(共25张PPT)
Solar system
Mars is the fourth planet from the sun in our solar system and is named after Mars, the Roman god of war.
Lead-in
Unit 4 Topic 3
Section C
学习目标
1.重点掌握单词：storm ，weigh, journey; 理解单词： solar system, Roman, diameter, gravity，limit，god.
2.Learn more knowledge about Mars.（了解更多关于火星的知识）
3.培养学生热爱科学、探索未知领域的积极态度。
A circle is divided into two halves by _______.
circle
diameter
单词抢答
adj. 古罗马的，罗马帝国的
n. 古罗马人，罗马人
1. Do in Rome as the
___________ do .
2. All roads lead to Rome.
Romans
暴风(雨)
storm
Solar system
学习指导（一）﹙学习1a
（一）. 学习指导：（5mins）
1. 先用1分钟口头翻译问题 :
1）.What does mars look like
2）.What’s the gravity on Mars
2. 合上课本，听1a录音，然后回答上面问题；再听1a录音，大声模仿录音跟读，纠正发音；
3.朗读1a,独自完成1b；
4.认真读P94-2康康叔叔从火星上发送给康康的e-mail, 选择正确的单词填空；
5.参照课后注解，精读1a和2，并画出短文中的重点短语和句型。
（二）. 自研共探：（7mins)
参照119页Section C的课文注释，自读1a和2，并口头翻译,要弄懂每个句子，划出重点短语和句型，若有不理解的语言点，可与同桌小声交流，难理解的问题，进行小组讨论，解决自学中的疑惑点，完成学习指导的几项任务。
（三）. 学情展示（8mins）
教师指名或抽签四个小组，在黑板上板书或口头展示小组内讨论结果，根据情况适当加分或加星。其他小组可质疑补充，回答正确的可适当加分或加星。教师可根据学生展示过程中出现的问题进行适当的点拨。
1. Its diameter is 53% as wide as that of the
earth.它的直径是地球直径的53%。
2. The gravity on the surface of Mars is about
two-fifths as strong as it is on earth.火星表面
的引力大约是地球引力的五分之二。
倍数(分数)+ as +adj.+as ……的几倍
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 … 相隔……
Language Points
two–fifths as strong as 相当于……的五分之二强度
two–fifths = two fifths
half as big as 像……一半那样大
twice as long as 像……两倍那样长
as﹢形容词/副词原级﹢as ﹢名词
像…... 一样 …...
倍数词/分数/百分数﹢as ﹢形容词或副词原级﹢as
是…的几倍/几分之几/百分之几
小提示：
1b Read 1a again and write down the information about Mars.
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
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.
Exercise
fourth
distance
red
orange
spring
summer
storms
surface
two-fifths
strong
diameter
Read 2 and answer the questions.
(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.
1c Discuss the crazy questions with your partner and state your reasons.
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
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. ______________(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
since
took
get
quite
What’s worse
those
What
2 Kangkang’s uncle sent an e-mail to him from Mars. Choose the right words to complete the letter.
点拨
It has been two days since we landed on Mars.
同义句：It ____two days ______ we
landed on Mars.
翻译:__________________________
总结：it 用作主语谈论时间，与since连用的常见结构：
（1）It has been +一段时间+since+从句
（2）It is +一段时间+since+从句
is
since
写作训练（7mins）
写作指导:
1.Pair work：两人结对，讨论1c中有关火 星Mars 的问题，各抒己见；
2.写作训练：替康康给Uncle Stephen回一封个e-mail,了解更多关于Mars的信息，
如：衣服、饮食、天气、交通等。
3.各组可推荐优秀代表，上台展示写作成果，给感觉写作困难的同学一个示范。
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 am looking forward to your e-mail!
Good luck!
Yours,
Kangkang
You can write it like this :
Summary
We learn: 1. Some words: storm, weigh, journey
2. Some phrases: name after, as …as,
at a distance of, search for
3. Some sentences:
(1) Its diameter is 53% as wide as that
of the earth.
(2) It has been two days since we
landed on Mars.
We can : 1. Talk about something more
about Mars.
2. Write back an e-mail.
二. 单项选择
( ) 1. This ____ in such a short time . We still have
too many things to do .
A must be do B can done C can’t be done D is done
( ) 2. Your apple is about ______ mine .
A second threes as big B two threes as big as
C two thirds as big as D second thirds as big as
( ) 3. The digital camera is ____ nine hundred yuan .
A pay B cost C worth D spend
( ) 4. The fiction film is so interesting for us that it’s worth _____ .
A see B to see C seeing D sees
C
C
C
巩固提升
C
( ) 5. It ____ 6 days since I came to Beijing . I’m leaving tomorrow .
A was B is C has been D B and C
( ) 6. She really likes dancing . It ____ her 2 hours to practice dancing
in the gym every day .
A takes B spends C costs D uses
( ) 7. It’s three years _____ we got here .
A since B before C after D at least
D
A
A
二、用所给词的正确形式完成对话。
Tony: I’ve just _______ ( see ) a great TV program
about space . Did you know that scientists have
__________ ( discover ) water on Mars
Jim : No ! Really That’s very interesting : Are they ____ ( try ) to find life on Mars
Tony : Well , they’re looking for life but they
______( not find ) anything yet .
Jim : They’ve already _______( decide ) that there’s no life on the moon .
Tony : Yes , that’s right . So far there’s life only
on the earth .
