UNIT7 Lesson 38 教学课件--冀教版初中英语八年级下

(共27张PPT)
Lesson 38: The World Is a
Big Place
UNIT 7 Know Our World
学 习 目 标
掌握单词：planet, total, increase, surface, Indian
接触单词：billion, Atlantic, Arctic
短语和句型：point out, in total, be covered with
These dry places are called deserts.
1
3
更多地了解地球，更好地对待和保护我们生活的地球。
运用所学的知识介绍地球的一些基本情况。
2
New Words
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
increase　　dry　　surface　　billion　　total
increasing
total
driest
surface
billions
Langage use
Think about it!
How many continents are there in the
world What are they
What do you know about the place
where you live
Oceans cover about three-quarters of the earth’s surface.
课 堂 导 入
desert
Deserts cover twenty percent of the earth’s surface.
What’s the world’s biggest island
The world’s biggest island is Greenland. Greenland is northeast of Canada.
Greenland
Listening
Listen to the tape and you need to pay attention to your pronunciation.
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.
Read and match
Match the seven continents with their correct descriptions.
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.
Europe
South America
Asia
Africa
Australia
Antarctica
North America
Europe
South America
Asia
Africa
Australia
Antarctica
North America
Practice
1. Can you point them out
point out指出，说明
例：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
Language points
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。
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。
例: You should face the challenge bravely.
你应该勇敢地面对挑战。
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七十亿。
(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。
例: 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……
例: His sister has three hundred stamps in total.
他的姐姐总共有三百张邮票。
Our class has a total of 60 students.我们班总共有60人。
4. It is increasing very quickly.它正在非常迅速地增长。
increase v．增加；增大。
例：The number of the students in our school is increasing.
我们学校学生的数量正在增长。
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九十亿。
by 2025 意为“到2025年为止”。
by在这里意为“到……为止”。
例: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。
例：one fifth 五分之一；one fourth 四分之一；three eighths 八分之三。
②特殊表达法。
如：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……)
例：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。
例：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。
在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。
例: 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。
1. Learn some new words and expressions.
2. Review the present perfect tense.
3. Master the passive voice.
Sum up
课 堂 达 标
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
1. Recite the words and phrases in this lesson.
2. Complete the related exercises.
3. Preview next lesson.
Homework
Thank you !