Section A (3a-4c)
Unit 13 We're trying
to save the earth!
学习目标
Key words & phrases:
cruel, harmful, be harmful to, industry, law, scientific,
take part in, afford, turn off, reusable, pay for, take action
Key sentences:
1. We're trying to save the earth.
2. The river used to be so clean.
3. No scientific studies have shown that shark fins are
good for health.
Lead in
There are some animals are endangered. We
should do something to protect the animals
and the environment!
Save the earth! Save the animals.
The zoos provide homes for many
endangered animals.
1. Have you ever seen
a shark（鲨鱼）?
2. What do you know
about sharks?
Presentation
Where shark fin soup is
popular
Number of sharks caught
and traded every year
How government can help
Two environmental groups
against “finning”
southern China
70 million
develop laws
to stop the sale
of shark fins
WildAid and the
WWF
3a Read the passage about sharks and
complete the fact sheet below.
3b Read the passage again 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.
when
so
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.
but
Although
if
adj. 科学上的，科学的
Retell the passage according to the
words below.
shark fin soup in southern China
each time cut off
no longer not only…but also…
at the top drop
be endangered the strongest
around 70 million fallen by over 90
percent WildAid and the WWF
develop laws scientific studies
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。
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.
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。
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。
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 perfect
We should help save the sharks. Modal verbs
现在进行时: Present Progressive
结构: be (am/is/are) + v.-ing
标志词：look, listen, now, right now…
e.g. Look! The boy is crying.
定义：表示说话时(瞬间)正在进行的
动作, 也表示目前或现阶段正
在进行的动作。
What a fine day today!
Look! What are they doing?
used to do sth. 表示过去常常做某事, 而现
在往往不做了, 后接动词原形。
be used to doing sth. 表示习惯于做某事
e.g. I used to get up at six o’clock.
Joe is used to drinking a cup of coffee every morning.
used to do与be used to doing
Translation.
1. 她过去常常周末和朋友闲逛。
She used to hang out with friends
on weekends.
2. 他习惯于每天晚上熬夜。
He is used to staying up every
night.
被动语态：Passive voice
定义：表示主语是动作的承受者，即行
为动作的对象的一种语态。
结构：be + 过去分词
e.g. A new school was built last year.
Our classroom is cleaned every day.
Translate the sentences by using
Passive voice.
1. 刚才一些老年人参观了博物馆。
2. 工人们使用不同种类的机器工作。
The museum was visited by some old
people just now.
Different kinds of machines are used
to work by the workers.
结构: has/have + 过去分词
标志词：already, yet, ever, never, since,
for…
e.g. I haven’t finished my homework yet.
定义：表示动作已经完成, 但对现在造成影
响; 或者表示从过去某一时间开始一
直延续到现在并还可能持续下去的
动作。
现在完成时: Present Perfect
Complete the following sentences.
1. I _________ (be) in Beijing for two years.
2. I _____ never _____ (hear) of that
man before.
3. Tom __________ (work) there since
two years ago.
have been
have heard
has worked
4. The twins ___________ (wash) the
clothes for an hour.
5. He _________ (play) basketball
since three years ago.
6. How long ____ Sally _____ (sing)
yet?
have washed
has played
has sung
1. 情态动词本身有一定的词义, 表示说话人
的情绪、态度或语气, 但不能单独作谓
语, 只能与其他动词构成谓语。
常见的有: can (could), may (might),
must, need, shall (should), will
(would)等。
情态动词
2. 情态动词无人称和数的变化, 后接动词原
形。否定式是在情态动词后面加not。个
别情态动词有过去式形式, 可用来表达更
加客气、委婉的语气。
e.g. Ken can climb up the tress like a
koala.
Tracy could ride a bicycle when
she was five years old.
You mustn’t play with fire. It is
dangerous.
Translation.
1. 我们不能在教室里吃东西。
2. 首先你必须完成作业。
3. 他现在不可能在家。
4. 她一定知道这个问题的答案。
We can’t eat in the classroom.
You must finish your homework first.
He can’t be at home now.
She must know the answer to this question.
4a Fill in the blanks with the correct
forms of the verbs in brackets.
Joe: _____ you ever ______ (take) part in
an environmental project ?
Eric: 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
参加
Joe: How many people ____ (take) part?
Eric: 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.
Eric: Yes, we can’t afford to ____ (wait)
any longer to take action!
took
think
came
trying
wait
v. 承担得起(后果); 买得起
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
may/might
must
can
can would could have to
should must may/ might
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 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
could
have to
can/should
can/could
关掉adj.可重复使用的
付费;付出代价
small things ______ add up and become big things
that _________ improve the environment. Let’s
take action now!
could
would/can
采取行动
4c
Make a list of things that people can do
to help the environment and discuss
your list with your partner.
use public transportation (n.交通运输); …
I think that everyone
should use public
transportation.
I disagree. It’s
difficult for parents
with young children
to use public
transportation…
口头作业 (Oral work)
熟读课文Unit 13 Section A （3a）
书面作业 (Writing work)
学练优 Unit 13 Section A
第二课时
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