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2017年中考完型填空专题复习

完形填空答题技巧(上下文+逻辑+固定搭配+语法+背景知识)

完形填空题篇幅一般150~250个词, 以故事性题材居多, 体裁以记叙文或夹叙夹议文为主。多数完形填空设10空或15空, 考点主要涉及词汇、语法及对短文内容的理解。近几年中考完形填空的命题有以下趋势: 1. 在命题角度上体现“突出语篇”的命题原则, 即“突出语意填空, 削减语法填空, 以考查理解能力为主”; 2. 在题材上将更加贴近学生、贴近生活、内容新颖, 富有时代气息。

一．完型填空试题主要特点：

1. 文章中设空15个.首句不挖空；

从历年的试题可以看出，完形填空所采用的短文一般不给标题，且首句往往不设空，通常是个完整的句子。这个句子往往是全文的关键句，它是了解全文的窗口，常常包含对解题有用的信息，因此要注重细读首句，并据此来判断文章的体裁，题材，推测全文的主旨和大意，推断故事发生的人物、地点、时间、气氛等多方面的特征，争取开局顺利。

2. 干扰项设计严密.一般情况下，选项的词性相同或属于同等或对等范畴，干扰项填入后在语法上一般不存在错误，对考生有很大的迷惑作用；

3.突出语篇(语境)，强调应用，注重交际；

4.大多富有积极的教育意义，给人以人生的启迪或是充满了生活情趣；

二．完型填空考查内容

1、context（上下文、语境）

2、logic（逻辑）

3、regular collocation（固定搭配）

4、grammar analysis（语法分析）

5、background knowledge（背景知识）

三．完形填空的解题总则 ------- 把握整体具体分析

四．完形填空的解题步骤

(1)利用首句提示（2）在掌握文章大意、弄清作者意图的基础上，根据标志性词汇或句子，推断该语境的未知信息（3）应特别注意空格前后所出现的相关词语，尤其注意找出其中重复出现的暗示性词语。(4)最后，全面复核检查，合理修正答案。借助补全

的空缺，再次细读全文，反复斟酌。两忌讳：忌把完形填空当单项选择（答案不仅要在原句中合理，也要在全文中合理，要有全局观。）；忌忽略语境。

跳过空格，通读全文，掌握大意 =2min

瞻前顾后，先易后难，个个击破 =10min

再读全文，反复检查，验证答案 =2min

五．完型填空解题口诀：

把握全文明主线，固定搭配记心间，原词再现莫错过，上下求索是关键。

六．完形填空的解题方法

1.充分利用文章的上下文和前后句，找到对选择有提示作用的词或句。这些词有时可能是同义词或反义词。注意上下文语境

2. 注意固定的搭配，包括动词与介词的搭配、动词与名词的搭配以及形容词与名词的搭配等，同时要根据内容选择正确的短语。掌握习惯搭配

3. 注意同义词的辨义运用词义辨析

４.根据动作的发出者确定所选的词

5. 根据上下文的逻辑关系确定选项运用逻辑分析

6.根据生活常识以及相关知识确定选项了解常识背景

7 . 根据作者的态度，观点，情绪来确定相关选项

+运用语法分析运用排除法

为什么我们在这一题型上总是失分较多?

1.没有严格遵循答题步骤:很多考生一拿到完形填空题就急于选择答案，不认真分析通篇文章，单纯求快，忽略语篇理解，只看局部的词义辨析、搭配和语法结构。表面上解题速度挺快，但是这种见树不见林的做法只会影响解题的质量和效率。

切记:一定要用2-3分钟时间先进行缺词阅读,弄清文章大意和基本脉络后再着手逐个填空.

2.不注意积累答题技巧:

a.忽略文章首句的提示作用；

b.忽略文章中上下文之间的照应关系;

c.遇到长句不注意分析句子结构,在语义模糊时抱碰运气的心理随意作出选择.

3.时间安排不当:在几个选项上过分纠缠，追求完美，导致许多本可以做出的题来不及做。

切记:正确的做法是由易到难，先做会做的，再考虑较难的。

强烈推荐：如尚有几题题目不确定可将某题的可能的两项填入空格, 然后快速地整句整段地默读, 选择某一项习惯或短语或动宾搭配读起来较流畅的.

Tips to Close Test:

1．注重首、尾句。

2．克服畏难、急躁情绪,耐心通读全文。

3．切勿看到一个空格就急着选出一个答案，必须纵观全文、通篇考虑。

4．动笔时先易后难,注意从文中同样结构或类似结构中寻找提示，大胆地作出猜测。5．如果选项从语法角度无法确定，则必须从语篇(前提示、后暗示)意义上加以鉴别。2016真题

完形填空（每小题1分，共10分）

阅读下面短文，掌握其大意，然后从每小题所给的A、B、C三个选项中，选出一个最佳选项，并在答题卡上将该项涂黑。

The world needs love and many people need our help. Several years ago, my teachers asked me to take part in a program that helps those who are 31. Each week, I spend an hour in the classroom helping with schoolwork, art project, games and other 32, including eating. My mother is a teacher, so I am used to helping children; however, I found that working with children with special needs would 33 my life forever.

At first, I thought it would be 34 to be with the children who are so different, but gradually I found there's something special about these students. So there was no need to worry about it. Each Thursday I was welcomed by the smiling faces of Thomas,Joey and Missy. Thomas has to sit on the wheelchair. He communicates with simple words 35 yes or no.Joey, a deaf girl, always welcomed me with a big smile. Missy was born with a kind of 36 and it makes her really small for her age. In a normal

classroom, it would be common to hear a teacher comfort a child who is tapping his pencil, speaking 37 or making unnecessary noises. However, here, shouts, cries, and other noises are 38 ．They're signs of excitement and different ways of communicating. Working with children with special needs has changed my life. It has made me 39 others'needs. One of my

teachers believes that we should be part of something bigger than 40 . I never realized how true this was until I worked with these children. I believe everyone should get out and do something that makes a difference. 31．A．uneducated B．homeless C．disabled 32．A．courses B．competitions C．activities 33．A．change B．waste C．save

34．A．nervous B．relaxing C．lively

35．A．except B．like C．against

36．A．ability B．illness C．habit

37．A．clearly B．politely C．loudly

38．A．mentioned B．stopped C．encouraged 39．A．refuse B．notice C．influence 40．A．ourselves B．yourselves C．themselves．

2015真题

二、完形填空

Yesterday is Father's Day. Many things happening between my father and me crowded my mind. But one thing made a deep impression on me.

It was a Sunday morning, and I was in a 16 mood(情绪). Two of my friends had gone to the movies the night before and hadn't invited me. I was in my room 17 ways to make them sorry when my father came in. "Want to go for a ride today, Beck? It's a beautiful day."

"No! Leave me alone!" Those were the 18 words I said to him that morning.

My friends called and 19 me to go to the mall with them a few hours later. I forgot to be 20 with them and then went with them. When I came home, I found a 21 on the table. My mother put it where I would

be sure to see it. "Dad has had an 22 . Please meet us at Highland Park Hospital."

When I reached the hospital, my mother came out and told me a car hit

my father and his injuries were extensive(大面积的). "Your father told the driver to leave 23 alone and just call 911, thank God! If he had moved daddy…"

My mother may have said more, but I didn't hear. I didn't hear anything

24 those terrible words: Leave me alone. My dad said them in order to

25 himself. He didn't want to be hurt more. How much had I hurt him

26 I shouted out those words at him earlier in the day?

It was several days later that he was 27 able to have a talk. I held his hand gently, afraid of hurting him.

"Daddy…I am so sorry…"

"It's okay, sweetheart. I'll be okay."

"No," I said, "I mean about 28 I said to you that day. You know, that morning?"

He looked at me and said, "Sweetheart, I remember 29 about that day, not before, during or after the accident. I remember telling you goodnight

the night before, though." He managed a weak smile.

My English teacher once told me that words have great power. They can hurt or they can heal(治愈). And we all have the power to 30 our words. I

am going to do that very carefully from now on.

16. A. good B. terrible C. peaceful

17. A. thinking up B. giving up C. looking up

18. A. common B. last C. careless

19. A. led B. encouraged C. invited

20. A. strict B. angry C. pleased

21. A. letter B. diary C. note

22. A. accident B. illness C. examination

23. A. me B. him C. her

24. A. except B. among C. towards

25. A. hide B. save C. express

26. A. when B. until C. before

27. A. really B. finally C. suddenly

28. A. how B. why C. what

29. A. something B. everything C. nothing

30. A. keep B. choose C. understand

2014

Each of us fails from time to time . If we are wise, having enough experience and knowledge, we regard these failures(失败) as a necessary and 31 part of learning. But often as parents and teachers, we

don't 32 this right(权利) to our children.

Donnie was a third grader in my class. His 33 about failure kept him from classroom games that other children enjoyed. He 34 answered my questions — he was afraid of making mistakes.

I tried my best to build his self-confidence. But nothing

changed 35 midterm, when Mary, a new teacher, came. She was young and pretty, and she was loved by every student36 Donnie. It was her who made a big difference to Donnie later.

One morning , they were doing math problems at the blackboard. Donnie had copied the problems clearly and 37 . But he'd missed the fourth problems and began to cry with his head in his arms.

I didn't know what to do. Suddenly, a smile 38 on Mary's face . From the desk she got a box 39 pencil. "Look, Donnie," she said gently, kneeling(蹲在)beside him. "I've got something to 40 you." She remove the pencils, one at a time, and placed them on his desk.

"See these pencils, Donnie," she continued. " They 41 Mrs Landon and me. See how the erasers are worn(磨损)？That's because we make mistakes too. But we erase the mistakes and try again. That's what

you 42 learn to do , too."

She kissed him and stood up, "Here," she said, I'll leave one of these pencils on 43desk, so you'll remember that everybody makes mistakes, even teachers." Donnie looked up with 44 in his eyes and a smile.

The pencil became Donnie's prize. That , together with Mary's encouragement, gradually made him understand 45 the meaning of making mistakes is — it's all right to make mistakes, as long as you erase them and try again.

( )31. A. similar B. active C. important

( )32. A. offer B. pass C. send

( )33. A. puzzle B. worry C. complaint

( )34. A. always B. usually C. seldom

( )35. A. since B. after C. until

( )36. A. including B. except C. without

( )37. A. simply B. carefully C. casually

( )38. A. Appeared B. froze C. disappeared

( )39. A. made of B. covered by C. filled with

( )40. A. tell B. show C.ask

( )41. https://www.wendangku.net/doc/2b4983491.html,e to B. refer to C. belong to

( )42. A. might B. could C. must

( )43. A. your B. his C. her

( )44. A. hate B. love C. fear

( )45. A. how B. why C. what

2013

When I was a young child, my parents often told me that it was time that t aught a man everything. I didn’t understand and wondered why _31_ had such a big influence _32_ a person. I thought I could grow up quickly to fi nd it out as an adult. But now, _33_ I come to knock at the door of adultho od, I feel _34_ to express my own opinion on this saying. I know that I am just a high school student with very few experiences. There are still many things waiting for me in the future, yet I would like to express myself in a childish voice.

I once read this sentence, “To make this world a happy place in which to live, you had better _35_ yourself and your heart, instead of the whole world.” I was shocked. It made me think about _36_ itself. There are so m any things around us that _37_ our will. We can’t force life to follow our wi shes. The earth won’t stop turning no matter whether we _38_ it or not . What we can do is just to make _39_ suit the world. I think we should lea rn to accept _40_ life gives us, no matter whether it’s the spring sunlight o r the winter snowfall, and try to be happy.

The pop song Grandmother by Jay Chou is my favorite. I’

m deeply moved by this beautiful song. I always try to _41_ every pleasan t thing in my life, but now I see that I don’

t catch most of the pleasant moments. It is more likely that they slip by （流逝）and leave you _42_ regretful. I realize that I’

m not just living for myself and that there are others I should _43_ such as my parents, friends, and so on. They all pay attention to my growing up, _ 44_ it’s just a little progress.

Everyone has his or her own _45_ towards life, positive or negative. It do esn’t matter, I think. There is one rule that should be obeyed and that’s to make this world better.

31. A. man B. time C. thing D. parent

32. A. about B. with C. on D. in

33. A. before B. after C. as D. when

34. A. glad B. angry C. tired D. anxious

35. A. praise B. change C. exchange D. force

36. A. life B. money C. heart D. world

37. A. go with B. go along C. go for D. go against

38. A. receive B. check C. refuse D. accept

39. A. himself B. themselves C. ourselves D. yourself

40. A. what B. that C. which D. why

41. A. touch B. escape C. catch D. lose

42. A. feeling B. looking C. remaining D. proving

43. A. make of B. speak of C. hear of D. think of

44. A. in case B. in that C. even if D. as if

45. A. idea B. way C. view D. attitude

2012

When I was in primary school, I had a big argument with a boy in my class. l can't 31 what it was about, but I have never forgotten the 32 I learned that day.

I was sure that I was right and he was wrong. 33 , he strongly believed that I was wrong and he was right. The teacher decided to teach us a lesson. She 34 a good idea. She brought both of us to the front of the class and placed him on one side of her grey desk and me on 35 . In the middle of the desk was a large, round object. It was 36 for me to see that it was black. She asked the boy what color the object was. " 37," he answered in a loud voice.

I couldn't 38 that the object was whites, considering that it was certainly black! One more argument started between the boy and me, this time 39 the color of the object.

The teacher told me to go stand where the boy was standing and told him to come stand where I had been. We changed 40 , and then she asked me what the color of the object was. I 41 answer, "White. " It was then that I knew what was wrong. It was an object with two 42 colored sides, and from his side it was white. 43 from my side was it black.

My teacher taught me a very important lesson that day: You must 44 in other person's position (位置) and look at the 45 through their eyes in order to truly understand their ideas.

31.A. understand B. remember C. explain

32.A. class B. subject C. lesson

33.A. Therefore B. Also C. However

34.A. came up with B. went on with C. got along with

35.A. another B. other C. the other

36.A. hard B. clear C. lucky

37.A. Black B. White C. Grey

38.A. realize B. describe C. believe

39.A. like B. against C. about

40.A. places B. objects C. opinions

41.A. could B. should C. had to

42.A. similarly B. differently C. brightly

43.A, But B. Still C..Only

44.A. appear B. stand C, hide

45.A. situation B. discussion C. solution

2011

One summer day when I was in high school, my father sent me to buy some tools for our farm. I loved __31__ better than driving our family truck to do something. But this time I was not so happy __32__ my father had told me I would have to ask for credit (赊账)at the store.

__33__ is a proud age. The young men at that age want respect (尊重)but not charity. I had seen many times that my friends were __34__ when they asked for credit. We lived in a poor village, __35__ was needed seriously. I knew clearly how difficult it might be to make the store owner believe me and get the credit.

At David’s Brothers store, Buck David was talking to a farmer. After I finished __36__ the things I w anted, I walked to him. “I need to put these on credit.” I said to him __37__.

The farmer gave me a __38__ look. But Buck’s face didn’t change in the slightest. “ No problem.” He said in a relaxing voice, “ I believe your daddy will __39__ them in time.” Then he turned to the farmer, “ This boy is Jame William’s son.”

The farmer nodded to me in a friendly way. At that time, I __40__ pride. Jame William’s Son, there three __41__ opened a door to an adult’s respect and trust.

That day I __42__ that a good name of great importance. My father’s good name had won our neighbors’ respect for our family. A good name,

and the responsibility (责任)that came with __43__ encouraged us a lot. They made us be __44__than we might be. We also wanted to be regarded as good people. __45__ acting like good people for a long time, we became good out of good habits.

31. A. something B. anything C. nothing

32. A. because B. while C. unless

33. A. Six B. Sixteen C. Sixty

34. A. influenced B. cheered C. refused

35. A. health B. money C. freedom

36. A. choose B. choosing C. to choose

37. A. carefully B. angrily C. easily

38. A. pleasant B. kind C. strange

39. A. care for B. pay for C. look for

40. A. was full of B. was surprised at C. was famous for

41. A. letters B. words C. sentences

42. A. discover B. discovered C. have discovered

43. A. it B. him C. them

44. A. Better B. stronger C. clever

45. A. With B. For C. By

2017年新目标初中英语中考总复习

九年级英语新目标七年级英语(上)期末复习手册 Unit1-12重点知识梳理 Unit 1 ?句子: 1、初次见面用语课P 2、 2C 2、问xx号码 What’s your name? My name is …/ I’m… What’s your phone number? Nice to meet you ! : What’s his/her phone number? It’s 3272310、 ?词汇:1、family name, first name, last name ?语法:1、形容词性物主代词得用法 2、人称代词主格得用法3、基数词:1至10得读法与写法 Unit 2 ?句子 1、Is this / that your pencil? Yes, it is、No, it isn’t、 2、 What’s this in English? It’s a pen/ ruler/ book…、How do you spell pen/ ruler/book? P-E-N、 ?核心知识1、认识26个字母,辅音字母,元音字母2、认识一般疑问句得句式 ?写作:课P11、3a Found and Lost Unit 3 ?句子:1、介绍别人或某物This is …That is …These are …Those are … ?词汇:课P13 1a ?写作:1、学习英语信得格式2、课P17 以信得形式介绍相片中人物 Unit 4 ?句子询问地方Where is / are …？It’s …/ They are … ?核心知识1、词汇课P24 1 2、 take 与bring 得区别 3、 there be 得用法4、 on the wall 5、介词:on , in , under , behind , next to , between…and… 6、认识特殊疑问句得句式 ?熟读:P23、3a , P24、 3 , Grammar Focus Unit 5 ?句子 1、 Do you have …？ Yes, I do、 No, I don’t、 2、 Does he / she have …? Yes, he / she does、 No, he / she doesn’t、 3、 Let’s … 4、 That sounds good / interesting、 That’s a good idea、 5、 Wele to … ?核心知识一、there be 与have 得区别

初中英语完形填空解题技巧讲课讲稿

初中英语完形填空解题技巧

初中英语完形填空解题策略一、完型填空之概述分析 “完型填空”是初中英语必考的一道题型。完型填空通常是同学们较难把握的题型之一，且失分率较高。它是对学生阅读能力，语法知识，逻辑推理以及分析归纳等综合能力的考查。因此，要做好完型填空，不仅要具备一定的词法、句法和惯用法等语法知识，而且还要具备阅读理解能力、综合分析能力和运用语言知识的实践能力。中考完型填空从基本设计上来看，原则都是一致的，都是从短文中抽去若干词，让考生根据上下文填入适当的词，为了有助于考生填入适当的词，可以提供四个答案(其中包括一个正确答案)，让考生选出正确的答案；“抽词法”可以是有针对性地抽，也可以是随机地抽。但目前主要考查的是学生在具体语言环境中对文章的篇章结构、中心思想、推理判断、词语辨析、习惯用法、固定搭配等方面的能力要求，及对所学英语的综合运用能力、快速阅读理解能力及逻辑推理判断能力等，而不是单纯对语法结构的考查。二、完型填空之命题趋势剖析完型填空要求考生不仅要会运用自己学过的词汇和语法知识妥善地处理好每个单句，理解语义，还要处理好单句之间以及单句完形填空题要求填入的词主要有：构成各种时态和用法区别的动词及短语动词；名词和介词；根据上下文意思及结构必须填入的形容

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雄的人民军队开始诞生。这次事件是 A．五四运动B．北伐战争C．南昌起义D．秋收起义 5.九一八事变后，《生活画报》刊载了《东北义勇军喋血苦战情形》和《沦亡一年后东北情况》等图片，真实记录了日军的侵华暴行和东北军民的英勇抗战。这反映了 A．日军侵华蓄谋已久B．日本是最早建立法西斯政权的国家 C．全面抗战已经开始D．中国是最早反抗法西斯侵略的国家 6.1953年是中国经济史上一个重要分水岭，从那时起，中国人熟悉了一个经济术语：“五年计划”。以下属于“一五计划”成就的是 ①长春第一汽车制造厂建成②修建青藏、新藏等公路 ③农村的乡镇企业发展迅速④武汉长江大桥建成通车 A．①②③B．①②④C．②③④D．①③④ 7．科学引领未来。最早提出图2原理的科学家是 A．阿基米德B．瓦特C．牛顿D．爱迪生 8．傅雷评价《蒙娜丽莎》时说：“吸引你的，就是这神秘。因为她的美貌，你永远忘不掉她的面容，于是你就仿佛在听一曲神妙的音乐，对象的表情和含义，完全跟了你的情绪而转移。”这说明该画作体现的主要精神是 A．现实主义B．人文主义C．浪漫主义D．蒙昧主义 9．“大多数德国人相信，战争在圣诞节前就会结束。但由于机枪、毒气、坦克在战争中相继应用，因此战争远没有人们预计的那样顺利。至年底，德国在东西两线都陷入焦灼对峙的状态。”这段文字描写的是A．普法战争B．八国联军侵华战争C．第一次世界大战D．第二次世界大战 10．论从史出、史论结合是学习历史的重要方法。下列史实与结论能够成立的是史实结论 A 欧洲人称0—9十个数字为阿拉伯数字数字是由阿拉伯人发明的 B 苏俄实行新经济政策征收粮食税苏俄实行的是农民土地私有制

广东省2017年中考历史试题(含答案)

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5.考生务必保持答题卡的整洁。考试结束时，将试卷和答题卡一并交回。一、单项选择题（本大题共25小题，每小题3分，共75分。在每小题列出的四个选项中，只有一项是正确的，请将答题卡上对应题目所选的选项涂黑）1．题1图的考古发现，为距今六七千年我国原始居民使用的生产工具。从生产力发展的水平来看，此类工具的出现和使用佐证他们生活在 A．旧石器时代 B．新石器时代 C．青铜朝代题1—1图石斧题1—2图骨耜（复原图）D．铁器时代 2．如果诸侯不履行自己的义务，或超越周王赋予他们的特权，周王可以废除给他们的封地和爵禄，甚至消灭他们。以上解读源于 A．禅让制 B、世袭制 C．宗法制 D分封制

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2017年中考英语二轮语法感叹句专题复习材料

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四、how引导的感叹句： 1.How+adj/adv+主语+谓语！_________hardtheyareworking! 2.How+adj+a/an+单数名词（+主语+谓语）！Howtallaboyheis! 3.How+adj/adv+the+名词+谓语！________heavilytherainisfalling! 五、what与how引导的感叹句之间的转换： 1.Whatabeautifulgirlsheis!=______beautifulthegirlis! 2.Howdeliciousthefoodis!=______deliciousfooditis! 六、几个常见的感叹句： 1.______greatfunitis! 2.______importantinformation! 3.______goodnews! 4.______goodadvice/music! 5.______aheavyrain! 6.______astrongwind! 七、感叹句中常见的不可数名词： food,work,weather,fun,music,information,news,advice 练习与巩固：熟能生巧，取得好成绩！ ()1._______acleverboyheis! A.What B.How C.What’s ()2._______shedances! A.Howgood B.Howwell C.Whatwell ()3._______quiettheparkis! A.Whata B.How C.Howa ()4._____hisfatherworks!

《圆》中考试题精选(1)

2017《圆》中考试题精选（1） 1、（17西宁）如图，AB 是⊙O 的直径，弦CD 交AB 于点P ，AP=2，BP=6，∠APC=30°，则CD 的长为_________ 2、（17贵港）如图，A，B，C，D 是⊙O 上的四个点，B 是的中点，M 是半径OD 上任意一点．若∠BDC=40°，则∠AMB 的度数不可能是（） A ．45° B ．60° C ．75° D ．85° 3、（2017潍坊）点C 、A 为半径是3的圆周上两点，点B 为弧CA 的中点，以线段BA 、BC 为邻边作菱形ABCD,顶点D 恰在该圆直径的三等分点上，则该菱形的边长为____________ 4、（陕西）如图，△ABC 是⊙O 的内接三角形，∠C=30°，⊙O 的半径为5，若点P 是⊙O 上的一点，在△ABP 中，PB=AB ，则PA 的长为_________ 5、（贺州）如图，在⊙O 中，AB 是⊙O 的直径，AB=10，弧AC=弧CD=弧DB ，E 是点D 关于AB 的对称点，M 是AB 上的一动点，下列结论：①∠BOE=60°；②∠CED= 2 1∠DOB ；③DM ⊥CE ；④CM+DM 的最小值是10，上述结论中正确的是_______6、（南京）如图，四边形ABCD 是菱形，⊙O 经过点A、C、D，与BC 相交于点E，连接AC、AE．若∠D=78°，则∠EAC=_________ 7、（盐城）如图，将⊙O 沿弦AB 折叠，点C 在弧AmB 上，点D 在弧AB 上，若∠ACB=70°，则∠ADB=_________ 8、（株洲）如图，已知AM 为⊙O 的直径，直线BC 经过点M，且AB=AC，∠BAM=∠CAM，线段AB 和AC 分别交⊙O 于点D、E，∠BMD=40°，∠EOM=________ 9、（海南）如图，AB 是⊙O 的弦，AB=5，点C 是⊙O 上的一个动点，且∠ACB=45°，若点M、N 分别是AB、AC 的中点，则MN 长的最大值是_________ 10、（17西宁）如图，在△ABC 中，AB=AC，以AB 为直径作⊙O 交BC 于点D，过点D 作⊙O 的切线DE 交AC 于点E，交AB 延长线于点F．（1）求证：DE⊥AC；（2）若AB=10，AE=8，求BF 的长．