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2023年新高考数学临考题号押题第3题 平面向量(新高考)(解析版)

2023年新高考数学临考题号押题第3题 平面向量(新高考)(解析版)

押新高考卷3题平面向量考点3年考题考情分析平面向量2022年新高考Ⅰ卷第3题2022年新高考Ⅱ卷第4题2021年新高考Ⅰ卷第10题2021年新高考Ⅱ卷第15题2020年新高考Ⅰ卷第7题2020年新高考Ⅱ卷第3题高考中平面向量均是以小题的形式进行考查,难度较易或一般,纵观近几年的新高考试题,分别考查了平面向量的基本定理,平面向量的坐标运算,平面向量数量积与夹角公式,可以预测2023年新高考命题方向将继续围绕平面向量数量积运算、坐标运算等展开命题.向量的运算(1)两点间的向量坐标公式:()11,y x A ,()22,y x B ,=AB 终点坐标-始点坐标()1212,y y x x --=(2)向量的加减法()11,y x a =,()22,y x b =()2121y y x x b a ++=+∴,,()2121y y x x b a --=-,(3)向量的数乘运算()y x a ,=,则:()()y x y x a λλλλ,,==(4)向量的模()y x a ,=,则a 22y x +=(5)相反向量已知),(y x a =,则),(y x a --=-;已知(6)单位向量()⎪⎪⎭⎫ ⎝⎛+-+-⎪⎪⎭⎫ ⎝⎛++=22222222,,,y x yy x x y x yy x x y x a 反向单位向量为同向单位向量为(7)向量的数量积[]πθθθ,0,,,cos ∈⋅⋅=⋅且的夹角,记作与为其中b a b a b a b a ()()21212211,,,y y x x b a y x b y x a +=⋅∴==,(8)向量的夹角222221212121cos y x y x y y x x ba b a +⋅++=⋅⋅=θ(9)向量的投影ab a ba b a b b a b b b a b a b a a a b a ⋅=⋅⋅⋅=⋅⋅=⋅⋅⋅=⋅θθcos cos 上的投影为在上的投影为在(10)向量的平行关系1221//y x y x b a b a =⇔=⇔λ(11)向量的垂直关系02121=+⇔=⋅⇔⊥y y x x b a b a (12)向量模的运算22aa =1.(2022·新高考Ⅰ卷高考真题)在ABC 中,点D 在边AB 上,2BD DA =.记CA m CD n ==,,则CB=()A .32m n-B .23m n-+C .32m n+ D .23m n+ 【答案】B【分析】根据几何条件以及平面向量的线性运算即可解出.【详解】的模为2,根据正六边形的特征,AP 在AB方向上的投影的取值范围是结合向量数量积的定义式,AB 等于AB 的模与AP 在ABAB的取值范围是()2,6-,A.【点睛】该题以正六边形为载体,考查有关平面向量数量积的取值范围,涉及到的知识点有向量数量积的定义式,属于简单题目.6.(2020·新高考Ⅱ卷高考真题)在ABC 中,D 是AB 边上的中点,则CB=()A .2CD CA + B .2CD CA - C .2CD CA - D .2CD CA+ 【答案】C【分析】根据向量的加减法运算法则算出即可.【详解】()222CB CA AB CA AD CA CD CA CD CA-=+=+=+-= 故选:C【点睛】本题考查的是向量的加减法,较简单.所以12m =,56n =,所以43m n +=,故选:D8.(2023·重庆·统考模拟预测)在正方形则λμ+的取值范围是()A .[]1,1-B .[]0,1【答案】B【分析】建立平面直角坐标系,写成点的坐标,分点【详解】以B 为坐标原点,AB ,BC 所在直线分别为设1AB =,则()()()(0,0,1,0,0,1,B A C D 当点E 在BC 上时,设()[]0,,0,1E m m ∈则()()()1,1,01,1m λμ-=-+-,即m λ--⎧⎨=⎩当点E 在CD 上时,设()[],1,0,1E t t ∈,则()()()1,11,01,1t λμ-=-+-,即λμ--⎧⎨=⎩故选:B9.(2023·湖南邵阳·统考二模)已知向量(1,3a = 值为()A .219B .411C 【答案】A【分析】根据向量的坐标运算,垂直向量的坐标运算,可得答案【详解】由题意,()14,51b c λλλ+=+- ,由a 即()143510λλ++⨯-=,解得219λ=.故选:A.10.(2023·安徽合肥·校考一模)已知非零向量a ,()A .45B .60CA .13BE CF --B .13BE - 【答案】C【分析】确定133222AD BD BE =- 【详解】13BE BD DE BD =+=- 23CF CD DF CD AD =+=- ,则 ①+②两式相加,3322AD CF =- 故选:C.13.(2023·重庆·统考二模)已知点34x y +=()A .5B .6【答案】C【分析】如图,点O 在AB 、AC 根据数量积的定义求出BC BA ⋅ ,最后根据数量积的运算律得到【详解】如图,点O 在AB 、AC∴E 是AM 的中点.分别过C ,N 作CH AM ∥,NF 因为AENF 为平行四边形,所以且12AE AM =,AF EN ==由此可得AN = 1528AM AB + .故选:C.15.(2023·福建泉州·校考模拟预测)理最早的证明是东汉数学家赵爽在为《周髀算经》作注时给出的,被后人称为A .4255a b +B .25【答案】A【分析】根据相似三角形,利用向量的分解可得解【详解】如图所示,过点E 分别作EM AB ⊥,则AME AEB ,AEN ABE ,所以AM AE AE AB = ,AN AE BE AB = ,AM 由已知得2AE BF BE == ,则在Rt AEB 中,tan BE BAE AE ∠== 所以25cos 5BAE ∠=,sin BAE ∠=即255AE AB = ,55BE AB = ,所以45AM AB = ,2255AN AB ==A .[]28,46B 【答案】C 【分析】利用已知条件,再根据PB 的范围便可求出【详解】如图可知,PE = 因为B 是EF 的中点,所以所以()PE PF PB BE ⋅=+ 即()(PE PF PB BE ⋅=+⋅ 所以22PE PF PB BE ⋅=- 由条件可得,3BE = ,因为P 为AC 边上的一个动点,故当P 为AC 中点时,PB 当P 为A 或C 时,PB 最大,所以[43,8]PB ∈ ,所以2[48,64]PB ∈ ,又因为A .2,23⎡⎤⎣⎦B .而ABC 是正三角形,则∠当点P 在弧BD 上时,0θ≤显然3,1,AO OP OAB ==∠所以(AB AP AB AO OP ⋅=⋅+ 32321cos 2θ=⨯⨯+⨯⨯=故选:B。

高考语文知识点总结新题型

高考语文知识点总结新题型

高考语文知识点总结新题型在高考语文考试中,随着时间的推移,各省份的考试改革也是不断推进的。

而新学年的课程改革使得语文科目的考试形式也随之发生了一些变化。

针对这些新题型,我们需要掌握一些必备的知识点。

本文将总结一些重要的新题型知识点,并对如何应对这些题型进行一些探讨。

首先,一篇好的议论文是需要有论据支持的。

而近年来,高考中的议论文题目也出现了多种多样的变化。

例如,有的题目给出了两种观点,要求考生采取其中一方进行阐述,同时列出相关的论据支持。

这种题型要求考生能够分析不同观点的利弊,并根据自己的判断给出合理的解释。

因此,在备考过程中,我们需要学会运用写作素材的技巧,多读一些相关的文章,了解不同观点的立场与论据。

同时,我们还需要掌握一些常用的写作技巧,如对比分析,通过将不同观点进行对比,找出区别与共同点,从而更好地阐述自己的论点。

其次,高中语文的阅读理解题在最近几年也发生了一些变化。

以往的阅读理解重点在于理解文章的基本信息,如主旨、观点等。

而现在的高考阅读理解题更加侧重于考查考生的文学修养和文化素养。

因此,在备考过程中,我们需要加强对文学作品的阅读与理解。

同时,还需要掌握一些常见的修辞手法,如比喻、夸张等,以便更好地分析文章的意义和作用。

此外,高考语文中的写作题目也发生了一些变化。

在过去,写作题目往往比较开放,考生可以任意发挥,写一篇记叙文、说明文或议论文等。

而随着考试改革的推进,写作题目的形式也变得更加具体和明确。

例如,一些题目要求考生根据给定的情境写一封信,或根据一篇文章写一篇续写作文等。

这种题型要求考生能够灵活运用语言,根据要求进行思考和表达。

因此,在备考过程中,我们需要多做一些题目的练习,熟悉不同类型写作题目的要求,并培养良好的写作习惯和技巧。

最后,高考语文中的翻译题也是考察考生语言运用能力的一道重要题目。

翻译题要求考生将一段中文翻译成英文或将一段英文翻译成中文。

这种题型不仅要求考生对语言的熟悉程度,还需要考生能够准确理解原文的意义,并将其转化为另一种语言。

2023年高考语文二轮复习专题训练 专题03 诗歌鉴赏之客观选择题专训(3) Word版含解析

2023年高考语文二轮复习专题训练 专题03  诗歌鉴赏之客观选择题专训(3) Word版含解析

专题03 2022高考新题型诗歌鉴赏之客观选择题专训(3)(教师版)时间:45分钟分值:30分得分:(2023优秀模拟)阅读下面这首词,完成后面问题。

夜游宫·记梦寄师伯浑[注]陆游雪晓清笳乱起,梦游处、不知何地。

铁骑无声望似水。

想关河:雁门西,青海际。

睡觉寒灯里,漏声断、月斜窗纸。

自许封侯在万里,有谁知?鬓虽残,心未死。

【注】师伯浑:陆游的友人。

1.下列对这首词的分析和鉴赏,不正确的一项是( )(3分)A.“雪晓清笳乱起”句突出了边地风光特色,也渲染了战争气氛。

B.“铁骑无声望似水”句,形象地描绘了军队阵容的整肃与声势的浩大。

C.“清笳乱起”和“铁骑无声”一动一静,以动衬静,手法巧妙。

D.“想关河”中的“想”是“推测”“猜想”的意思。

“雁门西,青海际”两句,代指宋金对峙的前线地区。

【答案】C【解析】“以动衬静”错。

“清笳乱起”表现边关敌情,“铁骑无声”表现军队严整,没有主次构不成衬托。

可以说是“动静结合”手法。

【赏析】《夜游宫·记梦寄师伯浑》是南宋词人陆游创作的一首词。

词的上片记梦,写梦游中他来到前线,清笳四起,铁骑无声,关塞雄丽,一派清寒肃穆的边塞军旅生活场面。

下片抒情,对孤苦寒灯,听凄切漏声,看斜月清冷,感慨功名未就,悲叹鬓发花白,却依然执着自信,壮志不老。

全词以梦境与现实的交织对比,来抒写词人至死不衰的爱国激情,颇具沉雄悲壮之美。

上片写的是梦境。

一开头就渲染了一幅有声有色的边塞风光画面:雪、笳、铁骑等都是特定的北方事物,放在秋声乱起和如水奔泻的动态中写,有力地把读者吸引到作者的词境里来。

让读者一下子把联想融于作者的描绘之中。

中间突出一句点明这是梦游所在。

先说是迷离惝恍的梦,不知道这是什么地方;然后才又进一步引出联想——是在梦中的联想;这样的关河,必然是雁门、青海一带了。

这里,是单举两个地方以代表广阔的西北领土。

但是,这样苍莽雄伟的关河当时落在谁的手里那就不忍说了。

那作者有这样的“梦游”,只因王师还未北定中原,收复故土。

高考题新题知识点

高考题新题知识点

高考题新题知识点近年来,随着高考改革的不断推进,考试题目的变化成为了考生们热议的话题。

为了适应新的高考模式,各科目的考试题目也在不断变化和升级。

本文将对一些高考科目的新题知识点进行探讨。

语文科目是高考中的必考科目之一,也是考生备考的重点。

随着语文教材的不断更新和改革,高考语文试题也出现了新的变化。

从过去的阅读理解、古文阅读到如今的现代文阅读,语文试题的形式和内容都出现了新的变化。

新题的知识点主要涉及到现代文阅读、阅读理解、综合能力等方面。

考生需要掌握的知识点包括如何理解现代文中的隐喻和比喻,如何熟练运用推理和判断能力解答阅读理解题目等。

数学科目是高考中的另一门重点科目,也是考生备考的难点。

数学试题的难点主要体现在题目的综合性和灵活性上。

新题的知识点主要涉及到数与代数、函数与方程、立体几何等方面。

考生需要掌握的知识点包括如何灵活运用代数等数学方法解题,如何综合运用知识点解答与现实生活相关的问题等。

英语科目是高考中比较重要的一门科目,也是考生备考的难点。

英语试题的难点主要体现在题目的语法和词汇理解上。

新题的知识点主要涉及到阅读理解、写作表达、语法运用等方面。

考生需要掌握的知识点包括如何理解长篇阅读材料中的主题和中心思想,如何构建自己的写作思路以及如何熟练运用语法知识解答题目等。

化学科目是高考理科中的一门重点科目,也是考生备考的难点。

化学试题的难点主要体现在题目的理论与实践结合的程度上。

新题的知识点主要涉及到有机化学、无机化学等方面。

考生需要掌握的知识点包括如何理解有机化学中的化学反应和原理,如何应用无机化学的知识解答实验题等。

物理科目是高考理科中的另一门重点科目,也是考生备考的难点。

物理试题的难点主要体现在题目的计算和推理上。

新题的知识点主要涉及到力学、光学等方面。

考生需要掌握的知识点包括如何灵活运用力学公式解答计算题,如何理解光学中的光的传播规律,以及如何推理解答与现实生活相关的问题等。

综上所述,高考题的新题知识点主要涉及到语文、数学、英语、化学、物理等科目。

高考英语新题型分析(PPT)3-3

高考英语新题型分析(PPT)3-3
一 高考题型的变化
普通高等学校招生全国统一考试大纲补充说明〈英语 科〉》提出了新题型“完成句子”,并有明确的 表述:“每题在一句话中留出空白,要求考生根 据括号内的汉语提示,用句末括号内的单词完成 句子。本节测试的重点为英语语言知识的综合应 用。”这种题型对于高中学生而言并不陌生,该 题性不仅大量出现在现行英语课本中,在平时的 单元性或阶段测试中也是一个惯用的“老”题型。
“ Байду номын сангаас成句子”的应对
一. 审题须严
英语句子部分
这种题型的题干由三个部分组成 汉语提示部分
英语单词提示 英语句子部分是主干,能提供重要的时态,语态甚至结 构暗示,是一个独立的语境,如:
1. It couldn‘t have rained (不可能下雨)last night, for the ground is still dry. (rain)) 2, Having been told (告知)many times, he still repeated the same mistakes. (tell)
玉米 玉米 ,保证抗倒性比较强、抗病性能好。抗倒性强的品种茎秆坚硬、根系发达。抗病性强的品种高群体下抗叶斑病,如东疏镇种植的郑单8、农大8、 登海号、鲁单8等。选用包衣的良种,种子纯度高于%,出芽率高于8%,净度高于8%。若实行单粒精播,种子出芽率应在%以上。 [] 精细播种随着机械化 程度的提高,为玉米套种改直播; 炒股配资 创造了条件,同时也有利于推广玉米机械化播种,保证一播全苗,苗匀苗壮,提 高均匀性、整齐度。适宜播种期为月-日,一般播种.-.kg/hm,单粒播.万-8.万粒/hm。采用单粒点播机进行精量直播,一次完成施肥、播种,行距cm,株距 8cm,播种深度为cm,播种后根据土壤墒情及时浇水。 [] 选用耐密型品种,在中等肥力地块定苗控制为万株/hm,如农大8和登 竿 竿(张) 海号等大穗型品种; 在高肥力地块定苗控制为.万株/hm,如郑单8等品种;高产攻关田、示范田还要适当增加种植密度。 [] 套种玉米采用直播方式,要缩短玉米与小麦的共生期, 尽量避免出现弱小苗。苗期需控制氮肥用量,增施磷、钾肥和有机肥;另外,根据需要控制浇水,夏玉米生长期降雨与生长需水同步,除田间持水量小于% 外,各生育期一般不用浇水。定苗防止过密,大穗型品种一般不能超过万株/hm,中穗型不能超过8.万株/hm,高密度容易造成空秆、病害重、倒伏等问题, 导致中后期管理困难,影响产量。 [] 定苗 玉米在三叶期丛苗疏开,叶时可按株距定苗,要拔除病苗、弱苗、异株,留健壮苗;若遇缺苗断垄的地方,相邻 处要留双株补苗。 [] 土肥水管理 定苗后及时中耕,清垄灭茬,促进根部下扎。其中,防倒的关键 性措施是增施钾肥、苗期控水和防止过密。玉米根深才能 株壮和抗倒能力强,土壤旋耕-年后要深翻次。深松土壤cm,分次施氮肥,增施有机肥。 [] 在测土掌握地力的基础上,根据目标产量kg/hm以上,施肥量为 速效氮kg/hm以上、速效磷kg/hm以上、速效钾kg/hm以上,有条件的增施硫酸锌.kg/hm作底肥。 [] 肥料运筹为轻施苗肥、重施穗肥、补追花粒肥。苗肥在 玉米拔节前沿幼苗一侧开沟,将全部磷、钾、硫、锌肥与氮肥总量的%左右深施-cm,以促根壮苗;在玉米大喇叭口期(叶龄指数%-%,第-片叶展开)重施 穗肥,追施控制在总氮量的%,以促进穗大粒多;在籽粒灌浆期追施花粒肥,控制在总氮量的%,以增加千粒重、增强叶片的光合作用。施肥方式为沟施或 穴施,施后埋土浇水,以提高肥料利用率。水分管理上,应均

高考各科新题型知识点

高考各科新题型知识点

高考各科新题型知识点随着时代的不断进步和教育改革的推进,高考的形式也在不断演变和创新。

新的题型出现,要求考生更加全面地掌握相关知识点。

本文将介绍一些高考各科新题型的知识点,帮助考生更好地备考。

一、语文:阅读填空题阅读填空题是语文考试中的一种新题型,要求考生在给定的短文中填充适当的词语。

在做这类题目时,考生需要注意以下几点:1. 语境推断:通过上下文的提示,推测出适合填入的词语。

这需要考生对语法、逻辑和语境的理解和运用。

2. 修辞手法辨析:作者有时会通过修辞手法隐藏一些信息,考生需要善于发现并理解。

例如,比喻、拟人、夸张等手法可以帮助考生理解词语的真正含义和作用。

3. 上下文连贯:考生需要确保填入的词语在上下文中形成合理的连贯性,避免产生语义断裂。

二、数学:解决问题题解决问题题是数学考试的新题型,要求考生结合实际情境解决数学问题。

在解这类题时,考生可以参考以下几点:1. 理清问题:仔细阅读问题,将问题中的信息进行提取和整理。

有时,问题会在文字描述中隐藏一些关键信息,考生需要发现并分析。

2. 建立数学模型:基于问题的要求和给定的条件,考生需要将问题转化为数学模型,建立适当的方程或不等式。

3. 分析解决:通过利用数学方法解决问题。

考生需要熟练掌握解方程、求导、求极值等常用的数学技巧。

三、英语:信息匹配题信息匹配题是英语考试中的一种新题型,要求考生根据给定的文章和相关信息,将信息与文章中的具体段落进行匹配。

考生需要注意以下几点:1. 段落概括:通读全文,以获取整体的理解。

再根据每个段落的主题和关键词,将句子与相应的段落进行匹配。

2. 排除干扰选项:在选择答案时,注意排除那些与文章相悖的选项,保持逻辑的连贯性。

3. 抓住关键信息:准确把握文章的核心信息,理解作者的意图和观点。

四、物理:实验探究题实验探究题是物理考试中的一种新题型,要求考生根据所给的实验材料,回答与实验相关的问题。

在解答这类题目时,考生可以参考以下几点:1. 实验原理:理解实验操作的基本原理和步骤。

高考数学试题2024新高考新题型考前必刷卷03(参考答案)

高考数学试题2024新高考新题型考前必刷卷03(参考答案)

2024年高考考前信息必刷卷(新题型地区专用)03数学·答案及评分标准(考试时间:120分钟试卷满分:150分)第I 卷(选择题)一、选择题:本题共8小题,每小题5分,共40分,在每小题给出的四个选项中,只有一项是符合要求的。

12345678ADCDCDCD二、选择题:本题共3小题,每小题6分,共18分,在每小题给出的四个选项中,有多项符合题目的要求,全部选对的得6分,部分选对的得部分分,有选错的得0分。

91011ACDABDACD第II 卷(非选择题)三、填空题:本题共3小题,每小题5分,共15分。

12.{}113.28y x=14.②③④四、解答题:本题共5小题,共77分.解答应写出文字说明、证明过程或演算步骤。

15.(13分)【解析】(1)易知()24f x x x m '=-+,依题意()211410f m '=-⨯+=,解得3m =,(2分)此时()()()24313f x x x x x '=-+=--,当1x <或3x >时,()0f x ¢>;当13x <<时,()0f x '<,即函数()f x 在(,1)-∞,(3,)+∞上单调递增,在()1,3上单调递减,(5分)因此函数()f x 在1x =时取得极值,所以3m =.(6分)(2)由(1)得函数()f x 在()2,3上单调递减,在()3,4上单调递增;所以()()32min 13323333f x f n n ==⨯-⨯+⨯+=,(10分)由题意可得2n n >,解得01n <<,所以n 的取值范围为()0,1.(13分)16.(15分)【解析】(1)记事件i A 为“该型号新能源汽车参加碰撞测试的得分为i 分(1,3,5)i =”,则()512P A =,()313P A =,()1112P A =--1136=.(2分)记事件i B 为“该型号新能源汽车参加续航测试的得分为i 分(1,3,5)i =”,则()525P B =,()325P B =,()1215P B =--2155=.(4分)记事件C 为“该型号新能源汽车参加两项测试仅有一次为合格”,则()()()()51311513()P C P A B P A B P A B P A B =+++1111102122535651563=⨯+⨯+=⨯+⨯,则该型号新能源汽车参加两项测试仅有一次为合格的概率为310.(7分)(2)由题知离散型随机变量ξ的所有可能取值分别为2,4,6,8,10,111(2)6530P ξ==⨯=,(8分)11122(4)356515P ξ==⨯+=,(9分)1112123(6)25653510P ξ==⨯++⨯=,(10分)12121(8)25353P ξ==⨯+=,(11分)121(10)255P ξ==⨯=,(12分)则离散型随机变量ξ的分布列为ξ246810P1302153101315所以数学期望123()2468301510E ξ=⨯+⨯+⨯+⨯11106103515+⨯=.(15分)17.(15分)【解析】(1)连接1AB ,交1A B 于点E ,连接,NE ME ,(2分)则E 为1A B 的中点,因为M 为AB 的中点,所以ME 1AA ,且112ME AA =,因为N 为1DD 的中点,所以DN 111,2AA DN AA =,所以ME DN ,且ME DN =,所以四边形EMDN 为平行四边形,(5分)所以EN DM ,又因为DM ⊄平面1,A BN EN ⊂平面1A BN ,所以DM 平面1A BN .(6分)(2)由题意(1)及几何知识得,在直四棱柱1111ABCD A B C D -中,24AB AD ==,1,,AB AD AA 两两垂直,以A 为坐标原点,分别以1,,AB AD AA 所在直线为x 轴、y 轴、z 轴建立如图所示的空间直角坐标系.(8分)设12(0)AA t t =>,则()()4,0,0,0,2,0B D ,()()()10,0,2,2,0,0,0,2,A t M N t ,()()()114,0,2,2,2,0,0,2,B t DM A N t =-=-.设异面直线DM与1A N所成角为θ,则111cos cos,DM A NDM A NDM A Nθ⋅===⋅,解得:1t=,(10分)故()()()110,0,2,0,2,1,4,0,2A N B,则()()()1114,0,2,0,2,1,0,0,2A B A N BB=-=-=设平面1A BN的一个法向量为(),,n x y z=,1B到平面1A BN的距离为d.所以110,0,A B nA N n⎧⋅=⎪⎨⋅=⎪⎩即420,20,x zy z-=⎧⎨-=⎩取2z=,得()1,1,2n=.(12分)所以13B B ndn⋅==,即1B到平面1A BN(15分)18.(17分)【解析】(1)由题设得22223bcaa b c=⎧⎪⎪=⎨⎪=+⎪⎩,解得212a=,所以C的方程为221124x y+=;(5分)(2)由题意可设:(2)ABl y kx m m=+≠,设()11,A x y,()22,B x y,由221124y kx mx y=+⎧⎪⎨+=⎪⎩,整理得()2221363120k x kmx m+++-=,()()()222222Δ36413312121240k m k m k m=-+-=-+>.由韦达定理得212231213mx xk-=+,122613mkx xk-+=+,由4PA PB ABk k k+=得1212224y y kx x--+=,(9分)即1212224kx m kx m k x x +-+-+=,整理得()22(2)24mk m m k -=-,因为0k ≠,得220m m --=,解得2m =或1m =-,2m =时,直线AB 过定点(0,2)P ,不合题意,舍去;1m =-时,满足()2Δ36410k =+>,所以直线AB 过定点(0,1)-.(10分)(3))由(2)得直线:1AB l y kx =-,所以1(1)x y k=+,由221(1)1124x y k x y ⎧=+⎪⎪⎨⎪+=⎪⎩,整理得22221213120y y k k k ⎛⎫+++-= ⎪⎝⎭,21Δ3640k ⎛⎫=+> ⎪⎝⎭,由题意得12121212212F AF BS F F y y y y k =-=-=+因为2AF k =218k >,所以2108k <<,(13分)令t,(2,t ∈,所以12F AF B S t=-,在(2,t ∈上单调递减,所以12F AF B S的范围是⎝.(17分)19.(17分)【解析】[解](1)12a =,23a =,31a =;12b =,21b =,33b =.11a =,23a =,32a =;13b =,21b =,32b =.(5分)[证明](2)若k k a b =(1,2,,k n = ),则有1k k a n a =+-,于是12k n a +=.当n 为正偶数时,1n +为大于1的正奇数,故12n +不为正整数.(8分)因为1a ,2a ,…,n a 均为正整数,所以不存在满足k k a b =(1,2,,k n = )的数列{}n a .(10分)[解](3)(1)k c n k =--(1,2,,k n = ).因为(1)k c n k =+-,于是122(1)12[(1)2][(1)]n c c nc n n n n n +++=+-++-+++- 222(12)(1)(12)n n n =++++-+++ 2111(1)(1)(21)(1)(2)266n n n n n n n n =+-++=++.(17分)。

2010年高考英语上海阅读理解新题型复习3

2010年高考英语上海阅读理解新题型复习3

Not everyone is born with beautiful hair, but by learning a few about hair care , you can make your hair look its best. Healthy, attractive hair should look smooth, silky and shiny. Hair that is dull, dry, brittle or frizzy is unhealthy and unattractive. Everyday events such as shampooing, brushing and blow drying can do great damage to your hair, causing the dry, brittle, frizzy appearance.When you shampoo your hair, you should use a shampoo for your specific type of hair. If you have color treated hair, you should use a shampoo for chemically treated hair. If you are not sure what your hair type is or what type of shampoo to use, ask your hairdresser. Your hairdresser can recommend a specific shampoo and conditioner to keep your hair healthy and shiny.Brushing your hair can actually help improve the shine. If you have long hair that tends to tangle on the ends, you should start brushing on the ends to remove any tangles, and work your way up to the scalp. You should never brush wet hair. When hair is wet,it is much weaker than when it is dry. Wet hair will break very easily if it is not combed very gently. If you have long hair, you should squeeze the extra water from your hair with a towel. Never rub your hair between the towel to dry it, this can cause severe breakage. Before combing, a leave-in conditioner should be sprayed on the hair to help restore shine and help remove tangles. Using a wide tooth comb, comb hair from the ends and work your way up.Blow dryers are very convenient and many of us use them daily. If they are used incorrectly, they can cause severe heat damage to your hair. Blow drying can cause your ends to be dry, brittle and frizzy. You should allow your hair to air dry until it is about half way dry. Set your blow dryer on low or medium heat, and keep the blow dryer about six to eight inches away from your hair.If you follow these healthy hair practices, you should notice an improvement in the condition of your hair within two to four weeks, depending on how damaged your hair is. While you are working to improve the condition of your hair, see your hairdresser or visit your local beauty supply store for more information on available products.1. 1.A healthy hair looks like________, ________ and _________.2. Why should we never brush wet hair?3. You turn to ______________ or________________________________ for help if you aren’t sure which kind of shampoo is suitable for your hair.4. What mentioned above can damage our hair?_____________________________________________________________________Keys:1. smooth silky shiny2.Because it is much weaker than when it is dry. It breaks very easily.3. your hairdresser visit your local beauty supply store4. Everyday events such as shampooing, brushing and blow drying can do great damage to your hair. Section DDirections: Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words.A 69-year-old grandmother with no teeth of her own has eventually won a long legal battle to stop a Scottish regional council(政务委员会)adding fluoride(氟化物)chemical to the public water supply.In a case which has already cost the taxpayer £1,000,000, the judge ruled that it was beyond the powers of the local authority to add the chemical to the water in order to reduce tooth decay.At her home last night Mrs Catherine said fluoride to public drinking water made it into some kind of dirty soup. “Where would it stop?” she asked. “They mi ght come up with the idea of putting drugs into the water to keep the unemployed quiet.” It was a horrible poison, she said, that could have caused al kinds of diseases, including cancer.The judge, however, concluded that there was no evidence to suggest that the inclusion of fluoride in the water supply would have had a negative effect on pulpier health. Although the chemical might serve as an efficient and convenient means of achieving a beneficial effect on the dental health of consumers generally, he said, and its use was greatly favored by the dental profession, he could also understand why some members of the public, Mrs Catherin ,in particular, might be passionately opposed to the action of the Water Authority in assuming the right to improve public well-being without consulting the public in the first case. The Authority’s legal duty to provide “wholesome” water for public consumption which was both safe and pleasant to drink ,did not, he said, extend to their right to safeguard public health by chemical means.1.The local authority add the chemical to the water for the purpose of ________________.2.By saying “They might come up with the idea of putting drugs into the water to keep theunemployed quiet”, Mrs Catherine showed her ____________ towards the local authority.3. According to what the judge said in the passage, adding fluoride to the water .4. A 69-year-old grandmother with no teeth of her own stopped a Scottish regional council adding fluoride chemical to the public water supply by _______________________.Answers1.reducing tooth decay.2.anger and dissatisfaction3.wasn’t proved to be harmful4. taking the local council to court。

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Exercise 2Directions: Read the following sentences, for the blanks, there is a word given in the brackets. Fill in each of these blanks with the proper form of the given word.1. Some organizations work with government agencies to save and ________ (decrease) the numbers of threatened or endangered species.2. After a careful discussion, the two parties have made a rough plan but the details are ___________ (work) out later.3. In his attempt __________ (climb) the mountain, John fell and injured his backbone, which cost him the use of his legs.4. Independent learning give you the freedom _________ (tailor) your learning to your demanding lifestyle.5. At an Expo-themed forum in Shanghai's Yangpu District, Governments were also urged __________ (do) a good job in protecting local old buildings and culture while pursuing social and economic development.6. It is generally accepted that Chinese were the earliest ________ (play) football while the Europeans established the modern rules for football.7. If water becomes increasingly scarce in decades _________ (come), water shortage will become a hot issue all over the world.8. I will be surprised if you can get Calvin, who is a close-fisted man, _________ (buy) these donation draw tickets from you.9. _________ (calm) customers, the Hong Kong company said the amount of the chemical in the shampoo products wouldn't harm people's health.10. You will know what it is like ________ (spend) most of your time listening to dull reports in a meeting room.11. The children in Sichuan look forward with hope ________ (get) a chance to receive further education in their rebuilt hometown.12. We need to find out all possible ways ________ (reduce) the growth of greenhouse gases in the atmosphere.13. ___________ (continue) next time! In the meantime, e-mail your particular application questions to our college e-mail address.14. I felt very happy _________ (admit) into the Bird's Nest to watch the performances that Jackie Chan hosted.15. Schools across China arc expected to hire 50, 000 college graduates this year as short-term teachers, almost three times the number hired last year, ___________ (help) reduce unemployment pressures.16. __________ (extinguish) different kinds of fires, several types of fire extinguisher have been invented.17. Around 15, 000 officials gathered in Copenhagen, trying to map out an effective strategy _________ (win) the battle against climate change.18. For the last two mornings, thousands of campaigners have queued for hours________ (gain) access to the conference venue (地点) manyunsuccessfully.19. Emily had the florist __________ (deliver) the bouquet directly to the church where the wedding would be held.20. The witness claimed __________ (see) a man outside the house, but he was not sure whether this was the man.21. Is this the best way you thought of __________ (stop) people getting into the dangerous areas?22. Mr. Green is said ___________ (do) the experiment which led to the new discovery in medicine.23. I have heard both teachers and students __________ (speak) well of him.24. Spread of 2009 HIN1 virus is thought ___________ (occur) in the same way that seasonal flu spreads.25. Hearing Shen Xae and Zhao Hongbo eventually won a gold medal after over ten years' hard work, I cannot but ___________ (admire) their courage and perseverance.26. The customers objected _______ (treat) unfairly in the course of shopping.27. At least 200, 000 people were reported ___________ (kill) in the ever recorded worst earthquake that struck Haiti last winter.28. Her husband and she.are now at work on a new dictionary ___________ (publish) next year.29. __________ (find) out more about Participant Service of Expo 2010, Shanghai China, call Hotline + 86 -21 - 962010.30.___________ (accommodate) the growing number of patients, the clinic has had to extend its service from five days to seven days a week.31. Ted and his friends established a website offering useful information about thunderstorms ___________ (prevent) similar accidents happening.32. ____________ (improve) his ability of speech, he has made use of each chance.33. Kathryn Bigelow, director of The Hurt Locker, was the first female ___________ (win) the best director Oscar.34. The 2010 World Expo __________ (hold) in Shanghai is expected to attract more than 70 million visitors from home and abroad.35. To our surprise, that top students in our class failed __________ (obtain) a scholarship.36. The vocabulary and grammatical differences between British and American English are so trivial and few as hardly ____________ (notice).37. We cannot help but ___________ (wonder) what unknown greatness human beings have has not yet been discovered.38. On my way back to the hotel last night, I lost my way in the complete darkness and, __________ (make) things worse, it began to pour.39. A high-tech park is announced _________ (build) in this area, but I don't know when the project will be put into practice.40. After the Arab states won their independence, great emphasis was laid on expanding education, with girls as well as boys __________ (encourage).41. Mr. Crossett was made __________(give) up his experiment because of his poor health and old age.42. The project __________ (accomplish) by the end of 2011, will expand the city's telephone network to cover 2, 000, 0O0 users.63. Qatar will be the first country in the Middle East __________ (host) the World Cup.44. ___________ (become) a successful fish scientist, you need to have a curious mind and be able to work on your own.45. To a high school student, going to university means a new leaf _________ (turn) before him and being independent is the starting point.46. After a day's tiring work, the manager prefers taking a walk along the river bank __________ (refresh) himself.47. Passengers on beard aren't allowed _________ (make) or receive calls during take-off.48. It took a long time for the human responsibility ___________ (build) on environment issues.49. If you "Look the other way" while something bad is happening, that means you choose _____________ (ignore) that thing.50. -- Will the plan ____________ (promote) the libraries nationally be carried out in the coming year?-- It all depends, I suppose.1. decrease2. to be worked3. to climb4. totailor 5.to do 6. to play 7. to come 8. to buy9. To calm 10. to spend 11. to getting 12. to reduce13.To be continued 14. to be admitted 15. to help16. To extinguish 17. to win 18. to gain 19. deliver 20.to have seen 21. to stop 22. to have done 23.speak 24. to occur 25. admire 26. to beingtreated 27. to have been killed 28. to be published 29.To find 30. To accommodate 31. to prevent 32. Toimprove 33. to win 34. to be held 35. to obtain 36.to be noticed 37. wonder 38. to make 39. to be built40.tobe encouraged 41. to give 42. to beaccomplished 43. to host 44. To become 45. to beturned 46. to refresh 47. to make 48. to bebuilt 49. to ignore 50. to promote。

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