选择填空专项训练4答案 (1)

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中考选词填空专项训练(含答案)

中考选词填空专项训练(含答案)

选词填空专项训练1、依次填入下列句子横线的词语,恰当的一项是( )①舞台上台湾女艺术家的演奏动听,观众在这经典乐曲里如痴如醉。

②22-在进行旅游开发论证的千岛湖水下古城,其历史可以到一千年以前。

③只有拥有了广博的阅历、丰富的语汇,我们创作作品才有可能。

A.优雅追溯一气呵成 B.优雅追述一鼓作气C.幽雅追述一气呵成 D.幽雅追溯一鼓作气2、根据下面语境,选择恰当的词语,将序号填在空格处。

我们曾随范仲淹登楼(1)浩淼的洞庭湖,感受它的气象万千;我们曾随郭沫若静静(2)灿烂的星空,领略天街的美妙神奇;我们也曾随宗璞驻足(3)繁盛的紫藤萝,感悟朴索的人生哲理。

A.凝望 B.眺望 C.仰望3、读下面这段文字,为空格处选择合适的词语,将其序号填在横线上。

在这个精彩纷呈的年代,我们要拥有一双智慧的眼睛。

我们登上山巅,⑴旖旎壮丽的山川,留存美丽的风景;我们细数历史,⑵名垂千古的先贤,接受灵魂的洗礼;我们畅想前景,⑶灿烂美好的未来,获取希望的动力。

A.展望 B.眺望 C.仰望4、根据下面语境,选择合适的词语填写在相应的横线上。

行走在诗意的江南,醇厚的文化味儿让你陶醉。

迷人的田野着四千年蚕桑的浓厚气息,宁静的乡村着耕读传家的人文精神,热闹的古镇着中华商业文明的辉煌。

在这里,自然与文化交融,传统与现代互动,处处展现出水乡独特的神韵和魅力!A.隐含B.彰显C.散发5、根据下面语境,选择恰当的词语,将序号填在横线上。

我梦想漫步在钱塘江畔,在潮起潮落中,感受“震撼激射,吞天沃日”的⑴;我梦想徜徉在滕王阁下,在落暮余辉里,想象“千里逢迎,高朋满座”的⑵;我梦想登临泰山之巅,在红日喷薄时,欣赏“造化钟神秀,阴阳割昏晓”的⑶。

A.壮阔B.壮丽C.壮观6、根据语境,依次填写词语最恰当的一项是( )①在一片中,我伏在岩石上,恐惧和疲乏使我全身麻木,不能动弹。

②最使我吃惊的是,后边几排一向空着的板凳上坐着好些镇上的人,他们也跟我们一样。

专项训练八年级英语完形填空专项练习(附答案)(1)

专项训练八年级英语完形填空专项练习(附答案)(1)

一、八年级英语完形填空训练1.通读下面的短文,掌握其大意,然后从所给的A、B、C三个选项中选出一个最佳答案。

Would you like to take a trip if you could not use your cellphone during it? Not even a camera?A new travel company called Off the Grid is asking 1 to do just that."When you're somewhere 2 , there's a lot to hear, a lot to see, a lot of cool, interesting people to meet," Beattie said. "Your phone can distract(使分心)you. You may not be 3 enjoying the trip." The cellphone ban will not be forced(强迫) upon the customers. "We want it to be a volunteer," Beattie said. "We're not collecting phones…" Travelers will be able to use a simple cell phone with useful 4 phone numbers. Off the Grid travelers are not allowed to bring usual 5 to take photos. But the company also has a photographer to take pictures during the tour. 6 the trip is over, travelers can post the photos on social media(媒体). "I think it's interesting and challenging(挑战的)to say, Can I enjoy this moment 7 a camera? Can I have this memory be part of me without sharing with someone else at once?"The company's first trip is to Lisbon, Portugal, in July. The 7-to-10-day tours are for small groups,no more than 16 people. Trip 8 begin at $1,500. The cost includes stays in hotels, some meals and ground transportation. It does not include air tickets. Off the Grid prefers special experiences rather than 9 sightseeing (观光). The trips include at least three activities and two social events. The Lisbon trip, for example, includes surfing lessons, exercise by the sea,a day of boating and dinner with a local 10 . Beattie says he doesn't want the travelers tobe too busy going from one place to another.1. A. customers B. managers C. bosses2. A. new B. strange C. old3. A. fully B. directly C. gradually4. A. local B. foreign C. central5. A. recorders B. cameras C. videos6. A. Once B. Unless C. Since7. A. with B. without C. about8. A. plans B. prices C. suggestions9. A. national B. international C. traditional10. A. government B. family C. company【答案】(1)A;(2)A;(3)B;(4)A;(5)B;(6)A;(7)B;(8)B;(9)C;(10)B;【解析】【分析】文章大意:本文主要介绍一家旅游公司推出一种新型的旅游——断网旅游。

大学英语四级选词填空专项训练题目及答案

大学英语四级选词填空专项训练题目及答案

大学英语四级选词填空专项训练题目及答案今日为大家预备的是大学英语四级选词填空专项训练的题目及答案,希望对大家的四级考试备考有关怀。

Modern people have far more gum disease than our predecessors, according to a British study of skulls published Friday. The surprise findings provide further (1)_______ that modern habits such as smoking are damaging to oral health.Gum disease, also known as periodontitis (牙周炎), is the (2) _______ of a chronic inflammatory (发炎的) response to the build-up of dental plaque (牙菌斑). Whilst much of the population lives with mild gum disease, (3) _______ such as tobacco smoking or medical conditions like diabetes can trigger more (4) _______ chronic periodontitis, which can lead to the loss of teeth.The study, published in the British Dental Journal, (5) _______ 303 skulls from a Romano-British burial ground in England, for evidence of dental disease. Only 5 percent of the skulls showed (6) _______ of moderate to severe gum disease, compared to todays population of which around 15-30 percent of adults have chronic progressive periodontitis.According to experts, this (7) _______ population was non-smoking and likely to have had very low levels of diabetes mellitus (糖尿病), two factors that are known to (8) _______ increase the risk of gum disease in modern populations. Among the people who survived into adulthood, the peak age at death appears to have been in their 40s. Infectious diseases are thought to have been a common cause of death at that time.Experts concluded that, this study shows a major deterioration in oral health between Roman times and modern England. By underlining the probable role of smoking, (9) _______ in determining the susceptibility to progressive periodontitis in modern populations, there is a real sign that the disease can be (10) _______.A) severe B) avoided C) trend D) examinedE) especially F) result G) course H) justifiedI) ancient J) signs K) evidence L) normalM) determined N) greatly O) factors答案:1. K) evidence2. F) result3. O) factors4. A) severe5. D) examined6. J) signs7. I) ancient8. N) greatly9. E) especially10. B) avoided四级选词填空练习题科技类While still relatively novel in the United States, so-called green roofs urban rooftops covered with grasses, plants and other types of greenery are becoming increasingly popular around the world.The logic is obvious: Green roofs can help to cool down buildings and pull some carbon dioxide from the air and feed it back into plant (1)_______.But the (2)_______ benefits of green roofs to busy office workers may also be substantial. Kate Lee and a group of colleagues found that (3)_______ anattention-demanding task with a 40-second microbreak in which one simply looks at a computerized (4)_______ of a green roof improved focus as well as subsequent performance on the task.In the research, 150 students were asked to perform a demanding task called the Sustained Attention to Response Task (SART). In the task, respondents view a (5)_______ of individual numbers, between 1 and 9, on a computer screen. Each number flashes by very (6)_______ and the research subject has to press a particular key as fast as possible unless, the number is 3. In that case, subjects have to catch themselves and not respond which is difficult to do, given the habit built up of repeatedly and quickly (7)_______ the key.In the current study, students had to (8)_______ the SART task not once, but twice. However, they received a 40-second microbreak in between the two trials. During that break, their computer screens flashed either to a digital image of a city building roof covered in (9)_______, or one covered with grass and flowers. Then, they completed the remainder of the SART trial.Afterward, the students (10)_______ to the green roof scene not only reported that it felt more restorative (恢复健康的), they performed better on the task. In particular, they showed less fluctuation in response time, and made fewer errorsA) series B) clicking C) imageD) concrete E) interrupting F) fairlyG) growth H) total I) exposed J) completeK) panic L) explained M) rapidlyN) relation O) psychological答案:1. G) growth2. O) psychological3. E) interrupting4. C) image5. A) series6. M) rapidly7. B) clicking8. J) complete9. D) concrete10. I) exposedAlthough progress has been made, equality between male and female professionals remains a critical issue.According to a (1) _______ released by global recruitment specialist group Hays on Tuesday, women are less likely than their male co-workers to believe that pay equality and (2) _______ opportunities exist for both genders in the workplace.Hays polled 521 professionals, 55 percent of whom were female. Only 7 percent of women aged 25 or under think there is (3) _______ inequality of pay. But as they progress in their career, that number (4) _______. About 29 percent of women aged between 26 and 40, and 35 percent of women aged 41 or above think there is gender inequality of pay.In general, transport and distribution, mining and (5) _______, as well as professional services, drew the most negative answers among both male and female professionals (6) _______ equal pay.But the (7) _______ of polled men think that the situation is not that bad, as only 13 percent of them think that equally capable men and women are not paid or (8) _______ equally.This suggests that most people in executive and (9) _______ management roles-the majority of whom are men-still fail to see any inequality when it comes to pay and career opportunities between the sexes. This makes it difficult to see how we will see any significant advancement in this area while the majority of people in senior roles do not (10) _______ it as an issue, said Christine Wright, managing director of Hays.A) declines B) senior C) concerningD) majority E) rewarded F) resourcesG) advanced H) determining I) recognizeJ) increases K) survey L) identityM) equal N) totally O) gender答案:K) surveyM) equalO) genderJ) increasesF) resourcesC) concerningD) majorityE) rewardedB) seniorI) recognize。

2021-2022学年统编版六年级上册第一二单元按课文填空专项训练(含解析)

2021-2022学年统编版六年级上册第一二单元按课文填空专项训练(含解析)

2021-2022学年统编版六年级上册第一二单元按课文填空专项训练(含解析)一、按课文填空1.补全本课的词语。

并完成练习。

①一____千里②____色____流③____飘带舞①久立四____(1)把下面的四字词语补充完整。

(2)词语①②都是描写“绿”的,其中词语________形容“绿”的范围广,词语________描绘“绿”的动态美。

(填序号)(3)选词填空。

(填词语)到了夏天,大雨后的原野________。

密密层层的绿叶上挂满了亮晶晶的水珠,到处________真是美不胜收。

这样的环境,让人既愿________,又想坐下低吟一首奇丽的小诗。

2.熟读课文,回答问题。

《草原》作者________,作品有话剧________ 、________,小说________,1950创作________,获北京市政府授予“________”称号。

3.课文依次写了________ 、________、亲切会见、热情款待、________。

4.根据课文内容填空。

(1)走了许久,远远地望见了一条迂回的明如玻璃的带子——河!“迂回”的意思是________;“迂回”写出了________ ;“明如玻璃”的意思是________,“明如玻璃”说明了________。

(2)课文是按照________顺序叙述的,可以分成四部分,它们的小标题分别是:________、________、________、________。

(3)“蒙汉情深何忍别,天涯碧草话斜阳。

”这句话的意思是________(4)课文静态描写的是________,动态描写的是________。

5.根据课文《丁香结》内容填空句。

(1)文章第一段和第二段分别从________和________描写丁香花,描写了它的形状、颜色和气味。

(2)文中引用的诗句是“”。

(3)作者运用________的手法,将丁香花拟人化,写出丁香花________的特点。

文章虚实结合,实写________,虚写________。

语法填空专项训练4篇(附答案及解析)

语法填空专项训练4篇(附答案及解析)

语法填空专项练4篇( 1 )第二节语法填空(共10小题;每小题1. 5分,满分15分)阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填人一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡标号为3l-40的相应位置上。

A jobless man applied for the position of “office boy” at a big firm.The HR manager ___31__ (interview) him, then a test: clean the floor. “You are hired,” he said, “give me your email address, ___32__ I’ll send you the application to fill.” The man replied “I don’t have a computer, ___33__ an email”.“I’m sorry,” said the HR manager, “that means you do not exist. And ___34__ doesn’t exist cannot have the job.” The man left ___35__ no hope at all. He didn’t know what to do, with only $10 in his pocket.He then decided to go to the supermarket and buy a 10 KG tomato crate. He then sold the tomatoes in a door to door round. In less than two hours, he ___36__ (success) in doubling his capital. He repeated the operation 3 times, and returned home with $60.5 years later, the man is one of the ___37__ (big) food retailers(零售商) in the US. He started to plan his family’s future, and decided to have a life insurance.He called ___38__ insurance broker, and chose a protection plan. When the conversation was concluded, the broker asked him his email. The man replied: “I don’t have an email”. The broker replied ___39__ (curious), “You don’t have an email, and yet have established an empire! Do you imagine ___40__ you could have been if you had an email?The man thought for a while, and replied: “An office boy!”( 2)第二节语法填空(共10小题;每小题1. 5分,满分15分)阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填人一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡标号为3l-40的相应位置上。

高考数学选择、填空题专项训练(共40套)[附答案]

高考数学选择、填空题专项训练(共40套)[附答案]

三基小题训练一一、选择题(本大题共12小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的)1.函数y =2x +1的图象是 ( )2.△ABC 中,cos A =135,sin B =53,则cos C 的值为 ( )A.6556B.-6556C.-6516D. 65163.过点(1,3)作直线l ,若l 经过点(a ,0)和(0,b ),且a ,b ∈N *,则可作出的l 的条数为( )A.1B.2C.3D.多于34.函数f (x )=log a x (a >0且a ≠1)对任意正实数x ,y 都有 ( )A.f (x ·y )=f (x )·f (y )B.f (x ·y )=f (x )+f (y )C.f (x +y )=f (x )·f (y )D.f (x +y )=f (x )+f (y )5.已知二面角α—l —β的大小为60°,b 和c 是两条异面直线,则在下列四个条件中,能使b 和c 所成的角为60°的是( )A.b ∥α,c ∥βB.b ∥α,c ⊥βC.b ⊥α,c ⊥βD.b ⊥α,c ∥β6.一个等差数列共n 项,其和为90,这个数列的前10项的和为25,后10项的和为75,则项数n 为 ( )A.14B.16C.18D.207.某城市的街道如图,某人要从A 地前往B 地,则路程最短的走法有 ( )A.8种B.10种C.12种D.32种8.若a ,b 是异面直线,a ⊂α,b ⊂β,α∩β=l ,则下列命题中是真命题的为( )A.l 与a 、b 分别相交B.l 与a 、b 都不相交C.l 至多与a 、b 中的一条相交D.l 至少与a 、b 中的一条相交9.设F 1,F 2是双曲线42x -y 2=1的两个焦点,点P 在双曲线上,且1PF ·2PF =0,则|1PF |·|2PF |的值等于( ) A.2B.22C.4D.810.f (x )=(1+2x )m +(1+3x )n (m ,n ∈N *)的展开式中x 的系数为13,则x 2的系数为( )A.31B.40C.31或40D.71或8011.从装有4粒大小、形状相同,颜色不同的玻璃球的瓶中,随意一次倒出若干粒玻璃球(至少一粒),则倒出奇数粒玻璃球的概率比倒出偶数粒玻璃球的概率( )A.小B.大C.相等D.大小不能确定12.如右图,A 、B 、C 、D 是某煤矿的四个采煤点,l 是公路,图中所标线段为道路,ABQP 、BCRQ 、CDSR 近似于正方形.已知A 、B 、C 、D 四个采煤点每天的采煤量之比约为5∶1∶2∶3,运煤的费用与运煤的路程、所运煤的重量都成正比.现要从P 、Q 、R 、S 中选出一处设立一个运煤中转站,使四个采煤点的煤运到中转站的费用最少,则地点应选在( )A.P 点B.Q 点C.R 点D.S 点二、填空题(本大题共4小题,每小题4分,共16分.把答案填在题中横线上)13.抛物线y 2=2x 上到直线x -y +3=0距离最短的点的坐标为_________.14.一个长方体共一顶点的三个面的面积分别是2,3,6,这个长方体对角线的长是_________.15.设定义在R 上的偶函数f (x )满足f (x +1)+f (x )=1,且当x ∈[1,2]时,f (x )=2-x ,则f (8.5)=_________.16.某校要从甲、乙两名优秀短跑选手中选一名选手参加全市中学生田径百米比赛,该校预先对这两名选手测试了8次,测试成绩如下:第1次 第2次 第3次 第4次 第5次 第6次 第7次 第8次 甲成绩(秒) 12.1 12.2 13 12.5 13.1 12.5 12.4 12.2 乙成绩(秒)1212.412.81312.212.812.312.5根据测试成绩,派_________(填甲或乙)选手参赛更好,理由是____________________. 答案:一、1.A 2.D 3.B 4.B 5.C 6.C 7.B 8.D 9.A 10.C 11.B 12.B二、13.(21,1) 14.6 15. 21三基小题训练二一、选择题:本大题共12小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.如图,点O 是正六边形ABCDEF 的中心,则以图中点 A 、B 、C 、D 、E 、F 、O 中的任意一点为始点,与始点不 同的另一点为终点的所有向量中,除向量OA 外,与向量OA 共线的向量共有( )A .2个B . 3个C .6个D . 7个2.已知曲线C :y 2=2px 上一点P 的横坐标为4,P 到焦点的距离为5,则曲线C 的焦点到准线的距离为 ( )A . 21B . 1C . 2D . 43.若(3a 2 -312a ) n 展开式中含有常数项,则正整数n 的最小值是 ( )A .4B .5C . 6D . 84. 从5名演员中选3人参加表演,其中甲在乙前表演的概率为 ( )A . 203B . 103C . 201D . 1015.抛物线y 2=a(x+1)的准线方程是x=-3,则这条抛物线的焦点坐标是( ) A.(3,0) B.(2,0) C.(1,0) D.(-1,0)6.已知向量m=(a ,b ),向量n⊥m,且|n|=|m|,则n的坐标可以为( ) A.(a ,-b ) B.(-a ,b ) C.(b ,-a ) D.(-b ,-a )7. 如果S ={x |x =2n +1,n ∈Z },T ={x |x =4n ±1,n ∈Z },那么A.S TB.T SC.S=TD.S ≠T8.有6个座位连成一排,现有3人就坐,则恰有两个空座位相邻的不同坐法有 ( )A .36种B .48种C .72种D .96种9.已知直线l 、m ,平面α、β,且l ⊥α,m β.给出四个命题:(1)若α∥β,则l ⊥m ; (2)若l ⊥m ,则α∥β;(3)若α⊥β,则l ∥m ;(4)若l ∥m ,则α⊥β,其中正确的命题个数是( )A.4B.1C.3D.2EF DOC BA10.已知函数f(x)=log 2(x 2-ax +3a)在区间[2,+∞)上递增,则实数a 的取值范围是( )A.(-∞,4)B.(-4,4]C.(-∞,-4)∪[2,+∞)D.[-4,2)11.4只笔与5本书的价格之和小于22元,而6只笔与3本书的价格之和大于24元,则2只笔与3本书的价格比较( )A .2只笔贵B .3本书贵C .二者相同D .无法确定12.若α是锐角,sin(α-6π)=31,则cos α的值等于 A.6162- B. 6162+ C. 4132+ D. 3132-二、填空题:本大题共4小题,每小题4分,共16分.答案填在题中横线上. 13.在等差数列{a n }中,a 1=251,第10项开始比1大,则公差d 的取值范围是___________.14.已知正三棱柱ABC —A 1B 1C 1,底面边长与侧棱长的比为2∶1,则直线AB 1与CA 1所成的角为 。

六年级数学上册填空专项训练附答案(1)

六年级数学上册填空专项训练附答案(1)

六年级数学上册填空专项训练1.下图中,三个圆的圆心在一条直线上,三个圆的半径的长度(单位:cm)如图,长方形的周长是( )cm,面积是( )cm2。

2.画圆时,圆规两脚之间的距离就是圆的( )。

画一个周长是25.12 cm 的圆,圆规两脚间的距离应是( )cm,画出的圆的面积是( )cm2。

3.一个圆环,外圆半径是内圆半径的2倍,这个圆环的面积是外圆面积的。

4.如右图,在一个长10 cm,宽8 cm的长方形中剪一个半圆形,剪成的半圆形的周长是( )cm,面积是( )cm2。

5.如右图,一张长方形硬纸板,正好可以剪成两个完全一样的圆,已知长方形的宽是4 cm,其中一个圆的周长是( )cm,剩余纸板的面积是( )cm2。

6.把一张圆形纸片沿半径剪成若干等份,可以拼成一个近似的长方形。

已知该长方形的周长等于8.28 dm,原来这张圆形纸片的面积是( )dm2。

7.把一块圆形铁皮剪成两块相同的半圆形铁皮,周长增加了20 cm,这块圆形铁皮的面积是( )cm2。

8.一个圆的周长为31.4 m,若半径增加2 m,则直径增加( ) m,周长增加( ) m,面积增加( )m2。

9.如图,阴影部分的面积是8 dm2,图中圆环的面积是( )dm2。

10.如图,圆的半径为12 cm,圆的外面和里面各有一个正方形。

外面正方形的面积是( )cm2;里面正方形的面积是( )cm2。

11.如图所示,以公园为观测点。

(1)超市在公园( )偏( )( )°方向上,距离公园( )m。

(2)书店在公园( )偏( )( )°方向上,距离公园( )m。

(3)中心医院在公园( )偏( )( )°方向上,距离公园( )m。

(4)( )在公园南偏东45°方向上,距离公园900 m。

12.某海域一艘轮船发生事故,船上雷达搜索显示附近有一艘军舰、一艘货船和一艘商船。

如图所示,以出事轮船为观测点。

(1)军舰在出事轮船( )偏( )( )°方向上,距离是( )km;货船在出事轮船( )偏( )( )°方向上,距离是( )km;商船在出事轮船( )偏( )( )°方向上,距离是( )km。

五年级下册数学优学1+1专项训练四答案

五年级下册数学优学1+1专项训练四答案

五年级下册数学优学1+1专项训练四答案一、填空题。

(每小题2分,共20分)1、十八亿四千零五十万九千写作( ),改写成以万作单位写作( )。

2、5吨820千克=( )千克,100分钟=( )小时。

3、X-42=-20X,X=()。

4、在3.14,1 ,162.5%和1 这五个数中,最大的数是( ),相等的数是( )。

5、三个大小相等的正方形,拼成一个长方形,这个长方形的周长是24厘米,每个正方形的边长是()厘米,这个长方形的面积是()平方厘米。

6、有两堆苹果,如果从第一堆拿9个放到第二堆,两堆苹果的个数相等;如果从第二堆拿12个放到第一堆,则第一堆苹果的个数是第二堆苹果个数的2倍。

原来第一堆有苹果()个,第二堆有苹果()个。

7、一根长1米2分米的木料,把它截成两段,表面积增加了24平方厘米,这根木料原来的体积是()平方厘米。

8、某人到十层大楼的第十层办事,他从一层到第五层用64秒,那么以同样的速度往上走到第十层,还需要()秒才能到达。

9、在一个盛满水的底面半径是20厘米的圆柱形容器里,有一个底面半径是10厘米的钢铸圆锥体浸没在水中。

取出圆锥后,容器内的水面下降5厘米。

这个圆锥高()厘米。

10、一辆小车从A城到B城需用10小时,一辆货车从B城到A 城需用15小时。

这两辆车分别从A、B两城同时出发,相向开出,在离B城20千米处相遇,则A、B两城相距()千米。

二、判断。

(对的打√,错的打×)(5分)1、一个等腰三角形的顶角是锐角,则这个三角形一定是锐角三角形。

( )2、三位小数a精确到百分位是8.60,那么a最大为8.599。

( )3、一根铁丝长240厘米,焊成一个长方体框架,长、宽、高的比是3∶2∶1,它的体积是6000立方厘米。

( )4、侧面积相等的两个圆柱,表面积也一定相等。

( )5、两个自然数的公有质因数的积一定是这两个数的最大公因数。

( )三、选择正确答案的序号填入括号内。

(每小题2分,共10分)1、下列叙述正确的是( )。

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选择填空专项训练4
班级:姓名:日期:
一.选择题:
1.(5分)设集合,集合B是f(x)=ln(1﹣|x|)的定义域,则A∪B()[]
,得
A={x|}={x|
B={x|
2.(5分)已知曲线的一条切线的斜率为,则切点的横坐标为()
的一条切线的斜率为
==,解得
3.(5分)已知定义在R上的函数y=f(x)和y=g(x),则“y=f(x)和y=g(x)都是奇函
4.(5分)函数的最大值为()
B
y=)﹣
cosx+sinx
cosx+

=
的最大值为
5. 若M、N为两个定点且|MN|=6,动点P满足PM·PN=0,则P点的轨迹是()
A .圆
B .椭圆
C .双曲线
D .抛物线
[答案] A
[解析] 以MN 的中点为原点,直线MN 为x 轴建立直角坐标系.并设M (-3,0),N (3,0),P (x ,y ),
则PM →·PN →=(-3-x ,-y )·(3-x ,-y ) =(x 2-9)+y 2=0,即x 2+y 2
=9. 6.(5分)已知数列{a n }的通项公式为,则数列{a n }( )
把数列的通项公式看作函数解析式,令
内的值,而
=
最接近7.双曲线x
n -y 2=1(n >1)的两焦点为F 1,F 2,点P 在双曲线上,且满足:|PF 1|+|PF 2|=2n +2,
则△PF 1F 2的面积是( )
A .1 B.12 C .2
D .4
[答案] A
[解析] 由条件知⎩⎨⎧
|PF 1|-|PF 2|=2n
|PF 1|+|PF 2|=2n +2

∴|PF 1|=n +2+n ,|PF 2|=n +2-n
又∵|F 1F 2|=2n +1,∴|PF 1|2+|PF 2|2=|F 1F 2|2, ∴S △PF 1F 2=1
2|PF 1|·|PF 2|
=1
2
(n +2+n )(n +2-n )=1. 8.若椭圆mx 2+ny 2=1(m >0,n >0)与直线y =1-x 交于A ,B 两点,过原点与线段AB 中点的连线的斜率为1
2
,则椭圆的离心率为( )
A.12
B.22
C.
3
2
D.62
[答案] B
[解析] 设A (x 1,y 1),B (x 2,y 2),则AB 中点为⎝⎛⎭⎫
x 1+x 22

y 1+y 22,mx 12+ny 12=1,mx 22+ny 22=1,两式相减得
y 1+y 2x 1+x 2
=-m n ×x 1-x 2y 1-y 2,∴12=-m n ×(-1),即m n =1
2,离心率e =
1m -1n
1m =1-m n =2
2
,故选B.
9.(5分)设定义域为R 的函数f (x )=
,则关于x 的方程f 2
(x )
到点Q的距离与点P到抛物线的准线距离之和的最小值是()
A.5 B.8
C.17-1
D.5+2
[答案] C
[解析]抛物线y2=4x的焦点为F(1,0),圆x2+(y-4)2=1的圆心为C(0,4),设点P到抛物线的准线距离为d,根据抛物线的定义有d=|PF|,∴|PQ|+d=|PQ|+|PF|,由圆的几何性质及三角形两边之和大于第三边可知,当P、Q、F、C四点共线时取最小值,故最小值为|FC|-1=17-1.
11.(5分)(2009•湖南)已知D是由不等式组,所确定的平面区域,则圆x2+y2=4
B
,结合二元一次不等式(组)与平面区域的关系画出其
如图阴影部分表示所以劣弧

BOA=BOA=.
A的长度为×=.
且周期等于
)﹣(
对称,且函数)是奇函数,且周期等于

以及′()′(′(
,,,,,
13.(5分)△ABC中,它的三边分别为a,b,c,若A=120°,a=5,则b+c的最大值为.

25+
(≤
故答案为:
2
范围是a≤﹣2,或a≥2.
15.(5分)设函数f(x)的定义域为D,若存在非零实数l使得对于任意x∈M(M⊆D),有x+l∈D,且f(x+l)≥f(x),则称f(x)为M上的“l高调函数”.现给出下列命题:
①函数f(x)=2x为R上的“1高调函数”;
②函数f(x)=sin2x为R上的“A高调函数”;
③如果定义域为[﹣1,+∞)的函数f (x )=x 2
为[﹣1,+∞)上“m 高调函数”,那么实数m 的取值范围是[2,+∞);
其中正确的命题是 ①②③ .(写出所有正确命题的序号) 16. 设直线l :y =2x +2,若l 与椭圆x 2+y 4=1的交点为A 、B ,点P 为椭圆上的动点,则使△P AB 的面积为2-1的点P 的个数为________.
[答案] 3
[解析] 设与l 平行且与椭圆相切的直线方程为y =2x +b , 代入x 2
+y 2
4
=1中消去y 得,8x 2+4bx +b 2-4=0,
由Δ=16b 2-32(b 2-4)=0得,b =±22,
显见y =2x +2与两轴交点为椭圆的两顶点A (-1,0),B (0,2), ∵直线y =2x +22与l 距离d =22-25

∴欲使S △ABP =12|AB |·h =5
2h =2-1,须使h =22-25,∵d =h ,∴直线y =2x +22与
椭圆切点,及y =2x +4-22与椭圆交点均满足,∴这样的点P 有3个.。

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