选择填空(一)
人教版英语七年级上册Unit2测试试卷(含答案)(1)
人教版英语7年级上册Unit 2·一、选择填空（15小题，每小题1分，共15分）从A、B、C、D四个选项中选出一个最佳答案。
1．—________ he?—He is my friend.A．What’s B．Who’s C．Who are D．How’s 2．________ is my sister. ________ are my parents.A．These; Those B．These; This C．This; That D．This; These 3．________ is my brother and ________ are my sisters.A．Its; these B．This; those C．This; that D．These; those 4．Your brother is your mother’s ________.A．cousin B．son C．father D．uncle 5．His father’s sister is his ________.A．mother B．daughter C．aunt D．grandmother 6．—Where ________ my pictures?—________ are in your bag.A．is; These B．are; They C．are; Those7．________ is not my sister. She’s my cousin.A．This B．These C．Those8．________ her four friends.A．This is B．These are C．Are these D．That is 9．This ________ a cup and these ________ maps.A．is; is B．are; are C．is; are D．are; is 10．—________ these your keys?—Yes, they are.A．Are B．Am C．Is11．—Mary, what ________ that in English?—It is a pen.A．are B．am C．is12．—What ________ those?—They are my books.A．are B．am C．is13．________ is a picture of her room(房间).A．This B．Those C．These14．—Are these your uncle and aunt?—Yes, ________.A．these are B．it is C．this is D．they are 15．Can you see the boys over there? ________ are my brothers. Let’s go and say hello to them.A．This B．Those C．That D．These二、完形填空（10小题，每小题1分，共10分）先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案。
国开（电大）专科《人文英语1》网上形考试题及答案
国开（电大）专科《人文英语1》网上形考试题及答案一、选择填空题目1—Hi, Wang Xin，nice to meet you!—Hi, Liu Hui, _____________________选择一项：A. nice to meet you too.B. how do you do?C. I'm fine, thank you.题目2—Hi! How are you doing?选择一项：A. That's all rightB. How are you doing?C. I'm doing well.题目3Bai Mei don't know Liu Hui, so Zhuang Hua _________ her to Liu Hui.选择一项：A. introduceB. speakC. talk题目4When you feel _________, you should go to see a doctor.选择一项：A. sickB. safeC. Sad题目5People can't live without____________ sun.选择一项：A. aB. anC. the题目6二、阅读理解：完形填空题（每空10分）操作提示：通过题目中的下拉选项框选择恰当的词语补全填空。
Social work helps people to have a B life. In many cases this requires the social worker to help people to overcome the negatives in their lives. Social work includes from helping a Ato get into college to counseling a person with illness. In most cases the role of a social worker is to help people to C the skills.Most of the time a social worker is going to be dealing A people who are having a difficult time. Often poverty plays a big partin the need for the services of social worker. Social workers often interview people to get an understanding of the problem. From there the social worker will help them to come up with a plan to C their situation.1. A. good B. better C. rich2. A. student B. doctor C. lawyer3. A. take B. think C. develop4. A. with B. on C. in5. A. change B. meet C. improve一、选择填空题目1—Albert, this is Jim.—______________ Jim?选择一项：A. Pleased to see you,B. How do you do,C. Thank you,题目2—What is your major?选择一项：A. Li Mei .B. A fresh man .C. Education.题目3I enjoy__________ books in the library.选择一项：A. readB. readingC. to read题目4She is ____________ General Manager of___________ big company.选择一项：A. a, anB. the, aC. a, the题目5I _____________ an Open University student.选择一项：A. amB. areC. is题目6二、阅读理解：选择题（每题10分）Social Workers Social workers help people overcome problems and make their lives better. If people are homeless, sick, or having family problems, social workers will work with them. If students have trouble in school, social workers help them too.Social workers help these people in different ways. One way is to find resources for people. They find out what kinds of help people need. Then, they set up programs to meet the needs of theindividual12. They may focus on child abuse, poverty, violence, and other problems. For someone with family difficulties, social workers may find a parenting class or a support group. For a homeless person, they may find a place for them to live and a career training program. For a student, they may find a mentor or a learning disability expert.Many social workers give counseling. They talk to people about their lives and help them understand and solve their problems and to make plans.Most social workers spend the day in an office. Some travel to the people they help. Sometimes, they meet with people in the evening or on weekends. Social workers can be very busy when they are helping many people at once.1. According to the text, what is not social workers'job?A. to help people with family problemsB. to make people's lives betterC. to do the housework for people2. For someone with family problems, social workers willA. find them a place to liveB. find them a career training programC. find them a parenting class3. Social workers build to provide the help for people in need.A. problemsB. daysC. resources4. Which of the following sentence is not true?A. Social workers give some advice to people.B. Most social workers think of their job as boring.C. Social workers may help many people at a time.5. The main point of this passage is aboutA. How busy social workers areB. How social workers do their jobC. How tired social workers are一、选择填空题目1—How about going to the class together? 选择一项：A. Of course not.B. That sounds great.C. I don't like it.题目2—Albert, this is Jim.—______________ Jim?选择一项：A. Pleased to see you,B. How do you do,C. Thank you,I would _________ any weakness and any fear.选择一项：A. comeB. overcomeC. throw题目4Social workers should learn how to _________ people.选择一项：A. look atB. look intoC. look after题目5They _____________ some social work at the weekends. 选择一项：A. doB. doesC. did二、翻译题，每题10分操作提示：通过题干后的下拉框选择题目的正确答案。
英语七年级所给词的适当形式填空选择题(难)(1)
英语七年级所给词的适当形式填空选择题(难)(1)一、七年级英语所给词的适当形式填空1．用方框中所给的频度副词填空（2）Dave ________ goes to Hong Kong, so he wants to go there.（3）I ________ have dinner at home, but ________ I have dinner in the restaurants with my friends.（4）— What time do you ________ go to bed?— At about nine thirty.【答案】（1）always（2）never（3）usually；sometimes（4）often【解析】【分析】sometimes有时；often经常；usually通常；always总是；never从不（1）句意：我爸爸总是吃健康的食物，所以他是非常健康的。
爸爸健康的原因是总是吃健康的食物，always总是，副词，修饰实义动词eats，故填always。
（2）句意：Dave从没去香港，所以他想去那。
想去香港的原因是从没有去过那，所以用never，从不，从没有，副词，修饰实义动词goes，故填never。
（3）句意：——我通常在家吃晚饭，但是有时也和朋友在餐馆里吃晚饭。
通常在家吃，有时也在餐馆吃，usually通常，副词，修饰实义动词have，sometimes有时，修饰实义动词have，故填usually，sometimes。
（4）句意：——你经常几点睡觉？——大约九点半。
经常在九点半左右睡觉，often经常，副词，修饰实义动词go，故填often。
【点评】考查选词填空，考查词汇在语篇中的运用能力。
注意理解句意，首先读一遍，然后再逐一作答。
注意句型、搭配、短语及语境。
2．用方框中所给单词的适当形式填空，每词仅使用一次。
（2）Are these your English-Chinese ________?（3）Lily and Lucy ________ my good friends.（4）It is not Kate's schoolbag. ________ is blue.（5）Eric likes his room, ________ he doesn't like the bookcase.【答案】（1）thinks（2）dictionaries（3）are（4）Hers（5）but【解析】【分析】单词意思：be是；but但是；think认为；she她；dictionary字典（1）句意：李老师认为Anna是个好女孩。
中考英语模拟试题(一)(含答案)
中考英语模拟试题（一）(时间：100分钟分值：110分)一、选择填空(本题共15小题，3AA、B．C．D四个选项中，选出可以填人空白处的最佳选项。
每小题1分，满分15分)1.--When did The Smiths arrive at Shanghai?-- ________ the evening of August 18.A. InB. OnC. AtD. For2.--What's the matter with the man ?--It is said that he may catch COVID-19(新冠肺炎)and he has a_______.A. coldB. toothacheC. feverD. headache3.--Shall I book some seats for the cinema?-- _________ . I've done that.A. Yes,you mayB. No,you mustn'tC. I'd rather notD. No,you needn't4.--Mum, could I have some oranges?--Sorry, _____ is left. But we have some apples.A. oneB. noneC. somethingD. nothing5. Travelling from here to the capital will take much less time after the light rail ______ next year.A. will completeB. will be completedC. completesD. is completed6. --I am looking forward to seeing David very soon. Please tell me_________.--Along the Hutong and you will find it.A. how he isB. why did he live thereC. where he livesD. where lives he7. --How did you lose the football match last night?--We had players in the second half. They had eleven while we had only nine!A. lessB. fewerC. moreD. better8.--We have never been to Australia,what about Jeff?-- _____. But he hopes to visit it some day.A. Neither has heB. Neither does heC. So has heD. So does he9.--How often do you go to a concert?-- ________ ever,I'm not interested in that at all.A. HardlyB. AlwaysC. UsuallyD. Often10.--Did you sleep well last night?--Oh,no. _______ noise outside the hotel almost drove me mad.A. Too muchB. So few C, Too many D. So many11.--My mother says that we won't go on a trip to Hong Kong Disneyland.-- ________ You were looking forward to it!A. Never mind.B. Enjoy yourselves!C. What a pity!D. Don't worry about it.12.--You'd better tell your father the truth _______ he comes back.--Ok,I will.A. untilB. thoughC. so thatD. as soon as13. People are starting to use energy from the sun,wind and water. These new types of energy costlittle and will never________.A. run outB. take outC. hand outD. put out14.--Our country a lot so far.--Yes. I hope it will be evenA. has changed;wellB. changed;goodC. has changed;betterD. changed;better15.--I'm afraid I have to give up my dream of being a singer.-- . No dream is too big,and no dreamer is too small.A. Don't lose heartB. No problemC. That's unusualD. You must be joking二、完形填空(本题共15小题，根据短文内容，从各题所给的A、B、C、D四个选项中选出最佳选项。
2024年牛津译林版中考英语一轮复习讲义八年级上册Unit1-unit8(学生版)
学生姓名：科目：英语年级：九年级辅导内容：一模复习（一）8A Units18 辅导日期：预学区知识回顾温习已知【检测一】选择填空（）1．For the time being we can collect much ________ either from books or on the Internet.A．idea B．method C．information D．suggestion（）2．—Dave, did you have fun at the New Year's Party?—Sure! I will never forget each wonderful memory of ________.A．we B．us C．our D．ours（）3．I can take good care of myself. I do not depend on ________.A．anybody B．everybody C．nothing D．something（）4．Don’t play ________ basketball with ________ empty stomach.A．a；a B．the；a C．/；an D．a；an（）5．— How old is your daughter, Mr. Brown?— ________. We had a special party for her ________ birthday last Friday.A．Twelve; twelfth B．Twelfth; twelve C．Twelve; twelve D．Twelfth; twelfth （）6．Erquan Yingyue is one of _________ pieces of music that I've ever heard.A．moving B．more movingC．most moving D．the most moving（）7．—How do you like the talk show?—I think it's ________, but some people think it's so ________.A．wonderful enough; bored B．enough wonderful; boringC．wonderful enough; boring D．enough wonderful; bored（）8．My family get together and have a big dinner ________ Sundays.A．at B．in C．on D．to（）9．—Listen, someone is singing over there in the park.—Oh, the voice ________ so beautiful!A．sounds B．looks C．tastes D．smells（）10．— Mom, must I clean my room now?— No, you ________. You can do it after dinner.A．needn’t B．mustn’t C．shouldn’t D．can’t（）11．—What do you think of the movie Black Beauty?—Fantastic. I________it twice.A．watch B．was watching C．am watching D．have watched（）12．—I want to know if he ________ back tomorrow.—I’ll call you as soon as ________.A．will e; will return B．will e; returnsC．es; will return D．e; returns（）13．I ________ ten English novels since I joined the English reading club.A．reads B．read C．have read D．will read（）14．Many people think that badlybehaved travelers ________ so that they won't behave that way again.A．should punish B．should be punishedC．mustn't be punished D．must punish（）15．— Do you like the song Shao Nian?— Yes. I like the songs ________ I can sing along with.A．that B．who C．what D．where【检测二】词汇运用（综合）1. The of this mountain is 5540 meters. (高度)2. The three space _______ returned to Beijing on September 29th.(英雄)3. Who did in the test in your class? Tony did, he is lazy.(糟糕)4. There will be a drawing in our school next week.(竞赛)5. We the books with our classmates in class yesterday.(讨论)6. Our Maths teacher often tells us funny jokes, all of us think that he is _________(humour).7. The girl with long hair is the (slim) of the three.8. I’m so tired that I can’t walk any____________.(far)9. _____ （learn）a foreign language isn’t hard.10. The radio says it will be much ____________ (rain) tomorrow.探学区知识拓展新知衔接【探究点一】Unit 1知识点1.something to drink/eat 一些喝的/吃的东西2.数字+more = another +数字 e.g. three more = another three3.maybe adv. （副词），意思是“也许、可能”，在句中作状语，相当于perhaps，常位于句首在may be中，may是情态动词，be是动词原形，两者构成完整的谓语形式，与主语形成系表结构，意为“也许是、可能是”。
施工选择填空(1)
一 填空题
• 5．解决围堰防冲的措施有______ 、_________。 • (抛石或柴排护底 上下游转角初设置导流墙) • 6．导流时段的划分与共_________、_________、 _________与_________等相关。 • (河流的水文特征 水工建筑物的布置何形式 导 流方式 施工进度) • 7．截流的施工过程包括________、_________、 _________与_________等。 • (戗堤的进占 龙口范围的加固 合龙 闭气) • 8．截流的基本方法有_______和_______两 种。 • (立堵法 平堵法)
三、判断题 • ９．为使爆破安全准确，当电源电压已 知时，实际通过每个雷管的电流强度i应小 于每个雷管最小准爆电流，即i＜[i]。 • ( X) 10．在大量爆破的起爆网路设计中，采用 复式电爆网路时，准爆的可靠性比较大。 • ( √ )
一、填空题
• 1.整个基坑的开挖程序，应按“________、 （自上而下、分层开挖） ________”的原则进行。
一 填空题
•
• • • • • • •
1．施工导流的基本方法大体上可以分为 ________和_______两类。 (分段围堰法 全段围堰法) 2．用分段围堰法导流时，宣泄水流前期用 _______, 后期用______、_____或______ 等。 (束窄的原河道 底孔 坝体缺口 明槽) 3．围堰按与水流方向的相对位置，可以分为 _________和_________。 (横向围堰 纵向围堰) 4．混凝土围堰的形式有：_______和_____。 (拱形混凝土围堰 重力式混凝土围堰)
一 填空题 • 15. 反映炸药基本性能的指标有＿ ＿＿＿＿、＿＿＿＿、＿＿＿、＿＿ ＿＿＿、＿＿＿和＿＿＿等几个参数。
化工原理下册题库(选择填空判断)1
化工原理(下)题库（1）一、选择题（将正确答案字母填入括号内)1、混合物中某组分的质量与混合物质量之比称为该组分的（A).A. 质量分数B. 摩尔分数C. 质量比2、关于精馏塔中理论的叙述错误的是（ B ）。
A.实际上不存在理论塔板B。
理论塔板仅作为衡量实际塔板效率的一个标准。
C。
理论塔板数比实际塔板数多3、在精馏塔中每一块塔板上（ C ）.A. 只进行传质作用B。
只进行传热作用C。
同时进行传热传质作用4、气体吸收过程中，吸收速率与推动力成（ A )。
A。
正比 B. 反比 C. 无关5、气体的溶解度很大时,溶质的吸收速率主要受气膜一方的阻力所控制，故称为（ A ）.A. 气膜控制B. 液膜控制C. 双膜控制6、普通温度计的感温球露在空气中，所测得的温度为空气的( A ）温度。
A。
干球 B. 湿球 C. 绝热饱和7、混合物中某组分的物质的量与混合物物质的量之比称为该组分的（B）.A. 质量分数B。
摩尔分数C。
质量比8、在蒸馏过程中，混合气体中各组分的挥发性相差越大,越(B）进行分离。
A. 难B. 容易C. 不影响9、气体吸收过程中,吸收速率与吸收阻力成( B ）。
A。
正比B。
反比C。
无关10、气体的溶解度很小时，溶质的吸收速率主要受液膜一方的阻力所控制，故称为（ B )。
A. 气膜控制B. 液膜控制C. 双膜控制11、某二元混合物，进料量为100kmol/h，xF=0。
6,要求得到塔顶xD不小于0。
9，则塔顶最大产量为( B ）A 60kmol/hB 66.7kmol/hC 90kmol/hD 不能定12、二元溶液连续精馏计算中，进料热状态的变化将引起以下线的变化（B ) 。
A平衡线 B 操作线与q线C平衡线与操作线 D 平衡线与q线13、下列情况 ( D ）不是诱发降液管液泛的原因.A液、气负荷过大 B 过量雾沫夹带 C塔板间距过小 D 过量漏液14、以下有关全回流的说法正确的是（A、C ）。
A、精馏段操作线与提馏段操作线对角线重合B、此时所需理论塔板数量多C、塔顶产品产出量少D、此时所用回流比最小15、吸收操作是利用气体混合物中各种组分（ B ）的不同而进行分离的.A、相对挥发度B、溶解度C、气化速度D、电离度16、用水吸收混合气体中的二氧化碳时，（ A ）下吸收效果最好.A．低温高压B．高温高压C．高温低压D．低温低压17、吸收操作的作用是分离（A ）。
八年级英语上学期第一次月考试题牛津版(1)(2021年整理)
（ ） 14. ______ is your school life like ？ It’s wonderful
A WhatB HowC WhereD Why
( ） 15If you keep ______like this ， you will fall behind your classmates
A. 无论什么B。 没问题C. 没关系D。不管怎样
（ ）29.Which of the following is TRUE？
A。 Everyone has merits。B。 Starting the day the right way is not important.
C。 You can learn everything from newspapers。
Americans hold“Be __22___ to Animals Week”in the first week of May。 Pet shows are held during the week。 Even if you don’t live in America， you， too， can do this。 How? If you have a pet, spend ___23___ time this week playing withit.
丰县2017～2018学年度第一学期第一次质量检测八年级英语试题
(时间：90分钟 分值：100分)
一、选择填空 （共15小题,每小题1分，满分15分）
( ) 1。 I’m hungry. Can I have ____________?
A。anything to eatB。something eatingC.anything eatingD.something to eat
2020—2021学年人教部编版五年级第一学期期中检测试卷(含答案)
2020—2021学年度第一学期小学期中检测五年级语文试题卷Array本试卷满分100分，其中卷面分5分。
考试时间90分钟。
一、选择填空。
（一）给加点的字选择正确读音。
1.间．隔（A.jiān B.jiàn ）2.勉强．（A.qiáng B.qiǎng ）3.剥削．（A.xuē B.xiāo ）4.谴．责（A.qián B.qiǎn ）5.树冠．（A.guān B.guàn）6.眼睑．（A.jiǎn B.liǎn ）7.镜匣．（A.xiá B.jiá） 8.依偎．（A.wèi B.wēi ）（二）班级公约是同学们共同制定、认可的规则。
以下不属于班级公约内容的是（）A.不在走廊、教师内大声喧哗。
B.自觉遵守课堂纪律，认真听讲，做好笔记。
C.注意个人卫生及公共部位卫生情况。
D.树立文明服务意识，全心全意为人民服务。
（三）提高阅读速度的方法有很多，下面哪一项不是提高阅读速度的方法（）A.要做到一边读一边想，抓住关键词句。
B.带着问题读，暂时忽略不懂的词语。
C.集中注意力，连词成句地读。
D.遇到不懂的词语，要学会回读，认真思考。
（四）下面四个选项中，字形全部正确的一项是（）A.精巧望却商量允诺B.拒绝新郎稀罕讯期C.悠然唯独协调访问D.防碍震天动地无价之宝（五）关于古诗的硬笔书写，下面要求不正确的是（）A.横向书写古诗时，从左到右，逐行排列。
B.竖向书写古诗时，从上到下从左到右，逐列排开。
C.每一行诗句都居中写，上下左右文字对齐。
D.提高书写速度，不要看一笔写一笔。
（六）下列对画线部分的词语替换有误的一项是( )A.像你这样顾虑太多，前怕狼后怕虎，终究是成不了什么大事的。
(畏首畏尾)B.我按说明书上的方法来钓鱼，却一条也没钓到,简直是鼻子都气歪了。
(气急败坏）C.俗话说,吃水不忘挖井人，就是告诉大家要学会感恩。
(孤掌难鸣) （七）下列对选段内容的概括，最恰当的一项是( )成语是祖先留给我们的文化遗产，是汉语词汇系统中的精华。
初一英语语法练习题(一)
A every days B every of day C every week D everyday
（ ）10．I see a lot of money, but it’s not________money.
A I B my C mine D me
（ ）28．______so much noise? It may wake up the baby.
A Why not make B Why make
C Why not to make D Why don’t make
（ ）29．Do you know the boy sitting between Peter and ____?
What’s this ____(用英语)?It’s_(一个苹果）
——（大扰了）.Is this ___(一把尺子）？
____ ____(不用谢）.
根据要求完成句子
1.这是个橘子吗？不，它不是橘子。
—— ——an orange ?___,it ____.
2.你怎么拼写“apple”?
____ do you ____apple?
A Are B Do C Does D Is
（ ）7．He likes_______and ______football.
A singing; plays B sing; playing
C singing; playing D sing; play
（ ）8．--________are the students playing basketball?--On the playground(操场)A What B Where C How D Why
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
2018届高考选择填空考前训练（一）
黄金组卷
1.若复数21a i i
++（,a R i ∈是虚数单位）是纯虚数，则实数a 的值为（ ） A. -2 B. -6 C. 4 D. 6 2. 已知集合
，，则阴影部分所表示的集合的真子集个数为
（ ）
A ．3
B ．4
C ．7
D ．8
3. 给出下列4个命题： ①回归直线恒过样本点的中心，且至少过一个样本点； ②若散点图中所有的样本点均在同一条直线上，那么残差平方为1，相关系数为0； ③设，“”是“”的充要条件； ④“存在，使得”的否定是“对任意的，均有0
12>++x x ”.
其中真命题的个数是（ ）
A .0
B .1
C .2
D .3
4. 已知，则=（ ） A ． B ． C. D ．
5.已知,x y 满足10304x y x y y -+≤⎧⎪+-≥⎨⎪≤⎩
，若存在,x y 使得2x y a +≤成立，则a 的取值范围是( ) A. ， ∞） B. [)2,+∞ C. [)4,+∞ D. ∞
6. 传说中，古代的国王们出去打仗的时候，因为没有日历，就采取在
绳子上打结的办法计算天数，当绳子上所用的结都被打开的时候，也就
是战争该结束的时候。
这种在绳子上打结来记录数量的方法叫做“结绳
计数”。
下图所示的是一位母亲记录的孩子自出生后的天数，在从右向
左依次排列的不同绳子上打结，满七进一，根据图示可知，孩子已经出生的天数是（ ） A ．336 B ．510 C ．1326 D ．3603
7.数列{}n a 满足()()1111n n n n n n a a a a a a +--+-=-，若122,1a a ==，则20a =( )
{}|lg 1B x Z x =∈<ˆy
bx a =+(,)x y R a ∈1>a 11<a 0x R ∈20010x x ++<x R ∈11sin cos ϕϕ+=0,2πϕ⎛⎫∈ ⎪⎝⎭
()2tan 21x x dx ϕ--⎰13
13-2323-
A. 1012
B. 912
C. 110
D.15
8.
长为AB 在双曲线221x y -=的一条渐近线上移动，C 为抛物线22y x =--上的点，则ABC ∆面积的最小值是( ) A. 72 B. 75
C. 4
D.7 9.
将函1cos sin 22
y x x =+数的图象向右平移()0θθ>个单位长度后关于y 轴对称，则θ的最小值是( ) A. 12π B. 6π C.3
π D.56π 10.已知边长为的菱形中，，若，则的取值范围是（ ）
A ．
B ． C. D ．
11.已知三棱锥S ABC -的底面ABC ∆为正三角形，顶点在底面上的射影为底面的中心，,M N 分别是棱,SC BC 的中点，且MN AM ⊥
，若侧棱SA =，则三棱锥S ABC -的外接球的表面积是( )
A. 12π
B. 32π
C. 36π
D.48π
12.已知定义在上的函数，满足（1）；（2）（其中是的导函数，是自然对数的底数），则的范围为（ ） A ．（） B ．（） C.（e
e 1,21） D ． （3,e e ） 13.已知()()2,1,1,3a b ==-，若存在向量c 使4,9a c b c ⋅=⋅=-，则c = .
14.
若n 展开式中存在常数项，则n 的最小值为 . 15.已知双曲线22
221(b a 0)x y a b -=>>的左、右焦点分别为12,F F ，
过1F 且斜率为1的直线l 与双曲线的两条渐近线分别交于,A B 两点，若
1AF AB =，则双曲线的离心率为 16.若时，关于的不等式恒成立，则实数的取值范围是 ．
2ABCD 120BAD ∠=()01AP AC λλ=<<BP PD ⋅[]0,3[]2,3(]0,3(]2,3()+∞,0()x f ()0>x f ()()()x f x f x f 2<'<()x f '()x f e ()()
21f f e e 1,212e e 1,12[)1,x ∈+∞x ()ln 11
x x x x λ≤-+λ。