资源简介

(共23张PPT)
Unit
6
The natural world
Unit
7
Welcome to unit
学习目标
通过本节课的学习，同学们能够:
1.认读生态系统相关基础词汇(如 ecosystem, grassland, desert, temperature 等),运用“There be...” “It‘s...because...”等基础句型描述生态环境特点。
2.读懂 Kitty 和 David 关于草原、沙漠生态系统的对话，提取关键信息(如
不同草原的动物差异、沙漠的气候特点);模仿对话结构,运用简单句式与同
伴就其他生态系统进行简短交流（如 “Do you know about... ” “It has...because...”）。
3.了解不同地区（如 Inner Mongolia, Africa）生态系统与当地生物
的关联，初步感知自然环境与人类生活的联系，培养尊重自然、
保护生态的意识。
1
2
3
4
read about different ecosysetems;
learn about protecting ecosystems;
give suggestions on how to protect ecosystems;
better understand the importance of protecting ecosystems.
To treat the earth kindly is to treat oneself kindly.
In this unit we will
The natural world is wonderful. Let’s learn about different
ecosystems and see what we can do help protect them.
Welcome to the unit
Fun facts about ecosystems
Let's explore the wonderful ecosystem together
Ecosystems that exist on land(陆地生态系统)
Ecosystems that exist in water(水生生态系统)
1.Forest Ecosystem（森林生态系统）：
2.Grassland Ecosystem(草原生态系统)：
3.Desert Ecosystem（沙漠生态系统）：
1.Freshwater Ecosystem(淡水生态系统)：
2.Marine Ecosystem(海洋生态系统)：
1.Forest Ecosystem（森林生态系统）：
Ecosystems that exist on land(陆地生态系统)
A forest ecosystem is a place with many trees, plants, animals, and non-living things (like soil and water) that live and work together.
2.Grassland Ecosystem（草原生态系统）：
A grassland is a big area covered mostly with grass—there are some small trees or bushes, but not many tall trees. It’s a home for many plants and animals that live together.
3.Desert Ecosystem（沙漠生态系统）：
Plants save water.
Animals stay cool (by hiding or being active at night).
They depend on each other, for example, insects eat plants, and lizards eat insects.
A desert is a very dry place with little rain. It can be hot (like the Sahara) or cold (like some deserts in Asia). But even here, plants and animals live together!
Ecosystems that exist in water(水生生态系统)
1.Freshwater Ecosystem（淡水生态系统）：
A freshwater ecosystem is a place with fresh water (not salty, like ocean water) where plants and animals live. It includes lakes, rivers, ponds, and even small streams!
2.Marine(/m ri n/)Ecosystem（海洋生态系统）：
A marine ecosystem is the big, salty ocean and all the living things (plants and animals) that live in it. It covers most of our planet—way more than land!
A
A 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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4
Do you know whether corals are animals or plants
思考:
Corals are animals, because they can’t make their own food like plants do through photosynthesis（光合作用）. They have tiny tentacles（触须） to catch food, such as plankton（浮游生物）.
B
Kitty and David are talking about ecosystems. Work in pairs and discuss
the topic. Use the conversation below as a model.
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.
Pair work to make a dialogue:
A:Do you know anything about ecosystems, …
B:I know that…
A: Oh, really Do you know anything about deserts
B:Well, it's…
A:Yes,…
B:…
…
Show Time
Checklist Activity: pair work 互评 师评
Contents Talk about the ecosystems and the reason.
Use the vocabulary we have learned today.
Speak clearly and fluently.
Speaking Use tone and body language properly.
Excellent Good To be improved
C
What other fun facts about ecosystems do you know
The tundra(苔原) ecosystem has a very short growing season because it’s so cold.
The rooftop garden ecosystem(small gardens on building tops) helps cool the building in summer, and butterflies love to visit the flowers there.
The tree hole ecosystem is a tiny home in old trees—rainwater fills the hole, and it becomes a pool for mosquito larvae, while birds sometimes drink from it!
Language Points
1.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。
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 ”
【对点练习】
那些云朵看起来像棉花糖。
The clouds ________ _______ some cotton candy.
look like
2.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。
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。
【对点练习】
( )1.Coral reefs are home to many kinds of creatures.(选出画线短语的含义)
A. 栖息地 B. 宿舍 C. 旅馆 D. 中心
2.四川省是大熊猫的故乡。
Sichuan Province _______ ________ _____ giant pandas.
A
is home to
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。
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。
常用表达：between...and... 在……和……之间
例: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。
【对点练习】
在语文和英语之间你更喜欢哪一个？
Which do you like better ________ Chinese _______ English
between and
4.The climate in deserts is so awful that only a few animals and plants can live there.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。
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。
例: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。
【对点练习】
1.I was ____ sleepy ____ I could hardly keep my eyes open.
A. not only ; but also B. either; or C. both; and D. so; that
2.那个女孩非常有创造力，总能想出新主意。
The girl is _____ creative _____ she always comes up with new ideas.
D
so that
当堂检测
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
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
THANKS
本课结束

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