人教版必修三模块二精编教案
2019-2020学年高中英语人教版必修三unit2全单元教案

Adjustment Space2019-2020学年高中英语人教版必修三全单元教案Unit 2Healthy Eating l. Topics: Problems with diet ;Balanced diet and nutrition2.Words and expressions3.Functionsl)Suggestions and adviceY ou must /must not...; What should I do?I think you ought to …I suppose you had better.- - Perhaps you should.Do you think you could give me some advice?2)seeing doctors What ’s the matter? What ’s wrong?What seems to be the trouble?How long have you been like this?3)Agreement and disagreement.I don ’t agree. Of cause not. I don ’t think so. All right. That ’s a good idea.No problem. Certainly /sureYes, I think so. I ’m afraid not.4. Grammar: The use of ought toYou ought to cook fresh vegetables and meat without too much fatIf you want to stay slim.You ought not to eat the same kind of food at every meal.Adjustment SpaceUnit 2Healthy Eating Period1 and 2 Step l:.GreetingsThe teacher greet the whole class.Step 2: RevisionReview some words of last period . Step 3:Warming upl.Do you eat a healthy diet? What kind of food do you usually have formeals?1 Are the food you usually eat healthy food or unhealthy food?(Discussin pairs.2. Name some healthy food and unhealthy food.Healthy food unhealthy food.All vegetables: cabbages, Fatty food: French friesPeppers tomatoes potatoes cream roast pork/lambAll fruits: apples, grapes sugary food chocolateStrawberries bananas pears sweets honey ice-cream Dairy products: cheese salty food: biscuitSeafood: shrimp cookiesTofu eggs3. Do you know that the food you eat helps you grow in different ways?Some Will make you fat/tall/thin. Look at the charm below and see which kindof food they eat areFast energy food Slow energy food Body-building food Protective foodsRice sugar Noodles potatoes Spaghetti breadSpaghetti breadCorn dumplings Butter cream Fried bread stickFried cake/chips Dairy productsQuestions:l.Which of these groups of food do you like best?2.Which of them do you eat most often?3.Do you think we should eat each kind of food?3.What will happen if you do not eat a balanced diet?Too much fatty/sugary/salty food will cause many diseases and get toofat.Only protective food will feel weak ,no energy and get too thin .Adjustment SpaceStep 4 Pre-reading Discuss the questions in the chart.(Which food contains more...)2 Order the following food from which contains most to which containslessAnswer: ice-cream, eggs, chicken, rice, peaches Step5 Fast reading and answer the following questions1. What does Wang Pengw ei’s restaurant serve?2. What about Yong Hui’s restaurant?Step 6Intensive reading and find the answers to comprehending.Step7Teaching evaluation(教学评估与反思)Unit 2Healthy Eating Period 3 Language pointsStep l. Lead-in: Listen to the tape to get a better understanding Step nguage points1. Wang Pengwei sat in his empty restaurant feeling very frustrated.feeling very frustrated 现在分词在句中作伴随状语现在分词在句中作伴随状语eg She sat on the chair reading a newspaper .(表伴随)Walking in the street, she met her old friend.(表时间) Seeing no body at home, she decided to eat outside.(表因果)The child fell, striking his head against the ground .(表结果)(表结果)2. His restaurant ought to be full of people.0ught to l , to show a moral duty表示一种道义上的责任,田该表示一种道义上的责任,田该Eg. She ought to look after her child better.1 You ought to study hard to get a high mark.2)ought to have done 表示本应该…,而却没有…Eg.You ought to have come yesterday.3. He thought of his mutton kebabs, fatty pork cooked in the hottest oil过分词短语作后置定语,表被动。
高中地理人教版必修三第三章第二节教学设计

高中地理人教版必修三
第三章第二节流域的综合开发
——以美国田纳西河流域为例
教学设计
作者:谭述亮工作单位:山东省安丘市第一中学学科:地理年级:
高二
环节一:引入新课
播放《长江之歌》歌曲视频,播放完成后呈现长江三峡大坝景观图
承接:
河流流域是人类文明的摇篮,对流域进行综合开发是人类经济活动中非常重要的一部分,在河流的利用和流域开发过程中不可避免地要产生很多问题,今天我们就以田纳西河流域的综合开发为例学习流域的综合开发与治理。
下面我们进行本堂课的第二个环节:
环节二:课前预习检查
课前预习检查,看一看同学们的自主学习效果。
板书一:一、流域和水系
PPT展示:预习检查一
指出图中河流的干流、一级支流、二级支流、分水岭、河口
(展示检查内容,学生思考的同时板书水系、流域)
提问学生评价
板书并概括水系和流域的的概念。
水系:河流的干流与支流构成了河流的水系学生观看体会长江的雄浑气势,激发爱国主义情感。
学生思考
教师板书完成后以学习小组为单位提问,让学生在大屏幕上指图说明,完成后让其他学生评价,根据回答情况和评价情况进行小组量化得分,计在黑板一侧的小组学习竞赛得
流域:河流水系所在的汇水区域就是河流的流域
分表格中。
板书二:流域开发的自然背景
PPT展示:预习检查二
学生共同回答
进行知识的巩
固
课堂教学设计学生活动设计
高中二年级
学科:地理
教案
高中地理人教版必修三
第三章第二节流域的综合开发
——以美国田纳西河流域为例
教学设计
高二三部谭述亮。
人教英语必修三Unit2全单元教案.doc

Unit 2 Healthy Eatiingi.教学内容分析本单元的中心话题是健康饮食。
主要是为了使学生对与健康有关的问题得到更好的理解。
这一单元鼓励学生去检查自己的饮食行为,看一看它是不是健康的饮食习惯。
一种健康的饮食习惯应该是平衡的,既不在脂肪、糖和盐这些方面过剩,又不会在人体必需的营养元素方面匮乏。
通过本单元的学习,学生可以对健康饮食有一个清楚的概念,从而根据所学的知识去思考与健康有关的问题。
Warming Up部分通过问题向学生询问饮食构成,让学生对本单元的內容能有一个初步的了解,并使学生复习与有关饮食的单词和短语。
然后让学生回答一组问题,通过这些问题的讨论,引导学生参与表达自己的看法,激发学生兴趣和好奇心,让学生自然而然地进入下一部分的学习。
Pre-wading部分通过几个问题讨论,让学生认识平衡营养的重要性,为课文的学习做出铺垫。
Reading部分主要讲述了王鹏和咏慧开饭店的故事,借此揭示了不同食物对人体有着不同的影响。
故事讲诉了王鹏和咏慧两家饭店的两种饮食都是不合理的,经常去王鹏的饭店容易发胖,这样会导致高血压和心脏病等疾病;而经常去咏慧的饭店的顾客则容易变瘦,这样容易导致厌食或是营养不良,让学生注意并避免走这两种极端。
这些距离学生自身生活很接近的问题很容易引起学生的思考。
在教授的过程中注意积极的引导学生不断的进行反思。
Comprehending第一部分通过True or False第四部分通过Main idea的寻找,使学生对文章有了一个浅层的理解。
Learning about Language部分突岀了词汇和语法的学习与训练。
本单元的语法是情态动词ought to等的基本用法。
Using Language部分中包括了听、说、读、写几个部分的内容。
学生可通过王鹏和咏慧的这一个事情,深入展开讨论与健康饮食有关的事情。
阅读后的习题及讨论不仅帮助学生加深对文章主旨大意的理解,更重要的是让学生学会用所学的知识,解决在现实生活中遇到的问题。
人教版英语必修三Unit2课时学习方案教学设计【DOC范文整理】

人教版英语必修三Unit2课时学习方案教学设计Unit2设计1课时以听说为主的基于学习方案的教学设计。
项目内容教学内容一段录音,讲述王鹏去图书馆寻找健康饮食的资料,巧遇这方面的专家,于是向这个专家请教。
通过这段录音,引发学生对合理搭配饮食的讨论。
学习目标从以下学习目标中确定四类、每类至少一项作为自己的本课时学习目标。
语言知识使学生对合理、健康饮食有更深入地了解及如何合理搭配食物。
语言技能通过听力口语等各种活动,训练学生提取信息,表达观点的能力。
语言运用学会在听力中抓住要点的技巧学会把听到的内容用自己的语言表达出来。
文化意识了解合理搭配饮食的重要性,提高学生健康饮食的意识。
情感态度在了解合理搭配饮食的重要性的同时,也注意生活和学习上的合理安排。
学习策略自主地在新旧语言知识之间建立联系,自主反思本单元所学到的语言知识和技能,将之迁移并运用到要学习中,主动拓展与本单元主题相关的信息。
任务课时任务:听一段录音,获取相关语言信息,再把这些信息运用在口语活动中,给一个胖女孩提一些饮食方面的建议。
评价标准从以下标准中选定至少两项作为你本单元学习的评价标准。
理解听力材料的大概内容。
能把所听到的信息运用到口语中。
借助同伴的启示与帮助,更好的完成任务。
学习资源听力材料预设时间学习步骤学习目的教学方案学习方案学习资第1-5’导入引入听力老师会用两个问题”hichillnessdoestillhavetoday?“and “hyehavethisillness?”引导学生进入听力材料,让学生对接下来的听力训练的内容有一个心里准备。
用问题激发学生的讨论,从而激发学生对回答问题及相关知识的联想。
学生通过讨论为接下来的听力任务做好背景知识准备。
教师话语第6-21’听力进入听力训练,本课时的重点之一有了前面两个问题引入,再加上前面学过的READING部分,教师可以直接进入主题。
让学生听一段录音之后,学生完成几个简单的问题,再听一遍录音,再完成几个细节题,循序渐进,由浅入深,学生可以大概获取听力材料的信息。
人教版高中英语必修三unit2教案 最终版

1.KnowledgeObjectives
1.Get studentsto learn to use some of the key words and phrases of this unit .
2. Understand the role of various foods on the human body and candistinguish whichis a healthy diet, which is not.
2.Ability Objectives
1.Enable students toexpress their own views and suggestions on the practical problems encountered around them.
2. Can skim the text, find and process the relevant information in the text,according to the text content to answer some questions.
e different reading strategies to understand and analyze the text.
2.Teaching Difficult Points
e different reading strategies to understand and analyze the text.
This lesson is based on the reading partCome and Eat Hereof student textbooks which comes from the high school English compulsory book three unit twoHealthy Eating.The text mainly describes the competition between Wang Peng and Yong Hui, who are both operating restaurant,meanwhile,describes the so-called concept of healthy eating.Through the whole learning of the unit,students will understand the role of various foods on the human body,what’s more,teacher will also guide students to pay attention to a balanced diet and encourage students to develop healthy eating habits.
统编人教版高中必修第三册物理《2 导体的电阻》集体备课教案教学设计

2导体的电阻[学习目标] 1.了解电阻的定义式及电阻的意义.(重点)2.通过对决定导体电阻的因素的探究,体会控制变量法.(难点)3.掌握决定导体的因素及计算公式.(重点)4.理解电阻率的概念及物理意义,了解电阻率与温度的关系.一、欧姆定律1.电阻(1)定义:导体两端的电压与通过导体电流的比值叫作电阻,即R=U I.(2)意义:反映导体对电流的阻碍作用.(3)单位:欧姆(Ω)、千欧(kΩ)、兆欧(MΩ)1 kΩ=103Ω;1 MΩ=106Ω.2.欧姆定律(1)内容:导体中的电流跟导体两端的电压U成正比,跟导体的电阻R成反比.(2)公式:I=U R.(3)适用条件:适用于金属导电和电解质溶液导电.对气态导体和半导体元件不适用.二、影响导体电阻的因素1.实验探究项目内容实验目的探究导体电阻与长度、横截面积、材料的关系实验电路实验方法控制变量法实验原理串联的a、b、c、d电流相同,电压与导体的电阻成正比,测量出它们的电压就可知道它们的电阻比,从而分析出影响导体电阻大小的有关因素(1)导体电阻与长度的关系:一条导线可看成有相同长度的多段导线串联,由串联电路的性质可分析出导体的电阻R∝l.(2)导体电阻与横截面积的关系:多条长度、材料、横截面积都相同的导体紧紧束在一起,由并联电路的性质分析出导体的电阻R∝1S.(3)导体电阻与材料的关系:由实验探究得到长度、横截面积相同而材料不同的导体电阻不同.三、电阻定律1.内容:同种材料的导体,其电阻R与它的长度l成正比,与它的横截面积S成反比;导体电阻还与构成它的材料有关.2.公式:R=ρlS.3.符号意义:l表示导体沿电流方向的长度,S表示垂直于电流方向的横截面积,ρ是电阻率,表征材料的导电性能.4.材料特性应用(1)连接电路的导线一般用电阻率小的金属制作.(2)金属的电阻率随温度的升高而增大,可用来制作电阻温度计,精密的电阻温度计用铂制作.(3)有些合金的电阻率几乎不受温度变化的影响,常用来制作标准电阻.四、电阻率1.物理意义:ρ反映了材料导电性能的好坏.电阻率越小,导电性能越好.2.单位:国际单位——欧姆·米,符号是Ω·m.3.决定因素:电阻率ρ由材料自身的特性和温度决定.纯金属的电阻率较小,合金的电阻率较大.1.思考判断(正确的打“√”,错误的打“×”)(1)由R=UI可知,导体的电阻跟导体两端的电压成正比,跟导体中的电流成反比. (×)(2)电阻率ρ与导体的长度L和横截面积S有关.(×)(3)电阻率表征了材料的导电能力的强弱,由导体的材料决定,且与温度有关. (√)(4)电阻率大的导体,电阻一定很大.(×)2.如图所示,a、b、c为同一种材料做成的电阻,b与a的长度相等,b的横截面积是a的两倍;c与a的横截面积相等,c的长度是a的两倍.当开关闭合后,三个理想电压表的示数关系是()A.V1的示数是V3的2倍B.V1的示数是V2的2倍C.V2的示数是V1的2倍D.V2的示数是V3的2倍B[由R=ρlS,a、b、c的电阻之比为R1∶R2∶R3=2∶1∶4,三者串联,电流相等,则电压比等于电阻比,选项B正确.]3.神经系统中,把神经纤维分为有髓鞘和无髓鞘两大类,现代生物学认为,髓鞘是由多层类脂物质——髓质累积而成的,具有很大的电阻,经实验测得髓质的电阻率为ρ=8×106Ω·m.某生物体中的某段髓质神经纤维可看作高20 cm、半径为4 cm的圆柱体,当在其两端加上电压U=100 V时,该神经开始发生反应,则引起该神经纤维产生感觉的最小电流为()A.0.31 μA B.0.62 μAC.0.15 μA D.0.43 μAA[由R=ρlS ,可知R=3.18×108Ω,所以I=UR≈0.31 μA,A正确.]对欧姆定律的理解1.欧姆定律的适用情况欧姆定律仅适用于纯电阻(将电能全部转化为内能)电路.非纯电阻(电能的一部分转化为内能)电路不适用.2.欧姆定律的两性(1)同体性:表达式I =U R 中的三个物理量U 、I 、R 对应于同一段电路或导体.(2)同时性:三个物理量U 、I 、R 对应于同一时刻.3.公式I =U R 和R =U I 的比较【例1】 若加在某导体两端的电压为原来的35时,导体中的电流减小了0.4 A .如果所加电压变为原来的2倍,则导体中的电流多大?思路点拨:(1)不特别说明认为导体的电阻不变.(2)每次改变电压后对应的U 、I 比值不变.(3)对应同一导体,有U I =ΔU ΔI. [解析] 解法一:设原来的电压为U 0,电流为I 0,导体的电阻为R ,由欧姆定律得R =U 0I 0=35U 0I 0-0.4 A 解得I 0=1.0 A电压变为原来的2倍后,R =U 0I 0=2U 0I 所以I =2I 0=2.0 A. 解法二:根据同一电阻电压的变化量与电流的变化量之比相等,有⎝ ⎛⎭⎪⎫1-35U 00.4 A =U 0I 0解得I 0=1 A又R =U 0I 0=2U 0I 联立得I =2I 0=2.0 A.[答案] 2.0 A对公式I =U R 和R =U I 的两点提醒(1)欧姆定律的表达式是I =U R ,而公式R =U I 应该理解成电阻的比值定义式,比值定义的魅力就在于被定义的物理量与比值中的那两个物理量无关.(2)R =U I 告诉了我们一种测量导体电阻的方法,即伏安法.(3)对于定值电阻,由于U -I 图象为过原点的直线,故R =ΔU ΔI.1.(多选)根据欧姆定律,下列说法中正确的是( )A .由关系式U =IR 可知,导体两端的电压U 由通过它的电流I 和它的电阻R 共同决定B .由关系式R =U I 可知,导体的电阻跟导体两端的电压成正比,跟导体中的电流成反比C.由关系式I=U R可知,导体中电流跟导体两端的电压成正比,跟导体的电阻成反比D.由关系式R=UI可知,对一个确定的导体来说,所加的电压跟通过导体的电流的比值是一定值CD[U=IR和I=UR的意义不同,可以说I由U和R共同决定,但不能说U由I和R共同决定,因为电流产生的条件是导体两端存在电势差,A错误,C正确;可以利用R=UI计算导体的电阻,但R与U和I无关,B错误,D正确.]对电阻定律的理解和应用(1)公式R=ρlS是导体电阻的决定式,如图所示为一块长方体铁块,若通过电流为I1,则R1=ρabc;若通过电流为I2,则R2=ρcab.(2)适用条件:温度一定,粗细均匀的金属导体或浓度均匀的电解质溶液.(3)电阻定律是通过大量实验得出的规律.2.R=ρlS与R=UI的比较公式R=ρlS R=UI区别电阻的决定式电阻的定义式说明了电阻由导体的哪些因素决定,可以说R与l成正比,与S成反比提供了求电阻的方法,并不能说电阻与U和I有关系只适用于粗细均匀的金属导体或浓度均匀的电解液、等离子体适用于纯电阻元件联系R=ρlS对R=UI补充说明了导体的电阻不取决于U和I,而是取决于导体本身的材料、长度和横截面积【例2】 两根完全相同的金属导线A 和B ,如果把其中的一根A 均匀拉长到原来的两倍,把另一根导线对折后绞合起来,则它们的电阻之比为多少?思路点拨:(1)导线拉长2倍后,导线的ρ不变,l 变为原来2倍,体积不变,S 变为原来的12. (2)R 、ρ、l 、S 满足R =ρl S .[解析] 金属导线原来的电阻为R =ρl S ,拉长后l ′=2l ,因为体积V =lS 不变,所以S ′=S 2,R ′=ρl ′S ′=4ρl S =4R . 对折后l ″=l 2,S ″=2S ,所以R ″=ρl ″S ″=ρ·l /22S =R 4,则R ′∶R ″=16∶1. [答案] 16∶1上例中,若将变化后的A 、B 两个导线串联在同一电路中,则它两端的电压之比为多少?提示:两电阻串联时,电压之比等于电阻之比,故电压之比为16∶1.应用R =ρl S 解题的技巧(1)明确导体的形状改变后,电阻率不会发生变化.(2)导体的形状改变后,体积不变,由V =l 1S 1=l 2S 2确定l 2与l 1、S 2与S 1的关系.(3)由R =ρl S 确定电阻关系.2.如图所示,厚薄均匀的矩形金属薄片边长ab =2bc .当将A 与B 接入电压为U 的电路中时,电流为I ;若将C 与D接入电压为U 的电路中,则电流为( )A .4IB .2I C.12I D .14I A [设沿AB 方向的横截面积为S 1,沿CD 方向的横截面积为S 2,则有S 1S 2=12,AB 接入电路时电阻为R 1,CD 接入电路时电阻为R 2,则有R 1R 2=ρl abS 1ρl bc S 2=41,由欧姆定律得电流之比I 1I 2=R 2R 1=14,解得I 2=4I 1=4I ,故A 正确.]电阻R 和电阻率ρ的比较电阻R 电阻率ρ 物理意义 反映导体对电流的阻碍作用大小,R 大,阻碍作用大 反映材料导电性能的好坏,ρ大,导电性能差决定因素由导体的材料、长度和横截面积 由导体的材料、温度决定,与导体的形状无关 单位欧姆(Ω) 欧姆·米(Ω·m) 联系 ρ大,R 不一定大,导体对电流阻碍作用不一定大;R 大,ρ不一定大,导电性能不一定差A .导体对电流的阻碍作用叫作导体的电阻,因此,只有导体有电流通过时才具有电阻B .由R =U I 可知,导体的电阻跟导体两端的电压成正比,跟导体中的电流成反比C .将一根导线一分为二,则半根导线的电阻和电阻率都是原来的二分之一D.某些金属、合金和化合物的电阻率随温度降低会突然减小为零D[导体的电阻率由材料本身性质决定,并随温度变化而变化,导体的电阻与长度、横截面积有关,与导体两端电压及导体中电流大小无关,A、B、C错;电阻率反映材料的导电性能,电阻率常与温度有关,存在超导现象,D对.]电阻与电阻率的辨析(1)导体的电阻越大,说明导体对电流的阻碍作用越大,不能说明导体的电阻率一定越大.(2)电阻率越大,材料的导电性能越差,但用这种材料制成的电阻不一定大,决定电阻大小的因素和决定电阻率大小的因素是不同的.3.(多选)下列关于电阻率的说法中正确的是()A.电阻率与导体的长度和横截面积有关B.电阻率由导体的材料决定,且与温度有关C.电阻率大的导体,电阻一定大D.有些合金的电阻率几乎不受温度变化的影响,可用来制成标准电阻BD[材料是决定电阻率大小的主要因素,另外电阻率还与温度有关,A错,B对;由ρ=RSl知,导体的电阻大小与电阻率、导体的长度和横截面积都有关系,电阻率大的导体,电阻不一定大,C错;有些合金的电阻率(如锰铜合金)几乎不受温度变化的影响,可用来制成标准电阻,D对.]课堂小结知识脉络1.电阻的定义及物理意义.2.对电阻及电阻定律的理解与应用.3.区分电阻与电阻率.1.(多选)关于电阻率ρ=RSl,下列说法中正确的是()A.ρ与导体的长度l成反比,与导体的电阻R和横截面积S成正比B.ρ与导体的材料有关C.合金的电阻率大于纯金属的电阻率D.温度升高时,金属导体的电阻率增大BCD[电阻率ρ反映材料导电性能的强弱,与材料、温度等有关,选项B、C、D正确.]2.某同学对四个电阻各进行了一次测量,把每个电阻两端的电压和通过它的电流在U-I坐标系中的描点如图,分别用R a、R b、R c、R d代表电阻的阻值,则()A.R a>R d B.R d>R aC.R c>R b D.R b>R cA[连接aO、bO、cO、dO,U-I图线的斜率表示电阻的大小,故R a>R d,A正确,B错误;又因为O、b、c三点在一条直线上,故R b=R c,故C、D错误.]3.(多选)对于常温下一根阻值为R的均匀金属丝,下列说法中正确的是()A.常温下,若将金属丝均匀拉长为原来的10倍,则电阻变为10RB.常温下,若将金属丝从中点对折起来,电阻变为1 4RC.给金属丝加上逐渐从零增大到U0的电压,则任一状态下的UI值不变D.把金属丝温度降低到绝对零度附近,电阻率会突然变为零的现象称为超导现象BD[设原电阻R=ρlS,当l′=10l时,由体积不变原理求得横截面积变成S′=110S,所以电阻变为R′=ρl′S′=ρ10l110S=100R,A错误;从中点对折起来,相当于两个阻值为12R的电阻并联,其总阻值为14R,B正确;金属丝的电阻率ρ随温度升高而增大,当金属丝两端的电压逐渐增大时,由于电流的热效应会使电阻率ρ随温度升高而增大,因而R=ρlS =UI将逐渐增大,C错误;金属丝的电阻率随温度的降低而减小,把金属丝温度降低到绝对零度附近,电阻率会突然变为零的现象称为超导现象,D正确.]4.A、B是两根长度相同、质量相同而材料不同的金属导线,已知A的密度比B的大,A的电阻率比B的小,则A、B两根导线的电阻的大小关系为() A.R A>R B B.R A<R BC.R A=R B D.无法判断D[质量相等,A的密度比B的大,则A的体积比B的小,而长度相等,故A的横截面积比B的小.由电阻定律R=ρlS,A的电阻率比B的小,但A的横截面积也比B的小,故无法确定A、B两根导线的电阻的大小关系.选项D 正确.]5.工业上采用一种称为“电导仪”的仪器测量液体的电阻率,其中一个关键部件如图所示,A、B是两片面积均为1 cm2的正方形铂片,间距为d=1 cm,把它们浸在待测液体中,若通过两根引线加上U=6 V的电压时,测出电流I=1 μA,则这种液体的电阻率为多少?[解析] R =U I =610-6 Ω=6×106 Ω 由题意知l =d =10-2 m ,S =10-4 m 2由R =ρl S 得ρ=RS l =6×106×10-410-2 Ω·m =6×104 Ω·m. [答案] 6×104 Ω·m6.相距40 km 的A 、B 两地架设两条输电线,电阻共为800 Ω.如果在A 、B 间的某处发生短路,如图所示.这时接在A 处的电压表示数为10 V ,电流表示数为40 mA.求发生短路点相距A 有多远.[解析] A 、B 间距离l =40 km ,导线总长2l ,总电阻R =800 Ω.设A 与短路处距离x ,导线总长2x ,总电阻R x .由欧姆定律:R x =U I =1040×10-3 Ω=250 Ω 由电阻公式:R =ρ2l S ,R x =ρ2x S ,得:x =R x R l =250800×40 km =12.5 km. 即短路处距A 端12.5 km.[答案] 12.5 km。
2019-2020学年高中英语人教版必修三unit2 Reading教案设计

2019-2020学年高中英语人教版必修三Teaching Plan for Reading in Unit 2 Healthy eating一、教学目标:1.Knowledge aim :(1)To learn something about healthy eating.(2)To make sure the students have a full understanding of the text.(3)To guide the students to have a discussion about healthy eating.2.Ability aims :(1)To develop the students’ reading skills(2)To improve the ability of the students’ reading comprehension(3)To improve the students’ English speaking ability3.Affective aim :(1)To enable the students to understand the best way to make sure that they will feeland look fine is to develop healthy eating habits by learning the reading text.(2)To educate the students to work together to finish some tasks.(3)To arouse the students’interest in learning English through various activities inclass.二、教材分析:1. 重点:(1)To learn something about healthy eating(2)To develop the students’ reading skills(3)To enable the students to understand the best way to make sure that they will feeland look fine is to develop healthy eating habits by learning the reading text2. 难点:(1)To improve the ability of the students’ reading comprehension(2)To improve the students’ English speaking ability(3)To enable the students to voice their opinions freely.3. 教具:(1) A blackbroad (2) A recorder三、教学程序:Step 1. Waming-up :1. Ask the students some questions about their diet?(1)What did you have for breakfast?(2)Do you like hamburger/ fried chicken?(3)Do you like eating fruits? What are they?2. Let the students look at the pictures on P9, and let them speak out all the name of thefoods shown in the pictures. Then ask them the following questions and explain eachkind of foods to them.(1)Which kind of foods do you like best?(2)Which of them do you eat most often?(3)Do you like all kinds of them?(4)What will happen if we don’t eat a balan ced diet?Step 2.Pre-reading : some food for the students and let them decide if it is junk food or healthyfood.Then explain the meaning of junk food.2.Talking and sharing: Let the students work in groups of four and tell their groupmates the food they like to eat. Then fill in the blanks and decide what are junk food ornot.Step 3.Fast-reading :1.Skimming : Get the students to look through the title, the last paragraph and pictues,and then guess the main idea of the text.2.Listening : Listen to the recording of the text HEALTHY EATING, and then get themain idea of the text.3.Scanning : Give the students 5 minutes to read the text quickly and finish Execise 1 inComprehending on P11. Then let some students tell me their answers.Step 4.Discussion :Let the students work in groups of four and discuss the strength and weakness of the two restaurants. Then fill in the chart.Step 5.Revision :Let the students to complete the summary of the story with one word in each blank.HEALTHY EATINGWang Pengwei felt 1_________ in an empty restaurant because no 2_______ have come to his restaurant ever since he got up early in the morning. He wanted to find out why. He hurried out and 3_______ Maochang into a newly-opened restaurant. He found that the owner named Yong Hui was serving 4_________ foods to make people thin. Driven by 5________, Wang Pengwei came 6________to take a close look at the menu. He could not even 7________his eyes. He was 8_______ at what he saw. He hurried outside and went to the 9________to do some 10________. After a lot of reading, he 11_______that Yong Hui’s food made peop le become 12______ quickly because it was no 13_________ food. Arriving home Wang Pengwei rewrote his own sign. The 14_________ between the two restaurants was on!(Key:1. frustrated 2. customers 3. followed 4. slimming/fiber 5. curiosity 6. forward 7. believe 8. amazed 9. library 10. research11. realized 12. tired 13. energy-giving 14. competition)Step 6.Homework :Writing: Make a survey on your partner’s diet and consider whether his/her diet is healthy or not. Write a short description of his/her diet and give some advice on that diet.。
人教版高二年级英语必修三教案

人教版高二年级英语必修三教案【导语】高二年级有两大特点:一、教学进度快。
一年要完成二年的课程。
二、高一的新鲜过了,距离高考尚远,最容易玩的疯、走的远的时候。
导致:心理上的迷茫期,学业上进的缓慢期,自我束缚的疏松期,易误入歧路,大浪淘沙的挑选期。
因此,直面高二的挑战,认清高二,认清高二的自己,认清高二的任务,显中意义十分重大而迫切。
作者高二频道为你整理了《人教版高二年级英语必修三教案》,期望对你的学习有所帮助!【教案一】教学准备教学目标Teaching AimsKnowledge a nd Skills:1. Ge t to know about Canada.2.Grasp some reading skills.3.Stimulate the Ss’ interest and love for learning about foreign countries.Strategy and Method:1.Train the students’fast-reading ability.2.Train the students’ ability to co operate with others.教学重难点Main points :1. Introduce the information of Canada to the students.2.Train the students’reading ability —skimming,and listening abilityDifficult point :Learn different reading skil ls for different reading purposes.Teaching procedures and ways教学进程Step1. Readin g&Greeting (2`)Step2. Leading in and Warming Up (5`)1.Free talk: Do you like to go sightseeing?Which country do you like to visit?What can you see in these countries?2.QuizStep3. Fast- reading (10`)1.what is“the true north”?It refers to “the cross-Canada train.”2.Draw the route of the two girls’ traveling across CanadaStep4. Careful- reading(T&F) (15`)Step5. Consoli dation (7`)Listening & SummaryFill in the blank and retell the story课后习题HomeworkSurf the Internet to find more information about CanadaChalkboard DesigningUnit5Canada –the “the true north”-----A thip “ on the true north”Vancouver Rocky Mountains Thunder BayCalgary Lake Superior Toronto【教案二】教学准备教学目标1. 教学目标(1)知识目标:学生能掌控下列重点单词和短语的意义和用法:greet, represent, approach, expression, defend, misunderstand, adult, cheek, major, likely, in general。
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Unit 2Healthy eating单元要览类别课程标准要求掌握的项目话题Problems with diet; balanced diet and nutrition词汇diet n. 日常饮食vi. 节食raw adj. 生的; 未加工的nut n. 坚果; 果仁vinegar n. 醋bean n. 豆; 豆科植物lie n. 谎话; 谎言vi.说谎pea n. 豌豆customer n. 顾客; 消费者cucumber n. 黄瓜discount n. 折扣eggplant n. 茄子weakness n. 缺点; 虚弱; 弱点pepper n. 辣椒; 辣椒粉strength n. 强项; 长处; 力量mushroom n. 蘑菇consult vt. 咨询; 请教; 商量peach n. 桃子fibre n. 纤维; 纤维制品lemon n. 柠檬digest vt. & vi消化n.摘要; 概要balance vt. 平衡; 权衡n. 天平;平衡carrot n. 胡萝卜barbecue n. 烧烤; 烤肉debt n. 债; 债务mutton n. 羊肉bacon n. 熏咸肉; 腊肉roast adj. 烤制的vt. 烤; 烘; 烘烤poisonous adj. 有毒的fry vt. & vi. 油煎; 油炸limit vt. 限制; 限定n.界限; 限度ought v. aux. 应当; 应该limited adj. 有限的glare vi. 怒目而视; 闪耀n. 怒视; 炫目的光benefit n. 利益; 好处vt.& vi有益于; 有助于; 受益slim vi. 变瘦adj. 苗条的; 纤细的breast n. 胸部; 乳房curiosity n. 好奇心garlic n. 大蒜hostess n. 女主人; 女主持人sigh vi. 叹息n. 叹息; 叹息声spy vt. & vi窥视; 秘密监视n.间谍; 侦探combine vt. & vi. (使)联合; (使)结合短语balanced diet平衡膳食in debt欠债ought to应该; 应当spy on暗中监视; 侦查lose weight体重减轻; 减肥cut down削减; 删节get away with被放过; (做坏事)不受惩罚before long不久以后tell a lie说谎put on weight增加体重win. . . back赢回; 重新获得be amazed at对……感到吃惊earn one’s living谋生compete with与……竞争重要句型1. Wang Peng sat in his empty restaurant feeling very frustrated. (present participle used as adverbial)2. By now his restaurant ought to be full of people. (ought to)3. Nothing could have been better. (could have done)4. Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did. (must have done)5. He could not have Yong Hui getting away with telling people lies! (can’t/couldn’t have sb. doing)功能 1. Suggestions and adviceWhat should we do? Shall we. . . ? How about. . . ?You must/mustn’t. . . . I think you ought to. . . . Perhaps you should. . . .You’d better. . . . You need/needn’t. . . . You have to/don’t have to. . . .My advice is/would be. . . . You might. . . . I suggest that you. . . .I would strongly advise you to. . . . It might be a good idea to. . . .2. Seeing the doctorWhat’s the matter? What’s wrong with you?What seems to be the trouble? How long have you been like this?It’s nothing serious, only. . . . I suppose you had better. . . .I think you ought to. . . .3. Agreement and disagreementI’m not sure that! You could be right, but. . . .(I’m afraid)I don’t agree. I agree up to a point, but. . . .That’s an in teresting idea, but. . . . Do you really think. . . ?Rubbish! /Nonsense! You can’t be serious!Actually/As a matter of fact, I think. . . . That’s not how I see it.语法Modal verbs: ought to/ought not tohave to/don’t have to/mustn’t/needn’t教学重点1. Get students to know about problems with a diet, a balanced diet and nutrition.2. Have students learn useful new words and expressions in this unit.3. Enable students to grasp and use the expressions of giving suggestions and advice.4. Let students learn the new grammar item: the use of ought to.5. Develop students’ listening, speaking, reading and writing abilities.6. Have students learn how to deal with and solve problems correctly.教学难点1. Enable students to master the use of ought to.2. Have students learn how to give suggestions and advice.3. Let students learn to write a short passage to make an advertisement.4. Develop students’ integrative skills.课时安排Periods needed: 7Period 1 Warming up and readingPeriod 2 Learning about language: Important language points Period 3 Learning about language: GrammarPeriod 4 Using language: Listening and speakingPeriod 5 Using language: Extensive readingPeriod 6 Using language: Speaking and writingPeriod 7 Revision: Summing up and learning tipPeriod 1Warming up and reading教学重点1. Let students learn more about problems with a diet, a balanced diet and nutrition.2. Get students to learn different reading skills.教学难点1. Develop students’ reading ability.2. Enable students to talk about different kinds of food and balanced diet.三维目标知识目标1. Get students to learn the useful new words and expressions in this part: diet, nut, bean, pea, cucumber, eggplant, pepper, mushroom, peach, lemon, balance, barbecue, mutton, roast, fry, ought, bacon, slim, curiosity, hostess, raw, vinegar, lie, customer, discount, balanced diet, ought to, lose weight, get away with, tell a lie, win. . . back.2. Let students learn the knowledge of balanced diet and nutrition.能力目标1. Develop students’ reading ability and let them le arn different reading skills.2. Enable students to talk about different kinds of food, problems with diet and balanced diet.情感目标1. Stimulate students’ sense to form a healthy eating habit.2. Develop students’ sense of cooperative learning.教学过程设计方案(一)→Step 1 Leading-inHave a free talk with students. Ask them the following questions:1. Everybody has to eat, but do you eat a healthy diet?2. What do you usually have for breakfast/lunch/supper?3. What kind of food do you like best?4. Why are you so strong/weak/fat/thin? Does it have anything to do with your diet?5. Do you think you are eating a balanced diet?→Step 2 Warming up1. Let students turn to Page 9. Ask them to look at the pictures, name the foods in them and then fill in the form.Healthy food Unhealthy food2. Show the following on the screen. Let students read the question and the information about food in the form below.Do you know that the food you eat helps you grow in different ways?Food that provides energy(e. g. energy-giving food) Food that helps growbones and muscles(e.g. body-buildingfood)Food that helps the body fightdiseases(e. g. protective food)rice noodles spaghetti bread potatoes chocolate butter cream oils nuts meat eggs cheesemilktofuMost vegetables(e. g. beans, peas,cucumbers, eggplants, peppers,mushrooms, cabbages)and fruit(e. g.apples, peaches, oranges, lemons)3. Ask students to work in pairs to discuss the following questions and then one of them tells their ideas to the class.Questions:1)Which groups of food do you like best?2)Which do you eat most often?3)Do you eat the three kinds of food each day?3)What will happen to you i f you don’t eat a balanced diet?→Step 3 Pre-reading1. Let students discuss the following question:What do you think should go into a good meal?2. Ask students to imagine they are going to invite some friends for dinner. Let them discuss the question: What special food of your place would you offer them? Then have them plan a menu.3. Let students turn to Page 10, look at the title of the reading passage and the pictures and predict what the passage is about. Then have them read the passage quickly to see if they are right.→Step 4 Read ing1. Fast readingAsk students to skim the reading passage and then answer the following questions:1)Who are mentioned in the story?2)Where did the story happen?Three minutes later, check the answers with the whole class.Suggested answers:1)Wang Peng, Yong Hui and Li Chang.2)It happened in the two restaurants: Wang Peng’s restaurant and Yong Hui’s restaurant.2. Intensive readingAllow students to read the passage carefully this time to understand the main idea of each paragraph and the important details, and then finish the following:1)Choose the best answer to each question according to the text.(1)What did Wang Peng think of the food in his restaurant?A. Very bad.B. Just so-so.C. Unpopular.D. Popular.(2)What did Wang Peng do after he saw his friend Li Chang hurrying by?A. He just sat in his restaurant felling frustrated.B. He did some research.C. He followed Li Chang to see why he didn’t eat with him.D. He began to advertise his food.(3)Which of the following was not mentioned on Yong H ui’s menu?A. Apples.B. Cola.C. Water.D. Cabbages.(4)Which of the following did Wang Peng not do to win his customers back?A. He improved his food.B. He advertised his food.C. He did some research.D. He found the shortcomings of Yong Hui’s food.Suggested answers: (1)D(2)C(3)B(4)A2)Use the information from the reading passage to tick out the correct statements and give reasons for your answers.(1)Usually Wang Peng’s restaurant was full of people.(2)Yong Hui could make people thin in two weeks by giving them a good diet.(3)Wang Peng’s regular customers often become fat.(4)Yong Hui’s menu gave customers more energy-giving food.(5)Wang Peng’s menu gave customers more protective food.(6)Wang Peng decided to compete with Yong Hui by copying her menu.3)The passage can be divided into 3 parts. Give the main idea in each part.Part Main ideaPart 1Part 2Part 33. Reading and discussionRead the passage a third time and then work in pairs to do the following:1)Write out your answers.(1)The weakness of the di et in Wang Peng’s restaurant was that it did not give ______________.(2)The strength of the diet in Wang Peng’s restaurant was that it provided ______________.(3)The weakness of the diet in Yong Hui’s restaurant was that it did not give ______________.(4)The strength of the diet in Yong Hui’s restaurant was that it provided______________.2)Discuss these questions. Write down your main points and compare them with those of another pair.(1)What do you think Wang Peng will provide to win his customers back?(2)How do you think the story will end?(Let students have enough time to read the passage carefully and discuss the questions with their partners. Encourage them to expand their answers according to their own experiences. )4. ExplanationHelp students analyze some difficult, long and complex sentences and guess the meanings of some new words. Encourage them to try to deal with the language points in the context.Discuss and explain in your own words the following important sentences or parts of sentences taken from the passage.1)Wang Peng sat in his empty restaurant feeling very frustrated.2)Nothing could have been better.3)Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did.4)He could not have Yong Hui getting away with telling people lies!5)Perhaps with a discount and a new sign he could win his customers back.5. Reading aloud and underliningAsk students to read the passage aloud to the tape and let them pay attention to the pronunciation of each new word and the pauses within each sentence. Tell them to pick out all the useful expressions or collocations from the passage while reading and copy them to the notebook after class as homework.Collocations: sit in his empty restaurant, feel very frustrated, a very strange morning, prepare his menu, by lunchtime, by now, ought to, be full of, be made of, Nothing could be better. , hurry by, follow sb. into. . . , lose weight, be fit, be amazed at, more than, a good meal, get away with, had better, do some research, too much, even though, energy-giving food, feel more hopeful, win. . . back, be on →Step 5 ConsolidationAsk students to talk about the problems with the diet in Wang Peng’s restaurant and Yong Hui’s restaurant in their own words accordi ng to the text. Then let them retell the whole story.→Step 6 Homework1. Learn the useful new words and expressions in this part by heart.2. Read the reading passage again and try to retell the story.设计方案(二)→Step 1 Leading in the topic1. Learning some vocabulary connected with food and diet.2. Identifying different groups of food.→Step 2 Warming up by making a surveyLet students interview their teachers and classmates on their diet and fill in the table.Name Breakfast Lunch Supper Favoritefood The reason for beingstrong/weak/fat/thin→Step 3 Predicting by looking and discussing1. Look at the pictures and title of the reading passage and discuss in pairs what the passage might be about.2. Two or three students will give their opinions.3. Let them read the passage quickly to see if they are right.→Step 4 Reading1. Give students 2 minutes, and ask them to skim the passage for the general idea of the passage.2. Give students 5 minutes to read the passage carefully, and answer the following questions.1)What makes a balanced diet?2)What is wrong with the diet of both Wang Peng and Yong Hui?3)Why does it matter if you only eat at Wang Peng’s or Yong Hui’s restaurant?3. Give students 4 minutes to read the passage a third time. Encourage them to try to deal with the language points in the context. Then let them answer the following questions.1)What does the word “frustrated” mean in Paragraph 1?2)How do you understand the sentence “Nothing could have been better”?3)What does the phrase “get away with” mean?4. Listening and reading aloudPlay the tape of the text for students and let them pay attention to the pronunciation of each new word and the pauses within each sentence. Then ask them to read the text aloud to the tape.→Step 5 DiscussionAsk students to work in pairs to discuss and compare the two restaurants. Try to find out the strength and weakness of each to fill in the chart.Wang Peng’s restaurant Yong Hui’s restaurant StrengthWeakness→Step 6 ExtensionLet students think about and discuss the following questions.1)What do you think will happen to Wang Peng’s restaurant?2)In your opinion, what kind of food should we eat?3)Can you make a balanced diet for yourself?→Step 7 Closing down by retelling the st ory1. Have students get prepared in 3 minutes or so and then ask them to retell thestory.2. Ask as many students as possible to have a try in front of the class.→Step 8 Homework1. Go over the text and try to learn all the useful words and expressions in this part by heart.2. Finish the exercises in Comprehending on Page 11.板书设计Unit 2Healthy eatingCome and eat here(1)True or false Key sentences1. Usually Wang Peng’s restaurant was full of people.2. Yong Hui could make people thin in two weeks by giving them a good diet.3. Wang Peng’s regular customers often become fat.4. Yong Hui’s menu gave customers more energy-giving food.5. Wang Peng’s menu gave customers more protective food.6. Wang Peng decided to compete with Yong Hui by copying her menu.1. Wang Peng sat in his empty restaurant feeling very frustrated.2. Nothing could have been better.3. Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did.4. He could not have Yong Hui getting away with telling people lies!5. Perhaps with a discount and a new sign he could win his customers back.活动与探究As we know from the story, Wang Peng wants to know what’s the matter with his menu and he wonder what he should do to satisfy the demand of the customers who enjoy the taste and also want to keep fit. Suppose you are an expert who knows nutrition very well. Write a research report for Wang Peng to give him some suggestions and advice on diet and make a balanced menu for his restaurant.Period 2Learning about language: Important language points 教学重点1. Enable students to grasp the usages of such important new words and expressions as diet, balance, consult, limit, benefit, combine, ought to, get away with, before long, etc.2. Get students to mas ter the patterns “Wang Peng sat in his empty restaurant feeling very frustrated. ” and “He could not have Yong Hui getting away with telling people lies! ”教学难点1. Let students learn the usage of the expression “ought to”.2. Enable students to learn the s entence pattern “He could not have Yong Hui getting away with telling people lies! ”3. Get students to understand some difficult and long sentences.三维目标知识目标1. Get students to learn and grasp the important useful new words and expressions in this part: diet, nut, bean, pea, cucumber, eggplant, pepper, mushroom, peach, lemon, balance, barbecue, mutton, roast, fry, ought, bacon, slim, curiosity, hostess, raw, vinegar, lie, customer, discount, weakness, strength, balanced diet, ought to, lose weight, get away with, tell a lie, win. . . back2. Let students learn the following important useful sentence patterns:1)Wang Peng sat in his empty restaurant feeling very frustrated. (present participle used as adverbial)2)By now his restaurant ought to be full of people. (ought to)3)Nothing could be better. (comparative degree used in negative)4)Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did. (must have done)5)He could not have Yong Hui getting away with telling people lies! (can’t/couldn’t have sb. doing. . . )能力目标1. Get students to use some useful new words and expressions correctly.2. Enable students to make sentences after the useful sentence patterns.情感目标1. Stimulate students’ interest in learning English.2. Develop students’ spirit of cooperation and t eamwork.教学过程设计方案(一)→Step 1 Revision1. Check the homework exercises.2. Ask some students to talk about problems with diet, balanced diet and nutrition.→Step 2 Reading and findingGet students to read through Warming Up, Pre-reading, Reading and Comprehending to underline all the new words and useful expressions or collocations in these parts.Collocations: have to, a healthy diet, in different ways, energy-giving food, body-building food, protective food, a balanced diet, sit in his empty restaurant, feel very frustrated, a very strange morning, prepare his menu, by lunchtime, by now, ought to, be full of, be made of, Nothing could be better. , hurry by, follow sb. into. . . , lose weight, be fit, be amazed at, more than, a good meal, get away with, had better, do some research, too much, even though, energy-giving food, feel more hopeful, win. . . back, be onRead them aloud and copy them down in the exercise book after class.→Step 3 Practice for useful words and expressions1. Turn to Page 12. Go through the exercises in Discovering useful words and expressions with students and make sure they know what to do.2. Give them several minutes to finish the exercises. They first do them individually, then discuss and check them with their partner.3. Check the answers with the whole class and explain the problems they meet where necessary.→Step 4 Studying important language points1. Everybody has to eat, but do you eat a healthy diet?每个人都得吃东西, 不过你的饮食健康吗?diet1)n. sort of food that is usually eaten(by a person, community, etc. )(某人、共同生活的人等)通常吃的食物; 日常饮食limited variety or amount of food that a person is allowed to eat限定的食物种类或数量; 限定食谱Too rich a diet is not good for you.吃太多油腻的食物对你身体不好。