2．阅读理解对话并在文中勾画出生词和短语，完成预习自测题目。
3．将预习中不能解决的问题标注出来，并填写到后面“我的疑惑”处，1 5分钟独立完成。
II.教材助读 I.预习导学 一、词汇精粹 学习建议仔细阅读听力题，找出重点单词、短语和句型。
在听力材料中勾画出单词、短语、句型和交际用语，并结合语境猜其含义。
一、听力预测 一 记单词，扫清听力障碍。
1．by mistake ____________ 2．not thin enough __________ 3．in the end _____________ 4．a chef called ____________ j．sprinkle ____________ 6．accident _____________ 7．in bad mood _______________ When were potato chips invented________ A．In 1 997． B．In 1853． C．In 1857． 二、阅读对话找出重点单词、短语。
1．crispy 2．salty 3．sour 4．by mistake 5．谁发明了它 我的疑惑预习中不能解决的问题写下来，供课堂解决。
_______________________________________________ 【探究案】 导入新课 Have a survey．Can you list the words that describe how food tastes egsour，salty，sweet I．洗耳运动 Answer the questions 1Who invented potato chips _______________________ 2Did the customers hate the thin potato chips A．No，they didn’t． B．Yes，they did． Ⅱ．角色表演 教学建议老师给学生时间，让学生自由展示，给学生提供一个引发他们的想象力， 灵活用语言表达自己思想平台。
学习建议朗读对话，熬练掌握描述食物的表达方式， 然后两人一组分角色表演对话。
Pairwork仿照例句进行对话。
egADid you know potato chips were invented by mistake BWow，I didn’t know who invented them A Ⅲ．质疑探究--一一质疑解疑、合作探究 1．by mistake错误地 1Potato chips were invented by mistake．炸薯片无意中被发明。
2They made lots of mistakes．他们犯了许多错误 3I often mistake Mike for Mark．Theyre similar to each other．我经常错把迈克当马克，他们很像。
思考make a mistake________ ；
________________把.错认成... 2．in the end最后；
终于 1The customer was happy in the end／at last／ finally．最后顾客高兴了。
2At the end of the street，I found my wallet．在路尽头，我找到了我的钱包。
3At the end of the day，our monintor cleaned the school bus．傍晚时分，我们的班长打扫了校车。
4By the end of last year，we had learned 3。000 English words．到去年年底，我们已经学了3，000 个英语单词。
5By the end of the year 2020,China will have built 7 railways like this．截止到2020年年底，中国将会建成7条这样的铁路。
思考1in the end可以用哪些词或短语代替___________________ 2in the end／at the end of／by the end of有什么区别in the end 后不跟______意为“最后”；
by the end of意为“____________”，常与过去完成时或将来完成时连用；
_____________ 意为“在 末尾”，常与一般过去时连用。
3．George Crum cooked them for a long time until they were crispy．乔治克拉姆烹饪了很长时间直到它们很脆。
思考until意为“直到才；
不到不”。用于句中时，有两种句式需要注意。
JWe will wait until you come back．我们会等着，直到你回来。wait是延续性动词，因此其结构之一是 _________动词until其他。
2We won’t begin until you come．你不来我们不会开始。begin是瞬间动词，因此其结构之二是 ______ _______ 动词until其他。
即时练习 1．翻译 1我错拿了你的钢笔。
______________________________ 2我不来你别走。
_______ ________ until I arrive． 3他们一直唱到深夜。They________ ________ midnight． 2．填入恰当的介词in／at／by 1______the end，Wang Ping got to the village． 2We will have finished the work ______ the end of this year． 3Walk along the street，and you’11 find the Hospital_____ the end of the street． 学以致用拓展提升 教学建议教师给学生2分时间思考．_让其充分发挥想象力，2分后让学生自由展示。
学习建议运用本节所学的语言现象和重点句型编写对话，询问发明的事情。
提示问题1．What do you think is the most helpful invention 2．Who invented it 3．When was it invented 以组为单位编写对话，小组内必须人人参与。
V．总结反刍 学习建议 回顾本节课内容，对重点单词、短语、句型、语法及听力进行二次领会和记忆。
课堂小结本节课学习了词组by mistake，in the end，注意相关短语及用法。请大家将探究点中的例句记熟。
Ⅵ．课后学习指导 1．牢记Section B1a一2c单词和短语并灵活运用。
2．预习并完成Section B3a一4h预习案。
温馨提示鉴于英语学科的特殊性。此{果时的课后作业一为“探究案中”课后学习指导；
二为下一课时的“预习案和‘探究案”。
[训练案] 一．单项选择每小题1分，共14分 Do you know when the noblade fan 无叶风扇____ 一On 0ctober 12，2020． A．invented B．invents C．was invented D．is invented 2．I took the wrong train ______I didn’t even know it until half an hour later。
A．by mistakes B．by mistake C．with mistake D．with mistakes ’ 3．1 noticed them ______the teachers’office Just now． A．went into B．go into C．was going into D．came out of 4．一-Surfing first started Oil the island of Hawaii，didn’t it 一Yes，but now it ______ by people all over the world． A．is enjoyed B．is enjoying C．has enjoyed D．will enjoy 5．一______，you can find out the truth easily． 一I understand．Thank you． A．On the way B．In this way C．By the way D．In a way 6．I made some tea a moment ago．Let’s_____ it together． A．sound B．smell C．remain D．taste 7．After the teacher Tan Qianqiu’s story_____ on CCTV，many people are learning from him． A．was reporting B．was reported C．reported D．was report 8．We want to buy some silk _______in Suzhou． A．produce B．produced C．is produced D．is producing 9． ______the ancient Chinese history，the emperor Qianlong made a great contribution贡献to his dynasty． A．Thanks to B．According to C．Thanks for D．Because of 10．Don’t speak while ______dinner． A．eat B．eate C．ate D．eating 11．“What a ______ trip”The boy said to me，“I’m with your company．’’ A．pleasant；
pleased B．pleased；
pleasant C．pleased；
pleased D．pleasant；
pleasure 1 2．Luckily，we ______ four teams instead of three． A．are divide into B．were divided by C．were d