重庆市第一中学2020届高三英语3月月考试题(PDF)
重庆一中2020-2021学年度初2023届第一次月考试题(图片版无答案)
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重庆市巴蜀中学2020届高三高考适应性月考(七)英语试题 PDF版含答案
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故选 B。
英语参考答案·第 3 页(共 12 页)
26.C 推理判断题。根据第三段“Inside one of the schools,some of the classrooms have low benches and desks.In others,the little girls sit on the floor,books in their laps.”等 内容可知,在印度公立学校的教学设施很差,不令人满意。故选 C。
第二节 【语篇导读】本篇是说明文。对于读者如何做一个有责任感的人提出建议。
36.C 考查上下文衔接。本题虽然位于段首,却不是主题句。C 项与后句构成转折关系。故 选 C。
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27.B 主旨大意题。本文由两个印度学生读书的事例,引出对印度现在的教育现状和面临 挑战的探讨,因此 B 项为最佳答案。故选 B。 C
【语篇导读】本篇是社科文。介绍了美国的浪漫主义思潮的开始及特点。 28.B 事实细节题。根据第二段第三句“This was a time of growth and expansion and their
Yours sincerely,
英语参考答案·第 2 页(共 12 页)
【解析】
Li Hua
第二部分 阅读理解
第一节 A
2021届重庆市第一中学校高三上学期第三次月考数学试题(解析版)
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2021届重庆市第一中学校高三上学期第三次月考数学试题一、单选题1.复数z 满足21iz i=-,则复数z 的虚部为()A .﹣1B .1C .iD .﹣i【答案】B【分析】利用复数的除法运算化简211ii i=-+-,再利用复数的代数形式求出结果.【详解】解:∵()()()()2121211112i i i i i z i i i i ++====-+--+,则复数z 的虚部为1.故选:B .【点睛】本题考查复数的除法运算.复数的除法运算关键是分母“实数化”,其一般步骤如下:(1)分子、分母同时乘分母的共轭复数;(2)对分子、分母分别进行乘法运算;(3)整理、化简成实部、虚部分开的标准形式.2.已知集合{}22,A xx x Z =<∈∣,则A 的真子集共有()个A .3B .4C .6D .7【答案】D【分析】写出集合{1,0,1}A =-,即可确定真子集的个数.【详解】因为{}22,{1,0,1}A xx x Z =<∈=-∣,所以其真子集个数为3217-=.故选:D.【点睛】本题考查集合的真子集个数问题,属于简单题.3.已知某圆锥的母线长为4,底面圆的半径为2,则圆锥的全面积为()A .10πB .12πC .14πD .16π【答案】B【分析】首先求得底面周长,即侧面展开图的扇形弧长,然后根据扇形的面积公式即可求得侧面积,即圆锥的侧面积,再求得圆锥的底面积,侧面积与底面积的和就是全面积.【详解】底面周长是:2×2π=4π,则侧面积是:14π48π2⨯⨯=,底面积是:π×22=4π,则全面积是:8π+4π=12π.故选B .【点睛】本题考查了圆锥的全面积计算,正确理解圆锥的侧面展开图与原来的扇形之间的关系是解决本题的关键,理解圆锥的母线长是扇形的半径,圆锥的底面圆周长是扇形的弧长.4.为了衡量星星的明暗程度,古希腊天文学家喜帕恰斯在公元前二世纪首先提出了星等这个概念.星等的数值越小,星星就越亮;星等的数值越大它的光就越暗.到了1850年,由于光度计在天体光度测量的应用,英国天文学家普森又提出了亮度的概念,天体的明暗程度可以用星等或亮度来描述.两颗星的星等与亮度满足()12212.5lg lg m m E E -=-,其中星等为k m 的星的亮度为(1,2)k E k =.已知“心宿二”的星等是1.00,“天津四”的星等是1.25,则“心宿二”的亮度大约是“天津四”的()倍.(当||x 较小时,2101 2.3 2.7x x x ≈++)A .1.27B .1.26C .1.23D .1.22【答案】B【分析】把已知数据代入公式计算12E E .【详解】由题意211 1.25 2.5(lg lg )E E -=-,12lg0.1E E =,∴0.1212101 2.30.1 2.70.1 1.257 1.26E E =≈+⨯+⨯=≈.故选:B .【点睛】本题考查数学新文化,考查阅读理解能力.解题关键是在新环境中抽象出数学知识,用数学的思想解决问题.5.向量,a b 满足||1a = ,a 与b 的夹角为3π,则||a b - 的取值范围为()A .[1,)+∞B .[0,)+∞C .1,2⎡⎫+∞⎪⎢⎣⎭D .3,2⎫+∞⎪⎢⎪⎣⎭【答案】D【分析】把||a b -用数量积表示后结合函数的性质得出结论.【详解】22222||()2121cos 3a b a b a a b b b b π-=-=-⋅+=-⨯⨯+ 21b b -+= 2134423b ⎛⎫=+≥⎪⎝⎭- ,所以3||2a b -≥ .1||2b = 时取得最小值.故选:D .【点睛】本题考查平面向量的模,解题关键是把模用向量的数量积表示,然后结合二次函数性质得出结论.6.已知三棱锥P ABC -,过点P 作PO ⊥面,ABC O 为ABC ∆中的一点,,PA PB PB PC ⊥⊥,PC PA ⊥,则点O 为ABC ∆的()A .内心B .外心C .重心D .垂心【答案】D【分析】连接AO 并延长交BC 于一点E ,连接PO ,由于PA ,PB ,PC 两两垂直可以得到PA ⊥面PBC ,而BC ⊂面PBC ,可得BC ⊥PA ,由PO ⊥平面ABC 于O ,BC ⊂面ABC ,PO ⊥BC ,可得BC ⊥AE ,同理可以证明CO ⊥AB ,又BO ⊥AC .故O 是△ABC 的垂心.【详解】连接AO 并延长交BC 于一点E ,连接PO ,由于PA ,PB ,PC 两两垂直可以得到PA ⊥面PBC ,而BC ⊂面PBC ,∴BC ⊥PA ,∵PO ⊥平面ABC 于O ,BC ⊂面ABC ,∴PO ⊥BC ,∴BC ⊥平面APE ,∵AE ⊂面APE ,∴BC ⊥AE ;同理可以证明CO ⊥AB ,又BO ⊥AC .∴O 是△ABC 的垂心.故选D .【点睛】本题主要考查了直线与平面垂直的性质,解题时要注意数形结合,属于基本知识的考查.7.设sin5a π=,b =,2314c ⎛⎫= ⎪⎝⎭,则()A .a c b <<B .b a c <<C .c a b<<D .c b a<<【答案】C【分析】借助中间量1和12比较大小即可.【详解】解:由对数函数y x =在()0,∞+单调递增的性质得:1b =>=,由指数函数12xy ⎛⎫= ⎪⎝⎭在R 单调递减的性质得:2413311142212c ⎛⎫⎛⎫⎛⎫= ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭=<=,由三角函数sin y x =在0,2π⎛⎫ ⎪⎝⎭上单调递增的性质得1sin sin 562a ππ=>=.所以c ab <<.故选:C.【点睛】本题考查利用函数的单调性比较大小,考查运算能力,化归转化思想,是中档题.本题解题的关键在于借助中间量1和12,尤其在比较a 与c 的大小时,将c 变形得24331142c ⎛⎫⎛⎫= ⎪ =⎪⎝⎭⎝⎭,进而与12比较大小是重中之核心步骤.8.已知三棱锥P ABC -的四个顶点均在同一个确定的球面上,且BA BC ==,2ABC π∠=,若三棱锥P ABC -体积的最大值为3,则其外接球的半径为()A .2B .3C .4D .5【答案】A【分析】由题意分析知三棱锥P ABC -体积的最大时,P ,O ,O '共线且O P '⊥面ABC ,P 在大于半球的的球面上,根据棱锥体积公式求得||O P ',进而应用勾股定理求外接球的半径.【详解】由题意知:AC 中点O '为面ABC 外接圆圆心,若外接球球心为O ,半径为R ,三棱锥P ABC -体积的最大时,P ,O ,O '共线且O 在P ,O '之间,∴1||33P ABC ABC V S O P -'=⋅⋅= ,1||||32ABC S BA BC =⋅⋅= ,即||3O P '=,||||32AC O C '==,所以()22222'|||'|33O C OC OO R R =-=--=,解得2R =,故选:A【点睛】关键点点睛:理解三棱锥P ABC -体积的最大时P 的位置及与球心、底面外接圆圆心的关系,结合棱锥体积公式、勾股定理求球体半径.二、多选题9.设m 、n 是两条不同的直线,α、β是两个不同的平面,下列命题中错误..的是()A .若,,//m n m n αβ⊂⊂,则//αβB .若,m n m α⊂⊥,则n α⊥C .若,m n αα^Ì,则m n ⊥D .若//,,m n αβαβ⊂⊂,则//m n【答案】ABD【分析】根据空间线、面关系,结合空间关系相关图例以及线线、线面、面面间的平行、垂直判定与性质,即可知选项的正误.【详解】A :,,//m n m n αβ⊂⊂,α、β不一定平行,错误.B :,m n m α⊂⊥,n 不一定垂直于α,错误.C :由线面垂直的性质:,m n αα^Ì,则必有m n ⊥,正确.D ://,,m n αβαβ⊂⊂,m 、n 不一定平行,错误.故选:ABD10.下列函数中,在(0,1)内是减函数的是()A .||12x y ⎛⎫= ⎪⎝⎭B .212log y x =C .121=+y x D .2log sin y x=【答案】ABC【分析】根据复合函数的单调性判断确定选项中各函数是否为减函数即可.【详解】A :1(2t y =为减函数,||t x =在(0,1)上为增函数,所以||12x y ⎛⎫= ⎪⎝⎭为减函数;B :12log y t =为减函数,2t x =在(0,1)上为增函数,所以212log y x =为减函数;C :1y t =为减函数,21t x =+在(0,1)上为增函数,所以121=+y x 为减函数;D :2log y t =为增函数,sin t x =在(0,1)上为增函数,所以2log sin y x =为增函数;故选:ABC【点睛】结论点睛:对于复合函数的单调性有如下结论1、内外层函数同增或同减为增函数;2、内外层函数一增一减为减函数;11.下列关于函数1()2sin 26f x x π⎛⎫=+⎪⎝⎭的图像或性质的说法中,正确的为()A .函数()f x 的图像关于直线83x π=对称B .将函数()f x 的图像向右平移3π个单位所得图像的函数为12sin 23y x π⎛⎫=+ ⎪⎝⎭C .函数()f x 在区间5,33ππ⎛⎫-⎪⎝⎭上单调递增D .若()f x a =,则1cos 232a x π⎛⎫-=⎪⎝⎭【答案】AD 【分析】令1262x k πππ+=+得到对称轴,即可判断A ;根据平移变换知识可判断B ;求出其单调增区间即可判断C ;利用配角法即可判断D.【详解】对于A ,令1262x k πππ+=+()k ∈Z ,解得22()3x k k Z ππ=+∈,当1k =时,得83x π=,故A 正确;对于B ,将函数()f x 的图像向右平移3π个单位,得112sin[()]2sin 2362y x x ππ=-+=,故B 错误;对于C ,令122()2262k x k k Z πππππ-+<+<+∈4244()33k x k k Z ππππ⇒-+<<+∈,故C 错误;对于D ,若12sin()26x a π+=,则11cos()sin[()]23223x x πππ-=+-=1sin()262ax π+=,故D 正确.故选:AD【点睛】方法点睛:函数()sin (0,0)y A x B A ωϕω=++>>的性质:(1)max min =+y A B y A B =-,.(2)周期2π.T ω=(3)由()ππ2x k k +=+∈Z ωϕ求对称轴(4)由()ππ2π2π22k x k k -+≤+≤+∈Z ωϕ求增区间;由()π3π2π2π22k x k k +≤+≤+∈Z ωϕ求减区间.12.定义在(0,)+∞上的函数()f x 的导函数为()'f x ,且()()f x f x x'<,则对任意1x 、2(0,)x ∈+∞,其中12x x ≠,则下列不等式中一定成立的有()A .()()()1212f x x f x f x +<+B .()()()()21121212x xf x f x f x f x x x +<+C .()1122(1)x x f f <D .()()()1212f x x f x f x <【答案】ABC【分析】构造()()f x g x x=,由()()f x f x x '<有()0g x '<,即()g x 在(0,)+∞上单调递减,根据各选项的不等式,结合()g x 的单调性即可判断正误.【详解】由()()f x f x x '<知:()()0xf x f x x'-<,令()()f x g x x =,则()()()20xf x f x g x x '-='<,∴()g x 在(0,)+∞上单调递减,即122112121212()()()()()g x g x x f x x f x x x x x x x --=<--当120x x ->时,2112()()x f x x f x <;当120x x -<时,2112()()x f x x f x >;A :121()()g x x g x +<,122()()g x x g x +<有112112()()x f x x f x x x +<+,212212()()x f x x f x x x +<+,所以()()()1212f x x f x f x +<+;B:由上得21121212()()()()x f x x x x f x x x -<-成立,整理有()()()()21121212x xf x f x f x f x x x +<+;C :由121x >,所以111(2)(1)(2)(1)21x x x f f g g =<=,整理得()1122(1)x x f f <;D :令121=x x 且121x x >>时,211x x =,12111()()()()g x g x f x f x =,12()(1)(1)g x x g f ==,有121()()g x x g x >,122()()g x x g x <,所以无法确定1212(),()()g x x g x g x 的大小.故选:ABC【点睛】思路点睛:由()()f x f x x '<形式得到()()0xf x f x x'-<,1、构造函数:()()f x g x x =,即()()()xf x f x g x x'-'=.2、确定单调性:由已知()0g x '<,即可知()g x 在(0,)+∞上单调递减.3、结合()g x 单调性,转化变形选项中的函数不等式,证明是否成立.三、填空题13.若一个球的体积为323π,则该球的表面积为_________.【答案】16π【解析】由题意,根据球的体积公式343V R π=,则343233R ππ=,解得2R =,又根据球的表面积公式24S R π=,所以该球的表面积为24216S ππ=⋅=.14.设向量a ,b 不平行,向量a b λ+ 与2a b + 平行,则实数λ=_________.【答案】12【解析】因为向量a b λ+ 与2a b + 平行,所以2a b k a b λ+=+ (),则{12,k k λ==,所以12λ=.【解析】向量共线.15.一般把数字出现的规律满足如图的模型称为蛇形模型:数字1出现在第1行;数字2,3出现在第2行;数字6,5,4(从左至右)出现在第3行;数字7,8,9,10出现在第4行,依此类推,则第21行从左至右的第4个数字应是____________.【答案】228【分析】由题知,第n 行有n 个数字,奇数行从右至左由小变大,偶数行从左至右由小变大,则前20行共有20(120)123202102+++++==L 个数字,第21行最左端的数为21021231+=,从左到右第4个数字为228.【详解】观察数据可知,第n 行有n 个数字,奇数行从右至左由小变大,偶数行从左至右由小变大,则前20行共有20(120)123202102+++++==L 个数字,第21行最左端的数为21021231+=,所以第21行从左到右第4个数字为228.故答案为:228.【点睛】关键点睛:本题考查合情推理、数列的前n 项和,解题关键要善于观察发现数据特征,考查了学生的逻辑思维能力、数据处理能力、运算求解能力,综合性较强,属于较难题型.四、双空题16.已知等比数列{}n a 的公比为q ,且101a <<,20201a =,则q 的取值范围为______;能使不等式12121110m m a a a a a a ⎛⎫⎛⎫⎛⎫-+-++-≤ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭ 成立的最大正整数m =______.【答案】(1,)+∞4039【分析】根据已知求得1a 的表达式,由此求得q 的取值范围.根据12121110m m a a a a a a ⎛⎫⎛⎫⎛⎫-+-++-≤ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭ 成立列不等式,化简求得m 的取值范围,从而求得最大正整数m .【详解】由已知201911201911a qa q =⇒=,结合101a <<知2019101q <<,解得1q >,故q 的取值范围为(1,)+∞.由于{}n a 是等比数列,所以1n a ⎧⎫⎨⎬⎩⎭是首项为11a ,公比为1q 的等比数列.要使12121110m m a a a a a a ⎛⎫⎛⎫⎛⎫-+-++-≤ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭ 成立则1212111m ma a a a a a +++≤+++ 即()111111111m m a q a q q q⎛⎫-⎪-⎝⎭≤--,将120191a q=代入整理得:40394039m q q m ≤⇒≤故最大正整数4039m =.故答案为:(1,)+∞;4039【点睛】本小题主要考查等比数列的性质,考查等比数列前n 项和公式,属于中档题.五、解答题17.在四棱柱1111ABCD A B C D -中,底面ABCD 是等腰梯形,M 是线段AB 的中点,1160,22,2,DAB AB CD DD C M ∠=︒====(1)求证:1//C M 平面11A ADD ;(2)求异面直线 CM 与1DD 所成角的余弦值.【答案】(1)证明见解析;(2)14.【分析】(1)易得1111//,C D MA C D MA =,则四边形11AMC D 为平行四边形,得到11//C M D A ,再利用线面平行的判定定理证明.(2)由//CM DA ,将异面直线CM 与1DD 成的角,转化为 DA 与1DD 相交所成的角,然后在1ADD ,利用余弦定理求解.【详解】(1)因为四边形ABCD 是等腰梯形,且2AB CD =,所以//AB DC .又由M 是AB 的中点,因此//CD MA 且CD MA =.如图所示:连接1AD ,在四棱柱1111ABCD A B C D -中,因为1111//,CD C D CD C D =,可得1111//,C D MA C D MA =,所以四边形11AMC D 为平行四边形.因此11//C M D A ,又1C M ⊄平面11A ADD ,1D A ⊂平面11A ADD ,所以1//C M 平面11A ADD .(2)因为//CM DA ,所以异面直线CM 与1DD 成的角,即为 DA 与1DD 相交所成的直角或锐角,在1ADD中,1C M =,所以111,2AD AD DD ===,由余弦定理可得:22211111cos 24AD DD AD ADD AD DD +-∠==-⋅,所以异面直线CM 和1DD 余弦值为14.【点睛】方法点睛:判断或证明线面平行的常用方法:(1)利用线面平行的定义,一般用反证法;(2)利用线面平行的判定定理(a ⊄α,b ⊂α,a ∥b ⇒a ∥α),其关键是在平面内找(或作)一条直线与已知直线平行,证明时注意用符号语言的叙述;(3)利用面面平行的性质定理(α∥β,a ⊂α⇒a ∥β);(4)利用面面平行的性质(α∥β,a ⊄β,a ∥α⇒a ∥β).18.已知数列{}n a 满足:13a =,且对任意的n *∈N ,都有1,1,n n a a +成等差数列.(1)证明数列{}1n a -等比数列;(2)已知数列{}n b 前n 和为n S ,条件①:()1(21)n n b a n =-+,条件②:11n n n b a +=-,请在条件①②中仅选择一个条件作为已知条件.............来求数列{}n b 前n 和n S .【答案】(1)证明见解析;(2)答案不唯一,具体见解析.【分析】(1)由条件得121n n a a +=-,利用等比数列定义可得证.(2)选条件①得(21)2nn b n =+,选条件②得1(1)()2nn b n =+⋅利用错位相减法可得解.【详解】(1)由条件可知112n n a a ++=,即121n n a a +=-,∴()1121n n a a +-=-,且112a -=∴{}1n a -是以112a -=为首项,2q =为公比的等比数列,∴12nn a -=,∴()21nn a n N*=+∈(2)条件①:()1(21)(21)2nn n b a n n =-+=+,123325272(21)2nn S n =⋅+⋅+⋅+++⋅ 23412325272(21)2n n S n +=⋅+⋅+⋅+++⋅利用错位相减法:123413222222222(21)2nn n S n +-=⋅+⋅+⋅+⋅++⋅+⋅- 118(12)6(21)212n n n S n -+--=++⋅--化简得()12(21)2n n S n n N +*=-+∈条件②:11(1)()12nn n n b n a +==+⋅-231111234(1)2222n nS n =⋅+⋅+⋅+++⋅ 234111111234(1)22222n n S n +=⋅+⋅+⋅+++⋅ 利用错位相减法:23411111111(1)222222n n n S n +=++++-+⋅ 1111[1()]11421(1)12212n n n S n -+-=+-+⋅-化简得()13(3)(2n n s n n N *=-+∈【点睛】错位相减法求和的方法:如果数列{}n a 是等差数列,{}n b 是等比数列,求数列{}n n a b 的前n 项和时,可采用错位相减法,一般是和式两边同乘以等比数列{}n b 的公比,然后作差求解;在写“n S ”与“n qS ”的表达式时应特别注意将两式“错项对齐”以便下一步准确写出“n n S qS -”的表达式19.已知椭圆C 的两个焦点分别为12(1,0),(1,0)F F -,短轴的两个端点分别为12,B B .且122B B =.(1)求椭圆C 的标准方程;(2)过点2F 的直线l 与椭圆C 相交于P ,Q 两点,且11F P FQ ⊥ ,求直线l 的方程.【答案】(1)2212x y +=;(2)10x +-=,或10x -=.【分析】(1)由题干条件可得c 和b 的值,进而求出2a 的值,从而求出椭圆方程;(2)首先考虑斜率不存在的情况,不符合题意;当斜率存在时,联立方程,可得()22121222214,2121k k x x x x k k -+=⋅=++,又110F P FQ ⋅= ,向量坐标化可得()()()2221212111110k x x k x x k F P FQ ⋅--==++++uuu r uuu r ,代入1212,x x x x +⋅,化简,即可求出k 的取值,从而求出直线方程.【详解】解(1)由条件可知:1c =,又122B B =,所以1b =,则22a =,所以椭圆C 的方程为2212x y +=(2)当直线l 的斜率不存在时,其方程为1x =,不符合题意;当直线l 的斜率存在时,设直线l 的方程为(1)y k x =-,22(1)12y k x x y =-⎧⎪⎨+=⎪⎩得()()2222214210k x k x k +-+-=,()2810k ∆=+>,设()()1122,,,P x y Q x y ,则()22121222214,2121k k x x x x k k -+=⋅=++,()()1111221,,1,F P x y F Q x y =+=+ ,∵110F P FQ ⋅= ,即()()()()()22212121212111110x x y y k x x k x x k +++=+--+++=,即()()()222222221411()102121k k kk k k k -+--++=++化简得:2201172k k =+-解得217,77k k ==±.故直线l的方程为10x +-=,或10x --=.【点睛】方法点睛:(1)将向量转化为坐标的关系;(2)联立直线和椭圆,求出两根之和,两根之积;(3)将两根之和和两根之积代入坐标关系中,解出k .20.已知()cossin 222x x x f x ⎛⎫=+ ⎪⎝⎭,记ABC 的内角,,A B C 的对边分别为,,a b c .(1)求()f B 的取值范围;(2)当4a =,433b =,且()f B 取(1)中的最大值时,求ABC 的面积.【答案】(1)30,12⎛+ ⎝⎦;(2)833或433【分析】(1)利用公式对函数化简,根据B 角的范围,求函数值域.(2)由(1)求出B 的大小,利用正弦定理和三角形面积公式即可求出结果.【详解】(1)2()cossin sin cos 222222x x x x x x f x ⎛⎫=+=+ ⎪⎝⎭13(cos 1)3sin sin 2232x x x π+⎛⎫=+=++ ⎪⎝⎭因为B 为三角形的内角,所以(0,)B π∈所以4,333B πππ⎛⎫+∈ ⎪⎝⎭,所以3()0,12f B ⎛∈+ ⎝⎦(2)34()11,,23333f B B B ππππ⎛⎫⎛⎫=++=+∈ ⎪ ⎝⎭⎝⎭,,326B B πππ∴+==,由正弦定理得:4343sin 1sin sin sin 22a b A A B A =⇒=⇒=()0,,3A A ππ∈∴=,或23A π=,若3A π=,则2C π=,183sin 23ABC S ab C ==若23π=A ,则6π=C,1sin 23==ABC S ab C 【点睛】本题考查了三角恒等变换、正弦定理和三角形面积公式等基本数学知识,考查了数学运算能力和逻辑推理能力,属于中档题目.21.在直三棱柱111ABC A B C -中,112,120,,AB AC AA BAC D D ==∠=分别是线段11,BC B C 的中点,过线段AD 的中点P 作BC 的平行线,分别交,AB AC 于点,M N .(1)证明:平面1A MN ⊥平面11ADD A ;(2)求二面角1A A M N --的余弦值.【答案】(1)证明见解析;(2)155.【分析】(1)根据线面垂直的判定定理即可证明MN ⊥平面ADD 1A 1;又MN ⊂平面A 1MN ,所以平面A 1MN ⊥平面ADD 1A 1;(2)建立空间坐标系,利用向量法求出平面的法向量,利用向量法进行求解即可.【详解】(1)证明:∵AB=AC ,D 是BC 的中点,∴BC ⊥AD ,∵M ,N 分别为AB ,AC 的中点,∴MN ∥BC ,∴MN ⊥AD ,∵AA 1⊥平面ABC,MN ⊂平面ABC ,∴AA 1⊥MN ,∵AD,AA 1⊂平面ADD 1A 1,且AD∩AA 1=A ,∴MN ⊥平面ADD 1A 1∴,又MN ⊂平面A 1MN ,所以平面A 1MN ⊥平面ADD 1A 1;(2)设AA 1=1,如图:过A 1作A 1E ∥BC ,建立以A 1为坐标原点,A 1E ,A 1D 1,A 1A 分别为x ,y ,z 轴的空间直角坐标系如图:则A 1(0,0,0),A(0,0,1),∵P 是AD 的中点,∴M ,N 分别为AB ,AC 的中点.则31,,122M ⎛⎫ ⎪ ⎪⎝⎭,31,,122N ⎛⎫- ⎪ ⎪⎝⎭,则131,,122A M ⎛⎫= ⎪ ⎪⎝⎭,()10,0,1A A =,)NM = ,设平面AA 1M 的法向量为(),,m x y z=,则100m AM m A A ⎧⋅=⎪⎨⋅=⎪⎩,得10220x y z z ++=⎨⎪=⎩,令1x =,则y =,则()1,m =,同理设平面A 1MN 的法向量为(),,n x y z=,则100n A M n NM ⎧⋅=⎨⋅=⎩,得310220x y z ++=⎪⎨⎪=⎩,令2y =,则1z =-,则()0,2,1n =-,则()15cos ,5m n m n m n ⋅===-⋅,∵二面角A-A 1M-N 是锐二面角,∴二面角A-A 1M-N 的余弦值是155.【点睛】本题主要考查直线垂直的判定以及二面角的求解,建立空间直角坐标系,利用向量法进行求解,综合性较强,运算量较大.22.已知21()(1)2xf x e ax b x =---.其中常数 2.71828e ≈⋅⋅⋅⋅⋅⋅.(1)当2,4a b ==时,求()f x 在[1,2]上的最大值;(2)若对任意0,()a f x >均有两个极值点()1212,x x x x <,(ⅰ)求实数b 的取值范围;(ⅱ)当a e =时,证明:()()12f x f x e +>.【答案】(1)max ()1f x e =-;(2)(ⅰ)1b >;(ⅱ)证明见解析.【分析】(1)由题得2()4(1)x f x e x x =---,()24x f x e x '=--,()2x f x e ''=-,由[1,2]x ∈,可得()0f x ''>,即()'f x 在[1,2]上单增,且2(2)80f e -'=<,即()0f x '<,可知()f x 在[1,2]上单减,求得max ()(1)1f x f e ==-.(2)(ⅰ)利用两次求导可得(,ln )x a ∈-∞时,()'f x 单减;(ln ,)x a ∈+∞时,()'f x 单增,再由()f x 有两个极值点,知(ln )ln 0f a a a a b =--<',即ln b a a a >-恒成立,构造函数()ln g a a a a =-,利用导数求其最大值,可得实数b 的取值范围;(ⅱ)设()()(2),(1)h x f x f x x ''=--<,求导可得()h x 在(,1)-∞单增,得到()(2)f x f x ''<-,可得()()112f x f x ''<-,()()122f x f x ''->,结合()'f x 在(1,)+∞上单增,可得()()122f x f x >-,得到()()()()2222122222222x x f x f x f x f x e e ex ex e -+>-+=+-+-,构造22()22x x M x e e ex ex e -=+-+-,(1)x >,再利用导数证明()2(1)M x M e >=,即可得到()()12f x f x e+>【详解】(1)由2,4a b ==得,2()4(1)x f x e x x =---,求导()24x f x e x '=--,()2x f x e ''=-,[1,2]x ∈ ,2[,]x e e e ∴∈,20x e ∴->,即()0f x ''>()f x '∴在[1,2]上单增,且2(2)80f e -'=<,即[1,2]x ∀∈,()0f x '<,()f x ∴在[1,2]上单减,max ()(1)1f x f e ∴==-.(2)(ⅰ)求导()x f x e ax b '=--,因为对任意0,()a f x >均有两个极值点12,x x ,所以()0f x '=有两个根,求二阶导()x f x e a ''=-,令()0f x ''=,得ln x a=当(,ln )x a ∈-∞时,()0f x ''<,()'f x 单减;当(ln ,)x a ∈+∞时,()0f x ''>,()'f x 单增,由()0f x '=有两个根12,x x ,知(ln )ln 0f a a a a b =--<',即ln b a a a >-对任意0a >都成立,设()ln g a a a a =-,求导()ln g a a '=-,令()0g a '=,得1a =,当(0,1)x ∈时,()0g a '>,()g a 单增;当(1,)x ∈+∞时,()0g a '<,()g a 单减,max (()1)1g g a =∴=,1b ∴>又0,,()ba b f e x f x a -⎛⎫''-=>→+∞→+∞ ⎪⎝⎭Q ,所以实数b 的取值范围是:1b >.(ⅱ)当a e =时,()x f x e ex b '=--,()x f x e e ''=-,令()0f x ''=,得1x =当(,1)x ∈-∞时,()0f x ''<,()'f x 单减;当(1,)x ∈+∞时,()0f x ''>,()'f x 单增,又12,x x 是()0f x '=的两根,且12x x <,121,1x x <∴>,121x ∴->设()()(2),(1)h x f x f x x ''=--<,即22(2)2()2,(1)xxx xe ex b ee x b e e ex e x h x --⎡⎤=-=-------+<⎣⎦,则2()2220x x h x e e e e e -=+->-='()h x ∴在(,1)-∞单增,()(1)0h x h ∴<=,即()(2)f x f x ''<-又11,x <,()()112f x f x ''∴<-,()()122f x f x ''∴->又()f x ' 在(1,)+∞上单增,122x x ∴->,即1222x x x <-<,又()f x 在()12,x x 上单减,()()122f x f x ∴>-()()()()2222122222222x x f x f x f x f x e e ex ex e-∴+>-+=+-+-令22()22x x M x e e ex ex e -=+-+-,(1)x >则2()22x x M x e e ex e -'=--+,2()20x x M x e e e -''=+-≥()M x '∴在(1,)+∞单增,且(1)0M '=,()0M x '∴>,故()M x 在(1,)+∞单增又21x > ,()2(1)M x M e ∴>=,即()()12f x f x e+>【点睛】方法点睛:本题考查利用导数研究函数的单调性,求极值,最值,以及证明不等式,证明不等式的方法:若证明()()f x g x <,(,)x a b ∈,可以构造函数()()()F x f x g x =-,如果()0F x '<,则()F x 在(,)a b 上是减函数,同时若()0F a ≤,由减函数的定义可知(,)x a b ∈时,有()0F x <,即证明了()()f x g x <,考查学生的函数与方程思想,化归与转化思想,考查逻辑思维能力与推理论证能力,属于难题.。
2020届雅礼中学高三第3次月考试卷答案(英语)
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&$3%!上下文串连!作者在第一段提出了自己的建议!下面解释自己的理由!首先作者建议用认真)理性的 态度考虑这个建议被接受后的结果!根据/+-20=-F;+的含义也可判断出!
&"3$!名词辨析!从文章第一句作者就表明自己要提出建议#因此选28@@+2.>0=!如果这样的建议被接受! &%3$!短 语 辨 析!2>.-/08=9 固 定 短 语#此 句 的 主 语 还 是 6-1>;>+2#根 据 下 文 的 .0@+.*+/-6.+/9>==+/-=9
-4.8-;;7.-;C.00=+-=0.*+/可知#是坐在那里相互交谈! &&3%!名词辨析!该空后的破折号是对空白处词的解释#这里指我们面临的许多问题! &'3#!上下文串连!1+=.-;>;;=+22"精神疾病&!这里指家庭缺少交流)理解而引起的往往是精神疾病! &(3$!名词辨析!由于全篇都在说明看电视多的不良后果#所以#此部分分析过多地将时间花在看电视上#导
也不行!+K+=表示强调! ''3$!名词辨析!针对上文的写不出句子#指出学习写作的途径是通过阅读! '(3%!名词辨析!指阅读的另一种形式...朗读! ')3"!上下文串连!阅读的那种安静时间可以变成讲故事的时间#这个时间一结束#电视网络系统就必须提供
好的节目来把人们再吸引回来!
'*3%!短语辨析!401+8:<>.*"提出)提供&#不能用被动语态,401+-4/022"偶遇&,401+-F08."发生#产生&, 401+08."出版#出现&!
重庆市巴蜀中学2020届高考英语适应性月考试题(七)答案
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巴蜀中学2020届高考适应性月考卷(七)英语参考答案第一部分听力(共两节,满分30分)1~5 ACBAB 6~10 BCACA 11~15 ABCBB 16~20 ABCBA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)21~25 BADCB 26~30 CBBCC 31~35 DBAAC第二节(共5小题;每小题2分,满分10分)36~40 CBDEA第三部分语言知识运用(共两节,满分45分)第一节(共20小题;每小题1.5分,满分30分)41~45 DABBD 46~50 ACDAC 51~55 ADBAB 56~60 CDACA第二节(共10小题;每小题1.5分,满分15分)61.lasting 62.is expected 63.another 64.truly 65.despite66.Elections 67.effective 68.who 69.involve 70.held 第四部分写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)When I was twelve,I went to a soccer field for the first time.I found∧hard to drag myself①itaway from it.But all I could do were make a paper one instead,so I did n’t have enough money to buy1②was ③because/fora football.Every day on my way home,I couldn’t help kick whatever on the road could be kicked.④kickingSeveral weeks late,I felt I was on top of the world.While I got home,a real black and white ball was⑤later ⑥Whenwaiting for me on my desk,in which was my birthday present from my parents.I was very wild with⑦⑧sojoy that I didn’t know what to say.I simply rushed out with a ball and playing with other kids until I⑨the ⑩playedwas completely tired out.第二节书面表达(满分25分)【参考范文】Dear Emily,Having known that you take interest in the Spring Festival in China,I am overwhelmed with eagerness to write to brief you on it and enclosed in my letter are two pictures specially taken during this Spring Festival.The Spring Festival is the grandest festival in China,when China is dominated by iconic red lanterns,loud fireworks,and massive banquets.The first picture was about my family members setting off fireworks on New Year’s Eve.It is believed that2doing so helps keep away evil spirits in general.The other was taken of our family reunion dinner,presenting a table brimful of various dishes.On that particular occasion,fish will be the main dish,as it is commonly held that this will help realize your wishes for the New Year.I do hope what I mentioned above will give you a better understanding of the Spring Festival and that you will have the chance to experience the Spring Festival atmosphere here yourself.Looking forward to your reply.Yours sincerely,Li Hua【解析】第二部分阅读理解第一节A【语篇导读】本篇是应用文。
重庆市第一中学2020-2021学年高三上期第三次月考英语试题及答案
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2020年重庆一中高2021届高三上期第三次月考英语测试试题卷第一部分听力(共两节,满分20分)第一节(共5小题,每小题1分,满分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三个选项中选岀最佳选项。
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. Where does the conversation probably take place?A. In a bank.B. In a restaurant.C. In a hospital.2. What will the woman most probably do this Friday?A. Do some shopping.B. Watch a movie.C. Organize a sales promotion.3. What does the woman think of the trip to Indonesia?A. Safe.B. Dangerous.C. Exciting.4. How much does the man make in a year?A. £49,000.B. £50,000.C. £ 60,000.5. What are the speakers mainly talking about?A. The man's travel experience.B. A flight to Romania.C. Family members.第二节听下面5段对话或独白。
每段对话或独白后有几个小题,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。
听每段对话或独白前,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。
每段对话或独白读两遍。
听下面一段对话,回答第6和第7两个小题。
6. Who bought the Christmas tree?A. The woman's grandpa.B. The woman's mother.C. The woman’s father.7. How old is the tree?A. 40 years old.B. 75 years old.C. 80 years old.听下面一段对话,回答第8和第9两个小题。
重庆市第一中学2020届高三3月模拟考试英语试题-含答案
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秘密★启用前【考试时间:3月29日15:00—17:00】2020年重庆一中高2020级高三下期3月月考英语试题卷2020.3.29英语试题卷共9页。
满分150分。
考试时间120分钟。
注意事项:1.答题前,务必将自己的姓名、准考证号填写在答题卡规定的位置上。
2.答选择题时,必须使用2B铅笔将答题卡上对应题目的答案标号涂黑,如需改动,用橡皮擦擦干净后,再选涂其他答案标号。
3.答非选择题时,必须使用0.5毫米黑色签字笔,将答案书写在答题卡规定的位置上。
4.所有题目必须在答题卡上作答,在试题卷上答题无效。
第Ⅰ卷Ⅰ.听力部分(共二节,每小题1分,满分20分)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。
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.What will the man do in the job interview?A.Keep smiling.B.Take notes.C.Speak loudly.2.What is the probable relationship between the speakers?A.Teacher and student.B.Doctor and patient.C.Husband and wife.3.What does the woman advise the man to do?A.Never complain about failure.B.Never care about exam results.C.Keep on trying hard.4.Why is the baby crying?A.He wishes to stay with his parents.B.He desires to drink milk.C.He wants to sleep.5.How much should a couple with two children pay for the tickets?A.15dollars.B.30dollars.C.60dollars.第二节(共15小题;每小题1.5分,满分22.5分)听下面5段对话或独白。
2020届高三第二学期第一月考英语英语科试题
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2020届高三第二学期第一月考英语科试题第一部分听力(共两节,满分30分)第一节听下面 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。
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.What is the weather like today?A. Cool.B. Warm.C. Hot.2. What does the man want?A. A one-dollar bill.B. Some coins.C. A parking place.3. What are the speakers discussing?A. Whether to hire more workers.B. How to improve production.C. When to put the new orders.4. Where are the speakers?A. In a park.B. In a lift.C. On a bus.5. What has the woman done?A. She has changed her car for a new one.B. She has taken a new car for a test drive.C. She has finished recording a radio program.第二节听下面 5 段对话或独白。
每段对话或独白后有几个小题,从题中所给的A, B, C 三个选项中选出最佳选项。
听每段对话或独白前,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。
每段对话或独白读两遍。
听下面一段对话,回答第 6 和第7 两个小题。
6. When will the man leave the hotel?A. On October 22nd.B. On October 25th.C. On October 26th.7. How much will the man pay for the room?A. $ 70.B. $ 280.C. $400.听下面一段对话,回答第8 和第9 两个小题8. Why didn’t the man choose the £12.50 tickets?A. The tickets weren’t enough.B. The time was not suitable.C. The seats were at the back.9. Which circus tickets did the man decide to buy?A. The £15.00 ones.B. The £15.50 ones.C. The £17.50 ones.听下面一段对话,回答第10 至第12 三个小题。
2021届高考英语大一轮复习语言知识运用第一节单项选择定语从句精品试题(含2021试题)新人教版
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2021届高考英语大一轮复习语言知识运用第一节单项选择定语从句精品试题(含2021试题)新人教版1.(2020天津市十二区县重点学校高三毕业班联考一,6)The course normally attracts20 students per year, _______ up to half will be from overseas.A. in whichB. of whomC. of whichD. for whom[解析] 1.句意:这门课程在正常情形下每年会吸引20名学生,其中有一半的学生来自国外。
考查定语从句。
该非限制性定语从句修饰先行词20 student s,排除A、C两项;依照语境可知此处表达“在……中” ,应该用介词of,因此答案为B项。
2.(2020重庆市重庆一中高三下学期第一次月考,33)Being such a selfish man _____ no one liked, he could hardly find a person to celebrate his success.A. whatB. asC. thatD. which[解析] 2.句意:因为自己是那么一个自私的人,因此他几乎找不到一个和他一起庆祝自己成功的人。
空格处引导的是定语从句,该从句中缺少宾语,应该用关系代词,由于先行词前有such修饰,关系代词只能用as。
此处不是such……that……引导的结果状语从句。
3.(2020江西省重点中学协作体高三第一次联考,25)College graduates are offered lots of available jobs, ______, I believe, they can fully demonstrate their knowledge and competence.A. whereB. whichC. thatD. what[解析] 3.句意:我们给大学生提供了专门多工作机会,我认为在这些工作中他们能够充分展现他们的知识和能力。
重庆市第一中学2023届高三下学期3月月考化学 (无答案)
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2023年重庆一中高2023届3月月考化学试题卷一、选择题:本题共14小题,每小题3分,共42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.化学与生活生产密切相关,下列说法错误的是( ) A .用23Na CO 与()243Al SO 两种溶液制作泡沫灭火剂 B .4NH Cl 与2ZnCl 溶液可用作焊接金属的除锈剂 C .4BaSO 常用作医学上肠胃X 射线检查的造影剂 D .带有强亲水基团的聚丙烯酸钠常用作高吸水性树脂 2.下列化学用语表述正确的是( )A .基态铷原子最高能级的电子云轮廓图:B .2CS 的电子式:S C S ::::C .亚油酸(顺,顺-9,12-十八碳二烯酸)的结构简式:D .苯分子中的大π键示意图:3.常温下,下列各组离子在指定溶液中一定能大量共存的是( ) A .能使甲基橙变黄色的溶液中:2Mg +、3Fe +、227Cr O -、ClO -B .饱和2CO 溶液中:K +、2Ba +、3NO -、Cl -C .澄清透明溶液中:K +、2Fe +、24SO -、[]36Fe(CN)-D .由水电离的()141H110mol L c +--=⨯⋅的溶液中:Na +、K +、F -、I -4.下列叙述错误的是( )A .向22Na O 固体中分别通入2CO 和2SO 气体,均能得到大量2OB .过量3NH 分别通入3AgNO 溶液和32Cu(NO )溶液中,均可看到溶液先浑浊后澄清C .2SO 使溴水褪色与乙烯使4KMnO 溶液褪色的原型相同D .饱和34Na SO 溶液和浓硝酸均可使鸡蛋清溶液产生沉淀,但原理不同 5.下列实验装置(夹持装置略)及操作正确的是( )6.布洛芬、阿司匹林、酚麻美敏片均属于常见的解热镇痛抗炎药,下图所示X 、Y 、Z 分别是其有效成分分子的结构简式。
下列说法错误的是( )A .X 含1个手性碳,且与苯甲酸互为同系物B .Y 中所有的碳原子可能在同一平面上C .Z 苯环上的H 被Br 所取代,二溴代物有4种D .X 、Y 、Z 均能与23Na CO 反应产生2CO7.金属M 在潮湿的空气中会形成一层致密稳定的233M(XY)MZX ⋅。
2020届重庆市巴蜀中学高三英语月考试题及答案解析
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2020届重庆市巴蜀中学高三英语月考试题及答案解析第一部分阅读(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A、B、C、D四个选项中选出最佳选项AAs a nation, we are getting bigger and eating more. But there are effective ways to control your appetite and eat only as much as you need.Keep away from low-nutrition snacksThat means ice cream, sweets, chips biscuits, cakes and any other salty orsugary snacks you eat between meals. Although we have a tendency to eat them, you can learn to live without these unhealthy-and-fattening-additions to your diet. Try to make it a habit to eat them only when offered at social events or as a special treat.Leave half an hour between main course and dessertHaving a break between courses gives your brain time to receive the fullness signal and make you more likely to refuse the sweet stuff. And, in fact, as soon as you feel the first signals of fullness, remove your plate from the table. That will tell your brain that food time is over.Make yours a small helpingPut an end to super-sized portions. You won’t be missing out—today’s small was the medium or large of a few decade ago. Select or serve yourself a modest portion and eat it slowly enjoying the flavors. Before you know it, small will feel just right. What’s more, ordering the smaller size leads to wearing the smaller size.Distract yourselfWhen you find yourself hunting down food, even though you’re even hungry, do something else for 20 minutes. Drink a large glass of water as thirst is often confused with a desire for food. Choose something that engages your brain as well as your hands, such as writing a letter or listening to a song. You could also go for a short walk or do something that you enjoy. If you think you really are hungry, set an alarm for 20 minutes’ time and if you still want to eat when it rings, fine. If not, the urge will have passed.1. Which way suits you better if you tend to order a large portion of food?A. Distract yourself.B. Make yours a small helping.C. Keep away from low-nutrition snacks.D. Leave half an hour between main course and dessert.2. Why should you have a break between main course and dessert?A. To give people time to chat.B. To have a good appetite for sweet stuff.C. To reduce appetite for dessert.D. To give the host time to remove your plate.3. When you find yourself pursuing for food, what should you do?A. Eat some biscuits.B. Eat some sugary snacks.C. Have some soft drinks.D. Listen to a lovely melody.BTeens who have good, supportive relationships with their teachers enjoy better healthas adults, according to research published by an American research center.“This research suggests that improving students' relationships with teachers could have positive and long-lasting effects beyond just academic success," said Jinho Kim, a professor atKoreaUniversityand author of the study."Itcould also bring about healthimplicationsin the long run.”Previous research has suggested that teens' social relationships might be linked to health outcomes in adulthood. However, it is not clear whether the link between teen relationships and lifetime health is causal(因果的)-it could be that other factors, such as different family backgrounds, might contribute to both relationship problems in adolescence and to poor health in adulthood. Also, most research has focused on teens' relationships with their peers(同龄人), rather than on their relationships with teachers.To explore those questions further, Kim analyzed data on nearly 20,000 participants from the Add Health study, a national study in theU.S.that followed participants from seventh grade into early adulthood. The participant pool included more than 3,400 pairs of siblings(兄弟姐妹). As teens, participants answered questions, like “How often have you had trouble getting along with other students and your teachers?" As adults, participants were asked about their physical and mental health.Kim found that participants who had reported better relationships with both their peers and teachers in middle and high school also reported better physical and mental health in their mid-20s. However, when he controlled for family background by looking at pairs of siblings together, only the link between good teacher relationships and adult health remained significant.The results suggest teacher relationships are more important than previously realized and that schools shouldinvest in training teachers on how to build warm and supportive relationships with their students. "This is not something that most teachers receive much training in," Kim said, “but it should be.”4. What does the underlined word “implications" in Paragraph 2 refer to?A. Recipes.B. Habits.C. Benefits.D. Risks.5. What is Paragraph 3 mainly about?A. Poor health in adolescence.B. Limitations of the previous research.C. Teens' relationships with their peers.D. Factors affecting health in adulthood.6. What does Kim's research show?A. Good adult health depends on teens' good teachers.B. Good family background promises long-term adult health.C. Healthy peer relationships leads to students' academic success.D. Positive student-teacher relationship helps students' adult health.7. Where does this text probably come from?A. A health magazine.B. A medical report.C. A term paper.D. A family survey.C“They’re harming your brain.” “They’re ruining your eyes.” “They’re turning you into a violent person.” The words said publicly against video games are so common, but are these worries founded on actual science? Countless studies have offered different opinions on whether video games are bad for you. We’ve rounded up the most notable reports and studies below, so you can weigh up the evidence for yourself.In 2013,psychologist(心理学家) Simone Kuhn studied the influences of spending long hours on video games on the brains of young adults and found that several areas became bigger than before. These areas are connected with highercognitive functions(认知功能), memory formation andfinemotor(精细运动) function.Last year, psychologists said that video game players who favour violent games are more likely to be violent when offline. Dr. Mark Appelbaum of the American Psychological Association said that there was a relation between violent video game use and increases in violent behaviour.Dr. Daphne Bavelier is an expert in the field of Brain & Cognitive Sciences. Bavelier presented the audience with a colour-word test, where non-gamers are easily puzzled by the test, and those who spend long periodsplaying on their computers are more likely to pass the test with flying colours.“Actually, those video game players have many other advantages in terms of attention,” said Bavelier, “and one part of attention which is also improved for the better is our ability to follow the movements of objects.”“So, in a sense, when we think about the influence of video games on the brain, it’s very similar to the influence of wine on the health. There are some very poor uses of wine. There are some very poor uses of video games. But when drunk in reasonable amounts, and at the right age, wine can be very good for health,” said Bavelier.8. What can be learned from Simone Kuhn’s study?A. Video games make you happier.B. Video games make your brain grow.C. Video games play a key role in memory.D. Video games teach you how to learn fast.9. What was Dr. Mark Appelbaum’s attitude towards video games?A. He was against them.B. He was hopeful of them.C.He was in favour of them.D. He was uncertain about them.10. Which of the following may Dr. Daphne Bavelier agree with?A. Video games fix attention problems.B. Video games make kids do well in exams.C. Video games encourage violent behaviour.D. Video games help increase colour knowledge.11. Why are the uses of wine mentioned in the last paragraph?A. To remind people to avoid video games.B. To show the disadvantages of video games.C. To help people learn more about video games.D.To ask people to make good use of video games.DAn anti-obesity program for Australian girls didn’t lead to any improvements in their diet, physical activities or body weight a year later, according to a new report.Findings from the school-based intervention (介入), which involved exercise sessions and nutrition workshops for lower-income girls, are the latest disappointment in a lot of research attempting tohead offadultobesity and the disease risks that come with it.Especially during the middle-and high-school years, girls’ physical activity reduces obviously, according to lead researcher David Lubans, from theUniversityofNewcastleinNew South Wales,Australia. He said, “In the future we need to make the programs more interesting and exciting and present information in a way that is meaningful to adolescent girl.”Lubans and his workmates conducted their study in 12 schools in low-income areas ofNew South Wales. At the start of the study, girls in both groups weighed an average of close to 130pounds, with about four in ten considered overweight. Over the next year, adolescents in the intervention group were given pedometers (计步器) to encourage walking and running and invited to nutrition workshops and regular exercise sessions during the schoolday and at lunchtime. Participation in some of those activities were less than ideal. For example, the girls went to only one-quarter of lunchtime exercise sessions, and less than one in ten completed at-home physical activity or nutrition challenges, the researchers reported. At the end of the year, girls in both groups had gained a similar amount of weight and there was no difference in their average body fat.Preventive medicine researcher Robert Klesges said that although some anti-obesity programs have helped adults lose weight, the teen population has always been a source of failure for researchers. “The common belief is: nothing works,” he said. “And we have got to get beyond that.”“We need to think outside the box,” said Klesges, who wasn’t involved in the new study. “That could include learning from what has worked in adult studies, such as giving meal replacement drinks or prepared foods to teens who have trouble making changes to their diet. Or, it could mean using a “step-care” method — rather than researchers or their doctor telling them to keep doing the same thing.” Klesges said.12. The underlined words “head off” in Paragraph 2 can best be replaced by “________”.A. damageB. defendC. preventD. affect13. The methods used in the program to stop obesity don’t include ________.A. walking and runningB. inviting them to nutrition workshopsC. joining exercise sessions regularlyD. giving meal replacement drinks14. The main reason for the failure of the anti-obesity program is probably that ________.A. the participants didn’t take an active part in itB. the program was not interesting and exciting to participantsC. the participants didn’t get extra nutrition or exercise helpD. the program didn’t pay attention to healthy exercise15. What can be inferred from the last paragraph?A. As researchers, it is important to have creative research methods.B. Researchers need to give meals or prepare foods to participants.C. Teen girls have no difficulty in making changes to their diet.D. Some ant-obesity programs have not helped adults lose weight.第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
重庆市第一中学2023届高三下学期3月月考地理(带答案)
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秘密★启用前【考试时间:3月11日11:00~12:15】2023年重庆一中高2023届3月月考地理试题卷注意事项:1.答卷前,考生务必将自己的姓名、准考证号码填写在答题卡上。
2.作答时,务必将答案写在答题卡上。
写在本试卷及草稿纸上无效。
3.考试结束后,将答题卡交回。
一、选择题:本大题共15小题,每小题3分,共45分。
在每小题给出的四个选项中,只有一个选项符合题目要求的。
2022年8月21日,北碚缙云山出现巨大山火。
下图示意1961~2022年重庆市气候资料,据此完成1~2题。
1.关于本次北碚山火蔓延的自然原因,下列说法不合理的是()A.树种多样B.气温较高C.降水偏少D.多山谷风2.据1961~2022年重庆市气候资料图,可知重庆8月份()A.气温和降水呈正相关B.气候符合雨热同期规律C.每隔20年左右有洪灾D.气温的升降具有连续性雅鲁藏布江流域是我国河谷风沙地貌发育典型的地区。
在该河流某河漫滩附近及两岸坡地上出现了数量众多、不同类型的流动沙丘。
科研人员发现甲地沙丘的物质来源于附近河漫滩,并顺风向在河谷两侧延伸;乙地沙丘的出露与黄土层破坏有关。
该地年均降水量514mm,主要集中在5~9月份,旱季风大。
当地人类活动强度较大,生活能源来自薪柴。
下图是甲、乙两地沙丘分布位置图。
据此完成3~5题。
3.推测形成甲地沙丘的时间和主要外力作用分别是()A.10~4月流水沉积B.10~4月风力沉积C.5~9月风力搬运D.5~9月冰川沉积4.下列因素与乙地沙丘出露关系最大的是()A.大风导致植被吹蚀B.地壳抬升使黄土层滑落C.人为导致植被缺失D.气候变化导致干旱加剧5.为防止甲、乙两地沙丘的进一步扩大,下列措施可行的是()①甲处设置挡沙墙②甲处禁止人类活动③乙处恢复植被④乙处重新覆盖黄土层A.①③B.①④C.②③D.②④英国南部某河流源于当地北部高地,流域内最高海拔514米,南部地势平坦,最低海拔26米,约84%的流域底层由不透水岩层构成,流域内大部分用地是农业牧草用地,只在源头处有占流域面积3%左右的荒野和沼泽。
2020届西南大学附属中学高三英语月考试题及答案解析
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2020届西南大学附属中学高三英语月考试题及答案解析第一部分阅读(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A、B、C、D四个选项中选出最佳选项AWashingtonDCBusToursDC Highlights TourThis is their base tour. It begins at 10 am daily and lasts for 5 hours. This part-bus, part-walking tour includes guided stops in theUS. All of their tours include a driver as well as a tour guide, and yourtour guide will get off the bus and give you walking tours of each stop, while your bus and driver wait for you. Capitol Building, the White House, Washington Monument as well as the Lincoln and MLK Memorials and the Vietnam War and Korean War Veterans Memorials.$54—Adult I $44—Child (3—12)Discover DC TourIf you want pretty much to explore every famous monument and landmark in DC and take a 1 -hour cruise on thePotomac River, then consider the Discover DC Tour. This 6-hour tour will take you to all locations (景点) listed on their DC Highlights Tour as well as the World WarⅡMemorial, the Franklin Delano Roosevelt Memorial, and the Thomas Jefferson Memorial.TIP: If you are planning on visiting NYC, you will get 30% off the Discover NYC Tour (normally $100) if you buy it at the same time as your Discover DC Tour.$74—Adult I $54—Child (3—12)VIP ExclusiveWashingtonDCCity TourThis 8-hour tour is actually the Discover DC Tour above with a VIP add-on at the beginning and the end. You * 11 meet your guide early for reserved (预留)tickets to tour inside the US Capitol Building. The 45 -minute tour and film have reserved tickets so you don't have to worry about it being sold out. After your day of sightseeing, you 'll be dropped off at the National Archives, again with reserved time tickets so you don't have to worry about waiting in line.$125 for Adults and ChildrenSkyview Changeable Bus TourOn this changeable mini bus, you get to experience a guided tour with panoramic views (全景)without theglare of a window in the photos! A guided bus tour takes you not only through all locations listed on the DC Highlights Tour, but also Old Town Alexandria andNationalHarbor.$69—Adult I $59—Child (3—12)Time: 9 am—4 pm1. What's special about the DC Highlights Tour?A. It uses mini buses.B. It has the fewest locations.C. It has the most tour guides.D. It provides reserved tickets.2. How much should a man pay if he buys the Discover DC Tour and the Discover NYC Tour at the same time?A. $128.B. $174.C. $104.D. $144.3. Which tour lasts the longest?A. DC Highlights Tour.B. Discover DC Tour.C. VIP ExclusiveWashingtonDCCity Tour.D. Skyview Changeable Bus Tour.BA satellite is about to demonstrate a new way of capturing space junk with magnets for the first time. With the frequency of space launches dramatically increasing in recent years, the potential for a disastrous collision above Earth is continually growing. Now, Japanese orbital clean-up company Astroscale is testing a potential solution.The firm's End-of-Life Services by Astroscale demonstration mission is scheduled to lift off on 20 March aboard a Russian Soyuz rocket. It consists of two spacecraft: a smal “client” satellite and a larger “servicer” satellite, or “chaser”. The smaller satellite is equipped with a magnetic (磁力的) plate which allows the chaser todock withit.The two stacked spacecraft will perform three tests once in orbit, each of which will involve the servicer satellite releasing and then recapturing the client satellite. The first test will be the simplest, with the client satellite drifting a short distance away and then being recaptured. In the second test, the servicer satellite will set the client satellite tumbling before catching up with it and matching its motion to grab it.Finally, if those two tests go well, the chaser will live up to its name by letting the client satellite float a few hundred metres away before finding it and attaching to it. All of these tests will be performed autonomously, with little to no human input once they are set in motion.“These kinds of demonstrations have never been done before in space - they are very different to, say, an astronaut controlling a robotic arm on the International Space Station,” says Jason Forshaw at AstroscaleUK.“Thisis more of an autonomous mission.” At the end of the tests, both spacecraft will burn up in Earth's atmosphere.If companies wanted to use this capability, they would have to attach a magnetic plate to their satellites so they could be captured later. Because of the growing space garbage problem, many countries now require firms to have a way to bring back their satellites once they run out of fuel or fail, so this could be a fairly simple likely plan, Forshaw says. Right now, each chaser can only nab one satellite, but Astroscale is working on a version that could drag three or four out of orbit at once.4. Which of the following can replace the underlined word "dock with" in Paragraph 2?A. Deal with.B. Keep up with.C. Join together.D. Crash.5. Why many countries now require firms to have a way to bring back their satellites?A. Because of the growing space waste problem.B. Because the frequency of space launches are dramatically increasing.C. Because they can earn large profits from it.D. Because Astroscale has found a new method of capturing the space garbage.6. What will Astroscale do to solve the space junk problem?A. An astronaut controls a robotic arm on the International Space to capture the “client” satellite.B. Through a magnetic plate remotely controlled by humans on the ground to catch the “client” satellite.C. Finding the "client "satellite and attaching to it with a magnetic plate automatically.D. Tumbling to match the motion of “client satellite the drag three or four satellites out of its orbit into atmosphere.7. What can we infer from the passage?A. People will bum the space junk up in Earth's atmosphere in the future.B. Japan andRussiawill conduct space debris cleanup experiment together.C. These kinds of demonstrations have never been done before.D. The demonstration mission will be divided into three phases.CAncient Dunhuang manuscripts housed abroad have been edited and published by the Institute for Overseas National Literature of Northwest Minzu University since 2006. Up till now, 9 manuscripts kept in the British Library and22 inthe National Library of France have been finished, the institute said on April 24, 2018.Tens of thousands of valuable ancient documents and cultural relics, discovered in the Mogao Grottos inDunhuang, Gansu province, were scattered overseas in the early 20th century. Dunhuang manuscripts currently in the British Library and the National Library of France are the most important ancient national documents housed abroad.Co-edited by Institute for Overseas National Literature of Northwest Minzu University, Shanghai Classics Publishing House, the British Library and the National Library of France, these Dunhuang manuscripts return home in publication form for the first time. The institute is also preparing an online database of the manuscripts.According to Cai Rang, associate director of the institute, Dunhuang manuscripts scattered overseas in Russia, Britain, France and Japan have rich contents, including Buddhism law, social contract, history,linguisticsand art. The institute has edited and published 31 manuscripts over the past 13 years, but the work has not been finished. It plans to publish 15 from the British Library and over 30 from the National Library of France all together. In addition, it will also publish manuscripts collected by other countries.“Some manuscripts are hard to read because of the indecipherable words. So we read carefully and understand them by comparing with Buddhism documents handed down from ancient times,” Cai said. “Next, document classification and compilation will be our key work for further research.”The work done by the institute is helpful to study the history and culture of Tubo(present-day Tibet) during the period of 8th to 11th century and the history of national cultural exchanges at that time.8. When did so many valuable ancient documents, discovered in the Mogao Grottos, were scattered overseas?A. In the late 19th century.B. In the middle of the 19th century.C. At the beginning of the 19th century.D. At the beginning of the 20th century.9. How do the members of the institute understand some manuscripts that are hard to read?A. By using modern technology.B. By asking other famous experts.C. By comparing them with Buddhism documents.D. By studying the history and culture of Tubo.10. The possible meaning of the underlined word “linguistics” in paragraph 4 is “______”.A. the scientific study of languageB. the opinion that people have about someone or somethingC. something that people may have as part of their characterD. a system or method for carrying passengers or goods from one place to another11. What is the theme of the news report?A. Dunhuang manuscripts scattered overseas have rich contents.B. China publishes Dunhuang manuscripts housed overseas.C. High value of ancient documents and cultural relics in Mogao Grottos.D. Prepare an online database of Dunhuang manuscripts housed overseas.DOver the years, NASA has successfully sent several rovers (飞行器) to Mars. While the science laboratories continue to provide important information on the Red Planet, they keep the space exploration rovers staying closeto the original landing place.To get a more comprehensive (详尽的) view of Mars, the US Space Agency plans to make a small test helicopter with the Mars 2020 Rover, which will be sent off in July 2020.The football-sized “marscopter” weighs about four pounds.It can fly at about ten times the speed of helicopters on Earth. The light weight and fast speed are important for the helicopter to be able to fly in the thin Mars atmosphere, which is about just one percent of that of Earth. “To make it fly in that thin Mars atmosphere, we had to make everything ready, and make it as light as possible while being as strong and powerful as it can possibly be. “Mimi Aung, Mars helicopter project manager, said in a meeting.Upon landing on the Red Planet, the Mars 2020 Rover will find a proper location to send of the helicopter. The helicopter will start with a short climb, no higher than 10 feet, and hover (盘旋) for just 30 seconds before landing back on the Mars surface. If all goes well, five more flights of longer distances, for 90 seconds each, will be conducted over the next 30 days. The short journeys will be recorded by a small camera and sent back to the scientists on Earth.If the plan goes on well, the first helicopter to fly in another world, will open up a whole new way to explore Mars. The Mars helicopter's first flight will be a great invention. For those of us whose research is about flight, that would be a wonderful, historic moment.12. To fly in thin Mars atmosphere,we should make the helicopter_______.A. strong and heavyB. heavy and fastC. light and fastD. strong and slow13. How many times will the helicopter fly?A. Three timesB. Four timesC. Five timesD. Six times14. What can we learn from the last paragraph?A. It’s interesting to fly in another world.B. I' s important to fly in another world.C. The plan to fly the helicopter goes on well.D. The helicopters first flight is successful.15. What may be the best title for the passage?A. To send a helicopter to Mars in 2020B. To send a rover to Mars in 2020C. To live in the thin Mars atmosphereD. To send back records to scientists第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
2020届长郡中学高三第3次月考试卷-英语试卷及答案
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重庆市第一中学2021届高三英语模拟试卷分类汇编:读后续写专题
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重庆市第一中学2021届高三英语模拟试卷分类汇编读后续写专题重庆市第一中学2021届高三下学期第三次月考英语试卷第二节(满分 25 分)阅读下面材料, 根据其内容和所给段落开头语续写两段, 使之构成一篇完整的短文。
Niesha could not forget the way she had frozen in front of the class today.Mr. Roberts had divided the class into groups to do presentations. Today had been Niesha’s turn. However, her hands had shaken so badly that she couldn’t read her notes. Her voice had become softer even to silence. Mr. Roberts had kindly ended Niesha’s part of the presentation even though she had clearly not finished. He had also asked Niesha to stay after class for a moment.“Niesha, I know you’re shy, but you worked hard on this project. I’d hate to see you give up on yourself.” Mr. Roberts had hesitated,“If I give you until tomorrow, do you think you can find your co urage?”Niesha had nodded, grateful for the chance. She had gone as quickly as she could to her next class. She had kept her head down and hoped the school day would end soon.When she reached her back steps that afternoon, she could see an inviting light coming from the kitchen windows. Momma was baking. Momma studied Niesha’s face as she came into the kitchen. “What’s wrong, Niesha?”Tears shone in Niesha’s brown eyes. She told her the whole story. Momma was silent for a moment, her hands still busy with t he cake. “Why is it that you can talk to me about anything and everything, but you can’t talk to your class?” Momma asked. She set the timer and then said, “Let me show you something.”Niesha followed Momma to her bedroom. There Momma showed her a book filled with newspaper clippings and pictures. In it there was a blue ribbon(丝带)that said “First Place” and a picture of herself when she was very young, standing with her parents.“I won it for public speaking. I started the school year as the shyest girl on the speech team, but I ended the year as the blue ribbon winner. It wasn’t easy at first—not sure of myself at all. I worked hard, and mostly I faced my fears. You just need to find your courage.”注意:1.续写词数应为150 左右:2.请按如下格式在答题卡的相应位置作答。
重庆市直属校重庆市第八中学等2020┄2021届高三3月月考试题英语 无答案
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第一部分听力(共两节,满分30 分)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。
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.Why did the woman go to Beijing?A.To visit friends.B. To go sightseeing.C. To take a business trip.2.Where does the conversation take place?A.At home.B. At a bookstore.C. At a restaurant.3.What is the woman related to Henry?A.His classmate.B. His co-worker.C. His sister.4.What will the woman do next?A.Prepare a meal.B. Pick up Jim.C. Play with her kids.5.What programme does the girl want to watch?A.An Indian film.B. A dance competition.C. A history programme.第二节(共15 小题;每小题1. 5 分, 满分22. 5 分)听下面5 段对话或独白。
每段对话或独白后有几个小题, 从题中所给的A、B、C 三个选项中选出最佳选项。
听每段对话或独白前, 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。
每段对话或独白读两遍。
听第 6 段材料, 回答第6、7 题。
6.What do the speakers decide to do today?A.Watch a movie.B. Go to a park.C. Rest at home.7.Why does the man want to call Tim?A.To invite him to join them.B.To seek some suggestions.C.To ask about his eyes.听第 7 段材料, 回答第8、9 题。
重庆市凤鸣山中学2020届高三上学期第一次月考英语试卷
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英语试题注意事项:1.答卷前,考生务必将自己的姓名、准考证号填写在答题卡和试卷指定位置上。
2.回答选择题时,选出每小题答案后,用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。
回答非选择题时,将答案写在答题卡上,写在本试卷上无效。
3.考试结束后,将本试卷和答题卡一并交回。
第一部分听力(共两节,满分30分)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。
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.What does the woman mean?A.The man can also get birthday presents.B. Jack is looking forward to his birthday.C.She will buy a new T-shirt for Jack.2. When will the two speakers probably arrive at the airport?A.At 2:30B.At 3:30C.At 4:303. How does the woman feel now?A. Stressed.B. Shocked.C.Exhausted.4. What did the man do?A. He moved to a new place.B. He took a good trip.C. He sold some souvenirs.5. What’s the relationship between the woman and Ted?A. Colleagues.B. Cousins.C. Classmates.第二节(共15小题,每小题1.5分,满分22.5分)听第6段材料,回答第6、7题。
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秘密★启用前【考试时间:3月29日15:00—17:00】2020年重庆一中高2020级高三下期3月月考英语试题卷2020.3.29英语试题卷共9页。
满分150分。
考试时间120分钟。
注意事项:1.答题前,务必将自己的姓名、准考证号填写在答题卡规定的位置上。
2.答选择题时,必须使用2B铅笔将答题卡上对应题目的答案标号涂黑,如需改动,用橡皮擦擦干净后,再选涂其他答案标号。
3.答非选择题时,必须使用0.5毫米黑色签字笔,将答案书写在答题卡规定的位置上。
4.所有题目必须在答题卡上作答,在试题卷上答题无效。
第Ⅰ卷Ⅰ.听力部分(共二节,每小题1分,满分20分)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。
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.What will the man do in the job interview?A.Keep smiling.B.Take notes.C.Speak loudly.2.What is the probable relationship between the speakers?A.Teacher and student.B.Doctor and patient.C.Husband and wife.3.What does the woman advise the man to do?A.Never complain about failure.B.Never care about exam results.C.Keep on trying hard.4.Why is the baby crying?A.He wishes to stay with his parents.B.He desires to drink milk.C.He wants to sleep.5.How much should a couple with two children pay for the tickets?A.15dollars.B.30dollars.C.60dollars.第二节(共15小题;每小题1.5分,满分22.5分)听下面5段对话或独白。
每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项。
听每段对话或独白前,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。
每段对话或独白读两遍。
听第6段材料,回答第6、7题。
6.When will the speakers meet?A.At7:00tonight.B.At7:00pm on Friday.C.At7:30pm tomorrow.7.What are the speakers talking about?A.Eating together.B.Attending a concert.C.Making a cake.听第7段材料,回答第8至10题。
8.What does the woman want to do?A.Live a slow life.B.Get herself occupied.C.Make herself promoted.9.How does the woman feel at the moment?A.Upset.B.Puzzled.C.Bored.10.What does the man advise the woman to do?A.Enjoy the free time.B.Give him a hand.C.Work hard.听第8段材料,回答第11至13题。
11.What was the man doing last night?A.Buying clothes.B.Watching a movie.C.Reading newspapers.12.What did the critic think of the film?A.It was worth seeing ten times.B.It deserved the award it had won.C.It was one of the best films in a decade.13.What can we learn from the conversation?A.The man will see the film tonight.B.The woman shares the critic’s view.C.The film will be the best of the year.听第9段材料,回答第14至17题。
14.What does the woman think of the jacket?A.It is cheap and fine.B.It is not expensive or cheap.C.It is cool and expensive.15.What is the game rule according to the woman?A.Shooting for an item.B.Shooting for more points.C.Shooting to choose your favourite.16.What made the woman disappointed?A.Gaining nothing.B.Wasting too much money.C.Failing to get what she desired.17.What did the woman think was good?A.The sales skills.B.Her playing skills.C.The shooting outcome.听第10段材料,回答第18至20题。
18.Which is NOT mentioned in the text?A.Racial diversity.B.Varied religions.C.Civil wars.19.What is typical of American life?plex.B.Mobile.fortable.20.What has influenced American society according to the text?A.Its laws.B.Its history.C.Its location.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。
ADIFFERENT PACKS,SAME GREAT QUALITYTownsville,Australia’s largest farming families,enjoyed the most exceptional pasture in Australia.The people at Townsville blend dairy goodness and clever ideas to bring you great tasting innovative products,which have been shipped to America, Canada and exported to Austria.Like our lightest one—instant skim(脱脂的)milk powder that makes10litres of delicious skim milk.So you never run out of milk again.DIRECTIONS FOR USE:TO MIX1CUP(250ML)•Add1/4cup(25g)of instant Townsville Skim Milk Powder to1/2cup of hot or cold water.•Add more water to make up1cup.•For best result always add powder to water.•For richer taste and extra nutrition,use additional powder to suit your personal taste or preference.•To improve the natural taste of this product,we recommend storing the liquid milk in the refrigerator overnight before consumption.NOTICE:•Store powder in a cool,dry place.•Keep refrigerated at or below4degrees centigrade no more than3days.•Once opened,store in an airtight container.21.In which country is Townsville—a world-famous dairy product brand made?A.Australia.B.Austria.C.Canada.D.America.22.What should a user do if he/she wants the milk to taste a natural taste?A.Add some sugar to the milk.B.Remove the cream from the milk.C.Put it in the fridge before using it.D.Increase its amount in the liquid milk.23.Where are you suggested putting the powder once it is opened?A.In a plastic bowl.B.In a warm room.C.In a watertight jar.D.In a closed container.BOld Mrs.Lynn was working in the cottage,hanging the washed clothes on the line.What she wasn’t aware was that some children were hiding in a nearby tree watching her every move.They were sure that she was a witch and wanted to find the evidence.They watched nervously as she took a broomstick to sweep the dirt from her stone steps.But much to their disappointment,she didn’t get on the broomstick and fly off.The old lady only looked up when her hen began to make sounds loudly—signaling that she had laid an egg in the nest on the top of the haystack.(干草堆).The old lady put aside her broomstick and walked to the haystack,followed by Michael,a black cat she had rescued from a fox trap.With only three legs,it was hard for Michael to keep up with his mistress.The cat was proof for the children that only a witch would own a black cat with three legs!Accidentally,she tripped and crashed to the ground.The children were in horror.“Should we go and help her?”asked Mia.“What if it’s a trick?”replied Patrick.“She probably knows we’re here.Witches know things like that!”After thinking for a while,Julia said,“Anyway,we should go and check whether she is all right.”Approaching prudently,they could see a wound on the old lady’s forehead.She had knocked her head on a stone and was unconscious.“Go and get Dad,”Mia yelled to her brothers.“Tell him about the accident.”Later,in the hospital,the old lady smiled her thanks.“I was so lucky that you lovely children happened to be passing when I fell.I must have yelled quite loudly.”The children exchanged guilty glances,but were very pleased that she was not a witch after all!24.Mrs.Lynn stopped sweeping when_______.A.her doorstep became very cleanB.she heard the hen making sounds loudlyC.she noticed the children in the treeD.her cat Michael managed to get her attention25.Why was Patrick not willing to help Mrs.Lynn when she fell?A.He thought that she could be cheating them.B.He was afraid of the three-legged black cat.C.He did not think that she was hurt in the fall.D.He knew he and the others shouldn’t have been in her tree.26.Which of the definitions is closest in meaning to the underlined word“prudently”?A.Slowly.B.Hurriedly.C.Carefully.D.Quietly.27.What is the main idea of the story?A.Constant dropping wears away a stone.B.Never judge a book by its cover.C.A friend in need is a friend indeed.D.A good medicine tastes bitter.CUN Humanitarian Chief Mark Lowcock today released US$15million from the Central Emergency Response Fund(CERF)to help fund global efforts to contain the COVID-19virus.The announcement came as the World Health Organization(WHO)upgraded the global risk of the coronavirus outbreak to“very high”–its top level of risk assessment.The WHO has said there is still a chance of containing the virus if its chain of transmission is broken.The UN funding has been released to the WHO and the United Nations Children’s Fund(UNICEF).It will fund essential activities including being aware of the spread of the virus,investigating cases,and putting national laboratories into use.The WHO has called for US$675million to fund the fight against coronavirus. There is a window of opportunity to contain the spread of the virus if countries take strong measures to detect cases early,isolate and care for patients,and trace contacts.Emergency Relief Coordinator and Under-Secretary-General for Humanitarian Affairs,Mark Lowcock said,“We do not yet see evidence that the virus is spreading freely.As long as that’s the case,we still have a chance of containing it,by strengthening surveillance,conducting thorough outbreak investigations to identify contacts and applying appropriate measures to prevent further spread.”“This announcement from the UN’s Emergency Fund will help countries with fragile health systems improve their detection and response operations.It has the potential to save the lives of millions of vulnerable people.”Tedros Adhanom Ghebreyesus,WHO Director-General,said,“The potential spread of the virus to countries with weaker health systems is one of our biggest concerns.These funds will help support these countries get ready for detecting and isolating cases,protecting their health workers,and treating patients with dignity and appropriate care.This will help us save lives and push back the virus.”“At this critical moment,every effort must be made to push back against the outbreak,”said UNICEF Executive Director Henrietta Fore.“These funds will support our global efforts to promote weaker health systems and inform children, pregnant women and families about how to protect themselves.”28.We can learn from the passage that__________.A.WHO referred to the COVID-19as the medium level of risk assessmentB.The virus is still hard to contain even if timely measures are takenC.The fund will help people with weak healthD.The fund released by UN is much less than WHO originally demanded29.According to the passage,the fund can be used in the following aspectsexcept________.A.The examination of the people concernedB.The monitor of the the spread of the virusC.The operation of the national laboratoriesD.The establishment of the mobile hospital30.What is Tedros Adhanom Ghebreyesus’attitude toward the fight against the virus?A.Optimistic.B.Skeptical.C.Cautious.D.Ambiguous.31.In which part of newspaper can you most probably read the passage?A.Travel.B.Health.C.Business.D.Lifestyle.DE-cigarettes lead to as many lung diseases as tobacco products,a new study has found.The report from the University of North Carolina at Chapel Hill compared saliva(唾液)samples from tobacco smokers,e-cigarette smokers and nonsmokers. Researchers found that e-cigarette smokers were likely to develop dangerous proteins associated with lung diseases.The study adds to a growing body of evidence proving that e-cigarettes might not be the perfect alternative smokers addicted to tobacco are looking for.Last year a Surgeon General’s report claimed that the use of e-cigarettes among a certain group of people jumped900percent from2011to2015and more studies were carried out to research their side effects.That same year,the FDA put e-cigarettes in the tobacco products the administration monitors.Previous research from UCLA has proven that e-cigarettes can cause lifelong damage to one’s heart,and that one puff(吸一口烟)of an e-cigarette is all it takes to increase one’s risk of having a heart attack.For the new study UNC researchers observed15e-cigarette users,14cigarette smokers and15nonsmokers.The study revealed that e-cigarette smokers have raised levels of NET-related proteins in their airways,the increased levels of which can lead to lung illnesses,making it difficult for patients to breathe.Study author Dr Mehmet Keismer said,“There is confusion about whether e-cigarettes are‘safer’than cigarettes because the potential adverse effects of e-cigarettes are only beginning to be studied.Our results suggest that e-cigarettes might be just as bad as cigarettes.”Dr Keismer also stressed that e-cigarettes come with their own harmful risks along with those linked to tobacco,which challenges the concept that switching from cigarettes to e-cigarettes is a healthier alternative.A citizen named Dyclna said,“The e-cigarettes probably make you cough less, but nobody gives a warning about your lungs.For producers,it’s just a money thing —it’s just about getting profits from it.The problem is that our government just stands there with its hands behind the back.”32.Why did the FDA list e-cigarettes into monitored products?A.It might realize the harm of them.B.It wanted to improve their quality.C.It aimed to reduce their illegal sales.D.It might be warned by the government.33.What harm does the increased level of NET do to people?A.Leading to weight gain.B.Spoiling people’s appetite.C.Making breathing hard.D.Speeding people’s heartbeat.34.What does Dyclna mainly want to express?A.E-cigarettes are safer than regular ones.B.E-cigarettes can only benefit few people.C.Producers make a high profit from e-cigarettes.ernments are to blame for e-cigarettes’consumption.35.What is the best title for the text?A.E-cigarettes:A new way of smoking.B.E-cigarettes:A better way than tobacco?C.E-cigarettes:The harmful proteins it produces.D.E-cigarettes:The urgent need of government control.第二节(共5小题;每小题2分,满分10分)In our fast world of phones,fax machines and computers,the old-fashioned art of letter writing is at risk of disappearing altogether.36There is the excitement of its arrival,the pleasure of seeing who it is from and,finally,the enjoyment of the contents.Letter writing has been part of my life for as long as I can remember.It probably began with the little notes I would write to my mother.My mother,also,always insisted I write my own thank-you letters for Christmas and birthday presents.37.When I left home at18to train as a doctor in London,I would write once a week, and so would my mother.Occasionally my father would write and it was always a joy to receive his long,amusing letters.38Of course,we also made phone calls but it is the letters that I remember most.There were also letters from my boyfriend.In our youth he had to work or study away at some time and we were only able to stay in touch by letter.39I found that I could often express myself more easily in writing than by talking.I love the letters that come with birthday or Christmas cards.Notes are appreciated,but how much better to have a year’s supply of news!And it’s better still when it’s an airmail envelope with beautiful stamps.40Like my mother before me,I insist they write their own thank-you letters. My daughter writes to me little letters,just as I did to my mother.I strongly urge readers not to allow letter writing to become another“lost art”.A.Poor handwriting can spoil(破坏)your enjoyment of a letter.B.I am pleased that my children are carrying on the tradition.C.We had been writing to each other for a long time but never met.D.It didn’t matter how short or untidy they were as long as they were letters.E.But instead of harming the relationship,letter writing seemed to improve them.F.Yet,to me,receiving a letter cannot be matched by any form of communication.G.The letters from him contained just everyday events concerning my parents and their friends.第三部分英语知识运用(共三节,满分70分)第一节完形填空(共20小题;每小题1.5分,满分30分)阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。