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Book3 Unit 4 Reading: How life began on the earth

教学设计

制作人：侯丽梅

本课的课程六要素

主题语境：人与自然(宇宙探索，环境保护) 语篇类型：scientific essay 语言知识：

语篇

（对语篇各部分围绕语篇主题以时间顺序展开要有清晰的认识）

Learn about the formation of the earth . Learn about the development of life on the earth . Learn about the problem of global warming . 语用

（运用恰当的衔接词和文中的描述词简洁表述地球形成及生命发展的过程，

表达对全球变暖问题的看法、态度和建意）

After the “big bang”/ Then

/ In time / As it cooled down / Then

The arrival of / Next / Later / When / After / About 2.6 million years ago To begin with / In addition / What’s more

/ Finally /

Last but not least form / appear / settle into / explode / produce / cool down / dissolve / prevent...from 语言技能：

看（能听懂本篇课文内容，图片信息，地球形成及生命发展过程图，捕捉关键信息）；

读（能读懂并理解每段的段落大意，理解本篇文章的时间线索和整体思路）

说

(能简单介绍地球形成及生命的进化过程，并能描述出地球现在所面临的全球变暖问题) ；

写（能按时间顺序描绘出地球及生命进化过程，并能简单写出全球变暖的现状、原因及应对方法）

学习策略：认知策略

情感策略

文化知识：

1.The students can understand the formation of the earth and the development of life on earth . Describe the evolution of life on the earth according to the timeline .

2. Realize the danger of global warming and discuss possible ways to prevent global warming. Do something to take good care of our earth. 1

体现核心素养: 本课活动

活动类型

核心素养

学习能力

思维品质

课前充分预习、上网或翻阅书籍查找地球起源（能简学习理解

单介绍盘古开天辟地、女娲造人、上帝创造世界的传自主学习

说及人们普遍接受的理论“宇宙大爆炸”），生命进化，全球变暖问题，保护地球举措及相关信息

仔细阅读文章，查找地球形成，生命进化历程并记录学习理解

关键信息，找到时间顺序的关键词

按时间顺序做出地球形成和生命进化图并向全班展示

应用实践

观看视频“生命的起源”，按时间顺序对生命的进化历迁移创新

程排序，并复述整个过程。

针对现象（全球变暖）--分析原因--提出对策

倡导关爱地球，保护我们生存的家园。

2

语言能力

思维品质

自主学习

语言能力

思维品质

语言能力、思维品质、学习能力

语言、文化、思维、学习能力

小组互动

迁移创新

生生互动

词汇积累：

formation：n. 形成

form：v. 形成

development：n.发展

evolution : n.进化

insect 昆虫

reptile: n.爬行动物

shellfish：n. 水生有壳生物

matter:n.

物质

amphibian：两栖动物

mammal:n哺乳动物

oxygen：n.氧

dissolve:v.溶解

cool down 冷却

appear:v. 出现

explode:v. 爆炸

atmosphere: n. 大气层

dinosaur:n. 恐龙

timeline:n.时间轴，时间表

carbon dioxide : n. 二氧化碳

prevent ... from 阻止，制止

settle into 形成

give birth to 产生，分娩

lay eggs 下蛋

global warming 全球变暖

recycle : v. 回收利用

reuse: v. 再用，重新使用

reduce: v. 减少

restore: v. 修复，重建

replenish: v. 补充

Teaching procedure: Step 1 Lead in. Study of the groups of life. 1.insect

2.plants

3.reptiles(爬行类)

4.shellfish(贝类)

5.fish 6.amphibians(两栖类)

7.mammals(哺乳类) Step2 Pre-reading Title: How life began on the earth Predicting: According to the picture and the title, what the text is mainly about? The text is mainly about the ____________ of the earth and the __________ of Life on it . Step 3 Reading

Activity : 1.

How life began on the earth Big

Bang

Several billion years later

______ and dissolved

______ harmful gases

appeared

appeared

Summary1:

threw

in all directions

a cloud of

Settled into A solid

After the “big bang”, it threw matters in all directions, the earth was a cloud of __________ .

Between 4.5 and 3.8 billion years ago

Exploded with

_____and _____. As the earth

cooled down Produced ________ Then it settled into a solid_________ . It exploded with_________ and ________ .

In time, they made the earth’s _________________ .

As it cooled down, _________ began to appear on its surface . It allowed the earth to

dissolve harmful gases and acids into __________

and _________ .

Then life began to develop . 2.

Find out the development of plants and animals according to the time they appeared on earth.

3

Small plants in the water

_____ and________

Green ____ on _____

land animals:

&

Summary2:

The arrival of _______ encouraged the development of early ______________. Next, ___________ began to grow_________. Later ____________appeared. Some were ________. Others, called__________ When the plants grew into forests, ________appeared for the first time . After dinosaurs disappeared, ________ became more important on the earth.

About 2.6 million years ago __________ appeared.

Activity3: Watch the video of “ How life began on the earth’’. Put the order of the development of life into a timeline.

(

) Insects and amphibians appeared. (

) The earth became a solid globe. (

) Reptiles appeared. (

) The earth was a cloud of dust. (

) Shellfish and other fish appeared. (

) Clever animals with hands and feet appeared (

) Dinosaurs appeared. (

) Small plants grew on the water. (

) Plants began to grew on the earth. (

) Water appeared on the earth. (

) The universe begin with a “big bang”.

(

) mammals appeared.

Events

1

1

1

1

1

1

1

⊕

1

⊕

●

●●●●●●●●●

⊕

1

4

⊕

Time

Big Bang

1

⊕

many

2.6

several 4.5-3.8

millions of

now million billion years billion

years later

years after the big years

ago bang

ago

Describe the evolution of Life on the earth according to the timeline . Eg: The universe began with a Big Bang .

Several billion years after the Big Bang... Between 4.5and 3.8 years ago ...

Then ...

Many millions of years later...

Later ...

Next ..

About 2.6 million years ago ...

Step4:Reflection In the last paragraph, we know humans face seriously global warming problem, which is threatening our existence.

What problem is caused by human beings? Why?

Problem: The earth may become ________________________ Reason: Because we human beings are putting too much __________________into the atmosphere, heat is prevented from_____________________________________

As students, what can we do to prevent the earth from becoming hotter and hotter?

Eg:There are a lot we students can do to prevent the earth from becoming hotter and hotter.

To begin with, we can

.

In addition, it would be a good idea if we

. What’s more important is that we should

_________________________________ .

Step 5. Homework (writing) 写作内容：请以约120词谈谈你对global warming 的看法，要点如下: 1.

造成气候变暖的原因

2.

气候变暖可能带来的后果

3.

如何防止气候变暖

Transitional Words（过渡词）: Firstly / First of all /

To begin with / To start with Secondly / Besides / What’s more / In addition Thirdly /

Finally /

Last but not least

5