2017届高三上学期周考文(2016.12)
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广东省珠海市2016-2017学年高三上学期周考数学(文)试题一、选择题(每小题5分,共60分) 1.已知21zi i=++,则复数z =( ) A .13i -+ B .13i - C .13i -- D .13i + 2.设x R ∈,则“12x >”是“2210x x +->”的( ) A .充分不必要条件 B .必要不充分条件C .充分必要条件 D .既不充分也不必要条件3.若变量x ,y 满足2,239,0,x y x y x +≤⎧⎪-≤⎨⎪≥⎩则x 2+y 2的最大值是( )(A )4 (B )9 (C )10 (D )124.ABC △中,角A ,B ,C 的对边分别是a ,b ,c ,已知22,2(1sin )b c a b A ==-,则A=( ) (A )3π4(B )π3 (C )π4 (D )π65.函数y=sinx 2的图象是( )6.下列函数中既是奇函数又在区间[-1,1]上单调递减的是( )A .x y sin =B .1+-=x yC .x x y +-=22lnD .)22(21xx y -+= 7.已知向量,a b,满足()()26a b a b +-=- ,且1,2a b == ,则a 与b 的夹角为( )A .4π B .3π C .6π D .23π8.一个由半球和四棱锥组成的几何体,其三视图如图所示.则该几何体的体积为( ) (A )12+π33 (B)1+π33 (C)1+π36(D)1+π69.数列111111,2,3,4,,248162n n +++++ 的前n 项和等于( )A .21122n n n+-++ B .2122n n n ++ C .2122n n n +-+ D .21122n n n+--+10.已知0,0,lg2lg8lg2x y x y >>+=,则113x y+的最小值是( ) A .2 B..4 D.11.已知双曲线22221x y a b-=(0a >,0b >)经过点()2,3,且离心率为2,则它的焦距为( )A .2B .4C .6D .812.若,,a b c n N >>∈且11n a b b c a c +≥---恒成立,则n 的最大值是( )A .2B .3C .4D .6 二、填空题(每小题5分,共20分) 13.已知点在函数的图像上,则14.已知()f x 为偶函数,当0x ≤ 时,1()e x f x x --=-,则曲线()y f x =在点(1,2)处的切线方程是_________.15.已知||1,||2,a b a b ==与的夹角为60°,则2a b + 在b 方向上的投影为 ;16.已知正实数a,b,c 满足c c a b c ace ln ln ,21+=≤≤,其中e 是自然对数的底数,则a b ln 的取值范围是____.广东省珠海市2016-2017学年高三上学期周考数学(文)试题答题卷姓名: 班级: 座号:填空题13. 14. 15. 16. 三、解答题17.(12分)已知||4a = ,||3b = ,(23)(2)61a b a b -⋅+=. (1)求a b ⋅的值;(2)求||a b + 的值.18.(12分)设公差不为0的等差数列{}n a 的首项为1,且2514,,a a a 构成等比数列. (1)求数列{}n a 的通项公式;(2)若数列{}n b 满足*121211,2n n n b b b n N a a a +++=-∈ ,求{}n b 的前n 项和n T .19.(12分)如图,四棱锥ABCD P -中,PA ⊥平面ABCD ,AD BC ∥,3AB AD AC ===,4PA BC ==,M 为线段AD 上一点,2AM MD =,N 为PC 的中点.(Ⅰ)证明MN ∥平面PAB ; (Ⅱ)求四面体N BCM -的体积.20.(12分)已知椭圆C :22221x y a b+=过A (2,0),B (0,1)两点.(Ⅰ)求椭圆C 的方程及离心率;(Ⅱ)设P 为第三象限内一点且在椭圆C 上,直线PA 与y 轴交于点M ,直线PB 与x 轴交于点N ,求证:四边形ABNM 的面积为定值.21.(12分)函数()ln f x x x =. (I )求函数()f x 的单调递减区间;(II )若2()6f x x ax ≥-+-在(0,)+∞上恒成立,求实数a 的取值范围; (III )过点2(,0)A e --作函数()y f x =图象的切线,求切线方程.22.(10分)选修4-4:坐标系与参数方程在直角坐标系xOy 中,曲线1C 的参数方程为()sin x y ααα⎧⎪⎨=⎪⎩,为参数,.以坐标原点为极点,以x 轴的正半轴为极轴,建立极坐标系,曲线2C 的极坐标方程为sin()4ρθπ+=(Ⅰ)写出1C 的普通方程和2C 的直角坐标方程;(Ⅱ)设点P 在1C 上,点Q 在2C 上,求|PQ|的最小值及此时P 的直角坐标.广东省珠海市2016-2017学年高三上学期周考数学(文)试题参考答案1.B 【解析】试题分析:()()i i i z 3121+=++=,所以i z 31-=,故选B. 考点:复数的运算 2.A 【解析】试题分析:2121012x x x +->⇔<-或x>,故“12x >”是“2210x x +->”的充分不必要条件,故选A . 考点:充要条件. 3.C 【解析】试题分析:画出可行域如图所示,点A (3,-1)到原点距离最大,所以22max ()10x y +=,选C.【考点】简单线性规划【名师点睛】本题主要考查简单线性规划的应用,是一道基础题目.从历年高考题目看,简单线性规划问题是不等式中的基本问题,往往围绕目标函数最值的确定,涉及直线的斜率、两点间的距离等,考查考生的绘图、用图能力,以及应用数学知识解决实际问题的能力. 4.C 【解析】 试题分析: 因为,b c =所以由余弦定理得:()2222222cos 22cos 21cos a b c bc b b b =+-A =-A =-A ,又因为()2221sin a b =-A ,所以cos sin A =A ,因为cos 0A ≠,所以tan 1A =,因为()0,πA∈,所以4πA =,故选C .考点:余弦定理【名师点睛】本题主要考查余弦定理的应用、三角函数的同角公式及诱导公式,是高考常考知识内容.本题难度较小,解答此类问题,注重边角的相互转换是关键,本题能较好的考查考生分析问题解决问题的能力、基本计算能力等. 5.D 【解析】试题分析:因为2sin =y x 为偶函数,所以它的图象关于y 轴对称,排除A 、C 选项;当22x π=,即x =时,1max y =,排除B 选项,故选D . 考点:三角函数图象.【方法点睛】给定函数的解析式识别图象,一般从五个方面排除、筛选错误或正确的选项:(1)从函数的定义域,判断图象左右的位置,从函数的值域,判断图象的上下位置;(2)从函数的单调性,判断图象的变化趋势;(3)从函数的奇偶性,判断图象的对称性;(4)从函数的周期性,判断函数的循环往复;(5)从特殊点出发,排除不符合要求的选项. 6.C 【解析】试题分析:A.x y sin = 是奇函数,但在区间[]1,1-上是单调递增函数,B.1+-=x y 既不是奇函数,也不是偶函数,C.xxy +-=22ln的定义域是()2,2-,并且满足()()x f xxx f -=-+=-22ln,所以函数是奇函数,并且设()24124222++-=+++-=+-=x x x x x u ,函数在区间[]1,1-是减函数,D.()x x y -+=2221的定义域为R ,满足()()x f x f =-,所以函数是偶函数,故选C. 考点:函数的性质 7.B 【解析】试题分析:()()222122112cos 22623a b a b a a b b cos πθθθ+-=+∙-=+⨯-⨯=-⇒=⇒= ,故选B .考点:向量的基本运算. 8.C 【解析】1,高为1,所以其体积为31141111(323236π⨯⨯⨯+⨯=+,选C. 【考点】三视图,几何体的体积【名师点睛】本题主要考查三视图及几何体的体积计算,本题涉及正四棱锥及球的体积计算,综合性较强,较全面地考查考生的识图用图能力、空间想象能力、数学基本计算能力等. 9.A 【解析】试题分析:因n n n a 21+=,故∑=-++=+ni n n n n 122112)1()21(,故应选A.考点:等差数列和等比数列的前n 项和. 10.C 【解析】 试题分析:由0,0,lg2lg8lg2x y x y >>+=得+31x y =,11+3+33=+=1++1+2+2333x y x y y xx y x y x y+≥=4. 考点:基本不等式.【方法点睛】不等式是高中数学的重要内容之一,利用均值不等式求最值以及证明不等式是重中之重.有关利用基本不等式求最值的问题,有时必须使用1的代换来解决,可以大大简化运算.利用基本不等式求最值,需要注意三点:①利用时的条件:必须是正;②注意等号取得的条件;③一般情况下,连续使用基本不等式,需要慎重(主要是等号成立的条件可能会不一致). 11.B【解析】试题分析:由离心率为2,得2c a =,即2c a =,b =,又过点()2,3,得224913a a-=,解得21a =,244c a ==,故选项为B. 考点:双曲线的性质. 12.C 【解析】试题分析:由11n a b b c a c +≥---恒成立,则a c a c n a b b c --≤+--恒成立,即a c a cn a b b c --≤+--的最小值,由a c a c a b b c --+--24a b b c a b b c b c a ba b b c a b b c -+--+---=+=++≥----,得4n ≤,故选C.考点:基本不等式.【易错点晴】本题考查不等式的恒成立问题及基本不等式,意在考查考生的化归与转化思想、逻辑思维能力及运算求解能力,属中档题.本题通过分离常数利用基本不等式求函数的最值,问题转化为a c a c n ab bc --≤+--恒成立,即a c a c n a b b c --≤+--的最小值,然后将a c a ca b b c --+--化为2a b b c a b b c b c a b a b b c a b b c -+--+---=+=++----,而后利用基本不等式求最小值,利用基本不等式时一定注意条件:一正、二定、三相等,否则容易出错. 13. 【解析】试题分析:点代入函数得:,所以,所以。
项城市第三高级中学2016-2017学年第一学期语文周练试题时间:150分钟分数:150分第I 卷阅读题一、现代文阅读(9 分,毎小题 3 分)谣言为什么不缺受众谣言从来不是新鲜事。
马克·吐温曾说:“当真相还在穿鞋的时候,谣言就已经跑遍半个地球了。
”在100多年后的今天,技术的进步让谣言跑得更快、传得更远了。
相关研究显示,微信平台的活跃用户数量已超过6亿,作为一个相对封闭的圈子,微信中的联系人多是同事、朋友等平日里打过交道、联系较为紧密的人,当现实关系延伸到网络的虚拟空间中,每一条转发显得更具说服力,也更容易被再次转发扩散。
《小龙虾是一种处理过尸体的虫子,外国人从不吃》《肯德基的鸡都长着六个翅膀》《人社部渐进式延迟退休年龄时间表》……这些看着眼熟的文章是不是曾经在你的微信朋友圈出现过?在微信公众平台辟谣中心,类似已辟谣的文章达280148篇,而2015年微信朋友圈谣言的举报处理总量达到21695437次。
微信官方推出的公众号“谣言过滤器”将谣言分为七类,分别为失实报道、儿童走失、财产安全、食品安全、人身安全、科学常识、迷信。
数据显示,2015年失实报道所占比例最高,达到了29%,而排名第二、第三的分别为食品安全(20%)与人身安全(12%)。
《倒着输银行卡密码能自动报警》《长期喝豆浆会致乳腺癌》等入选年度十大谣言,举报次数最多的《微信朋友圈降权》达到了233210次。
很多人疑惑,许多诸如“六个翅膀的鸡”等谣言明明漏洞百出,为何还是有很多人愿意相信甚至反复传播?在不少专家看来,网络推手和商业营销是部分谣言产生和传播的一股重要力量。
但从受众心理角度分析,猎奇心理是谣言传播的最普遍的原因之一。
新浪微博相关负责人尹雪赓分析认为:“从传播规律来看,人们更关注新奇、颠覆常识的讯息,出于这样的心理,谣言也就更容易得到传播。
”失实报道之所以能成为微信朋友圈中的谣言主力,一定程度上就是因为满足了不少人的猎奇心理。
高三上学期第五次周考语文试题(2016、10、22)一、(40分,每题5分)1、下列句子中,划线成语使用恰当的一句是( )A.目前,中学生作文中错别字俯拾即是,改变这种现状是语文教学的重要任务之一。
B.曾几何时,十年寒窗磨剑,到头来,看到成堆的稿纸难以变成铅字,他内心无比痛苦。
C.某市教委删除了中学生守则中“节俭”和“谦虚”的内容,对此人们街谈巷议,褒贬不一。
D.在人代会上,人大代表一致认为,政府应名正言顺地加大对农村教育的投入.2、下列句子中,语意明确、没有语病的一句是()A.在北京举办了古埃及第一个文物展览,此次展览有143件埃及国宝级文物集体亮相北京。
B.一个民族可以用刀剑,或者用弓矢打败另一个民族;但是要征服一个民族的灵魂,却绝非单凭刀枪剑矢就能做到的。
C.虽然互联网给我们带来了不少交流、商务、购物上的便利,但是我们对网上信息的真实性和安全性越来越感到质疑.D.在对“建始人”古人类化石进行考证研究后,我国考古专家认为:“建始人”化石,对人类起源于非洲的学说是一个挑战。
3、根据上下文,填写在横线上的语句最恰当的一项是()鸽子是这城市的精灵.__________在它们眼里,收进了多少秘密呢?A.它们是惟一的俯瞰这城市的活物,有谁看这城市有它们看得清晰和真切呢?每天早晨,有多少鸽子从连绵的屋顶上飞向天空! B.每天早晨,有多少鸽子从连绵的屋顶上飞向天空!它们是惟一的俯瞰这城市的活物,有谁看这城市有它们看得清晰和真切呢? C.它们是惟一的俯瞰这城市的活物,每天早晨,有多少鸽子从连绵的屋顶上飞向天空!有谁看这城市有它们看得清晰和真切呢? D.每天早晨,有多少鸽子从连绵的屋顶上飞向天空!有谁看这城市有它们看得清晰和真切呢?它们是惟一的俯瞰这城市的活物。
4.下面四句话的空缺处依次填入成语,最恰当的一组是()①只有与国家和人民________,把个人荣辱置之度外的人才会得到人民的口碑,得到人民的拥戴.②日本安倍政府近期的荒唐行径,表现出日本军国主义大有________之势,这极大地伤害了亚洲邻国人民的感情.③陈教练当时就断定,只要假以时日,韩晓鹏一定会有让人________的那一天。
致远中学2016-2017学年度上学期高三第三周语文周测试卷一、现代文阅读(20)阅读下面的文字,完成下题。
感恩节的荆棘花束迎着十一月的寒风,推开街边一家花店大门的时候,珊德拉的情绪低落到了极点。
一直以来,她都过着一帆风顺的惬意生活。
但是今年,就在她怀孕4个月的时候,一场交通事故无情地夺走了她肚子里的小生命。
紧接着,她的丈夫又失去了工作。
这一连串的打击令她几乎要崩溃了。
“感恩节?为什么感恩呢?为了那个不小心撞了我的粗心司机?还是为那个救了我一命却没能帮我保住孩子的气囊?”珊德拉困惑地想着,不知不觉中来到一团团鲜花面前。
“我想订花……”珊德拉犹豫着说。
“是感恩节用的吗?”店员问,“您一定想要那种能传递感激之情的花吧?”“不!”珊德拉脱口而出,“在过去的五个月里,我没有一件事是顺心的。
”“我知道什么对您最合适了。
”店员接过话来说。
珊德拉大感惊讶。
这时,花店的门铃响了起来。
“嗨,芭芭拉,我这就去把您订的东西给您拿过来。
”店员一边对进来的女士打着招呼,一边让珊德拉在此稍候,然后就走进了里面的一个小工作间里。
没过多久,当她再次出来的时候,怀里抱满了一大堆的绿叶、蝴蝶结和一把又长又多刺的玫瑰花枝——那些玫瑰花枝被修得整整齐齐,只是上面一朵花也没有。
珊德拉狐疑地看着这一切,这不是在开玩笑吧?谁会要没有花的枝子呢!她以为那顾客一定会很生气,然而,她错了。
她清楚地听到那个叫芭芭拉的女人向店员道谢。
“嗯,”珊德拉忍不住开口了,声音变得有点结结巴巴的,“那女士带着她的……嗯……她走了,却没拿花!”“是的,”店员说道,“我把花都给剪掉了。
那就是我们店里的特别奉献,我把它叫做感恩节的荆棘花束。
”“哦,得了吧,你不是要告诉我居然有人愿意花钱买这玩意吧?”珊德拉不理解地大声说道。
“3年前,当芭芭拉走进我们花店的时候,感觉就跟你现在一样,认为生活中没有什么值得感恩的。
”店员解释道,“当时,她父亲刚刚死于癌症,家族事业也正摇摇欲坠;儿子在吸毒,她自己又正面临一个大手术。
2017届高三语文第六次周考一、语言文字运用(共14分)1.下列句子中,没有语病的一项是(3分)A.过劳为什么会引起健康透支?有关专家认为,最严重的问题不是加班,而是巨大的压力导致休息时间也无法彻底放松心情所致。
B.茅于轼强调,我们虽然一直以来受的教育都是劳动创造财富,但在市场经济下,交换才是财富产生的途径,每一次交换都把一个物品从低价格提升到高价格,交换使其物尽其用。
C.尊重生命不仅是对人而言,天地间所有生命和造物主所有的恩惠都应该受到关爱和尊重。
D. 有关商品房质量的投诉,这些年一直居高不下,原因之一就是目前建设中大量采用的现场浇铸施工工艺使得施工质量难以控制。
2.下列各句中,没有语病的一句是(3分)A.人生就像一杯白开水,平平淡淡的;但又像一杯加了糖的白开水,甜甜的;也像一杯加了盐的白开水,咸咸的。
B.11月份以来,我国大部分地区尤其是北方的一些地区遭到了雨雪的袭击,温度下降得非常快,这给当地民众的生活和工作带来了很多不便。
C.有市民认为,如果票价过高,无法令普通打工者承受,这趟动车组将有可能变成“白领专列”。
D.晚会上的《华阴老腔一声喊》节目选取了中国传统民乐与西方现代摇滚音乐相结合为道路,获得了更广泛的受众的喜爱。
3.下列各句中加点词语的使用,正确的一项是(3分)A.司马迁推崇孔子,却没把孔子的每句话都当作清规戒律....,这一点值得我们借鉴。
B.以每个人分发一百元钱然后遣散的方式来应付民工集中追索欠款,这种作为只能是扬汤..止沸..对解决问题毫无帮助。
C.伴随经济的飞速发展,中国传统文化正在全面回归和复兴,过去境遇冷落的原生态民族民间歌舞,开始大模大样....登上舞台。
D. “憧憬”一词中的“憧”字读音为“chōng”,这连许多小学生都能读准的字却被一位所谓的专家读成“zhuàng”,真是不.可理喻...。
4.下列各句中加点词语的使用,全都正确的一项是(3分)①大学生走出象牙之塔....,参加社会实践活动,置身坚实的土地.贴近农民的心,才能真切体会舒适的生活多么来之不易。
山西省怀仁县第一中学2017届高三上学期期中考试(文)数学试卷答 案1~5.CBCCB 6~10.BACAA 11~12.CD 13.1 14.(1,)-+∞ 1516.(3)(4)17.(1)因为3,1,1()|21||1|2,1,213,,2x x f x x x x x x x ⎧⎪-≤-⎪⎪=-++=-+-<<⎨⎪⎪≥⎪⎩且(1)(1)3f f =-=,所以()3f x <的解集为{|11}x x -<<.………………5分(2)|2||1||||1||||1|0|1|2222a a a ax a x x x x -++=-+++-≥++=+, 当且仅当(1)()02a x x +-≤且02ax -=时,取等号.所以|1|12a+=,解得4a =-或0.………………10分18.(1)如题图,在△ABC 中,由余弦定理,得222cos 2AC AD CD CAD AC AD+-∠=⋅故由题设知,cos CAD ∠==.………………4分(2)如题图,设BAC a ∠=,则a BAD CAD =∠-∠.因为cos 7CAD ∠=,cos 14BAD ∠=所以sin CAD ∠=sin BAD ∠===. 于是sin sin()a BAD CAD =∠-∠sin cos cos sin BAD CAD BAD CAD =∠∠-∠∠()1471472=--⨯=. 在ABC ∆中,由正弦定理,得sin sin BC ACa CBA=∠.故sin 3sin AC a BC CBA ==∠.………………12分 19.(1)∵2112333+3,3…①n n na a a a -+++=∴113a =.212311333(2),3②n n n a a a a n -+-+++=≥L-1113(2),333①②,得n n n n a n --=-=≥化简得1(2)3n n a n =≥.显然113a =也满足上式,故1()3*N n n a n =∈.………………………6分(2)由(1)得3nn b n =⋅,于是231323333nn S n =⨯+⨯+⨯++⋅L ,③234131323333n n S n +=⨯+⨯+⨯++⋅L ,④③-④得231233333n n n S n +-=+++++⋅L ,即11332313n n n S n ++--=-⋅-,∴1213344n n n S +-=⋅+.………………12分 20.(1)由题意得2()2sin cos sin 22sin(2)3f x x x x x x x πωωωωωω=+==-,由最小正周期为π,得1ω=,所以()2sin(2)3f x x π=-.函数的单调增区间为222,232-≤-≤+∈Z k x k k πππππ,整理得5,1212-≤≤+∈Z k x k k ππππ, 所以函数()f x 的单调增区间是5[,],1212-+∈Z k k k ππππ.………………6分 (2)将函数()f x 的图像向左平移6π个单位,再向上平移1个单位, 得到2sin 21y x =+的图像,所以()2sin 21g x x =+.令()0g x =,得712x k ππ=+或11()12=+∈Z x k k ππ. 所以在[0,]π上恰好有两个零点,若()y g x =在[0,]b 上有10个零点,则b 不小于第10个零点的横坐标即可,即b 的最小值为115941212πππ+=.………………12分 21.(1)当1a =时,2()ln 1,f x x x x=++- 此时21212()1,(2)1124f x f x x ''=+-=+-=.又因为2(2)ln 221ln 22,2f =++-=+所以切线方程为2(ln 2)2,y x -+=-整理得ln 20.x y -+=…………………4分(2)2222111(1)(1)'()a ax x a ax x x f x a x x x x++--++-=+-==, 当0a =时,21'()x f x x-=.此时,在(0,1)上,'()0f x <,()f x 单调递减;在(1,)+∞上,'()0f x >,()f x 单调递增.当102a -≤<时,21()(1)'()a ax x a f x x++-=. 当11a a +-=,即12a =-时,22(1)'()2x f x x -=-在(0,)+∞上恒成立,所以()f x 在(0,)+∞上单调递减. 当102a -<<时,11a a +->,此时在(0,1)或1(,)aa +-+∞上,'()0f x <,()f x 单调递减; 在1(1,)aa+-上,'()0f x >,()f x 单调递增. 综上,当0a =时,()f x 在(0,1)上单调递减,在(1,)+∞上单调递增;当102a -<<时,()f x 在(0,1)或1(,)a a +-+∞上单调递减,在1(1,)aa+-上单调递增; 当12a =-时,()f x 在(0,)+∞上单调递减.………………12分22.(1)由题意,得2()ln 20g x x x x ax =+++=在(0,)+∞上有实根,即2ln a x x x -=++在(0,)+∞上有实根. 令2()ln x x x xφ=++,则22221221'()1(2)(1)x x x x x x x x xφ+-=+-==+-.易知,()x φ在(0,1)上单调递减,在(1,)+∞上单调递增,所以min ()(1)3a x φφ-≥==,3a ≤-.故a 的最大值为3-.………………6分(2)∵0x ∀>,2()1f x x kx x≤--恒成立, ∴2ln 1x x kx ≤--,即21(1ln )k x x x≤--.令()1ln g x x x =--,0x >.11'()1x g x x x-=-=. 令'()0g x >,解得1x >,∴()g x 在区间(1,)+∞上单调递增; 令'()0g x <,解得01x <<,∴()g x 在区间(0,1)上单调递减. ∴当1x =时,()g x 取得极小值,即最小值,∴()(1)0g x g ≥=, ∴0k ≤,即实数k 的取值范围是(,0]-∞.山西省怀仁县第一中学2017届高三上学期期中考试(文)数学试卷解 析1.2.试题分析:220x a a x -≤⇔≥,因为2[1,4)x ∈得4a ≥,故4a >是其的一个充分不必要条件.选B . 考点:充分条件;必要条件.3.试题分析:由3544(1)a a a =-得23444421114(1),2,8,2,2a a a a q q a a q a =-∴=∴==∴=∴==.故选C . 考点:等比数列的性质.4.试题分析:000sin35cos55sin35,sin35cos35b c ===>,所以a b c <<,故选C . 考点:正弦函数的单调性.5.6.试题分析:因为2221cos212sin ,12sin ,sin ,sin 2a x x a x x x -=-∴=-∴=∴=故选B . 考点:二倍角公式.7.试题分析:''()cos sin ,(0)1,4x x f x e x e x k f πα=-∴==∴=,故选A .8.9.试题分析:由22211sin ,21,2cos 25,522S ac B c b a c ac B b =∴=⨯∴==+-=∴=,故选A . 10.试题分析:|3||3|11y x x y y ≥-⎧-≤≤⇔⎨≤⎩其图形如图所示,221x y z z y x x y z +-=⇒=+-,由图形知2150,2123z z z -≤≤∴≥≥-,故选A .11.12.13.试题分析:由题知函数恒过点(1,1),可得1140m n +-=,114m n∴+=. 111111()4()()(2)(22)14444n m m n m n m n m n m n +=+⨯⨯=++=++≥⨯+=.14.试题分析:令''()()24,()()20g x f x x g x f x =--∴=->,所以()g x 在R 上增函数,且(1)(1)2(1)40g f -=--⨯--=,由()(1)g x g >-得1x >-,故不等式的解集为(1,)-+∞.考点:函数的单调性与导数;构造函数.15.16.17.考点:绝对值不等式的性质;分段函数解不等式. 18.19.20.21.考点:导数的几何意义;函数的单调性与导数.22.。
完整版2017届高考英语阅读理解——记叙文真题训练含--WORD格式 -- 可编写 -- 专业资料 ------2017届高三英语——阅读理解记述文2016 I 卷CI am peter Hodes, a volunteer stem cell courier. Since March 2012, I'vedone 89trips of those , 51 have been abroad, I have 42 hours to carry stem cells(干细胞) inmy little box because I've got two ice packs and that's how long they last, inall, fromthe time the stem cells are harvested from a donor(捐赠者 ) to the time theycan beimplanted in the patient, we’ ve got 72 hours at most, So I am always conscious of time.I had one trip last year where I was caught by a hurricane in America.I picked upthe stem cells in Providence, Rhode Island, and was meant to fly toWashington thenback to London. But when I arrived at the check-in desk at Providence,the lady onthe desk said:some’vebadgot news for you-there are Well, ” I’ m really sorry, I nofights from Washington. So I”took my box and put it on the desk and I said:“In thisbox are some stem cells that are urgently needed for a patient-please, please,you’ vethe Kingdom. ”She just dropped everything.got to get me back to United Shearranged for a flight on a small plane to be held for me, re-routed(改道 )me through Newark and got me back to the UK even earlier than originally scheduled.For this courier job, you’ reconsciously aware that in that box you’vegotsomething that is potentially going to save somebody’ s life.完整版2017届高考英语阅读理解——记叙文真题训练含29.Which of the following can replace the underlinedword A providerB delivery manC collectorD medical doctor30.Why does Peter have to complete his trip within 42 hours?A.He cannot stay away from his job too long.B.The donor can only wait for that long.C.The operation needs that much time.D.The ice won't last any longer. “ courie ” inr Paragrap-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------31.Which flight did the woman put Peter on first?A.To LondonB.To NewarkC.To ProvidenceD.To Washington2015I卷BThe freezing Northeast hasn’ t been a terribly fun place to spend time this winter, so when the chance came for a weekend to Sarasota, Florida, my bags were packedbefore you could say “ sunshine ” . I left for the land of warmth andvitamin 维生素 C( C), thinking of beaches and orange trees. When wetouched down to blue skies and1-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------warm air, I sent up a small prayer of gratefulness. Swimming pools, winetasting, and pink sunsets(at normal evening hours, not 4 in the afternoon)filled the weekend, butthe best part-particularly to my taste, dulled bymonths of cold-weather rootvegetableswas- a 7 a.m. adventure to the Sarasota farmers’ market that proved to be more than worth the early wake-up call.The market, which was founded in 1979, sets up its tents every Saturday from 7am to 1 p.m, rain or shine, along North Lemon and State streets. Baskets of perfectred strawberries, the red-painted sides of the Java Dawg coffee truck; and most ofall,the tomatoes: amazing, large, soft and round red tomatoes.Disappointed by many a broken, vine-ripened(蔓上成熟的) promise, I’ ve refusedto buy winter tomatoes for years. No matter how attractive they look in the store, onceI get them home they’re unfailingly dry, hard, and tasteless. But I homed in, withuncertainty, on one particular table at the Brown’ s Grove Farm’ s stand, full of fresand soft tomatoes the size of my fist. These were the real deal- and at thatmoment, I realized that the best part of Sarasota in winter was going to beeating things that back home in New York I wouldn’ t be experiencing againfor months.Delighted as I was by the tomatoes in sight, my happiness deepenedwhen I learned that Brown’ sGrove Farm is one of the suppliers for JackDusty, a newly opened restaurant at the Sarasota Ritz Carlton, where-luckilyfor me-I was planning to have dinner that very night. Without even seeing themenu, I knew I’ dbe ordering every tomato on it.24.What did the author think of her winter life in New York?A.Exciting.完整版2017届高考英语阅读理解——记叙文真题训练含B.Boring.C.Relaxing.D.Annoying.25.What made the author’ s getting up early worthwhile?A.Having a swim.B.Breathing in fresh air.C.Walking in the morning sun.D. Visiting a local farmer market’s.26.What can we learn about tomatoes sold in New York in winter?A. They are soft.-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------B.They look nice.C.They taste great.D.They are juicy.27.What was the author going to do that evening?A.Eat in a restaurant.B.Check into a hotel.C.Go to a farm.D.Buy fresh vegetables.2-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------2014I卷BPassenger pigeons(旅鸽)once flew over much of the United States in unbelievable numbers. Written accounts from the 18th and 19thcenturies describedflocks (群) so large that they darkened the sky for hours.It was calculated that when its population reach its highest point, therewere morethan 3 billion passenger pigeons –a number equal to 24 to 40 percent of the total birdpopulation in the United States, making it perhaps the most abundant birds in theworld. Even as late as 1870 when their numbers had already become smaller, a flock believed to be 1 mile wide and 320 miles (about 515 kilometers) long was seen near Cincinnati.Sadly, the abundance of passenger pigeons may have been their undoing.Where the birds were abundant, people believed there was an ever-lasting supplyand killed them by the thousands. Commercial hunters attracted themto small clearings with grain, waited until pigeons had settled to feed,then threw large nets over them, taking hundreds at a time. The birdswere shipped to large cities and sold in restaurants.thBy the closing decades of the 19 century, the hardwood forests where passenger pigeons nested had been damaged by Americans ’ need for wood, which (驱 scattered散) the flocks and forced the birds to go farther north, where cold temperatures and spring storms contributed to their decline. Soon the great flocks were gone, never to be seen again.In 1897, the state of Michigan passed a law prohibiting the killing of passenger pigeons, but by then, no sizable flocks had been seen in the state for 10 years. The lastconfirmed wild pigeon in the United States was shot by a boy in Pike County, Ohio, in 1900. For a time, a few birds survived under human care. The last of them, known affectionately as Martha, died at the Cincinnati Zoological Garden in September 1, 1914.t th h24. In the and early1819centuries, passenger pigeons _______.A. were the biggest bird in theworldB. lived mainly in the south of America-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------C. did great harm to the natural environmentD. Were the largest population in the US25.The underlined word“ undoing” probably refers to the pigeons’ _______.A. escapeB. ruinC. liberationD. evolution26.What was the main reason for people to kill passenger pigeons?A. To seek pleasure.B. To save other birds.C. To make money.D. To protect crops.27.What can we infer about the law passed in Michigan?A. It was ignored by the public.B. It was declared too late.C. It was unfair.D. It was strict.3-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------2016 II卷DA new collection of photos brings an unsuccessful Antarctic voyage back to life.Frank Hurley’ spictures would be outstanding----undoubtedly first-ratephoto-journalism---if they had been made last week. In fact, they were shotfrom 1914 through 1916, most of them after a disastrous shipwreck(海滩), by a cameraman who had no reasonable expectation of survival. Many ofthe images were stored in an ice chest, under freezing water, in thedamaged wooden ship.The ship was the Endurance, a small, tight, Norwegian-built three-masterthat was intended to take Sir Ernest Shackleton and a small crew of seamenand scientists, 27 men in all, to the southernmost shore ofAntarctica ’Weddells Sea. From that pointShackleton wanted to force a passageby dog sled(雪橇) across the continent. The journey was intended to achieve more than what Captain Robert Falcon Scott had done. Captain Scott had reached the South Pole early in 1912 but had died with his four companions on the march back.As writer Caroline Alexander makes clear in her forceful and well-researched story The Endurance, adventuring was even then a thoroughlycommercial effort. Scott’ s last journey, completed ashe lay in a tent dyingof cold and hunger, caught the world’imagination,s and a film made in his honor drew crowds. Shackleton, a onetime British merchant-navy officerwho had got to within 100 miles of the South Pole in 1908, started abusiness before his 1914 voyage to make money from movie and stillphotography. Frank Hurley, a confident and gifted Australian photographerwho knew the Antarctic, was hired to make the images, most of whichhave never before been published.13.What do we know about the photos taken by Hurley?A.They were made last weekB.They showed undersea sceneriesC.They were found by a cameramanD.They recorded a disastrous adventure14.Who reached the South Pole first according to the text?A.Frank HurleyB.Ernest ShackletonC.Robert Falcon ScottD.Caroline Alexander15.What does Alexander think was the purpose of the 1914 voyage?A.Artistic creationB.Scientific research-- 完好版学习资料分享------WORD格式 -- 可编写 -- 专业资料 ------C.Money makingD.Treasure hunting4-- 完好版学习资料分享----。
高三教学质量检测考试文科数学2016.11本试卷分为选择题和非选择题两部分,共5页,满分150分。
考试时间120分钟. 注意事项:1.答题前,考生务必用直径0.5毫米黑色墨水签字笔将自己的姓名、准考证号、县区和科类填写在答题卡上和试卷规定的位置上.2.第I 卷每小题选出答案后,用2B 铅笔把答题卡上对应题目的答案标号涂黑;如需改动,用橡皮擦干净后,再选涂其他答案标号,答案不能答在试卷上。
3.第Ⅱ卷必须用0.5毫米黑色签字笔作答,答案必须写在答题卡各题目指定区域内相应的位置,不能写在试卷上;如需改动,先划掉原来的答案,然后再写上新的答案;不能使用涂改液、胶带纸、修正带。
不按以上要求作答的答案无效.第I 卷 (共50分)一、选择题:本大题共10小题,每小题5分,共50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.设集合{}(){}1,0,1,2,110M N x g x M N =-=+>⋂=,则(A){}01, (B) {}012,, (C) {}1,2 (D) {}101-,,2.命题“()00,x ∃∈+∞,使00ln 2x x =-”的否定是(A) ()0,,ln 2x x x ∀∈+∞≠-(B) ()0,,ln 2x x x ∀∉+∞=-(C) ()0000,,ln 2x x x ∃∈+∞≠-使(D) ()0000,,ln 2x x x ∃∉+∞=-3.下列函数中,既是偶函数又在区间()0,+∞上单调递增的是 (A) 1y x= (B) 1y g x = (C) cos y x = (D) 22x y x =+4.下列命题为真命题的是(A)命题“若x y >,则x y >的逆命题(B)命题“若211x x ≤≤,则”的否命题 (C)命题“若210x x x =-=,则”的否命题 (D)命题“若11a b a b><,则”的逆否命题 5.已知向量()()()1,,0,2,a m b a b b m ==-+⊥且,则等于(A) 2- (B) 1- (C)1 (D)26.已知函数()()121,1,3log ,1,xx f x f f x x ⎧⎛⎫≤⎪ ⎪⎪⎝⎭==⎨⎪>⎪⎩则 (A) 12- (B) 12(C)(D)3 7.某几何体的三视图如图所示,且该几何体的体积是3,则正视图中的x 的值是 (A) 56(B)2 (C) 52 (D)3 8.已知函数()()()sin 0,0f x A x b A ωϕω=++>>的图象如图所示,则()f x 的解析式为(A) ()2sin 263f x x ππ⎛⎫=++ ⎪⎝⎭ (B) ()13sin 236f x x π⎛⎫=-+ ⎪⎝⎭ (C) ()2sin 366f x x ππ⎛⎫=++ ⎪⎝⎭ (D) ()2sin 363f x x ππ⎛⎫=++⎪⎝⎭9.函数()3x y x x e =-的图象大致是10.已知()f x 是定义在()0,+∞上的函数,()()f x f x '是的导函数,且总有()()f x xf x '>,则不等式()()1f x xf >的解集为(A) (),0-∞ (B) ()0,1 (C) ()0,+∞ (D)(1,+∞)第Ⅱ卷 (共100分)二、填空题:本大题共5个小题,每小题5分,共25分。
朱河中学2017届高三年级第一次周考英语试题(满分150分,考试时间120分钟,请将答案填写在答题卡上)第一部分听力(共两节,满分30分)第二部分阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
AEveryone wants to have a healthy heart. Still, heart diseases affect more than 1 in 3 adults in the United States. The good news is that some simple, everyday habits can make a big difference in your ability to live a healthy lifestyle. Here are some worst habits for your heart, and how to avoid them.Watching TVSitting for hours on end increases your risk of heart attack and stroke(中风),“some exercise doesn’t make up for the time you sit,” says Harmony R. Reynolds, Why? The lack of movement may affect blood levels of fats and sugars. Dr. Reynolds advises walking around regularly and, i f you’re at work, standing up to talk on the phone. Leaving hostility and depression uncheckedAre you feeling stressed or sad? It can do harm to your heart. While everyone feels this way some of the time, how you handle these emotions can affect your heart health.“Those with stress are in greater danger; research has shown a benefit to laughter and social support,” Dr. Reynolds says. “And it’s helpful to be able to go to someone and talk about your problems.”Cutting off from the worldIt's no secret that on some days, other human beings can seem annoying and too difficult to get along with. However, it makes sense to strengthen your connections to the ones you actually like. People with stronger connections to family, friends, and society in general tend to live longer, he althier lives. Everyone needs alone time, but you should still reach out to others and keep in touch whenever you can.Drinking (too much) alcoholSure, studies suggest a small amount of alcohol may be good for your heart. However, too many of us drink over. Too much alcohol is linked to a greater risk of high blood pressure, high levels of blood fats, and heart failure.21.Watching TV for a long time may ______________.A.help you live a healthy life B.lead to heart attackC.mak e up for the time you sit D.make you feel stressed22.Which of the following is bad for those with stress and sadness?A.Laughing a lot B.Talking about their own problems.C.Getting social support D.Leaving these emotions alone.23.If you want a long healthy life, you should____________.A.cut off from the world B.get along well with othersC.stay alone as much as possible D.drink no alcohol24.From the passage we can infer that _____________.A.some everyday habits can help avoid heart attacksB.standing up to talk on the phone is not a good ideaC.it’s easy to strengthen your connections to othersD.too much alcohol is not linked to heart failBAnyone who has experienced the joy of driving through a rainstorm with the sunroof (天窗) open understands how airflow around the moving vehicles can keep him dry despite the exposure. Now a similar principle is being employed to create an umbrella that protects people from the rain using nothing more than an invisible air force field.Air Umbrella, developed by a Chinese company and recently funded by Kickstarter, uses forced air rather than fabric to create a protective canopy that keeps people from getting wet in the rain.It’s a clever concept and designers h ave done a good job of answering several questions about the product. For instance, the sound generated by the device is minimal, especially when compared to the pitter-patter of the falling rain. It can create a protective canopy wide enough for two people to fit under and it performs well even in the heavy rain. The air shield (防护) can be cut through by high winds, but given that regular umbrellas typically fold over in similar windy conditions, the air umbrella is still an upgrade.A few concerns do remain, however. For instance, the battery life is only about 15-30 minutes depending on the model, so you’ll still want to walk briskly to your next destination when it’s raining. Also, while the air shield might keep the rain away from you, it’s likely to sp lash all that blown-away water onto anyone else like a sprinkler(洒水车). So the device might draw the ire of anyone else walking with you, or any helpless bystanders.There are currently three different types to choose from if you’re interested in investing. Air Umbrella-A is the lightest model, and is apparently designed specifically for females, according to the Chinese developers. It is about 12 inches in length and weighs a little over a pound, and it runs for 15 minutes per charge. Air Umbrella-B measures nearly 20 inches long and weighs 1.7 pounds, and lasts 30 minutes per charge. Finally, Air Umbrella-C also lasts 30 minutes, but is scalable between 20 and 32 inches depending on your needs.25. Why does the author mention a special driving experience in the first paragraph?A. To introduce the topic of the passage.B. To explain the need for an umbrella.C. To share a feeling with the readers.D. To prove a theory to the readers.26. The Air Umbrella fails to work when ______.A. there is little rainB. there is no windC. it rains heavilyD. the wind is strong27. How does the author present concerns about the Air Umbrella?A. By giving figures.B. By giving examples.C. By making experiments.D. By making comparisons.28. The underlined word “ire” in the 4th paragraph probably means ______.A. attentionB. doubtC. curiosityD. angerCFrancis Scott Key Fitzgerald was born on September 24, 1896. He was an American writer of novels and short stories, whose works are the typical writings of the Jazz Age, a term he created himself.Born into an upper middle-class Irish Catholic family, Fitzgerald was named after his famous second cousin, Francis Scott Key. He was also named after his deceased sister Louise Scott, one of two sisters who died shortly before his birth. He spent 1898–1901 in Syracuse and 1903–1908 in Buffalo, New York, where he attended Nardin Academy. When his father was fired from his company, the family returned to Minnesota, where Fitzgerald attended St. Paul Academy from 1908 to1911.He is widely regarded as one of the 20th century’s greatest writers. Fitzgerald is considered to be a member of the “Lost Generation” of the 1920s. He finished four novels, This Side of Paradise, The Beautiful and Damned, Tender Is the Night and his most famous classic novel, The Great Gatsby. A fifth, unfinished novel, The Love of the Last Tycoon was published after his death. Fitzgerald also wrote many short stories that dealt with themes of youth.His first literary work, a detective story, was published in a school newspaper when he was 12. When he was16, he was forced to leave St. Paul Academy for neglecting his studies. He attended Newman School, a prep school in Hackensack, New Jersey, in 1911–1912, and entered Princeton University in 1913 as a member of the Class of 1917. There he became friends with future critics and writers Edmund Wilson (Class of 1916) and John Peale Bishop (Class of 1917), and wrote for the Princeton Triangle Club. He was also a member of the University Cottage Club, which still displays Fitzgerald’s desk and writing materials in its library. A poor student, Fitzgerald left Princeton to enlist (入伍) in the US Army during World War I; however, the war ended s hortly after Fitzgerald’s enlistment.Fitzgerald had been an alcoholic (酒鬼) since his college days, leaving him in poor health by the late 1930s. Fitzgerald suffered a mild attack of tuberculosis in 1919, and died of a heart attack in 1940.29. What does the passage mainly talk about?A. The “Lost Generation” of the 1920s.B. How Fitzgerald got his name.C. The life and works of Fitzgerald.D. Fitzgerald and the Jazz Age.30. What led to Fitzgerald’s early death according to the passage?A. His poverty.B. His heavy drinking.C. The poor working conditions.D. The pressures of work.31. Which is the most famous work of Fitzgerald?A. This Side of Paradise.B. The Beautiful and Damned.C. Tender Is the Night.D. The Great Gatsby.32. What’s the right order of the events related to Fitzgerald?a. He attended Nardin Academy.b. He entered Princeton University.c. He attended St. Paul Academy.d. He joined the US Army during World War I.A. a,c,b,dB. a,d,b,cC. b,d,a,cD. b,a,c,dDLast Christmas, when I was in the fourth grade and my brother was in the first grade, our school held its yearly Holiday Shop. At the Holiday Shop students can buy things like necklaces, key chains, and other small items for their friends and family as Christmas gifts. Since my brother really wanted to take part, my mom gave him two dollars to buy his Christmas gifts.My mom didn’t know that he had picked out a special necklace for her. When he got home from the HolidayShop that day, he couldn’t wait to show it to me. He pulled out a little green box and opened it. Inside was a gold chain with a little red flower and a man-made diamond next to gold letters that spelled out,“Grandmother”.“Wow,” I said.“It’s beautiful.” Since my brother was in the first grade and was just learning to read, he didn’t realize that the necklace said “Grandmother” instead of “Mother”. I knew that on Christmas morning, when he found out he had bought the wrong necklace, he would be very unhappy, so I said nothing more about it. My brother ran and put the necklace under his bed to hide it from Mom until Christmas morning.When he wasn’t looking, I took the necklace and put it in my backpack. The next day I took it back to school and asked the woman who ran the Holiday Shop if I could change it for the “Mother” necklace. She said yes. When I got home that day, I put the necklace under my brother’s bed.When my mom opened it up on Christmas morning, my brother was so exalted! My mom’s eyes were filled with joy. She knew what had happened, which made the necklace even more special to her!My brother still does not know what I did, but I knew I had done the right thing.33. What do we know about the gift the author’s brother boughtA. The author didn’t like it.B. It wasn’t worth the price.C. It was designed for Mother.D. The author changed it for another one.34. The underlined word “exalted” is the closest in meaning to “______”.A. amazedB. disappointedC. excitedD. worried35. It can be inferred from the text that _____.A. the author’s mother didn’t know what she had doneB. the author helped her brother secretlyC. the author’s grandma also received a giftD. the author paid for the right necklace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入空白处的最佳选项。
襄州区一中2017届高三周考语文试题(2)注意:请将1--23题涂在答题卡上一、语文基础知识(每题3分,共60分)1、下列各句中加点词语的使用,全都正确的一项是()①当前,全国正在努力倡导“大众创业,万众创新”。
应该说,作为寒窗苦读的大学生毅然去创业,无可非议....。
但要摆摊卖烤脑花,就值得商榷了。
②虽然不少通信运营商信誓旦旦地保证,其营业点将确保通信业务中关键的私人信息不会被泄露,然而事实却是差强人意....的。
③前天晚上地铁里遭遇拥挤,昨日“海上世界”也是人满为患....,在回来的路上,走望海路堵车,由望海路拐向滨海路也堵车,拥挤不堪的道路让人心烦。
④电视剧《琅琊榜》因故事生动曲折而热播不断,一度达到万人空巷....的地步,该剧也因此成了近几年来少有的经典之剧。
⑤我们的先哲中不乏画“○”高手,他们用自己美轮美奂....的画,诠释着生命的意义、生命的美。
⑥自2015年6月起,经过三个月的改造,仁和花园焕然一新....。
如今,小区活动广场内篮球场、健身器材、桌椅等一应俱全。
A.①②④B.①③⑥C.②⑤⑥D.③④⑤2、下列各句中加点成语的使用,全都正确的一项是( )①在城镇化的时代背景下,拯救濒危的传统工艺美术品,促进传统工艺美术产业的振兴已经迫在眉睫....,不能再拖延下去了。
②弘人民利益为重是我党的宗旨,各级领导干部应该坚持以民为本的原则,上行下效....,全力推动社会各项事业的持续健康发展。
③适当运用古词语,可以使语言表达既简洁鲜明,又古朴典雅,但是如果理解有误,使用不当,反而会贻笑大方。
.....④正在加速发展的山西制造业,要形成一个轻重均衡的结构,不仅需要高科技产品,也需要老百姓日常使用的下里巴人....。
⑤在南海问题上,我们奉劝菲律宾尽早回到谈判解决问题的轨道上来,也奉劝域外势力及时收手,不要试图浑水摸鱼。
.....⑥日前,美国游泳队巴西里约热内卢奥运会选拔赛在美国奥马哈闭幕,美国游泳队在本届奥运会上的参赛阵容水落石出....。
项城市第三高级中学2016-2017学年第一学期语文周练试题时间:150分钟分数:150分第I 卷阅读题一、现代文阅读(9 分,毎小题 3 分)谣言为什么不缺受众谣言从来不是新鲜事。
马克·吐温曾说:“当真相还在穿鞋的时候,谣言就已经跑遍半个地球了。
”在100多年后的今天,技术的进步让谣言跑得更快、传得更远了。
相关研究显示,微信平台的活跃用户数量已超过6亿,作为一个相对封闭的圈子,微信中的联系人多是同事、朋友等平日里打过交道、联系较为紧密的人,当现实关系延伸到网络的虚拟空间中,每一条转发显得更具说服力,也更容易被再次转发扩散。
《小龙虾是一种处理过尸体的虫子,外国人从不吃》《肯德基的鸡都长着六个翅膀》《人社部渐进式延迟退休年龄时间表》……这些看着眼熟的文章是不是曾经在你的微信朋友圈出现过?在微信公众平台辟谣中心,类似已辟谣的文章达280148篇,而2015年微信朋友圈谣言的举报处理总量达到21695437次。
微信官方推出的公众号“谣言过滤器”将谣言分为七类,分别为失实报道、儿童走失、财产安全、食品安全、人身安全、科学常识、迷信。
数据显示,2015年失实报道所占比例最高,达到了29%,而排名第二、第三的分别为食品安全(20%)与人身安全(12%)。
《倒着输银行卡密码能自动报警》《长期喝豆浆会致乳腺癌》等入选年度十大谣言,举报次数最多的《微信朋友圈降权》达到了233210次。
很多人疑惑,许多诸如“六个翅膀的鸡”等谣言明明漏洞百出,为何还是有很多人愿意相信甚至反复传播?在不少专家看来,网络推手和商业营销是部分谣言产生和传播的一股重要力量。
但从受众心理角度分析,猎奇心理是谣言传播的最普遍的原因之一。
新浪微博相关负责人尹雪赓分析认为:“从传播规律来看,人们更关注新奇、颠覆常识的讯息,出于这样的心理,谣言也就更容易得到传播。
”失实报道之所以能成为微信朋友圈中的谣言主力,一定程度上就是因为满足了不少人的猎奇心理。
永年中学2017届高三周测试(一)第Ⅰ卷(三部分;共105分)第一部分:听力(共两节,满分30分)该部分分为第一、第二两节。
注意:回答听力部分时,请先将答案标在试卷上。
听力部分结束前,你将有两分钟的时间将试卷上的答案转涂到客观题答题卡上。
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,并标在试卷的相应位置。
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.Who is the man?A.A taxi driver.B.A traffic policeman.C.A restaurant waiter.2.What are the two speakers doing?A.Watching a film.B.Talking about a book.C.Listening to a record.3.What is the man doing?A.Asking for help.B.Making suggestions.C.Asking for permission.4.What are the two speakers talking about?A.A novel.B.A cinema.C.A film.5.When would Thomas and Lily like to leave?A.Tomorrow.B.Next Monday or Tuesday.C.This Tuesday.第二节(共15小题;每小题1.5分,满分22.5分)听下面五段对话。
每段对话后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。
听每段对话前,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。
每段对话读两遍。
听下面一段对话,回答第6和第7两个小题。
重庆市第八中学2017届高三上学期周考文数试卷答 案1~5.CBCBD 6~10.ADCBC 11~12.DC 13.514.15-15.28π316.91017.解:(1)填表如下:从表中可知,3A =,23ππ2()88Tω===⎡⎤⨯--⎢⎥⎣⎦,则()3cos(2)f x x ϕ=+, 代入最值点π(,3)8-,得π2π4k ϕ=+,k Z ∈, 由已知π2ϕ<,所以π4ϕ=, 所以π()3cos(2)4f x x =+.(2)依题意,ππ5π()3cos 2()3cos(2)3412g x x x ⎡⎤=-+=-⎢⎥⎣⎦, 令5π2π12x k -=,k Z ∈,解得5ππ242k x =+,当0k =时,得离y 轴最近的对称轴为5π24x =.18.解:(1)列联表补充如下:因为22210(50902050)23.8641001070140K ⨯-⨯=≈⨯⨯⨯,因为23.864 6.635>,所以能在犯错误的概率不超过1%的前提下认为家庭经济状况与生育二胎有关.(2)经济状况好和经济状况一般的家庭都抽取5042100⨯=个. (3)由(2),设经济状况好的2个家庭为A ,B ,经济状况一般的2个家庭为c ,d ,则所有基本事件有AB ,Ac ,Ad ,Bc ,Bd ,cd 共6种, 符合条件的只有AB 这一种, 所以2个家庭都是经济状况好的概率为16. 19.(1)证明:∵2SA =,1AE =,π3SAE ∠=, ∴,SE AD ⊥.∵平面SAD ⊥平面ABCD ,平面SAD I 平面ABCD AD =, ∴SE ⊥平面ABCD . ∴SE BC ⊥. 又∵BCDE 为矩形,∴BE BC ⊥,且SE BE E =I , ∴BC ⊥平面SBE .(2)解:如图,连接AC 交BE 于M ,连接FM , ∵//SA 平面BEF ,平面SAC I 平面BEF FM =, ∴//SA FM , ∴SF AMFC MC=, 又∵//EM CD ,∴12AM AE MC ED ==, ∴12λ=.20.解:(1)双曲线D 的中心在原点,右焦点为(2,0), 则抛物线C 的方程为28y x =.(2)假设存在直线l :0x x =满足题意, 设11(,)P x y ,则2118y x =,圆心为113(,)22x y E +,过圆心E 作0x x =的垂线,垂足为F ,直线l 与圆的一个交点为G ,则弦长2||FG =,22222||||||||||FG EG EF EA EF =-=-222111033(3)()()222x y x x ++=-+-- 222211110033()()(3)242x y x x x x -+⎡⎤=+--++⎢⎥⎣⎦20100(1)3x x x x =-+-,当01x =时,2||2FG =,直线l 为1x =,被以PA 为直径的圆E 所截得的弦长为定值 21.(1)解:'()2(sin )f x x x =-, 设()sin g x x x =-,则'()1cos g x x =-, 当0x ≥时,'()0g x ≥,即()g x 为增函数,则'()2()2(0)0f x g x g =≥=,所以()f x 在[0,)x ∈+∞上是增函数, 因此min ()(0)2f x f ==.(2)证明:由(1)得,当0x ≥得,当0x ≥时,'()0f x ≥,即sin x x ≤,()2f x ≥,即2cos 12x x ≥-,所以2sin cos 12x x x x -+≤+.下证212x x x e +≤-即可得结论.令2()12xx h x e x =---,则'()1x h x e x =--,[]'()'1x h x e =-,当0x ≥时,10x e -≥,所以'()h x 是增函数,且'()'(0)0h x h ≥=,所以()h x 是增函数,()(0)0h x h ≥=,可得2102xx e x ---≥,即212xx e x -≥+,所以结论成立.22.(1)证明:依题意,||4sin OA β=,π||4sin()6OB β=+,π||4sin()6OC β=-,则ππ||||4sin()4sin()66OB OC ββ+=++-|OA β==. (2)解:当π3β=时,B 点的极坐标为πππππ(4sin(),())(4,)36362++=, C 点的极坐标为πππππ(4sin(),())(2,)36366--=,化为直角坐标,即(0,4)B ,C ,则直线l 的方程为4y =+,所以04y =,23απ=.23.解:(1)当0m =时,()|3|g x x =--,且0x >,则由()|2|g x x n ≤-+恒成立,得min (|2||3|)n x x -≤-+-,因为|2||3||2(3)|1x x x x -+-≥---=,当且仅当[]2,3x ∈时取等号, 所以1n -≤,即[1,)n ∈-+∞.(2)当1m =时,13,01,()()|3|23,13,3,3,x x x g x f x x x x x ⎧+-<<⎪⎪=--=-≤≤⎨⎪>⎪⎩当01x <<时,13231x x+->-=-,当13x ≤≤时,231x -≥-,所以当1x =时,min ()1g x =-.。
一、现代文阅读(9分,每小题3分)阅读下面文字,完成1—3题清明节的人文精神清明节是我国民间重要的传统节日。
我国传统节日的形成与二十四节气有关。
记载了二十四节气的先秦古籍《逸周书·时训》中说到:“清明之日,桐始华。
”这里记载的节气不等于节日,节气是季节时序的标记。
而清明节气的重要特点是冬季即将过去,而春天已经降临。
这个时候人的活动要与物候相对应,将社会活动的节律与自然的时间进程有机地联系在一起。
我国传统的清明节大约始于周代,已有大约两千五百多年的历史.清明最开始是一个很重要的节气,清明一到,气温升高,正是春耕春种的大好时节,故有“清明前后,种瓜点豆”“植树造林,莫过清明"的农谚。
学术界认为清明节的起源与寒食节有关.关于寒食节的起源有各种说法.有的学者认为由纪念介子推起,推而广之要祭拜自己的祖先.后来,由于清明节和寒食节的日子接近,而寒食节是民间禁火的日子,渐渐地,寒食与清明就合二为一了。
唐玄宗在公元732年颁布诏书曰:“寒食上坟,礼经无文,近代相传,浸以成俗。
"现在寒食节在某些地区已经消失,而清明节已经成为一个独立的节日流传至今。
我国的传统节日都有贵人伦、重亲情的特点,春秋祭祀,以时思之,春秋祭祖,符合人们春祈秋报的心理。
中华民族自古以来就有祭祖敬祖的传统,尊重祖先,尊重祖先创造的优良传统,这是中华民族的美德.这种传统已经积淀为一种民俗文化心理,成为人们的集体意识.清明节的习俗又与现在消失了的节日上巳节有关.农历三月三日的上巳节有两个活动内容:一是人们在春天到来之时到野外踏青嬉戏;一是招魂续魄,召唤亲人的亡魂,也召唤自己的魂魄回归.随着原始信仰的淡化,上巳节演变成了春游,上巳节消失了,这个文化因子在清明节中得到充分的体现.人们在节日里踏青郊游,尽享春光。
或家族合欢,或交友团聚,总之在密切人与人之间的关系,增加凝聚力.清明节的另一项民俗活动是插柳,清明节的又一个说法叫“插柳节"。
广东省珠海市2016-2017学年高三上学期周考数学(文)试题一、选择题(本大题共12个小题,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.已知集合{}21110,24,2x M x x N xx Z +⎧⎫=-≤=<<∈⎨⎬⎩⎭,则M N =( ) A .{}1,0 B .{}1 C .{}1,0,1- D .φ 【答案】A 【解析】试题分析:{}{}{}{}21011,1,0,1,0M x x x x N M N =-≤=-≤≤=-∴⋂=-,故选A.考点:集合的运算.2.复数()()()2lg 3441x xz x i x R -=+-+-∈,z 是z 的共轭复数,复数z 在复平面内对应的点位于( )A .第一象限B .第二象限C .第三象限D .第四象限 【答案】A考点:复数的几何意义.【易错点睛】本题主要考查了复数的代数运算,复数的几何意义.复数集与复平面内所有的点构成的集合之间存在着一一对应关系,每一个复数都对应着一个点(有序实数对).复数的实部对应着点的横坐标,而虚部则对应着点的纵坐标,只要在复平面内找到这个有序实数对所表示的点,就可根据点的位置判断复数实部、虚部的取值.3.若点()4,2P 为圆2260x y x +-=的弦MN 的中点,则弦MN 所在直线方程为( )A .2100x y +-=B .20x y -=C .280x y +-=D .260x y --= 【答案】C 【解析】试题分析:2260x y x +-=的圆心坐标为(3,0),∴所求直线的斜率11,20243k =-=-∴--直线方程为 12(4),2802y x x y -=--∴+-=,故选C.考点:直线与圆的位置关系. 4.下列结论错误..的个数是( ) ①命题“若p ,则q ”与命题“若q ⌝,则p ⌝”互为逆否命题;②命题[]:0,1,1xp x e ∀∈≥,命题2:,10q x R x x ∃∈++<,则p q ∨为真;③“若22am bm <,则a b <”的逆命题为真命题; ④若p q ∨为假命题,则p 、q 均为假命题.A .0B .1 C. 2 D .3 【答案】B考点:命题.5.同时拋掷5枚均匀的硬币80次,设5枚硬币正好出现2枚正面向上,3枚反面向上的次数为ξ,则ξ的数学期望是( )A .20B .25 C. 30 D .40 【答案】B 【解析】试题分析:5枚硬币正好出现2枚正面向上,3枚反面向上的概率为2235115()()2216C =,由题意可知ξ服从5(80,)16的二项分布,所以数学期望为5802516⨯=,故本题选B. 考点:二项分布与数学期望.6.某几何体的三视图如图所示。
绝密★启用前广东省珠海市2016-2017学年高三上学期周考数学(文)试题注意事项:1.答题前填写好自己的姓名、班级、考号等信息2.请将答案正确填写在答题卡上第I卷(选择题)一、选择题1.已知集合,,则等于()A. B. C. D.2.已知命题:,,则:()A., B.,C., D.,3.复数的虚部为()A. B. C. D.4.在等差数列中,已知,则公差()A. B. C. D.5.某几何体的三视图(单位:)如图所示,其中左视图是一个边长为2的正三角形,则这个几何体的体积是()A. B. C. D.6.已知为等差数列,若,则()A. B. C. D.7.已知向量,满足,且,则与的夹角为()A. B. C. D.8.如图,在正方体中,异面直线与所成的角为()A. B. C. D.9.已知变量满足,则的取值范围是()A. B.C. D.10.已知是定义在上的偶函数,且恒成立,当时,,则当时,()A. B. C. D.11.函数的图象大致是()12.设函数,若互不相等的实数,,满足,则的取值范围是()A. B.C. D.第II卷(非选择题)请点击修改第II卷的文字说明二、填空题13.若一个直角三角形的三边长恰好组成一个公差为的等差数列,则该三角形的面积是____.14.若曲线在点处的切线与直线平行,则__________.15.函数y=a1-x(a>0,a≠1)的图象恒过定点A,若点A在直线mx+ny-1=0(mn>0)上,则的最小值为________16.函数,,若对,,,则实数的最小值是.三、解答题17.在锐角中,内角,,的对边分别为,,,且.(I)求角的大小;(II)若,,求的面积.18.在数列中,,.(1),求证数列是等比数列;(2)求数列的通项公式及其前项和.19.如图,是以为直径的半圆上异于点的一点,矩形所在平面垂直于该半圆所在的平面,且.(I)求证:;(II)设平面与半圆弧的另一个交点为,,求三棱锥的体积.20.已知非零向量满足,且.(1)求;(2)当时,求向量与的夹角的值.21.已知函数是定义在上的奇函数,且.(1)求的解析式;(2)用定义证明在上是增函数;(3)解不等式.22.已知函数.(Ⅰ)若函数在上是减函数,求实数的取值范围;(Ⅱ)令,当(是自然数)时,函数的最小值是3,求出的值;(Ⅲ)当时,证明:.广东省珠海市2016-2017学年高三上学期周考数学(文)试题参考答案1.B【解析】试题分析:.考点:集合交集.【易错点晴】集合的三要素是:确定性、互异性和无序性.研究一个集合,我们首先要看清楚它的研究对象,是实数还是点的坐标还是其它的一些元素,这是很关键的一步.第二步常常是解一元二次不等式,我们首先用十字相乘法分解因式,求得不等式的解集.在解分式不等式的过程中,要注意分母不能为零.元素与集合之间是属于和不属于的关系,集合与集合间有包含关系.在求交集时注意区间端点的取舍.熟练画数轴来解交集、并集和补集的题目.2.C【解析】试题分析:命题“:,”的否命题是“,”.故选C.考点:命题的否定.3.A【解析】试题分析:因为,所以其虚部为,故选A.考点:复数的运算.4.C【解析】试题分析:由已知两式相减得,即.考点:等差数列的基本性质.5.B【解析】试题分析:由几何体的三视图可知,该几何体为底面是直角梯形,高为的四棱锥,其中直角梯形两底长分别为1和2,高为2.故这个几何体的体积是,故应选.考点:1、三视图;2、空间几何体的体积、面积的计算.6.A【解析】试题分析:由,得,所以=,故选A.考点:1、等差数列的性质;2、诱导公式.7. B【解析】试题分析:,故选B.考点:向量的基本运算.8.C【解析】试题分析:由题可知,在正方体中,,所以异面直线与所成的角与异面直线与所成的角相等,连接,BD,为所求角,设正方体的边长为1,在中,三条边长均为,故=.考点:异面直线所成角9.D【解析】试题分析:画出可行域如下图所示,由图可知,目标函数分别在点和点处取得最大值为,最小值为.考点:线性规划.10.B【解析】试题分析:由已知有函数是周期为,当时,有,故,同理,当时,有,又知是偶函数,故时,有,故,即时,.考点:函数的奇偶性与周期性.11.C【解析】试题分析:由题意得,易判断函数为偶函数,由,得.,且当时,;当时,,故选C.考点:偶函数图象的性质.12.D【解析】试题分析:由题意可得,函数的图象如下图所示,若存在互不相的实数满足,则,不妨令,则,,故,故选D.考点:1.分段函数的解析式及图象的作法;2.函数值域的应用;3.函数方程的综合运用;4.数形结合思想. 【方法点睛】本题主要考查的是分段函数的解析式及其图象的作法,函数的值域的应用,函数与方程的综合应用等知识,考查了运算求解能力,数形结合思想,化归与转化思想,属于中档题,此类题目不要怕,根据题意正确的画出图象,数形结合,会非常容易找到满足时的限定条件,以此作为突破口,便能解决此类问题,因此正确的画出图象,利用数形结合是解这类题目的关键.13.【解析】试题分析:由题意设三边分别为,由题意可得,即,故,即三边分别为,故该三角形的面积为,故应填.考点:等差数列和勾股定理等知识的综合运用.14.【解析】试题分析:∵,,∴,∴,故答案为.考点:利用导数求切线斜率.15.4【解析】试题分析:由已知定点A坐标为(1,1),由点A在直线mx+ny-1=0上,∴m+n=1,又mn>0,∴m>0,n>0,∴,当且仅当两数相等时取等号.考点:基本不等式;指数函数的图象与性质16.【解析】试题分析:,对称轴,在区间递减,∴,,是增函数,∴,,∴只需即可,解得:,故答案为:.考点:二次函数的性质.17.(I);(II).【解析】试题分析:(I)由已知得到;(II)由(I)知,.试题解析:(I)由已知得到,且,,∴,∴,且,∴;………………6分(II)由(I)知,由已知得到:,所以;………………12分考点:1、三角恒等变换;2、解三角形.18.(1)证明见解析;(2),.【解析】试题分析:(1)借助题设条件运用等比数列的定义推证;(2)借助题设运用第一问的结论求解探求.试题解析:(1)由已知有,解得,故,.于是,即.因此数列是首项为3,公比为2的等比数列.(2)由(1)知,等比数列中,公比,所以.于是,因此数列是首项为,公差为的等差数列.,所以,所以.考点:等差数列等比数列等有关知识的综合运用.19.(I)证明见解析;(II).【解析】试题分析:(I)由证明:矩形面和面,又,面;(II)面.又面面.试题解析:(I)证明:矩形面,面,且,∴面,从而,①………………3分又在半圆中,为直径,∴,即,②由①②知:面,故有:.………………6分(II),∴面.又面面,∴.在等腰梯形中,,,,………………9分∴,.………………12分考点:1、线面垂直;2、面面垂直;3、线面平行.20.(1);(2).【解析】试题分析:(1)由,得,再由,即可求得;(2)由,即可求得,再求得,利用向量的夹角公式,即可得到向量的夹角.试题解析:(1)(2)又考点:平面向量的数量积的运算;向量的模,数量积表示两个向量的夹角.21.(1);(2)证明见解析;(3).【解析】试题分析:(1)根据条件建立方程关系即可求出函数的解析式;(2)利用定义证明在上是增函数;(3)根据函数奇偶性和单调性之间的关系即可解不等式.试题解析:(1)即,,(2)设,且,则,∵,,,,∴,即,∴在上是增函数.(3)依题意得,,则∴.考点:1.函数奇偶性的应用;2.利用定义法证明函数的单调性.22.(Ⅰ);(Ⅱ);(Ⅲ)证明见解析.【解析】试题分析:(I)求导,根据函数单减得在上恒成立,再结合二次函数的性质可求出的范围;(II)由,对分情况讨论,由在的单调性求最值符合题意;(III)构造函数,利用单调性证明不等式.试题解析:解:(Ⅰ)在上恒成立,令,有,得,得.(Ⅱ)由,得,①当时,在上单调递减,,(舍去),②当时,在上单调递减,在上单调递增,∴,,满足条件.③当时,在上单调递减,,(舍去),综上,有.(Ⅲ)令,由(Ⅱ)知,,令,当时,,在上单调递增,,,即.考点:利用导函数研究函数的单调性,求函数的最值,利用单调性证明不等式.【方法点晴】本题是函数导数的一个综合考察,既有函数的单调性,也考察了分情况讨论在区间上找最值,也用到了构造函数证明不等式,第一问中给出函数单调减,转成在区间上恒成立,等号是一个易错点,进而转成二次函数的恒成立,本题中二次函数开口向上,在闭区间恒小于等于,故只需保证两个端点即可;第二问中常规的讨论,需讨论在单调性研究最值即可;第三问中先分析不等式结构,发现同时除以后,左右两个函数有,易得结果.。
枣阳市育才中学2017届高三年级上学期文科数学周考试题(12.9)
一.选择题(本大题共12小题,每小题5分,共60分)
1.两灯塔,A B 与海洋观察站C 的距离都等于()a km ,灯塔A 在C 北偏东30o ,B 在C 南
偏东60o ,则,A B 之间相距( )
A .()a km
B .3()a km
C .2()a km
D .2()a km
2.已知函数()()11,22
x x f x x g x x =+=+,则下列结论正确的是( ) A.()f x 是奇函数,()g x 是偶函数 B.()f x 是偶函数,()g x 是奇函数
C. ()f x 和 ()g x 都是偶函数
D.()f x 和()g x 都是奇函数
3.从一个含有40个个体的总体中抽取一个容量为7的样本,将个体依次随机编号为
01,02,…,40,从随机数表的第6行第8列开始,依次向右,到最后一列转下一行最左一
列开始,直到取足样本,则获取的第4个样本编号为( )
(下面节选了随机数表第6行和第7行)
A .06
B .10
C .25
D .35
4.三个数0.377,0,3,ln 0.3a b c ===大小的顺序是( )
A .a b c >>
B .a c b >>
C .b a c >>
D .c a b >>
5.函数11ln 22y x x x
=+--的零点所在的区间为( ) A .1(,1)e
B .(1,2) C.(2,)e
D .(,3)e
6.已知三棱P ABC -的四个顶点都在半径为2的球面上,且PA ⊥平面ABC ,若
2,2AB AC BAC π==∠=
,则棱PA 的长为( )
A.32 C.3 D.9
7.下列函数中,在区间(1)+∞,上为减函数的是( )
A .11y x =
- B .12x y -=
C .y .ln(1)y x =- 8.圆2240x y x +-=的圆心坐标和半径分别为( )
A .(0,2),2
B .(2,0),2
C .(-2,0),4
D .(2,0),4
9.等腰直角△AOB 内接于抛物线22(0)y px p =>,O 为抛物线的顶点,OA OB ⊥,△AOB 的面积是16,抛物线的焦点为F ,若M 是抛物线上的动点,则
||||OM MF 的最大值为( )
A .3
B
C
D 10.已知函数()sin tan 4cos 3f x a x b x π
=-+,且()11f -=, 则()1f =( )
A .3
B .-3
C .0
D .1
11.已知函数()1y f x =+定义域是[]2,3-,则()1y f x =-的定义域是( )
A .[]0,5
B .[]1,4-
C .[]3,2-
D .[]2,3-
12.已知()f x 是定义在R 上的奇函数,(1)f x +是偶函数,当x ∈(2,4)时,()|3|f x x =-,则(1)(2)(3)(4)f f f f +++=( )
A .1
B .0
C .2
D .-2
二.填空题:(本大题共4小题,每小题5分,共20分)
13.已知向量),,2(),3,1(t b a =--=且b a //,则=-b a .
14.直线sin 10x y θ-+=(R θ∈)的倾斜角范围是 .
15.函数41)(2+
-+=b x a x x f (b a ,是正实数)只有一个零点,则ab 的最大值为 .
16.甲乙两人下棋,甲获胜的概率为0.3,甲乙和棋的概率为0.4,则甲不输的概率为_______.
三、解答题
17.(本题12分)在△ABC 中,a ,b ,c 分别为内角A ,B ,C 所对的边,
且满足a b c <<,2sin b a B =. (1)求A 的大小;
(2)若2a =,b =,求△ABC 的面积.
18.(本题12分)以椭圆()2
22:11x M y a a
+=>的四个顶点为顶点的四边形的四条边与22:1O x y +=e 共有6个交点,且这6个交点恰好把圆周六等分.
(1)求椭圆M 的方程;
(2)若直线l 与O e 相切,且椭圆M 相交于,P Q 两点,求PQ 的最大值.
19.(本题12分)以边长为4的等比三角形ABC 的顶点A 以及BC 边的中点D 为左、右焦点的椭圆过,B C 两点.
(1)求该椭圆的标准方程;
(2)过点D 且x 轴不垂直的直线l 交椭圆于,M N 两点,求证直线BM 与CN 的交点在一条直线上.
20.(本题12分)上饶某中学研究性学习小组为调查市民喜欢观看体育节目是否与性别有关,随机抽取了55名市民,得数据如下表:
(1)判断是否有99.5%的把握认为喜欢观看体育节目与性别有关?
(2)用分层抽样的方法从喜欢观看体育节目的市民中随机抽取6人作进一步调查,将这6位市民作为一个样本,从中任选2人,求男市民人数ξ的分布列和期望.
下面的临界值表供参考:
21.(本题12分)已知函数x a x a x x f )1(2)12(2
3)(23+-++=. (1)若)(x f 在1=x 处取得极大值,求实数a 的取值范围;
(2)存在]2,1[∈x ,使0)(≤x f ,求实数a 的取值范围.
22.(本题12分)设抛物线C :22x py =(0p >)的焦点为F ,准线为l ,点0(,1)A x 为抛物线C 上一点,且||2FA =.
(1)求抛物线C 的方程;
(2)H 为抛物线C 上不与原点重合的一点,点N 是线段OH 上异于点O ,H 的任意一点,过点N 作x 轴的垂线依次交抛物线C 和x 轴于点P ,M ,求证:
||||||||
MN OH MP ON =.
答案
选择:1_5CAAAC 6_10CABCA 11_12 AB
填空13.)9,3(-- 14.3,44ππ⎡⎤⎢⎥⎣⎦
15.161 16.7.0 17.(1)6A π=
(2
)18.(1)2
213
x y +=;(2
. 19.(1)22
196x y +=(2
)x =
20.(1)有%5.99的把握认为喜欢观看体育节目与性别有关;(2)分布列见解析,43
. 21.(1))23,(--∞∈a ;(2)),67[+∞-
∈a . 22.(1)24x y =;(2)证明见解析.
(2)证明:如图,设过点N 的垂线为(0)x t t =≠,
联立2,4,x t x y =⎧⎨=⎩得2,,4
x t t y =⎧⎪⎨=⎪⎩即点2(,)4t P t . 令||||MN MP λ=,则2(,)4t N t λ,ON :4
t y x λ=, 联立2,44,t y x x y λ⎧=⎪⎨⎪=⎩得22,,4x t t y λλ=⎧⎪⎨=⎪⎩即点22(,)4t H t λλ, ∴2
(,)4
t ON t λ=u u u r ,22(,)4t OH t λλ=u u u r ,则OH ON λ=u u u r u u u r ,∴||||OH ON λ=, ∴||||||||
MN OH MP ON =.。