(共22张PPT)
人教版 八年级下
Unit 7 What’s the highest mountain in the world
Section A 1a-1c
Period 1
To learn and master the new words : square, meter, deep, desert, Qomolangma, in size, the Nile, the Caspian Sea, the Sahara.
To express large numbers.
To talk about some famous places in the world by using comparatives of superlatives.
Learning goals
Warm-up
Let’s read the numbers.
102
2,017
30,000
500,000,000
7,200,000,000
one hundred and two
two thousand and seventeen
thirty thousand
five hundred million
seven billion two hundred million
thousand(千)
billion(十亿)
million(百万)
Let’s read the number.
1,234,567,890
one billion two hundred and thirty-four million
five hundred and sixty-seven thousand
eight hundred and ninety
thousand
million
billion
Presentation
Can you read these large numbers now
9,600,000
1,025
6,671
8,848.86
nine million six hundred thousand
one thousand and twenty-five
six thousand six hundred and seventy-one
eight thousand eight hundred and forty-eight point eight six
Presentation
What do you know about these four numbers
Qomolangma is 8,848.86 meters high.
The Nile is 6,671 kilometers long.
The Caspian Sea is 1,025 meters deep.
The Sahara is about 9,600,000 square kilometers in size.
8,848.86 6,671 1,025 9,600,000
平方千米
（面积、体积等）大小
adj. 深的；纵深的
meter n. 米; 公尺
What’s the highest mountain in the world
It is 8,848.86 meters high. /It is 8,848.86 meters in height.
Geographical Facts
地理事实
How high is Qomolangma
What’s the biggest desert in the world
It is about 9,600,000 square kilometers in size.
n. 沙漠
How big is the Sahara
Which is the deepest salt lake in the world
It is 1,025 meters deep. / It is 1,025 meters in depth.
咸水湖
How deep is the Caspian Sea
Which is the longest river in the world
It is 6,671 kilometers long. / It is 6,671 kilometers in length.
How long is the Nile
Match the facts you know.
1a
Qomolangma about 9,600,000 square kilometers in size
The Sahara 1,025 meters deep
The Caspian Sea 6,671 kilometers long
The Nile 8,844.43 meters high
…8,848.86 meters high … 8,848.86米高
… meters high (long, wide…) ……米高（长，宽……)
e.g. The wall is 1.7 meters wide.
【注解】
Language points
Listening
Listen and complete the sentences.
1b
1. Qomolangma is ______ than any other mountain in the world.
2. The Sahara is ____________ desert in the world.
3. The Caspian Sea is ____________ of all the salt lakes.
4. The Nile is _________ river in the world.
higher
the biggest
the deepest
the longest
Listen and read.
Teacher: Yesterday, we learned some important geographical facts. I hope you all still remember them. I'm going to test you now by asking a few questions. First, what's the highest mountain in the world
Boy 1: Qomolangma! It's higher than any other mountain in the world.
Teacher: That's right. And who can tell me what the Sahara is
Girl 1: The Sahara is the biggest desert in the world.
Teacher: Very good. And which is the deepest salt lake in the world
Girl 2: The Caspian Sea is the deepest of all the salt lakes.
Teacher: You're all so smart! Now, for the last question, which is the
longest river in the world
Boy 2: I know! The Nile is the longest river in the world.
Boy 1: And the Amazon is the second longest river in the world.
Teacher: It seems that you know the answers to all my questions. Good job!
the+序数词+形容词最高级 第几……的
Use the information in 1b to make conversations.
1c
A: What is the highest
mountain in the world
B:Qomolangma.
Language points
1. 长、宽、高、深、面积的表达方法
基数词 + 单位词 + 形容词（long, wide, high, deep，big等）
基数词 + 单位词 + in + 名词（length, width, height, depth, size等）
The river is 20 meters wide.
= The river is 20 meters in width.
Summary
Language points
2. Qomolangma is higher than any other mountain in the world. (教材 P49 1b)
比较级 + than any other + 可数名词单数
该结构意为“比其他任何一个……都……”，指同一范围内比较，表示最高级含义。
She is thinner than any other student in her class.
= She is the thinnest in her class.
Language points
Exercises
单项选择
1. —____ is the Caspian Sea
— It’s about 1,025 meters deep.
A. How long B. How wide C. How deep
2.The terror event in Xinjiang is one of the ____ events in China.
A. bigger B. biggest C. big
3. Shanghai is bigger than ____ in China.
A. any other city B. any other cities C. other city
C
B
A
Summary
New words
Expressions
Sentences
square meter deep desert
in size
① Qomolangma is higher than any other mountains in the world.
② The Caspian Sea is the deepest of all the salt lakes.
③ How high/long/deep/wide/big is…
It's .... meters/kilometers high/long/deep/wide/in size.
Famous places
Qomolangma the Nile the Sahara the Caspian Sea
Homework
1. Read tapescripts of this period.
2. Recite words and expressions in this lesson.
3. Make some dialogues about asking the sizes of objects.
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