外研版（2019）必修第一册Unit 5 Into the wild Understanding ideas 课件-（49张PPT）

(共49张PPT)
Understanding ideas
Unit 5 Into the wild
What are the relationships between the people and the animals
blind people and guide dog
(life assistant)
B. pet owner and pet
C. horseman and horse
(competition companion)
D. owner and livestock
B
A
C
D
What animals do you often interact
with What is your relationship with
them
Humans and animals are friends.
There are also some animals in the wild.
Guess what they are doing.
migrate
/ma 'gre t/
Animal migration refers to the movement of a species from one habitat to another in response to seasonal changes to the environment. Often covering great distances and involving huge numbers of animals, it can be fascinating to observe. Migration happens in all parts of the animal kingdom, from fish and insects to birds, reptiles and mammals.
Are they the animals that migrate
a
b
c
monarch butterfly
/ m n k/
Siberian crane
/sai'bi ri n/
Atlantic salmon
/ t l nt k/
Are they the animals that migrate
red panda
killer whale
African lion
d
e
f
a
monarch butterfly (黑脉金斑蝶)
The monarch butterfly is a kind of beautiful insect with fine black and orange wings.
The monarch usually has a lifespan of 6 weeks, and its
hometown is mainly in America.
Video : monarch butterfly
Now let’s learn more about the monarch butterfly. (P50-51)
Read for the main idea of each paragraph and the passage structure.
Find out what mystery the scientists have solved.
Think about where you are most likely to find the passage.
Read and Think
Read for the main idea of each paragraph and the passage structure.
Para. 1
Para. 3
Para. 4
Para. 2
Para. 5
a. Measures to protect the monarch
b. Definition of animal migration
c. Reasons for the monarch’s trouble
d. Details about the monarch’s migration
e. Ways that the monarch migrates
Part I The migration of monarch butterfly
Part II The influence of human’s activities on
monarchs
Find out what mystery the scientists have solved.
The scientists have solved the mystery of how monarch butterflies manage to travel a long distance and find their way to their destination.
Think about where you are most likely to find the passage.
In a scientific research paper about the monarch
butterfly’s migration.
B. In a popular nature magazine introducing the
monarch butterfly.
In a travel leaflet encouraging people to visit
North America.
Many animals move from one place to another at certain times of the year. This annual movement is called migration. They migrate to find food, seek a partner, or in search of warmer weather. One of the most wonderful migrations in nature is that of the North American monarch butterfly.
Why do animals make a migration
What does that refer to
Read and Answer
Para. 1
annual adj. 年度的，每年的
migrate=make a migration
词块：in search of 寻找，寻求……
1
2
Every autumn, millions of these beautiful insects with fine black and orange wings begin a long and difficult journey. Somehow they manage to travel around 4,000 kilometres south and find their way to California or Mexico. However, until recently no one knew how they did this.
Read and Answer
Para. 2
About the journey:
When How How long Route
Route
Para. 2
A team of scientists led by Professor Eli Shlizerman at the University of Washington has now found the answer. They have found out that the monarch is able to tell the time of day. It uses its eyes to measure the position of the sun. These two pieces of information – the time of day and the point where the sun is in the sky – allow the butterfly to determine the way to go. Eventually, it manages to reach the places where it will spend the winter.
Para. 3
Read and Answer
Complete the sentences with expressions from this paragraph and the “cause-effect” flow charts. (P52)
Para. 3
a. The monarch butterfly is able to tell 1_______________.
b. Using these two pieces of information, the monarch
butterfly determines 2 ______________.
c. The monarch butterfly measures 3________________
_____with its eyes.
d. The monarch butterfly reaches 4 __________________
____________________.
the time of day
the way to go
will spend the winter
the places where it
the position of the
sun
d
a
b
c
cause
effect
The solution to the mystery of the monarch’s amazing ability comes at a time when it is in serious trouble. Its population has crashed by as much as 90 per cent in the last few years. Sadly, human activity is the main reason why the number of monarch butterflies is falling. In many of the places where the butterfly can be found, people are destroying the natural environment. They cut down trees and use chemicals that kill the plants that monarch caterpillars eat.
Para. 4
Read and Answer
Complete the sentences with expressions from this paragraph and the “cause-effect” flow charts. (P52)
Brainstorm other factors that destroy the monarchs’ habitat.
crash 原义为“碰撞；瘫痪；（股市或股票）暴跌”，文中用来说明帝王斑蝶的数量急剧下降
Para. 4
h
e
f
g
cause
effect
e. Humans 5 ______________ trees.
f. The 6 _________________________________ where
monarchs can be found is destroyed.
g. Humans use chemicals that 7 ______________ that
monarch caterpillars eat.
h. The monarch butterfly’s population 8 _____________
__________________ in the last few years.
cut down
natural environment of many places
kill the plants
has crashed
(by as much as 90%)
Other factors that destroy the monarchs’ habitat.
factors
deforestation
high quantity of exhaust gases
urbanization
forest fire
overpopulation
food shortage
The research on the monarch’s behaviour has however led to a greater awareness of this creature. People have been working together to record its migration and make sure that there are
enough plants for it to feed on. If this works, there may come a time when the number of monarch butterflies increases once again. 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.
Read and Answer
1.What measures are taken to protect monarch butterflies
2. Why do people make the research Is it useful
Para. 5
2
1
Think Share
What impresses you most about the monarch
butterfly
What can people do to help protect the monarch
butterfly
Important words
1. seek (seek → sought → sought)
seek (for) sth. / sb. 寻找某物 / 某人
seek one’s fortune 外出寻找发财机会,闯世界
If you want to seek for success, you must work hard.
seek to do sth = try to do sth 试图做某事，设法做某事
We are always seeking to improve productivity.
① vt. & vi. 寻找,寻求,谋求,请求
② v. 试图，设法
如果你想寻求成功，你必须努力工作。
我们一直在努力提高生产率。
将下列句子补充完整。
Thousands of people squeezed into the building, ________ (seek) protection from the rain.
The answer to the question must _________ (seek) elsewhere.
We are seeking ____ the solutions to current problems.
Exercise
seeking
be sought
for
1)
2)
3)
Important words
2. measure
measure... by... 用……来衡量……
be measured by / in 用……来衡量/计算
It’s generally acknowledged that education shouldn’t
______________________________________________.
人们普遍认为教育不应该仅仅用考试成绩来衡量。
The pond _________ about 2 metres __________.
这个池塘宽约2米。
① vt. & vi.（长度）为；测量；衡量
be measured only by examination results
measures
across
Important words
Therefore, it’s high time we took measures to prevent water from being polluted.
因此，是我们采取措施防止水被污染的时候了。
The suit fits me well because it was made to my measure.
这套衣服很适合我，因为它是按我的尺寸做的。
② n. 计量单位；措施；尺寸
take measures to do sth 采取措施做……
make sth to sb’s measure 照某人的尺寸做某物
将下列句子补充完整。
Some villagers reported a huge snake, __________ (measure) over two meters long, was found dead in a nearby cave.
Exercise
measuring
“measure”作动词，表示“有……长 / 宽 / 高”时，为不及物动词，不用于被动和进行时态，若其短语作后置定语，要用v-ing形式。
Important words
3.
determine to do sth [正式用语]决心做某事
be determined to do sth 决心做某事 (adj.)
determination n 决心，决定
He determined to get ahead of the others in studies.
他决心在学习上超过别人。
determine vt. & vi. 确定，决定
Important words
survive sb by… 比某人活的长……
survive on sth 靠某物而生存下来
4. survive vi. 幸存，生存下来，比……活得长
vt. 经历……之后还存在
她比她丈夫多活了十年。
She survivd her husband by ten years.
survival n. 幸存，残存物 survivor n.幸存者
单句改错
Exercise
He felt lucky to have survived from the war.
“survive” 表示“从地震、火灾、事故等中幸存下来”时，为及物动词，不可接介词in或from。
Important lexical chunks
1 at certain times
2 in search of
3 millions of
4 manage to do sth
5 find one’s way to
6 find out
7 the solution to...
在某些时候
寻找，搜寻
数百万
想法设法做成某事
找到去……的路
发现，查明真相
……的解决方法
Important lexical chunks
8 in trouble
9 in the last few years
10 the number of...
11 cut down
12 lead to
13 feed on
处于困境中
在过去几年里
……的数量
砍伐
导致
以……为食
One of the most wonderful migrations in nature is that of the North American monarch butterfly.
Important sentences
本句中的“that”是代词，用来特指前面所提到的名词。that作代词时，它所指代的名词可以是可数名词，也可以是不可数名词。这一用法可以让句子更加简洁，避免重复与累赘。
One of the most wonderful migrations in nature is the migration of the North American monarch butterfly.
Paraphrase
将下列句子译为汉语。
1) I can’t lend my bike to you, for Tom is using it.
2) The population of China is larger than that of the UK.

我的自行车不能借给你，因为Tom在用。
中国的人口数量比英国多。
Exercise
(it指上文中的my bike，是同一个事物)
（that指上文中的population，同类但不同物)
These two pieces of information — the time of day and the point where the sun is in the sky — allow the butterfly to determine the way to go.
Important sentences
2.
The butterfly is aware of the time of day and the position of the sun in the sky, so it can use these two pieces of information to find out which way to go.
句中的where the sun is in the sky为关系副词where引导的定语从句，修饰先行词 the point，where在定语从句中用作地点状语。
Paraphrase
将下列含有“where”的句子译为汉语。
Eventually, it manages to reach the places where it will spend the winter.
Exercise
1)
最后，它成功到达了它要过冬的地方。
After the war, a new school was put up where there had once been a theatre.
战后，一所新学校在曾经是剧院的地方建立起来。
2)
In many of the places where the butterfly can be found, people are destroying the natural environmnet.
在很多可以找到黑脉金斑蝶的地方，人们正在破坏自然环境。
3)
where引导定语从句，修饰the places
where引导的地点状语从句，相当于at the place
where引导定语从句，修饰the places
3. The solution to the mystery of the monarch’s amazing
ability comes at a time when it is in serious trouble.
Important sentences
句中的when it is in serious trouble为关系副词when引导的定语从句，修饰先行词 a time，when在定语从句中用作时间状语。
People solved the mystery of the monarch’s amazing ability at the same time that the monarch is facing a serious and difficult situation.
Paraphrase
当我到学校时，校园里还是静悄悄的，我决定先去探寻一番。
如果这个做法起作用，黑脉金斑蝶的数量有望再次回升。
将下列含有“when”的句子译为汉语。
Exercise
If this works, there may come a time when the number of monarch butterflies increases once again.
1)
when 引导定语从句，修饰先行词a time
The campus was still quiet when I arrived, so I decided to explore a bit.
2)
when引导时间状语从句
Sadly, human activity is the main reason why the number of monarch butterflies is falling.
Important sentences
可悲的是，人类的活动是黑脉金斑蝶数量急剧下降的主要原因。
4.
句中的why the number of monarch butterflies is falling为关系副词why引导的定语从句，修饰先行词 reason，why可以换成for which，在定语从句中用作原因状语。
将下列句子补充完整。
汤姆开会迟到的原因是因为他生病了。
Tom came late for the meeting. That was ________ he was ill.
The reason ________ Tom came late for the meeting was ________ he was ill.
because
why
that
Exercise
1)
2)
They cut down trees and use chemicals that kill the plants that monarch caterpillars eat.
Important sentences
他们砍伐树木并且使用化学剂，该化学剂能杀死黑脉金斑蝶幼虫吃的植物。
5.
本句中的两个that 均引导定语从句。其中，第一个that指代chemicals，在从句中作主语；第二个that指代plants，在从句中作eat的宾语，这时that也可省略。
People have been working together to record its migration and make sure that there are enough plants for it to feed on.
Important sentences
人们一直都在共同努力，记录它的迁徙并且确保有足够的植物供它采食。
6.
本句中to record its migration作目的状语。that引导宾语从句，作make sure的宾语，这时that也可省略。
Exercise
When asked why he went there, he said he was sent there ______ for a space flight.
training
being trained
C. to have trained
D. to be trained
D
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.
Important sentences
7.
句中的 the more…, the more… 是固定搭配，结构为：the + 比较级，the + 比较级，译为：越……，越……。
When we know more about this lovely creature, the chance of it surviving and keeping its place in the natural world for a long time to come will increase.
Paraphrase
将下列句子译为英语。
The harder you work, the luckier you’ll be.

她越想这事就越沮丧。
越努力，越幸运。
Exercise
1)
2)
The more she thought about it, the more depressed she became.
Writing
Organise the information we talked about in post-reading and write a letter within 100 words to appeal to people to focus on the serious
situation of the monarch butterfly and protect them.
Thank You!