Unit 4 Amazing Science Topic 1 When was it invented? Section D课件20张PPT

课件20张PPT。Unit 4 Amazing Science Topic 1 When was it invented ?Section DMany people use computers.Computers _____ ________
by _______ _________.The workers plant trees in the garden.Trees _____ _______ in the
garden ____ the workers.are usedmany peopleare plantedbyCan you try ？你认识这些好朋友吗 （英汉互译）1.explore 2.mark 3. system 4.direction 5.shape 6.planet
7.灯泡 8.机器人 9.发明 10.位置；方位
11.问题 12.解决review the grammar( page 87)找一找这四组句子的共同点是什么呢？were/was　+　v.的过去分词A: What’s the lock made of?
B: It’s made of metal.
A: What’s it used for?
B: It’s used for locking the door. n.锁 v.（用锁）锁上，被锁住2 Follow the example to make up similar conversations. lock/metalWhat’s it used for?
It’s used for communicating easily.How will you 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.
Do you know how the early explorers find their position ?Let’s use the GPS.n.探险者，
勘探者
Teaching aims:1.复习并熟记本话题的重点单词和短语。
2.复习本话题刚学过的被动语态，并根据刚学过的内容总结含有情态动词的被动语态。
3.通过本课的科普文章Where are we?的阅读，训练同学们从细节入手，培养良好的阅读习惯。
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 answer the questions on Page88.找一找，记一记1.查明；找出
2.奏效，起作用
3.其它/于时间
4.人造的
5.在任何时候
6.只要
7.可以被使用
find outwork wellThe rest of the timeman-made at any time as long as can be used火眼金睛find out the sentences with passive voice(被动语态）考点点拨；1.The stars could be seen.
2.It can be used to study the shape of the earth.
仔细观察，两个句子的构成；情态动词的被动语态构成：
情态动词+be+动词的过去分词Open your mouth ,you will succeed!
Listen and read after the tape.根据首字母提示，完成短文。
Thanks to GPS, we can 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.hereositionsedkyxploreExercise( ) 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
CBCACGrammar exercise( ) 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 CABCChoose 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
ABABBPractice makes perfect.We Learn: 1. Some words : mark, explorer
2. Some phrases: find out,
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.Summary
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 soldwere madeExerciseswasn’t invitedWerecheckedwere plantedThank you