资源简介

(共24张PPT)
Unit 3 Trees and us
主题范畴：
人与自然
主题群：
环境保护
子主题：
热爱与敬畏自然，与自然和谐共生
Key question
Why do we need trees
understand what trees do for us.
identify amazing facts about trees.
describe what we can do to help protects trees.
explain the relationship between trees and humans.
Unit objectives 单元目标
I can:
Lead-in
From the podcast The Natural World, we have learnt that trees also have families and
relatives like us. Do they have senses too
Tree senses
In the past, scientists didn’t know that trees could sense things. Now, they are discovering that trees can notice lots of things around them!
Trees can sense many different things with their roots. For example, they can feel where “up” and “down” are. There is no light down in the earth, but the roots always know which way to grow.
Read
Trees can feel different temperatures. They know when to drop their leaves in autumn, and when to grow new leaves in spring.
If an animal starts biting a tree of a certain species, the tree can find out what happens. For example, if a deer starts eating from a tree, the tree can make its leaves taste really bad after a while.
Tree roots can sense different sounds. They really like the sound of running water when it is dry. If the sound continues for a long time, the roots will slowly start growing towards it.
Trees can sense different kinds of light and colours. They know where the sun is, so their branches grow in that direction. That’s why trees in the northern hemisphere (半球) usually have more branches growing out on the south side. There are still many things we don’t know about trees. Scientists are working hard to find out more.
Read the article about how trees sense things. Match the headings below with the paragraphs.
Tree senses
In the past, scientists didn’t know that trees could sense things. Now, they are discovering that trees can notice lots of things around them!
Task 1
(1) ________________
Trees can sense many different things with their roots. For example, they can feel where “up” and “down” are. There is no light down in the earth, but the roots always know which way to grow.
(2) ________________
Trees can feel different temperatures. They know when to drop their leaves in autumn, and when to grow new leaves in spring.
c
a
(3) ________________
If an animal starts biting a tree of a certain species, the tree can find out what happens. For example, if a deer starts eating from a tree, the tree can make its leaves taste really bad after a while.
(4) ________________
Tree roots can sense different sounds. They really like the sound of running water when it is dry. If the sound continues for a long time, the roots will slowly start growing towards it.
b
e
(5) ________________
Trees can sense different kinds of light and colours. They know where the sun is, so their branches grow in that direction. That’s why trees in the northern hemisphere (半球) usually have more branches growing out on the south side. There are still many things we don’t know about trees. Scientists are working hard to find out more.
d
Read the article again and answer the questions.
Task 2
What parts of the tree are mentioned (提及) in the article
Their toots, leaves and branches.
If an animal starts biting a tree of a certain species, the tree can find out what happens. For example, if a deer starts eating from a tree, the tree can make its leaves taste really bad after a while.
How does the tree react when an animal of a certain species starts biting it
Read Para. 3 and answer the question.
It can make its leaves taste really bad.
Tree roots can sense different sounds. They really like the sound of running water when it is dry. If the sound continues for a long time, the roots will slowly start growing towards it.
What kind of sound do tree roots really like when it is dry
Read Para. 4 and answer the question.
They really like the sound of running water.
Read Para. 5 and answer the question.
Trees can sense different kinds of light and colours. They know where the sun is, so their branches grow in that direction. That’s why trees in the northern hemisphere (半球) usually have more branches growing out on the south side. There are still many things we don’t know about trees. Scientists are working hard to find out more.
Why do trees in the northern hemisphere usually have more branches growing out on the south side
Because trees can sense light and know where the sun is, and in the northern hemisphere, the sun is more on the south side, so their branches grow more in that direction.
Tree senses
In the past, scientists didn’t know that trees could sense things. Now, they are discovering that trees can notice lots of things around them!
Trees can sense many different things with their roots. For example, they can feel where “up” and “down” are. There is no light down in the earth, but the roots always know which way to grow.
Notes
在过去
在泥土里
Trees can feel different temperatures. They know when to drop their leaves in autumn, and when to grow new leaves in spring.
If an animal starts biting a tree of a certain species, the tree can find out what happens. For example, if a deer starts eating from a tree, the tree can make its leaves taste really bad after a while.
查明；查清；发现
make sb. do sth.
使某人做某事
过了一会儿
Tree roots can sense different sounds. They really like the sound of running water when it is dry. If the sound continues for a long time, the roots will slowly start growing towards it.
Trees can sense different kinds of light and colours. They know where the sun is, so their branches grow in that direction. That’s why trees in the northern hemisphere (半球) usually have more branches growing out on the south side. There are still many things we don’t know about trees. Scientists are working hard to find out more.
很长一段时间
朝……方向生长
在那个方向
在北半球
Making a booklet about trees
In this project, you are going to work in groups and make a class booklet about different types of trees. Each group will make one page.
Step 1
Think about the trees around you (e.g. ginkgo (银杏), maple (枫树), pine tree, willow (柳树) and choose one kind of tree in your group.
Step 2
For example:
What does the leaf look like (e.g. size, colour, shape)
Which kind of tree does it come from
What fruit does the tree have
Why is the tree important to us
Search for information about this type of tree. Then discuss in your group and decide what to include on your page.
Step 3
Organize the information you collected and design your page. You may add some pictures. If possible, find a leaf and put it on the page. Use the example below to help you.
Step 4
Present your page to the class. Then put together the pages to make a class booklet.
大树的作用在于提供阴凉处。（大树底下好乘凉。）
——乔治·赫伯特（杰出的英国诗人）
Thank you!

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