Unit 4 Amazing Science Topic 2 Section C 课件(共31张PPT) 2024-2025学年英语仁爱版九年级上册

(共31张PPT)
Unit 4
Amazing Science
Topic 2 Section C
学习目标
重点探究
自主学习
学习导航
当堂检测
课堂总结
拓展提升
新课导入
What do you know about Mars
学习目标
能熟悉并正确运用本课时的重点单词和短语
能掌握含有分数，百分数等的同级比较
能了解火星的相关知识
自主学习
New words and expressions
solar system 太阳系
Roman adj. 古罗马的，古罗马帝国的
god n. 上帝；神
diameter n. 直径
storm n. 风暴，暴（风）雨
gravity n. 重力；引力
weigh v. 重，有……重
generally adv. 一般地，通常
journey n. （尤指长途）旅行
limit v. 限制，限定 n. 限度；限制
excitement n. 激动；令人激动的事
Mars is the fourth planet from the sun in our solar system and is named after Mars, the Roman god of war.
the Roman god of war
solar system
Mars
be named after 以……而命名
太阳系
罗马战神
The solar system
Mars goes around the sun at a distance of about 228 million kilometers.
↑
228,000,000 km
……相隔……
It is much smaller than the earth. Its diameter is 53% of the earth’s.
diameter
直径[ da ′ m t (r) ]
During spring and summer, the strong storms can cover the whole surface of Mars.
n. 风暴，暴(风)雨
The gravity on its surface is about 40% as strong as it is on earth.
200 kilos
How much does he weigh on Mars
He weighs 80 kilos on Mars.
[′gr v ti ]引力，重力
重点探究
1. Mars looks like a red ball. ( )
2. The temperature on Mars is very high. ( )
3. Mars is much larger than the earth. ( )
4. Mars is too far away for us to reach. ( )
T
F
F
F
Look at the pictures and predict which statements
are true about Mars. Then read and check.
What do you know about Mars What does it look like
Mars is the fourth planet from the sun in our solar system and is named after Mars, the Roman god of war. Its diameter is 53% as wide as that of the earth. Mars goes around the sun at a distance of about 228 million kilometers. You can tell which planet is Mars because it is bright red in the night sky. It looks like a red and orange ball. It's very beautiful. But during spring and summer, the surface of Mars is covered by strong storms.
1a Read and understand.
The gravity on the surface of Mars is about two-fifths as strong as it is on earth. So a person who weighs 90 kilos on earth weighs only 36 kilos on Mars. The temperature on Mars is between -138℃ and 28℃. The air has only 0.13% oxygen.
It takes a spaceship about eight months to reach Mars from the earth when the two planets are closest to each other. Scientists are still searching for more information about Mars.
A. Describe what Mars looks like.
B. Ask what Mars looks like.
C. Search for more information about Mars in the future.
Para. 1 ___________
Para. 2 ___________
Para. 3 ___________
B
A
C
Read and find out the main idea of each paragraph.
搜索
Diameter Color Shape
Climate Gravity Distance from the sun
53% as wide as that of the earth
red and orange
a ball
during spring and summer: strong storms temperature: between
-138℃and 28℃
about two-fifths as strong as it is on earth
about 228 million kilometers
1b Read 1a again and write down the information
about Mars.
Mars, the ______ planet of the solar system, goes around the sun at a ________ of about 228 million kilometers. Its ________ is 53% as wide as that of the earth. It looks like a _____ and _______ball. It’s very beautiful. But during ______ and _______, strong ______ can cover the whole ________ of Mars. The gravity on the surface of it is about ________ as ________ as it is on earth.
fourth
distance
diameter
red
orange
spring
storms
surface
two-fifths
strong
summer
Fill in the blanks based on 1a.
1. Does Mars have a good climate for plants
2. Is Mars a useful place to dry fruit
3. Is Mars a good place for human beings to live
4. Is Mars a comfortable place for heavy people
1c Discuss the crazy questions with your partner and
state your reasons.
What have we learnt about Mars and let’s draw a mind map.
Mars
What does it look like
Is it a good place to live
Its diameter
Distance from the sun
color
shape
A good climate
Proper temperature
Enough oxygen
Strong gravity
Discussion
Hi Kangkang,
It has been two days_______( since, from) we landed on Mars. It ______(cost, took) us more than two years to______ (reach, get) here. Generally, the journey went well, but the living conditions were _____( quiet, quite) bad during the journey. We had to produce most of the food in the spaceship.
since
took
get
quite
2 Kangkang’s uncle sent an e-mail to him from Mars.
Choose the right words to complete the letter.
____________(What’s more, What’s worse), our water supplies were very low. We had to limit the use of water during ______(those, these) days. So we had a shower every six weeks. We will spend another seven hundred and sixty-three days on Mars. ______( How, What )a long time! I often miss the family, but the excitement of being on Mars is worth it!
Wish me luck!
Yours,
Uncle Stephen
What’s worse
those
What
(1) Who is this e-mail from and to
It is from Uncle Stephen to Kangkang.
(2) How long did it take them to get there
More than two years.
(3) Did everything go well during the journey
No, it didn’t.
Read 2 and answer the questions.
Dear Uncle,
I am excited to hear that you have landed on Mars. I wonder whether it is true.
____________________________________________________
clothing ; food and drinks ;
weather ; transportation …
3a Write back an e-mail to Uncle Stephen for
Kangkang and ask him for more information
about Mars. The list may help you.
Dear Uncle,
I'm very glad to receive your e-mail, and I know that the living conditions were quite bad during your journey. I am interested in the information about Mars. Can you tell me more about it How about the weather on Mars Is it very cold What kind of transportation do you use there I'm looking forward to your e-mail!
Good luck!
Yours,
Kangkang
3b Work in pairs. Check your partner’s e-mail and use
your knowledge of Mars to answer the questions for
Uncle Stephen.
Language points
拓展提升
1. Mars is the fourth planet from the sun in our solar system
and is named after Mars.
火星是太阳系中离太阳第四远的行星，以火星命名。
name ... after 以……的名字给……取名
be named after 是被动语态
e.g. The baby was named after Bruce Lee.
这个婴儿的名字是以李小龙的名字取的。
2. Its diameter is 53% as wide as that of the earth.
它的直径是地球直径的53%。
倍数的表示法：倍数+as +形容词或副词原级+as
e.g. This box is five times as heavy as that one.
这个盒子是那个盒子的四倍重。
My house is three times as big as his.
我家是他家的三倍大。
3. Mars goes around the sun at a distance of about 228 million kilometers.
火星在距太阳约228 000 000千米处环绕着太阳转。
at a distance of … 有……距离 at a distance of 相隔
at a distance 在远处，有相当的距离
e.g. The moon goes around the earth at a distance of 380 000 km.
月球在距地球38万千米的地方绕地球旋转。
The police followed him at a distance.
警察远远地跟着他。
in the distance 在远处
e.g. That is Long Island in the distance over there.
那边远处是长岛。
4. You can tell which planet is Mars because it is bright red in the night sky.
你可以分辨出哪颗行星是火星，因为它在夜空中是明亮的红色。
tell在这里为“辨别，区别，认出”，常和can, could, be able to连用。
e.g. It was so dark that I couldn’t tell it was you.
天太暗了，我没有认出是你。
5. The surface of Mars is covered by strong storms.
火星表面被强烈的风暴覆盖着。
be covered 被覆盖
be covered with 遮盖，遮蔽
e.g. The ground is covered with show. 土地被雪覆盖。
6. Scientists are still searching for more information about Mars.
科学家们正在对火星进行更多的探索。
search for 寻找，搜索
e.g. All night they searched for the lost boy.
整个晚上他们都在搜寻那个丢失的男孩。
search… for… 寻找，搜索（强调有具体的目标）
e.g. She searched many shops for Jim’s gift.
为了送给Jim礼物，她搜索了很多店。
search 在……搜查；搜身。是个及物动词，后面直接跟
“被搜查的对象”。
e.g. Mr. Smith searched every room in the house.
史密斯先生搜索了房子里的每个房间。
当堂检测
一、用方框中所给词的适当形式填空。
storm, journey, weigh, general, excite
1. The news of launching Chang’e Ⅲ caused people’s great
.
2. , the weather in Sichuan is neither too cold nor too
hot in summer.
3. The end of everybody’s is the same, death.
4. The sky cleared up after the , and the sun was shining
in the sky.
5. He himself on the scale, and it was 60 kg.
excitement
Generally
journey
storm
weighed
课堂总结
能掌握含有分数，百分数等的同级比较
了解火星的相关知识
Unit 4 Topic 2
Section C