二、非选择题（共5小题，共52分）17.(10分)氧族元素及其化合物种类繁多，应用广泛。(1)基态硫原子的价电子排布图为▲。(2)下列说法正确的是▲。A.O3在水中的溶解度比在CC14中小B.H2S的酸性弱于C2HSHC.氧族元素位于元素周期表中的s区D.热稳定性：H2Se>AsH3(3)许多物质的氧化物固态存在多聚体，例如五氧化二磷实际的分子式是P4O0,实验测得磷、硫、氯三种氧化物的熔点如下，推测固态三氧化硫的分子式为▲。P4O10三氧化硫Cl207熔点613K289K182K0(4)12-冠4)可与锂离子络合，其中氧的杂化方式Co●为(5)锂钴复合氧化物是目前商品化锂离子电池的常用正极材料，其理想结构如图。其化学式为▲。18.(10分)燃煤火电厂产生的尾气（主要成分为SO2、NO)可以按如下流程脱除或利用。0Cu+Cu(O2)NOCu'(NO2)C2H,Cu、N2、石灰乳C02、H0ICaSO:CaSOs02NOC02CaCO3-NaCIO2混合液ⅡCaSOCa(NO3)2请回答：(1)写出途径I中SO2转化成CaSO4的总反应化学方程式▲(2)下列说法正确的是▲A.途径I中Cu的作用是催化剂B.途径I中C2H4的作用是还原剂C.若用氨水代替石灰乳吸收尾气，则SO2可能最终转化成为NH4HSO4或NH4)2SO4D.工业制硝酸的第一步是N2与O2反应得到NO化学试卷第5页（共8页）

如何工作的。D篇主题语境：人与社会一一历史本文是说明文。文章主要介绍了巴拿马帽的历史及相关情况。32.C。理解具体信息。根据第一段中的President Theodore Roosevelt inspected theconstruction of the canal in a white suit topped off with one of the Ecuadorian hats to block thesun可知，罗斯福总统戴这顶帽子只是为了防晒。33.B。理解具体信息。根据第二段中的the pinta'o...is defined by complex dark patterns可知，pinta'o是由复杂的深色图案构成的。34.A。理解具体信息。根据第二段中的To form the hat,braids are wrapped around a woodenblock and carefully sewn together by hand可知，这个木块是起支撑作用的工具，把辫状物绕着木块围成帽子的形状，然后就可以缝制起来。35.D,推断。根据倒数第二段中的The daily use hat has up to ten turns...and the other is moredetailed with around 20 turns The more delicate version is prepared for special occasionsincluding weddings,birthdays and community celebrations可知，帽子上的圈数越多，表明所适用的场合越正式。第二节主题语境：人与自我一一学本文是说明文。文章主要介绍了提高学效率的几种方法。36.F。根据设空处后的Even more depressing is that.可知，此处应该是说令人沮丧的事情，F项内容（可惜的是，我直到15岁才遇到他！）符合此处语境。37.D。根据设空处后的You have to be engaged可知，作者建议在学的过程中要积极参与，而非只是人到了就行。D项中的just being there与设空处后的be engaged形成对照。38.B.根据本段中的Unfortunately,,just reading something一rather than actively memorisingit一may do more harm than good可知，仅靠朗读可能会适得其反，并不利于记忆，故用B项内容作为小标题最合适。39.G。根据本段小标题Don't check your memory too soon可知，作者建议不要太早检查你的记忆效果，言外之意就是先等一等，故G项内容（要等到回忆起来更有困难的时候）符合此处语境。40.C。根据本段小标题Learners don't need to be loners和设空处前的learn collaboratively可知，作者认为学的时候不要独自一人，最好找个搭档。C项中的in company与设空处前的collaboratively相互呼应。语言运用第一节主题语境：人与社会一一文学本文是记叙文。文章介绍了作者如何与书店结缘，并通过记录书店的日常而著书的故事。41.D。42.B。根据I was quite certain that it would be closed within the year可知，作者清楚地记得和一个朋友路过书店，并发表了评论。43.A。根据The Book Shop、called in to see和Three Fevers by Leo Walmsley可知，此处指作者到书店询问是否有利奥·沃姆斯莱的《三场热病》这本书。copy在此意为“（书的）一本”。44.C。根据He suggested that I buy his shop since he was eager to retire可知，作者是和店主在聊天。45.B。根据I buy his shop和the place became mine可知，作者应该是想找一份自己喜欢的工作。

团GLOBAL ENGLS团若美花报社EARNING ENGLISH5.孩子们的精彩表演使这出老戏变得生动起来。(bring ..to life)新课程外研高二The children's wonderful performance brought(选择性必修1)the old play to life.第9期A3版及本期参考答案Part 1Starting out Understanding ideasPart 2 Using languageL.根据首字母提示，写出单词的正确形式。1,用括号中所给单词的适当形式填空。1.With the economy rising steadily,more and1.Over the past few years,the country'smore graduates have found jobs.economy (economic)has grown at a record pace.2.Decorated with massive ice stones,the hotel2.We left their house very early in the morning soaims to provide visitors with a good natureas not to disturb (disturb)themexperience.3.In order to protect the delicate ecosystem,the3.Right now,we are all trying to reduce thegovernment has taken a series of strictemission (emit)of greenhouse gases.measures.4.As a hotel operator (operate),Mr King4.The huge windows gave us a splendid view ofneeds to take on many responsibilities.the grounds5.Mrs Green is a conservationist5.Jonathan was wandering along the street,(conservation)from the UK and devoteshungry and tired,when he caught sight of aherself to protecting the ocean.small restaurant.gⅡ.根据汉语意思，使用括号中所给的短语或句型结构翻译下列句子。Ⅱ.用括号中所给单词的适当形式填空，注意时态。1.当我还是个孩子时，父亲会在闲暇时带我去1.The clown has been working (work)for the主题公园。(at one's leisure)When I was a child,my father would takecircus since he was young.me to the theme park at his leisure2.They have been discussing (discuss)how to2.因为写得仓促，她没有注意其中的拼写错误。solve the difficult problem since 9:00 am.(现在分词作状语)3.Whales have been facing (face)seriousWriting hurriedly as she was,she didn't noticedanger for a long time,so we must take actionthe spelling errors.to protect them.3.潍坊制作风筝的历史悠久，有一些记录表明，第一个木制风筝是在2000多年前被发明的。(with复合结构)4.Mrs Brown has been studying (study)Weifang has a long history of kite making,withthe conflict between humans and lions forsome records suggesting the first wooden kitemany years,hoping to find a solution.was invented over 2,000 years ago.4.苏珊正看着窗外，这时一只彩色的鸟吸引了她5.The TV channel has been broadcasting(broadcast)programs promoting的目光。(catch one'seye)traditional culture for nearly 30 years.Susan was looking out of the window when acolorful bird caught her eye.

个阳侧所名款高江单无测以中是多调@所名状高三单无消以年至。无记Cg(0)>g(1)侧分标们四为儿是文又在R的有火有们D.g-1=gD米记【答案B0.已知函数/-则A.fx)是奇函数Bx)的图象关于直线x=号对称【答案】A《已某瑞数据的样本量为0心，均数为3，方差为56，现发现在收集这些数据时，其中的两个数起Cfx)是偶函数是背款个得定录为站用个情将过记录为化在对精误的数据法行更正后D.f(x)的图象关于点（受，0）对称得样本均数为，方差为，则Ax=39.x56Cx=39,x2=56D.r56sin(-2x）【解据分新】报收是的8个准确数紫分到为An,“,器为8十52=5十2，新家x一9，sin 2r。心守专【答案】AD1.已知正实数a,b满足a十b一ab,则下列不等式-定成立的是A.ab≥4B.a+2b>6=-9y+(-39++(-39+38]>56c是+>D.d+F≥8【答案】B【解题分折】由a>0.6>0,a十6=b2V画，得a含且收音。=-2时取等号成A老领正7.已知抛物线Cy=2pr(p>0)的焦点为F,抛物线上两点A,B在第四象限，且满足AP=3,由叶b=b,得十古-1，a叶+2=(u+20合+片-3+兽+号9+2信且数音-=1+家BF=5,A产，A方=0，则直线AB的斜率为号)，故B选项错误；A一B士√3C.-√15D.±√15【解题分析】股Am),B为)，且直线AB的斜率为太.由题意知点A,B在第四家展，所以8,款D送项正黄【答案】ACD则n-=2,4B=,P+·m一五=2+百=4，所以k=一3【答案】A12.已知0为坐标原点，下，F,分别为双曲线C号寸-=1的左，右焦点，P是双鱼线C上的任意8.已知a=l0g2,b=l0g3,c=l0g4,则点，则下列说法正确的是A.a>bycB.c>b>aC.b>acD.a>c>6A.存在点P,满足PF=3引PF【解题分桥】授据题意，构造西数f代x)=0gnx一n-Dx>1D,且点P到两渐近线的距离的乘积为In(r+1)InxC.若直线y=kx与双曲线C相交于A,B两点，M为双曲线C上不同于A,B的一点，且直线则fx=r+1Dx+1(x+1)n(x+1)-xnx(r+1)[In(r+1)]◆gx)=x山x,则gx)=nx十1，当x>1时，g(x)>0,MA,MB的斜率分别为k1,k,则·k=号所以gz)在1，+∞)上单调递增，所以(x十1)n(x十1)>xhx(x>1),即f(x)>0,所以f(x)在(1，十∞)上单满是塘，所以c>>a,放选BD.若∠FPF=,则△FPF的面积为3【答案B【解题分析】对于A选项，若存在点P,使得P℉，=3引PF,,则点P必在双曲C的右支上，由定义得PE,一二，选择题：本题共4小题，每小题5分，共20分，在每小题给出的选项中，有多项符合题目要求全部PF=2PF,=2a,可得PF:=25-2,放A选项正确：选对的得5分，部分选对的得2分，有选错的得0分.对于B适项，设点P(面)，则乎-=1，即后一=4又渐近线方程为士2y-0,则直P到直线一-9若fx)是定义在R上的偶函数，g(x)是定义在R上的奇函数，且f(x),g(x)在[0，十o∞)上单调递减，则的E有为山=品，直P到直我十2-的更落动山-五，所秋d4正出成霜5Af(-1)

B.听对话听第六段对话，回答第11-12小题。听第一段对话，回答第6小题。(A)11.Who's Nancy?C)6.Which subject is Tim good at?A.Geography.B.History.C.Math听说A.Billy's cousin.B.Billy's sister.C.Billy's classmate.用(B)12.When will the speakers meet?听力材料用A.On Tuesday.M:Linda is talking with someone on theB.On Thursday.phone about her math homework.C.On Sunday.W:It must be Tim.He is good at math.g听第二段对话，回答第7小题。听力材料(B 7.What happened to Tony's bike?W:Billy,can you help me this Sunday?I haveA.It was sold.听problems with my report on musicalB.It was broken.instruments.C.It was stolen.应M:I'd love to,but I might be busy on Sunday.听力材料My cousin Nancy will visit me this weekendM:Is this blue bike Tony's?用W:I see.How about Thursday evening?W:It can't be his.His bike got broken yesterdayM:No problem.I'm available then.W:OK.See you then.and is still being repaired.听第三段对话，回答第8小题。·听第七段对话，回答第13-15小题。(A)8.How did Henry get home yesterday?(B)13.How did Nick feel last night?听A.By bus.B.By subway.A.Bored.B.Tired.C.Excited.C.By taxi.说(A)14.Where did the sound come from?A.Nick's bedroom.B.The kitchen.甯C.The bathroom.听力材料席(C)15.What was Nick doing before sleep?W:Did you find your wallet,Henry?A.Talking on the phone.M:No.I might have left it on the bus on my wayB.Listening to music.home yesterday.C.Watching a movie.g听第四段对话，回答第9小题。听力材料可(B 9.What will Lucy do this Friday?W:Nick,did you stay up late last night?听A.Go camping.M:No,I was tired and went to bed early.B.Go bird-watching.说W:But I heard a strange sound from your bedroom.C.Go swimming.I thought you were talking on the phone.应应M:Oh,it must be the movie.I was watching a听力材料movie before sleep.W:I see.You must have fallen asleep withoutM:Lucy,you must be excited about the bird.watching activity this Friday.turning your phone off.W:Yes.Birds'songs are the most beautifulsouin nature.C.听短文④听第五段对话，回答第10小题。(O16.Where did Mrs.Dee leave her wallet?听C)10.What are the speakers talking about?A.In a park.B.In a restaurant.A.A book.B.A rabbit.C.Acup.听C.In a supermarket.(A)17.What color is Mrs.Dee's wallet?席听力材料A.Black.B.Yellow.C.PurpleM:Whose cup is it?用(B)18.What was not in Mrs.Dee's wallet?W:There is a rabbit on it,so it might belong toA.Several bank cards.Eric or Molly.They both like rabbits.B.A set of keys.C.Some money.5

从而a≤g(xmm=g(1)=-1…10分经检验知，当a=-1时，函数f(x)不是常函数，所以a的取值范围是a≤-112分20.(1)ac=32(2月【详解】(1)若选①a2-b2+c2=2,由余弦定理可得b2=a2+c2-2 ac cos B,.1=aCC0SB,….2分=号cosB=M-nB-22又sinB='，4分:ac=3W26分4若选②AB.BC=-1,则BBCcos((π-B)=-accosB=-1,.2分又simB=号cosB=V-n㎡B=251.4分·ac=326分(2)由正弦定理Q=b=2R（R为△ABC外接圆半径)，sin A sin B sinC可得ac=2 R sin A.2 R sinC=4R2 sin Asin C,叉：'sin AsinC=232’ac=48分:3=4Rx5,解得R=名43410分311∴.b=2 Rsin B=2×43212分21.(1):(2)45-310【详解】(1)f(x)=2cos2wx-1+2W3 cosoxsin@x=cos2wxh√厂3sin2wx=2si2ωx4分由于直线x=号是函数)=2n做+名的一条对称轴，65分1∴.0=k+(k∈Z),又0

)对比分析图乙中的上.小点，可知化学反度速率与雅化的种方有先2请从能化剂的角度解释在实验过程中，上述两个反应鼠然化学反应速率不网，但完全反应后两个装置内压强相同的原因，3)实验过程中均发现，压强达到最大值后又略微下降，其原因可能是得分评卷人三、计算题。(3分)17.(3分)利用脱氧剂也可以测定空气中氧气的含量（装置如图），8分钟后测得的数据如表：实验前的体积实验后的体积集气瓶内空气烧杯内蒸馏水烧杯内剩余蒸馏水130.0mL90.0mL64.9mL不(铁系脱氧剂主要成份是铁粉，还含有活性炭及少量氯化钠。铁系脱氧剂的原理是铁消耗包装袋内的氧气而变成铁锈。)(1)请计算出空气中氧气的体积分数（写出计算过程，计算结果保留一位小数）。纸壁铁碳水合物(2)乡实验测定的空气中氧气体积分数与理论数值存在偏差，请分折出现偏整的可能原因：(写一点)九年级期中化学试香第。则（共6项）8LS OAIA

第二节On May 2,the paintings,59.which represent the rich culture and第history of Shandong,60.were(be)on display at the 2023 UN阅读下面短文，从短文后的选项中选出可以填入空Chinese Language Day event in Vienna,Austria.白处的最佳选项。选项中有两项为多余选项。第三部分Officials of the UN and international organizations 61.publiclyDo you feel as thouh you don't have time and you're not smller.ore rkableint(public)praised the paintings by the artists.The paintings wereeally in con oftme?It is much preferable to spend one hourowards your goals.This can alsodonated to the UN Office at Vienna and other international分organizations 62.as gifts representing hope for continuedIt allows you to know where your time is being spent You cann as block schedulincultural exchanges.ee how much time you have available for other cvtes bybeingT"A beautiful painting,filled 63.with lots of emotion.Thankabout your usable time and organizing your must-do items.This A Keep track of vou言运the artists for this kind gift,"said a message 64.left(leave)by(徐先序)your rk and make better ue time读Chetna Lakhoo-Verbeek,the director at the Division of ConferenceC Setting time limits can help you get things doneD.While you can't cortrol time itself,you can comtrol how you spend iand Document Services under the International Atomic Energyan6 e of mpenh自sado关ealeFenAgency."We have much gratitude for the 65.richness (rich)ofrrtieoyafew of your goalsWhatever you ve traIand planned is meaChinese culture and language,"said Ahed Sboul,chief ofOnce yo'vedeemdprogress towards your goals withouconference management at the UN Office at Vienna.昌心第第一节阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。Ebony Rhodes is a single mother with four children.Since they第一节didn't have a 41,they slept in their car.Ebony was aware that it wasn't四safe,but it was the 42 choice for her at the time,as no shelter agreed to假定你是李华，外教Alice在口语课上给出的训分43 them in as a family.练话题太难，你认为这样存在问题。请你给外教写One day,as she was driving her kids to the library,a policeman44 her over.When the police officer talked to her,she realized that her封邮件，内容包括：语言运license was45,so her car was impounded(扣押).1.说明问题；(A)41.A.homeB.bedC.tentD.job(C)42.A.easiestB.worstC.bestD.hardest(B)43.A.putB.takeC.showD.employ磊2.提出建议注意：写作词数应为80左右。(A)44.A.pulledB.passed C.turnedD.ran(D)45.A.out of orderB.out of shapeC.out of reachD.out of date46,her story reached Atlanta Police Department Deputy Chief JeffOne possible version:第三部Glazier,who knew that he couldn't just let Ebony and her children 47 toDear Alice,live that way.Officer Glazier and the other policemen at the 48worked第四部分I am Li Hua from Class 2,Grade 11.I think the training topicstogether to 49 an apartment for Ebony.What's more,a GoFundMegiven to us in oral English classes are always too difficult for us toaccount was 50 by Officer Glazier and his colleagues to ensure thatpractice with our limited vocabulary.Ebony and her children would have what they 51,from payment for rentTopics,such as Al,3D printing and robotics,may not produce theto food and clothing.They also wanted to make sure that the family wouldresults you want.To solve the problem,I suggest that you provide us语with necessary background information such as key words related tonever have to 52 the night in a car again(B)46.A.Similarly B.Luckily C.Disappointingly D.Unsurprisinglythe topics.In addition,it would be better for you to choose easier(B)47.A.learnB.continue C.manageD.preparedaily life topics for us(C)48.A.restaurantB.hospital C.stationD.hotelI would appreciate it if you could take my suggestions into用(C)49.A.sellB.measure C.secureD.decorate作consideration.(D)50.A.held backB.found outC.called offD.set upYours(B)51.A.earnedB.required C.imaginedD.descri(D)52.A.celebrate感(范文中的画线句子可作为佳句背诵)B.enjoyC.rememberD.spend第第二节阅读下面材料，根据其内容和所给段落开头语A year after the 53 incident,Ebony is working as a manager for a续写两段，使之构成一篇完整的短文。estaurant and is able to 54 the cost of rent.Ebony became 55 with注意：Officer Glazier and the rest of the Atlanta Police Department.Officer1.续写词数应为150左右；分Glazier said he and the whole Police Department were there for them if第四部分2.请按如下格式作答。they needed someone to lean onA blue vase on the shelf(A)53.A.life-changingB.risk-takingjumped and fell onto the floor,breaking into pieces.言运C.heartbreakingD.troublemaking(C)54.A.estimateB.count写C.coverD.reduceWhen June opened the door,d AmyAmy handed her a gift,saying(A)55.A.friendsB.partners"Hap...happy birthday,gC.colleaguesD.neighbors感June!"第二节阅读下面短文，在空白处填入1个适当的单词或括第三部分One possible version:号内单词的正确形式。As is known to all,the peony is widely seen asA blue vase on the shelf jumped and fell onto theChina's 56.national(nation)flower.In Chinese culture,theflower 57.is considered_(consider)to be a symbol of goodfortune and prosperity(繁荣).四部分floor,breaking into pieces.Unstoppable tears flowedas June picked up the pieces.Ten years of friendshipbroke like the vase.June felt great pain.After theirJuye County,located in East China's Shandong Province,argument,Amy eventually realized June was herthe home of peony flowers,is also the hometown of Chinese言运fine brushwork paintings and rural folk paintings(民俗画)，true friend and that her behavior hurt June.AmyLocal artists,many of them also farmers,paint traditionalwas so regretful.Soon,June's 15th birthday came.pictures of peonies to make 58.a living.The paintings作She missed Amy.She could still remember an imagefrom this small county are shown not only in people's livinof 4-year-old Amy holding out the vase to her.rooms and offices,but also at key international events.Suddenly,the doorbell rang.

第二节阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。【写作提示】四本文的语篇类型是记叙文，讲述了三个孩子为It was a sunny morning decades ago.Three kids四了去隔壁城镇玩，又逃票扒火车。查票员发现后晕decided to take the train to the next town to have很生气，但他没有像往常那样只是口头警告他们，fun and then return that late afternoon.But they而是在火车到站后，要求他们跟他走。孩子们担didn't buy tickets.心查票员要把他们送去监狱，但实际上查票员要While the old-fashioned train started running,带他们去一个曾经也经常逃票扒火车的人Mike家Sam jumped into the first coach of the train.His里。friends,Jim and Jack,followed him and jumped in.1.根据续写第一段首句可知，走了大约一英里Sam felt relieved,seeing they were safe.But just后，他们来到了Mike家。查票员会告知Mike他的then he was shocked to see Mr Taylor,a ticket来意吗？孩子们在Mike家里看到了什么？examiner,enter the coach from the other end.Looking at the fast leaving platform,Jim四whispered where on earth he was coming from."He must have seen us boarding this coach,"said四2.根据续写第二段首句可知，孩子们发现了Jack.写作Mike没有双腿。他们会是什么反应呢？Mike"Look!He is coming towards us.Let's make sad为何失去双腿？孩子们得到教训了吗？他们以faces and try to win his sympathy(同情)，”Sam作后还会逃票扒火车吗？suggested.It did not take long for Mr Taylor tocheck the other passengers'tickets and come tothe kids.The kids said sorry and explained thattheir tickets had fallen out of their pockets whileboarding the train."Really?Whenever I'vechecked,you couldn't show your tickets,"saidgMr Taylor angrily."I'll teach you a lesson.It'll help四you to keep your tickets safe."One possible version:The kids were used to this reaction.Mr Taylor四After walking a mile or so,they reached Mike'shad caught them several times.He would always写作house.Mr Taylor first entered and a moment laterthreaten to punish them for travelling withoutcame out.He took the kids inside.There,in thetickets.But as the station in the next towndim light of a lantern,the kids could see someoneapproached,he would just say,"Look,boys,it is notsitting on a bed.He seemed to be a grown-up man,good to travel like this.The next time I find youbut there was something abnormal about him.without tickets,I'll have you sent to prison."He“Mike,”said Mr Taylor,,addressing him,“get up,then let the kids go.will you?"Mike tried to stand up,but it seemedThe kids were confident that this time Mr Taylordifficult.would also let them go.However,when the trainIt was then that the kids noticed Mike had no四reached the station in the next town,he orderedthe kids to follow him out of the station.The kids四legs."When I was young,I also often traveledwithout tickets."Mike said."But once I fell off写anxiously wondered,"Is he really bringing us tothe prison'?”Actually,Mr Taylor was bringing them to the写作the train when trying to catch the running trainand lost my legs."The kids stood still,shocked.They realized trying to avoid tickets could havehouse of Mike,a man who also often traveledsuch consequences.Thus,they promised they'dwithout tickets when he was young.never do it again.Mr Taylor finally smiled with注意：relief and bought them that day's return tickets1.续写词数应为150左右；using his own money.The kids were so grateful2.请按如下格式作答。and developed a great respect for Mr Taylor.详见答案解析页四After walking a mile or so,they reached Mike'shouse.晕It was then that the kids noticed Mike had nolegs.9

若=则oa-土，所以s血，-士V一日-士号放D正确，故应选AD.)11.ABC(A选项，圆心为(k,),一定在直线y=x上，A正确；B选项，将(3,0)代人得：2k一6k十5=0，其中△=-40，故经过点(2,2)的圆C有两个，故C正确；D选项，所有圆的半径为2，面积为4π，故D错误故应选ABC.)12.AD(函数fD）=ar+(ab≠0)，定义域(-m,0)U(0,+w).且f(-)=a(-0+0=一ax一b=一f(x),函数f(x)是奇函数，A选项正确；设直线y=x,联立方程：a以+名-bz,得（函-a)2-b=0,k-0≠0，△=46(k-a)≠0，直线y=b虹不可能是f(x)的一条切线，B选项错误，者u)=f子则a+名=u,+乌得-名2即in(sin十2)=名由snr的有界性，显然smr(snr+2)-。不一定有解，C选项错误当a>0,b0,所以函数g(x)=2x十s1n2的定义域为全体实数，x2+t因为g(-x)--2x-sinzx2+t=-g(x),所以函数g(x)=2x十sinz是奇函数，它的图象关于原点对称，x2十t因此g（c)max十g(x)min=0,因为f(x)ox=t+g(x)nmx=M,f(x)mm=t+g(x)mm=N,所以由M+N=4→2t=4→t=2.)15.5(因为sing-2c0a=1,2sia+c09=V2,数学参考答案第3页