广东省东莞市万江中学,石龙中学,常平中学三校联考2023-2024学年高二上学期11月期中英语试题

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2023-2024学年广东省东莞市万江中学 石龙中学等学校高一上学期三校联考化学试题

2023-2024学年广东省东莞市万江中学 石龙中学等学校高一上学期三校联考化学试题

2023-2024学年广东省东莞市万江中学石龙中学等学校高一上学期三校联考化学试题1.人们的幸福生活是靠辛勤劳动创造出来的。

下列化学知识解读错误的是2.澳大利亚科学家发现了纯碳新材料“碳纳米泡沫”,每个泡沫含有约4000个碳原子,直径约6-9 nm,在低于-183℃时,泡沫具有永久磁性。

下列说法正确的是A.“碳纳米泡沫”是一种新型的化合物B.“碳纳米泡沫”与石墨互为同素异形体C.石墨转化为“碳纳米泡沫”的反应是氧化还原反应D.用激光笔照射“碳纳米泡沫”,光线通过时出现明亮的光路3.依据下列相关实验,所得结论正确的是实验装置或观图实铜丝可以导干燥的氯化钠不导电,NaCl在水中的电熔融的NaCl能导4.对下列物质进行的分类正确的是A.酸性氧化物都是非金属氧化物B.CuSO 4 ·5H 2 O属于纯净物C.凡能电离出H +的化合物均属于酸D.盐类物质一定含有金属阳离子5.下列化学用语正确的是A.碳酸氢钠在水中的电离方程式:NaHCO 3 =Na + +H + +B.氯气和石灰乳反应制备漂白粉的离子方程式:C.钠与水反应的化学方程式:2Na+2H 2 O=2NaOH+H 2↑D.氯气与水反应的离子方程式:6.菜谱中记载:河虾不宜与西红柿同食。

主要原因是河虾中含有+5价砷,西红柿中含有比较多的维生素C,两者同食时会生成有毒的+3价砷。

下列说法不正确的是A.维生素C具有还原性B.上述过程中砷元素发生还原反应C.上述过程中+5价砷类物质作氧化剂D.上述过程中+3价砷类化合物是氧化产物7.下列各组离子一定能大量共存的是A.在透明溶液中:Na +、Cu 2+、Cl -、B.在含大量Ba 2+的溶液中:Na +、K +、、OH -C.在强碱溶液中:Na +、K +、、D.滴加紫色石蕊溶液显红色的溶液中:K +、Na +、Cl -、8.下列物质间的转化中,不能一步实现的是A.Na 2O→NaOH→NaClO B.Cl 2→HClO→CO 2C.Na 2 CO 3→NaHCO 3→NaCl D.Na→Na 2 O 2→NaOH9.钠和氯及其化合物与生活、生产密切相关,下列说法不正确的是A.小苏打可用于治疗胃酸过多B.氯气可以使鲜花褪色C.工业上可以利用H 2和Cl 2直接化合制成HCl,若HCl发生泄漏,车间里将会弥漫白烟D.钠着火时不可用泡沫灭火器灭火,应用干燥的沙土来灭火10.下列装置完成相关实验,合理的是排空气收集法制备氢氧化铁胶除去粗盐水中的比较Na CO 和NaHCO 热11.某课外小组为了鉴别和两种白色固体,设计了如下几种实验方法。

2023-2024学年广东省东莞市万江中学高二上学期第二次月考(1月)数学试题

2023-2024学年广东省东莞市万江中学高二上学期第二次月考(1月)数学试题

2023-2024学年广东省东莞市万江中学高二上学期第二次月考(1月)数学试题1.已知数列是公比为2的等比数列,且,则等于()A.24B.48C.72D.962.与直线垂直的一个向量是()A.B.C.D.3.已知双曲线E:的一条渐近线方程为,则双曲线的焦距为()A.4B.6C.D.134.已知等差数列的前项和为,若与方程的两个实根,则()A.46B.44C.42D.405.已知空间四边形ABCO中,,,,M为OA中点,点N在BC上,且,则等于()A.B.C.D.6.已知数列满足,,则数列的通项公式是()A.B.C.D.7.已知直线与圆相交于,两点,则的面积为()A.2B.C.D.与有关的不确定值8.已知椭圆C:的左、右焦点分别为、,若椭圆C上存在一点P,使得△PF1F2的内切圆的半径为,则椭圆C的离心率的取值范围是()A.B.C.D.9.设等差数列的前n项和为,且,,则下列结论正确的有()A.B.C.数列单调递减D.对任意,有10.若方程所表示的曲线为,则下面四个命题中正确的是()A.若为椭圆,则B.若为双曲线,则或C.曲线可能是圆D.若为椭圆,且长轴在轴上,则11.已知空间三点,设.则下列结论正确的是()A.若,且,则B.和的夹角的余弦值C.若与互相垂直,则的值为2;D.若与轴垂直,则,应满足12.如果一个人爬楼梯的方式只有两种,一次上一级台阶或一次上两级台阶,设爬上级台阶的方法数为,则下列结论正确的有()A.B.C.D.13.若直线与直线平行,则______.14.已知圆与圆内切,则______.15.设等差数列的前n项和为,且,,则______.16.如图,在三棱柱ABC-A1B1C1中,所有棱长均为1,且AA1⊥底面ABC,则点B1到平面ABC1的距离为______.17.已知抛物线过点,焦点为F.(1)求抛物线C的方程;(2)求过点P且与抛物线C有且仅有一个公共点的直线l的方程.18.已知数列是正项等比数列,数列满足.(1)证明:数列是等差数列;(2)若,,设数列和中的所有项按从小到大的顺序排列构成数列,记数列的前项和为,求19.已知数列的前n项和为,且满足.(1)求的通项公式;(2)设,求数列的前20项和.(化简后的结果可保留指数形式)20.已知等差数列和正项等比数列满足:,,.(1)求数列的通项公式;(2)记,数列的前项和为,求.21.已知三棱锥(如图一)的平面展开图(如图二)中,四边形为边长等于的正方形,和均为正三角形,在三棱锥中:(1)证明:平面平面;(2)若点M在棱上运动,当直线与平面所成的角最大时,求平面与平面所成锐二面角的余弦值.22.已知椭圆的短轴长为2,点在椭圆上,与两焦点围成的三角形面积的最大值为.(1)求椭圆的标准方程;(2)当为椭圆的右顶点时,直线与椭圆相交于两点(异于点),且.试判断直线是否过定点?如果过定点,求出该定点的坐标;如果不过定点,请说明理由.。

广东东莞一中、东莞实验中学等三校2024年高二下学期联考化学试题+答案

广东东莞一中、东莞实验中学等三校2024年高二下学期联考化学试题+答案

2023~2024学年第二学期三校联考高二化学可能用到的相对原子质量: H-1 C-12 N-14 O-16 Cl-35.5 Fe-56 Cu-64一、选择题:本题包括16小题,共44分。

其中1~10小题,每小题2分,共20分。

11~16小题,每小题4分,共24分。

每小题只有一个选项符合题意。

1. 化学知识广泛应用于生产、生活中。

下列叙述不正确的是()A. 明矾和ClO2均可用作净水剂,且净水原理相同B. 《石灰吟》中“烈火焚烧若等闲”描述的是热能转变为化学能C. 轮船的船壳水线以下常装有一些锌块,这是利用了牺牲阳极法D. 用饱和氯化铵溶液可以清洗钢铁表面的锈迹2.下列方程式与所给事实不相符的是()A.NaHS的水解反应:HS-+H20 H3O++S2-B.用FeCl3溶液腐蚀印刷线路板上的Cu:2Fe3++Cu=2Fe2++Cu2+C.NaHCO3在水溶液中的电离方程式:NaHCO3 =Na++HCO3—D.用明矾作净水剂:Al3++3H2O Al(OH)3(胶体)+3H+3. 下列描述与盐类水解无关..的是()A. 用纯碱溶液清洗油污B. 1 mol·L-1的醋酸加水稀释,溶液的pH增大,导电能力减弱C. 铵态氮肥NH4HCO3与钾肥K2CO3混施可能会降低肥效D. 用FeCl3晶体配制溶液时,先将其溶于较浓盐酸中4.关于如图所示① ②两个装置的叙述正确的是()A.硫酸浓度变化:①不变,②减小B.① 中电解池的电子流动方向:负极→C电极(左边)→溶液→C电极(右边)→阳极C.电极反应式:① 中阳极:4OH--4e-=2H2O+O2↑,②中正极:Zn-2e-=Zn2+D.离子移动方向:① 中H+向阴极方向移动,②中H+向正极方向移动5.下列变化与勒夏特列原理无关的是()A.红棕色的NO2体系加压后,颜色先变深后逐渐变浅B.将0.01mol/LFeCl3溶液加热,溶液的颜色加深C.在配制硫酸亚铁溶液时往往要加入少量铁粉D.加热蒸干AlCl3溶液不能得到无水AlCl36.在恒容密闭容器中发生下列化学反应:4NH3(g)+6NO(g) 5N2(g)+6H2O(l) ΔH<0下列有关说法正确的是()A. 其他条件不变,使用高效催化剂,废气中氮氧化物的转化率增大B. 平衡时,其他条件不变,增加NH3的浓度,废气中NO的转化率减小C. 单位时间内生成NH3和H2O的物质的量之比为2∶3时,反应达到平衡D. 平衡时,其他条件不变,升高温度可使该反应的平衡常数增大7.金属钯的一种离子[PdCl4]2-可催化合成H2O2,反应过程如图所示。

广东省东莞市两所中学2023-2024学年高二上学期11月联考语文试题(含答案)

广东省东莞市两所中学2023-2024学年高二上学期11月联考语文试题(含答案)

东莞市两所中学2023-2024学年高二上学期11月联考语文试题一、现代文阅读(35分)(一)现代文阅读Ⅰ(本题共5小题,19分)阅读下面的文字,完成下面1~5题。

材料一:民族共同体意识植根于中华文化的沃土,有深厚的历史渊源和历史底蕴,体现了中华民族理想的价值诉求,回应了中华民族“如何能在一起”的时代追问。

基于相同的思想认知、相通的价值观念,在迎接中华民族伟大复兴的新时代,我们尤其要大力弘扬中华传统文化中的民族共同体意识。

协同协作、协和万邦,是中华民族共同体的坚实基础。

中国本身就是一种文明的存在,中华民族形成的历史就是民族共同体意识不断积淀、逐渐生成的历史。

在这个过程中,协同意识、协作观念发挥了巨大作用。

在遥远的五帝时代,中国人就已经提出了明确的“协和万邦”观念。

《尚书·尧典》说:“克明俊德,以亲九族。

九族既睦,平章百姓。

百姓昭明,协和万邦。

”协和,意味着协同与公平公正,意味着人民和睦相处,各邦友好往来。

亲九族、和万邦,不仅要把家族、宗族治理好,还要把国家治理好,使各邦团结起来。

各民族在长期的交流交往和融合发展中,逐渐形成了共同的文化心理,例如恤孤、济困、扶危等。

尊王攘夷、崇尚一统,是中华民族共同体的基本内涵。

中华民族紧密团结,是因为有强大的向心力、凝聚力。

向心力来自共同遵循的“道”,“道”就是王道,就是尊王攘夷;凝聚力来自内心的“统”,这个“统”就是正统,就是崇尚一统。

从孔子作《春秋》开始,“大一统”的观念就日渐深入人心。

“大一统”的表述最早见于《公羊传·隐公元年》,其中解释《春秋》所言“王正月”说:“何言乎王正月?大一统也。

”徐彦疏:“王者受命,制正月一统天下,令万物无不一一皆奉之以为始,故言大一统也。

”所谓“大一统”就是以一统为大,其中的“大”是重视、尊重。

“大一统”就是“尊王”,就是尊王道、抑霸道,就是天下诸侯皆统系于王。

“大一统”不是强调所统辖疆域的辽阔,而是指国家政治、经济制度与思想文化上的集中。

2023-2024学年广东省东莞市万江中学高二(下)三校联考物理试卷+答案解析

2023-2024学年广东省东莞市万江中学高二(下)三校联考物理试卷+答案解析

2023-2024学年广东省东莞市万江中学高二(下)三校联考物理试卷一、单选题:本大题共7小题,共28分。

1.万江中学校园设置了人脸识别测温终端,如图所示,它具有“人脸比对+体温检测”两种功能。

其中,测温原理是()A.电流的热效应B.无线电波传输信号C.红外线的热效应D.电磁感应2.“西电东输”是我国实现经济跨地区可持续快速发展的重要保证。

在输送功率一定的情况下,将输电电压提高为原来的3倍,则输电导线上的电能损失将减小为原来的()A. B. C. D.3.如图所示,一带电液滴在相互垂直的匀强电场和匀强磁场中刚好做匀速圆周运动,其轨道半径为R,已知电场的电场强度为E,方向竖直向下;磁场的磁感应强度为B,方向垂直纸面向里,不计空气阻力,设重力加速度为g,则下列说法正确的是()A.液滴带正电B.液滴所受合外力为零C.液滴受到重力、电场力、洛伦兹力、向心力作用D.液滴运动的速度4.如图所示,把一根柔软的弹簧悬挂起来,使它的下端刚好和槽中的导电液接触,按图示连接电路,通电后,会看到弹簧上下跳动,关于这个现象,下列说法正确的()A.弹簧上下跳动的原因是通电后弹簧受到电场力B.将电源的正、负极对调一下,弹簧的跳动现象将消失C.将滑动变阻器的滑片向右移动时,弹簧将跳动得更加明显D.若换一劲度系数更小的弹簧,保持其他因素不变,则弹簧将跳动得更加明显5.某种感温式火灾报警器如图1所示,其简化的工作电路如图2所示。

变压器原线圈接电压有效值恒定的交流电源。

副线圈连接报警系统,其中为热敏电阻,其阻值随温度的升高而减小,为滑动变阻器,为定值电阻。

当警戒范围内发生火灾,环境温度升高达到预设值时,报警装置图中未画出通过检测的电流触发报警。

下列说法正确的是()A.警戒范围内出现火情时,副线圈两端电压减小B.警戒范围内出现火情时,原线圈输入功率变小C.通过定值电阻的电流过高时,报警装置就会报警D.若要调低预设的报警温度,可增大滑动变阻器的阻值6.如图甲所示,一条南北走向的小路,路口设有出入道闸,每侧道闸金属杆长L,当有车辆通过时杆会从水平位置以角速度匀速转动直到竖起。

广东省东莞市石龙中学等三校2024-2025学年高一上学期期中考试数学试卷

广东省东莞市石龙中学等三校2024-2025学年高一上学期期中考试数学试卷

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广东省东莞市石龙中学等三校2024-2025学年高一上学期期中考试数学试卷

广东省东莞市石龙中学等三校2024-2025学年高一上学期期中考试数学试卷

广东省东莞市石龙中学等三校2024-2025学年高一上学期期中考试数学试卷一、单选题1.已知集合{}*|12,N M x x x =-<∈,{}1,0,1,2,3N =-,则M N = ()A .{}0,1,2B .{}1,2C .{}1,0,1,2-D .{}2,32.“a b >”是“22ac bc >”的()A .充分不必要条件B .必要不充分条件C .充要条件D .既不充分也不必要条件3.已知2(21)23f x x -=+,则(3)f =()A .5B .11C .18D .214.函数2y x bx c =-+的零点为1,2,则不等式20x cx b -->的解集为()A .{|13}x x -<<B .{|3x x <-或1}x >C .{|1x x <-或3}x >D .{|31}x x -<<5.如图的曲线是幂函数n y x =在第一象限内的图象.已知n 分别取12,2±±四个值,与曲线1234C C C C 、、、相应的n 依次为()A .112,,,222--B .112,,2,22--C .11,2,2,22--D .112,,,222--6.若2ab a >,且(),0,1a b ∈,则下列不等式一定正确的是()A .11b b a<-B .2ab b >C .1ab a b+<+D .11a b<7.已知函数||1()22x f x a ⎛⎫=-+ ⎪⎝⎭,其图象无限接近直线1y =但又不与该直线相交,则1()2f x >的解集为()A .(,2)(2,)-∞-+∞B .()2,2-C .(,1)(1,)-∞-+∞ D .()1,1-8.黎曼函数(Riemann function )是一个特殊的函数,由德国数学家黎曼发现并提出,其基本定义是:()()*1,,,N ,0,0,10,1p px p q q q q R x x ⎧=∈⎪=⎨⎪=⎩为既约真分数或上的无理数(注:分子与分母是互质数的分数,称为既约分数),若()f x 是奇函数,且()()20f x f x -+=,当[]0,1x ∈时,()()f x R x =,则1725f f ⎛⎫⎛⎫-= ⎪ ⎪ ⎪⎝⎭⎝⎭()A .15-B .15C .310D .710二、多选题9.下列判断不正确的有()A .函数()xf x x =与()1,01,0x g x x ≥⎧=⎨-<⎩表示同一函数B .函数()y f x =的图象与直线1x =的交点最多有1个C .函数()f x x =与()g x =D .函数()1f x x x=-是增函数10.下列说法正确的是()A .函数()110,1x y aa a -=+>≠的图像恒过定点A ,且点A 在直线1x ym n+=,(),0m n >上,则2m n +的最小值为8.B .若102x <<,则()12x x -的最大值为18.C .函数()23240x x y x x-+-=>的最大值为2-.D .若正数x ,y 满足3xy x y =++,则xy 的最小值是9.11.若4545x y y x --+<+,则下列关系正确的是().A .x y <B .22x y <C .133yx-⎛⎫> ⎪⎝⎭D >三、填空题12.命题p :01x ∃≥,2000x x -<,则命题p 的否定为.13.已知不等式23208kx kx ++>在R 上恒成立.则k 的取值范围为.14.已知函数()()y f x x =∈R 是偶函数,当0x ≥时,()22f x x x =-,若函数()f x 在区间[],2a a +上具有单调性,则实数a 的取值范围是.四、解答题15.已知集合{|27}A x x =≤<,{|310}B x x =<<,{|}C x x a =<.(1)求A B ,A B ⋂,R A ð;(2)若A C ⊆,求a 的取值范围.16.(1)求值:()3121123320.2521624----⎛⎫⎛⎫--⨯⨯ ⎪ ⎪⎝⎭⎝⎭;(2)已知11223(0)a a a -+=>,求值:22111a a a a --++++.17.已知函数()2axb f x x +=+,且()213f =-,()124f =-.(1)求()f x 的解析式;(2)判断()f x 在()2,-+∞上的单调性,并用定义证明.(3)若对[]0,3x ∀∈,()0f x m -≥恒成立,求实数m 的取值范围.18.某企业投资生产一批新型机器,其中年固定成本为1000万元,每生产x 台,需另投入生产成本()R x 万元.当年产量不足25台时,()23R x x kx =+;当年产量不小于25台时()3200202133010R x x x =+-+,且当年产量为10台时需另投入成本1100万元;若每台设备售价200万元,通过市场分析,该企业生产的这批机器能全部销售完.(1)求k 的值;(2)求该企业投资生产这批新型机器的年利润所()W x (万元)关于年产量x (台)的函数关系式(利润=销售额-成本);(3)这批新型机器年产量为多少台时,该企业所获利润最大?并求出最大利润.19.函数=op 的图象关于坐标原点成中心对称的充要条件是函数=op 为奇函数,可以将其推广为:函数=op 的图象关于点(),P a b 成中心对称的充要条件是函数()y f x a b =+-为y 关于x 的奇函数,给定函数()131x f x =+,关于()0,b 中心对称.(1)求b 的值;(2)已知函数()2g x x mx =-+,若对任意的[]11,1x ∈-,总存在[)21,x ∈+∞,使得()()12g x f x ≤,求实数m 的取值范围.。

广东省东莞市常平中学等三校2023-2024学年高二下学期期中联考生物试卷(文字版含答案)

广东省东莞市常平中学等三校2023-2024学年高二下学期期中联考生物试卷(文字版含答案)

2023-2024学年第二学期三校联考高二生物1.下列叙述正确的是 ( )A.制作果酒的整个过程中,夹子①②均关闭,制作果醋时,夹子①②均打开B.制作果酒时应将图1装置放在18~30℃环境中,制作果醋时应将温度提高至30~35℃C.图2曲线a~b段,瓶内有大量二氧化碳和水产生,导致瓶内气压增大D.随着发酵时间的推进,葡萄糖含量降低,乙醇的产生速率先上升后趋于稳定2.人体细胞本身不能合成L-天冬酰胺酶,但其在大自然中的来源十分广泛,许多细菌和真菌都能合成。

L-天冬酰胺酶可分解天冬酰胺释放出氨,然后与奈斯勒试剂反应呈棕色。

固体培养基:主要成分有牛肉膏、蛋白胨、水、NaCl、琼脂、奈斯勒试剂。

实验结果如下图。

下列叙述正确的是 ( )A.根据实验结果可知,接种时采用的是平板划线法B.该培养基从功能来看属于鉴别培养基,其中充当氮源的成分是牛肉膏C.应选择菌落B和菌落C作为高产L-天冬酰胺酶菌株进行大量培养D.无菌技术还可以避免操作者被有害微生物感染,实验结束后的培养基不能直接丢弃3.《卫报》2022年3月24日报道,科学家们分析了来自22名匿名捐献者的血液样本,发现近80%的受试人群血液已受到微塑料污染。

某科研团队拟分离能降解塑料(聚乙烯,仅含有C、H两种元素)的细菌,解决日益严峻的“白色污染”问题。

下列相关叙述错误的是 ( )A.可在塑料回收点附近的土壤进行取样B.筛选目标细菌要使用以塑料粉末为唯一碳源的鉴定培养基C.若培养基中加入能与聚乙烯结合而显色的染色剂,目标细菌的菌落周围会出现透明圈D.观察目标细菌的菌落特征可从形状、大小和颜色等方面入手4.科学家利用蛋白质工程技术将水蛭素(一种可用于预防和治疗血栓的蛋白质)第47位的天冬酰胺替换为赖氨酸,显著提高了它的抗凝血活性,流程图如下。

已知天冬酰胺对应的密码子为AAU、AAC,赖氨酸对应的密码子为AAA、GUA等。

下列叙述错误的是 ( )A.上图的操作流程是从预期的水蛭素功能出发的B.在这项替换研究中目前可行的直接操作对象是基因C.上图中大分子物质a和b的单体序列均是唯一的D.用蛋白质工程可生产基因工程所不能生产的蛋白质5.新冠病毒通过表面刺突蛋白(S蛋白)的活性域(RBD)与人体细胞表面的ACE2受体相互作用感染细胞。

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广东省东莞市万江中学,石龙中学,常平中学三校联考2023-2024学年高二上学期11月期中英语试题学校:___________姓名:___________班级:___________考号:___________一、阅读理解Kemira Boyd had just jumped in the shower when she heard her stepmother, Tammy Boyd, knocking on the door. Kemira’s 12-day-old daughter Ryleigh was choking. Kemira tried everything, but she still couldn’t breathe. Kemira knew Ryleigh needed to get to the hospital fast.They had barely driven out of their neighborhood when a police car appeared behind them. Deputy Will Kimbro figured that the speeding driver was either too distracted to notice him or unconcerned. Kimbro soon found out it was a frightening combination of the two.Once she’d pulled over, Kemira handed the baby to Kimbro. He put a hand on her little chest. Ryleigh’s heart was barely beating. Kimbro radioed for an ambulance. At that time Ryleigh’s lips were already blue.The fact that Kimbro was there was a miracle. He had recently completed a CPR class and knew how to treat a child.“Although I was shocked, my training kicked in, and I went to work to keep that child alive,” said Kimbro. Then he began tapping Ryleigh’s chest, hoping to press her heart back into action. Thanks to the CPR class, Kimbro knew the choking child didn’t have a chance if there was a blockage, and he used one finger to clear her airway. That was a magic touch. Twenty seconds later, Ryleigh began to cry. “If she’s crying like that, she’s breathing,” said Kimbro.But they still had five more minutes until the ambulance would arrive, and Kimbro worried that Ryleigh would choke again. He continued with delicate chest compression and clearing her airway.After transferring Ryleigh to the ambulance, Kimbro drove away. At the hospital, Ryleigh recovered quickly thanks to a determined police officer who was in the right place at the right time.1.Why did Kemira stop her car outside her neighborhood?A.She wanted to ask for help.B.She had broken traffic rules.C.She needed to care for the child.D.She planned to talk with Kimbro.2.What was Kimbro like when he dealt with the emergency?A.Nervous.B.Frightened.C.Calm.D.Shocked 3.What may be the best title for the text?A.An encounter saved a life B.A CPR class is importantC.A clever and brave policeman D.A mother’s experienceMusa Haidar holds a coconut (椰子) to his ear and shakes it from side to side. Its sound pleases the market trader, who puts the large brown fruit back on the pile at his market stand in the suburb of Zanzibar, a city on the East African Island.His customers are less happy, however. A coconut going for 500 shillings a few years ago today sells for 1,500 shillings. That makes it more expensive to cook curries or other dishes using coconut milk. “The prices are not normal,” says Mr. Haidar. “Coconuts have become expensive for local people.”Why have prices gone nuts? “People are chopping (砍), chopping,” he explains. A count in 2014 found just 3.4 million coconut trees, down from 5.7 million in the late 1990s. Since hungry Zanzibaris still demand creamy fish curries and beans baked in coconut milk, falling supply has led to higher prices. Coconuts from the mainland are pricier because of high transport costs.The logging of coconut trees reflects the urbanization wave in Zanzibar and the rest of Africa where urban sprawl is the most striking feature, cities extending outwards rather than growing upwards. Because of that, when people move to a new land, they chop down the coconut trees to make space for their new homes.Moreover, some houses and island hotels have furniture made from coconut wood. Emmanuel Elias, a woodworker, explains that it is cheaper than the imported one. By law farmers cannot chop down fruit-bearing trees for furniture; in practice it is hard to stop them. Even if they obey the rules, many do not plant new trees, since these take at least six years to produce fruits, and fifteen years to reach maximum production levels. State subsidies (补贴) for seeds have proved no match for urban population growth.In his workshop, Mr. Elias dusts off a solid dressing table he is selling for 400,000 shillings. He points out that it is made of coconut wood. “This is the land of coconut trees,”he says. But for how much longer?4.What does the underlined word “sprawl” in paragraph 4 mean?A.Structure.B.Capacity.C.Expansion.D.Management. 5.Why are farmers in Zanzibar unwilling to plant coconut trees?A.They can’t get the state subsides.B.They can’t afford to wait for fruits.C.They are following the existing regulations.D.They have switched to the furniture industry.6.What can we infer about the author’s opinion on coconut trees from the text?A.He worries about their future.B.He expects their faster growth.C.He takes pride in their number.D.He doubts their value for furnitureIn the late 1990s, a scientist named Mark Blumberg stood in a lab at the University of Iowa watching a few sleeping newlyborn rats. He found that the baby rats kept making small, sharp movements in their sleep, and that their closed eyes moved from side to side in a phenomenon known as rapid eye movement (REM). Blumberg knew that the rats were fine, because he knew people do the same during REM sleep. And scientists have long had an explanation for the twitches (抽动) and REM: They are dreaming about their waking life.However, as he dug deeper, he wondered why adult rats spend only about two hours of each night in REM sleep, while baby rats spend an unusual amount of time in REM, often sleeping for sixteen hours a day and dreaming for eight.“If dreams are hints of waking life, adult rats who have more experiences should spend more time in REM sleep. Why do baby rats, whose eyes are still shut, spend so much time in REM sleep when they have too little to dream about?” he wondered. “Why do their eyes, their legs, tails and whiskers move hundreds of thousands of times during their sleep?”In the end, Blumberg concluded that it might be the other way around — perhaps the movements were sending signals to the brain to help it learn about the body.“You wouldn’t think that the body is something a brain needs to learn,” he wrote in a paper. “But we aren’t born with maps of our bodies. We can’t be, because our bodies change by the day. But in waking life, we cannot move only a single muscle. Even the simplest act ofswallowing (吞咽) employs more than thirty pairs of nerves and muscles working together. Our small and sharp movements in sleep, by contrast, are exact and precise: They involve muscles one at a time. In other words, such movements allow the muscles and nerves to form one-to-one connections that otherwise would be impossible. It’s a process that’s most important for the brain to learn about the body as we grow, suffer injuries and learn new skills.7.What was the previous explanation for REM?A.It was just an outward sign of dreams.B.It showed the difficulty in sleeping.C.It was an indicator of terrible dreams.D.It only occured to sleeping baby rats.8.What can be learned from paragraph 2?A.Baby rats have to spend all night in REM sleep.B.REM sleep just accounts for part of the sleeping time.C.It is unnecessary for baby rats to sleep 16 hours a day.D.It is not enough for adults to have two hours of REM sleep.9.What is a feature of the movements in REM sleep according to Mark Blumberg?A.They teach the brain new skills and heal injuries.B.Muscles have to work together to start the movements.C.Each of them just involves a muscle and a nerve at a time.D.They are less exact and precise than our daily movements.10.What is the text mainly about?A.The importance of REM sleep.B.The latest discoveries about dreaming.C.The relationship between dreams and waking life.D.A different explanation for the twitches during sleep.二、七选五There are hundreds of worthy destinations in the country catering to all tastes. At the top of that list is Chengdu, the perfect jumping-off point for those in search of a mix of stunning natural scenery, wildlife and some of most incredible food on the planet. In recent years thecity has expanded its offerings, including a number of new projects tourists will want to experience. 11It’s the happiest city in China.If visiting a place with happy locals is a priority for you, there’s no better city to hit than Chengdu. It has been voted the happiest city in China for 12 continuous years by an annual survey conducted by Oriental Outlook. 12It has got one most beautiful bookstore in China.The new location in Dujiangyan is the second Zhongshuge bookstore in the provincial capital. 13 Inspired by Dujiangyan’s ancient irrigation system, the new bookstore has its own features. The beautiful environment of the bookstore can attract more people who do not love books, and awaken their interest and memory in reading.There’s a spectacular new massive airport.One of the world’s most eye-catching new airports, Chengdu’s Tianfu International Airport is as modern as it gets. Beginning operations in 2021, Thantu Airport is the largest civil airport. 14 Travelers can experience a series of cutting-edge technologies at Tianfu, including facial recognition software and self-check-in booth.15There’re plans to turn Chengdu into a “Western China Science City”. Travelers visiting the “Science City” can expect to see many examples of eco-conscious and new wave architecture created by some of the most famous firms in the world. Among these is the world’s first “Unicorn Island”, the country’s next high-tech unicorn. There will also be a low-carbon Future Science and Technology City.A.The arts scene is taking off.B.It’s also a city focused on the future.C.There’s no harm in starting to dream about your next visit now.D.It’s expected to handle up to 60 million passengers per year by 2025.E.Its results combine big data, questionnaires, site visits and expert opinions.F.The first, which opened in 2017 in central Chengdu, is modeled after terrace fields.G.Whether you’re dreaming of business travel or just post-pandemic trip, here are some reasons.三、完形填空After ten years in the same company, I found my job was no longer fun. However, I didn’t have the confidence to apply for new jobs due to lack of experience. I felt 16 .A friend suggested another path— 17 . I had toyed with the idea of studying for a master’s degree but 18 stood in my way. Yet I found a course at London College of Communication, 19 my job and enrolled.During the 18 months that followed, I began to flourish (茁壮成长). Not only had I found the courage to take my 20 forward in a new, exciting direction, but the self-doubt that had followed me around like a 21 began to disappear gradually. My classmates and I treated each other as 22 . Younger students 23 my experience and knowledge when it came to group work. I made new friends and joined committees.I also decided to move out of home. Living in student halls was a(n) 24 . The halls life added to my sense of 25 and, with it, confidence. I was 26 new things every day. Even making myself a meal or 27 my small living space felt rewarding.Soon after completing my master’s, I made my way back through the university gates—this time to 28 . I am now a lecturer on the same course that I took. I 29 the person I was before and smile—she didn’t yet know her 30 . 16.A.guilty B.stuck C.relieved D.amazed 17.A.communication B.management C.educationD.employment18.A.self-doubt B.poverty C.health D.self-respect 19.A.lost B.did C.quit D.changed 20.A.course B.interest C.belief D.life 21.A.shadow B.fire C.dream D.rainbow 22.A.opponents B.relatives C.equals D.servants 23.A.valued B.questioned C.ignored D.polished 24.A.success B.experience C.embarrassment D.failure 25.A.freedom B.safety C.justice D.independence 26.A.copying B.missing C.learning D.ordering 27.A.expanding B.occupying C.deserting D.managing28.A.visit B.teach C.learn D.interview 29.A.look back on B.keep away from C.catch up with D.hold on to 30.A.image B.worth C.duty D.career四、用单词的适当形式完成句子understanding as well as remembering.(用所给词的适当形式填空)32.Sometimes, it is quite difficult to reach a compromise between parents’ (expect) and their kids’ desires. (用所给词的适当形式填空)33.He finally succeeded in gaining the qualification, and he owed his success those who had helped him.(用适当的词填空)34.Millions of people died in the early 19th century, an outbreak of cholera hit Europe. (用适当的词填空)35.The speaker, (interrupt) rudely by the audience during his speech, felt a little embarrassed. (用所给词的适当形式填空)36.depressed the doctor a lot that no one knew how to prevent or treat the disease. (用适当的词填空)37.The victim (suffer) from second or third-degree burns should be sent to the nearby hospital without any delay. (用所给词的适当形式填空)38.Many well-known people attended the international meeting in Wuhan, including astronomer and some physicists from Australia. (用适当的词填空)39.The fire spread through the house quickly and the firefighters tried (desperate) to put it out. (用所给词的适当形式填空)40.Mobile phones have changed the way we communicate, but people hold different opinions on they are useful tools for education. (用适当的词填空)五、根据所给汉语提示填空六、句型转换43.He is in favor of the idea that studying abroad helps students gain a global perspective.(同七、汉译英(整句)47.直到妈妈过来安慰她,她才停止了哭泣。

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