资源简介

(共32张PPT)
Unit 7 The secret of memory
主题范畴：人与自我；人与自然
主题群：生活与学习
子主题：自我认识，自我管理，自我提升；积极的学习体验，恰当的学习方法与策略，勤学善思；地球与宇宙探秘
Key question
What does it take to remember something
了解自然界事物的记忆特点（以树木年轮为例），以及科学家由此对地球和人类历史的相关研究。
认读和理解文章重点单词、短语、句型的用法;
进一步巩固学习说明文的文本特征，预测阅读篇章的结构和内容。
Learning objectives 学习目标
After learning, I will be able to:
v. 包含；含有 p.110
adj. 专指的；特指的 p.110
n. 化学性质；化学 p.110
自然灾害 p.110
弄懂；弄清楚 p.110
1. contain /k n te n/
2. particular /p t kj l (r)/
3. chemistry / kem stri/
4. natural disaster
5. figure out
New words and phrases
Yes, it is. Because memory helps me remember who I am, who my family members and my friends are. It also helps me to recite Chinese poems, English vocabularies and math formulas (数学公式).
Is memory very important Why
Warming-up
文化背景
年轮的应用
计算树木年龄：根据年轮数量可推知树木年龄，用于考查森林的年代。
了解当年气候条件：年轮宽窄能反映树木生长与当时当地环境气候的关系。气候条件优越时，树木生长好，木质部增加多，年轮较宽；反之则窄。
判断方向：在北半球，树木年轮较疏的一面是南面，较密的一面是北面；南半球相反。
Think
What have scientists learnt about memory
Human beings have the ability to remember the past. In one way, nature is also able to remember past events, and this helps scientists learn about the history of the Earth and humankind.
P110
人类有记忆过去的能力。在某种程度上，大自然也能够记住过去的事件，这有利于科学家了解地球和人类的历史。
Pre-reading
The memories of trees
Look at the title and the picture, and guess the topic.
tree rings
(树木年轮)
The memories of trees
Read the article about tree rings to learn what they can tell us.
P110
Do trees have memories This may seem like a strange question, but trees can actually tell us things about the past. when a tree is cut down, you can see something special inside: rings. These rings are the memories of trees. Tree rings contain lots of secrets from the forest.
While-reading
Every year the tree grows, there is a new ring. Scientists can count the rings to tell the age of the tree. They also study tree rings to learn about the climate and the environment. Tree rings are a record of the climate. Some rings are quite wide. This is a good sign as it means the tree grew well and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place.
Scientists also look at tree rings to study natural disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen ” and “How common are forest fires ”
scar /skɑ (r)/
n. 伤疤
Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada was built in the year 1021 CE.
It’s amazing that trees can tell us so much, even though they cannot talk!
Match the general idea of each paragraph.
Tree rings are the memories of trees.
Tree rings record a tree’s age and the climate.
Tree rings help us understand human history.
Trees cannot talk but can tell us many things.
Task 1
Tree rings can be used to study natural disasters.
Para. 1
Para. 2
Para. 3
Para. 4
Para. 5
Task 2
Let’s analyze the structure of the article.
Introduction or lead-in
The body part (3 details)
A brief conclusion
Notes
Scientists have long studied tree rings. This branch of science is called dendrochronology. Experts in this field use tree rings to learn more about our world. They compare tree rings from different trees in the same area to collect data about the past.
科学家们对树木年轮的研究由来已久。这一学科分支被称为树木年代学。该领域的专家利用树木年轮来更多地了解我们的世界。他们比较来自同一地区不同树木的年轮来收集关于过去的数据。
P111
Task 3
Why are tree rings useful How do scientists make use of them Complete the mind map below with the information from the article on page 110.
P111
are a record of climate change
Scientists look at the tree ring patterns to learn about climate change in a particular place.
provide information about natural disasters
Scientists look at tree rings to study natural disasters.
help us understand human history
Scientists use tree ring patterns to learn the age of old buildings.
Find the words and phrases in the article and match them with their meanings.
(1) contain (line 4)
(2) particular (line 12)
(3) natural disaster (line 14)
(4) chemistry (line 24)
(5) figure out (line 24)
a used to refer to a specific
person or thing
b to discover the answer
c to have/hold something inside
d the chemicals that something
is made up of
e used to refer to an earthquake,
flood, forest fire, etc.
Task 4
P111
What else do you know about tree rings Share with your classmates.
P111
Post-reading
How do they find trees to study
Scientists often look for old trees in forests or protected areas. They also study tree rings in logs or wood samples from historical buildings.
What tools do they use
They use special tools like increment borers (探木钻) to take small samples from trees without harming them. They also measure tree rings with microscopes.
Possible answers
What have they discovered about the past
By studying tree rings, they learn about past weather, natural disasters like droughts, and even human history, like how people used wood in old times.
Why is their work important
Their research helps us understand climate changes and protect forests. It also warns us about floods or droughts caused by cutting too many trees.
The memories of trees
Do trees have memories This may seem like a strange question, but trees can actually tell us things about the past. when a tree is cut down, you can see something special inside: rings. These rings are the memories of trees. Tree rings contain lots of secrets from the forest.
= (in fact)
adv. 事实上；实际上
n. 戒指；环状物；钟声；铃声
v. 打电话；鸣响
v. 包含；容纳
Useful expressions
Every year the tree grows, there is a new ring. Scientists can count the rings to tell the age of the tree. They also study tree rings to learn about the climate and the environment. Tree rings are a record of the climate. Some rings are quite wide. This is a good sign as it means the tree grew well and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place.
n. 气候；氛围
n. 环境
……的记录
adj. 宽的；广泛的
延伸：widely adv. 广泛地
adj. 狭窄的
延伸：narrowly
adv. 勉强地；狭隘的
n. 模式；图案
Scientists also look at tree rings to study natural disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen ” and “How common are forest fires ”
自然灾害
n. 成长；生长
Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada was built in the year 1021 CE.
It’s amazing that trees can tell us so much, even though they cannot talk!
弄清楚；弄懂
n. 考古学家
尽管；虽然
1. contain /k n te n/ v. 包含；含有
树木年轮包含着森林中的许多秘密。
例如：含水量
water contain
Tree rings contain lots of secrets from the forest.
词性转换
contain /k n te n/ n. 含量；容量
注意
container 则是指具体意义上的容器、集装箱、货柜等。
固定短语
in particular 特别地；尤其
be particular about 对……挑剔
2. particular /p t kj l (r)/ adj. 专指的；特指的
正因如此，科学家能通过年轮模式解读特定地区的气候变迁。
Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place.
例如：他为什么要特别注意她的轿车呢？
Why should he notice her car in particular
3. natural disaster 自然灾害
科学家还通过观察树木年轮来研究自然灾害。
Scientists also look at tree rings to study natural disasters.
注意
disaster 是可数名词，特指某一次或某一种自然灾害时，用单数形式，但普遍意义上泛指时通常需用复数。
例如：这场自然灾害已造成几千只猴子死亡。
The/This natural disaster has killed several thousand monkeys.
4. chemistry / kem stri/ n. 化学性质；化学
如今，他们还能分析每圈年轮的化学成分，精确判断树木被砍伐的时间。
Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down.
注意
chemistry 既指化学性质、化学反应，也指化学这门学科。
例如：海伦学了三年化学。
Helen has studied chemistry for three years.
5. figure out / kem stri/ 弄懂；弄清楚
如今，他们还能分析每圈年轮的化学成分，精确判断树木被砍伐的时间。
Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down.
例如：我弄不懂怎样做这件事。
I can’t figure out how to do this.
辨析
figure out / find out / work out
短语 深层意义 搭配 例句
figure out 通过思考弄明白/计算出 问题 方法 数字
find out 查明事实或真相 真相 消息 答案
work out 解决/计算出/制定计划/健身锻炼 问题 计划 数字
I figured the puzzle.
We found out the truth.
She worked out a plan.
通过辨析可知，在表“解决问题 / 计算出”时，figure out 和 work out 可以互换；figure out 宾语多为抽象事物（问题、方法等），而 find out 宾语多为具体事物（事实、真相等），两者核心意义不同，因此通常不能互换使用。
基础作业：
Finish the exercises.
Preview Cross-curricular connection on P112.
拓展作业：
1. 分组讨论大自然中还有哪些事物有类似年轮的记忆。
2. 根据讨论结果制作简单的科普小海报。
Thank you!

展开更多......

收起↑