1. When was it invented? The second period Unit 9

2. 3a PAIRWORK Make a list of five helpful inventions and five annoying inventions. Helpful inventions Annoying inventions example telephone 1. __________ 2. __________ 3. __________ 4. __________ 5. __________ example alarm clock 1. __________ 2. __________ 3. __________ 4. __________ 5. __________ vacuum cleaner television car computer fax machineair-conditioner truck hair dryer junk food ice cream

3. Explanation: 1. annoying adj. 讨厌的, 恼人的 ( 往往指事物 ) My father is annoyed with me. 爸爸在生我的气。 e.g. annoyed adj. 生气的, 恼怒的 ( 往往指人 ) Electric hair dryer is an annoying invention. 电吹风是个讨厌的发明物。 e.g.

4. 2. helpful adj. 有用的，有帮助的 e.g. Computer is very helpful in modern society. 电脑在当今社会非常有用。

5. Model 1 A: What is this? B: It is an alarm clock. A: What is it used for? B: It is used for waking people up in the morning. A: Do you think it is annoying? B: Sometimes, when I want to go on sleep.

6. Model 2 A: What is this? B: It is a light bulb. A: What is it used for? B: It is used for giving light. A: Do you think it is helpful? B: Yes, I think so. Because I always do homework and read books in the evening by its light.

7. Model 3 A: What is this? B: It is a microwave oven. A: What is it used for? B: It is used for heating cold food and cooking meals. A: Do you think it is helpful? B: Yes, I think so. Because my parents are very busy and I can use it to cook meals by myself.

8. A: What do you think is the most helpful invention? B: I think the most helpful invention is the vacuum cleaner. A: Why is that? B: Well, it can help me clean the floor when mother asks me to do the cleaning. 3b PAIRWORK Discuss your opinion in activity 3a with your partner. Model 1

9. A: What do you think is the most annoying invention? B: I think the most annoying invention is the air-conditioner. A: Why is that? B: Well, I feel uncomfortable in the room with an air-conditioner. Model 2

10. 4 GROUPWORK Choose five inventions you would like to have if you are alone on an island. A: I’d like to have a radio because I could listen to music all day. B: Yes, but that’s not going to help you leave the island. I think it would be better to have … Model 1

11. A: I’d like to have some matches because I could light a fire to keep warm. B: Yes, but that’s not going to help you leave the island. I think it would be better to have a cell phone. Model 2

12. A: I’d like to have a telescope because I could look far. B: Yes, but that’s not going to help you leave the island. I think it would be better to have a signal lamp. Model 3

13. Exercise

14. 1. The TV ___________ (invent) around 1927. 2. They are used for ______ (see) in the park. 3. This kite _________ (make) by Uncle Wang. 4. Tea _____________ (discover) a long time ago. 5. Our classroom ________________ (should clean) every day. was invented seeing was made was discovered should be cleaned II. 用所给动词的适当形式填空：

15. 1. ______ ____ the computer ________ ( 什么时 候发明的 ) ？ 2. ____ was the car ________ ___ ( 谁发明的 ) ？ 3. A pen ___ ____ ____ ( 用来做 ) writing. 4. What do you think is ____ _____ _______ _________ ( 最有帮助的发明 ) ？ 5. He said the fish was ____ ______ ( 足够咸 ) 。 When was is used for invention the most helpful salty enough Who invented by invented III. 根据汉语完成句子：

16. HOMEWORK 1. Continue finding out some useful and annoying inventions. 2.Preview Section B 1a / 1b.