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必修二英语unit4英文说课稿

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必修二英语unit4英文说课稿

篇1：英语必修二unit4教案

Unit 4 保护野生动植物

How Daisy learned to help wildlife

戴茜是如何学会保护野生动物的

Daisy had always longed to help endangered species of wildlife.

戴茜一直以来都渴望帮助那些濒临灭绝的野生动物。

One day she woke up and found a flying carpet by her bed.

一天她醒来，发现床边有一块飞毯。

“Where do you want to go?” it asked.

飞毯问：“你想去哪儿?”

Daisy responded immediately. “I’d like to see some endangered wildlife.”

戴茜立刻回答道：“我想去看看濒临灭绝的野生动物。”

she said. “Please take me to a distant land where I can find the animal that gave fur to make this sweater.”

她说：“请带我到遥远的地方，在那里我可以发现为制作这件毛衣而提供毛绒的那种动物。”

At once the carpet flew away and took her to Tibet.

飞毯立刻起飞了，带她到了中国的西藏。

There Daisy saw an antelope looking sad.

在那里，戴茜看到一只藏羚羊面带忧郁的神色。

It said, “We’re being killed for the wool beneath our stomachs.

它说：“为了取得我们肚皮底下的羊毛，我们正在被屠杀。

Our fur is being used to make sweaters for people like you.

我们的毛被用来为像你一样的人们制作毛衣。

As a result, we are now an endangered species.”

因此，我们现在濒临灭绝了。”

At that Daisy cried, “I’m sorry I didn’t know that.

听了这话，戴茜哭了：“我很抱歉，我过去不知道还有这回事儿。

I wonder what is being done to help you.

我不知道为了帮助你们正在采取什么措施。

Flying carpet, please show me a place where there’s some wildlife protection.”

飞毯啊，请把我带到一个有野生动植物保护的地方去，好吗?”

The flying carpet travelled so fast that next minute they were in Zimbabwe.

飞毯飞行得如此之快，以至于一转眼他们就来到了津巴布韦。

Daisy turned around and found that she was being watched by an elephant.

戴茜转过身去，看到一头大象正在望着她。

“Have you come to take my photo?”it asked.

大象问道：“你是来给我拍照的吗?”

In relief Daisy burst into laughter.

戴茜如释重负，突然笑了起来。

“Don’t laugh,” said the elephant, “We used to be an endangered species.

“不要笑了，”大象说道，“我们过去是濒危动物。

Farmers hunted us without mercy.

农民们总是惨无人道地捕杀我们。

They said we destroyed their farms,

他们说，我们破坏了他们的农田。

and money from tourists only went to the large tour companies.

而旅游者的钱过去都流进了大型旅游公司。

So the government decided to help.

于是政府决定出面提供帮助。

They allowed tourists to hunt only a certain number of animals if they paid the farmers.

如果游客付给农民钱的话，他们允许游客来猎取一定数量的猎物。

Now the farmers are happy and our numbers are increasing.

如今农民高兴了，我们的数量也在增加。

So good things are being done here to save local wildlife.”

因此为了拯救当地的野生动植物，他们也在做一些好事。”

Daisy smiled. “That’s good news.

戴茜笑道：“这可是个好消息。

It shows the importance of wildlife protection,

这体现了野生动植物保护的重要性。

but I’d like to help as the WWF suggests.”

不过，我还是想按照世界自然基金会(WWF)的建议来帮助你们。”

The carpet rose again and almost at once they were in a thick rainforest.

飞毯再次升起，几乎一转眼他们就到了茂密的热带雨林。

A monkey watched them as it rubbed itself.

一只猴子一边擦着身体一边望着他们。

“What are you doing?”asked Daisy.

戴茜问它：“你在干什么呢?”

“I’m protecting myself from mosquitoes,” it replied.

它回答说：“我这样做可以防止蚊虫叮咬。

“When I find a millipede insect, I rub it over my body.

当我发现一种千足虫，便把它擦在身上。

It contains a powerful drug which affects mosquitoes.

它含有一种较强的药物可以防止蚊虫叮咬。

You should pay more attention to the rainforest where I live and appreciate how the animals live together.

你们应该多加关注我生活的热带雨林，并且懂得热带雨林的动物是如何在一起生活的。

No rainforest, no animals, no drugs.”

没有雨林，就没有动物，也就没有药物了。”

Daisy was amazed.

戴茜很惊讶。

“Flying carpet, please take me home so I can tell WWF and we can begin producing this new drug.

“飞毯，请带我回家去，我可以告诉世界自然基金会，我们可以开始生产这种新药。

Monkey, please come and help.” The monkey agreed.

猴子，请跟我回去帮忙吧。”猴子同意了。

The carpet flew home.

飞毯飞回了家。

As they landed, things began to disappear.

当他们着地时，一切就开始消失了。

Two minutes later everything had gone—the monkey, too.

两分钟后，什么都没了——猴子也没了。

So Daisy was not able to make her new drug.

这样戴茜就不能制造新药了。

But what an experience! She had learned so much!

但是，这是一次多么奇妙的经历呀!她学了那么多东西!

And there was always WWF…

而且，还有世界自然基金会呢……

Animal extinction

动物灭绝

Many animals have disappeared during the long history of the earth.

自地球有史以来的这段漫长时期，许多动物都消失了。

The most famous of these animals are dinosaurs.

这些动物中最有名的是恐龙。

They lived on the earth tens of millions of years ago,

千百万年前，恐龙就在地球上生活，

long before humans came into being and their future seemed secure at that time.

比人类的出现要早得多，当时他们的前景好像也很安全。

There were many different kinds of dinosaur and a number of then used to live in China.

当时有许多不同种类的恐龙，其中有很多种类曾经生活在中国。

The eggs of twenty-five species have been found in Xixia County, Nanyang, Henan Province.

在河南省南阳西峡县发现了25个种类的恐龙蛋。

Not long ago a rare new species of bird-like dinosaurs was discovered in Chaoyang County, Liaoning Province.

不久前，在辽宁省的朝阳县新发现了一种罕见的、形状像鸟一样的恐龙。

When scientists inspected the bones, they were surprised to find that these dinosaurs could not only run like the others but also climb trees.

科学家们观察它们的骨头时，惊奇地发现它们不仅跟其他恐龙一样可以跑，而且还可以爬树。

They learned this from the way the bones were joined together.

科学家们是根据恐龙骨骼的连接方式得知的这些。

Dinosaurs died out suddenly about 65million years ago.

恐龙大约在6500万年前就灭绝了。

Some scientists think it came after an unexpected incident

有些科学家认为恐龙灭绝是发生在一件意外事故之后，

when a huge rock from space hit the earth and put too much dust into the air.

当时宇宙间一块巨石击中地球因而在空气中扬起太多的灰尘。

Others think the earth got too hot for the dinosaurs to live on any more.

另外一些科学家则认为，地球变得太热，因此恐龙无法在地球上生活了。

Nobody knows for sure why and how dinosaurs disappeared from the earth in such a short time.

没有人确切地知道恐龙是由于什么原因，又是怎样在这么短的时间里从地球上消失的。

We know many other wild plants, animals, insects and birds have died out more recently.

我们知道，近来许多其他的野生动植物、昆虫和鸟类也灭绝了。

According to a UN report, some 844 animals and plants have disappeared in the last 500 years.

根据联合国的一份报道，在过去5里，有844种动植物消失。

The dodo is one of them.

渡渡鸟就是其中的一种。

It lived on the Island of Mauritius and was a very friendly animal.

它生活在毛里求斯岛上，是一种非常友好的动物。

Please listen to a short story of the dodo and how it disappeared from the earth.

请听一个关于渡渡鸟的故事，看看它是如何从地球上消失的。

篇2：英语必修二unit4教案

教学目标

Goal For Knowledge

1. Get the students to learn the useful new words and expressions in bold in this part: ancient, compete, medal, volunteer, Greece, homeland, regular, basis, athlete, admit, slave, nowadays, gymnastics, stadium, gymnasium, host, responsibility, replace, swift, motto, take part in, stand f or, as well

2. Let students learn about the basic knowledge on the Olympic Games.

Goal For Ability

1. Develop the students’ reading ability and let them learn different reading skills.

2. Enable the students to learn to talk about the Olympic Games.

Goal On Emotion

1. Arouse the students’ great interest in the Olympic Games.

2. Develop the students’ sense of cooperative learning.

教学重难点

Key Points about the Class

1. Let the students learn more about the basic knowledge on the Olympic Games.

2. Get the students to learn different reading skills.

Difficult Points about the Class

1. Develop the stu dents’ reading ability.

2, Enable the students to learn to tal k about the Olympic Games.

3. Let the students learn to use comparing and contrasting when writing.

教学过程

Process of the Class

Step 1 lead in

1. Introduction

As we know, the ancient Olympic Games took place in Olympia in Greece every four years between 776BC and 339BC. Only men and boys could compete in the ancient Olympic Games. Married women were not even allowed to watch the Games; only young girls, boys and men could watch.

However, in modern times, there are two main sets of Games—the Summer and Winter Olympics, and both are held every four years. Athletes from any country who have reached the agreed standard for their event will be admitted as competitors. Therefore, there are many significant differences between the modern and ancient Olympics, although certain similarities exist.

In this text, Pausanias, an ancient Greek writer, has come on a magical journey to find out more about the ancient and modern Olympics. Has he got what he wants to know? I think you have got the answer. OK. First, let’s do a survey about Olympics.

Reflection:

This part is to introduce the students to the text briefly to make the text easy for them to read.

6. How many main kinds of the Olympic Games are there in the world?

7. What is the motto of the Olympic Games?

8. What is the host city of the first Olympics?

9. What is the host city of the Olympics?

10. What is the host city of the Olympics?

Suggested keys:

1-5 CBCDC

6. Two. They are the Summer Olympic Games and the Winter Olympic Games.

7. Higher, swifter and stronger.

8. Athens, Greece.

9. Athens, Greece.

10. Beijing, China.

Reflection:

This part is to arouse the interests of the students on Olympic Games and get them into the reading slowly.

Step 2 Pre-reading

Ask the students to look at the title of the text and the pictures in it and talk about them.

1) Title—An Interview

An interview is a meeting in which someone is asking another one some questions in order to find out about their actions or opinions.

2) The first picture in the text

The first picture is the statue of a great Greek. His name is Pausanias. He was a famous traveler and writer in the second century AD.

3) The second picture in the text

The second picture is a Chinese athlete named Yang Yang. She won a gold medal for China at the Winter Olympic Games. She is a famous skating player.

4) The third picture in the text

The third picture is the opening ceremony of the Olympic Games. Maybe this is the main stadium. It’s large and can hold thousands of audience. See in the sky the five white rings? They are the Olympic Five Rings which stand for the five continents—Asia, Africa, the Americas, Europe and Oceania.

Reflection:

This step is to help the students make a further understanding of the text.

Step 3 Reading

Comprehending

1 . Reading for the main idea

What does the passage mainly tell about?

Suggested answers: 1)–5) BBACC

Reflection:

This part is to check if the students have truly understood the text.

3. Read the passage carefully and answer the following questions.

1) What amazes Pausanias about the Olympic Games?

2) Why does he think Athens and Beijing should feel proud?

Keys:

1) Pausanias is amazed that many countries take part in the Olympics and women too and there are two sets of Olympics.

2) It’s a great honour to host the Olympics.

Reflection:

This part is to enable the students to have a deep understanding of the text by answering some difficult questions.

Keys:

1. one 2. women; slaves 3. Greece 4. two 5. reached; agreed standard

6. anywhere in the world

Reflection:

This part is to strengthen the key content in the text.

5. Summary writing 归纳写作

Answer these questions in not more than 100 words.

回答下列问题，将答案组成一个段落，不要超过100个单词。

1. Who is Pausanias?

2. Why has Pausanias come to our time?

3. Who tells Pausanias about the Modern Olympic Games?

4. How often are the Modern Olympics held?

5. How many sets of Games are there for the Modern Olympics and what are they?

6. Who can take part in the Modern Olympic Games?

7. How many sports are there in the Modern Olympics?

8. Where do the athletes live during the Olympics?

9. Who wants to host the Modern Olympics and why?

10. What are the mottos of the Olympics?

Keys:

1. Pausanias is a Greek writer about years ago.

2. He has come to our time to find out about the Modern Olympic Games.

3. Li Yan tells him about it.

4. The Modern Olympics are held every four years

5. There are two sets of Games for the Modern Olympics. They are the Summer and the Winter Olympics.

6. Athletes who have reached the agreed standard can take part.

7. There are over 250 sports in the Modern Olympics.

8. The athletes live in a special village during the Olympics.

9. Any country wants to host the Olympic Games because it is a great honour to host it.

10. The mottos of the Olympics are Swifter, Higher, Stronger.

Passage making

Reflection: This exercise is to improve the students’ ability of analyzing and writing.

6. Discuss this question in groups: why do many countries want to host the Olympic Games while others do not? Put forward your ideas and give reasons for your choices.

Reasons to host the Olympic Games

1. a great honour

2. great responsibility

3. more buildings will be put up

4. feeling proud for one’s country

5. new sports stadiums will be built

6. more visitors will come

Reasons not to host the Olympic Games

1. too expensive

2. much planning

3. pressure and stress

4. accommodation

5. too many stadiums

6. accidents / attacks

Your ideas

Reflection:

This part is to improve the students’ abilities of summing up and analyzing.

7. An Interview Activity

Let’s invite some of the students to act as Pausanias and Li Yan to make an interview. Ok, who likes to act as Li Yan? And who wants to act as Pausanias? Welcome here. (to the one who acts as Pausanias) Hello, Pausanias, very glad to meet you! Welcome to our time on a long journey from your time! You must be tired, aren’t you? What have you come here for? Why have you been here? Ok, let me introduce my friend, Li Yan, who is a volunteer for the 2008 Olympic Games. (to Li Yan) Li Yan, this is Pausanias, a great Greek writer, who wants to ask you some questions. Pausanias, you can ask Li Yan any questions you like. Go ahead.

Pausanias:

Li Yan:

Reflection: This part is to display the students’ ability of performance.

Step 4 Post-reading (summary of the whole text)

1. Finish the mind map to have a summary of the text.

Keys:

1. Every four years. 2. Two. 3. 250. 4. Anyone who reaches the agreed standard. 5. Any country.

6. Swifter, higher and stronger.

Reflection:

This part is to ask the students to summarize the key content in this class.

2. Fill in the blanks according to the text.

Pausanias and Li Yan are talking about the similarities and 1________(different) between the ancient and modern Olympics. The ancient Olympic Games were first held in Athens, in 2________ only men from Greece had the right/honour 3__________(compete). The champions were awarded olive wreaths as prizes. The modern Olympics 4________(start) in 1896. From then on, athletes from all over the world have come to take part 5________ the Games every four years. There are two sets of Games—the Summer and the Winter Olympics. Anyone who has reached the agreed standard for their event will be 6________(admit) as competitors. There are over 250 events. To host all the competitors, a special village is usually built, with a stadium, a very large swimming pool, a gymnasium as well as seats for those who watch the 7________(game). The winners of the first three places are awarded gold, silver and bronze medals. The motto of the Olympic Games is: 8________(swift), Higher and Stronger.

附：

Text,vocabulary and sentence structure

An Interview

Pausanias, who was a Greek writer about 2,000 years ago, has come on a magical journey on March 18th, to find out about the present-day Olympic Games. He is now interviewing LiYan, a volunteer for the 2008Olympic Games.

P: My name is Pausanias. I live in what youcall “Ancient Greece” and I used to write about the Olympic Games a long timeago. I’ve come to your time to findout about the present-day Olympic Games because I know that in 2004 they wereheld in my homeland. May I ask yousome questions about the modern Olympics?

L: Good heavens! Have you really come from solong ago? But of course you can ask any questions you like. What would you liketo know?

P: How often do you hold your Games?

L: Every four years. There are two main setsof Games—the Winter and the Summer Olympics, and both are held every four yearson a regular basis. The WinterOlympics are usually held two years before the Summer Games. Only athletes who have reached the agreedstandard for their event will be admittedas competitors. They may come fromanywhere in the world.

P: Winter Games? How can the runners enjoy competing in winter? And what abouthorses?

L: Oh no! There are no running races or horseriding events. Instead there are competitionslike skiing and ice skating which need snow and ice. That’s why they’re calledthe Winter Olympics. It’s in the Summer Olympics that you have the runningraces, together with swimming, sailing and all the team sports.

P: I see. Earlier you said that athletes areinvited from all over the world. Do you mean the Greek world? Our Greek citiesused to compete against each other just for the honour of winning. No othercountries could join in, nor could slavesor women!

L: Nowadaysany country can take part if their athletes are good enough. There are over 250sports and each one has its own standard. Women are not only allowed, but playa very important role in gymnastics,athletics, team sports and …

P:Please wait a minute! Allthose events, all those countries and even women taking part! Where are all theathletes housed?

L:For each Olympics, aspecial village is built for them to live in, a main reception building,several stadiums for competitions,and a gymnasium as well.

P: That sounds very expensive. Does anyonewant to host the Olympic Games?

L: As a matter of fact, every county wantsthe opportunity. It’s a great responsibilitybut also a great honour to be chosen. There’s as much competition amongcountries to host the Olympics as to win Olympic medals. The 2008 Olympics willbe held in Beijing,China. Did you know that?

P: Oh yes! You must be very proud.

L:Certainly. And after thatthe Olympics will be held in London.They have already started planning for it. A new village for the athletes andall the stadiums will be built to the east of London. New medals will be designed of course and …

P: Did you say medals? So even the olivewreath has been replaced. Oh dear!Do you compete for prize money too?

L: No, we don’t. It’s still all about beingable to run faster, jump higher and throw further. That’s the motto of the OLympics, you know—“Swifter, Higher and Stronger.”

P:Well, that’s good news.How interesting! Thank you so much for your time.

Vocabulary

1.Greecen. 希腊 Greek adj. 希腊(人)的;希腊语的;n.希腊人;希腊语

2. magical adj. 魔术的;有魔力的

3. present-day adj. = modern目前的; 现代的

4. volunteer n. a person who does somethingwithout being paid 志愿者

5. ancient adj. very old; living in oldtimes 古代的;古老的

6. homeland n. motherland 祖国;本国

7. hold v. host 举办;主持

8. a set of 一套;一组 a setof stamps 一套邮票

9. regular adj. 规则的;定期的 regularly adv. 定期地irregular adj. 不规则的;不定期的

10. basis n. (pl bases) 基础;根据on a regular basis 按照常规

11. athlete n. 运动员;运动选手 athletics n. (pl) 体育运动;竞技

12. agreed standard 规定标准;资格

13. admit v. to allow sb. to be a member ofan organization 容许;承认;接纳

be admitted as … 被允许成为…

14. compete v. 比赛;竞争 compete in 在…比赛;参与…竞争 compete for 为…而比赛

competitor n. 竞争者 competition n. 比赛;竞争 competitive adj. 竞赛性的

15. slave n. 奴隶 slaveowner 奴隶主 slavery n. 奴隶制

16. nowadays adv. = at present 现今;现在

17. gymnastics n. (pl) 体操;体能训练

18. gymnasium n. = gym 体育馆;健身房

19. stadium n. (pl stadiums or stadia) 露天大型体育场

20. a reception building = a building usedfor receiving guests 接待大楼 a reception room 接待室

21. as well = too 也;又

22. host v. = organize an event 做东;主办;招待

23. responsibility n. 责任;职责 responsible adj. 负责任的;有责任心的

24. medal n. 奖章;奖牌

25. olive n. 橄榄树;橄榄叶

26. wreath n. 花冠;花圈

27. replace v. take the place of 取代;替换;代替

28. motto n. 格言;座右铭

29. swift adj. fast 快的;迅速的

Sentencestructure

1. He is now interviewing Li Yan, a volunteer for the 2008 Olympic Games.

划线部分是Li Yan的同位语，用来补充说明Li Yan的情况。也可以将其转化为非限制性定语从句 who is a volunteer for the 2008 Olympic Games. 反之也然。如，Pausanias, who was a Greek writer about 2,000 yearsago, has come on a magical journey on March 18th, 2007 to findout about the present-day Olympic Games. 可以将who was去掉，把非限制性定语从句改为同位语。

2. I live in what you call “Ancient Greece” and I used to write about the Olympic Games a long timeago. 我生活在你们叫“古希腊”的地方。我很久以前是写奥运报到的。

划线部分是宾语从句，作介词in的宾语。

3. That’s why they’re called the WinterOlympics. 这就是它们为什么被叫作冬奥会的原因。

划线部分是表语从句，前面is是系动词。

4. It’s in the Summer Olympics that youhave the running races, together with swimming, sailing and all the teamsports. 就是在夏季奥运会上你才会看到跑步比赛，游泳，帆船和其它集体项目。划线部分是强调句。结构是 It is/ was +被强调部分+that+其余部分。被强调部分是表示人的名词也可以用who来代替that。如，The building was built 100 years ago. 强调主语 It was the building that was built 100 years ago. 强调时间状语 It was 100 years ago that the building was built.

5. Our Greek cities used to compete againsteach other just for the honour of winning. 在我们希腊，城市之间过去经常为荣誉而比赛。

used to do sth. 过去常常做某事。beused to do sth. 被用来做某事。be used to doing sth.习惯于做某事。

6. No other countries could join in, norcould slaves or women! 其它国家不能参加，奴隶和妇女也不能!

划线部分是倒装句，表示前面否定的情况也适合后面。结构是nor/neither+be/助动词/情态动词+主语。肯定句用so引导。

7. There’s as much competition among countries tohost the Olympics as to win Olympic medals. 国与国之间争取奥运会承办权的竞争就跟争夺奥运奖牌一样激烈。

as +形容词或副词原级+ as或者as + much/many +名词+as 是同级比较的句型，意思是“和…一样的”

如，He ate as much rice as I did. It’s generally believed that teaching is asmuch an art as it is a science. 人们普遍认为教学既是一门科学，也是一门艺术。I have as many friends as my brother does.

Reflection:

Thispart is to make it convenient for the students to complete the learning planwith the help of vocabulary and structure, especially to the common cla

课后习题

Homework

Why do many countries want to host the Olympic Games while others do not? Put forward your ideas and give reasons for your choices and then write a passage.

英语必修二unit4教案

篇3：生物必修二说课稿

生物必修二说课稿

一、说教材

1．教材地位和作用

《DNA的复制》这一部分内容也是第三章的重点内容之一。它既是对前面已学习的孟德尔遗传定律和减数分裂知识进一步的深化理解，也是整个遗传的基础。

2．教学目标

（1）知识目标：概述DNA分子的复制；探讨DNA复制的生物学意义

（2）能力目标：培养学生自学能力，观察能力、分析理解能力

（3）德育目标：激发学生学科学、用科学、爱科学的求知欲

3．教学重点、难点

（1）教学重点：DNA复制的条件、过程及特点。

（2）教学难点：DNA复制的过程，特别是半保留复制。

4．教材处理及课时安排

根据教材的重难点以及学生的实际情况，本节内容只安排一个课时。教学顺序是“推测－实验证据－复制过程” 进行。

二、说学法：

学生应通过观察、分析、讨论与教师讲授相结合来学习本课内容

三、说教法：

充分利用多媒体的功能，把DNA复制过程编制成动态过程，使难点知识变静为动、变抽像为形象，转化为易于吸收的知识。并指导学生进行讨论交流，通过提高学生的识图能力、思维能力，且适当配合练习，将知识化难为易。

四、说具体的教学过程

关于DNA分子的复制的教学，教师首先可以通过课题下的，2008北京奥运会的'会

幑“中国印·舞动的北京”导及问题探讨，激起学生和兴趣。然后让学生回顾以前学过的有

关有丝分裂和减数分裂过程中DNA复制的时间。接下来设置问题：“DNA是如何复制的”？

让学生积极讨论。然后才引出沃森和克里克对DNA复制过程的推测，从而得出DNA 的半

保留复制过程。

其次，指导学生阅读课本，充分利用课本的彩图来分析、学习科学家对DNA复制过程所做的经典实验，通过这个实验使学生掌握科学研究的思想，领悟科学探究的魅力，也掌握一种生物学实验常用的方法－放射性同位素标记法，分析用CsCL密度梯度离心后重带、中带、轻带表示的DNA分子的双链构成怎样的，在整个实验亲代、子一代、子二代细胞中提取出的DNA离心结果说明了什么。通过层层分析，学生不仅能够自已得出结论，同时也训练了学生的逻辑思维能力和进一步明确了什么是半保留复制。从而也得出了DNA复制的定义。最后，引导学生学习课本第54页，提出相关问题：

⑴什么是解旋：解旋的目的是什么？

⑵什么叫子链？复制一次能形成几条子链？

⑶简述子链形成过程？

让学生充分回答上述问题后，教师播放多媒体DNA分子复制过程的动态图解。归纳出复制三点过程：①解旋提供准确模板②合成互补子链③子、母链结合盘绕形成新DNA分子。

以上过程可配合板图进行归纳。通过这个过程得出DNA复制的特点：

（一）DNA分子是边解旋边复制的，是一种半保留复制，即在子代双链中，有一条是亲代原有的链，另一条则是新合成的。

（二）DNA复制严格遵守碱基互补配对原则准确复制，从而保证了子代和亲代具有相同的遗传性状。

设问：DNA复制后两个子代DNA分子与亲代DNA分子是否完全相同？为什么？

通过设问，让学生进一步理解和巩固DNA复制的全过程。接下来让学生总结出DNA复制的四大基本条件：① 模板：开始解旋的DNA分子的两条单链；

② 原料：是游离在核液中的脱氧核苷酸；

③ 能量：是通过水解ATP提供；

④ 酶：酶是指一个酶系统，不仅仅是指一种解旋酶。

最后通过以上分析，总结出DNA复制的意义以及在生活中的应用：

意义：DNA通过复制，使遗传信息从亲代传给子代，从而保证了物种的相对稳定性，保持了遗传信息的连续性，使物种得以延续。

应用：目前DNA分子广泛应用于刑事案件侦破等方面：

如：DNA分子是亲子鉴定的主要证据之一。把案犯在现场留下的毛发、血等进行分析作为破案的证据，与DNA有关。

篇4：高中物理必修二说课稿

各位评委、老师：

我今天说课的内容是高中物理必修第二册第七章第二节“功”，下面我将从教材、教法和学法、教学过程以及板书设计四个方面对本课进行说明。

一、说教材

“功”这一节在力学中占有很重要的位置，它的地位具有双重性。其一，它属于初高中知识的结合点：我们应该以初中知识为起点，以教材内容为线索，展开科学方法教育与思维能力培养；其二，它属于能量和力的结合点：阐明了能量和力的关系，是进一步学习能量部分以及解决力学问题的理论基础，结合本课特点，我将本课的教学目标确定为：

1知识与技能：

理解功的概念，做功的要素，功的计算公式以及能够理解正负功的意义，并要求会用两种方法求多个力做功。

2过程与方法：

培养学生的推理能力、分析综合能力，并学会物理学常用的通过特殊性得出普遍性的研究方法，进而学会对各种问题的分析解决。

3情感态度价值观：

通过课前的活动，激发学生团结协作的精神和爱科学学科学的热情。

二、说教法和学法

科学合理的教学方法能使教学效果事半功倍，达到教与学的和谐完美统一。基于此，我准备采用的教法是讲授法，点拨法。通过讲授法，教师可以系统地传授知识，充分发挥教师的主导作用。

学法上，我贯彻的指导思想是把“学习的主动权还给学生”，倡导“自主、合作、探究”的学习方式，具体的学法是阅读法、讨论法，让学生养成自主学习的良好习惯。

三、说教学过程

由于本节课教学是概念课，分析、推理成份居多，所以依据新课程的要求，在本节教学中，教师利用多媒体电脑提出问题，引导学生分析问题，学生通过自己的分析、推理，总结得出结论。这样把学生从被动学习转化为主动学习，充分体现了“学生主体、教学主导”的教学模式。为了完成教学目标，课堂教学我准备按以下五个环节展开。

环节1新课引入：

由唐朝诗人李白的诗《望庐山瀑布》中瀑布下落过程中重力势能和动能的相互转化现象，引出功的概念，然后结合教材中的三幅图片，请同学们思考图片中都有什么形式的能量发生了相互转化，同时在能量的转化过程中有什么共性，归纳出做功的两个必要因素，即力的作用和物体在力的方向上发生的位移，由两个必要因素总结出做功其实就是力对物体在空间上的积累效果，使同学们更好的理解了功的概念。这样引入功的概念，兼顾到了学科间的综合。从教学心理角度来看，这种讲法有助于消除学生因学习新课带来的懈怠感。同时提醒学生注意几点：谈到做功要明确是什么力做功？对什么物体做功？在什么过程做功？

环节2讲解功的计算公式：

通过复习初中已学过的知识基础上提出问题，力的方向跟运动方向成某一夹角α时，做功应如何计算？这样设问可以调动学生探索问题的积极性，完全符合新课程标准的理念。启发学生通过分析、推理得出W=Flcosα教材上的方法是采取力的分解。在教学中为了活跃学生的思路，还可以介绍另一种方法，即把位移l分解，同样可以得出W=Flcosα，不要小看这短短一笔，它能更好的开阔学生思路，正是体现素质教育的好素材。在公式中，F—力的大小，l—位移的大小，α—力的方向和位移方向的夹角。由于公式中都是数值的乘积，所以可以直接得出功是标量。功的单位：焦耳。公式其实也不是普遍适用的，它只适用于恒力做功，这一点教材上没有提及，但是在教学过程中应该向学生简单介绍，针对变力做功今后要开专题讲解。在讨论公式时引导学生从数学的角度去思考cosα可能取到的值，让学生自己来总结力对物体做功的三种形式，作为教师只要注意更好的点拨正负功的意义，重在让学生理解透彻就可以了，这样做可以大大的提升学生自主学习的能力。同时也体现了教师的主导作用和学生的主体活动的和谐统一。

环节3多个力做功的求法

以教材例题为例讲解第一种方法，而第二种方法就让学生自主探究，借此机会可以让学生自己复习一下合力的求法，然后由老师给出结论。

环节4本章小结

最后让学生以抢答的方式总结本节课的重点知识内容，调动学生的积极性，增强学生记忆的深度。

环节5习题设计和作业布置

物理学科讲究学以致用，所以针对本节课的教学内容安排一些适当难度的课上习题。然后布置一些开放性的课后作业，让学生课后查阅资料解释生活周围做功伴随能量转化的`现象，这样既激发了学生的学习热情，又可以培养学生学习物理的研究式学习习惯。

四、说板书设计

好的板书就像一份微型教案，理清文章脉络，突出重点难点，我的板书力图全面而简明的将授课内容传递给学生，清晰直观，便于学生理解和记忆，达到提纲挈领的效果。

为了更好的体现新课程，本节课我将学生分成两组，在相互竞争中去完成本节课的学习，体现了教师的主导作用和学生的主体活动的和谐统一，教法和学法的和谐统一，知识传授和智能开发的和谐统一，德育和智育的和谐统一。从而达到更好的教学效果。以上说课定有不当之处，恳请评委老师批评指正，谢谢大家。

篇5：高中物理必修二说课稿

高中物理必修二说课稿

各位评委、老师大家好：

我今天说课的内容是高中物理必修第二册第七章第二节“功”，下面我将从教材、教法和学法、教学过程以及板书设计四个方面对本课进行说明。

一、说教材

1.知识与技能：

理解功的概念，做功的要素，功的计算公式以及能够理解正负功的意义，并要求会用两种方法求多个力做功。

2.过程与方法：

培养学生的推理能力、分析综合能力，并学会物理学常用的通过特殊性得出普遍性的研究方法，进而学会对各种问题的分析解决。

3.情感态度价值观：

通过课前的活动，激发学生团结协作的精神和爱科学学科学的热情。

二、说教法和学法

三、说教学过程

环节1.新课引入：

环节2.讲解功的计算公式：

通过复习初中已学过的知识基础上提出问题，力的方向跟运动方向成某一夹角α时，做功应如何计算？这样设问可以调动学生探索问题的积极性，完全符合新课程标准的理念。启发学生通过分析、推理得出W=F l cosα.教材上的方法是采取力的分解。在教学中为了活跃学生的思路，还可以介绍另一种方法，即把位移 l 分解，同样可以得出W=F l cosα，不要小看这短短一笔，它能更好的开阔学生思路，正是体现素质教育的好素材。在公式中，F—力的大小，l—位移的大小，α—力的方向和位移方向的夹角。由于公式中都是数值的乘积，所以可以直接得出功是标量。功的单位：焦耳。公式其实也不是普遍适用的，它只适用于恒力做功，这一点教材上没有提及，但是在教学过程中应该向学生简单介绍，针对变力做功今后要开专题讲解。在讨论公式时引导学生从数学的角度去思考cosα可能取到的值，让学生自己来总结力对物体做功的三种形式，作为教师只要注意更好的点拨正负功的意义，重在让学生理解透彻就可以了，这样做可以大大的提升学生自主学习的能力。同时也体现了教师的主导作用和学生的主体活动的和谐统一。

环节3.多个力做功的求法

以教材例题为例讲解第一种方法，而第二种方法就让学生自主探究，借此机会可以让学生自己复习一下合力的求法，然后由老师给出结论。

环节4.本章小结

最后让学生以抢答的方式总结本节课的.重点知识内容，调动学生的积极性，增强学生记忆的深度。

环节5.习题设计和作业布置

物理学科讲究学以致用，所以针对本节课的教学内容安排一些适当难度的课上习题。然后布置一些开放性的课后作业，让学生课后查阅资料解释生活周围做功伴随能量转化的现象，这样既激发了学生的学习热情，又可以培养学生学习物理的研究式学习习惯。

四、说板书设计

篇6：英语必修说课稿

Gd rning,everne! I' ver glad t vice idea f the text 'The Future f Cberspace'. I'll tal abut it in three aspects.

First ,the teaching aterial.

This text is the first part f Unit 4 Mdul 2 b Beiing Teachers' Universit Publishing Huse. The headline is 'Trr5

篇7：英语必修说课稿

大家上午好，今天我要向大家介绍的课是普通高中课程标准实验教科书英语必修2第4单元Wildlif Protection 阅读部分 How Daisy Learned to Protect Wildlife。我将着重从以下五个方面介绍我的课：教材分析和学情分析、教学目标及重难点、教学方法，教学步骤和板书设计。

首先，我想分析一下教材和学生情况，我所要讲的课是本单元的第一部分，也就是warming up 和阅读部分。本单元的话题是保护野生动物的重要性以及如何保护野生动物和濒临灭绝的动物。学生对动物保护非常的感兴趣，所以在提到野生动物以及保护措施时都有自己独特的理解和见解。我的学生来自高中一年级，他们大都能够用一些简单的句子表达自己的观点，学习英语热情高，喜欢表达自己的想法。所以我会尽量设计一些小组讨论及口头表达活动，给他们足够的空间练习口语。但是他们阅读能力还比较弱，没有掌握好阅读技巧，尤其还不会运用读前预测，跳读，精读等阅读技巧理解课文。本节课我将着重教授阅读技巧如读前预测、跳读、精读等。

根据以上对教材和学生情况的分析，我制定以下教学目标和本课重难点。第一、语言知识，学生在warming up 和pre-reading时尽量能够掌握本单元重点单词和短语。第二、语言技能，本课主要是以阅读为主，所以学生要学习和掌握扫读，跳读，精读等阅读技巧。第三、情感目标，学生知道保护野生动物和濒危动物的重要性，以及通过自己的实际行动保护小动物。第四、文化意识，学生了解保护野生动物不是一个人，一个地区或是一个国家的事情，而是全人类共同的责任。了解世界上野生动物保护组织，如WWF。第五，学习策略，学生能够独立思考以及通过小组合作学习。而本课的重点是学生能够自由发表保护野生动物的建议，能够形成保护野生动物的意识。阅读技巧的掌握是即是本课的重点也是本课的难点。

我采用的教学方法主要是交际法。

接下来，是关键的环节——教学步骤，我把整个教学过程分为五个步骤：warming up，pre-reading，while-reading，post-reading和homework。

步骤一、warming up（5m）

我首先播放一个视频，视频的内容是野生动物如何面临死亡、灭绝的。通过视频引发学生对野生动物为什么越来越少的思考，学生根据短片和自身了解给出多种野生动物濒临灭绝的原因。这之后，我会说，现在越来越多的人和国家都意识到这个问题的严重性，很多保护野生动物的组织逐渐形成，如WWF（介绍这组织的）。我会让学生翻开课本的27页，这里有对WWF具体的介绍。

在这个环节中，引入本文主题，学生能够熟悉本文的重要话题——野生动物保护，以及了解重要的世界野生动物保护组织。他们形成保护野生动物的意识。

步骤二、pre-reading（5m）

这里我要求学生根据文章的题目How Daisy Learned to Protect Wildlife及在热身环节的`讨论过的话题，预测一下文章将要讲述什么样的内容。通过这个活动，学生能够学习如何通过文章的标题找到跟文章内容相关的信息，并能掌握预测技巧运用到实际阅读中。

步骤三、while-reading（25m）

While-reading是正文部分，将花费25分钟。首先，我会给出文章中各个自然段的中心意思，是打乱循序的。要求学生跳读文章各段给各个自然段找到正确的中心意思。学生能够运用跳读技巧找出各段体现主题的词语和句子，选出各段的中心意思。其次，我要求学生根据我设计表格来精读文章，表格是关于Daisy三次拜访野生动物的经历，包括野生动物的生存条件和野生动物未受保护和受保护的不同结果。学生认真的阅读课文，阅读后，学生四人为一小组根据自己对文章的了解进行讨论，最终得出小组答案，我会让小组代表说说该组的最终答案。在这个环节中，学生能够通过精读找到文章中的细节内容，这些细节内容都体现文章的话题，是对文章话题的具体表现。有助于学生跟好的理解话题。同时学生间小组讨论合作有利于学习互补。根据以上对各个段落的中心意思的总结及Daisy三次野生动物拜访的总结，学生可以根据已知的信息很容易的总结出本文的主旨。为了能够及时巩固已学的知识，接着，我要求学生能够根据各个段落的中心意思及Daisy三次野生动物拜访的总结复述课文。

步骤四、post-reading(8m)

我要求学生分小组自由讨论如何保护野生动物的对策，比赛哪组是“献计王”。学生通过激烈地讨论，集思广益。那组的对策最多最妙为赢家将得到“献计王”的称号。

步骤五、homework（2m）

在文中找到表达建议的语句。

上网搜索保护野生动物的对策，并能用建议性的语句给WWF写三条保护野生动物的建议。还要上网多了解一些世界保护野生动物的组织。写三条保护野生动物的建议是为了下节课写作做准备。

板书如下：

Unit 4 How Daisy Learned to Protect Wildlife

Paragraph(main idea ) Animal Situation Result

Para.1 Tibet Antelope Be hunted Numbers are descreasing

Para.2 … … …

Para.3/4 … …. ….

carpet

fur

distant

mercy

certain

burst into laughter

in relief

…

篇8：二年级下册英语Unit4说课稿

一、说教材

教学内容：

牛津小学英语2B Unit4 My toys A、B版块。

教学目标：

(1)能听懂、会说、初步认读doll，puzzle，yo-yo和puppet四个玩具类单词，发音正确。

(2)能听懂会说特殊疑问句What do you have?及其回答I have…

(3)会用英语向别人介绍自己的玩具,学会与朋友分享自己的乐趣。

教学重难点：

(1)能听懂、会说、初步认读doll，puzzle，yo-yo和puppet，尤其puzzle和puppet，发音正确。

(2)能听懂会说特殊疑问句What do you have?及其回答I have…

教学准备：

一只装有玩具的包，四个不同颜色的小箱子，多媒体课件

二、说教法、学法

根据以上对教材的分析，我采用活动化教学法和情景创设法，以及多媒体辅助法来安排本课的教学。学生通过思考、讨论、交流、合作等方法，达到学习目标，完成学习任务。

三、说教学过程

Step1. warm-up

Sing a song.

Row, row, row your boat

Say a rhyme.

five little monkeys

Step2. Lead-in

Guessing game

引出课题my toys

Step3: Presentation:

1 T: What can you see?

S: I can see a doll.

T拿出实物，教授doll 以及I have a doll.

T：Do you like this doll?

S: Yes, I do.

T: Here you are.

S: Thank you.

T: What do you have?

S: I have a doll.

S&S :

What do you have?

I have a doll.

2. Say a chant:

What, what,

What do you have?

Doll, doll,

I have a doll.

3. The doll has a bag. What’s in the bag?

T 拿出实物包，里面装有一些玩具，其中包括yo-yo, puzzle和puppet,请两位学生一位问 What do you have? 一位来摸出玩具，并回答I have…

当摸出yo-yo, puzzle或puppet其中一个时，教师教授生词，注意puzzle和puppet读音。

此环节设置为小组竞赛的形式。

4. Go into the text

Watch the cartoon, then answer the question: What does Mike have?

Read after the tape.

Act out the dialogue with you partner.

Step4: Consolidation:

1. Magic eyes

2.Finding friends

Look, there are four boxes here. They are red, yellow, blue and green.

T：What do you like?

S: I like…(分别请四个学生抽选自己喜欢的盒子)

T：Now open our boxes. Look, I have a doll. What do you have?

S：I have a…

T: Who’s my friend? (教师与持有娃娃的学生击掌欢呼)

Step5. Practice1:

请用英语介绍自己最喜欢的玩具.

My toy

I have a toy car.

It’s yellow.

I like this yellow car.

And you?

Practice2:

A: Look, I have a …what do you have?

B: I have a …

A: What colour?

B: It’s…

A: Let’s go and play.

B : Ok!

Step6: Homework

1. 跟磁带朗读课文，单词。

2. 利用今天所学句型，调查你的朋友们有哪些玩具，完成表格。

篇9：二年级下册英语Unit4说课稿

Good afternoon everyone：

今天，我说课的内容是PEP教材BookⅡUnit4 B部分的Let’s talk。这部分教材的选用和设计都充分体现了语言的交际功能，突出语言教学的目的是为了应用，并运用语言来完成有实际目的的任务。

本课时的中心话题是“Can I have an apple , please ?”因为 A部分的Let’s talk已经教学了句型“Do you like pears ?”,给本课时的会话教学提供了铺垫。因此，本课时的功能主要是在此基础上，使学生能够根据自己的口味运用句型“Can I have …?”，表达自己想要什么水果的愿望，并能运用语言在实际情境中展开交际活动。

《英语新课程标准》是以学生的综合语言运用能力的发展水平为目标的，因此，我制定了这样的教学目标：

1、在会话中学习掌握新单词apple , bananas, strawberry , grages。

2、能听懂、会说Let’s talk部分的会话，并在生活实践情境中学习和运用句型“Can I have an apple , please ?”。

3、在情境中激发兴趣，培养大胆实践的精神;在交际中沟通情感，促进人际关系。

为了全面落实教学目标，我进行了以下的教学设计：

首先是Warm-up(热身)。

小学生生性好动，好奇心强。为了吸引他们的注意力，在Warm-up这个环节我准备了两个装有水果的箱子。

A箱中装有已学单词的水果(peach , orange , watermelon， pear)

B箱中装有要学单词的水果(apple , bananas, strawberry , grapes)

教师从A箱摸出一个水果，与一组学生合作，用句型“Do you like pears ?Yes , I do . /No , I don’t .”进行师生对话。

教师演示一个水果后，让学生在小组中自由开展对话。

等学生从A箱中摸出3、4个水果之后，教师可以将游戏引向B箱，这时，学生拿出水果，想说，但因为没学过，不会说，而遇到了困难，而这个困难适时地激发了学生想说，想学新单词的欲望，教师就可以利用这个机会在句型中渗透教学新单词(apple , bananas, strawberry , grapes)。

这个环节通过摸水果，激发了学生的学习兴趣，同时将教学过程过渡到第二个环节Presentation(新课导入)。

任务型语言教学是一种以任务为中心，以完成任务为目的的交际性教学模式。它主张创设一种接近实际生活的真实情境，让学生通过感知、体验、实践、参与和合作探究等活动方式学习和使用语言，培养学生语言实际运用的能力。

一开始，我就创设了这样一个情境：Look ! These children have a party at Miss White’s home . They are having fruits , now。以观看录像的形式，让学生整体感知对话，对即将学习的新句型有一个初步的印象。会话中的一部分句型在A部分的Let’s talk中已经教学过了，教学中可以截取其中一段录像，将重点句型反复多放几遍，让学生边看、边听、边说，领会句型大意。

接着，出示一些食物水果放在讲台上，对学生说：“Do you like fruits ? Do you want some fruits ?”，激起他们想要什么水果的欲望，再引导他们用句型“Can I have …?” “Certainly!”与教师进行交际。这样，做了一、两次示范以后，学生就能以Group Work的形式对这个句型进行交际训练。

英语是一种活动，通过活动让学生在情境中体验和参与交际的同时得到不同的.发展。因此，在设计Practise这个环节时，我力求满足不同类型不同层次学生的需求，使每一个学生的综合语言运用能力都得到发展：

首先，告诉学生：Fruits are so sweet ! And they are good to our healthy . There are many fruits in the English Supermarket . Let’s go to the Supermarket and have some fruits ! English Supermarket(英语超市)是我为了让学生的学习学以致用而创设的，根据每个单元教学内容的不同而设置相应的物品，本课时，我设置了水果、食物、饮料等物品，学生只要能够用本课时所学的句型进行表达，就能得到自己想要的物品。伴随着音乐，师生共同哼唱着歌曲《An Apple A Day》，与好友一起结伴共游English Supermarket。

由于学生语言水平存在着差异，到达English Supermarket之后，有教师加入的一组可以率先展开交际活动。如：“Do you like bananas ? Sorry , I don’t like bananas . ”“Can I have an apple , please ? Certainly!”等，给部分语言水平不高的学生作示范。对于这部分学生来说，他们的目标是能听懂教师这组的英语会话，并能模仿在自己小组开展交际活动。

但是部分语言水平较高的学生不用看示范也能自由组织语言进行交际。为了给这部分学生拓展语言提供发展的空间，我在超市的部分柜台上另外放置了一些食物、水果，引导他们联系实际，就地取材，自主组织语言，例如：“Do you like orange juice? Can I have some Coke , please? Can I have some French Fries , please? Certainly! Here you are .”等。这样就能使每个层次，每个类别的学生在下课的时候，都能这样说：“Learned this lesson , I feel get great gain .”

以上是我的说课，Thank you for your listening !