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(共14张PPT)
Section A (4a-4d)
Grammar
The Wonders of Nature
Unit4
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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.
Lead in
5464km
6300km
2320km
Let’s compare the following natural wonders in China.
the Zhujiang River
the Yellow River
the Yangtze River
The Zhujiang River is a long river.
The Yellow River is longer than the Zhujiang River.
The Yangtze River is the longest of all.
long
longer
longest
两者比较用比较级
三者或以上比较用最高级
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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.
Find the comparatives (比较级)and superlatives（最高级）.
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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.
世界上最大的沙漠是什么？
是撒哈拉沙漠。
有多大？
它的面积约为900万平方公里
海洋最深的地方在哪里？
是马里亚纳海沟。
它有多深？
它大约有11000米深。
有些深海动物是看不见的，但它们和其他动物一样能“看见”
珠穆朗玛峰是世界上最伟大的奇迹之一，而且它还在长高。
长江是中国最长的河流，长约6300公里。
形容词和副词的比较等级
Let’s learn
英语中的形容词和副词常用三种形式来表达事物的等级差别，
即原级、比较级和最高级。
原级：没有比较含义；
比较级：两者间比较，表示“较……”或“更……”；
最高级：三者及三者以上比较，表示“最……”，形容词最
高级前一般要加定冠词 the，副词最高级前的 the 可以省略。
1．形容词和副词的比较级、最高级的构成(规则变化)
单音节词和部分双音节词 多音节词和部分双音节词
一般在词尾加-er或-est 以e结尾的词加-r或-st 以“辅音字母+ y”结尾的双音节词，把y变为i再加-er或-est 以一个辅音字母结尾的重读闭音节词，双写这个辅音字母后再加-er或-est 在单词前加 more 构成比较级，加 most 构成最高级
fast→faster→fastest nice→nicer→nicest easy→easier→ easiest big→bigger→ biggest beautiful→more beautiful→most beautiful
Let’s learn
形容词和副词的比较等级
1．形容词和副词的比较级、最高级的构成（不规则变形）
原级 比较级 最高级
good/well
many/much
bad/badly/ill
little
old
far
better
best
more
most
worse
worst
less
least
older/elder
oldest/eldest
farther/further
farthest/furthest
Let’s learn
形容词和副词的比较等级
1.big __________ _________ 2. high __________ ________
3. low __________ __________ 4. deep __________ __________
5. easy __________ __________ 6. far __________ __________
7. happy __________ _______ 8. early __________ __________
9. great __________ __________ 10. close __________ __________
11. amazing_______________ ________________
12. interesting______________ ________________
13. well __________ __________ 14. little __________ __________
写出下列单词的比较级和最高级
bigger
biggest
higher
highest
lower
lowest
deeper
deepest
easier
easiest
farther
farthest
happier
happiest
earlier
earliest
greater
greatest
closer
closest
more amazing
most amazing
more interesting
most interesting
better
best
less
least
Let’s practice
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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!
4c
adj.
adj.
adj./adv.
adj./adv.
adj./adv.
largest
closer
louder
far
most amazing
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8,848.86
thousand
point
eight six
and
Let’s learn
How to read the large numbers
1.数字从后往前数，每三位标一个逗号。
2.从后往前，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。
4. 英语中,“几百、几千、几百万、几十亿”都不加“s”; 并且没有直接表示“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”。
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.
Write or spell out the numbers.
5,895
乞力马扎罗山
25,768
因加瀑布
东非大裂谷
塔克拉玛干沙漠
three hundred and thirty-seven thousand
four thousand
4b
Write some questions to compare places. Then ask a partner your questions.
What is the highest/deepest/largest...
Which park is bigger, ... or ...
4d
I’m Doubao. If you want to know more, you can ask me for information!
用所给词的适当形式填空
1.The Yellow River is _________ (long) than the Huaihe River.
2.Mount Tai is the _________ (high) of the two mountains in Shandong.
3.The sea is getting more and more _________ (beautiful) with environmental protection.
4.This lake is the _________ (deep) in our province.
5.Which is _________ (long), the Amazon River or the Nile River
6.This river is three metres __________ (wide) than that one.
7.Hainan Island is the second __________(large) island in China.
8.The sunset over the ocean is one of the _______________ (amazing) sceneries in the world.
longer
higher
beautiful
deepest
longer
wider
largest
most amazing
Exercise

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