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学习任务单
课程基本信息
学科 英语 年级 八年级 学期 秋季
课题 Unit 7 The natural world (Reading)
学习目标
获取并梳理生态系统的基本概念，以及地球上三大生态系统的分布、功能与重要性等相关信息，构建关于语篇的结构化知识； 赏析科普类语篇语言特点，理解明喻的修辞手法，并运用语篇的词汇和句型表达； 探讨人类活动对生态环境的影响，提出保护措施，增强生态保护的意识。
课前学习任务
复习Unit 7 The natural world (Welcome to the unit)的内容； 上网搜索和了解更多不同生态系统的趣味知识。
课上学习任务
【学习任务一】 Students recall the names of different ecosystems they learned last lesson. 【学习任务二】 Students talk about what they know about oceans, wetlands and forests. 【学习任务三】 Students go through the article quickly and find out what type of writing the article is. 【学习任务四】 Students skim the article and get the main idea of each part. 【学习任务五】 Students read paragraph 1 and answer： What is an ecosystem Are ecosystems always large Is each ecosystem important Why or Why not 【学习任务六】 Students read paragraphs 2-4 and complete the following table: 【学习任务七】 Students read paragraph 5 and answer: Why are the three ecosystems important for the earth 【学习任务八】 Students finish Part C on page 97. 【学习任务九】 Students discuss: How do human activities affect the ecosystems Give more examples. What can we do to protect the ecosystems in our daily life 【学习任务十】 Students speak for ecosystems: 【学习任务十一】Homework Must do Introduce the three ecosystems, using the language we learned today. Choose to do Make a poster about one ecosystem.
推荐的学习资源
无。(共16张PPT)
年 级：八年级 学 科：英语（译林版）
Unit 7 The natural world
(Reading)
Revision
Ecosystems
Rainforest
Ocean
Desert
Polar
Grassland
Wetland
Pre-reading
What are the three main ecosystems on earth
Pre-reading
What do you know about oceans, wetlands and forests
Cover most of the earth
Salt water
Fish and dolphins
Places with lots of water
Swamps
Birds and fish
Cover much of the earth’s land area
Full of trees
Different animals
While-reading
What type of writing is the article
A popular science article
Paragraph(s)
Main ideas
Introduction (Para. 1) A general to an ecosystem
Main body (Paras. 2-4)
Detailed about the three ecosystems
Conclusion (Para. 5) The of the three ecosystems
introduction
information
importance
a In a newspaper.
b In a travel guide.
c In a geography magazine.
Where can we read this kind of article
While-reading
Read paragraph 1 and answer
1. What is an ecosystem
2. Are ecosystems always large
3. Is each ecosystem important Why or why not
An ecosystem includes all the living things and non-living things in an area.
be made up of
air, water, soil and sunlight
No. Ecosystems can be of different sizes, from small ponds to large grasslands.
Yes. It helps keep the balance between all its members and the greater environment.
While-reading
Read paragraphs 2-4 and complete the following table
Special name Size Importance
Cover around 71% of the earth’s surface
Cover about 6% of the earth’s land area
Make up nearly a third of the earth’s land area
Produce about 70% of the earth’s oxygen
Support the water cycle
Be home to about 40% of the world’s plants and animals
Help get rid of pollution and make the water clean
Prevent floods by storing water like giant sponges
The ocean is just like the “ ” of the earth.
Wetlands act like the “ ” of the earth.
Forests are called
the “ ” of the earth.
Take in carbon dioxide and produce oxygen
Trap harmful things in their leaves and clean the air
heart
kidneys
lungs
1. What is the function of the words like around, about and nearly
To show accuracy (准确性).
2. What rhetorical device is used here
While-reading
Why does the writer compare each ecosystem to these organs (器官)
To show they are important to the earth just as organs are important to the human body.
Each of these ecosystems supports millions of plants and animals.They keep
the planet healthy and make our world a better place.
While-reading
Read paragraph 5 and answer
Why are the three ecosystems important for the earth
Post-reading
The biggest ecosystem
Hello listeners!Welcome to Science with Doctor Ted.Today I'lltalk to youabout the biggest ecosystem on our planet.
Do you know what it is Yes,it's the ocean.It covers the largest areaof the earth's(1)_______ _and holds 97%of the earth's water.It(2)___________many animals and plants.
Do you know that some of the plants in the ocean produce (3)_______for the animals living there What's more,the ocean can(4) 25%-30%of carbon dioxide and(5) heat.It plays an important(6)________in slowing down climatechange.
Sadly,we're facing a serious problem:ocean pollution.There aremillions of tons of plastic in the ocean,and it's very difficult to(7)_______it.It's time for us to take action and protect the ocean.If we don't,the plastic will harm the(8)_______of the oceanecosystem.
Post-reading
surface
is home to
oxygen
take in
store
role
Post-reading
get rid of
balance
How do human activities affect the ecosystems Give more examples.
Post-reading
How do human activities affect the ecosystems
Some people cut down trees for wood or farming. This will damage the forests and make some animals homeless.
Some people want to make the wetlands smaller in order to have more space for farms and buildings. This will lead to less space for wildlife.
Don’t throw rubbish
Pick up litter
Use environment-friendly products
Use both sides of the paper
Call on people to take action
Small actions, big changes.
What can we do to protect the ecosystems in our daily life
Post-reading
Speak for ecosystems
Ladies and gentlemen,
Today I want to speak for (name)
It (size and importance)
Therefore, it is just like (special name)
Sadly, it is facing a serious problem:
(problem)
(name) need our help.
Let’s do something to protect it. For example,
We (how to protect)
Ladies and gentlemen, let’s work together to
protect (name).
Thank you!
Work in groups of four
Choose an ecosystem
Make a speech
Homework
Must do
Introduce the three ecosystems, using the language we learned today.
Choose to do
Make a poster about one ecosystem.
The importance of the ecosystem
The problems it faces
What we can do
谢谢观看教学设计
课程基本信息
学科 英语 年级 八年级 学期 秋季
课题 Unit 7 The natural world (Reading)
教学目标
获取并梳理生态系统的基本概念，以及地球上三大生态系统的分布、功能与重要性等相关信息，构建关于语篇的结构化知识； 赏析科普类语篇语言特点，理解明喻的修辞手法，并运用语篇的词汇和句型表达； 探讨人类活动对生态环境的影响，提出保护措施，增强生态保护的意识。
教学内容
教学重点： 获取并梳理生态系统的基本概念，以及地球上三大生态系统的分布、功能与重要性等相关信息，构建关于语篇的结构化知识； 赏析科普类语篇语言特点，理解明喻的修辞手法，并运用语篇的词汇和句型表达。 教学难点： 探讨人类活动对生态环境的影响，提出保护措施，增强生态保护的意识。
教学过程
Step 1. Revision Have students recall the names of different ecosystems they learned last lesson. Step 2. Pre-reading Have students view the title and pictures: What are the three main ecosystems on earth Activate students’ knowledge about the three ecosystems: What do you know about oceans, wetlands and forests Step 3. While-reading Have students go through the article quickly and find out what type of writing the article is. Have students skim the article and get the main idea of each part. Have students read paragraph 1 and answer: What is an ecosystem Are ecosystems always large Is each ecosystem important Why or Why not Have students read paragraphs 2-4 and complete the following table: Have students read paragraph 5 and answer: Why are the three ecosystems important for the earth Step 4. Post-reading Have students finish Part C on page 97. Have students discuss: How do human activities affect the ecosystems Give more examples. What can we do to protect the ecosystems in our daily life Have students speak for ecosystems: Step 5. Homework Must do Introduce the three ecosystems, using the language we learned today. Choose to do Make a poster about one ecosystem.

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