
视频：保护鲨鱼
学习目标
1. 能熟悉并正确运用本课时的重点单词和短语
2. 能用英语谈论鲨鱼现状和保护方式
3. 能熟练运用现在进行时等时态及情态动词
自主学习
New words & phrases
shark [ a:(r)k] n. 鲨鱼
fin [fin] n.（.鱼）鳍
cut off 割掉；砍掉
method [meθ d] n. 方法；措施
cruel [kru: l] adj. 残酷的；残忍的
harmful [ha:(r)mfl] adj. 有害的
chain [t ein] n. 链子；链条
自主学习
New words & phrases
ecosystem [i:k usist m] n.生态系统
low [l u] 减少的；低的；矮的
industry [ind stri] n. 工业；行业
law [l :] n. 法律；法规
reusable [ri:ju:z bl] adj.可重复使用的;可再次使用的
afford [ f :(r)d] v. 承担得起（后果）；买得起
transportation [t nsp :(r)tei n] n. 运输业；交通运输
重点探究
3a Read the passage about sharks and complete
the fact sheet below.
Many have heard of shark fin soup. This famous and expensive dish is especially popular in southern China. But do you realize that you’re killing a whole shark each time you enjoy a bowl of shark fin soup
When people catch sharks, they cut off their
fins and throw the shark back into the ocean. This is not only cruel, but also harmful to the environment.
Without a fin, a shark can no longer swim and slowly dies. Sharks are at the top of the food chain in the ocean’s ecosystem. If their numbers drop too low, it will bring danger to all ocean life. Many believe that sharks can never be endangered because they are the strongest in their food chain.
But in fact, around 70 million sharks are caught and traded in this industry every year. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
Environmental protection groups around the world, such as WildAid and the WWF, are teaching the public about “finning”. They have even asked governments to develop laws to stop the sale of shark fins. So far, no scientific studies have shown that shark fins are good for health, so why eat them Help save the sharks!
Where shark fin soup is popular
Number of sharks caught and traded every year
How governments can help
Two environmental groups against "finning"
70 million
develop laws to stop the
sale of shark fins.
WildAid and the WWF
Southern China
Some people like to eat shark fin soup, especially in _______China. But getting the shark's fin is very _____. When people catch sharks, they ____ ____their fins and throw the sharks into the ocean. The shark slowly dies because it can't _____ without the fin. And it is also _______ to environment. Sharks are at the ____ of the food chain. If the number of sharks drops too low, it will break the balance of nuture. Please say no to eating the shark fin soup, and take action to save the sharks!
Let's do this to review the text !
southern
cruel
cut off
swim
harmful
top
3b Read the passage again and fill in the blanks
with the words in the box.
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.
so although if but when
so
when
Many think that sharks are too strong to be
endangered, _________ they are wrong.
_________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.
but
Although
if
so although if but when
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，但它们侧重的方面不同。
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。)
2. 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also有时可以省略。
e.g. She not only plays well, but also writes music.
她不但很会演奏，而且还会作曲。
Not only men but also women were chosen.
不仅仅是男的，女的也有被选中的。
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。
2) be harmful to 对……有害
e.g. Smoking is harmful to health.
吸烟有害健康。
Playing computer games toomuch is harmful to students.
电脑游戏玩太多对学生有害。
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, 头发闪亮且平滑地分开。
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。
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 that in towns and villages.
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。
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。
1) 句中fin本为名词，指 “鱼鳍”。此句中的
finning由动词化的fin（割鲨鱼鳍以获取鱼翅）的-ing形式转化而成，指课文中所陈述的 “猎翅”这一行为。
2) 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。
拓展提升
Grammar Focus
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 perferct
We should help save the sharks. Modal verbs
现在进行时
(1) 含义：表示正在发生或进行的动作。
(2) 基本结构：
主语 + be + 现在分词（be 的形式随主语的变化而变化）
(3) 基本用法：
①表示现在正在进行的动作。
特征：常常与now或具体的时间连用，有时句中会有感官
动词来提示，或通过上下文来暗示。
②表示现阶段一直进行的动作。这类动词常常是延续性动词。常于at present, this week, these days等连用。
③表示主语的特征、性格、能力等
现在完成时
(1) 含义：表示过去发生的动作对现在还有影响。
(2) 基本结构：主语 + have / has + 过去分词
(3) 基本用法：
①表示过去发生的动作，但强调对现在产生影响。
特征：不能与表示具体的时间状语连用。
②表示过去发生的动作或存在的状态一直延续到现在，还可能继续下去。常常与since, for, in the past + 时间名词，in the last +时间名词等时间状语连用，而且谓语动词要求是延续性动词。
③表示一种“经历或体验”，即可以表示经历过也可以是从来都没有经历过。
被动语态
初中阶段我们学习了七种被动结构，归纳如下：
(1) 一般现在时的被动语态：am / is / are + 过去分词
(2) 现在完成时的被动式：have / has + been + 过去分词
(3) 现在进行时的被动式：am/ is/ are + being + 过去分词
(4) 一般过去时的被动式：was / were + 过去分词
(5) 过去进行时的被动式：was / were + being + 过去分词
(6) 过去完成时的被动式：had + been + 过去分词
(7) 一般将来时的被动式：will / be going to be+ 过去分词
(8) 含有情态动词的被动式:情态动词+be +动词的过去分词。
情态动词
情态动词表示说话人对某一动作或状态的态度，
如认为“可能”、“应当”、“必要”等。
情态动词本身有一定的意义，但不能单独作谓语，也没有人称和数的变化。后面一般跟动词原形。
used to句型
used to意为“过去常常做某事”，指的是过去的习惯性动作，目的在于与现在形成对照。used to是个情态动词，其中的to是不定式符号，后面跟动词原形。
在美式英语中,它的疑问式是：Did ＋主语＋use to do sth.？否定式是：主语＋didn't use…
在英式英语中，它的疑问式应当是：Used ＋主语＋to sth.？否定式应当是used not to或use(d)n’t to。
He used to stay up late. 他过去常熬到很晚。
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).
Have taken
helped
considered
had
had
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
came
trying
wait
4b Fill in the blanks with the appropriate modal verbs
from the box.
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.
may
must
could
could
can would could have to should must may/might
can would could have to should must may/might
I think it’s a great idea that you now _______ pay
for plastic bags in some 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 good
things that ____ improve the environment. Let’s take action now!
have to
can
could
can
can
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
...
Discuss
use public transportation
take your own shopping bags when go shopping
reduce the use of air conditioners in summer
turn off the lights when you leave the room
grow more plants...
A: I think that everyone should take your own shopping bags when go shopping.
B: I agree. It's good for the environment.
A: I think that everyone should reduce
the use of air conditioners in summer.
B: I disagree. The summer is so hot, especially in south China. Without air conditioners, people may not have the patience to work.
当堂检测
Ⅰ. 选择方框中的词并用其适当形式填空。
1. I think it's _____ to make such a young boy work all day.
2. The poor fisherman can't _____ his children's education.
3. I think the government must develop _____ to protect
environment.
4. Eating too much junk food is _______ to your health.
5. He can use different _______ to work out the problem.
cruel
afford
laws
harmful
methods
method, cruel, harmful, afford, law
Ⅱ. 根据汉语提示完成句子，每空一词。
1. 我们必须采取行动来阻止他们。
We must _____ ______ to stop them.
2. 我从没听说过这个人。
I have never ______ ____ such a man.
3. 我们乐意尽力帮你摆脱困境。
We are glad to do what we can do ___ ___ you___.
4. 到目前为止，我已经交了二十个朋友了。
____ ____, I have made twenty friends.
5. 实际上，她从没去过那儿。
____ ____, she has never been there.
In fact
take action
heard of
to help out
So far
课堂总结
重要语法：
现在进行时
现在完成时
被动语态
情态动词
used to句型
重要短语：
no longer 不再
not only…but also…不仅……
而且……
be harmful to 对……有害
at the top of 在……最高地位
Unit 13
Section A (3a~4c)