Unit 5 Understanding ideas（34页）课件 2025-2026学年高中英语外研版（2019）必修第一册

Unit 5
Into the wild
Understanding Ideas
At the end of the class,we’ll be able to
1.Comprehend the mystery of the monarch’s migration and serious challenges in this process;
2.Analyze the logic (especially cause-and-effect) between the lines;
3.Raise the awareness of protecting environment and animals。
Learning objectives
Look at the picture, what information can you get?
monarch butterfly
They are moving from north to south. This annual movement is called migration.
Activity 1
Lead-in
Why do animals migrate?
They migrate to find food, seek a partner, or in search of warmer weather.
Why does the author use “wonderful” to describe monarch’s migration?
The introduction of the monarch’s migration.
Activity 2
Read for main idea
The _____and_______ of the monarch’s migration.
time
distance
The________of monarch’s amazing ability to determine the way to go.
mystery
The serious ______ of the monarch.
trouble
The ________ of the monarch.
protection
2. Where are you most likely to find the passage?
1 In a scientific research paper about the monarch butterfly’s migration.
2 In a popular nature magazine introducing the monarch butterfly.
3 In a travel leaflet encouraging people to visit North America.
Activity 3
Read for text type
1. What type of writing is this passage?
A. Argumentation
B. Exposition
C. Narration
What does “this” refer to ?
What mystery have the scientists solved?
Why should the scientists solve the mystery?
Why does the author use “wonderful” to describe monarch’s migration?
Activity 4
Read for details
Activity 4
Read for details
Read para.3 and para.4 to complete the “cause-effect” flow charts.

d
a. The monarch butterfly is able to tell________________.
b. Using these two pieces of information, the monarch
butterfly determines _____________.
c. The monarch butterfly measures ___________________
_______with its eyes.
d. The monarch butterfly reaches ______________________
____________________.
the time of day
the way to go
the position of
the places where it

a
the sun
will spend the winter
c
b
Activity 4
Read for details
e. Humans _________ trees.
f. The ________________________________ where monarchs can be found is destroyed.
g. Humans use chemicals that ____________ that monarch caterpillars eat.
h. The monarch butterfly’s population _____________________ _________________________ in the last few years.
cut down
natural environment of many places
kill the plants
has crashed
(by as much as 90 per cent)

h
e
g
f
Activity 4
Read for details
reason 1
reason 2
phenomenon
result
Use the key words you learned from the video “Cause and Effect” to retell para.3 and para.4.
Activity 4
Read for details
Read para.5 and answer：
1. What have people been doing after a great awareness of this creature ?
2. What can we do to keep monarch’s place in the natural world for a long time to?come?
Raise people’s awareness of this creature.
Plant native milkweed to feed on.
Don’t use chemicals that kill the plants.
Protect the natural environment.
Activity 4
Read for details
Activity 5
Think and share
Why does the author use “journey” instead of “migration” ?
Journey generally refers to a process of traveling from one place to another. A journey can be physical or emotional and is often used to describe a trip or an experience that involves personal growth, exploration, or discovery.
For monarch butterfly, it is a long and difficult journey to reach the places where it will spend the winter.
For human beings, it is a journey to explore and discover the mystery and protect the species.
What should we do to protect the endangered animals or nature?
Be kind to animals
Live in harmony with nature
Be friendly to our environment
Activity 5
Think and share
Summary
The structure of the expository writing.
The importance of protecting animals and living in harmony with the nature.
How to use the flow chart to express the “cause—effect” relationship.
Protecting wildlife is protecting humans themselves!
They migrate to find food, seek a partner, or in search of warmer weather.
Language points
【语块积累】
seek to do sth. 打算/试图做某事
seek after 寻求，追求
seek for 寻找，探求
seek out 找出
【即学活用】
(1)语法填空
①He also said he would seek ____________(reduce) state spending. ?
②We are trying to seek ________the trouble spot of the instrument.
③His parents asked why he did not seek ________work.
(2)We ___________________solutions to the problems. ?
我们决定寻找这些问题的答案。
(3)We cannot change the past, but nor should we seek to hide from it.
译: ______________________________________
to reduce
out
for
determine to seek
我们不能改变过去, 也不能企图逃避过去。
【句式解构】
当句子中再次出现与前面的名词重复的名词时, 常常用that代替前面出现的单数可数名词或不可数名词, 而用those代替前面出现的复数名词。
Is the population of Beijing larger than that of Shanghai?
北京的人口比上海的人口多吗?
The students of our class are more hard-working than those of Class
我们班的学生比三班的学生更努力。
One of the most wonderful migrations in nature is that of the North American monarch butterfly.
【知识拓展】替代词that/one/it
that只指物, 不指人, 可替代可数名词或不可数名词, 指的是同类事物中另一样东西, 即同类异物, 复数用those。
one可指人或物, 只替代可数名词, 是泛指, 复数形式为ones。
it代替上文提到的名词, 指同类事物中的同一物体, 复数为they。
【即学活用】 选词填空(that/those/it/one)。
(1)In my opinion, the weather in Kunming is more pleasant than_____in Chengdu.
(2)I have lost my umbrella; I’m looking for_____.
(3)A chair made of steel is stronger than _____made of wood.
(4)His interests are very different from _____of his friends.
that
it
one
those
measure v. 测量; 量; (指尺寸、长短、数量等)量度为/ n. 措施; 方法
take measures. . . 采取措施……
【即学活用】
(1)语法填空
①The table ___________(measure) 1 metre long.
②An earthquake _____________(measure) 6. 1 struck California yesterday.
(2)We are ready to help all African countries _______ ___________(采取措施)to reduce the risks of H5N1. ?
measures
measuring
take measures
It uses its eyes to measure the position of the sun.
position n. 位置, 姿态, 观点, 处境
in a... position　　 处于……的地位/处境
in/out of position 在/不在适当的位置
take up one’s position　 就位
hold a position 担任职务
【即学活用】(1)写出下列句子中position的汉语意思。
①I’m not sure what I would do if I were in your position. ( )
②She holds the position of sales manager. ( )
③From his position on the cliff top, he had a good view of the harbour. ( )
(2)I’m sure you will make greater achievements __________________. ?
我相信你在新的工作岗位上一定会取得更大的成就。
处境
职位
位置
in your new position
(1)determine to do sth. 决定做某事(表示动作)
(2)determined adj. 坚决的; 有决心的 be determined to do sth. 决心做某事
(3)determination n. 决心
【即学活用】
(1)语法填空
①Age and experience will be ___________(determine)factors in our choice.
②They have made a __________(determine) effort to stop smoking.
(2)He ____________________his family a secure and solid base. ?
他决定给家人一个安全牢固的生活基础。
(3)They left their village, ____________________________. ?
他们离开村庄, 决心再也不回来了。
determining
determined
was determined to give
determined never to come back
-allow the butterfly to determine v. 确定; 测定
【语块积累】
the solution to. . . 　 解决方法是……
the key to. . . 关键是……
the answer to. . . 答案是……
【即学活用】
(1)语法填空
①He said that if I knew the answer _______all your questions, I’d be a genius.
② The key _______success is to be ready for the start.
(2)I do not have ______________________the drug problem. ?
我没有解决毒品问题的简易的办法。
to
to
a simple solution to
The solution to the mystery of the monarch’s amazing ability comes at a time when it is in serious trouble.
【语块积累】
amaze v. 使惊奇/ amazed adj. 惊奇的/ amazement n. 惊奇; 惊诧
to one’s amazement/to the amazement of sb. 使某人惊奇的是
in amazement 惊奇地
【即学活用】(1)用amazing的适当形式填空
①His sister stared at him in _____________.
②You’ll be __________how much more you can see.
③I enjoy the idea of building new, ________things.
(2)He survived, __ ___ __________ __ _____/__ _____ __________.
令他们惊讶的是, 他竟活下来了。
(3)They _____ _______ ____ I was talking in an Irish accent.
我说话带爱尔兰口音让他们感到很惊奇。
amazement
amazed
amazing
to the amazement of them to their amazement
were amazed that
people are destroying the natural environment.
harm
多用于有生命的东西, 指引起严重的痛苦和损伤
destroy
指彻底毁坏以至于不能或难以修复
damage
多指对无生命物体的损伤, 并有降低其价值、破坏其功能的后果
【即学活用】选词填空(harm/destroy/damage)
(1)The back of the car was ________in the accident, so I had to have it repaired.
(2)With many forests being _________, huge quantities of good earth are being washed away every year.
(3)Don’t _____your eyes by reading in strong light.
damaged
destroyed
harm
【语块积累】
(1)lead to+n. /v. -ing 导致……; 通向……
(2)lead sb. to do sth. 使某人做某事 lead sb. to/into. . . 领着某人去/进入……
lead a happy life 过着幸福的生活
(3)in the lead 带头, 处于领先地位 take the lead 带头
【即学活用】
(1)The road _______________________was busy. ?
通向镇中心的那条路很繁忙。
(2)His wrong actions could ________________his job. ?
他的错误行为会让他失去工作。
(3)These leaders ___________in helping the villagers _______________. ?
这些领导人在帮助村民过幸福生活方面起带头作用。
leading to the town centre
lead to him losing
take the lead
lead a happy life
The research on the monarch’s behavior has however led to a greater awareness of this creature.
【语块积累】
aware 　 adj. 意识到; 明白
be aware of 意识到; 知道
【即学活用】完成句子
(1)A group of students spent their summer vacation
cycling around the island, ________________________________(为了提高对全球变暖的认识). ?
(2)He is never ________(意识到)his mistake. ?
to raise awareness of global warming
aware of
The research on the monarch’s behavior has however led to a greater awareness of this creature.
【语块积累】
survive 　　 vt. 经历(地震等)而幸存; 比(某人)长命
survive from　 从……存活下来; 从……流传下来
survive on 靠……存活下来
survivor n. 幸存者 survival n. 幸存; 残存
【survive的宾语】
survive作不及物动词时, 后跟介词from或on构成短语; 作为及物动词, 表示“幸存”时, 宾语为地震、事故、袭击、疾病、霜冻等名词; 表示“比某人长命”时, 以人作宾语。
The more we know about this lovely creature, the greater the chance it will survive and keep its place in the natural world for a long time to come.
我们对这些纤弱的生物了解得越多, 它们活下来的机会就越大。
【即学活用】
用survive的适当形式填空
(1)There could be two or three of the dolphins left in the river, but they have no chance of _______.
(2)Her father was a ________. Her mother had not survived.
(3)He ________the earthquake after spending 3 days in an air pocket.
survival
survivor
survived
Then use the sentences to complete the “cause-effect” flow charts.
【语块积累】
bring/carry/put sth. into effect 实行，使生效
come/go into effect 生效，开始实行
have an effect/no effects on 对……有/没有影响
of no effect 无效
take effect 生效，起作用
in effect 事实上；在实施中
effect n. 影响；结果
【即学活用】
(1)用适当的介词填空
①Overusing will have a bad effect ___you and your study.
②It’s hard to believe that some ancient laws are still __effect.
③They did not say when the measure would come ____effect.
(2)______ ___ __ ______ _____ ___health and our ability to concentrate.
压力对健康及我们集中精力的能力有重要的影响。
on
in
into
Stress has a major effect on
1. Make a poster about the monarch butterfly.
2. Search more information about migration on the internet.
Homework