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(共15张PPT)
冀教版八年级英语下册
Lesson 38 The World Is a Big Place
Key words & phrases:
planet; total; increase; surface; Indian; in total; one third; be covered with; two thirds.
Key sentences:
1. These dry places are called deserts.
2. The Pacific Ocean is the largest one.
3. It must be treated well for our children and for our children’s children, too!
To learn about some geographical facts of the earth.
Teaching Aims
Our Planet
How many continents are there in the world
What are they
What do you know about the place where you live
Which continent does it belong to
What's the population of your city
What's the weather like
What's the problem that your city faces
What's your advice
Free talk
Read and 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
Listening
Listen to the tape and think about the question:
What problems does the earth face
The world’s population is increasing very quickly.
People can’t live everywhere on the earth.
......
Environmental Crisis：指地球面临的环境危机
Climate Threats：指地球面临的气候威胁
Serious Problems：指地球面临的严重问题，如环境问题
Global Environmental Issues：指全球环境问题，包括全球气候变暖、臭氧层的耗损与破坏、酸雨蔓延、生物多样性减少、森林锐减、土地荒漠化、大气污染、水污染、海洋污染和危险性废物越境转移等
What should you do
The earth is our home. We must take care of it. When the land was used up or the river was not clean in a place, man went to another place.
It's best to ride bikes. When you are riding, there is no pollution. So let’s try to walk and ride bikes instead of taking cars to stop pollution and protect our world, make it a better place to live.
Retell the text according to the key words:
Group-work
seven continents
four oceans
problems
treat well
The world is a big place. Its surface is made up of land and oceans. Land covers …
The Earth is our only home, it’s our duty to protect it.
Let’s work together to take care of it and make it more beautiful!
1.In the year 2010,the world’s population was over 7 billion in total.
在2010年，世界人口总数超过了70亿。
【要点】
（1）total 作名词,意思是“总计”
（2）in total=in all:总计，合计
Eg：My family members are 20 people in total.
我家家庭成员共有20人。
Language points
2.We can’t live in water,and only about one third of our planet is land.
我们不能居住在水里，而全球只有三分之一的面积是陆地。
【要点】
(1)one third ：三分之一,也可写为one-third。
(2)分子用基数词表示,分母用序数词表示。
Eg：one fifth五分之一 two thirds三分之二
one half一半 a quarter四分之一
(3)分数+ of +名词+谓语复/单：……中的几分之几
Eg：Two fifths of the students are from China.
五分之二的学生来自于中国。
Fill in the blanks with the correct forms of the words in the box.
Excerise
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

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