Phrasesofunit5
1.正是这个人theveryperson
2.吃午饭/早饭菜havelunch/breakfast
3.什锦烤排themixedgrill
4.这个故事在我们听起来很有趣.Thestorysoundsinterestingtous.
5.按月付钱bepaidmonthly/bythemonth
6.影响某人做某事influencesomebodytodo
7.被(受到)…影响beinfluencedby
8.对…有很大/没有影响have(great/no)influenceon/uponsb/sth
9.在…的影响下undertheinfluenceof
10.某人花时间/钱做某事sbspendtime/money(in)doingsth/onsth
sbpaymoney(forsth)/sthcostsb…money/Ittakessb…timetodosth
11.充满,挤满wascrowdedwith
12.一大群人abigcrowd
13.反而,代替insteadof
14.谓语用复数的集合名词people,cattle,thepolice
15.胃口好/不好haveagood/healthy/bad/poorappetite
16.刺激某人的食欲stimulateone’sappetite
17.失去…的胃口loseone’sappetiteforsth.
18.含有维生素和矿物质containvitaminsandminerals
19.顺便问一下bytheway
20.这样养的动物animalskept(in)thisway
21.改变话题changethesubject
22.即不。。。也不。。。neither…nor…
23.有关饮食和健康的文章thearticleondietandhealth
24.能量来源thesourceofenergy
25.多种多样的食物avarietyoffood
26.以这种方式饲养的动物animalskeptthisway
27.一个精力充沛的人amanfullofenergy/anenergeticperson
28.你对北京的印象如何What’syouropinionofBeijing?
29.依某人的看法inone’sopinion/intheopinionofsb
30.对…评价好/高/不好haveagood/high/low/bad…opinionofsb
31.由于种种原因forvariousreasons
32.国与国文化不同Culturevariesfromcountrytocountry.
33.advisesth建议某事
34.advisesbtodosth建议某人做某事
35.advise(one’s)doingsth建议做某事
36.advisethat–cl(should)dosth建议做某事
37.advisesbonsth/想某人提供有关…的建议
38.advisesb+疑问词+todosth
39.advisesbagainststh建议某人不要做某事
40.一条建议apieceofadvice
41.接受某人的意见;听从某人的劝告accept/take/followonesadvice
42.全麦面包wholewheatbread
43.作为整体asawhole
44.总的来说onthewhole
45.告诫某人别做某事warnsb(not)todosth/warnsbofsth/warnsbagainst(doing)sth/warnsbthat-cl
46.非常疲劳muchtootired
47.太多的食物toomuchfood
48.随着…的增长withtheincreaseof
49.冒险做某事run/takethe/ariskofdoingsth;risksth/doingsth;attherisk(ofsth/doingsth
50.满足某人(对…的)需要fill/satisfy/meet/suitone’sneeds(forsth)
51.(对某人来说)(没)有必要做某事Thereisno/aneed(forsb)todosth
52.需要。。。inneedofsth
53.就…做出决定,决定要…,选择…decideon/uponsth
54.做出决定make/cometo/arriveat/reachadecision
55.tellAfromB区分/辨别
56.tell…apart区分;分清
57.tellthedifferencebetween(…and…)
一名优秀的教师在教学方面无论做什么事都有计划和准备,作为教师就要在上课前做好适合自己的教案。教案可以让学生们能够在上课时充分理解所教内容,让教师能够快速的解决各种教学问题。那么如何写好我们的教案呢?以下是小编为大家收集的“对数(1)教案苏教版必修1”欢迎大家阅读,希望对大家有所帮助。
3.2.1对数(1)
教学目标:
1.理解对数的概念;
2.能够进行对数式与指数式的互化;
3.会根据对数的概念求一些特殊的对数式的值.
教学重点:
对数的概念,对数式与指数式的相互转化,并求一些特殊的对数式的值;
教学难点:
对数概念的引入与理解.
教学过程:
一、情境创设
假设2005年我国的国民生产总值为a亿元,如每年平均增长8%,那么经过多少年,国民生产总值是2005年的2倍?
根据题目列出方程:______________________.
提问:此方程的特征是什么?已知底数和幂,求指数!
情境问题:已知底数和指数求幂,通常用乘方运算;而已知指数和幂,则通常用开方运算或分数指数幂运算,已知底数和幂,如何求指数呢?
二、数学建构
1.对数的定义.
一般地,如果a(a>0,a≠1)的b次幂等于N,即ab=N,那么就称b是以a为底N的对数,记作logaN,即b=logaN.
其中,a叫作对数的底数,N叫做对数的真数.
2.对数的性质:
(1)真数N>0,零和负数没有对数;
(2)loga1=0(a>0,a≠1);
(3)logaa=1(a>0,a≠1);
(4)a=N(a>0,a≠1).
3.两个重要对数:
(1)常用对数(commonlogarithm):以10为底的对数lgN.
(2)自然对数(naturallogarithm):以无理数为底的对数lnN.
三、数学应用
例1将下列指数式改写成对数式.
(1)24=16;(2);(3);(4).
例2求下列各式的值.
(1)log264;(2)log832.
基础练习:
log10100=;log255=;
log2=;log4=;
log33=;logaa=;
log31=;loga1=.
例3将下列对数式改写成指数式
(1)log5125=3;(2)log3=-2;(3)lga=-1.699.
例4已知loga2=m,loga3=n,求a2mn的值.
练习:
1.(1)lg(lg10)=;(2)lg(lne)=;
(3)log6[log4(log381)]=;(4)log3=1,则x=________.
2.把logx=z改写成指数式是.
3.求2的值.
4.设,则满足的x值为_______.
5.设x=log23,求.
四、小结
1.对数的定义:b=logaNab=N.
2.对数的运算:用指数运算进行对数运算.
3.对数恒等式.
4.对数的意义:对数表示一种运算,也表示一种结果.
五、作业
课本P79习题3.2(1)1,2,3(1)~(4).
一位优秀的教师不打无准备之仗,会提前做好准备,高中教师要准备好教案,这是教师工作中的一部分。教案可以保证学生们在上课时能够更好的听课,有效的提高课堂的教学效率。优秀有创意的高中教案要怎样写呢?小编收集并整理了“unit1lesson1aperfectdaylesson1教案(北师大版必修1)”,仅供参考,大家一起来看看吧。
unit1lesson1aperfectdaylesson1教案(北师大版必修1)古人云,工欲善其事,必先利其器。准备好一份优秀的教案往往是必不可少的。教案可以让学生能够听懂教师所讲的内容,帮助授课经验少的高中教师教学。高中教案的内容要写些什么更好呢?下面是小编为大家整理的“Festivals教案1”,仅供参考,欢迎大家阅读。
Unit14Festivals
-----ReadingKwanzaa
Teachingaims:
1.Learnandmastersomeimportantsentencepatterns
2.Trainthestudents’readingability.
3.Letthestudentslearnabouttherelationbetweenfestivalsandhistoryandculture.
Teachingimportantpoints:
1.Improvethestudents’readingability.
2.Helpthestudentslearnaboutforeignhistoryandculture.
Teachingdifficultpoints:
Howtohelpthestudentsunderstandthepassageexactly.
Teachingmethods:
1.Fastreadingandcarefulreadingtounderstandthepassagecorrectly.
2.Pairorgroupworktomakethestudentstakeanactivepartintheactivitiesinclass.
Teachingaids:
Ataperecorderandaprojector
Teachingprocedures:
一、Pre—reading
T:Everyone,pleasebrainstormasmanyfestivalsaspossibleathomeorabroad.
S:Christmas,newyear,aprilfool’sday…
T:Good.nowpleaselookatthepicturesanddescribewhatkindoffestivalitis.
S:Holloween,EasterandChristmas.
T:OK.Todaywe’regoingtolearnatextaboutakindoffestivalwhichsomeofyoumayhaven’theardof.It’sthefestivalcalledKwanzaa.
WhatdoyouknowaboutKwanzaa?Nowpleaselookatthescreen.First,let’sseesomesymbalsofthisfestival.canyouimaginewhatarethesethingsstandfor?
S:Ithinkthefruitsandcornsstandfortheharvest.
T:Verygood.Doyouknowwhattheearsofthecornstandfor?
S:Wedon’tknow.
T:Theearsofthecornstandforthesonsinthefamily.Thenumberofthesonsinthefamilydeterminesthequalityoftheearsofthecorn.
二、Reading
T:OK.Nowpleaselistentothetape,readthetextbyyourselvesandthenanswerthefollowingqueations.
1.Whenwasthefestivalbornandcelebrated?
2.Whocelebratesthefestival?
3.Whyisthefestivalcelebrated?
4.Howisthefestivalcelebrated?
5.What’sthesevenprinciplesofthefestival?
S:(Listenandreadthetextandfinallyanswerthequestions.)
三、Post--reading
T:Goodnowpleasereadthetext,findoutthedetailedinformationandthendotheexerciseoftrueorfalseinpost—reading.Ifitisfalse,pleasecorrectit.
S:(Dotheexerciseandthenanswerthequestions.)
四、Discussion
T:Nowyou’veknownKwanzaawell.PleasecompareKwanzaawiththeChineseSpringFestivalandChristmas.Inwhichwayaretheysimilarandinwhichwayaretheydifferent?
S:Discusswiththeirpartnersandthenseveralgroupsareaskedtoreporttheirresultsinfrontoftheclass.
五、Homework:
T:todaywe’velearntatextaboutanewkindoffestival.Afterclass,pleasereadthetextformoretimesandtrytoretellthetext.AndpleasewritedownyourdiscussionaboutdifferencesandsimilaritiesbetweenKwanzaaandNewYearaswellasChristmas.
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