冀教版八年级下册Unit 7 Know Our World Lesson 38 The World Is a Big Place课件(共36张PPT)

(共36张PPT)
Lesson 38: The World Is a Big Place
Unit 7 Know Our World
单词：planet, total, increase, surface, Indian, billion, Atlantic, Arctic, British
短语：point out, in total, one third, be covered with
句子： (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!
学习并积累一些与地球、地理、七大洲、五大洋等相关的词汇和表达；掌握分数的表达方法。
Learning Goals
1
2
Free Talk
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
Presentation
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!
New words
planet
billion
total
increase
surface
Indian
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
Let's do it!
2. Fill in the blanks with the correct forms of the words in the box.
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
increase dry surface billion total
Let's do it!
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.
Let's do it!
3. Match the seven continents with their correct descriptions.
Europe
South America
Asia
It is the biggest continent. It has the highest point on the earth in the Himalayas.
It is the sixth largest continent. It is a good place for people to travel to.
It is the fourth largest continent. There are 13 countries on this continent.
Africa
Australia
Antarctica
North America
It is the second largest continent. Many elephants, giraffes, zebras and lions live there.
It is the smallest continent. You can find koalas and kangaroos there.
It is the fifth largest continent. The South Pole is on this continent.
It is the third largest continent. Canada, Mexico and the U. S. are the three major countries on this continent.
Language points
1. Can you point them out 你能指出它们吗？
point out指出，说明
※ He pointed out the dangers of driving alone.
他指出了单独开车的危险性。
※ Can you point out the mistakes in this picture
你能指出这张图片中的错误吗？
拓展：point at指着
2. The earth is a very special planet, and it faces a big problem. 地球是一颗很特殊的行星，它（现在）面临着一个大问题。
(1) face v.面临；面对
此处作及物动词，后面可接人或表示困难、形势、问题等的抽象名词或动名词作宾语。
※ You should face the challenge bravely.
你应该勇敢地面对挑战。
(2) planet n.行星。为可数名词，指环绕恒星运转的星球。
※ 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。
3. In the year 2010, the world’s population was over 7 billion in total. 在2010年，世界人口数量总计超过了70亿。
(1) billion n.十亿。其复数形式为billions。当其前有具体的数词时，用单数形式，表示确数；当其前没有数词或由some, several, many等词修饰时，用复数形式，且其后要接介词of，表示概数。类似用法的词还有hundred(百)，thousand(千)，million(百万)等。
※ This company earns two billion dollars a year.
这家公司一年赚20亿美元。
※ Billions of stars twinkled in the sky.
无数的星星在天空中闪烁。
(2) in total意为“总计，合计，总共”，相当于in all。
a total of… 总数为……
※ His sister has three hundred stamps in total.
他的姐姐总共有300张邮票。
※ Our class has a total of 60 students.
我们班总共有60名学生。
4. It is increasing very quickly. 它（世界人口）正在迅速地增长。
increase v.增加；增大。
也可作名词。反义词为decrease。常用短语on the increase“正在增加；不断增长”。
※ These cases are on the increase.
这些案件在不断增加。
※ His power increased.
他的权力加强了。
辨析：increase by 与increase to
※ The population of this city has increased by 5 percent.
这个城市的人口增长了5%。
※ Our coal output has increased to 6 million tons this year.
我们今年的煤产量增加到了六百万吨。
① increase by ＋倍数或百分数，表示“增加了……倍或百分之……”。
② increase to ＋具体增长后的数字，表示“增加到了……”
5. And by 2050, the world’s population may reach 9 billion. 并且到2050年，世界人口可能会达到90亿。
by 2050意为“到2050年为止”。
by在这里意为“到……为止”。
※ Will you finish it by 10:00 p.m.
晚上十点前你能完成它吗？
6. We can’t live in water, and only about one third of our planet is land. 我们不能住在水里，并且我们的地球只有大约三分之一的地方是陆地。
one third是分数，意思是“三分之一”。
分数表达法：
①基本表达法
分子用基数词，分母用序数词；当分子大于1的时候，分母使用复数形式。
one fifth 五分之一；one fourth 四分之一；three eighths 八分之三
②特殊表达法
a half 二分之一；a quarter 四分之一；three quarters 四分之三
注意：当分数在句中作主语的时候，若后面的名词是复数，则谓语动词用复数；若后面的名词是单数或不可数名词，则谓语动词用单数。
7. Antarctica is covered with snow and ice all year round. 南极洲终年被冰雪覆盖。
(1) be covered with 被……覆盖。其主动结构为：cover…with…(用……盖住……)
※ Our garden is covered with grass and flowers.
我们的花园被花草覆盖着。
※ Please cover this desk with cloth.
请用布盖住这张课桌。
(2) all (the) year round 全年，整年。它相当于all over the year。
※ It’s open all year round to visitors.
它全年都对游客开放。
8. The earth is our home now，and it will be our home in the future. 现在地球是我们的家，在将来它仍是我们的家。
辨析: in the future与in future
① in the future将来，未来。它所表示的将来是指以后的将来，并不强调从说话的这一刻开始。
② in future 今后。它强调从说话时开始的以后，相当于from now on。
9. It has the highest point on the earth in the Himalayas. 它拥有位于喜马拉雅山脉上的地球上的最高点。
该句运用了形容词的最高级结构。
三者或三者以上的人或物进行比较时，用最高级。
形容词的最高级前面要加定冠词the，副词最高级前面的the可以省略。
在含有最高级的句子中，常有一个in / of短语来表示比较范围。
※ I am the tallest in our class.
我是我们班里个子最高的。
※ My movements are the most graceful of us three.
三个人中我的动作是最优雅的。
10. It must be treated well for our children and for our children’s children, too!
情态动词的被动语态
本句中must be treated是含情态动词的被动语态，其结构为“情态动词(should, must, may, can, could等)＋ be ＋动词的过去分词”。
treat v.对待；看待……
常用结构：
treat sb. as... 把某人看作……
treat / regard sb. with...以……对待某人
※ 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。
Practice
I.用所给词的适当形式填空。
1. This book is ________(difference) from that one.
2. The continent ________(cover) more than 44 million square kilometers.
3. Tell him ________(be) quiet in the reading room.
4. Which is the world’s ________(two) smallest continent
5. He ________ (say) it’s good for you.
different
covers
to be
second
says
II.根据汉语或首字母提示，完成单词
1. The biggest ocean in the world is the P_______ Ocean.
2. Almost everyone knows the e_____ goes around the sun.
3. Deserts may cover three _________ (百分比) of the earth’s surface.
4. The population of the world is __________ (增长) quickly.
5. Hainan is the second-largest _________ (岛屿) in China.
6. After half a month at sea, we saw ____(陆地).
land
acific
arth
percent
increasing
island
III.用适当的介词填空。
1. _____ 2025, the world will have 7.8 billion people.
2. Milk is good _________ children.
3. The Nile River is the longest river _________Africa.
4. Which part _________ the world do you live in
5. _________ the surface of the earth, there is some dry land.
On
By
for
in
of
Sum up
1. The new words：
planet, total, increase, surface, Indian, billion, Atlantic, Arctic, British
2. Important phrases:
point out, in total, one third, be covered with
3. Important 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!
Homework
1. Remember the new words and expressions learnt in this lesson.
2. Preview Lesson 39.