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(共14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:
New words and phrase
communicate v. 沟通；交流
species n. 种；物种
communicate with 与……沟通
Pre-Listening
How much do you know about trees Discuss the questions below.
(1) How do trees communicate with one another
(2) Do trees have families and relatives like us
(3) What makes trees grow better and stronger
Do you know what is “podcast”
内容形式：
Podcast的内容可以是音频、视频或两者的结合。音频形式的Podcast最为常见，通常包括访谈、讲座、故事叙述等。视频形式的Podcast则可能包含更多的视觉元素，如演示文稿、动画或现场录制的内容。
Background
Podcast，中文译为“播客”，是一种数字媒体发布方式，允许用户通过互联网订阅并自动接收音频或视频文件。
定义与特点：
Podcast结合了“iPod”（苹果的一款便携式音乐播放器，现已扩展为泛指任何能播放音频或视频的设备）和“broadcast”（广播）两个词，形成了一种新的媒体形式。
While-Listening
Famous trees in China
Trees and people
Trees help each other
Listen to the podcast The Natural World and tick( ) the main topic of it.

Listen again. Decide whether the following statements are true (T) or false (F).
( ) Trees use their branches to communicate with each other.
( ) Trees can ask each other for help when bad things happen to them.
( ) Older trees and younger trees help each other.
( ) Healthy trees help sick trees.
( ) Most trees share things with trees from different species.
( ) It is harmful when the branches and leaves of trees join together.
F
T
T
T
F
F
roots
same
good
Amazing Trees
Good evening. Thanks for joining me in this week’s The Natural World. I’m Rebecca. For the next four weeks we’ll talk about trees around us. And today’s topic is about how trees help each other. Being a tree can be difficult, but trees have found ways to make it easier for one another. In fact, trees are not alone. They have very long roots, and they use them to communicate with their neighbours. When something bad happens to a tree, it may be able to send a message through its roots. Then the other trees will try to help it. Did you know that, like us, trees also have families
Tapesript
Older trees give younger trees food and water. Younger trees also help older trees survive. When one tree becomes ill, the healthy trees around it will try to help. Most trees only share things with trees from the same species. However, some trees always help their neighbours, even if they aren’t their relatives. Trees know they are stronger together. When their branches and leaves join together, they don’t need to worry about strong winds. Together they grow better and stronger. Aren’t trees amazing That’s all for today. Next week I’ll talk about famous trees in China. What are they Think of your favourite and join me next Tuesday to find out more. See you then!
What other amazong facts do you know about trees Share your fact with your classmates.
Discuss the questions below.
沙箱树
这种树可以长到30米高，树干上长满致密的刺，树皮、种子和树叶中储存着毒药。更神奇的是，当沙箱树扔下种子时，会像子弹一样将它们从树干发射出来，时速可达240公里，这对人们构成了危险。
榕树
榕树具有独木成林的能力。其躯干上往往生有许多随风飘荡的气根，这些气根一旦接触地面，便可扎入土壤中，逐渐变成树的新干，与主干共同支撑起树冠，形成大片的树荫。
年轮
年轮是树木树干横截面上的同心圆环，每一圈代表一个生长周期。年轮的宽窄会因季节、气候、土壤条件以及树木自身的生长状况而有所变化。一般来说，春夏季节树木生长旺盛，年轮部分较为柔软且宽厚，颜色较浅；而秋冬季节树木生长较慢，年轮部分则较为狭窄，颜色较深。
Thank you!

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