资源简介

(共27张PPT)
Unit 7 The natural world
Welcome to the unit
What can you see in the picture
We can see a white bird flying over the water.
Where does this kind of bird like to live
In open areas with water, like wetlands (湿地).
What is an ecosystem
An ecosystem(生态系统) is like a community where living things and non-living things work together.
What different types of ecosystems do you know
forests
oceans
wetlands
grasslands
polar regions(地区)
What can you see in this picture
Rainforests are home to over half of all the types of animals and plants on earth.
Rainforest ecosystem
...的家园
Coral reefs look like rocks, but they support a lot of life in just a small area.
/ri f/
n. 礁
/ k r l/
n. 珊瑚
Ocean ecosystem
What can you see in this picture
Grassland ecosystem
wide open areas with green grass and a few trees
Grasslands often lie between deserts and forests.
What can you see in this picture
v. 位于
Polar ecosystem
penguins stand on the ice
The ice is home to animals like polar bears and penguins.
/ pe ɡw n/
n. 企鹅
What can you see in this picture
A. Fun facts about ecosystems
rainforest ecosystem
ocean ecosystem
grassland ecosystem
polar ecosystem
What other types of ecosystems do you know
deserts
tundra(苔原) ecosystem
tree hole ecosystem
B Listening
What are they talking about
Listen to Kitty and David’s conversation and answer the questions.
Ecosystems.
Grasslands and deserts.
What ecosystems are they
Read in roles
/ kla m t/
n.气候
Read aloud
B Read and fill in the blanks.
Grasslands Deserts
Climate ─ It’s 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, but (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
C. 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.
A: Do you know anything about ecosystems
B: Yes! I know that …in different places are home to... In..., there are ..., but in..., there are ...
A: Oh, really Do you know anything about …
B: Well, …it’s ... And...
A: Yes, the climate in ... is ...
B: It’s true. They help … and give food to ...
Make up a new dialogue
Discussion: Why is it important to protect the environment
To treat the earth kindly is to treat oneself kindly.
句中的 so ... that...意思是“如此……以至于……”,引出结果状语从句。其中so是副词修饰形容词或副词。如:
The bag is so heavy that I cannot carry it.
这个袋子太重了，我提不动。
1. Yes, the climate in deserts is so awful that only a few animals and plants can live there.
并列连词 and、but、or和 so
我们可以用并列连词 and、but、or和so来连接单词、短语或者句子。如:
Our English teacher is kind and helpful.
我们的英语老师既和蔼又乐于助人。
The boy is not very tall but he runs very fast.
这个男孩个子不是很高，但跑得很快。
Do you often go home on foot or by bicycle
你通常回家是步行，还是骑自行车
2. Coral reefs look like rocks, but they support a lot of life in just a small area.
注意:并列连词可以用来表示并列关系、转折关系、选择关系或因果关系等。
并列连词 and 意思是“和,又”,表达并列关系。如:
Mike likes playing football and singing songs.
迈克喜欢踢足球和唱歌。
并列连词 but 意思是“但是”,表达转折关系,所连接的成分意思往往相反或相对。如：
The room was small but comfortable. 房间虽小,但很舒适。
并列连词 or意思是“或者”,表达选择关系。如:
Which do you like better, juice or coffee 果汁和咖啡,你更喜欢哪一个
注意: 在否定句中并列成分通常用or连接,而不用and。如:
I cannot speak Japanese or French. 我不会说日语和法语。
并列连词so意思是“因此,所以”,表达因果关系,常用来连接两个简单句。如:
It began to rain, so we went home.开始下雨了,所以我们就回家了。
注意:并列连词so和从属连词 because(因为)不能一起使用。
The dog was hungry, so we gave it something to cat. ( √ )
Because the dog was hungry, so we gave it something to eat. (×)
一、翻译句子
世界上一半的动植物生活在热带雨林中。
2. 珊瑚礁看起来像岩石，但它们在很小的区域内维持着众多生命。
3. 草原通常位于沙漠和森林之间。
Half of the world’s animals and plants live in rainforests.
Coral reefs look like rocks, but they support a lot of life in just a small area.
Grasslands often lie between deserts and forests.
当堂检测
二、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
1.We watched a __________ show at the zoo yesterday.
2. __________ are home to many fish and other sea animals.
3.Plants, fishes and the sun are part of the __________ of this lake.
4.The heavy __________ could help the plants grow.
5.This area is famous for its extremely (极端地) dry __________.
penguin
Coral reefs
ecosystem
rainfall
climate, penguin, rainfall, ecosystem, coral reefs
climate
选词填空
三、填空题
The climate in deserts is ______ awful ______ only a few animals can survive.
Coral reefs look like rocks, ______ they are actually made of tiny living organisms called polyps.
Rainforests are home to half of the world’s plants ______ animals.
Polar ice ______ penguins a place to live and breed.
“Reduce plastic ______ protect the ocean!” (Choose or/and/so)
so
that
but
and
gives
and

展开更多......

收起↑