(共23张PPT)
If you shed tears when you miss the sun, you also miss the stars.
如果你因为错过太阳而哭泣，你将会错过繁星。--泰戈尔《飞鸟集》
Unit 4 Amazing Science
Topic 1 When was it invented
Section D
What’s it used for
It’s used for listening to music.
What’s it made of
It’s made of plastic.
Where was it invented
It was invented in Korea.
When was it invented
It was invented in 1998.
What’s it used for
It’s used for communicating easily.
What’s it made of
It’s made of plastic and metal.
Where was it invented
It was invented in America.
When was it invented
It was invented in 1973.
Have you ever got lost somewhere What method did you use to find your direction
（影片）
学习目标
1.学习并掌握单词和短语:mark, explorer ; 理解单词: global.
2.掌握并熟练运用一般过去时的被动语态。
3.了解GPS定位系统，谈论其给我们的生活带来的影响，从而使学生崇尚科学，学习科学。
自学指导﹙学习1a﹚
（一）. 学习指导：
1.听录音, 回答下列问题并核对答案。
(1) What is GPS
2.再读短文,分组讨论后面的四个问题。
3. 在短文中找出下列短语，用彩笔重点标出，并熟记。
1）.按/朝……方向 2）.奏效；起作用
3）.只要；长达 4）.在其余时间期间
5）. 在任何时间 6）.找出，查明
7）. 被用来做...... 8）......的形状
自研共探：（7mins)
参照116页Section D的课文注释，了解全球定位系统，自读短文, 并理解，划出重点短语和句型，若有不理解的语言点，可向本小组同学求助，然后小组讨论，解决自学中的疑惑点， 完成学习指导的任务。
What method did you use to find your lost cellphone
GPS is like a man-made star. We can use it at any time, in any place and in any weather to find out our position. The early explorers used the stars as landmarks to know where they were and in which direction they were going. This method worked well at night as long as the weather was good. But it didn’t
work so well during the rest of the time.
Let’s use the GPS.
n.探险者，
勘探者
What is GPS
GPS即全球定位系统(Global Positioning System)，简单地说，这是一个由覆盖全球的24颗卫星组成的卫星系统。这个系统可以保证在任意时刻，地球上任意一点都可以同时观测到4颗卫星，该观测点可以通过接收到的信号
计算出经纬度和高度，以便实现导航、
定位、授时等功能。这项技术可以用
来引导飞机、船舶、车辆以及个人，
安全、准确地沿着选定的路线，准时
到达目的地。
学情展示
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。教师可根据生成问题适当点拨，幻灯片展示重点短语和句型，请学生熟记。
师后教：重点点拨：This method worked well at night as long as the weather was good and the stars could be seen.
work well --- (方法)可行, (物品)正常工作
as long as = so long as --- 只要(引导条件状语从句)
could be seen. 情态动词的被动语态：能被看见
.in …direction 按/朝……方向
1. How did the early explorers know where they were
They found out where they were by using stars.
2. What’s the disadvantage of using the stars as guiding marks
Its disadvantage is that it didn’t work well when the weather was bad and the stars could not be seen.
3. What is a GPS Is it useful to use
It is like a man-made star. We can use it at any time, in any place and in any weather to find out our position. It is very useful.
4. What do you think the GPS will be used for in the future
…
Read the passage and discuss the questions on Page88.
Key words
explore
explorer, mark
find out, in…direction
work well, as long as
the rest of the time
solve, like, use, the shape of
great invention
n.标示，记号，符号
v.做记号，做标记
Retell it !
根据首字母提示，完成短文。
Thanks to GPS, we can exactly know w _____we are now. GPS is like a man-made “star”. It can be u____ in any place and any weather condition to find out our p________. In the past, the early explorers had to use stars in the s____ to tell them where they were, however, this method didn’t work well when the weather was bad. So GPS is a great invention that can help humans to better e________ our planets.
here
osition
sed
ky
xplore
Grammar
Passive Voice (Ⅱ)
The radio was invented by Guglielmo Marconi
in 1895.
When was the digital camera developed
Where was it developed
What is a rocket used for
It was developed in the 1970s.
It was developed in Japan.
It is used for sending satellites or spaceships into space.
Functions
I wish I could go into space some day.
I hope your dream will come true.
It’s said that he invented more than two thousand things during his life.
Inventing is interesting and exciting and everyone can be an inventor.
Passive voice was /were +done
( ) 1. A big supermarket _____in our city last year.
A. is built B. were built C. was built
( ) 2.Could you tell me who the radio ____ by
A. invents B. invented C. was invented
( ) 3. Many trees and flowers _____ in our school last year.
They made our school more beautiful.
A. have planted B. were planted C. planted
( ) 4.The children ____ swim last month and they can swim
very well now.
A. are taught B. were taught C. were taught to
( ) 5.It is said that potato chips _____by mistake about one
hundred years ago.
A. were invented B. invented C. are invented
C
B
C
A
C
Grammar exercise
1.You are late, all the tickets __________(sell) out an hour ago.
2.This type of cellphone ____________(make )in Shenzhen.
3. I _________________ ( not invite) to yesterday’s party.
4. ________ those machines __________(check) this morning
5. Many trees and flowers ______________(plant) in our school last year, and they made our school a beautiful garden.
were sold
were made
were/was + v.的过去分词
wasn’t invited
Were
checked
were planted
1.People use radios to learn English in the past.
_____________________________________________
2.Jack will show me the photo.
______________________________________________
3.They have raised much money for the Project Hope.
______________________________________________
4.I often hear Mary sing English songs at home.
_______________________________________________
5.We mustn’t throw litter about.
________________________________________________
6.People can visit planets like Mars.
_________________________________________________
Radios were used to learn English in the past.
The photo will be shown to me.
Much money has been raised for the Project Hope.
Mary is often heard to sing English songs at home.
Litter mustn’t be thrown about.
Planets like Mars can be visited.
Change the following sentences into Passive Voice.
( ) 1.Hurry up, you ____ on the phone.
A. Wanted B. was wanted C. are wanted
( ) 2. Some stories _____the children by the teacher
everyday.
A. is told for B. are told for C. are told to
( ) 3._____that he has studied abroad for five years.
A. It is said B. It says C. That is said
( ) 4.The window ____ five minutes ago.
A. is cleaned B. was cleaned C. can be cleaned
( ) 5.The children ______by the teachers at school.
A. take care of B. are taken care
C. are taken care of
C
C
A
B
C
Choose the best answer.
( ) 6. I have no idea what ______while I was asleep.
A. happened B. was happened C. happens
( ) 7. In some countries, tea _____before meals.
A. is serving B. is served C. served
( ) 8. This kind of books ______well.
A. doesn’t sell B. isn’t selling C. aren’t sold.
( ) 9. I ______ten minutes to decide which sentence was
right by the teacher.
A. gave B. was given C. was giving
( ) 10. Teachers ______in every part of the world.
A. are needing B. are needed C. will need
A
B
A
B
B
We Learn: 1. Some words : mark, explorer
2. Some phrases: find out, in …, direction,
as long as, work well, the rest of the time,
be used to, the shape of
3. Some sentences:
This method worked well at night as long
as the weather was good and the stars could be seen.
We can: 1. Use the passive voice of the simple past tense more
properly.
2.Talk about new technology GPS.
3. Develope our imagination and creativity by
designing our own inventions.
Thank you
