资源简介

(共25张PPT)
Unit 7
The natural world
Welcome to the unit
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02
学习目标
03
To learn about different ecosystems and fun facts about them.
To talk about ecosystems.
To master some new words and phrases.
What different types of ecosystems do you know
Lead in
Rainforest ecosystem
Ocean ecosystem
Look and say
新课讲授
Grassland ecosystem
Polar ecosystem
What fun facts about these ecosystems do you know
Kitty is learning about ecosystems. Read the facts
below with her and tick the ones you already know.
Rainforests are home to over half of all the types of animals and plants on earth.
Coral reefs look like rocks, but they support a lot of life in just a small area.
Grasslands often lie between deserts and forests.
The ice is home to animals like polar bears and penguins.
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2
3
4
Presentation
desert ecosystem
wetland ecosystem
What other ecosystems do you know What fun facts about them do you know
Further thinking
Fun facts about deserts
Watch and learn
Fun facts about wetlands
Kitty and David are talking about ecosystems. Listen to the tape and fill in the table.
Grasslands Deserts
Climate It’s very dry with little 3.______________. There’s huge difference in 4._______________between day and night.
Animals & plants Grasslands in different places are home to different animals, like 1.____________ in Inner Mongolia, and 2.________________ in Africa. 5._______________ animals and plants can live there. The desert plants keep water in their 6.______________, and many animals can get water from these plants.
horses and cows
lions and giraffes
rain
temperature
Only a few
leaves
Listen and fill
Kitty: Do you know anything about ecosystems, David
David: I know that grasslands in different places are home to different animals. In Inner Mongolia, there are horses and cows, but in Africa, there are lions and giraffes.
Kitty: Oh, really Do you know anything about deserts
David: Well, it's very dry in deserts because there's little rain. And the difference in temperature between day and night is huge.
Kitty: Yes, the climate in deserts is so awful that only a few animals and plants can live there.
David: It's true. The desert plants keep water in their leaves, and many animals there get water from these plants.
Listen and read
Kitty: Do you know anything about ecosystems, David
David: I know that grasslands in different places are home to different animals. In Inner Mongolia, there are horses and cows, but in Africa, there are lions and giraffes.
Kitty: Oh, really Do you know anything about deserts
David: Well, it's very dry in deserts because there's little rain. And the difference in temperature between day and night is huge.
Kitty: Yes, the climate in deserts is so awful that only a few animals and plants can live there.
David: It's true. The desert plants keep water in their leaves, and many animals there get water from these plants.
Role-play
Work in pairs and discuss the topic. Use the conversation below as a model.
A: Do you know anything about ...
B: l know that ... …
A: Oh, really Do you know anything about ...
B: Well, it's ... And …
A: Yes, the climate in ... is ...
B: It's true. …
Pair work
What other fun facts about ecosystems do you know
Oceans cover about 71% of the earth's surface, making them the largest ecosystem on earth.
Grasslands have very few trees but lots of tall grasses and wildflowers.
In deserts, some plants can live without rain for years.
Polar bears live in the North Pole, and penguins live in the South Pole.
…
Group work
be home to 意为“是……的栖息地/所在地”，通常用于描述某地是某一特定事物的起源或聚集地，可以指地理领域、生态领域或文化领域。home 前面不使用任何冠词。
1. Rainforests are home to over half of all the types of animals and plants
on earth.雨林是地球上所有动植物种类中一半以上物种的家园。
e.g. The Amazon rainforest is home to thousands of plants and animals.
亚马孙雨林是成千上万动植物的栖息地。
Hangzhou is home to green tea in China. 杭州是中国绿茶的故乡。
China is home to a rich and ancient culture.
中国是丰富而古老文化的发源地。
Language points
look like 意为“看起来像”，有以下几种用法：
(1)描述外貌，指某人或某物和其他人或物具有很大的相似性。
(2)描述天气或环境，意为看起来有某种可能。
(3)表达某种可能性，指意外情况可能发生。
询问某人的外貌长什么样使用句型“What do/does+主语+look like ”意为“……长什么样 ”
2. Coral reefs look like rocks, but they support a lot of life in
just a small area.珊瑚礁看起来像岩石，但它们在很小的区
域内支持着大量的生命。
e.g. The girl looks like her mother. 那个女孩看起来像她妈妈。
The stone looks like a dog. 那块石头看起来像只狗。
The sky looks like it’s going to rain. 天气看起来要下雨了。
It looks like we might be late for the meeting.
看起来我们可能要开会迟到了。
—What does your new teacher look like 你的新老师长什么样？
—He is tall and strong. 他又高又壮。
3.Grasslands often lie between deserts and forests.
草原通常位于沙漠和森林之间。
And the difference in temperature between day and night is huge.
昼夜温差很大。
常用表达：between...and... 在……和……之间
e.g. There is a small path between the two villages.
这两个村庄之间有一条小路。
The chair is between the bed and the big desk.
椅子在床和大书桌之间。
辨析: between 与among
between 主要用于表示在两个人或事物之间，强调
两者之间的明确关系。
among 用于三者或三者以上的人或事物之间，通
常强调一个群体或整体中的关系。
e.g. Among all the students in his class, he sits between Lucy and Linda.
在他班级的所有学生中，他坐在露西和琳达之间。
4. I know that grasslands in different places are home to different animals.
长难句分析：这是一个含宾语从句的复合句。主句主语是I，谓语是know，that grasslands in different places are home to different animals是宾语从句；从句中的in different places是介词短语作后置定语，修饰grasslands。
5. Yes, the climate in deserts is so awful that only a few animals
and plants can live there. 是的，沙漠里的气候如此恶劣，以
至于只有少数动植物能够在那里生存。
so...that...意为“如此……以至于……”，用于表达因果关系，强调结果或影响。描述一个事件或情况如此强烈，以至于导致另一个事件或情况发生。
e.g. He did so well in the exam that everyone praised him.
他考得那么好，人人都称赞他。
辨析: so...that... 与so that
so... that... 意为“如此……以至于……”，引导结果状语从句，so 后面接形容词或副词，that 后面接从句，so 和that 要分开。
so that 意为“以便于；为了”，通常引导目的状语从句，从句中通常有情态动词can，could，may，might 等。主句在前，从句在后，且主句和从句之间没有逗号隔开。
e.g. It was so cold outside that we had to stop the game.
外面太冷了我们不得不停止了比赛。
I set up the computer so that they could work at home.
我把电脑设置好这样他们就可以在家里办公了。
一、根据句意及所给的汉语提示写出单词
1.The (珊瑚) in the sea, which is very beautiful, is in danger.
2.Rising global temperatures are changing the earth's ________ (气候)greatly.
3. (企鹅)live in very cold places. They have thick feathers to keep warm.
4.We should keep the balance of the _____________(生态系统).
5. It is (自然的) that people close their eyes when seeing strong lights.
coral
Penguins
climate
ecosystem
natural
当堂检测
二、根据中文提示完成句子
1.因为沙漠几乎没有降雨，所以沙漠通常非常干旱。
As there in deserts, they are usually very dry.
2草原经常坐落于沙漠和森林之间，是野生动物的家园。
Grasslands are often between deserts and forests and are wild animals.
3.众所周知沙漠的气候如此糟糕以至于只有一些动物和植物生活在那里。
It's known to all that is so awful that only a few animals and plants live there.
4.——你能告诉我一些关于生态系统的知识吗？
——当然可以。世界上一半的动植物生活在雨林里。
—Can you tell me something ____________________ —Of course. Half of the world's animals and plants live in rainforests.
5.你今天必须完成至少一半的工作。
You must finish at least today.
is little rainfall
home to
the climate in deserts
half of the work
about ecosystems
Search on the internet to find more fun facts about ecosystems.
Preview Unit 7 Reading.
Homework

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