Unit 7 Lesson 38 The World Is a Big Place 课件(共26张PPT) 2023-2024学年冀教版英语八年级下册

(共26张PPT)
Unit 7
Lesson 38 The World Is a Big Place
新课导入
Asia
Europe
North America
South America
Africa
Antarctica
Australia
The continents of the world
Review
1.能熟悉并能正确运用本课时的重点单词和短语
2.能掌握关于世界人口,七大洲和四大洋的知识
预习检测
1.The lights must 　　　　before you leave the classroom.
A.turn on B.turn off C.be turning on D.be turned off
2.About 　　　　of the world is ocean.
A.two third　B.two thirds　C.two three　 D.two threes
D
B
3.There are 50 students in our class_______.
A.in total B.at all C.in turn D.at total
4.The school________Guang Ming Middle school.
A.is call B.called C.is called D.calls
5.Some students play football, ______play basketball.
A.other B.others C.the other D.the others
A
C
B
知识梳理
1. 年份的读法：
一般把表示年份的四位数字按前后分为两组，每一组的数字用基数词来读。
2010读作：twenty ten ；
2025读作：twenty twenty-five；
2050读作：twenty fifty；
by 2025 by: 到……之前；不迟于
hundred, thousand, million, billion这些都是计数单位，与具体数字连用不加s，除非短语hundreds of, thousands of, millions of;billions of表示不具体数目加s。
2. in total = in all 合计; 总计
the total of 大量; 许多 (谓单)
a total of +可数名词复数 (谓常用复)
强化:
Over 1,000 people attended the meeting in total.
A total of twenty letters______ received last month.
were
3. increase 增加;增大;增长; 增强
increase by +倍数/ 百分数 “增加了…倍/百分之…”
increase to +具体数字 “增加到…”
强化: The company has _________ the price of its cars.
公司提高了汽车的价格.
The number of the laptop____________ 25% last year.
The population has __________(from 300,000) ____ 70,000,000.
increased
increased by
increased
to
4. By 2025, the world may have about 8 billion people.
by + 将来时间 (用将来时)
by + 过去时间 (用过去完成时)
强化: ____ you finish doing the work by next Sunday
We ___________(learn) 1500 new words by 2013.
Will
had learned
5. 基本分数表达:
(1)基数/序数(基为子,序为母) 如:1/5 one fifth 1/9 one ninth
(2)分子> 1, 分母用复数 如: 2/5 two fifths 7/9 seven ninths
特殊分数表达: half 一半 quarter 四分之一
如:1/2 one half 1/4 a quarter 3/4 three quarters
强化: __________(四分之一)of us have left our pictures home.
________ (一半) of us are from North China.
注: 分数+ of + 可数名词复数 (谓复) 分数+ of + 不可数名词 (谓单)
强化: ___________ (三分之二)of information is true.
_____________(五分之三) of the students _____ girls in our school.
A quarter
A half
Two thirds
Three fifths
are
6. luckily 幸运地
unluckily 不幸地
例：He fell off the motorcar. Luckily, he wasn’t badly hurt.
他从摩托车上摔下来。幸运地是，他伤得不重。
luck n. 运气
lucky adj. 幸运的，既可以作表语，也可以作定语。
例：Good luck to you!
祝你好运！
He is a lucky dog.
他是个幸运的家伙。
常放在句首
THINK ABOUT IT
How many continents are there in the world What are they
What do you know about the place where you live
How many continents and
oceans does the world have
Can you point them out
了解七大洲和四大洋
The earth is a very special planet, and it faces a big problem. In the year 2010, the world’s population was over 7 billion in total. It is increasing very quickly. By 2025, the world may have about 8 billion people. And by 2050, the world’s population may reach 9 billion.
There is another problem. People can’t live everywhere on the earth. We can’t live in water, and only about one third of our planet is land. But parts of this land are very dry. These dry places are called deserts. Some areas have very high mountains. Others have a lot of snow and ice. It is not easy to live in those places.
There are seven continents: Asia, Africa, Australia, Antarctica, Europe, North America and South America. Antarctica is covered with snow and ice all year round. Luckily, people can live on the other six continents. On these continents, there are green forests, fresh water and rich lands.
Oceans cover two thirds of the earth’s surface. The earth has only one big ocean, but we use these names for its different parts: the Pacific Ocean, the Indian Ocean, the Atlantic Ocean and the Arctic Ocean. The Pacific Ocean is the largest one.
The earth is our home now, and it will be our home in the future. It must be treated well for our children and for our children’s children, too!
1. Read the lesson and match each paragraph with its main idea.
Paragraph1
a. Six of the seven continents are good for
people to live on.
Paragraph2
b. We should treat the earth well.
Paragraph3
c. An increasing population is a big problem
for the earth.
Paragraph4
d. Two thirds of the earth is covered with oceans.
Paragraph5
e. People cannot live everywhere on the earth.
1)．The number of swimmers here is _________ quickly
because it’s very hot these days.
2)．The school has a _____ of 900 students.
3)．I think it may be the ______ season of the year.
4)．The ______ of our body is skin. It protects us.
5)．How many ________ of people are there in the world now
2. Fill in the blanks with the correct forms of the words in the box.
increase dry surface billion total
increasing
total
driest
surface
billions
3.Match the seven continents with their correct descriptions.
活动小结
1. There are ______ continents in the world. They are _______________________________________________________.
2. There are _____ oceans in the world. They are ____________________________ ___________________________.
seven
four
Asia, Europe, Africa, North America, South America, Australia, Antarctica
the Atlantic Ocean， the Pacific Ocean，
The Arctic Ocean，the Indian Ocean
主动语态和被动语态的转换
1. Many students study English.
English is studied by many students.
2.They made shoes in that factory.
Shoes were made by them in that factory.
观察并分析以上两组句子，总结主动语态变被动语态的方法
by many students.
1.Many students study English.
English
is studied
2.They made shoes in that factory.
Shoes
were made
by them
in that factory.
通过观察，我们发现将主动语态变为被动语态需要三步:
1. 。
2. 。
3. 。
原宾语变主语
动词变为be+动词过去分词
原主语由by连接
将下列句子由主动语态变为被动语态
1. They will play football on this Sunday.
2. Lucy did the homework in the evening.
3. They often use computers in class.
4. We have made these machines in Beijing before.
Football will be played by them on this Sunday.
The homework was done by Lucy in the evening.
Computers are often used by them in class.
These machines have been made (by us) in Beijing.
练习巩固
活动小结
主动语态变为被动语态:
1. 。
2. 。
3. 。
原宾语变主语
动词变为be+动词过去分词
原主语由by连接
当堂检测
in total; on the earth; in the future; be covered with ; be treated well
Once the world _________________ green plants and the living things led a peaceful life _____________. However, later some animals ___________________ and was even killed for money. There are not many ________. Luckily, people are trying to save the animals in danger now. We all hope that all the living things will live a pleasant life as before ____________.
was covered with
on the earth
were not treated well
in the future
一.选择方框内正确短语填空
in total
二、连词成句。
1. one, of, Danny, cake, third, ate, the
______________________________________________.
2. easy, desert, it's, to, in, not, live, the
______________________________________________.
3. finish, next, you, the, doing, Sunday, will, work, by
______________________________________________
4. Arctic, world, is, the, Ocean, smallest, in, the, the
______________________________________________.
5. earth, is, population, problem, a, our, increasing, for, the
______________________________________________.
Danny ate one third of the cake
It's not easy to live in the desert
Will you finish doing the work by next Sunday
The Arctic Ocean is the smallest in the world
The increasing population is a problem for our earth
Unit 7
Lesson38
重点短语：
face a big problem
in total
increase very quickly
the world’s population
one third of -----
two thirds of the earth’s surface
be called ---
be covered with ----
use --- for 被用于 be used for
be treated well
on the other six continents
重点单词：
planet n.
billion n.
total n.
increase v.
surface n.
Indian adj. & n.
Atlantic n.
Arctic n.
increase v.
land n.
earth n.
surface n.
percent n.
island n.
Greenland n.
Nile n.