(共16张PPT)
Lesson 38
The World Is a Big Place
All of us have studied geography. Can you say the names of the continents and oceans in the world
The Pacific Ocean
The Indian Ocean
The Atlantic Ocean
The Arctic Ocean
1. How many continents are there in the world What are they
2. What are the four main oceans in the earth
3. What do you know about the place where you live
Listen to the lesson and answer the question:
Listening:
1.When was the world’s population over 7 billion in total
In the year 2010.
2.When will the world have about 8 billion people
By 2025.
3.When may the world’s population reach 9 billion
By 2050.
4.How many continents does the world have what are they
There are seven continents.
5.How many oceans does the world have what are they
There are four main oceans.
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.
Reading!
a. Six of the seven continents are good for people to
live on.
Reading:
Read the lesson again and repeat.
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.
Reading:
Read the lesson again and repeat.
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!
Language points:
Grammar:
1.In the year 2010, the world’s population was over 7 billion in total.
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。
We want two billion. 我们想要20 亿。
There are billions of stars in the sky.
天上有数十亿的星星。
Hundreds of people were killed in the earthquake.
地震中有数百人丧生.
2.total / t tl/ 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. A total of twenty letters were received last month.
上个月共收到20 封信。
You can choose four out of the total number.
你可以从总数中选出四个。
In total over 1, 000 people attended the conference.
共计一千多人参加了这个会议。
Language points:
Grammar:
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.
4.We can’t live in water, and only about one third of our planet is land.
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;
四分之一和四分之三常用a quarter 和 three quarters 表示
2.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。
小试牛刀：
1. （三分之二的）the earth’s surface is covered
with water.
2. of the students in our class like English.
A.Three fifith B.Third five
C. Third five D.Three fifths
D
Two thirds
5.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)
小试牛刀：
_____ you finish doing the work by next Sunday
We ______________(learn) 1500 hundred new words by 2013.
6.It must be treated well for our children and for our children’s children, too!
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。
面对一个大问题
总和
迅速增长
世界人口
---的三分之一
地球表面的 三分之二
被称为
被覆盖
用---于---
被好好的对待
在其他六个大洲上
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
Key phrases we learn today:
