Text 6第2.What will the man do today?A.Have a picnic第W:I think this brown table and these chairs aresuitable for our living room.(6)Find a house.M:Right.Oh,they are $2,500 in total.Why don't weC.Look for a job.分听力材料Text2努look at other tables and chairs?We have morechoices.(6)W:Would you like to have a picnic with me on suchW:But the shop clerk told me that she would give us听a fine day?a discount if we bought them today.And I don'tM:I'd love to,but I can't.I need to find a place to力think we can find anything better than these.live for my brother today.(2)He decides to workM:Fine,you're the boss.I'm going to pay for themin this city.(7)Then let's buy a washing machine later.③®W:OK.I can't wait to decorate our new apartmen听第7段材料，回答第8至10题。第3.How does the man feel?第8.Who is Mrs Green probably?A.Satisfied.A.Jackson's neighbor.B.NervousJackson's teacher.努Upset.努C.Jackson's mother.9.What happened to Jackson at school?听力材料Text3He had a fight.M:I wish I hadn't attended that meeting.(3)B.He missed classes.C.He broke the window.力W:Why?10.What will the man do to solve the problem?M:Well,I was talking about my ideas on the new力A.Ask Jackson's grandparents.product,but no one listened to me.(3)B.Go to Jackson's school.gHave a family meeting.4.What is the probable relationship between theText 7第speakers?第M:I just got a call from Mrs Green.She told me somethingA.Teacher and student.that happened to Jackson.(8)W:What?Did Jackson get into trouble at school?⑨Mother and son.He just broke our neighbor's window yesterday.C.Classmates分分M:Calm down.Listen to me.He got into a fight with hisdeskmate in the afternoon.(9)听力材料Text4W:I can't believe why you're always so calm.How could he听W:How are you getting on with chemistry?M:It is difficult for me.The more my teacher听make so much trouble at such a young age?M:All right.Don't worry.I'll handle it this time.I'm going toteaches,the less I understand.figure out what happened exactly,and then I intend to holda family meeting to talk about it with him.(10)W:Maybe you can ask your friends for help.NowW:I think we should call his grandparents.I'm sure theywash your hands.Let's have lunch first.(4)have more experience than we do.听第8段材料，回答第11至13题。④第5.What are the speakers mainly talking about?A weekend plan.第11.Which bus will the boy take?A.No.11.B.The man's hobbies.B.No.58.努C.The woman's ideas.⊙9No.158.听力材料Text5努12.Where will the boy go in the afternoon?W:Alex,what are you going to do at the weekend?To the market.B.To the hall.听(5)C.To the parkM:I plan to go horse riding and hiking with my力13.How is the weather now?friends.(5)Would you like to go with us?A.Cloudy.W:Okay.Why not?⑧区Text 8第第二节听第6段材料，回答第6、7题。④第M:Mom,do you know if I should take Bus No.11 orBus No.158 to the Marine Hall?(11)部6.What are the speakers doing?W:No.158.(11)In fact,No.11 used to get there.ButPicking up furniture.recently it changed its route due to roadconstruction.B.Cleaning tables and chairs.分M:Oh,I see.Thank you,Mom.C.Decorating their apartmentW:David,are you going to the Marine Hall with your听7.What is the man going to do?classmates this afternoon?I thought you were goingA.Turn on the washing machine.力to the flowers and birds market.(12)B.Look for another apartment.M:Yeah,that's true.(12)The market we're going to isPay for the items.opposite the Marine Hall.There's also an amusementpark and a shopping mall nearby.

8.In fact,these old men don't like to go to such anoisy placeB:I used to go there by plane,but this time IIn fact,these old men hate going to such atried a different way.I chose the train at last.noisy place.A:(4)How was your train ride?9.With the help of her teachers,she could continueB:It was comfortable.I saw many thingsher studies.Without the help of her teachers,she couldn'tinstead of just clouds outside the window.continue her studies.A:Sounds interesting!10.Not only the students but also the teachers haveB:What about you?taken part in the activity.(5)Where did you go during the holiday?Both the students andthe teachers.A:Well,I went to Beijing with my family.8have taken part in the activity.⑧Ⅲ.根据汉语意思完成英语句子，每空一词。Passages1.小心用火很重要。【.根据材料内容，从下面五个选项中选出能填入文中空缺处It's important to be careful with fire.的最佳选项，使文章意思通顺、内容完整。2.您要不要另外决定个时间？I arrived in China a few months ago.LikeWould you like to decideon another time?3.爱丽丝通常不参加任何班级活动。A.I ean find food stall(摊位)easily..B.I would like to share a few of such cultureAlice doesn't usually take part in anyIt is known to all that China has a largeof the class activities.图mepertain that Chinese peopleThevat first looked amost the same.all dark4.繁忙的街道经常让我想起我的家乡。The next on my list is the language problemhaired with dark evesThe busy streets often make me think ofWhen I decided to go to China,the first thing thatAlthough many Chinese learned English whethey were at school,they don't speakmy hometown.came to my mind was how to communicate withothers.3 Luckily,I am always able to find help5.顺便问一下，今晚你要和谁一起去看电影？By the waywho are you going to thecinema with tonight?6.我有很多爱好，比如跳舞、唱歌和游泳。The next one is my favorite one.China isI have many hobbies,such as dancingfamous for its delicious food.A4 They areeverywhere.Honestly,I have never seen a food stallA.I can findfood stalls(摊4to share a few of such cultusinging,and swimming.empty in China no matter what is being sold there7.为了赢得比赛，他每关练踢足球。atChinese peoplHowever,no matter what a foreigner goesHe practices playing football every day inthrough,life in China can be a total adventurethe same.all darkorder to win the match.)C5 Whenever I meet with difficulty,I amalthough many chse learned english whe8.当他第一次来到这里时，他发现这里的生活有点sure to get a helping hand from the strangershey were at school,they don't speak it often难以适应。生人)to solve my problem.When he first came here,he found life here a bitdifficult to getusedto③A:Have you decided where to travel this year,CommunicationⅡ.阅读短文，从方框中选择适当的词并用其正确形式填空Mary?B:(1)Not yet使短文通顺、意思完整。每空限填一词，每词限用一次。④It's reallyhard to make a decision.progress twosmall changedevelop根据下面的对话A:Why don't you visit Mount Huang?It's oneworrylargefall情景，在每个空of the most famous mountains in China.howeverB:Sounds like a good idea.(2)Since 1950,China has been the most populous fefor the first time in sixty years.Since 2011.白处填上一个适Is it far from here(人口多的)country in the world,followed closelyby India.However,this wifhangeoon.Onb nd年maene h当的句子，使对A:No,it lies in the south of Anhui Province,notfar from hereApril 19th,the UN said that India would have 3opulation can be both good话的意思连贯、B:(3)What is it famous for 2million more people than China by the middl完整。A:It is famous for its natural wonders.It's really2023.This means that China will drodeo之or本e me ume.a good nlace to visitplace in the world population rankings(排名)it caaseany problems,like food,educationB:(4When is the best time to visit itSo far.China and India have more than oneand health problenA:Autumn is the best time to visit Mount Huangthat many ppopulationwith the best weather and fewer tourists.mg6今cmeBne IndianB:Sounds great (Thanks for your advicenumbers should not cause worry.Instead,theyslowing down.Last year,China's populationshould be seen as a symbol ofprogressA:You're welcome.Shantang village,a village in ZhejiangⅢ.在横线上填写合适的句子完成对话。.阅读短文，根据语篇要求填A:I hear you went to Hangzhou during the空，使短文通顺、Shantang villagein the northeast ofsummer holidays again.How long did you stay意思完整。每空Guangchen town.In this village,visitors can enjoyits natural beauty.They can walk on grasslandsthere?限填一词。and go through lush(茂密的)treesThe locaB:(1)I stayed there for two weeksgovernment has also restored(修复)an3-oldstreet dating back to the Qing Dynasty to developA:(2)Why do you often go there?For travelling?tourism in the village.Last year,the villagewelcomed 400,000 visitors andade over 20B:No,I go to visit my grandpa.He lives theremillion yuan.Its tourism has greatly improvedwith my uncle.I'd like to spend some time withthe local people's lives.Morhim.about their hometownA:I see.(3)How did you go there this time?ByWhen they saw the news that the government wasproviding support and advice for small businesses,air?they decidedto 5 go back to their hometownand work there6

选择性必修二Unit3参考答案及部分解析参考答案1-5 BACAB6-10 ACBCB11-15 ACBBA16-20 ACBCA

We did some shopping in an open-air marketplace called "souk".My cousinbought some pots and I got a couple of scarves.I also bought some hats for myfriends.M:I'm not sure if I'd enjoy that kind of holiday.W:What do you mean?M:When I go on holiday,I prefer hanging out on beaches.It's much more relaxing.(Text 8)M:Mary,I read a story about chef Chante Basden from a book in our school library.You enjoy cooking so much.You must know her,don't you?W:Of course.She is one of my favorite cooks.She has childhood memories oflearning to cook with her grandma.Her passion for helping others was born out ofa crisis.In 2019,when Hurricane Dorian approached her community,she wasdetermined to make and share bread to help others.M:Yes.She also started a fund to feed the hungry and teach simple skills that helpothers produce their own bread or other food.W:I want to be a cook like her.I've read many cooking books and taken somecooking courses.Oh,I'll take part in a cooking competition held by the cookingclub on Friday.Would you like to come and watch it?M:Absolutely!I believe you can do a good job!(Text 9)W:Today,I'm interviewing photographer Marc Pasqual,who enjoys posting variouspictures on social networking apps.Marc,what made you want to do that full-time?

体的格局是由各个字商王的所保留2024届意一Time:SeptemberGREAT NORTH LINKS CHALLENGE(of the Chinese Consulate General in Los Angeles Wang Taiyu."We hope through suchCalling all golfers:You can enter this three-day event-spread along the north coast betweenactivities,we can promote friendship between Chinese and American peoples,and contribute toChina-US relations,"he said.Ballyliffin,Portruth and Portstewart,as an individual or team of four.A perfect opportunity to playthree Irish Open links courses in three days.24.Whal c we infer about Shaolin Kung FphBTime:18-20 OctoberA.It was performed on a school's playground.B.Orange County didn't enjoy it often.C.Its performance lasted two weeks.ARMAGH FOOD AND CIDER WEEKENDD.It attracted vistiors all over the world.A four-day feast of authentic food and artisan eiders(苹果酒)in Ireland's“Orchard County”,25.According to Anne Shih,what benefits does the event bring?A.Helping Southern Californians lear Chinese quickly.This celebration is also coupled with the traditional apple harvest.You can taste local food from theB.Helping audiences become Kung Fu masters through practice.country's most inventive chefs.C.Helping audiences have a better knowledge of Chinese traditions.Time:SeptemberD.Helping Orange County attract more Kung Fu lovers around the world.OULD LAMMAS FAIR26.How does Larry Lee think of Chinese martial arts?APeople have been flocking to the seaside town of Ballycastle since the 17th century to celebrateA.They include wisdom in them.this fair.Attractions inelude a Heavy Horse Show,horse speed events on the beach,funfair,outdoorB.They focus mainly on fighting.concert and a fireworks display,as well as unique local produce and handmade arts and crafts.C.They represent Chinese culture and history.Time:last week of AugustD.They inspire you to be expert at Chinese medicine.21.What is the best date to arrive if you want to attend GREAT NORTH LINKS CHALLENGE?27.Why is the event held in Wang Taiyu's opinion?A.October 17thB.August 18th.C.October 20th.D.September Ist.A.To stress the importance of communities.B.To advise how to understand each other.22.What can people do at the town of Ballycastle?C.To compare different cultures.D.To build up better friendships.A.Play golf.B.Go hiking.C.Watch horse races.D.Taste apple cidersSchools across the US East Coast canceled outdoor activities,commercial airline traffie was23.In which section of a website can we probably read this text?slowed and millions of Americans were urged to stay indoors on Wednesday as smoke from CanadianA.Tourism.B.Sports.C.Education.D.Arts.wildfires drifted south,blanketing cities in thick and yellow smoke."It's critical that Americans experiencing dangerous air pollution,especially those with healthA perfect performance of Chinese Shaolin Kung Fu amazed hundreds of audiences in Bowersconditions,listen to local authorities to protect themselves and their families,"US President JoeMuseum in US Southern California on Sunday.Biden saidThis Kung Fu demonstration by Shaolin monks()was a highlight of the 2023 Shaolin.New York's world-famous skyline,usually visible for miles,disappeared because of the smokeCultural Day,a rare cultural event for the Orange County community in Southern California.which some residents said made them feel unwell."The event offers a unique opportunity for the Orange County community to actively engage with"It makes breathing difficult,"Mohammed Abass said as he walked down Broadway inShaolin culture and gain firsthand experience in various Shaolin activities,"said Anne Shih,Manhattan."I've been scheduled for a road test for driving,for my driving license today,and it waschairwoman of the Board of Governors of Bowers Museum."Whether it's learning from Kung Fucanceled."masters or enjoying interactive Shaolin activities,these experiences will help audiences to experience"It looks like Mars out there,"said Fox Forecast Center meteorologist Brian Mastro justthe Chinese culture and better understand Chinese traditions,"Shih said.before 2 p.m.With a history of over 1,500 years,Shaolin Kung Fu is one of China's most treasured culturalNew York Governor Kathy Hochul called the situation an"emergency crisis,"noting that the airheritage items,and has been practiced by Kung Fu lovers around the world.pollution index for parts of her state were eight times above normal.Larry Lee,a 72-year-old resident of Orange County,said he has been practicing Kung Fu forIn Bethesda,Maryland,a high school moved its graduation ceremony indoors,while a Brooklyn,over 50 years."The traditional Chinese martial arts have deep intelligence in it.They relate to a wayNew York,elementary school deferred its "Spring Fling"dance party.A school in Montclair,Newof life that goes much deeper than just fighting."Lee said besides Kung Fu,he is also interested inJersey,called off a fifth-grade trip to an amusement park.Chinese medicine and other elements of the Chinese culture.The smoke was wafting()over the US northern border from Canada,where hundreds ofThe 2023 Shaolin Cultural Day served as a fitting finale (to the 2023 Asian Americanforest fires have burnt 9.4 million acres and forced 120,000 people from their homes in an unusuallyPacific Islander (AAPI)Heritage Month,providing a platform to honor and appreciate theearly and intense start to Canada's wildfire season.contributions of the AAPI community.Tyrone Sylvester,66,playing chess outside in Manhattan's Union Square as he has on most days"The event will help people of other communities to be better informed about China and thefor 30 years,but wearing a mask,said he had never seen the city's air quality so bad."When the suChinese culture,and therefore developing understanding and friendship,"said Cultural Counselorlooks like that,"he said,pointing at the smoky sky,"we know something's wrong.This is what英语试题第3页（共8页）英语试题第4页（共8页）

主题语境：人与自我一一生活与学本文是应用文。文章介绍了一个金钱管理的新人训练营的相关信息。2l.D。理解具体信息。根据Boot Camp Details部分中的Interaction with peers in a virtualclassroom可知，参加训练营的学生能与同伴开展线上互动。22.A。理解具体信息。根据Boot Camp Details部分中的Certificates presented upon completion可知，训练营结束后，学员会获得一个证书。23.B。理解具体信息。根据Session Information and Cost部分中的Sessions offeredMonday-Friday,10am-12pm EST,and 1pm-3pm EST.Students may choose...The 5-dayBudgeting&Beyond Boot Camp和2-hour--long sessions run twice daily可知，单次训练营持续五天，每天安排两次两小时的课，学生可根据自身情况选择其中一个学时段。因此，在为期一周的训练营中，一个学生总共需要上十小时的课。【补充解释】boot camp:新兵训练营，新人训练营B篇主题语境：人与自我一一生活本文是记叙文。作者通过一场旅行增进了对父亲的了解。24.D。推断。根据第一段中的So it won't come as a surprise...with the crossword可知，作者最近硬拉着他的父亲前往Scarborough旅行。父亲在旅行的第一个小时里表现得像一个人质，但当他们抵达Reading时，父亲已经在帮助邻座的一对夫妻解字迷了。由此可推知，随着旅程的进行，作者父亲的态度发生了变化。25.B。理解具体信息。根据第二段中的I knew his outline well enough…I hoped thatScarborough might fill in some gaps可知，作者了解父亲的大概情况，但对细节却没那么了解，他希望通过这次Scarborough之旅来补充这些缺失的信息。也就是说，作者想更深入地了解他的父亲。26.C。理解目的。根据第三段中的Away from his fixed address,.Dad began doing uncommonthings可知，踏上旅程之后，作者的父亲开始做一些时不做的事情。下文接着进行了举例说明。其中一个例子提到：面对耳目一新的美景，父亲的思绪也漫游了起来，聊天内容也随之变得散漫，来自约克郡的Margherita便是父亲闲谈的内容。由此可知，作者提及来自约克郡的Margherita,是为了描述父亲在新环境中的样子。27.D。理解主旨要义。本文主要讲述了一场父子之间的旅行。根据全文最后一句I could havedone without seeing that side of him可知，没有这场旅行，作者可能就看不到父亲的那一面，点明了文章主题。由此可推知，D项最能概括本文主旨，适合作本文标题。【补充解释】1.have a thing for.(para.1):对…有一种强烈的感情2.go walkabout(para.3:漫游C篇主题语境：人与社会一一文化本文是说明文。多年来，Annie Katsura Rollins致力于研究中国皮影戏，并努力寻找能够帮助这一古老的表演形式应对文化变革、城市化和现代娱乐形式冲击的方法。28.B。理解具体信息。根据第一段中的Annie Katsura Rollins,who is based in Toronto andresearching Chinese shadow puppetry,has spent years developing an expertise in Chineseshadow puppetry可知，Rollins花了好几年时间专攻中国皮影戏的技艺，同时为了帮助中国皮影戏在文化变迁、城市化和现代娱乐形式的冲击下幸存下来，Rollins也付出了巨大的努力。29.D。理解词汇。根据划线词后面的Actually,traditions are always changing in history and wejust fail to witness it the tradition needs to be with the present and be looking toward the

15答案AD解题分析本题考查CIO2和NaClO2的制备流程分析。在无隔膜电解槽中持续电解一段时间后，生成H2、NaCIO3,阳极是氯离子失电子，发生氧化反应，生成的氯气和氢氧化钠溶液反应生成氯酸钠，阴极发生反应：2H2O+2eH2个+2OH-,A项正确；发生器中发生的反应是氯酸钠在酸溶液中氧化二氧化硫生成二氧化氯和硫酸，反应的离子方程式为2C1O3+SO2一2C1O2+SO,由信息可知，纯CO2易分解爆炸，一般用稀有气体或空气稀释到10%以下较为安全，则发生器中鼓入空气的作用应是稀释CIO2以防止爆炸，B项错误；根据流程可知，吸收塔内生成NaClO2,所以一定有CIO2→NaClO2,化合价降低，被还原，则H2O2被氧化，有氧气产生，反应的化学方程式为2NaOH+2CIO2十H2O22 NaCIO2+2H2O+O2,C项错误；得到的NaClO2·3H2O粗晶体经过重结晶可得到纯度更高的晶体，D项正确。16答案(1)1s22s22p3s23p63d9{或[Ar]3d9}(1分)(2)sp3;sp2(各1分)(3)①三角锥形②4；16（各1分）(4)SnCl4、SnBr4、SnI4属于分子晶体，分子晶体的相对分子质量越大，分子间作用力越大，熔、沸点越高(2分)(5)50%:(,1,)(各2分)4’4’417答累(1)+3;Fe(OH)3(各1分)(2)Co2O3+6H++2C1-—2Co2++C12◆+3H2O;1:2(各2分)(3)1×103a-47);在Mg2+转化为Mg(OH)2过程中，会有Co(OH)2生成（各2分）350℃(4)CoC2O4=CoO+CO个+CO2个(2分)

参考答案1-5 BACAB6-10 CBBCA11-15 CBACC 16-20 BAACB21-25 BDAAB 26-30 BCCAB31-35 DDCAD 36-40 CDABG41-45 BACDA46-50 BCBDC 51-55 ADBAC56.constructed57.corresponds58.architectural59.transformation60.an61.to●62.stairways63.which /that64.is restricted65.to ensure写作（划线部分为精彩表达）第一节One possible version:Hello everyone,Today is World Hello Day,a day dedicated to promoting peace and understanding betweennations through the act of greeting.It is a day to acknowledge the power of a simple hello tobreak down social barriers.Saying hello is more than just a word;it serves as a gateway to establishing connections withothers.As students,we can make a difference by starting with our school.Let's make an effort togreet each other with a friendly hello.By embracing World Hello Day,we can demonstrate to theworld that a simple hello can go a long way.Thank you.第二节One possible version:As I stood on stage,I felt extremely nervous.My heart pounded against my chest like a wild drum.Magic Andy gave me a magician's hat and told me I would help him with his disappearing act.Iwas so nervous that I almost dropped the hat,but managed to put it on my head.I held mybreath and closed my eyes tightly,afraid of what was to come.When I opened my eyes again,Iwas relieved to see that I had not disappeared just the top hat had disappeared!A sense ofexcitement rushed through me.Magic Andy continued with more tricks and I slowly began to relax.I found myself laughing andclapping along with the audience,enjoying the show.When it was over,Magic Andy approachedme,saying that I was a great assistant and that I should try doing magic tricks of my own.Icouldn't help but feel proud.As we left,I felt a newfound confidence in myself.I was no longerthe shy and nervous person I had been before.Magic Andy had not only put on a fantastic showbut had also helped me to overcome my fears.部分解析阅读第一节A篇主题语境：人与社会一一文化本文是应用文。文章介绍了一次自驾游活动的时间、地点和费用，并且介绍了阿联酋的骆驼文化节。

Late into the night,we came together in Sarah's living room.The room was filled with creativityand love.Sarah worked on the design,while Mark and I worked together to create interestingmessages to attract our audience.As the hours passed,we shared stories,laughed,andsupported each other through the creative work.The late-night tiredness was outweighed bythe friendship.we felt as a team,joined by our shared goals of making a difference andhelping Jacob.The following day,when Jacob returned to our team,he was surprised at the progress we hadmade in his absence.Jacob's eyes welled up with emotion as he realized how much we haddone for him.With renewed energy,we continued working together,putting the finishingtouches on our campaign.On the day of the event,our team stood side by side,enjoying thefruits of our great efforts.The fundraising went beyond our expectations,allowing us to makea great difference to the cause we cared about deeply.Looking back on our journey,werealized that the strength of a team lies not only in individual ability but also in the readinessto support and help one another.部分解析阅读第一节A篇主题语境：人与自我一一生活本文是应用文。文章介绍了四个公园。21.A。理解具体信息。根据Namba Parks,,Osaka,Japan部分中的Namba Parks shopping mallThe shopping center,built in 2003,provides eight floors of commercial space forcinemas,,stores,,events and restaurants可知，Namba Parks本身也是一座商业购物中心。22.D。理解具体信息。根据Promenade Plantee,Paris,France部分中的The space wasdeveloped on a disused railway line和The High Line,New York,USA部分中的This2-kilometer public park was built on a disused railway line可知，这两个公园都建在废弃的铁路线上。23.B。理解具体信息。根据Namba Parks,Osaka,Japan部分中的built in2003、PromenadePlantee,Paris,France部分中的began in 1988 and finished in1994、Jurong Lake Gardens,,Singapore,Singapore部分中的are still under development,,the first part opened in20l9和The High Line,New York,USA部分中的between2009and2019可知，Promenade Plantee的历史最悠久。B篇主题语境：人与自我一一做人与做事本文是记叙文。去年12月的一天，一封来自瑞典的感谢信抵达清华大学物理系教授王向斌的邮箱，感谢他和学生木清发现并指出2022年诺贝尔物理学奖报告中的一处错误。24.D。理解具体信息。根据第一段中的a student who calls himself Muqing at TsinghuaUniversity was doing his physics homework.Suddenly,he discovered a problem on page 11 ofa report on the2022 Nobel Prize in Physics可知，木清在做物理作业时，发现了诺贝尔奖报告中的一处错误。25.C。理解主旨要义。根据第二段内容，尤其是主题句Muqing was not sure about his discovery可知，本段主要解释了为什么木清对他的发现不敢确定。26.B。推断。根据第三段中的Wang patiently worked on the problem with Muqing late into thenight.After several rounds of calculations,they made sure that there was really a mistake

18.(14分)2022年北京冬奥会首次使用氢能代替丙烷，体现了“绿色环保”办奥理念。丙烷脱氢制丙烯具有显著的经济价值和社会意义，丙烷无氧脱氢还可能生成甲烷、丙炔等副产物。回答下列问题：已知：I.2CH3CH2CH(g)+O2(g)=2CH3CH=CH2(g)+2H2O(g)△H1=-238kJ·mol1;衡常数K1Ⅱ.2H2(g)+02(g)=2H20(g)△H2=-484kJ·mol1;衡常数K2Ⅲ.在一定催化剂下，丙烷无氧脱氢制丙烯的热化学方程式如下：CH3CH2CH3(g)=CHCH=CH2(g)+H2(g)△3；衡常数K3。(1)△H3=,衡常数K3=（用K、K2表示)。(2)T1℃时，将1 molCH,CH2CH3(g)充入某恒容刚性密闭容器中，在催化剂作用下发生反应：CHCH2CH3(g)三CHCH=CH2(g+H2(g)。用压强传感器测出容器内体系压强随时间的变化关系如图a所示：产率%6050P/kPa40(120,148)(180,150)30(60,133)(90,143)(150,150)20100(30,118)o800250300350400T4504250306090120150180min反应温度℃图a图b①030min内，用H2的分压变化表示上述脱氢反应的均反应速率为kPa·minl。②T,℃时，反应的压强衡常数Kp=kPao③保持相同反应时间，在不同温度下，丙烯产率如图b所示，丙烯产率在425℃之前随温度升高而增大的原因可能是或425℃之后，丙烯产率快速降低的主要原因可能是(任写一点)高三化学第8页（共10页）