Lesson 38 The World Is a Big Place-初中英语 八年级下册 冀教版 同步课件(共22张PPT)

(共22张PPT)
Unit 7 Know Our World
Lesson 38 The World Is a Big Place
1 学习目标 2 新课导入
3 新课讲解 4 当堂小练
5 课堂小结
目录
contents
Learn more about the world’s geography.
Master the words and expressions of the continents and oceans in English.
学习目标
思 考
All of us have studied geography. Can you say the names of the continents and oceans in the world
新课导入
THINK ABOUT IT
·How many continents are there in the world What are they
·What do you know about the place where you live
新课讲解
How many continents and
oceans does the world have
Can you point them out
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！
Language point 1
The earth is a very special planet, and it faces a big problem.
planet / pl n t/ n. 行星
planet 为可数名词，指环绕恒星运转的星球。
e.g. The earth is the only planet that we know has life at present.
地球是目前我们所知的唯一有生命存在的行星。
Language point 2
In the year 2010, the world’s population was over 7 billion in total.
billion / b l n/ n．十亿；千兆
billion前有数词修饰时，billion 不能用复数形式。
e.g. We want two billion. 我们想要20 亿。
billions of意为“数十亿的”，表示不确定的数量。
e.g. There are billions of stars in the sky.天上有数十亿的星星。
Language point 3
It is increasing very quickly.
increase既可作及物动词也可作不及物动词，其反义词为decrease。也可作名词，常用短语on the increase“正在增加；不断增长”。
e.g. These cases are on the increase.这些案件在不断增加。
e.g. His power increased.他的权利加强了。
increase/ n'kri s/v.增加；增大
Language point 4
Antarctica is covered with snow and ice all year round.
主动结构为：cover...with...(用……盖住……)
e.g. Please cover this desk with a cloth. 请用布盖住这张课桌。
be covered with 被……覆盖
e.g. Our garden is covered with grass and flowers.
我们的花园被花草覆盖着。
1
Read the lesson and match each paragraph with its main idea.
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.
Fill in the blanks with the correct forms of the words in the box.
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
2
一、词语运用
1. The s________ of the lake is quite still.
2. The t________ cost will be 130 dollars.
3. The earth is a p________and it goes around the sun.
4. They come from India, and they are I________.
5. The number of wild pandas has i________ by around 17% in
the last ten years.
urface
otal
lanet
ndians
ncreased
当堂小练
二、连词成句
1. planet, earth, is, special, the, a
__________________________________________________.
2. in, we, live, water, can't
__________________________________________________.
The earth is a special planet
We can't live in water
3. deserts, dry, called, these, places, are
__________________________________________________.
4. must, earth, well, the, treated, be
__________________________________________________.
5. cover, surface, thirds, the, oceans, two, earth's, of
__________________________________________________.
These dry places are called deserts
The earth must be treated well
Oceans cover two thirds of the earth's surface
重点单词：increase,planet ,billion
重点短语：be covered with,
重点句子：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.
Antarctica is covered with snow and ice all year round.
课堂小结
感 谢 观 看