2017人教版九年级英语unit13sectionA3a
英语人教版九年级全册unit13 Section A (3a-3b)教案
方法
According to finishing some tasks to train students’ integrating skills and train the ability of expressing students’ own opinions．
情感
态度
Animals are our friends．We must know how to love them and how to protect them．That way, It is good for both animals and us．
学习策略
Reading for specific information.
Taking notes, cooperative learning.
重点
Target Language
难点
How to improve students’ integrating skills．．
教学内容及问题情境
学生活动
设计意图
Unit13 SectionA（3a-3b）教案
学科
English
年级
9
班级
课题
Unit 13 we’re trying to save the earthSection A 3a-4c
话题
Protecting the environment
功能
Talk about pollution and environmental protection
3. Have the students fill in the blanks in 3b with the words in the box individually. And check their work with some students.
英语人教版九年级全册Unit13 sectionA 3a-3b 教学设计
Unit 13 We’re trying to save the earth!Section A 3a -3b话题: Protecting the animals一、教学目标：1. 语言知识目标基本词汇：shark, cruel. harmful, chain, ecosystem, industry, law, scientific,基本词组：cut off, be harmful to, throw back to ,no longer, at the top of something,bring danger to, be endangered, thenumber of, be good for, the sale of基本句型：We’re trying to save the earth!The river used to be so clean.The air is badly polluted.No scientific studies have showed that shark fins aregood for health.We should help save the sharks.2.技能目标: 1）.Try to know how to use the grammar, such as thepresent tense,the present perfect tense, the passivevoice and modal verb.3.情感目标: Animals are our friends. We must know how to love themand how to protect them．That way, It is good for bothanimals and us.4.过程方法：According to finishing some tasks to train students’integrating skills and train the ability of expressingstudents’ own opinions．二、教学重难点：1. 教学重点：（1）.Try to know how to use the grammar, such as the presenttense, the present perfect tense, the passive voice and modalverb.（2）.The methods of protect animals and environment.2. 教学难点：How to improve students’ integrating skills．三、学习策略：Reading for specific information .cooperative learning四、教学步骤:Step1: Leading in and pre-reading.Show students pictures of pandas, tigers and sharks and so on. Get students learn the meaning of the new words “shark fin ,cruel ect”.By showing a video gave students know how people get the shark fin and ask them “Do you still want to try shark fin soup?” next, show the pictures of process of getting shark fin and making shark fin soup, get students know the meaning and the urgency of Saving sharks! Step 2: While-readingTask1. Reading the whole passage quickly and find the main idea of this passage. At the same time, get the students know some reading tips like Looking at the pictures and the topic, You can get some main information about the text. Besides, have students get the the meaning of each paragraph with reading tip2 like Find out the key words in each paragraph. You can get some informationTask2.Read Para1 and judge the sentences.(True or false)1).Shark fin soup is famous and expensive all around the world.( false)in Southern China2).You’re killing a whole shark each time when you enjoy a bowl of shark fin soup.(True)Scanning :Para2.Find out the topic sentence in this paragraph with Reading Tip 3 The topic sentence gives us the main idea of each paragraph. It may be at th e beginning or end of the paragraph, sometimes it’s also in the middle ,then finish the tasks about Why it is cruel? And Why is it harmful to the environment.Task3:ScanningRead Para.3 and answer the questions :1.What are the names of the two environmental protection groups ?2.What do the environmental protection groups around the world do to fight against “ finning” ?3. Have any scientific studies shown that shark fins are good for health? After that, lead in the fact some problems of eating shark fin soup. Task4. After readingGuide the students to understand how the write writer analyzes the problem in this article, such as Proposing (提出) the fact (Para1), Analyzing (分析) the problem( Para 2), and Solving the problem( Para 3).Step4:According to the text ,finish the exercises3a-3b. Then in order to test how students master the key points in the article, complete a passage. Some people like eating shark fin soup, especially in________China.A whole shark has been killed_______ you enjoy a bowl of shark fin soup. When people catch sharks, they ______ their fins and throw theshark back into the ocean. Without a fin, a shark can __________ swim and slowly dies. If sharks’ numbers drop too low, it will _________ all ocean life. __________ some kinds of sharks have _______ by over 90 percent in the last 20 to 30 years.So they are__________.Let's ______sharks.Step5. GroupworkSay: What can we do to protect the endangered animals? (Suggestions Wanted)First have students discuss how to protect the endangered animals. Then ask some of the students to give suggestions. if possible, I will help them.Step6.HomeworkMany wild animals are endangered now.Write about how to protect the endangered animals.Advice: Students should give present situation(现状),reasons and solutions in their compositions.。
英语人教版九年级全册UNIT13 SectionA3a
protecting the environment.
To reinforce the target language for
talking about environmental protection.
Let’s talk about …
○ although: used to contrast one
part of a sentence with another,
has the effect of making the main
idea in the sentence seem
surprising or unexpected.
e.g. Although she studied hard, she
学科 课型
课题
English
年级
9
班级
fresh
课时 3 / 6 媒体 a tape recorder, CAI
Unit 13 we’re trying to save the earth
Section A 3a ~
4c
话题 Protecting the environment
功能 Talk about pollution and environmental protection
that is popular not only in China, but
also among the Chinese population in
other countries like Singapore and
Malaysia. Review of conjunctions ○ so: used to say that something is
a result of something else that has just been mentioned. e.g. I was tired, so I decided to take a map.
Unit13SectionA3a3b课件人教版九年级英语全册
exercises Fill in the blanks with the words in the box.
so although if but when
1. He studied hard, he did not pass the exam.
2. I was tired, I decided to take a nap.
At the top of“在……顶部 反义短语“at the bottom of ” “在……底部” At the top of the mountain, we saw the beautiful sunrise.
Thank you!
Байду номын сангаас
be harmful to sb./sth.”对某人、某事有害” =do harm to /be bad for
Smoking is bad for our health. Smoking does harm to our health.
die此处为不及物动词，意为“死，死亡”， 其过去式和过去分词皆为died, 现在分词为dying, 形容词为dead/dying. 例: The old man died of cancer yesterday. 昨天那位老人死于癌症。 die是短暂性动词，不能与表示一段时间的"for 短语”连用， 如“他死了三天”不能说"He has died for three days." ,而应说 "He has been dead for three days."或"He died three days ago.".
Have you ever drunk shark fin soup?
人教版九年级英语Unit 13 Section A (3a~3b)
Unit 13 We’re trying to save the earth!Section A (3a~3b)教学目标【知识与技能】1.掌握句型：So far, no scientific studies have showed that shark fins are good for health.2. 掌握本课单词和短语：cruel, harmful, shark, fin, chain, ecosystem, industry, law, scientific, be harmful to, at the top of3. 掌握本课语法：能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
【情感、态度与价值观】有环境危机意识，学会关注环境保护环境。
教学重难点【教学重点】掌握句型：1）能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
2）保护环境的措施方法。
【教学难点】能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
教学过程Step 1 Lead in(1) Teacher tells students the earth is badly polluted. What should we do to save the earth? Let’s take action. For example:①Turn off the lights when you leave a room;②Take buses instead of driving cars③Recycle books and paper.(2) There are some animals are endangered. We should do something to protect the animals and the environment!Step 2 ReadingSharks are endangered, read the passage and judge the sentences.①Shark’s fin（鱼鳍）soup is famous and expensive all around the world.②We have to kill a whole shark to get a bowl of shark’s fin soup.③People cut off sharks’ fins and throw the sharks back into the ocean.④Sharks are in the bottom of the food chain in the ocean’s ecosystem.⑤WildAid and the WWF are environmental protection groups in China.⑥Shark’s fin s are good for health.Complete the fact sheet in 3a.Where shark fin soup is popularNumber of sharks caughtand traded every yearHow much the numbers ofsome kinds of sharks havefallen in the last 20 to 30yearsTwo environmental groupswhich are against “finning”Step 3 Practice(1) Read the passage and dill 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.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.(2) Retell the passage according to the words below.shark’s fin soup, in southern Chinaeach 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 studiesStep 4 Language points1. A shark can no longer swim and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。
人教版英语九全Unit13SectionA(3a3b)实用教学设计
3.合作学习，提高能力：
-采用小组合作的形式，让学生相互讨论、交流，提高学生的合作能力和解决问题的能力。
-鼓励学生在小组内分享学习心得，相互借鉴，共同进步。
4.精讲多练，巩固知识：
-对一般过去时的用法进行详细讲解，结合实例进行剖析，让学生更好地理解。
2.培养学生的跨文化意识，让学生了解并尊重不同国家和民族的文化差异。
3.培养学生的自信心和自主学习能力，使学生意识到学习英语的重要性，提高学生的英语学习兴趣。
4.通过学习名人的优秀品质，引导学生树立正确的价值观，培养学生的道德品质。
在教学过程中，教师应注重学生个体差异，关注学生的学习需求，创设生动活泼的课堂氛围，使学生在轻松愉快的氛围中学习英语，提高英语综合运用能力。同时，教师应关注学生的情感态度和价值观的培养，使学生在学习英语的过程中，形成积极向上的人生态度和价值观。
2.通过听力练习，提高学生的英语听力水平，培养学生的听力技巧。
3.通过阅读练习，提高学生的阅读理解能力，培养学生提取关键信息、概括文章主旨的能力。
4.通过写作练习，提高学生运用一般过去时描述名人事迹的能力，培养学生的写作技巧。
（三）情感态度与价值观
1.了解名人的成就和经历，激发学生对名人的敬仰之情，培养学生的励志精神。
4.针对听力方面的差异，教师可提供不同难度的听力材料，逐步提高学生的听力水平。
三、教学重难点和教学设想
（一）教学重难点
1.重点：本节课的重点在于学生对一般过去时的掌握，以及能够运用该时态描述名人的成就和经历。此外，学生对文章中出现的词汇、短语的理解和运用也是教学的重点。
2.难点：一般过去时的用法和词汇的运用是学生学习的难点。学生对时态的运用容易出现混淆，对词汇的搭配和语境运用不够熟练。
人教版九年级英语Unit13SectionAperiod3课件共31张
We are trying to save the earth.
Grammar Focus We are try to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted.
A: I think that everyone should use public transportation.
B: I disagree. it's diffcult for parents with young children to use public transportation...
No scientific studies have shown that sharks fins are good for health.
We should save the sharks.
Passive voice Present perferct Model verbs
4a Fill in the blanks with the correct
is t_r_y_in__g (try) to improve the environment. Ken: Yes, we can't affort to _w__a_it_ (wait) any
longer to take action!
4b Fill in the blanks with the appropriate
4Hale Waihona Puke Discussing...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...
人教版九年级英语 Unit13 Section A2 3a-3b 课件
Is eating shark fin soup good for our health?
3a Read the passage about sharks and
complete the fact sheet below.
Where shark fin soup is popular
in southern China
Number of sharks caught and traded every year
around 70 million
How much the numbers of some kinds of sharks have fallen in the last 20 to 30 years
轿车的数量增长很快。
常与number搭配的动词drop, grow, fall等。
当表示数值的高或低时， number要用high或low修饰。
Not only the man but also the women
___w_e_r_e__ (be )chosen.
不仅仅是男的，女的也有被选中的。
rible
dangerous
Sharks are at the top of the food chain in the ocean’s ecosystem.
A food chain
Who is the real king of the food chain?
Human beings
dangerous
Two environmental protection groups
A. They are teaching the public about “finning”.
《学海风暴》2017春英语人教版九年级下(课件)Unit13SectionA3a-3b
Where shark fin soup is popular In southern China
Number of sharks caught and traded every year
How governments can help
Two environmental groups against "finning"
3. Many think that sharks are too strong to be endangered, ____b_u__t _____ they are wrong.
4. __A_l_th_o_u_g_h__ there are no scientific studies to support this, a lot of people believe that shark fins are good for health.
—Yes. _____ them is about 200. A. The number of；A number of B. The number of；The number of C. A number of；the number of D. A number of；A number of
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。
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。)
中国南部
英语人教版九年级全册unit 13 Section A 3a
Unit 13 We are trying to save the earth! Section A 3a Save the sharks各位老师：你们好! 我说课选定的内容是根据新人教版九年级英语全册第13单元We are trying to save the earth!的第二课时Section A 3a ,3b。
今天，借此平台，有机会与各位同行交流，希望大家指导我的说课。
谢谢！我主要是从学情分析、教材分析、教学目标、教学策略、教学过程、效果预测等几个方面进行具体的阐述。
一．Analysis of the students` learning condition(学情分析)九年级学生在心理方面相对比较成熟，思维也非常活跃。
虽然已经掌握了一定的英语基础，但是部分学生学习兴趣不高。
教学活动中尽量让他们参与到活动中来，创造更多的机会，鼓励他们多说英语，树立学好英语的自信心。
因此在教学中我不光注重知识的传授，还重视培养学生的学习兴趣。
二．Analysis of the teaching material(教材分析)Section A 3a版块是阅读任务。
3a 的阅读是一篇倡议书，其中介绍了人类捕捉鲨鱼获取鱼翅，破坏生态平衡的情况，文章紧扣单元话题，呼吁人们保护鲨鱼，渗透了对学生的情感教育。
3a的阅读任务是要求学生阅读文章，根据文章内容填写表格，目的是考察学生对文章细节的掌握。
三．Teaching objectives(教学目标)By the end of the class, the students should be able to:1. have a better understanding and greater knowledge about sharks.2. protect the sharks and the environment.四：Important and difficult points.(重点难点)1. to get the students to understand the text carefully.2. to get the students to know the importance of save the shark.3. to get the students to know how to save the earth.五．Teaching aids(教具)Multi-media, PPT, Blackboard六：Teaching method:Task –based language teaching method, guided discovery method信息技术学科教学目标：本节课我采用多媒体课件（PPT）进行教学，创设英语学习情境，调动学生学习兴趣。
人教版九年级全册英语Unit13SectionA3a3b教学设计
在本章节的教学过程中，教师将采用以下方法引导学生掌握知识：
1.采用任务型教学法，设计各种实践活动，让学生在完成具体任务的过程中，运用所学知识进行交流和表达。
2.利用小组合作学习，培养学生的团队协作能力和口语表达能力。
3.通过阅读和分析文章，引导学生学会抓住文章的主旨和关键信息，提高阅读理解能力。
7.挖掘名人的优秀品质，设计相关主题活动，如演讲、手抄报等，让学生在实践中感受名人的精神风貌，激发他们追求卓越的动力。
8.结合社会主义核心价值观，引导学生树立正确的价值观，培养他们的责任感和使命感。
四、教学内容与过程
（一）导入新课
1.教师通过展示名人的图片和简介，如马云、居里夫人等，引导学生思考：“What do you know about these famous people? What do they contribute to our society?”（你们对这些名人有什么了解？他们对社会做出了哪些贡献？）
2.学生分享学习心得，讨论如何将所学知识运用到实际生活中，培养自己的优秀品质。
3.教师强调名人的优秀品质对个人成长的重要性，鼓励学生在今后的学习和生活中，积极追求卓越，为社会作出贡献。
4.布置课后作业，巩固所学知识，为下一节课的学习做好准备。
五、作业布置
为了巩固本章节所学知识，培养学生的语言运用能力和自主学习能力，特布置以下作业：
4.采用启发式教学法，激发学生的思维，培养他们独立思考和解决问题的能力。
（三）情感态度与价值观
在本章节的学习中，学生将培养以下情感态度和价值观：
1.学习名人的优秀品质，如敬业、奉献、创新等，激发学生对这些品质的认同和追求。
2.通过了解名人的成就和贡献，培养学生积极向上、努力拼搏的精神风貌。
Unit 13 Section A(3a-3b)九年级英语全册(人教版)
groups
government
people
1.Never eat shark fin soup 2.Call on (号召) the people to protect the sharks.
3.Volunteer in the protection groups 4.Punish(惩罚) the people who kill the sharks...
Sharks are _a_t_t_h_e_t_o_p_o_f___the food chain in the ocean's ecosystem.
If their _n_u_m__b_e_r_s_ drop too low, it will_b_r_in__g_d_a_n_g_e_r_t_oall ocean life.
Sharks are at the top of the food chain.
They live in the ocean. They are the strongest and the most dangerous animal in the ocean.
at the top of the food chain
_T_h_e__n_u_m_b__er_s__o_f _s_o_m_e__k_in_d__o_f_s_h_a_r_k_s_ decreased quickly
Why?
They have lived in the ocean for over 400 million years, even older than the dinosaurs.
5.Good expressions(2’)
We need to work together to foster a community of life for man and nature(构建人与自然共同体).
Unit13SectionA3a3b课件人教版英语九年级全册
Unit 13 We’re trying to save the earth!Period 2 (Section A 3a3b)一、教学目标1. 语言知识目标：(1) 掌握以下重要单词短语：cruel, industry, scientific, be harmful to, at the top of …(2) 学习以下重要句型：This is not only cruel, but also harmful to the environment.No scientific studies have shown that shark fins are good for health.We should help save the sharks.(3) 复习以下语法：现在完成时，情态动词(4) 观察我们身边存在的环境问题，呼吁从我做起，保护地球。
2. 语言技能目标：能读懂有关环境污染和环境保护话题的文章，了解鲨鱼所面临的危险处境，拒绝食用鱼翅。
3. 情感态度价值观目标：本单元以“pollution and environmental protection”为话题，谈论目前的环境现状、存在问题，呼吁保护环境，树立环保意识。
引导学生根据不同语境选择不同时态来表述环境问题，并能正确认识人与自然的关系。
4. 学习策略目标：本节课重在培养学生阅读策略，鼓励学生积极用英语和他人交流。
5. 文化意识目标：学生能用恰当的时态和语态描述环境问题，树立环保意识。
二、教学重难点1. 教学重点：(1) 掌握本课时重要单词、短语及句型。
(2) 复习现在完成时及情态动词的语法。
2. 教学难点：(1) 了解鲨鱼所面临的危险处境，引导学生树立“保护鲨鱼，拒绝食用鱼翅”的意识。
(2) 引导学生思考解决我们身边环境问题、保护地球的有效举措。
三、教学方法本节阅读课采用活动教学法和合作教学法相结合的方法。
四、教学过程Step 1 LeadinFree talk:T: 2019nCoV(新冠状病毒), which has killed hundreds and infected thousands, is believed to originate from a kind of bats. Some people ate the bats and the virus beg an to spread among humans. It’s the danger of killing or eating wild animals! What are the endangered animals in the world?S: … sharks.Step 2 PrereadingT: What do you know about sharks?S: They live in the ocean.They are the strongest and the most dangerous animal in the ocean.…Step 3 WhilereadingFast reading:1. Skimming: Read the passage quickly. What is the main idea of each paragraph? Please underline the key phrases or sentences.2. Scanning: Read the passage and plete the fact sheet in 3a. (P99)3. Scanning: Read the passage and choose T or F.Careful reading:1. Read Para. 1 and answer three questions.2. Read Para. 2 and plete the fact sheet.3. Read Para. 3 and plete the chart.Step 4 Postreading1. No buying, no killing. Say no to shark fin soup!2. How can we protect our animals?1) We should raise people’s awareness to protect animals and our environment.2) We should not wear or buy the clothes made by an animal fur.3) We should not eat wild and endangered animals.4) We should protect their living environment.3. 3b. Read the passage again and fill in the blanks with the words in the box.4. Retell the passage by filling in the blanks.5. Finish the mind map.6. Review the new words and phrases.Step 5 Language points1. not only… but also …2. no longer3. numberStep 6 Exercises略Step 7 HomeworkWrite 5 measures to protect the environment.五、板书设计。
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2. What does the passage may talk about? 2. It may talk about the sharks.
Before reading
Save the sharks !
②
every year.
endangered
2.The numbers of some kinds of
sharks have fallen by over 90
percent in the last 20 to 30 years.
Mind Map 思维导图
Fact
When…catch , cut off , throw…back into
Save the sharks !
Reading Tip 1
Look at the picture and the topic carefully. You can get some information. (仔细阅读文章插图及标题)
Before you read
Look at the photo, the questions in 3a and the title to the story on page 99. Then answer the questions below.
shark fin soup.
Skimming 略读
Read and Match
Para1.
endangered sharks
Para2.
shark fin soup
Para3.
Help save the sharks!
Reading Tip 2
Find out the key words in each
Next ,
the fins are cut (cut) off by people.
切除
Then , the shark fins are cooked (cook) into the shark fin soup by people.
鱼翅羹
Finally , the shark without fins is thrown (throw) back into the ocean by people.
fins and throw the sharks back into the ocean.
①
cruel Without a fin, a shark can no longer swim
and slowly dies.
&
1.Sharks are at the top of the food
harmful chain in the ocean’s ecosystem.
2 different opinions
Para2.
…not only cruel, but also harmful …
Many believe… never be endangered.
Without , no longer
1. 70: are caught & traded
1. at the top of the food chain
2. 90: The numbers of, have fallen,
in the last 20 to 30 years
2. If, bring danger to…
Scanning 寻读Para3.
What are the names of the two environmental protection groups ?
Scanning 寻读 Para2. True or false: Sharks can never be endangered.( F)
in fact
1.Around 70 million sharks are caught (catch) and traded (trade)in this industry every year.
扔回到…
What will happen to the shark ? What should we do?
especially /ɪ‘ speʃəli / adv. 尤其地; 格外地;
ocean Save t/h‘eəʊshʃanrk/s ! n. 海洋
cruel
/ kru:əl / adj. 残酷的；残忍的
harmful /' hɑ:mfl / adj. 有害的
environment /ɪn' vaɪrənmənt /n.环境
chain
/tʃeɪn /
n. 链子；链条
ecosystem / ' i:kəʊsɪstəm /n. 生态系统
Hale Waihona Puke low/ləʊ /
adj. 减少的；低/矮的
endangered /ɪn‘deɪndʒəd/adj.濒临灭绝的
two different opinions
2.If their numbers drop too low, it will
bring danger to all ocean life.
1.Around 70 million sharks are
caught and traded in this industry
Para3. What can WCihldeAcikd mtheempbreersvdieowtoinsagvhe othme eshwaorkrks?.
世界自然基金会
Para3.
Let’s save the animals.
Save the animals
begins with
Save the earth
This is not only cruel , but also harmful to the environment .
Scanning 寻读 Para2.
fact
When people catch sharks, they cut off their fins and throw the sharks back into the ocean.
Scanning 寻读 Para1. Read and judge the sentences.
(F)①Shark fin soup is famous and expensive
allinarsounthdetrhneCwhoirnlad..
(T) ②You’re killing a whole shark when you
1. You should:
Write down at least 5 suggestions to protect the endangered animals.
2. If you like:
Discuss and make a report: How to cut down the air pollution in our city
Thanks
What’s the main idea of the article?
A.The shark fin soup is famous and expensive. B.The sharks are endangered in the world. C. People cut off sharks’ fins to make the
Things around
us
such as
Air pollution Water pollution Noise pollution
…
The Air Pollution in Jinan
Group work:（四人小组合作）
What can we do to cut down the air pollution?
paragraph. You can get some information. (找出每段的关键词)
Skimming 略读
Save the sharks !
Read and Match
Para1.
endangered sharks
Para2.
shark fin soup
Para3. Help save the sharks!
cruel WaitnhdWoustlhoawyfliyni,dsaiessih.tarck rcaunenlo ?longer swim
harmful
1.iSnhWtahrekhsoycaereainsa’tstihetceohtsoyapsrotefmmth.feufolod chain
to the environment ?
enjoy a bowl of shark fin soup.
= each time
=
Scanning 寻读 Para2.
Find out the topic sentence (主旨句)in this paragraph.
Reading Tip 3 The topic sentence gives us the main idea of each paragraph. It may be at the beginning or end of the paragraph, sometimes it’s also in the middle. (主旨句通常能概括段落大意，承上启下，它常位 于段首、段末，有时也出现于段中。)
Unit 13 We are trying to save the earth.
(Section A 3a)
shWarhkat/ʃɑh:ka/ np. p鲨e鱼ns to the shark?