2. Unit 4 Amazing Science Topic1 When was it invented? Section D 制作学校：振华中学

3. 1. 复习掌握语法 — 被动语态，并能用之去做 题。 2. 复习并背诵一些功能句。 3. 通过阅读短文，理解什么是 GPS 定位系统 及其在生活中的应用。 学习目标

4. 自学指导 1 1. 自学内容：课本 87 页 Grammar 。 2. 自学方法：背诵、观察、总结。 3. 自学时间： 5 分钟 4. 自学要求：背诵并观察句子，然后总结出被动 语态的构成规律，并能用之去做题。

5. 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.

6. 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 自学检测 1

7. 自学指导 2 自学内容：课本 87 页 Functions. 自学方法：背诵。 自学时间： 3 分钟 自学要求：能够熟练掌握这些句子.

8. 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.

9. 自学检测 2 I I could go into space some day. I your dream will come true. he invented more than two thousand things during his life. Inventing is interesting and exciting and everyone. wish hope It’s said that can be an inventor

10. 自学指导 3 自学内容：课本 87 页的短文。 自学方法：扫读。 自学时间： 3 分钟 自学要求：通过理解生词和短语，能够回答 88 页的问题。

11. 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? … 自学检测 3

12. 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 要点归纳 n. 标示，记 号，符号 v. 做记号， 做标记

13. 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 强化练习：

14. 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. 知识小结

15. ( ) 1.Hurry up, you ____ on the phone. A. WantedB. was wanted C. are wanted ( ) 2. Some stories _____the children by the teacher everyday. A. is told forB. are told for C. are told to ( ) 3._____that he has studied abroad for five years. A. It is saidB. 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 当堂训练

16. ( ) 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 servingB. is servedC. served ( ) 8. This kind of books ______well. A. doesn’t sellB. isn’t sellingC. aren’t sold. ( ) 9. I ______ten minutes to decide which sentence was right by the teacher. A. gaveB. was givenC. was giving ( ) 10. Teachers ______in every part of the world. A. are needingB. are neededC. will need A B A B B

17. Bye-bye!