Professor Gunter Kuhnle,a nutritionist at the University of Reading who led the study,said,"We are delighted to see that in our study,there is a meaningful and significant associa-tion between flavanol consumption and lower blood pressure.""This study adds key insights to a growing body of evidence supporting the benefits ofdietary flavanols in health and nutrition.This suggests if the general public increased itsflavanol intake,there could be an overall reduction in cardiovascular(心血管的)disease inci-dence,”Gunter added.32.In which aspect is the study different from most other similar studies?A.Research object.B.Research method.C.Research institution.D.Research result.33.What does the underlined word "conspicuous"in paragraph 3 mean?A.Obvious.B.Constant.C.Awkward.D.Curious.34.What may Gunter advise people to do to reduce cardiovascular disease incidence?A.Adopt a healthy diet.B.Change lifestyle.C.Increase flavanol intake.D.Consume less salt and fat.35.What can be a suitable title for the text?A.Fruits like apples and berries are rich in flavonolB.Measuring nutritional biomarkers is more objectiveC.New study confirms the results of dietary interventionD.High flavanol diet may lead to lower blood pressure第二节（共5小题：每小题2分，满分10分）根据短文内容，从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。People take up volunteering for lots of different reasons.Some have a sense that theywant to give something back.36.Whatever the reason,charities in the UK really rely onvolunteers because without them,they simply wouldn't be able to carry out their work.Butbefore you take up volunteering,you should do the following.37 What sort of organization do you want to help?You might have a particularcharity in mind,Perhaps you have been affected by some of the issues that a charity aims tosupport.Many local schools rely on parents or other members of the community who come inregularly to read with the children or help with their maths.Deride on the kind of work.Once you have decided where you wawt to volunteer,youthen have to decide what sort of volunteer work you want to do.38Do you prefer hands-on work?Are you good with puople?Do you have a background in administration or secretari-al work?Charities need volunteers lo work in shops,organise or manage fundraising events.1?高三英语邻7页（共10页）0】

词工(四)夏中等补密李高英语·答案解析water and picking vegetables and fruit.At night,I buriedpick走向重点2023年高考密破考情卷宁夏（四）myself into learning.Seeing them live a happily life,I felt【听力材料】inhappyrelieved.Text 1+L.【解析】第一句的that→which。非限制性定语从句不能M:How was your trip to London?W:It was fantastic.I visited a lot of places.用that引导；which引导非限制性定语从句，修饰前面churches,museums and the royal palaces,的名词village,which在从句中作主语。ar山is门and the weather was fine.Horrible traffie,though.heB2.【解析】第二句的vegetable-→vegetables。vegetable是Text 2可数名词，many修饰名词复数。omod ob w bM:Do you like eating beef,Karen?3.【解析】第三句的go-→went。时间状语是I,ast summer词W:Not really.I hardly eat red meat such as beef,porkvacation'“去年暑假”，表达过去的动作，所以用一般过去单and mutton.eat chicken.时。M:Why?m4.【解析】第三句的here→there。.作者叙述去年暑假在那W:Many studies have tied red meat to cancer and heart里（爷爷奶奶那里）度过了一个月。o1:disease,so I think I'd better avoid such risks.5.【解析】第四句的earlier一→early。very修饰形容词和副Text 3词的原级，且这里没有比较的含义。1munM:Who is the best player in your school football team and6.【解析】第五句的early前加an.early的发音以元音音basketball team?素开头，前面用an。2W:As I know,John is the most popular one in the football7.【解析】第六句删除but。Though引导让步状语从句，team,but Jack plays the best in the team.As for the后面是主句，不能再与but连接。安basketball team,David is second to none.8.【解析】第六句的picking一pick。help sb.do sth,“帮助Text 4某人做某事”；weed,water,pick三个行的省略to的动词不定式作宾语补足语。W:I need to arrive at the ABC Corporation in haf an9.【解析】第七句的into→in。bury oneself in(doing)hour.I'm not sure if I have time to go there on a bus ormaybe I should take a taxi.sth.“埋头做某事”，固定搭配。1O.【解析】第八句的happily-→happy。形容词happy作M:It's just a ten-minute walk.Go along the street and定语，修饰后面的名词life。live a happy life过着幸福turn right.Then you will get there.1baAText 5nor to的生活。M:How much is the parking fee here?书面表达0To Study Liberal Arts or Science?W:It's 1 dollar an hour,sir.If you park your car here lessRecently there is a heated debate in our class onthan 1 hour,we charge you 1 dollar;if you park morewhether to study liberal arts or science.The students'than I hour and less than 2 hours,we charge you 2dollars and so on.opinions vary from person to person.Some students think it is better to learn liberal arts.M:OK.Let me see.I parked my car at 9:00,and it'sFirst of all,it's easier to learn liberal arts.Besides,jobs11:45now.related to liberal arts are not tiring.In contrast,science isText 6W:I was hoping that I'd go to the outdoor shopsdifficult and it takes a lot of pains to learn it.However,others hold the opposite opinions.In theirdowntown today if the weather was fine or evenview,there are a wider range of majors to choose from ifcloudy.But look outside.It's wet everywhere.It'sthey learn science.Additionally,students of science arereally disappointing.,,M:Do you want to go to the Mega Mall with me instead?easier to find a good job than students of arts.Personally,I think what is important is yourI'm going to drive my car there.It's just opened.interest,which decides whether to study liberal arts orW:That sounds good to me.Otherwise I would end upstaying at home doing nothing.science,.姑，再只加稀以水的其，行殖热自的断前感c17B

be present here.If insurance will cover crop losses due to various effects like drought or severefmmer my nor wanr to pay the extra expense for climate change adaptation efforts such as usingbhvr reoofjl)orjugeorinae.crops toimprove soil health,for example."ifyo'rd h your nd for being sis you alize that you'vbhaved theestudy models indicare that an increase of daily minimum and maxdee Celsjus would increase couny-evel cor yield variability by 8.6 bushels (busheway.Befriend tough emotions.L)per acre if so%of farmers in a county have crop insurance.The same temperature rise in acoAshumans,we're bom to avoid pain.When uncomfortable emotios arise,we may try to distracton would increase com yield variability bybu(ourselvesfrom feeling bad.We may wander thou socialedi Neix These strategesThe researchers bring up possible solutions to this situation for policymakers.They indare calleddefenses".However,we can't merely rely on defenses.3×resoen farmers use of climate change relief eorWhen upset emotions arise,try to befriend your feelings.Sta by naming your emotions.apractices and starting high-level policy conversations about how to possibly adjust rules and guideecnie psychologists call"ffect labeling."The goal isn't to change the io.buttobringerorch isncenive ecawareness to how it feels in the moment.40 By understanding them,we can uncover the cause of32.What does the study find about crop insurance?suffering.A.Feeling down?A.It ensures crop production.B.Unsatisfied with a bad result?B.It leads to uexpected side effects.CThat's what we dislike about ourselves.C.It rests in worse climate change.D.Emotional fimess can benefit stress management.D.It doesn't bring any benefits to farmers.33.Whdoehederined word subsidiesin paragraph 4 mean?E.Therefore,we can make use of them to cheer us upFTo conclude,symptoms like anxiety are the body's alarm system.B.Verbal support.A.Market support.-G.Without feeling our emotions,our ability to process them will be influenced.D.Financial aid.C.Technical assistance.第三部分语言知识运用（共两节，满分45分）34.What might explain the unintended consequence of crop insurance?第-节（共20小题：每小题1.5分，满分30分）7B.Law issue.阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最A.Moral crisis.D.Custom change.佳选项。C.Study models.35.How did the author show the effects of crop insurance on corn yield variability?A craftsman living with a disability who makes clay figurines (has recently made netizensB.By making a comparison.amazed across the country.A.By doing experiments.to fate,he gradually learned to eatC.By listing figures.D.By consulting experts.In 2003,Mi 41 his hands in a crash.Unwilling toand get dressed in the year that followed the unexpected43).After.seeing a craftsman making第二节七选五（供5小题：每小题2分，满分10分）When you are anxious and stressed,you could add anmotiona workoutfigurines on the street,Mi was attracted to the craft and withoutdecided to leam from him."The craftsman said he couldn't4me when he saw that I had no fingers.I46and finallyregimen ()"'s like working out prevents high blood pressure and heart diseasewore him down,"Mi said6Emy Anall ain pychologist.Here rsom xe-ackdThe learning process was47 In the beginning he could only make two roses in an afternoonbegin.And his arms were often 48 after the practice.However,because of hisAnnoyed with a loved one?Practice the"self-reflection push-up."for the craft and his eagerness to earn a living,he never thought aboutMi has been makingimoyed or angryth somme else'sbehavior might refletthese clay figurines for 15 years.It nowhim only several minutes to make a figurine.After37halldggests practicing an exercise she calls the"self-reflection push-up."52elay into a ball with his elbows,Mi holds the ball between his arms to put it on a stick,and thenthe hch stand for0)血aos(装炉andto ude you.As冰yourfifadds smaller parts andto the ball.倦共4页第3页

life.She could tell deep down Miles was a good boy and always offered academic help whatev-er his attitudes.Later Mrs.Hall had to quit her job because of her illness.On her last day there,as shesaid goodbye to the kids,she saw Miles cry.Miles caught up as she left the classroom and said he would miss her.Mrs.Hall handed him a round brass coin and comforted him,"This penny will surelybring you luck.I know you're a good boy and I believe in you.If only you could focus on yourfuture,you would succeed in whatever you put your mind to."Miles choked up and lost forwords.After Mrs.Hall left the school,she lived in a small town.Her illness had eaten up herlife savings.She borrowed money from friends and family to pay for her treatment,and now,she was swimming in debt.One day,Mrs.Hall was at home when she heard a car sound in front of her house.Shelooked out the window to see a white car parked there.She then saw a man get out of thedriver's seat and start approaching her front door.She did not recognize him and wonderedwho he could be.A few seconds later,she heard a knock.She came to open the door."Hello,Mrs.Hall,I know you don't recognize me!"said the handsome young man.“To be honest,Idon't.Do I know you?”“You should！”He laughed..“It'sme！Miles！Remember your troublesome student atSpring Hill High School?"“What?Is that you?”Mrs.Hall stared at Miles.“You've grown so tall and..and..”“Handsome..?”They both laughed,and after the initial shock died,Mrs.Hall invited Miles into herhome.注意：1.续写词数应为150左右；2.请按如下格式在答题卡的相应位置作答。They sat for hours as Miles explained how he had turned over a new leaf after she left.Mrs.Hall was too excited to know what to say.【高三英语第10页（共10页）】·23-CM04C·

2022~2023学年度第二学期高二年级3月份月考英语考生注意：1.本试卷分选择题和非选择题两部分。满分150分，考试时间120分钟。2.答题前，考生务必用直径0.5毫米黑色墨水签字笔将密封线内项目填写清楚。3.考生作答时，请将答案答在答题卡上。选择题每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑；非选择题请用直径0.5毫米黑色墨水签字笔在答题卡上各题的答题区域内作答，超出答题区域书写的答案无效，在试题卷、草稿纸上作答无效。4.本卷命题范围：人教版选择性必修第三册Units1~3。第一部分听力（共两节，满分30分）第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。1.What does the woman suggest the man buy for his father?A.A wallet.B.A tie.C.A pen.2.Where does the conversation probably take place?A.In a shop.B.In a bank.C.At an airport.3.How much did breakfast use to cost?A.$2.B.$2.50.C.$3.4.Why does the man want to go to Los Angeles?A.To study.B.To go on a trip.C.To find a job.5.What does the man think of doing the survey?A.Easy.B.Unnecessary.C.Time-consuming.第二节（共15小题；每小题1.5分，满分22.5分)听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听第6段材料，回答第6、7题。6.What kind of room does the man want?A.A single room.B.A standard room.C.A double room.7.What is the probable relationship between the speakers?A.Mother and son.B.Husband and wife.C.Receptionist and guest.听第7段材料，回答第8至10题。8.What is the woman doing?A.Doing some shopping.B.Recommending a product.C.Checking the weather.9.What does the woman say about the smart speaker?A.It is unpopular.B.It is inconvenient.C.It is not always listening.【高二年级3月份月考·英语第1页（共8页）】232470Z

绝密★启用前所第6段材料，回答第6,7题。哪高三英语考试6.Where are the speakers?A.On a bus.B.In the hospital.(考试时间：120分钟试卷满分：150分)2.How long will it take the woman to get to the shopping center?C.In a supermarket.注意事项：A.About 15 minutes.1.答卷前，考生务必将自己的姓名、考生号、考场号和座位号填写在答题卡上。听第7段材料，回答第8,9题。B.About 20 minutes.C.About 35 minutes.2回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂What do weknow about the man?黑。如需改动，用橡皮擦干净后，再选涂其他答案标号。回答非选择题时，将答案写在A.He used to be a ski instuctor.答题卡上。写在本试卷上无效。B.Heused to sell the ship tickets.3.考试结束后，将本试卷和答题卡一并交回。C.He is too busy to ski any more.圜9.What does the woman want to do?第一部分听力（共两节，满分30分）A.Rent skis.B.Buy skis.C.Give up skiing.知做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。所第8段材料，回答第10至12题。第一节（共5小题；每小题1.5分，满分7.5分）10.What kind of weekend does themwan?听下面5段对话。每段对话后有一个小题，从题中所给的A,B、C三个选项中选出最佳选A.A busy city break.项。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读B.A relaxing time at the beach.一遍。C.A peaceful weekend in the countryside.例：How much is the shirt?11.Which hotel does the man prefer to stay at?A￡19.15.B.￡9.18.A.A hot spring hotel.C.￡9.15.答案是C。B.A family hotel on a farm.1.What does the man need to do first?C.A wooden hotel in the woods.A.Fix the shelf.B.Paint the car.C.Look for his keys.12.What's the name of the hotel the man will choose?2.Where does the conversation probably take place?A.Beach Hotel.B.Sunshine Spring.C.Farmhouse Gateways.A.At the bookstore.B.At the post office.C.At the hotel.听第9段材料，回答第13至16题。3.What is the probable relationship between the speakers?13.Why does Gloria look unhappy?A.Teacher and student.B.Colleagues.C.Schoolmates.A.She doesn't have a car.4.How does the woman feel?B.She couldn't get a ticket homeA.Pleased.B.Annoyed.C.Apologetic.C.She has been studying too much.5.What are the speakers mainly talking about?A.A famous TV program.4.What do the numbers on the boxes represent?A.Types of cars.B.Amounts of money.C.Distriets of France.B.The preparation for a speech room.C.The introduction to the guest speaker..What coor card does Gloria need?A.White.B.BlueC.Red.第二节（共15小题；每小题1.5分，满分22.5分）听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B,C三个选项6.Where is the ride board?中选出最佳选项。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各A.In the travel agent's office.小题将给出5秒钟的作答时间。每段对话或独白读两遍。B.In the cinema of the college.【高三英语第1页（共10页）】C.n the Student Union building.4001C·有听·4001C·有听·【高三英语第2页（共10页）】

本文是记叙文。一对夫妇在翻新厨房时发现罕见金币，拍卖价超过80万美元，这些金币具有极高的历史价值。24.B。理解具体信息。根据第一段中的found264 gold coins during home improvements和第二段的内容可知，这对夫妇翻新房子时在厨房的地板下意外发现了一个杯子，里面装满了金币。25.D。推断。根据第四段中Edmund所说的It isn't often an auctioneer is given the pleasure ofconducting a white glove sale(100%sold)可知，这次拍卖会取得圆满成功，Edmund觉得自己能参与这样的拍卖很幸运。white glove sale指的是整场拍卖的每一件拍品都卖出。26.C。理解词汇。根据本段中的According to the auction house,the coins would be valued atabout $113,010 and could be sold at auction for S250,000.To the couple's surprise,however forS852,380和The price increased可知，据拍卖行所说，这些金币预估价为大约113,010美元，也许能卖到250,000美元。但最后的结果令人很意外，金币的价格大涨，这说明它们最终被卖到852,380美元。flogged在此意为“卖”。27.B。理解具体信息。根据最后一段的内容可知，这两枚金币都有铸造错误，一枚正反两面图案相同，都是反面图案，另一枚有一处拼写错误。正因为它们独特的错误，买家对它们非常关注。C篇主题语境：人与自我一一生活与学本文是新闻报道。由于学生家长的投诉，Gilbert镇计划在Robert Rice小学前设立学校区域。28.A。推断。第二段中两位家长说明了Robert Rice小学前车辆高速行驶的情况，第三段中家长们向ABC15表达了他们的期望，他们希望设立学校区域标志和较低的速度限制。由此推断，家长们如此建议，是因为他们担忧孩子的安全。29.D。理解具体信息。根据第四段中的The school was built in020 and is part of the ChandlerUnified School District(CUsD),but it has a Gilbert address和第五段中的Chandler'scommunications staff said ..the area directly in front of the school would be in Gilbert townlimits可知，Robert Rice小学同属Chandler联合学区和Gilbert镇管辖。30.B。理解具体信息。根据第六段中的Gilbert's communications team said there wereintermittent construction zone projects.there was a delay with the second可知，Gilbert镇的工作人员说，建设学校区域的施工断断续续，因延误没有完成，这导致该区域的限速标准一直没有改换。31.C。理解主旨要义。本文的大意是：在学生家长投诉后，经过ABcl5、Chandler联合学区和Gilbert镇的协调努力，Gilbert镇计划在Robert Rice小学前设立学校区域。故C项最能表达文章主旨。D篇主题语境：人与社会一一科学与技术本文是新闻报道。科学家创造出可添加到食物中，提升纤维含量的新产品FiberX。32.D。理解具体信息。根据第二段中的We can now add extra fiber to foods without changingthe taste,which has been one of the main issues with most fiber supplements to date可知，现在市场上大多数纤维产品的一个主要问题是会改变食物的味道。33.B。理解具体信息。根据第四段中的内容可知，在不影响食物味道和口感的前提下，FbrX可增加高达20%的纤维，这是一个非常重要的改进。34.A。理解具体信息。根据第七段的内容可知，研究人员说，生产植物蛋白所产生的大量废料可以做成干淀粉，然后再加工成FiberX,这说明FiberX是一种环保产品。35.B。理解观点、态度。根据最后一段中Farahnaky所说的内容可知，他认为即便我们吃少

2022~2023学年高一年级教学诊断性考试英语（北师大版）参考答案第一部分听力pictures”以及下文的“to map which parts of the1-5 CABCB 6-10 CAABBriver were the most polluted'”可知，“我”拍下11-15 BACAC 16-20 CBBAB照片是为了绘制地图，标识出河流的哪片区域污第二部分阅读染最严重。由此可推知，geotagged与绘制地图第一节有关，表示对垃圾多的地方进行标记。marked表示“做记号”，意思与之最相近。故选C。【语篇导读】本文是一篇应用文。文章主要介绍了四27.D推理判断题。根据第四段中的“We need to本与营地有关的小说。target the root cause:the buying of plastic.21.A细节理解题。根据文章中关于第三本书的介知，作者认为，塑料垃圾多的根源是人们购买塑绍“Illustration(插图)novel Flamer.”可知，料制品。由此可推知，在作者看来，少购买塑料这本书是一本插图小说，因此适合喜欢图画书的制品对减少塑料污染很重要。故选D。读者。故选A。C22.C细节理解题。比较四本书的价格可知，最后【语篇导读】本文是一篇说明文。文章主要介绍了秋一本书价格为18美元，是四本书中最贵的，其天树叶的颜色发生变化的科学道理。作者是Emma Lord。故选C。28.C推理判断题。根据文章第一段中的“This23.D细节理解题。根据第一本书中提到的seasonal change has inspired many artists to create“Emma's invited back to camp to be the new.”,amazing poetry,such as.”可知，作者提到第二本书中提到的“many of Bridget's chaptersRobert Frost就是为了证明秋天给诗人带来灵take place while she attends a soccer camp'”,第三感。故选C。本书中提到的“Flamer follows Aiden Navarro29.B段落大意题。根据第二段中的第一句“In thethrough the summer camp”以及第四本书中提到spring and summer,tree leaves produce a的“Abby finds herself at a summer camp withchemical called chlorophyll(叶绿素)，which isSavvy'”可知，这四本书中的故事都和camp有一responsible for the green color,.”可知，本段主要定的关系。故选D。介绍树叶颜色的由来。故选B。B30.D细节理解题。根据文章第三段的前两句可知，【语篇导读】本文是一篇记叙文。文章讲述了2015随着季节开始变化，白昼变短，温度降低，导致年，“我”决定休假去旅行，途中看到海洋上漂浮着树木停止生产其生存所需的糖分。因此，叶绿素很多塑料垃圾，于是开始骑着自己的竹制自行车在泰及其绿色色素开始消失，导致树叶呈现出明亮的晤士河上捡塑料垃圾，保护环境的故事。秋天色彩。根据第二句可知，直接引起树叶呈现24.B细节理解题。根据第一段中的“to float on明亮的秋天色彩的原因是叶绿素及色素的消失。the Thames”可知，竹子做的自行车可以漂浮在不能选B项“温度的巨大变化”。文章中说的是水上。故选B。温度降低，且温度变化只是树叶颜色发生变化的25.A细节理解题。根据第二段中的“This is it-诱因，而不是直接因素，直接因素还是树叶里面the project is over!”可知，竹自行车翻车的时的化学物质，即叶绿素和色素的消失。故选D。候，作者认为这个项目失败了。故选A。31.A文章标题题。本文主要介绍了秋天树叶的颜26.C词义猜测题。根据画线词前的“took色发生变化的科学道理。故选A。·英语（北师大版）参考答案（第1页，共7页）·

can注意：1.写作词数应为80左右；aenbicto2.可以适当增加细节，以使行文连贯。CaHealth in Winterwith,brethi.theStrength第二节（满分25分）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。Jessica and Cayla were two sisters,who loved each other very much.They were not onlysisters,but they were best friends,too.They liked to eat,play,go to school and do everythingtogether.Nothing could break them apart!One day,there was a running race competition at school.Both Jessica and Cayla were very fastrunners and they were sure they would win if they signed up for it.They were very excited toparticipate together.And there were other friends too,who were all going to run.The judge blew the whistle...toooot!!Everyone started running.Jessica and Cayla wererunning as fast as they could.They were running so fast that they passed everyone in a very shorttime.The audience was cheering,"Look at the sisters.They are so fast,like lightening!"Hearingthe cheers,they ran even faster.They barely looked at each other.Suddenly Cayla hit a stone on the race track.She got hurt and fell down,with her legbleeding.She called Jessica to stop and give her a hand.She groaned (with pain.But Jesstcawouldn't stop or look.She guessed that Cayla just had a slight fall.She had gnly one thought onnd hasaher mind.She had to win this race!Jessica reached the finish line first.The judge announced,"You are the first,Jessica!"But,'s heads.there was no applause from the crowd.Jessica was surprised.She had won but no one was clappingLanzhoufor her.She turned back to see if her sister Cayla was close behind her.But she was not there!Jessica was worried that something bad had happened.In one ofJessica started running back.Soon she reached the spot where Cayla was lying injured.Jessicat.Cavishfelt awful.She was not there for her sister when she needed her the most.there are注意：decades.1,续写词数应为150词左右；(found),2.请按下面格式在答题卡相应位置作答。industry.handful ofFeeling guilty for her behavior,Jessica sat down to check Cayla's injury.enever youil to hit theWhen both the sisters reached the finish line,they hugged.英语第8页（共8页）

参考答案学生用书考点集训（四）A组题≥音+片×√合·9=是，1.A解析]由a>b>0得，a2+b2>2ab;但由a2+b2>2ab不能得到当且仅当2a=6=4时，等号成立.。>b>0,教a>b>0是ab生的完分不必要条件，故造A此时满足在x=1处有极值，2.C[解析]因为x≠0，所以x2>0,“合+合的最小值等于受2.-12[解析]a2a5a8=-8,a3=-8,∴a5=-2,因为)=32+是≥26（当且仅当3x2=是等号成立，∴.a10，当且仅当一ag=一9a1时取等号.由v瓜=日+名≥√日x名=2√需，3.号[解析]AB,C为△ABC的三内角，A为税角，amB=2anA>0,所以ab>2√2（当且仅当b=2a时取等号），..tan B=2tan[n-(B+C)]=-2tan(B+C),所以ab的最小值为2√厄.4.A[解析]因为对任意a,b∈R,有a2十b≥2ab,故有amB-2h把9，即可得amC裙品tan2B-2而对任意a,b∈R,a2十b2≥kab,所以-2≤k≤2，1d6+言2-g+因为[-2,2]是(-∞，2]的真子集，“amB+tan Ctan B3tanB所以“对任意a,b∈R,a2十b2≥kab”是“k≤2”的充分不必要条件.5.C[解析]因为x,y属于正实数，≥2V受6号，当且仅当tanB=1时等号成立，所以不等式兰+号>恒成立，小anB十aC曲最小值为导即m0.1.C[解析]原不等式可化为4x2-12.x+9≤0，即(2x-3)2≤0，“日+合=（合+台）a+)=名+日{合+把)2x-3=0=是623