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(共23张PPT)
Section A 4a—4d
Unit 4
The Wonders of Nature
To learn to make.
To learn to write and read large numbers.
Objectives
Grammar Focus
4a
Read the sentences. Circle the adjective which compare
things. Underline the adverbs which compare actions.
What is the biggest desert in the world It is the Sahara Desert.
How big is it It is about 9,000,000 square kilometres in size.
Where is the deepest point in the ocean It is in the Mariana Trench.
How deep is it It is about 11,000 metres deep.
Some deep-sea animals are blind, but they can “see” as well as others. Mount Qomolangma is one of the greatest wonders of the world, and it is still growing taller. The Yangtze River travels the farthest in China and is about 6,300 kilometres long.
The superlative forms of adjectives and adverbs.
fast
short
high
light
tall
slow
直接加- est
heavy easy
happy hungry early
funny
把y 变 i 再加- est
规则变化
A
B
large
late
nice
加- st
biggest
thinnest
hottest
wettest
fattest
big
thin
hot
wet
fat
“双写”
最后一个辅音字母再加-est
C
D
useful
interesting
beautiful
good / well
bad / badly
many / much
little
far
在词前加
the most-
best
worst
most
least
farthest / furthest
不规则变化
E
F
形容词和副词的最高级
1. 表示三者或三者以上(人或事物)的比较，其中有一个在某一方面超
过其他几个，后面可用带有in、of、among的短语等来说明比较的范
围。形容词最高级的前面一般要加定冠词the，副词最高级前的the
可以省去。
①The blue whale is the largest and heaviest animal in the world.
②In my country, July is the hottest month of the year.
③The cheetah runs (the) fastest among all land animals.
某一范围内的比较用in
同一类事物范围内的比较用of
副词最高级前的the可以省去哦
This is my worst performance.
She is Lucy’s best friend.
Reminder:
如果最高级前有形容词性物主代词或名词所有格等修饰语时则不再用定冠词the。
2.最高级的常用结构
（1）the + 形容词或副词最高级 + in / of 短语
……中最……的
Tom is the tallest in his class.
Tom runs (the) fastest of all the students.
（2）序数词与最高级结合
The Yangtze River is the third longest river in the world.
（3）one of the + 形容词或副词最高级 +名词复数 表示“最……之一”
Beijing is one of the largest cities in the world.
（4）特殊疑问句中的最高级
Which animal jumps the highest, the lion, the monkey, or the tree frog
Who is the kindest person in your family
（5）比较级表达最高级的含义
Julia is taller than any other girl in her class.
=Julia is the tallest girl in her class.
is the ________mountain in the world.
Qomolangma
highest
Let’s practice!
is the _______
river in China.
longest
The Yangtze River
Read and guess.
are ______ ______ ________
of all the animals in China.
the
most
famous
Pandas
They are fat and cute, black and white. They only live in China and are more famous than any other animal to Chinese. People over the world love them and we’re doing our best to look after them.
Think and guess.
It begins at Chang’an.
This is an old trading road.
is the _______trading
route in the world.
The main product is silk.
oldest
The Silk Road
friendly
sing well
hard-working
popular
thin
talented
smart
funny
A: Who is the funniest in your class
B: …
A: Who is the thinnest in your class
B: I think …
I want to know you!
Let’s play a game!
Write or spell out the numbers.
4b
Mount Kilimanjaro is _______(five thousand, eight hundred and ninety-five) metres high.
_______(twenty-five thousand, seven hundred and sixty-eight) cubic metres of water pours down Inga Falls each second.
The East African Rift Valley is about 4,000 (____________) miles long.
The Taklimakan Desert has a total area of about 337,000 (___________________________________) square kilometres.
5,895
25,768
four thousand
three hundred and thirty-seven thousand
Complete the passage with the correct forms
of the words in the box.
4c
large amazing far close loud
My My friends and I visited Victoria Falls in Africa last year. Visiting one of the world's _______ waterfalls was a magical experience. As we went _______ to the falls, the noise of the water slowly grew ________ and louder. Then, right before our eyes, the waterfall
largest
closer
louder
Complete the passage with the correct forms
of the words in the box.
4c
large amazing far close loud
appeared. It went on for as _____ as the eye could see. Later, we sat in a special pool at the top of the falls. There, we felt the water rush past us and become a part of the waterfall. It was the scariest but also the ____________ experience of our trip!
far
most amazing
Write some questions to compare places. Then
ask a partner your questions.
4d
What is the highest …
Which park is bigger, … or …
Ask and answer.
What is the highest plateau in China
It’s the Qinghai–Xizang Plateau.
Language points
Later, we sat in a special pool at the top of the falls.
pool n. 池塘；水坑
(2) at the top of 在……顶端
短语
swimming pool 游泳池
反义短语
in/at the bottom of 在……底部
She supervised the children playing near the pool.
她照料着在水池附近玩的几个孩子。
Please write your telephone number at the top of this page.
请把你的电话号码写在这张纸的顶端。
This is the ________ (bad) movie I have ever seen. I don’t want to watch it again.
2. I think it is the __________ (quick) way to get there of all
the ways. Do you agree with me
3. Our teacher, Mr. Wang, is the ______________ person
that I have ever met. (humorous)
quickest
most humorous
worst
I. 用所给单词的适当形式填空。
Exercises
3. Lin Sen is _______________________ in the class because he never gets to school on time. （最懒的学生之一）
4. Edison was_________________________in the world. 　(最伟大的发明家之一）
one of the laziest students
one of the greatest inventors
The Yangtze River is________________river in the world. (第三长河）
the third longest
2. The Atlantic is __________________ ocean in the world.
( 第二大洋）
the second biggest
II. 完成句子。
Homework
1.Do some exercises by using comparatives
and superlatives.
2.Write a composition to introduce your
classmates by using comparatives and
superlatives.

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