(共18张PPT)
Know our world
Unit 7
The World Is a Big Place
Lesson 38
All of us have studied geography. Can you say the names of the continents and oceans in the world?
The earth is a very special planet.
planet n 行星.
The population of the world will be over 7 billion.
billion 十亿，千兆
It is increasing very quickly.
increase 增加
Oceans cover 71% of the earth’s surface.
surface n 表面
These Indian women are very beautiful in their Sari.
Indian adj印度的
n印度人
planet n. 行星
billion n. 十亿；千兆
total n. 总计；总数
adj. 总的；总计的
increase v. 增加；增大
Indian adj. 印度的 n. 印度人
Atlantic n.&adj. 大西洋（的）
Arctic adj. 北极的
word study
Read the lesson and match each paragraph with its main idea.
Task Reading
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.
1. What is the problem the earth faces?
2. People can live on the seven continents. ( ) (T/F)
3. How much of the world is covered with land?
4. What is largest part of the ocean ?
The population is increasing very quickly.
F
One third .
The Pacific Ocean.
Listen to the passage and then answer the questions.
Listening
Language points
1.In the year 2010, the world’s population was over 7 billion in total. 2010年世界总人口超过10亿。
total n 总计，总数
adj 总的，总计的
in total 总计，总共，同义短语 in all
There are 2 thousand students in total .
He thought he was a total fail .
He can’t trust anyone totally.
Why should we trust a total stranger?
The total population of Japan is smaller than that of China.
The school has a total of 900 students.
2.It is increasing very quickly.它增长的非常快。
increase v 增加，增长，反义词为decrease。
eg：Wide reading will increase your vocabulary.
His power increased.
辨析increase by与increase to
increase by increase by＋倍数或百分数，表示“增加了……倍或百分之……”。
The population of this city has increased by 5 percent.这个城市的人口增长了5%。
increase to increase to＋具体增长后的数字，表示“增加到了……”。
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.—The price of food, drinks and clothes ________
so quickly these years.
—Oh, no, but I don’t think so.(荆门)
A．develops B．raises
C．improves D．increases
2. The temperature increased ______ 37 degrees.
Compared with last year, our coal output has increased ______ three times.
D
to
by
3.Only one third of our planet is land.
Oceans cover two thirds of the earth’s surface.
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。
提示：1) 二分之一习惯上用a/one half;
四分之一和四分之三常用a quarter和 three quarters 表示。
eg：Two thirds of the students in our class are girls.
我们班三分之二的学生是女生。
2)当分数＋of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.
Three quarters of the information is true.
二分之一___________ 三分之一______________
三分之二 ___________ 四分之三_____________
五分之二____________ 五分之四_______________
1)Two ______ (three) of the apples in the basket ____(be) bad。
2）Half of the apple ______(be) bad.
3） _____ of the students in our class ____going to summer camp in Beijing next week.
A Two fifths; is B Second fifths; are
C Second fifths; is D Two fifths; are
4）_______ of the students in Class 6 have lunch at school. (
A．Two fifth B．One thirds
C．Three fifth D．Three quarters
a half
one third
two thirds
three quarters
two fifths
four fifths
thirds
are
is
D
D
4.It must be treated well for our children and for our children’s children , too!
为了我们的子子孙孙它必须被善待。
被动语态基本结构： be+过去分词
含有情态动词的被动语态构成：
情态动词+be+过去分词
2) Fill in the blanks with the correct forms of the words in
the box.
Let's Do It !
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
3) Match the seven continents with their correct descriptions.
Let's Do It !
It is the biggest continent. It has the highest point
on the earth in the Himalayas.
Europe
South America
Asia
Africa
Australia
Antarctica
North America
It is the smallest continent. You can find koalas and
kangaroos there.
It is the sixth largest continent. It is a good place for people to travel to.
It is the fifth largest continent. The South Pole is on this continent.
It is the fourth largest continent. There are 13 countries
on this continent.
It is the third largest continent. Canada, Mexico and the
U．S. are the three major countries on this continent.
It is the second largest continent. Many elephants, giraffes, zebras and lions live there.
