【作业手册PPT】课时作业(二十一)

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部编(统编)人教版四年级下语文课时作业本 PPT课件 PPT课件

到了。
_儿__童___急__走__追__黄___蝶__，__飞__入__菜___花__无__处__寻___。________________________________
3. 最令人喜爱的顽皮的小儿子，他正横卧在溪头草丛，剥着刚摘下的莲蓬。
_最__喜___小__儿__亡__赖___，__溪__头__卧__剥___莲__蓬__。_____________________________________
作业2
一、根据课文内容填空。辛弃疾，字___幼__安___，号____稼__轩__，我国_____南__宋_时期著名的爱国词人。
课题中词牌名是______清__平__乐____，题目是______村__居__。我还知道的词牌名有： __示__例__：__菩___萨__蛮__、______江__城__子____、_______蝶__恋___花___等。
2. 在括号里填上恰当的词语。
( 金黄 )的梅子 ( 肥大)的杏子 ( 雪白)的麦花 ( 稀)疏的菜花
3. 有人评价本诗的前两句“有花有果，有色有形”，其中_____麦__花_、______菜__花是花； ________、梅_子_______是杏果子；__________、金_黄_________写雪色白；__________、__肥______写形。稀
人教版四年级下册
第一单元
一、静心练字。
1 古诗词三首
作业1
二、读一读，用“√”选出加点字的正确读音。
徐. 公(x√ú chú) 锄. 豆(zhù ch√ú) 三、看拼音，写词语。
篱落. (lí√lǐ) 蛱蝶. (jiā jiá)√
zhù sù
xī shū
qīng tíng
住宿

【作业手册PPT】课时作业(十七)

图K－17－6
[解析] 氢氧化钠中加入稀盐酸，溶液的pH由大于7，逐渐减小到7，盐酸过量时会小于7。
四、计算题 13.2017·聊城将40 g稀盐酸逐滴加入到20 g溶质质量分数为4% 的氢氧化钠溶液中，边滴加边搅拌。随着稀盐酸的滴加，溶液的pH变化如图K－17－7中甲所示，溶液的温度变化如图乙所示（不考虑反应过程中热量损失）。试回答：
图K－17－7
（1）图乙从A到B过程中，溶液的pH逐渐减小（填“增大” 或“减小”）。
（2）图乙表示酸碱恰好完全反应的点是 B 。（3）计算稀盐酸中溶质的质量分数。
解：设 20 g 稀盐酸中溶质的质量为 x。
NaOH ＋ HCl===NaCl＋H2O
40
36.5
20 g×4% x
3460.5＝20
D.由b点到c点的变化过程中没有发生化学反应
图K－17－3
[解析]通过图示可知，c点时溶液的pH小于7，溶液显酸性；a点时溶液的 pH大于7，显碱性，此时氢氧化钾过量，所以此时溶液中含有的溶质是 K2SO4和KOH；由图示可知，开始时pH大于7，说明原溶液显碱性，所以是将硫酸滴加到氢氧化钾溶液中；由b点到c点的变化过程中，是恰好完全反应后继续滴加稀硫酸，变化过程中没有发生化学反应。
【作业手册PPT】课时作业(十七)
2020/9/7
第十单元酸和碱
课时作业（十七）
达标巩固直击中考
达标巩固
一、选择题
1.一些物质的pH范围如下，其中呈碱性的是（ D ）
A.柠檬汁（2～3）
B.橘子汁（3～4）
C.西瓜汁（5～6）
D.牙膏（8～9）
[解析]牙膏的pH大于7，显碱性。
2.在检验某溶液是否呈酸性时，下列物质不可选用的是（ B ）

四年级下册语文-21.太阳课后作业(B组)_北师大版 ppt课件

的像圆环、像拱~~桥~~~、~~像~~~火~~舌~~~、~~~像~ 篱笆……日珥的数目和面积与太阳活
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
动~~~周~~期~~~有~~关~~~，~~且随黑子相对数而变化，但变化幅度没有黑子那样大。色球层之外为日冕，它(延伸延伸)到数倍太阳半径处。日冕也
三、片段练笔。他了解哪些关于太阳的知识？请他向大家引见引见，200字左右。
例文：太阳的年龄约为46亿年，它还可以继续熄灭约 50亿年。中华民族的先民把本人的祖先炎帝尊为太阳神。太阳的质量相当于地球质量的33万多倍，体积大约是地球的130万倍，半径约为70万千米，是地球半径的109倍多。虽然如此，它在宇宙中也只是一颗普通的恒星。在广袤浩瀚的繁星世界里，太阳的亮度、大小和物质密度都处于中等程度。只是由于它离地球最近，所以从地球上看上去它是天空中最大最亮的天体。点拨：只需是关于太阳的知识即可，语句要照射，条理要清楚。
_②__太__阳__照__黄__光__，__明__日__风__雨__狂__。_______________ ____③__太__阳__正__午__现__一__现__，__以__后__三__天__不__见__面__。__________
_诗__句__：__①__大__漠__孤__烟__直__，__长__河__落__日__圆__。_________ ____②__白__日__依__山__尽__，__黄__河__入__海__流__。_______________
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
太阳~，~~地~~~球~~~上~ 的庄稼和树木才干发
芽，长叶，开花，结果；鸟、兽、

【作业手册PPT】课时作业(七 )

4.下列说法错误的是（ A ）
A.溶液都是由一种溶质和一种溶剂组成的
B.溶液里各部分的性质是相同的
C.只要条件不变，糖水里的糖不会分离出来
D.通常不指明溶剂的溶液是水溶液
[解析] 溶液中的溶质可以有多种。
二、填空题 5.分别指出下列各种溶液里的溶质和溶剂。
溶液碘酒硫酸铜溶液澄清石灰水稀盐酸
溶质
碘硫酸铜氢氧化钙氯化氢
溶剂
酒精水水水
6.请回忆“溶液”的知识，并回答下列问题。（1）溶液在生产和科研中具有广泛的用途，与人们的生活息息相关，联想生活中的实例，谈谈溶液的用途。（要求谈两点） ①_许__多__化_学__反__应_在__溶_液__中__进_行__，_可__以__加_快__反_应__的__速_率____________________； ②__农_业__上_无__土__栽_培__、_盐__水__选_种__(合__理__即_可__) __________________________。（2）有一杯食盐溶液，实验测得其上部密度为a g/cm3，下部为b g/cm3，则a与b的关系是a ＝（填“＞”“＜”或“＝”）b。
[解析] 均一、稳定的液体不一定都是溶液，如蒸馏水。溶液中可以同时存在两种溶质，如糖盐水中含有蔗糖和氯化钠两种溶质。气态物质也可以作为溶质，如二氧化碳气体。溶液可能有颜色，如硫酸铜溶液是蓝色的。
3.下列实验现象或结论的描述中错误的是（ A ）
AБайду номын сангаас碘易溶于水
B.高锰酸钾几乎不溶于汽油
C.糖水中各部分密度相同 D.乙醇能与水互溶
7.为了探究物质的溶解现象，同学们设计并进行了如下实验。实验
现象
固体溶解，形成紫红色溶液

2014届高考数学文一轮复习(浙江省专用)作业手册21简单的三角恒等变换(附详细解析)

课时作业(二十一) [第21讲简单的三角恒等变换](时间：45分钟分值：100分)基础热身1．cos75°cos15°－sin255°sin15°的值是( )A ．0 B.12C.32 D ．－122．已知cos ⎝⎛⎭⎫α－π4＝14，则sin2α的值为( ) A.3132 B ．－3132C ．－78 D.783．设－3π<α<－5π2，则化简1－cos （α－π）2的结果是( ) A ．sin α2 B ．cos α2C ．－cos α2D ．－sin α24．已知α，β为锐角，cos α＝45，tan(α－β)＝－13，则tan β的值为( ) A.13 B.139 C.1315 D.59能力提升5．[2012·陕西卷] 设向量a ＝(1，cos θ)与b ＝(－1，2cos θ)垂直，则cos2θ等于( )A.22B.12C ．0D ．－16．[2011·杭州二中仿真] 已知tan β＝43，sin(α＋β)＝513，其中α，β∈(0，π)，则sin α的值为( ) A.6365 B.3365C.1365D.6365或3365 7．[2012·北京四中期中] 若f (x )＝2tan x －2sin 2x 2－1sin x 2cos x 2，则f π12的值为( ) A ．4 3 B.833 C ．4 D ．88．[2012·台州中学模拟] 在△ABC 中，角A ，B ，C 所对的边分别为a ，b ，c ，满足：cos2A ＋52cos A ＝sin ⎝⎛⎭⎫π3＋B ·sin π3－B ＋sin 2B ，则A 等于( ) A.π6 B.π4 C.π3 D.π29．[2012·江西卷] 已知f (x )＝sin 2⎝⎛⎭⎫x ＋π4，若a ＝f (lg5)，b ＝f ⎝⎛⎭⎫lg 15，则( )A ．a ＋b ＝0B ．a －b ＝0C ．a ＋b ＝1D ．a －b ＝110．[2012·岳阳一中月考] 函数f (x )＝sin 22x －π4的最小正周期是________． 11．[2012·自贡诊断] 若f (x )是以4为周期的奇函数，f ⎝⎛⎭⎫12＝1，且sin α＝14，则f (4cos2α)＝________． 12．已知sin2α＋2sin 2α1＋tan α＝k ⎝⎛⎭⎫π4<α<π2，用k 表示sin α－cos α的值等于________． 13．[2012·哈尔滨一中期中] 若点P (cos α，sin α)在直线y ＝－2x 上，则sin2α＋2cos2α＝________．14．(10分)已知函数f (x )＝cos 2x －3sin x cos x ＋1.(1)求函数f (x )的单调递增区间；(2)若f (θ)＝56，θ∈⎝⎛⎭⎫π3，2π3，求sin2θ的值．15．(13分)[2013·浏阳一中月考] 已知函数f (x )＝2cos 2x 2－3sin x . (1)求函数f (x )的最小正周期和值域；(2)若α为第二象限角，且fα－π3＝13，求cos2α1＋cos2α－sin2α的值．难点突破16．(12分)[2013·山西大学附中月考] 已知A ，B ，C 为锐角△ABC 的三个内角，向量m ＝(2－2sin A ，cos A ＋sin A )，n ＝(1＋sin A ，cos A －sin A )，且m ⊥n .(1)求A 的大小；(2)求y ＝2sin 2B ＋cos 2π3－2B 取最大值时角B 的大小．课时作业(二十一)【基础热身】1．B [解析] 原式＝cos75°·cos15°＋sin75°sin15°＝cos(75°－15°)＝cos60°＝12. 2．C [解析] 方法一：sin2α＝cos ⎝⎛⎭⎫π2－2α＝2cos 2⎝⎛⎭⎫α－π4－1＝－78，故选C. 方法二：cos ⎝⎛⎭⎫α－π4＝22cos α＋22sin α＝14，两边平方得，12＋12sin2α＝116， ∴sin2α＝－78，故选C. 3．C [解析] ∵－3π<α<－52π，∴－32π<α2<－54π， ∴cos α2<0， ∴原式＝1＋cos α2＝⎪⎪⎪⎪cos α2＝－cos α2. 4．B [解析] ∵α是锐角，cos α＝45，故sin α＝35，tan α＝34， ∴tan β＝tan[α－(α－β)]＝tan α－tan （α－β）1＋tan αtan （α－β）＝139. 【能力提升】5．C [解析] 由向量垂直的充要条件可知，要使两向量垂直，则有－1＋2cos 2θ＝0，则cos2θ＝2cos 2θ－1＝0.故选C.6．A [解析] 根据α，β∈(0，π)，求出sin β＝45，cos β＝35，判断角的范围，求出cos(α＋β)＝－1213，所以sin α＝sin[(α＋β)－β]＝sin(α＋β)cos β－cos(α＋β)sin β＝6365. 7．D [解析] f (x )＝2tan x －2sin 2x 2－1sin x 2cos x 2＝2sin x cos x ＋1－2sin 2x 212sin x ＝2sin x cos x ＋2cos x sin x ＝2（sin 2x ＋cos 2x ）sin x cos x ＝4sin2x ，所以f π12＝4sin π6＝8. 8．C [解析] 化简原式可得8cos 2A ＋10cos A －7＝0，求得cos A ＝12，得A ＝π3. 9．C [解析] 函数f (x )＝sin 2⎝⎛⎭⎫x ＋π4＝12⎣⎡⎦⎤1－cos2⎝⎛⎭⎫x ＋π4＝12＋12sin2x ，∵f (lg5)＋f (－lg5)＝1＋12[sin(2lg5)＋sin(－2lg5)]＝1＋12[sin(2lg5)－sin(2lg5)]＝1，∴a ＋b ＝1.故选C. 10.π2 [解析] 对解析式进行降幂扩角，转化为f (x )＝－12cos4x －π2＋12，可知其最小正周期为π2. 11．－1 [解析] 由sin α＝14可得4cos2α＝4(1－2sin 2α)＝4⎣⎡⎦⎤1－2×⎝⎛⎭⎫142＝72，所以f (4cos2α)＝f ⎝⎛⎭⎫72＝f ⎝⎛⎭⎫－12＝－f ⎝⎛⎭⎫12＝－1. 12.1－k [解析] 由已知等式得2sin α（cos α＋sin α）cos αcos α＋sin αcos α＝k ，整理得2sin αcos α＝k . ∵π4<α<π2，∴sin α－cos α>0，得sin α－cos α＝1－2sin αcos α＝1－k . 13．－2 [解析] 由已知得sin α＝－2cos α，即tan α＝－2，所以sin2α＋2cos2α＝2sin αcos α＋2cos 2α－2sin 2α＝2sin αcos α＋2cos 2α－2sin 2αsin 2α＋cos 2α＝2tan α＋2－2tan 2αtan 2α＋1＝－2. 14．解：(1)f (x )＝cos 2x －3sin x cos x ＋1 ＝1＋cos2x 2－32sin2x ＋1＝cos ⎝⎛⎭⎫2x ＋π3＋32. 由2k π＋π≤2x ＋π3≤2k π＋2π(k ∈Z )，得k π＋π3≤x ≤k π＋5π6(k ∈Z )． ∴函数f (x )的单调递增区间是⎣⎡⎦⎤k π＋π3，k π＋5π6(k ∈Z )． (2)∵f (θ)＝56，∴cos ⎝⎛⎭⎫2θ＋π3＋32＝56， cos ⎝⎛⎭⎫2θ＋π3＝－23. ∵θ∈⎝⎛⎭⎫π3，2π3，∴2θ＋π3∈⎝⎛⎭⎫π，5π3， sin ⎝⎛⎭⎫2θ＋π3＝－1－cos 2⎝⎛⎭⎫2θ＋π3＝－53. ∴sin2θ＝sin ⎝⎛⎭⎫2θ＋π3－π3＝12sin ⎝⎛⎭⎫2θ＋π3－ 32cos ⎝⎛⎭⎫2θ＋π3＝23－56. 15．解：(1)∵f (x )＝1＋cos x －3sin x ＝1＋2cos x ＋π3， ∴函数f (x )的周期为2π，值域为[－1，3]．(2)∵fα－π3＝13，∴1＋2cos α＝13，即cos α＝－13. cos2α1＋cos2α－sin2α＝cos 2α－sin 2α2cos 2α－2sin αcos α＝（cos α＋sin α）（cos α－sin α）2cos α（cos α－sin α）＝cos α＋sin α2cos α. 又∵α为第二象限角，∴sin α＝223， ∴原式＝cos α＋sin α2cos α＝1－222. 【难点突破】16．解：(1)∵m ⊥n ，∴m ·n ＝(2－2sin A )(1＋sin A )＋(cos A ＋sin A )(cos A －sin A )＝0，即2(1－sin 2A )＝sin 2A －cos 2A ，∴2cos 2A＝1－2cos 2A ⇒cos 2A ＝14. ∵△ABC 是锐角三角形，∴cos A ＝12，得A ＝π3. (2)△ABC 是锐角三角形，且A ＝π3， ∴π3<B <π2. ∴y ＝2sin 2B ＋cos 2π3－2B ＝1－cos2B －12cos2B ＋32sin2B ＝32sin2B －32cos2B ＋1＝3sin2B －π3＋1. 当y 取最大值时，2B －π3＝π2，即B ＝512π.。

六年级上册语文作业讲析课件第21课别挤啦(A组)_北师大版 (共11张PPT)

3. 为什么说“思想的王国是自由的天地”？ ____因__为__思__想__所__想__的__东__西__广__泛__，__可__以__自__由__追__求__，__所__以__是__自__由__的__天_ 地。
4．你想对生活中“挤”的人说些什么？ ____我__们__要__以__宽__容__之__心__容__纳__别__人__，__不__要__斤__斤__计__较__；__我__们__要__以__善__良__之___
写句子) 不要把______谦__虚__从__心__中__挤__走__，更得严防_____骄__傲__在__心__底__滋__长___。
ห้องสมุดไป่ตู้
•9、要学生做的事，教职员躬亲共做；要学生学的知识，教职员躬亲共学；要学生守的规则，教职员躬亲共守。2021/8/252021/8/25Wednesday, August 25, 2021 •10、阅读一切好书如同和过去最杰出的人谈话。2021/8/252021/8/252021/8/258/25/2021 3:03:36 PM •11、只有让学生不把全部时间都用在学习上，而留下许多自由支配的时间，他才能顺利地学习……（这）是教育过程的逻辑。2021/8/252021/8/252021/8/25Aug-2125-Aug-21 •12、要记住，你不仅是教课的教师，也是学生的教育者，生活的导师和道德的引路人。2021/8/252021/8/252021/8/25Wednesday, August 25, 2021
我们应当自强自立。 C．这句话告诉我们，生活在同一个地球上，整个世界就
是一个大家庭，应该礼让、和平共处。
你，不要挤！世界那么大，它容纳得了我，也容纳得了你。
所有的大门都敞开着，思想的王国是自由的天地。

高考英语方案作业手册模块7 UnitHuman Biology

毛额市鹌鹑阳光实验学校课时作业(二十一) [模块7 Unit 21 Human Biology](限时：40分钟)Ⅰ.单项填空1．If we sit near ________ front of the bus, we'll have ________ better view.A．/; the B．/; aC．the; a D．the; the2．The new movie ________ to be one of the biggest moneymakers of all time.A．promises B．agreesC．pretends D．declines3．Do you agree or________ the plan? You have a say about this.A．oppose B．refuseC．object D．demand4．He didn't make________clear when and where the meeting would be held.A．these B．thisC．it D．that5．As time went on, those unpleasant events were gradually________ from his memory.A．wiped out B．stood outC．cleaned out D．put out6．If we________ other people's love and trust in us, we will be cast aside by others one day.A．hold B．takeC．abuse D．have7．Every classroom in this modern school is________ with a new TV set.A．equipped B．preparedC．fixed D．placed8．The passengers were robbed________all their money in broad daylight.A．of B．offC．from D．away9．In recent years travel companies have succeeded in selling us the idea that the further we go，________．A．our holiday will be betterB．our holiday will be the betterC．the better our holiday will beD．the better our holiday be10．________ thousands of people outside; it was too noisy.A．There seemed to beB．There seemed to haveC ．It seemed to beD ．It seemed to have Ⅱ.完形填空In a national spelling contest in America, an 11yearold girl wasasked to spell a certain word.But with her __11__ voice the judges were not sure if she spelled the word with the letter “a” or “e”. They talked it over and __12__ decided to simply ask her what she had said.By now, the girl knew she had __13__ the word.But instead of lying, she told the truth that she had said the __14__ letter —so she lost the contest.As the girl walked off the __15__ , the entire audience stood to their feet clapping to applaud her __16__. Later, dozens of newspaper reporters wrote about this 11yearold gi rl's honesty, even when it __17__ her the contest. But the fact is that she __18__ the biggest contest that day: the contest of her __19__．Probably the biggest test of our character is what we would do if we knew we would never get __20__. This young girl could easily have __21__ and nobody would have known it but herself. But that's just it: She would know she did wrong. It's been said, “If you __22__ , you make yourself cheap.” This young girl was strong and smart enough to prize her own __23__ and character rather than the prize from a spelling __24__. Her respect for herself was more important than any__25__ others might give her for winning a contest. She knew she would have to live with herself and the __26__ she made in that moment will have longlasting influence.It's so true that the choices you make today __27__ what you aretomorrow. Our children will __28__ our behaviour much more than our advice. So if we want them to __29__ to be honest, we must show them the way by being honest ourselves. Remember, our kids are __30__ what we do and how we live even when we don't think they see or know. 11．A.high B ．sweet C ．tough D ．soft12．A.finally B ．kindly C ．secretly D ．totally13．A.forgotten B ．mispronouncedC ．misspelledD ．lost14．A.correct B ．wrong C ．different D ．same 15．A.stage B ．studio C ．test D ．classroom16．A.bravery B ．honestyC ．courageD ．cleverness 17．A.cancelled B ．cost C ．offered D ．wasted18．A.achieved B．brokeC．won D．defeated19．A.reputation B．knowledge C．life D．character20．A.paid B．awarded C．caught D．reported21．A.escaped B．lied C．changed D．answered22．A.accept B．fight C．cheat D．insist23．A.conscience B．feeling C．diligence D．modesty24．A.contest B．champion C．judge D．expert25．A.sense B．pride C．respect D．awareness26．A.plan B．conclusion C．discovery D．choice27．A.make B．change C．keep D．create28．A.give B．takeC．follow D．set29．A.grow up B．bring upC．take up D．come up30．A.recording B．inspectingC．correcting D．watchingⅢ.阅读理解AThe poor are very wonderful people. One evening we went out and we picked up four people from the street. And one of them was in a most terrible condition－and I told the sisters: You take care of the other three. I take care of this one who looks worse. So I did for her all that my love can do. I put her in bed, and there was such a beautiful smile on her face. She took hold of my hand as she said just the words “Thank you” and she died.I could not help but examine my conscience before her and I asked what I would say if I was in her place. And my answer was very simple.I would have tried to draw a little attention to myself. I would have said I am hungry, I am dying, I am cold, I am in pain, or something, but she gave me much more－she gave me her grateful love. And she died with a smile on her face. So did that man whom we picked up from the drain, half eaten with worms, and we brought him to the home. “I have lived like an animal in the street, but I am going to die like an angel, loved and cared for”， he said at the end. And it was so wonderful to see thegreatness of that man who could speak like that, who could die like that without blaming anybody, without cursing anybody, without comparing anything. Like an angel－this is the greatness of our people. And that is why we believe what Jesus has said: I was hungry, I was naked, I was homeless, I was unwanted, unloved, uncared for, and you did it to me.And with this prize that I received as a Prize of Peace, I am going to try to make the home for many people who have no home. Because I believe that love begins at home and if we can create a home for the poor I think that more and more love will spread. And we will be able through this understanding love to bring peace, the good news to the poor, the poor in our own family first, in our country and in the world. When I pick up a person from the street, hungry and I give him a plate of rice or a piece of bread, I have satisfied. I have removed that hunger. But to a person who is shut out, who feels unwanted, unloved, terrified, who has been thrown out from society, that poverty is so full of hurt and so unbearable… And so let us always meet each other with a smile, for the smile is the beginning of love, and once we begin to love each other naturally we want to do something.31. What can be learned from the second paragraph?A．The woman should have paid more attention to herself.B．The man couldn't blame anyone.C．The author is religious.D．The man died in the street.32．The purpose of this passage is ________．A．to appeal for more donation for the poorB．to call on the public to love each otherC．to tell the readers the poor are wonderfulD．to express how moved the author is to receive the prize33．Which of the following can NOT be inferred from the passage?A．The author has few supporters.B．The author was somewhat surprised at what the man said.C. The author is delighted to help others in trouble.D．The author may agree to solve social problems in soft ways.34. What's the best title of this passage?A．Have Sympathy for the PoorB．The Poor are WonderfulC．Smile and LoveD．Relieve PovertyBInformation has always been at the center of human communication.You may ask why.Well，communication between people contains giving and receiving information.The way we give and receive information today has experienced a revolution in the development of the mass media in the 20th century.The first truly mass communication medium was the newspaper.For the first time in history people could read about events in their country and from around the world every day. However there were two problems with newspapers of that time.Firstly，newspapers were available only in large cities，for getting newspapers to the countryside was a difficult and timeconsuming(耗时的)task.Secondly, newspapers weren't always reliable, as there was a limited range of opinions.Nowadays，we can choose from a wide variety of sources to get information.Television and the Internet have given us the chance to be informed about everything the minute it rge numbers of radio and TV stations，satellite channels and millions of websites help people keep up with the latest news.People live in history and are part of it.The media have come a long way in the last century and there is no doubt that we now live in the information age. Whatever type of media we choose，it all comes down to the need for information.This will always be a basic need as long as communication is part of human nature.35．Information is considered the center of human communication because________．A．human communication means information exchangeB．human communication involves people's participationC．information is now experiencing a revolutionD．information helps people gather together36．What was the historical contribution of the newspaper as a source of information?A．It made the mass communication truly develop.B．It helped the mass communication develop in cities.C．It kept people timely informed about home and world events.D．It kept reliable information available in big cities.37．The third paragraph mainly tells us that technologyhelps________．A．make information easily availableB．people be part of historyC．inform everything timelyD．produce the latest news38．It can be concluded from the last paragraph that a basic need today is________．A．communicationB．informationC．high technologyD．media typesⅣ.短文改错Today I attended in the English Corner. It was the first time that an English Corner had held in our school. Many teachers, included some English teachers, went there. The Students' Union even invited Mr. Smith,a honored guest, to the English Corner. He introduces some western customs and also encouraged us student to learn to speak English freely. But when I had a chance to talk, I felt a bit nervously and was at a loss how to say. It took me some time to get used to speak fluent English.I was determined to take part in so wonderful activities as often as possible.参考答案课时作业(二十一)Ⅰ.1. C2. A 考查动词意义辨析。

【作业手册PPT】课时作业(十八)

图K－18－4
（1）打开止水夹后观察到的现象是 ___澄__清__石_灰__水_沿__导__管_进__入_左__侧__集_气__瓶__，_集__气_瓶__内__溶_液__变_浑__浊______________。（2）写出整个过程中发生反应的化学方程式： 2NaOH＋CO2===Na2CO3＋H2O，Na2CO3＋Ca(OH)2===CaCO3↓＋2NaOH 。
[解析]碳酸钠俗称纯碱，但它属于盐类物质；生石灰是氧化钙的俗称，但它与水反应生成的氢氧化钙具有腐蚀性，不能用作补钙剂；食盐的主要成分是NaCl，且食盐不与铁锈的主要成分氧化铁反应，不能用于除铁锈。
4.对盐的组成叙述正确的是（ D ）
A.都含有原子团
B.都含有金属元素
C.都不含氢元素
D.都含有非金属元素
四、计算题
15.某食用纯碱中含有少量的氯化钠，为测定该纯碱中碳酸钠（Na2CO3）的含量，现取纯碱样品12.5 g，加入150.0 g稀盐酸恰好完全反应，测得反应后溶液总质量为158.1 g。请计算：（1）反应中产生CO2的质量。（2）纯碱样品中Na2CO3的质量分数。
解：(1)生成 CO2 的质量为： 12．5 g＋150.0 g－158.1 g＝4.4 g。
5.某同学将维生素C泡腾片放入水中，观察到有大量气泡冒出，
根据泡腾片的主要成分分析，该气体主要是（ C ）
A.O2
B.N2
C.CO2
D.水蒸气
图K－18－1
[解析]泡腾片中含有碳酸氢钠和柠檬酸，所以将泡腾片放入水中后，碳酸氢钠和柠檬酸会反应生成二氧化碳气体。
6.下列关于Na2CO3和NaHCO3的说法错误的是（ B ） A.Na2CO3的水溶液显碱性 B.Na2CO3俗称纯碱，是碱类物质 C.NaHCO3可治疗胃酸过多 D.Na2CO3和NaHCO3都能与稀盐酸反应

语文七年级下册Word课时作业+教师配套课件21 伟大的悲剧茨威格

第六单元
21 伟大的悲剧/茨威格
夯实基础巩固知识阅读探究拓展延伸写作借鉴提升能力
-14-
11.“对人类来说,第一个到达者拥有一切,第二个到达者什么也不是。”这句话是作者的观点,还是斯科特的观点?为什么? 这是斯科特的观点。作者是站在斯科特的角度,表达了角逐失败后的一种极度沮丧、悲哀的心情,但事实上作者并不这么认为,这可从作者为斯科特这个“失败者”立传中可以看出。 12.既然知道阿蒙森团队先到达了极点,斯科特一行为什么还要继续他们的路? 他们怀着绝望的心情,却没有半途而废,明知结局是失败,但还是走完全程,体现了他们高尚的人格与绅士风度。 13.“斯科特接受了这项任务,他要忠实地去履行这一最冷酷无情的职责:在世界面前为另一个人完成的业绩做证,而这一事业正是他自己所热烈追求的。”这体现了斯科特什么样的精神品质? 诚实守信、坦然面对成功与失败的优质品质。
第六单元
21 伟大的悲剧/茨威格
夯实基础巩固知识阅读探究拓展延伸写作借鉴提升能力
-9-
8.班级准备开展以“我说探险”为主题的综合性学习活动,请你参与。 ( 1 )班级组织了关于支持还是反对探险的辩论赛,下面是反方的观点,假如你是正方辩手,请进行反驳。反方:我们反对探险。因为人类探险的足迹所到之时,也就是那里的灾难发生之日:人类飞向太空,如今地球的垃圾已环绕太空;人类登上“地球之巅”——珠穆朗玛峰,今天的长江之源已受到污染……如同哥伦布发现“新大陆”带来了殖民主义的扩张,当今人类无所限制的“探险”,也反映了人类中心主义的扩张。人类探险到哪里留下脚印,也就在哪里留下了灰尘。正方:我们支持探险。通过探险可以更好地开发地球资源。探索自然,拼搏进取,更是一种生命价值的体现。正是有了人类的探险,才有了如今万紫千红的世界。麦哲伦率船队远航,最终证明了地圆说。我们去探险是为了研究大自然,现代意义上的探险也是为了更好地保护环境,人类走的每一步都是不断探索的历史。

秋季课时作业本答案天下通PPT学习教案

第16页/共33页
2.1达标训练P20
选择A/B/C/ 分析说明题6、（1）没有正确认识
自己，自不量力，高估自己
（2）不明智。没有客观正确认识自己，用自己的弱势与别人的优势对比，明智的做法是提出进行一次跳高比赛。
7、（1）、他人评价。能跟客观地认识自己的不足第17页和/共3优3页势。
在危机面前，要冷静坦然积极面对而不是
惊慌失措；
第3页/共33页
简答题 1.2第一课时P7
6、热情开朗、乐于助人、积极上进。 7、（1）没有必要害怕。（2）积极主动结识同学，积极与同学打招
呼，将自己介绍给同学（3）尊重关心同学，积极参加班级的活动，
积极和同学老师交流；
第4页/共33页
简答题 1.2第一课时P7
2.2第二课时P23-24
单选择C/B/B/D/B
多选题BAC/AB/CD/BA/ACBD/
简答题6、(1)不对。不能调控情绪，易引发严重后果。
（2）要遵守比赛规则；出现意见分歧要沟通；应注
意调节控制自己的情绪；
7、（1）趾高气扬；垂头丧气；唉声叹气；
（2）没有。不利于身心健康；影响自己的学习生活和人际交往；不利于找到良好自我感觉；（课本P33）
（2）学会每天保持好心情；主动热情与身
边的人交往，敞开心扉；积极参加集体活
动；
第6页/共33页
简答题 1.2第二课时P8-9
5、6略。 7、（1）不真诚热情；喜欢斤斤计较；不善
于奉献；不够宽容；
（2）见课本P12 8、消除闭锁心理；培养热情开朗的性格；
热情坦然与人交往；
高分突破（略）第7页/共33页
劲往一处使，展现个性，就易成功。
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人教版2020年高考英语一线一轮复习练习：必修5-作业手册-教师详解

课时作业(二十一)Ⅰ.[文章大意] 本文介绍了屠呦呦因发现青蒿素，研制出治疗疟疾的重要药物而获得诺贝尔生理学或医学奖，从而使人们更加关注中药的价值。

1．B细节理解题。

根据文章第一段第一句“…the Nobel Prize in Physiology(生理学) or Medicine…”以及第一段最后一句“…the Lasker-DeBakey Clinical Medical Research Award.”可知，本文提及屠呦呦所获的两个奖项。

故选B项。

2．D词义猜测题。

根据文章第二段画线词所在句“…reduced death rates among patients suffering from malaria.”中的death rate以及patient可知，malaria应为一种让病人死亡的“疾病(disease)”。

故选D项。

3．C细节理解题。

根据文章最后一段第二、三句“屠呦呦的成功会引发人们对中医的认可与尊重，西方国家应该学习欣赏中医的价值”可知，A项中的Easterners(东方人)错误，C项“全世界应更多地对中医价值进行研究”符合原文，故选C项。

B项的nothing以及D 项的only太绝对，排除B、D两项。

4．B主旨大意题。

全文主要描述屠呦呦所发现的青蒿素(一种中医药)让其获得诺贝尔生理学或医学奖，主要原因在于这种传统中药可有效用于治疗疟疾，从而引发人们对中医价值的重视。

由此可知，B项“诺贝尔奖得主屠呦呦强烈支持中医研究”符合文章主旨。

故选B项。

Ⅱ.[文章大意] 本文主要介绍了青少年和父母相处的问题。

1．A年轻人常觉得与父母在一起会感到不自在，空白处所在段均是年轻人的种种想法，故主语应该是they开头，且从空白处的下句也可得到暗示。

故选A项。

2．D根据本段第三、四句可知，成年人更容易担心，他们大多数都提前计划事情。

而第一、二句说的是年轻人的做法，故D项(年轻人喜欢不思考太多就行动)符合语境。