(共33张PPT)
Unit 7 Know Our World
Lesson 38 The World Is a Big Place
1. To master the new words and phrases
planet, billion, total, increase, surface, Indian, Atlantic, Arctic, by…, one third, be covered with…, must be treated…
2. To learn about the earth.
Learning objectives
Warm up
What do you know about the earth
New words and expressions.
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
New words and expressions.
Atlantic
Arctic
n. & adj. 大西洋（的）
adj. 北极的
Fill in the blanks.
1. The ________(总计的) cost will be 126 dollars.
2. The ________(表层) of our body is skin.
3. The population has ________(增加) from 1.2 million to 1.8 million.
4. To an ________(印度人), the owl(猫头鹰) is a symbol of bad luck!
5. Seven other ________(行星)also go around the sun.
total
surface
increased
Indian
planets
Think about it.
· How many continents are there in the world What are they
· What do you know about the place where you live
a. Six of the seven continents are good for people to live on.
b. We should treat the earth well.
c. An increasing population is a big problem for the earth.
d. Two thirds of the earth is covered with oceans.
e. People cannot live everywhere on the earth.
Paragraph 1
Paragraph 2
Paragraph 3
Paragraph 4
Paragraph 5
Read the lesson and match each paragraph with its main idea.
1
In the year 2010, the world’s population was over 7 billion in total. It is increasing every quickly.
Language Points
十亿
总计
增长
【探究】
billion 意为“十亿”，前面有具体数字时，用单数形式；后面加of表示概数时，用复数形式。例如:
two billion 20亿 billions of… 数十亿……
eg: The Galaxy consists of 100 billion stars.
The country owes billions of dollars to foreign creditors
-Food safety has become one of the hottest topics recently.
-Yeah, it receives _____ Internet hits a day.( )
A. thousands B. thousands of
C. thousand D. hundreds
B
【拓展】
in total 意为“总计；合计”
a total of 意为“总数为……”，修饰可数名词复数时，其谓语动词用复数形式。
the total of...意为“全部的……”，后的谓语动词一般用单数形式。
eg: There are seven books in total.
A total of 58 people were injured.
Twenty dollars a week is the total of their income.
There are 200 teachers in our school _____.( )
A. at last B. less than
C. more than D. in total
D
【探究】
increase意为“增加；增大”，可用作及物动词，也可用作不及物动词。其用作及物动词时，常接名词作宾语。
eg: Reading can increase your knowledge.
Obesity can increase the risk of heart disease.
人口正在非常迅速地增长。
The population is __________ very quickly.
increasing
By 2025, the world may have about 8 billion people.
到……为止
【探究】
“by+时间”意为“到……为止；不迟于……”。
by后加过去时间，主句用过去完成时。
by后加现在时间，主句用现在完成时。
by后加将来时间，且从句事件发生在主句事件之前，主句动词可用一般时态。
eg: By the time he was fourteen years old, he had learned maths all by himself.
I have done my homework by the time you come.
Can you reply to me by tomorrow
我会在五点前完成作业
I will finish my homework ____________.
by five o’clock
We can’t live in water, and only about one third of our planet is land.
三分之一
【探究】
one third表示分数1/3。
英语中分数的表达方法：分子用基数词，分母用序数词。如果分子大于1，则分母用复数形式。分子和分母中间可加连字符，也可不加。表示“一半”时，常用half。
eg: 2/7→two sevenths/two-sevenths
1/2→one half
【拓展】
分数修饰名词作主语时，谓语动词的单复数要根据分数所修饰的名词的单复数来定。
eg: Three fourths of the money has been spent on books.
Two thirds of the students in our class are boys.
_____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
D
Antarctica is covered with snow and ice all year round.
被……覆盖
【探究】
be covered with… 意为“被……覆盖”，其主动结构为cover...with...（用……盖住……）
eg: In a few year’s time, those mountains will be covered with trees.
The house was covered with snow.
我们的花园被花草覆盖着。
Our garden is ___________ grass and flowers.
covered with
It must be treated well for our children and for our children’s children, too!
一定要被好好对待
【探究】
must be treated为含有情态动词的被动语态形式。含有情态动词的被动语态构成形式为“情态动词+be+动词的过去分词”。
eg: An art school may be opened next year.
This book must not be removed from the library.
Children should _____ to be honest at a young age.( )
A. educate B. be educated
C. punish D. be punished
B
Match the seven continents with their correct descriptions.
3
It is the biggest continent. It has the highest point on the earth in the Himalayas.
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.
Europe
South America
Asia
Africa
Australia
Antarctica
North America
Fill in the blanks with correct forms of the words in the box.
2
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
Fill in the blanks with the correct forms of the words.
1. Listening to music is a good way _________(relax).
2. Places without trees or grass are _________(call) deserts.
3. English _________(speak) in Canada.
4. One fourth of the rain _________(come) from the Pacific Ocean.
5. Over three _________(five) of the doctors were women.
to relax
called
is spoken
comes
fifths
Fill in the blanks with appropriate prepositions.
1. ______ the end of this week, I have written 100 articles.
2. ______ next year, the number of the trees in our school will reach 500.
3. ______ total, there are two hundred visitors.
4. In winter the lake is covered ______ ice.
5. Only about one third ______ our planet is land.
By
By
In
with
of
Summary
planet, billion, total, increase, surface, Indian, Atlantic, Arctic, by…, one third, be covered with…, must be treated…
GOOD JOB
