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(共35张PPT)
Unit 7
Know Our World
Lesson 38
The World Is a Big Place
How many continents are there in the world What are they
…
What do you know about the place where you live
There are many planets in the universe.
planet [ pl n t] n.行星
New words
Biological systems have been doing this for billions of years.
billion [ b l n] n.十亿；千兆
billions of 数十亿的
New words
The companies have 1,770 employees in total.
total [ t tl] n.总计；总数
adj.总的；总计的
in total 总共
New words
The company’s sales are increasing.
increase [ n kri s]
v.增加；增大
New words
surface [ s f s]
n.表面；表层
the surface of ……的表面
The surface of the sea looks calm.
New words
Indian [ nd n] adj.印度的
n.印度人
India n.印度
Many Indian girls are good at dancing.
New words
Atlantic [ t l nt k]
n.&adj.大西洋（的）
The Atlantic Ocean separates America from Europe.
New words
Arctic [ ɑ kt k] adj.北极的
Polar bears live in the Arctic part.
New words
planet
billion
total
increase
surface
Indian
Atlantic
Arctic
n. 行星
n. 十亿；千兆
n. 总计；总数 adj. 总的；总计的
v. 增加；增大
n. 表面；表层
adj. 印度的 n. 印度人
n. 大西洋（的）
adj. 北极的
New words
面对一个大问题
总计；合计；总共
迅速增长
世界人口
三分之一
地球表面的三分之二
被称为
face a big problem
in total
increase very quickly
the world’s population
one third
two thirds of the earth’s surface
be called
Expressions
被……覆盖
用……于……
被好好对待
在其他六个大洲上
be covered with…
use… for
be treated well
on the other six continents
Expressions
1. When was the world’s population over 7 billion
in total
2. When will the world have about 8 billion people
3. How many continents does the world have
4. How many oceans does the world have
In the year 2010.
Seven.
By 2025.
There are four main oceans.
Listening
How many continents and
oceans does the world have Can you point them out
Text
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,
Text
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
Text
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
Text
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!
Text
(1) billion前有数词修饰时，billion不能用复数形式。
billions of意为“数十亿的”，表示不确定的数量。
e.g. Worldwide sales reached 2.5 billion.
全球销售额达到了25亿。
There are billions of people in the world.
世界上有数十亿人。
Language points
1. In the year 2010, the world’s population was over 7 billion in total.
(2) total n. 总计；总数 adj. 总的；总计的
a total of修饰可数名词复数时，其谓语动词用复数形式。
the total of...后的谓语动词一般用单数形式。
e.g. Out of a total of 15 games, they only won 2.
在总共15场比赛中，他们只胜了2场。
In total over 1,000 people attended the conference.
共计一千多人参加了这个会议。
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……
e.g. The company has increased the number of the
products. 公司提高了产品的数量。
2. It is increasing very quickly.
one third 三分之一
分数表达法：分子用基数词，分母用序数词。分子如果大于1，分母用复数形式。
注意：
①二分之一不能说a/one second，而要说 a/one half。
②四分之一和四分之三常用a quarter和three quarters表示。
3. We can’t live in water, and only about one third of our planet is land.
③当“分数＋of+名词”结构作主语时，谓语动词的单复数取决于of后面的名词。名词为可数名词复数，谓语动词用复数；名词为不可数名词，谓语动词用单数。
e.g. One third of the students are girls in our group.
我们队三分之一的学生是女生。
Only one-fifth of air consists of oxygen．
氧气只占空气的五分之一。
treat v. 对待；看待
treat sb. as... 把某人看作……
treat/regard sb. with... 以……对待某人
e.g. They treat the dog as a member of their family.
他们把狗视作家庭的一员。
She treats every child with kindness.
她用善心对待每个孩子。
4. It must be treated well for our children and for our children’s children, too!
Paragraph 1 a. Six of the seven continents are good for
people to live on.
Paragraph 2 b. We should treat the earth well.
Paragraph 3 c. An increasing population is a big problem
for the earth.
Paragraph 4 d. Two thirds of the earth is covered with oceans.
Paragraph 5 e. People cannot live everywhere on the earth.
Read the lesson and match each paragraph with its main idea.
Reading
Let’s Do It!　
1
increase dry surface billion total
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
increasing
total　
driest
surface
billions
Fill in the blanks with the correct forms of the words in the box.
2
It is the biggest continent. It has the highest point on the earth in the Himalayas.
It is the second largest continent. Many elephants, giraffes, zebras and lions live there.
It is the third largest continent. Canada, Mexico and the U.S. are the three major countries on this continent.
It is the fourth largest continent. There are 13 countries on this continent.
It is the fifth largest continent. The South Pole is on this continent.
It is the sixth largest continent. It is a good place for people to travel to.
It is the smallest continent. You can find koalas and kangaroos there.
Match the seven continents with their correct descriptions.
3
Europe
South America
Asia
Africa
Australia
Antarctica
North America
1. The products increases _____ 2 percent on our farm.
A. to B. by C. on D. in
2. Jim is finding out how much we need _____ if we
go on a trip to Hunan.
A. in total B. in fact
C. in this way D. in the direction of
Exercises
3. _____ of the clothes are from the international
markets, so they are fashionable.
A. Two third B. Second third
C. Two thirds D. Second thirds
4. When I lived in London, the host family treated
me _____ their family member.
A. as B. for C. above D. on
5. Two _____ people go traveling last year according
to the survey.
A. billions B. billions of
C. billion of D. billion
Talk about the special places in the world.
Group work
1. Review and recite the important points of this lesson.
2. Talk about the different parts of the world.
3. Preview the next lesson.
Homework
Thank you!

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