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(共20张PPT)
Unit 4 The Wonders of Nature
Section A What is amazing about nature
Grammar Focus(4a-4d)
Learning Objectives
In this lesson you will:
1. review the usage of the comparatives and superlatives.
2. master the rules about how to read large numbers in English.
3. talk about more natural wonders and places using the target
language.
Look and Say
Work in pairs to compare the following natural wonders.
Yellow River
Yangtze River
5464km
6300km
e.g.The Yangtze River is longer than the Yellow River. It’s the longest
river in China.
Mount Huangshan
Mount Qomolangma
1,864.8 m
8,848.86 m
e.g. Mount Qomolangma is the tallest mountain in the world, while
Mount Huangshan is famous for its unique scenery.
Sahara Desert
Taklimakan Desert
9,000,000 square kilometers, in Africa
337,600 square kilometers, in China
e.g. The Sahara Desert is much larger than the Taklimakan Desert and
it’s the largest desert in the world. The Taklimakan Desert is the
largest in China.
Lake Baikal
Qinghai Lake
/ba k l/
salt water lake, the largest lake in China
the deepest lake in the world, with a maximum depth of 1,642 meters
e.g. Lake Baikal is the deepest lake in the world, while Qinghai
Lake is the largest lake in China.
Read the sentences. Circle the adjectives which compare things. Underline the adverbs which compare actions.
4a
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.
Grammar Rules
形容词和副词的比较级和最高级的构成
构成方法 原级 比较级 最高级
单音节词和部分双音节词 一般情况下，比较级词尾加-er，最高级词尾加-est。 tall short high taller shorter higher tallest
shortest
highest
以字母e结尾的词，比较级词尾加-r，最高级词尾加-st。 large late larger later
largest
latest
重读闭音节词尾只有一个辅音字母时，先双写该辅音字母，然后比较级词尾加-er，最高级词尾加-est。 big fat thin bigger fatter thinner
biggest
fattest
thinnest
构成方法 原级 比较级 最高级
单音节词和部分双音节词 以“辅音字母+y”结尾的双音节词，先把y改为i，然后比较级词尾加-er，最高级词尾加-est。 easy heavy easier heavier
easiest
heaviest
多音节词和部分双音节词 词前加more构成比较级，词前加most构成最高级。 beautiful quickly more beautiful more quickly
most beautiful
most quickly
形容词和副词的比较级和最高级的用法
等级 用法 例句
比较级 表示两者(人或事物)的比较。在“比较级+than”的句型中，当than前后所使用的动词相同时，通常用助动词代替后面的动词。该助动词也可以省略。
I'm more outgoing than my sister.
She sings better than he (does).
最高级 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of、in、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可以省略。
What’s the biggest desert in China
Is that the longest river in China
Jack studies (the) hardest in his class.
“as+形容词或副词原形+as”句型
(1)表示 “两者在某一方面相同时”，用“as+形容词或副词原形+as”的句型。例如:
I think science is as important as maths.
Tom runs as fast as Jack.
(2)表示 “一方在某一方面不及另一方时”，用“not as / so+形容词或副词原形+as”的句型。例如:
It is not as / so warm today as yesterday.
He did not come as / so early as Wang Lin.
大数字的英文读法
英语里数字的基本单位有：hundred（百） ，thousand（千） ，million（百万） ，billion（十亿） ，trillion（万亿，兆） 。例如：
300 读作 three hundred 5000 读作 five thousand
具体数字读法： 以数字345,678,912为例:
1）从右向左划分:按照三位一节，用逗号隔开，这个数字可划分为345,678,912。从右往左，第一个逗号前是千(thousand)，第二个逗号前是百万(million)，第三个逗号前是十亿(billion)
2）依次读出每一节: 最右边一节912，读作“nine hundred and twelve”(注意，在英式英语中，百位和十位之间常用“and”连接，美式英语中，“and”可省略)。 中间一节678，读作“six hundred and seventy-eight”，加上它的单位“thousand”，这部分就读作“six hundred and seventy-eight thousand”。最左边一节345，读作“three hundred and forty-five”，加上单位“million”，这部分读作“three hundred and forty-five million"。
3）组合起来:整个数字就读作“three hundred and forty-five million, six hundred and seventy-eight thousand, nine hundred and twelve"。
注意：小数点读作“point”，小数点左边的数按整数读法读，右边的数依次读出每个数字。例如:
3.14读作“three point one four”
8848.86 读作“eight thousand，eight hundred and forty-eight point eight six" .
Write or spell out the numbers.
1. Mount Kilimanjaro is ____________(five thousand, eight hundred and ninety-five) metres high.
2.____________(twenty-five thousand, seven hundred and sixty-eight) cubic metres of water pours down Inga Falls each second.
3. The East African Rift Valley is about 4,000 (______________) miles long.
4. The Taklimakan Desert has a total area of about 337,000 (_____________________________________) square kilometres.
5895
25,768
four thousand
three hundred and thirty-seven thousand
4b
Complete the passage with the correct forms of the words in the box.
large amazing far close loud
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 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!
largest
close
louder
far
most amazing
4c
Write some questions to compare places. Then ask a partner your questions.
What is the highest ...
Which park is bigger, ... or ...
4d
1. 25,768 cubic metres of water pours down Inga Falls each second.
Language Points
cubic是形容词，意为“立方的” ，可以表示体积单位，还可以用来描述物体呈立方体形态。名词形式为 “cube”（立方体、立方）。
常见搭配：
cubic meter 立方米（缩写：m ）
cubic centimeter 立方厘米（缩写：cm ）
a cubic structure 立方体结构
pour down 大量倾泻、涌下
多用来形容雨、雪、阳光等自然现象 “猛烈、持续地降下”，主语通常是自然事物（如 rain, snow, sunlight）
e.g. The rain poured down all night, so the roads were flooded this morning.（雨下了一整夜，所以今早路面被淹了。）
Warm sunlight poured down through the window, lighting up the room.（温暖的阳光透过窗户洒进来，照亮了整个房间。）

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