资源简介

(共26张PPT)
Welcome to the unit
Unit 7
The natural world
To learn about different ecosystems and fun facts about them.
To talk about ecosystems.
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学习目标
To master some new words and phrases.
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What ecosystems do you know What fun facts about them do you know
新课讲授
Lead in
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!
Kitty is learning about ecosystems. Read the facts below with her and
tick the ones you already know.
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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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1. Do you know whether corals are animals or plants
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）.
Further thinking
2. 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!
Kitty and David are talking about ecosystems. Listen to the tape and answer the questions below.
1. What ecosystems are they talking about
2. What fun facts about these ecosystems
Grasslands and deserts.
Grasslands in different places are home to different animals. It's very dry in deserts because there's little rain. And the difference in temperature between day and night is huge. The climate in deserts is so awful that only a few animals and plants can live there. The desert plants keep water in their leaves, and many animals there get water from these plants.
Listening
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.
Reading
A: Do you know anything about ecosystems, …
B: I know that…
A: Oh, really Do you know anything about ...
B: Well, it's…
A: Yes, …
B: It’s true. …
Work in pairs and discuss the topic. Use the conversation below as a model.
Speaking
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 Show time
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……”，引出结果状语从句，其中so是副词，修饰形容词或副词。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. The bag is so heavy that I cannot carry it.
这个袋子太重了，我提不动。
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。
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
当堂检测
Recite Part B in this lesson.
Preview Reading on pages 94-97.
Homework

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