Unit 4 When was it invented? Section B
级部：初四 执教人：余江南
知识目标： After learning the text, require the students to master the phrases below
(通过学习，掌握下列词语)
invent, popular drink, by accident, not…until, discover, according to, Chinese legend, boil, an open fire, fall(fell) into, remain(ed), notice(d), produce(d), in this way
能力目标：1.Practice the students’ listening ability. (听力训练)
2. Ask the students to understand the passage very well and answer some
questions according to the passage.
(能够正确理解本文含义，回答相关问题。)
3. Useful phrases for the students to retell the new text.
(利用关键词语，能够复述课文大意。)
情感态势：Train the students to use their heads and make some inventions in life.
(开动脑筋，培养发明创造能力。)
学习策略：1.chips’ history (a foreign invention) →tea(Chinese invention)
2.work in groups and solve problems together
教学流程：
Step 1 Words revision
Dictation:______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Step 2 A listening test
The history of potato chips
① _____________________that potato chips were invented by mistake?
Potato chips ②_______________by a chef called George Crum. They were invented in
③__________ .George Crum cooked them for a long time until they ④__________.And he sprinkledlots of salt on them so they were ⑤__________.
Step 3 Work in groups,read through the passage,and then answer some questions.
Step 4 Find out the following points:
1.although __________________________________________________________________
eg.用although/though 或bu t填空
__________ he is very old, he still works hard. He is very old, __________ he still works hard.
2.over在本文中的2种解释
①________________ 100多年前______________ 同义词_____________
②________________ 河上的一座桥________________
3….. three thousand years , thousands of
具体使用:________________________________________________
拓展：hundred, million
4.被动语态的使用（找出本文含有被动语态的句子，4个）
①___________________________________________________
②____________________________________________________
③____________________________________________________
④____________________________________________________
5.回顾：主动语态变被动语规则一二三。
Step 5 Retell the passage by using the key phrases.
Step 6 Exercises for training.
A.翻译下列词组：
1.被…发现 ______________________ 2.根据______________
3.在室外火炉上___________________
4.fall into___________ 5.produce a pleasant smell________________
B.完成以下各题：
1.A___________ to weather report,we are going to have a few rainy days.
2.Alice took Amy’s bag ___________________.(错误地)
3. (09青岛中考)Chen Hui __ computer games, but now he gives them up and studies hard.
A.is used to playing B.is used to play C.used to play D.is used for playing
4. (09聊城中考)Li Ming will be 12 next month.A new bike __ for him as a present. A.is bought B.was bought C.will be bought D.will buy
5.（09成都中考）人们意外发现格林先生对中国传统艺术有着很高的鉴赏能力。
Mr Green was found _____ ________ that he had a good taste for Chinese traditional art.
6.Edison invented light bulbs.(变为被动句) _____________________________
Step 7 Homework：1. 预习Reading 部分生词和课文。
2. 完成学案Section B练习。
Step 8 课后学与思：___________________________________________