分母let美人3

题目KeeptheCandleBurning!
年级学科九年级课型信息技术与学科整合课授课教师王娜工作单位天明初级中学教学目标WordsandexpressionsDoandexpresstheexperimentLovescience教学重难点关键重点词汇:match,light,burn,useup,candleholder,shallow,oxygen,one-fifth,makesbdo重点句型:1.
Fillthedishhalffullofwater2.
Tomakeacandleburn,youlightit教学方法Talk,listen,read,practice运用的信息技术工具硬件:多媒体,白板软件:课件PPT教学设计思路1)分数由分子及分母两部分构成.
用英语表达时,分子用基数词,分母用序数词.
2)若分子为1,则分母的序数词为单数形式,若分子大于1,则分母的序数词用复数形式.

3)=one(a)half或onesecond(one-second)=one(a)quarter或one-quarter教学过程设计意图时间安排Step1.
Greetings.
Step2.
Thinkaboutit.
1,DoyouthinkscienceisinterestingWhyorwhynot2,NameoneortwofamousChinesescientists.
WhatdoyouknowaboutthemStep3.
Showstudentsthepicturestoletthemknowtheprocessofthisexperiment.
Step4.
ReadandfillintheblanksReadthetextandfillintheblanks:Let'sdotheexperimenttogether!
Putthecandleinthecandleholder.
Putthecandleholderonthedish.
Fillthedishhalffullwithwater.
Lightthecandlewithaoralighter.
WhatcanyouseeThecandleisburning.
thecandleburnfortwoorthreeminutes.
Thencarefullyputthejaroverituntilthetopofthejarrestsonthedish.
Asthecandleburns,ittheoxygenintheair.
Whenthecandlestopsithasusedupalltheoxygenintheair.
Thewaterinsidethejarandfillsaboutofthejar.
Thisisbecauseaboutonefifthoftheairismadeupofoxygen.
Step5.
LanguagePoints1.
分数的表达1)分数由分子及分母两部分构成.
用英语表达时,分子用基数词,分母用序数词.
2)若分子为1,则分母的序数词为单数形式,若分子大于1,则分母的序数词用复数形式.

3)=one(a)half或onesecond(one-second)4)one(a)quarter或one-quarterStep6.
Doanexperiment.
Cananegg"swim"inthewaterFirst,putsomesaltintotheglass.
Then,addsomewater.
Next,mixthesaltandthewatertogether.
Finally,puttheeggintotheglass.
1,让学生做好上课的准备2,与学生进行一个简短的对话,进入本课主题.
3,通过展示图片让学生理解整个的实验过程.
4,让学生带着任务读课文5,通过教师讲解让学生对重点知识更加熟悉.
6,通过给学生做一个有趣的实验,一方面激发学生学习英语的兴趣,另一方面让学生学习用英语来描述一个实验.

1:5分钟2:5分钟3:10分钟4:10分钟5:5分钟6:5分钟板书设计分数的英语表达1)分数由分子及分母两部分构成.
用英语表达时,分子用基数词,分母用序数词.
2)若分子为1,则分母的序数词为单数形式,若分子大于1,则分母的序数词用复数形式.