资源简介

(共33张PPT)
Unit 4
The Wonders of Nature
人教版八年级下册
Section A (4a-4d)
Learning
goals
01
Learn new words and phrases:
cubic metre, mile, pool
Share geography facts using large numbers.
01
02
Warming
up
02
Can you say a number bigger than 10
one hundred
100
two hundred and seventy-eight
278
four hundred and fifty-one
451
7274
Grammar
03
4a
Read the sentences. Circle the adjectives 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.
比较级(用于两者之间的比较)
①形容词比较级＋than...
He is taller than me. 他比我高。
②the+比较级, the +比较级 越……，就越……
The more careful you are, the fewer mistakes you will make.你越仔细，犯的错误就越少。
Grammar
形容词和副词的比较级和最高级
比较级(用于两者之间的比较)
③比较级+and+比较级
more and more+原级
The weather is getting colder and colder.天气越来越冷了。
Our hometown is becoming more and more beautiful.我们的家乡变得越来越美丽。
Grammar
形容词和副词的比较级和最高级
越来越……
最高级(用于三者或三者以上的比较)：
①the+形容词的最高级＋of/in...
He is the tallest of the three.
他是这三个人中最高的。
He is the funniest in his class.
他是他们班最有趣的。
最高级(用于三者或三者以上的比较)：
②one of the+形容词最高级+可数名词复数
＋of/in... ……中最……的……之一
Pingyao Ancient City is one of the
best-kept ancient cities in China.
平遥古城是中国保存最完好的
古城之一。
最高级(用于三者或三者以上的比较)：
③Which/Who ...+(the) +最高级, A, B or C
Who sings the best in your class, Lily,
Tom or Jack 你们班谁唱的最好，
莉莉、汤姆还是杰克？
形容词、副词比较级和最高级的变化：
规则变化
①一般情况下，单音节或双音节的形容词
（或副词）比较级＋er ，最高级＋est
clever－cleverer－cleverest
few－fewer－fewest
small－smaller－smallest
②以e结尾的词，比较级＋r，最高级＋st
nice－nicer－nicest cute－cuter－cutest
large－larger－largest
③以“辅音字母＋y”结尾的变y为i＋er或est
easy－easier－easiest
happy－happier－happiest
④多音节和部分双音节词需要在形容词原级前＋more构成比较级，＋the most构成最高级。
beautiful－more beautiful－the most beautiful
careful－more careful－the most careful
useful－more useful－the most useful
不规则变化
good －better－best well－better－best
bad－worse－worst
many, much－more－most
far－farther－farthest (距离远)
far－further－furthest (程度深)
old－elder－eldest (长幼)
old－older－oldest (年龄)
较大数字的表达与读法
1. 从数字的右端向左数，每三位数加一个逗号。
2. 从右向左，第一个逗号处读thousand(千)，第二个逗
号处读million(百万)，第三个逗号处读billion(十亿)。
3. 读的时候通常在hundred后加and，如果百位数为0，
则在thousand后加and。
大于一千的基数词的表达法
4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand 和million来表达，如“一万”用“ten thousand”、“一亿”用“one hundred million”。
2,674→two thousand six hundred and seventy-four
164,213,430→ one hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty
18,357,089→ eighteen million, three hundred and fifty-seven thousand, and eighty-nine
5,204,000,000→five billion two hundred and four million
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.
5, 895
three hundred and thirty-seven thousand
4b
Write or spell out the numbers.
25, 768
four thousand
总面积为……
4c
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 louder and_________. 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
most amazing
closer
louder
far
极目所尽
Practice
04
4d
Write some questions to compare places. Then ask a partner your questions.
What is the highest...
Which park is bigger, ... or ...
1) Mount Qomolangma is_________than any other mountain in the world.
2) The Sahara Desert is_____________ desert in the world.
4) The Nile is____________ river in the world.
6) — Did you know that China is one of___________
countries in the world
— Yes, I did. It’s_______ _______ than my country.
higher
the biggest
Fill in the blanks.
the longest
the oldest
much older
Language
points
05
as far as... 远至 (某处)
There was a fire in the mountain, which came up as far as our village. 山里发生了火灾，都蔓延到我们村了。
It went on for as far as the eye could see. 它一眼望不到头。(教材 P35 4c)
As far as we/I know 据我/我们所知
As far as we know, the Sahara is the biggest desert in the world. 据我们所知，撒哈拉沙漠是世界上最大的沙漠。
拓展
Summary
06
比较级和最高级的构成
语法知识导图
比较级+than
the+比较级，the+比较级
比较级的用法
规则变化、不规则变化
形容词和副词的比较级与最高级
比较级+and+比较级
more and more+形容词/副词原级
语法知识导图
最高级的用法
形容词和副词的比较级与最高级
(the+)最高级+in/of/among短语
one of the+形容词最高级+可数名词复数+in/of 短语
“Which/Who…(+the)+最高级，A, B or C ”
Homework
07
Review the grammar after class.
汇报人：WPS
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