2020.3北京平谷区高三一模(含标准答案)

合集下载

2020年3月北京市平谷区普通高中2020届高三下学期质量监控(高考一模)生物试题及答案

2020年3月北京市平谷区普通高中2020届高三下学期质量监控(高考一模)生物试题及答案

绝密★启用前北京市平谷区普通高中2020届高三毕业班下学期质量监控(高考一模)生物试题第一部分选择题(共30分)本部分共15小题,每小题2分,共30分。

在每小题列出的四个选项中,选出最符合题目要求的一项。

1.下列生物大分子空间结构改变后,导致其功能丧失的是A.解旋酶使DNA分子的空间结构改变B.RNA聚合酶使基因片段的空间结构改变C.高温引起抗体的空间结构发生改变D.刺激引起离子通道蛋白空间结构改变2.关于线粒体和叶绿体起源的“内共生起源假说”认为:线粒体是由原始真核细胞吞噬需氧型细菌演化而成的,而叶绿体则是由原始真核细胞吞噬蓝藻(光合细菌)演化成的。

下列叙述不支持...该假说的是A.线粒体和叶绿体都含有少量的核糖体B.线粒体和叶绿体都含有少量的DNA和RNAC.线粒体和叶绿体都是具有两层生物膜的细胞器D.线粒体和叶绿体的膜都以磷脂双分子层为基本支架3.下列关于DNA聚合酶和DNA连接酶叙述正确的是A.两种酶都能催化磷酸二酯键形成,不具有专一性B.两种酶均在细胞内合成,且仅在细胞内发挥催化作用C.两种酶的化学本质都是蛋白质,能降低化学反应活化能D.PCR技术扩增DNA片段过程,反应体系中需要加入两种酶4.培养下列微生物,培养基中不用..添加碳源的是A.蓝藻B.酵母菌C.醋酸菌D.毛霉5.人体肌肉由快缩肌纤维(细胞)和慢缩肌纤维(细胞)组成。

在电镜下观察,前者几乎没有线粒体存在,后者含有大量的线粒体。

对不同运动项目的机体总需氧量、实际摄入氧量和血液中乳酸增加量进行测定,结果如下表。

下列叙述正确的是运动项目总需氧量(升) 实际摄入氧量(升) 血液乳酸增加量马拉松跑600 589 略有增加400 米跑16 2 显著增加A.马拉松跑主要依赖快缩肌纤维,400米跑主要依赖慢缩肌纤维B.快缩肌纤维供能过程产生过多,导致400米跑的人呼吸加速C.长期慢跑等有氧运动,可以提高骨骼肌中慢缩肌纤维比例D.快缩肌纤维会产生乳酸,慢缩肌纤维不会产生乳酸6.某生物基因型为AaBb,各基因位置如图。

2020年北京市平谷区高考物理一模试卷 (有详解)

2020年北京市平谷区高考物理一模试卷 (有详解)

2020年北京市平谷区高考物理一模试卷一、单选题(本大题共14小题,共42.0分)1.用 24He轰击 714N生成新核X的同时放出了 11H。

已知上述核反应中各原子核的质量分别为m N=14.00753u,mα=4.00387u,m X=17.00454u,m H=1.00815u,1u相当于931.5MeV的能量,则下列说法正确的是()A. 新核X为 917FB. 新核X为 1017NeC. 该反应释放的能量约为1.2MeVD. 该反应吸收的能量约为1.2MeV2.分子动理论较好地解释了物质的宏观热力学性质。

据此可判断下列说法中错误..的是()A. 显微镜下观察到墨水中的小炭粒在不停的作无规则运动,这反映了液体分子运动的无规则性B. 在真空、高温条件下,可以利用分子扩散向半导体材料掺入其它元素C. 水的体积很难被压缩,这是分子间存在斥力的宏观表现D. 分子间的相互作用力随着分子间距离的增大,一定先减小后增大3.一细束复色光由红、紫两色光组成的,从空气斜射向玻璃三棱镜.下面四幅图中能正确表示该复色光经三棱镜分离成两束单色光的是()A. B.C. D.4.如图所示,物体A,B用细线与弹簧连接后跨过光滑的滑轮。

A静止在倾角为60°的粗糙斜面上,B也静止。

A与斜面的动摩擦因数为μ,现将斜面倾角由60°减小到30°,B未碰到地面,A,B仍然静止。

则在此过程中()A. 物体A受到的摩擦力方向一定沿斜面向上B. 物体A对斜面的压力一定增大C. 物体A受到的摩擦力方向一定发生变化D. 物体A受到的摩擦力一定减小5.如图所示为一列简谐横波在某时刻的波形图,P是平衡位置为x=1m处的质点,Q是平衡位置为x=4m处的质点,若质点Q相继出现两个波峰的时间间隔为4s,则下列说法正确的是()A. 该波的传播速度v=1m/sB. P、Q两质点的振动方向总是相同C. P、Q两质点的振动方向总是相反D. 从图示计时,若P质点比Q质点先到达波峰,则波的传播方向沿x轴负向6.如图所示,发射地球同步卫星时,先将卫星发射至近地圆轨道1,然后经点火,使其沿椭圆轨道2运行,最后再次点火,将卫星送入同步轨道3.轨道1、2相切于Q点,轨道2、3相切于P点(如图所示),则当卫星分别在1、2、3轨道正常运行时,以下说法正确的是()①卫星在轨道3上的速率大于在轨道1上的速率②卫星在轨道3上的角速度小于在轨道1上的角速度③卫星在轨道1上的经过Q点时的加速度大于它在轨道2上经过Q点时的加速度④卫星在轨道2上的经过P点时的加速度等于它在轨道3上经过P点时的加速度。

北京市平谷区2020届高三3月质量监控(一模)化学试题(精解解析)

北京市平谷区2020届高三3月质量监控(一模)化学试题(精解解析)

北京市平谷区2019-2020学年度高三下学期质量监控化学试卷可能用到的相对原子质量:H:1 C:12 O:16 Na:23 Cl:35. 5 Zn:65第一部分选择题(共42 分)本部分共14小题,每小题3分,共42分。

在每小题列出的四个选项中,选出最符合题目要求的一项。

1.2020年5月新修订的《北京市生活垃圾管理条例》将正式实施,垃圾分类并回收利用,可以减少污染,节约自然资源。

下列垃圾投放有错误的是【答案】A【解析】本题以垃圾分类为背景,考查环境保护、物质的分类等基础知识,试题难度不大。

A.电池中含有Cu2+、Hg2+等重金属离子,对土壤和水有危害,属于有害垃圾,错误;B.剩饭菜、瓜皮果壳、枯草落叶等属于厨余垃圾,正确;C.过期药品、化妆品、油漆等属于有害垃圾,正确;D.一次性餐具、卫生纸、灰土等属于其他垃圾,正确。

2.下列有关化学用语表示正确的是A.氢氧根离子的电子式B.NH3·H2O的电离NH3·H2O NH4++OH-C.S2-的结构示意图D.间二甲苯的结构简式【答案】A【解析】本题考查化学用语,涉及电子式的书写、弱电解质的电离、结构示意图的书写、有机物结构简式的书写等基础知识,试题难度适中。

A.氢氧根离子的电子式为,正确;B.NH3·H2O为弱碱,部分电离,其电离方程式为NH3·H2OƒNH4++OH-,错误;C.表示S原子,S2-的结构示意图O项错误;D.是对二甲苯的结构简式,错误。

3.下列不能用元素周期律原理解释的是A.金属性:K>Na B.气态氢化物的稳定性:H2O>NH3C.酸性:HCl>H2SO3D.Br2从NaI溶液中置换出I2【答案】C【解析】本题考查元素周期律,涉及金属性、非金属性强弱的比较、同主族性质的递变性、同周期性质的递变性等基础知识,试题难度不大。

A.同主族从上到下金属性逐渐加强,金属性:K>Na,正确;B.非金属性越强,氢化物越稳定,非金属性:O>N,稳定性:H2O>NH3,正确;C.盐酸的酸性强于H2SO3与元素周期律没有关系,错误;D.非金属性越强,单质的氧化性越强,非金属性:Br>I,则Br2可从NaI溶液中置换出I2,正确。

2020北京平谷区高三一模生物(含答案)

2020北京平谷区高三一模生物(含答案)

2020北京平谷区高三一模生物2020.3第一部分选择题(共30分)本部分共15小题,每小题2分,共30分。

在每小题列出的四个选项中,选出最符合题目要求的一项。

(2020北京平谷一模,1,2分)下列生物大分子空间结构改变后,导致其功能丧失的是A.解旋酶使DNA分子的空间结构改变B.RNA聚合酶使基因片段的空间结构改变C.高温引起抗体的空间结构发生改变D.刺激引起离子通道蛋白空间结构改变(2020北京平谷一模,,2分)关于线粒体和叶绿体起源的“内共生起源假说”认为:线粒体是由原始真核细胞吞噬需氧型细菌演化而成的,而叶绿体则是由原始真核细胞吞噬蓝藻(光合细菌)演化成的。

下列叙述不支持...该假说的是A.线粒体和叶绿体都含有少量的核糖体B.线粒体和叶绿体都含有少量的DNA和RNAC.线粒体和叶绿体都是具有两层生物膜的细胞器D.线粒体和叶绿体的膜都以磷脂双分子层为基本支架(2020北京平谷一模,3,2分)下列关于DNA聚合酶和DNA连接酶叙述正确的是A.两种酶都能催化磷酸二酯键形成,不具有专一性B.两种酶均在细胞内合成,且仅在细胞内发挥催化作用C.两种酶的化学本质都是蛋白质,能降低化学反应活化能D.PCR技术扩增DNA片段过程,反应体系中需要加入两种酶(2020北京平谷一模,4,2分)培养下列微生物,培养基中不用..添加碳源的是A.蓝藻B.酵母菌C.醋酸菌D.毛霉(2020北京平谷一模,5,2分)人体肌肉由快缩肌纤维(细胞)和慢缩肌纤维(细胞)组成。

在电镜下观察,前者几乎没有线粒体存在,后者含有大量的线粒体。

对不同运动项目的机体总需氧量、实际摄入氧量和血液中乳酸增加量进行测定,结果如下表。

下列叙述正确的是A.马拉松跑主要依赖快缩肌纤维,400米跑主要依赖慢缩肌纤维B.快缩肌纤维供能过程产生过多CO2,导致400米跑的人呼吸加速C.长期慢跑等有氧运动,可以提高骨骼肌中慢缩肌纤维比例D.快缩肌纤维会产生乳酸,慢缩肌纤维不会产生乳酸(2020北京平谷一模,6,2分)某生物基因型为AaBb,各基因位置如图。

2020年北京市平谷区高考数学一模试卷(含答案解析)

2020年北京市平谷区高考数学一模试卷(含答案解析)

2020年北京市平谷区高考数学一模试卷一、单项选择题(本大题共10小题,共40.0分)1. 已知集合A ={x|x 2<2x},B ={x|−2<x <1},则A ∪B =( )A. (−2,1)B. (−2,2)C. (0,1)D. (0,2)2. 下列函数中,既是偶函数,又在区间(1,2)上单调递减的是( )A. y =x 12B. y =2x +12xC. y =x 43D. 3. 若1a <1b <0,则下列不等式:①a +b <ab ;②|a|>|b|;③a <b ;④ab <b 2.其中正确的不等式有( )A. ①②B. ②③C. ①④D. ③④ 4. 若双曲线mx 2−y 2=1(m >0)的一条渐近线方程为y =12x ,则双曲线的离心率为( )A. 2B. √52 C. √3 D. √55. 已知三点A(1,1),B(−1,0),C(3,−1),则AB ⃗⃗⃗⃗⃗ ⋅AC⃗⃗⃗⃗⃗ 等于( ) A. −2B. −6C. 2D. 3 6. 若将函数的图象向左平移π6个单位长度,则平移后图象的一个对称中心可以为( ) A. (π12,0) B. (π6,0) C. (π3,0) D. (π2,0) 7. 若a ⃗ ,b ⃗ 均为单位向量,则“|2a ⃗ −b ⃗ |=|a ⃗ +2b ⃗ |”是“a ⃗ ⊥b ⃗ ”的( )A. 充分不必要条件B. 必要不充分条件C. 充分必要条件D. 既不充分又不必要条件8. 已知棱台上、下底面的面积之比为1:9,则棱台的中截面分棱台成两部分的体积之比为 ( )A. 1:7B. 2:7C. 7:19D. 3:169. 某三棱锥的三视图如图所示,则三棱锥的体积为( )A. 10B. 20C. 30D. 6010. 地震里氏震级是地震强度大小的一种度量.地震释放的能量E(单位:焦耳)与地震里氏震级M之间的关系为lgE =4.8+1.5M.已知两次地震的里氏震级分别为8.0级和7.5级,若它们释放的能量分别为E 1和E 2,则E 1E 2的值所在的区间为( ) A. (1,2) B. (5,6) C. (7,8) D. (15,16)二、填空题(本大题共5小题,共25.0分)11. i 是虚数单位,复数6+7i 1+2i =______.12. 已知α∈(π2,π),sinα=35,则tan(α+3π4)= ______ . 13. 在(x 2−2x)7的展开式中,含x 2项的系数为________. 14. 已知抛物线y 2=2px 上一点M(1,m)到其焦点的距离为3,则该抛物线的准线方程为______.15. 6名同学排成一排,其中甲、乙两人必须排在一起的不同排法有______ 种.三、解答题(本大题共6小题,共85.0分)16. 在△ABC 中,∠B =π3,b =√7,_______,求BC 边上的高.从①sinA =√77②sinA =3sinC③a −c =2三个条件中任选一个,补充在上面问题中并作答.17. 某校10名学生组成该校“科技创新周”志愿服务队(简称“科服队”),他们参加活动的有关数据统计如下:(1)从“科服队”中任选3人,求这3人参加活动次数各不相同的概率;(2)从“科服队”中任选2人,用ξ表示这2人参加活动次数之差的绝对值,求随机变量ξ的分布列.18.已知如图几何体,正方形ABCD和矩形ABEF所在平面互相垂直,AF=2AB=2AD,M为AF的中点,BN⊥CE.(Ⅰ)求证:CF//平面BDM;(Ⅱ)求二面角M−BD−N的大小.19.已知函数f(x)=1x−alnx(a∈R).当a=−1时,(1)求f(x)在(1,f(1))处的切线方程;(2)设g(x)=xf(x)−1,求函数g(x)的极值;20.已知椭圆C:x2a2+y2b2=1(a>b>0)的点P(1,√32)到其左、右焦点F1、F2的距离之和等于4.(Ⅰ)求椭圆C的标准方程;(Ⅱ)若经过点F1且倾斜角为π4的直线l与椭圆交于A、B两点,求|AB|的值.21.己知{a n}是各项都为正数的数列,其前n项和为S n,且2S n=a n+1a n.(1)求证:{S n2}为等差数列;(2)设b n=(−1)na n,求{bn}的前n项和Tn;(3)求集合{(m,p)|T m22m−1=T p22p,m,p,∈N∗}【答案与解析】1.答案:B解析:本题考查了描述法、区间的定义,一元二次不等式的解法,以及并集的运算.可求出集合A,然后进行并集的运算即可.解:A={x|0<x<2};∴A∪B=(−2,2).故选:B.2.答案:A解析:本题考查了函数的单调性和函数的奇偶性,属于基础题.根据函数的奇偶性和单调性逐一判定即可.解:对于A,,定义域为[0,+∞),非奇非偶函数,故A不符合题意;对于B,,满足f(−x)=f(x),为偶函数,设t=2x,在区间(1,2)上单调递增,在t∈(2,4)上单调递增,又y=t+1t所以在区间(1,2)上单调递增,故B不符合题意;对于C,,满足f(−x)=f(x),为偶函数,但在区间(1,2)上单调递增,故C不符合题意;D.,满足f(−x)=f(x),为偶函数,当x>0时,,所以在区间(1,2)上单调递减,故D符合题意,故选D.3.答案:C解析:解:∵1a <1b <0,∴b <a <0.则下列不等式:①a +b <0<ab ,正确;②|a|>|b|,不正确;③a <b ,不正确;④ab <b 2,正确.正确的不等式有①④.故选:C .由1a <1b <0,可得b <a <0.再利用不等式的基本性质即可得出.本题考查了不等式的基本性质,考查了推理能力与计算能力,属于基础题. 4.答案:B解析:本题考查双曲线的标准方程,以及双曲线的简单性质的应用,是基础题.利用双曲线的概念和性质可解得m ,然后求解离心率.解:∵双曲线mx 2−y 2=1(m >0)的一条渐近线方程为y =12x ,∴√m =12,m =14, 则双曲线方程为x 24−y 2=1,即a =2,b =1,c =√4+1=√5,∴双曲线的离心率为e =c a =√52. 故选B .5.答案:A解析:∵A(1,1),B(−1,0),C(3,−1),∴AB ⃗⃗⃗⃗⃗ =(−2,−1),AC ⃗⃗⃗⃗⃗ =(2,−2),∴AB ⃗⃗⃗⃗⃗ ⋅AC⃗⃗⃗⃗⃗ =(−2)⋅2+(−1)⋅(−2)=−2,故选A ...6.答案:A解析:本题主要考查三角函数图象的平移和对称,属于基础题.解决此题的关键是根据函数图象平移规律求解平移后的函数解析式以及函数图象的对称中心.解:将函数y=12cos2x的图象向左平移π6个单位长度,则平移后函数的解析式为y=12cos2(x+π6)=12cos(2x+π3),由,可得:x=kπ2+π12,k∈Z,所以对称中心为(kπ2+π12,0),k∈Z,k=0时,为A中的点.故选A.7.答案:C解析:解:a⃗,b⃗ 均为单位向量,|2a⃗−b⃗ |=|a⃗+2b⃗ |⇔4a⃗2+b⃗ 2−4a⃗⋅b⃗ =a⃗2+4b⃗ 2+4a⃗⋅b⃗⇔4+1−4a⃗⋅b⃗ =1+4+4a⃗⋅b⃗⇔a⃗⋅b⃗ =0⇔“a⃗⊥b⃗ ”.∴“|2a⃗−b⃗ |=|a⃗+2b⃗ |”是“a⃗⊥b⃗ ”的充要条件.故选:C.a⃗,b⃗ 均为单位向量,|2a⃗−b⃗ |=|a⃗+2b⃗ |⇔4+1−4a⃗⋅b⃗ =1+4+4a⃗⋅b⃗ ⇔a⃗⋅b⃗ =0⇔“a⃗⊥b⃗ ”,即可判断出结论.本题考查了向量数量积运算性质、简易逻辑的判定方法,考查了推理能力与计算能力,属于基础题.8.答案:C解析:本题是基础题,考查空间想象能力,计算能力,此题关键在于面积比、边长比、体积比的相互转化. 根据棱台的体积公式,以及面积之比等于相似比的平方,求出棱台上下边长的比,利用中截面与体积比的关系,求出中截面分棱台成两部分的体积之比.解:棱台体积公式:V =13H(S 上+S 下+√S 上⋅S 下)棱台上、下底面面积之比为1:9,则上下边长比为1:3,那么依比例求出中截面边长与下边长比为2:3,上底面、中截面、下底面面积之比为1:4:9,棱台的中截面分棱台成两部分的高相同,代入体积公式得出体积比V 1V 2=1+2+44+6+9=719. 故选C .9.答案:A解析:解:由题意可知几何体是底面是直角三角形的三棱锥,顶点在底面的射影与底面三角形组成长方形,底面三角形的直角边长为:3,5,棱锥的高为4,射影几何体的体积为:13×12×3×5×4=10.故选:A .判断三视图对应的几何体的形状,利用三视图的数据,求解几何体的体积即可.本题考查三视图求解几何体的体积,判断几何体的形状是解题的关键,考查空间想象能力以及计算能力. 10.答案:B解析:本题考查了对数的运用以及运算,熟练掌握对数的运算性质是解题的关键.先把数据代入已知解析式,再利用对数的运算性质即可得出数值,再进行比较即可.解:lgE =4.8+1.5M ,∴lgE 1=4.8+1.5×8=16.8,lgE 2=4.8+1.5×7.5=16.05,∴E 1=1016.8,E 2=1016.05,∴E 1E 2=100.75,则(E 1E 2)4=(100.75)4=103=1000<1296=64, ∴E1E 2<6,∵100.75>90.75=31.5=3×√3>5,∴E1E 2的值所在的区间为(5,6), 故选B .11.答案:4−i解析:本题考查复数的运算,属于基础题.解:6+7i 1+2i =(6+7i)(1−2i)(1+2i)(1−2i)=20−5i 5=4−i .故答案为4−i . 12.答案:−7解析:解:∵α∈(π2,π),sinα=35,∴cosα=−√1−sin 2α=−45,tanα=sinαcosα=−34, ∴tan(α+3π4)=tanα+tan 3π41−tanαtan 3π4=−34−11−34=−7.故答案为:−7.由已知及同角三角函数基本关系的运用可求cosα,tanα,利用两角和的正切函数公式即可得解. 本题主要考查了运用诱导公式化简求值,同角三角函数基本关系的运用,两角和的正切函数公式的应用,属于基础题.13.答案:560解析:在二项展开式的通项公式中,令x 的幂指数等于2,求出r 的值,即可求得含x 2项的二项式系数.本题主要考查二项式定理的应用,二项展开式的通项公式,二项式系数的性质,属于基础题.解:在(x 2−2x )7的展开式中,通项公式为T r+1=C 7r ⋅(−2)r ⋅x 14−3r ,令14−3r =2,求得r =4,可得含x 2项的二项式系数为C 74·(−2)4=560. 故答案为:560.14.答案:x =−2。

2020年北京市平谷区高考一模数学试题及答案(答案图片版)

2020年北京市平谷区高考一模数学试题及答案(答案图片版)

2020年北京市平谷区第二学期质量监控试题高三数学(2020、3)第I 卷(选择题共40分)一、选择题共10题,每题4分,共40分。

在每题列出的四个选项中,选出符合题目要求的一项1.已知集合A={x|x>-1},集合B={x|x(x+2)<0},那么A ∪B 等于A.{x|x>-2}B.{x|-1<x<0}C.{x|x>-1}D.{x|-1<x<2}2.下列函数中,既是偶函数又在区间(0,+∞)上单调递增的是.A y = B.f(x)=xsinx 2.()||C f x x x =+ D.y=|x+1|3.如果b<a<0,那么下列不等式成立的是22.log ||log ||A b a <11.()()22b a B <33.C b a > 2.D ab b < 4.双曲线221(x y m c m-=>)的一条渐近线方程为x+2y=0,那么它的离心率为.A .B .2C .2D 5.设直线l 过点A(0,-1),且与圆C 22:20x y y +-=相切于点B ,那么AB AC ⋅=u u u r u u u rA.±3B.3 .C D.16.将函数f(x)=cos2x 图象上所有点向左平移4π个单位长度后得到函数g(x)的图象,如果g(x)在区间[0,a]上单调递减,那么实数a 的最大值为 .8A π .4B π .2C π 3.4D π 7.设点A,B,C 不共线,则“(),AB AC BC +⊥u u u r u u u r u u u r ”是“||||AB AC =u u u r u u u r ”A.充分不必要条件B.必要不充分条件C.充分必要条件D.既不充分又不必要条件8.有一改形塔几何体由若千个正方体构成,构成方式如图所示,上层正方体下底面的四个顶点是下层正方体上底面各边的中点。

已知最底层正方体的棱长为8,如果改形塔的最上层正方体的边长小于1,那么该塔形中正方体的个数至少是A.8B.7C.6D.49.某三棱锥的三视图如图所示,那么该三棱锥的表面中直角三角形的个数为A.1B.2C.3D.010.在声学中,声强级L(单位:dB)由公式1210lg()10I L -=给出,其中I 为声强(单位:2/).W m 160,L dB =275,L dB =那么12I I = 45.10A 45.10B - 32.10D -3.2C - 第二部分(非选择题共110分)二、填空题共5题,每题5分,共25分。

2020年3月北京市平谷区普通高中2020届高三下学期质量监控(高考一模)化学答案

2020年3月北京市平谷区普通高中2020届高三下学期质量监控(高考一模)化学答案

绝密★启用前
北京市平谷区普通高中
2020届高三毕业班下学期质量监控(高考一模)
化学试题参考答案
2020年3月
第一部分(每题3分,共42分)
题号 1 2 3 4 5 6 7
答案 A A C D B A D
题号8 9 10 11 12 13 14
答案 C D B C B C B
第二部分阅卷说明:(为便于成绩分析,网上阅卷时非选择题部分赋分要细化到每个加括号的小题)
第二部分(共58分)
15.(共10分)
(1)(1分);O(氧)(1分);
C与O同周期,核电荷数O>C,原子半径O<C,非金属性O>C(1分)
(仅答非金属性强弱关系不给分)
(2)CO(g)+H2S(g)COS(g)+H2(g) △H2=-7 kJ/mol (2分);0.25(2分)
(方程式1分,数值1分,不写状态扣1分,可逆号不占分;)
(3)> (1分)(写“大于”给分);c d (2分)(漏选给1分,错选不得分)16.(共8分)
(1)碱式滴定管(1分)(无“碱式”不得分)
(3)MnMnO3+2I-+6H+I2+2Mn2++3H2O(2分)(物质1分,配平1分,酸性环境,写氢氧根的不得分)
(4)蓝;无(2分)(每空1分,写“兰”等错字扣1分)
1。

平谷区2020一模(试题+答案)

平谷区2020一模(试题+答案)

平谷区2019-2020学年度第二学期质量监控试题高三数学2020、3第I 卷(选择题共40分)一、选择题共10题,每题4分,共40分。

在每题列出的四个选项中,选出符合题目要求的一项 1.已知集合A={x|x>-1},集合B={x|x(x+2)<0},那么A ∪B 等于 A.{x|x>-2}B.{x|-1<x<0}C.{x|x>-1}D.{x|-1<x<2}2.下列函数中,既是偶函数又在区间(0,+∞)上单调递增的是.A y = B.f(x)=xsinx2.()||C f x x x =+ D.y=|x+1|3.如果b<a<0,那么下列不等式成立的是22.log ||log ||A b a < 11.()()22b a B <33.C b a >2.D ab b <4.双曲线221(x y m c m -=>)的一条渐近线方程为x+2y=0,那么它的离心率为.A.B.2C5.设直线l 过点A(0,-1),且与圆C 22:20x y y +-=相切于点B ,那么AB AC ⋅=u u u r u u u r A.±3 B.3.CD.16.将函数f(x)=cos2x 图象上所有点向左平移4π个单位长度后得到函数g(x)的图象,如果g(x)在区间[0,a]上单调递减,那么实数a 的最大值为.8A π.4B π.2C π3.4D π 7.设点A,B,C 不共线,则“(),AB AC BC +⊥u u u r u u u r u u u r ”是“||||AB AC =u u u r u u u r”A.充分不必要条件B.必要不充分条件C.充分必要条件D.既不充分又不必要条件8.有一改形塔几何体由若千个正方体构成,构成方式如图所示,上层正方体下底面的四个顶点是下层正方体上底面各边的中点。

已知最底层正方体的棱长为8,如果改形塔的最上层正方体的边长小于1,那么该塔形中正方体的个数至少是A.8B.7C.6D.4.D9.某三棱锥的三视图如图所示,那么该三棱锥的表面中直角三角形的个数为 A.1B.2C.3D.010.在声学中,声强级L(单位:dB)由公式1210lg()10IL -=给出,其中I 为声强(单位:2/).W m 160,L dB =275,L dB =那么12I I = 45.10A45.10B -32.10D -3.2C -第二部分(非选择题共110分)二、填空题共5题,每题5分,共25分。

2020年北京市平谷区高考一模语文试题及答案

2020年北京市平谷区高考一模语文试题及答案
HTftWAScopw同时風供了2017 4¼2OI8年的刊汇曲索鉄张。伙割&叩u>诃汇i⅛名•迪浚阳年纯越杨酋的邻是同一个询——•疸建“。Λ2l>17牛込没疹入惨JUIX年曲 出现的诃•划可以从实料角及反映出科砂*人员日AΛfr的关注点.知“机号"希“深茂 学习Jit角个诃2018隼进入了 «20名。此外广人X<r⅛" (Ai)*⅞4tZ也从2017环的第 □位■上升至2018d条4互。
BL疗個廉、如识产权事不同领城不折师化•仇似卄不減区3上終就有落低仲从••之感,K葫.区块钱巳⅛r数字變冷丈用ι.o∖⅛<t⅛-^*¾⅛能合约2・(r\幷向3・()扳迅逑发展.⅛⅛tr块传自泠担炽厲块代自冷公司等.迓入了-区块传丈社会•・阶及
tΛMW,B>⅛tta*Λ¼T-*iδ<i⅜A.tt何歎字文巫的方K・孔有安金\逢明Jt中&、丐审枝和i⅛<t的新点•得列M第时代人们的认可J)⅛⅛3A4的关注W⅛⅛fi<的色尽咅洵、倫鸟技术和it务沈程外包的玲讯A司煤Atn Vn IIIUfroi⅛⅜*示.201&年区 块诫住鏗济植圾获停了13∙S<X的綬同卓。⅛fl⅛Λ也®•—生駢丈咬•如一生具有监管枚的 音乐机枸•歼妁刑冃区地敏找*建求测试渓型•用呆挺攻抵悅和世界范百虫的皈妖冷理;酒⅛tt^⅜∕f∙X<t⅛a^Λ.stΛ4 f44平台•祀鬲喑与F户卫4他尢•眾决了空孔车卓的. 让客P分<Λ4发良如钊。
14 F殉丧述中不風「•霸宋皿懋桜心“<2”的规范的一顶是(2分)
T圾总含•炊栄•曲肱方就之.乐亦扛其中矣,
2己斷禾氏•切龜于人P
3/处g.4ι事;tt∙Λi人忠。
4相公丸合诸侯•不以兵* •旁件之力也

北京市平谷区2020届高三3月质量监控(一模)英语试题(PDF版,有答案)

北京市平谷区2020届高三3月质量监控(一模)英语试题(PDF版,有答案)

平谷区2019 2020学年度第二学期高三年级质量监控英语试卷2020.3注意事项1.本试卷共12页,包括三部分,满分120分㊂考试时间100分钟㊂2.在答题卡上准确填写学校名称㊁班级㊁姓名和考号㊂3.试题答案一律填涂或书写在答题卡上,在试卷上作答无效㊂4.在答题卡上,选择题用2B铅笔作答,其他试题用黑色字迹签字笔作答㊂5.考试结束,请将答题卡交回㊂第一部分㊀知识运用(共两节,满分45分)第一节㊀语法填空(共10小题;每小题1.5分,共15分)阅读下列短文,根据短文内容填空㊂在未给提示词的空白处仅填写1个适当的单词,在给出提示词的空白处用括号内所给词的正确形式填空㊂AThis year,the World Cup has been played across different㊀1㊀(city),and Team China had training sessions even on traveling days when some participating teams chose to rest up after a tiring flight.When the team struggled,Captain Zhu Ting was always there,doing whatever was needed㊀2㊀(carry)the team forward.That s why she has become a national volleyball icon(偶像),just like Iron Hammer Lang.Never giving up,especially in a difficult situation,that s ㊀3㊀the spirit of Chinese women s volleyball means.BThe railway line㊀4㊀(connect)Beijing and Zhangjiakou,the co-host city of the Beijing 2022Winter Olympics,is the world s first intelligent,high-speed railway.It㊀5㊀(go)into operation on Dec30,2019.The railway is174km long,with a maximum design speed of 350kph.It reduces the travel time between Beijing and Zhangjiakou from over three hours to 47minutes.The train is designed with an area to store snowboards,a device to secure wheelchairs and a mobile news center㊀6㊀passengers can watch live Olympic broadcasts.CThe Twenty-four Solar terms is the Chinese㊀7㊀(tradition)way of dividing and marking time.It shows the relationship between the universe,seasons,climate and agriculture,which is uniquely created㊀8㊀Chinese ancestors.The Twenty-four Solar Terms are important instructions for the agricultural production as well as people s daily lives.At the initial stage of agriculturaldevelopment,people began to explore rules of nature and used㊀9㊀(they)to guide sowing, harvesting and other agricultural activities.Until now,it㊀10㊀(become)an essential tool to guide the agricultural production in China.And its charm and value have been increasingly recognized by the public.第二节㊀完形填空(共20小题;每小题1.5分,共30分)阅读下面短文,掌握其大意,从每题所给的A㊁B㊁C㊁D四个选项中,选出最佳选项,并在答题卡上将该项涂黑㊂Never Say QuitIn my twenty-five years of coaching,I encountered many extraordinary athletes.Yet the athlete who made the greatest impression on me wasn t one of those promising young men,but Bobby Colson.Early in the season,Bobby,who looked heavy but strong,㊀11㊀me in the school hallway. He told me he was eager to join in our track team and believed he could make an important ㊀12㊀.I was deeply㊀13㊀by his presentation and self-confidence.Given his physique,the logical role for Bobby was that of a weight man .So he did his best in trying discus(铁饼),shot pot ,only to find out these events were not㊀14㊀for him at all. So Bobby intended to try another more difficult event:two-mile race.I admired Bobby s㊀15㊀, but to myself,I questioned whether the two-mile race was a good choice.Yet Bobby was㊀16㊀and for the following weeks,he painfully but㊀17㊀struggled through his workouts. Three months later,the two-mile race was well underway.While all the other runners had already finished,Bobby㊀18㊀had three laps to go.As Bobby completed his last two of his ㊀19㊀laps,several boys from the other teams started making fun of him and㊀20㊀at him to get off the track.Bobby was crying noticeably but kept going.At this moment,our team members noticed and went to㊀21㊀Bobby on.On the last lap,all our athletes stood up to cheer Bobby on.Imagine a moving sight:Our whole team lined up㊀22㊀the track,clapping and cheering for Bobby as tears㊀23㊀down his face.After that,Bobby put in effort to support his teammates.He went from event to event㊀24㊀his teammates.When one of our athletes took a first place,Bobby was even more excited than the winner.Every teammate㊀25㊀him very much and felt lucky to have him in the team. Bobby had been right when he told me he felt he could make a significant contribution.He had joined a good team and made it into a great㊀26㊀.Since then,I ve seen many top athletes ㊀27㊀the track when they knew they weren t going to win a race.Bobby,on the contrary,never once㊀28㊀leaving that two-mile race.Once he㊀29㊀,quitting was not an option.His example helped us all to understand that talent is God given,and those who have it should be thankful,but the spirit of㊀30㊀is self-given,and we should value it.11.A.waved rmed C.limited D.stopped12.A.appearance B.promise C.contribution D.influence13.A.impressed B.frightened C.puzzled D.embarrassed14.A.satisfactory B.challenging C.suitable D.attractive15.A.enthusiasm B.generosity C.achievement D.cooperation16.A.worried B.confused C.determined D.hesitated17.A.cautiously B.proudly C.secretly D.diligently18.A.still B.already C.ever D.rather19.A.spare B.remaining C.extra D.additional20.A.crying B.throwing C.shouting D.criticizing21.A.pull B.assist C.drive D.urge22.A.over B.around C.with D.beyond23.A.rolled B.paved C.covered D.measured24.A.convincing B.appreciating peting D.encouraging25.A.envied B.loved C.respected D.believed26.A.family anization C.institution D.system27.A.check out B.give off C.walk off D.carry out28.A.supposed B.considered C.imagined D.concerned29.A.proved B.realized C.discovered D.started30.A.bravery B.unity C.perseverance D.devotion第二部分㊀阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,共30分)阅读下列短文,从每题所给A㊁B㊁C㊁D四个选项中,选出最佳选项,并在答题卡上将该项涂黑㊂AThree Modern ServicesWhen you re working a full-time job,studying or on the hunt for work,life can feel exhausting.The good news is that modern technology has made life easier in many ways,and with the following services,you ll find you have more time and energy for the things that matter. Meal kit delivery servicesMeal kit delivery services are one of the most underestimated innovations of the21st century. How they work is simple.At the beginning you choose how many people need to eat in yourhousehold.Then,what your dietary requirements are,and any other preferences.Finally,you get to choose which meal kits will be delivered to your door.No matter your diet,you can have an appropriate meal kit delivered.For example,check out these low carb meal delivery options.The kit comes complete with all the ingredients you need, already prepared.All you have to do is to follow the simple recipe to put them together and pop your meal in the oven.With meal kit delivery,you don t have to worry about cooking or spending money on takeout. Your trips to the grocery store will become easier and you ll waste less money and food. TaskrabbitOne of the most frustrating aspects of having a place you call your own is that you have to take care of the maintenance(维修).Even if you are renting,there are certain tasks that your landlord will expect you to see to,whether a leaky tap or a problematic electrical appliance.For this,Taskrabbit connects you with freelancers who are willing to take on just about any task for you.You can hire someone to take care of your leaky tap rather than spending your own time and energy doing it.You re giving someone work while enjoying your time off. PostmatesFinally,one of the most convenient and useful services is,of course,Postmates.With Postmates,you can get just about anything delivered or deliver something yourself.You can get someone to do your groceries for you simply make a list of what you need and choose whether the shopper should call you if something is out or if they can decide on replacements themselves. You can also use it for takeout,to send or receive documents,and any other delivery needs you have.We live in an age of convenience,and we should take advantage of it.Start using the above services and you ll see your stress levels drop.31.What will people first do to enjoy Meal kit delivery services?A.To check out some options.B.To pop your meal in the oven.C.To confirm the exact number of people.D.To follow the simple recipe to put them together.32.What do the three Modern Services have in common?A.They can help people save money.B.All the Modern Services are top-level.C.They can make people easily enjoy their lives.D.Young people show their preference for the three Modern Services.33.Where is the passage most likely to be taken from?A.A magazine.B.A book review.C.A novel.D.A guidebook.BLast summer,Katie Steller pulled off the freeway on her way towork in Minneapolis.She stopped at a traffic light,where a man wassitting with a sign asking for help.She rolled down her window.Hey! she shouted. I m driving around giving free haircuts.If Igo grab my chair,do you want one right now?The man looked to be in his60s.He was balding,and missing a fewteeth.As Steller liked to tell the story,he laughed,then paused.Actually, he said, I have a funeral to go to this week.I was really hoping to get a haircut. Steller pulled out a red chair from her car and helped the man cut his hair immediately.After the work was finished,Edward looked in a mirror. I look good! he said.Until last year,Steller had given such haircuts to people living on the margins(边缘)around the city.She was keenly aware of the power of her cleanup job.It s more than a haircut, she said. I want it to be a gateway,to show value and respect, but also to get to know people.I want to build relationships.Steller knew that a haircut could change a life.One changed hers:As a teen,she suffered from a severe disease,her hair thinned drastically.Seeing this,her mother arranged for Steller s first professional haircut.To sit down and have somebody look at me and talk to me like a person and not just an illness,it helped me feel cared about and less alone, she said.After that,Steller knew she wanted to have her own salon so she could help people feel the way she d felt that day.Not long after finishing cosmetology school in2009,she began what she now calls her Red Chair Project,reaching out to people on the streets.Her aim was that by doing some kind acts,others would be inspired to spread their own.Part of what broke my heart was just how lonely people looked, she said. I thought maybe I d go around and ask if people want free haircuts.I can t fix their problems,but maybe I can help them feel less alone for a moment.It all began with a belief in simple acts of kindness,such as a free haircut. The way you show up in the world matters, said Steller. You have no idea what people are going to do with the kindness that you give them.34.How did Steller react to the man s asking for help?A.She paid no attention.B.She offered a free haircut to him.C.She sent a red chair to him as a present.D.She told an interesting story to make him happy.35.What did Steller mean by saying It s more than a haircut in paragraph6?A.She thought it was a respectable job.B.She had found more advantages for the job.C.She considered haircut as a way to make friends.D.She hoped her job could make a difference to others.36.What did Steller expect from Red Chair Project?A.To earn a lot of money.B.To know more people.C.To pass down the kindness.D.To make herself stand out.37.What would be the best title for the passage?A.A Cut Above.B.A Beautiful Salon.C.The Good Belief.D.The Miracle of Love.CWhy is poverty so difficult to overcome?Why are poorer people less likely to invest in their own learning and ability development,but more likely to be addicted to television and video games?In the past,a poor person was normally considered to have bad character or have no ambition.Banerjee corrects such views and explains the economics behind the poor.Poor people tend to live with more worries in their lives,he said,so they need tools such as televisions,cell phones,junk food and video games to relieve worries more than others.But investment in learning often takes a long time to get rewards,while the poor are often impatient due to economic reasons, and their life in the meantime is getting more worrisome and boring.That goes for health.Banerjee and his wife find that the poor spend the same amount of money and time,or even more on health and medical care than the middle class group,but they tend to get bad effects.The reason is that the poor often lack the essential medical and healthy knowledge and they tend to get medical treatment when the disease has worsened to a certain stage.Besides, they tend to trust the doctors who give strong medicine because they believe such doctors are thegood ones.But in fact, strong medicine always leads to resistance to drugs and overtreatment.This kind of attitude,which emphasizes treatment rather than early prevention,has brought many poor people more economic stress and physical damage,and even has affected the education of their next generation.According to the study,children in poorer physical condition tend to spend less time in school and have lower incomes after graduation,so poverty gets inherited .When it comes to finance,Banerjee s research has found that the poor often need to borrow little and short-term loans while paying extremely high interest rates.It is also because the poor tend to take higher financial risks they often have unstable incomes and are unable to get working capital from banks,so they rely more on these high-interest loans.And these small loans put a brake on their savings against risks.How could the poor step into the middle class?Maybe starting a business is a way out.But for the extremely poor,it s impossible to get the capital they need to start a business.In most cases,a more practical option is getting a job in government agencies because comparatively speaking, government jobs are very stable,which give the poor the opportunities to be hired for the long term,to increase the range of their thinking and thus enabling families to move from poverty to the middle class.Banerjee s research provides a new perspective for governments to understand poverty,so that policies can be tailored to decrease poverty and ultimately eliminate(消除)it.38.How do the poor deal with the issue of health?A.They spend less money in preventing disease.B.They focus more on the diseases than early prevention.C.They usually think it essential to resist strong medicine.D.They are willing to get free medical treatment from the government.39.From the underlined sentence,we can learn that.A.poverty is produced by the poorB.poverty is passed down by their parentsC.poverty has some bad effects on the poorD.poverty causes people to bear more economic stress40.Banerjee considers it difficult to overcome poverty because.A.the poor have bad character or have no ambitionB.the poor prefer to invest in business rather than workC.the government hasn t taken proper and effective measureD.the poor were troubled by their lives,health and finance41.What can we learn from the passage?A.The poor have attached importance to education.B.The government can t provide the jobs for the poor.C.All the poor need to start a business for their survival.D.Banerjee s research is helpful for the government to rid of poverty.DAI can identify rare genetic disordersPeople with genetic syndromes(基因遗传综合症)sometimes have revealing facial features, but using them to make a quick and cheap diagnosis can be tricky when there are hundreds of possible conditions they may have.A new neural(神经的)network that analyses photographs of faces can help doctors narrow down the possibilities.Gurovich at biotechnology firm FDNA in Boston and his team built a neural network to look at the gestalt(形态) or overall impression of faces and return a list of the10genetic syndromes a person is most likely to have.They trained the neural network,called DeepGestalt,on17,000images correctly labeled to correspond to more than200genetic syndromes.The team then asked the AI to identify potential genetic disorders from a further502photographs of people with such conditions.It included the correct answer among its list of10responses91per cent of the time.Gurovich and his team also tested the AI s ability to distinguish between different genetic mutations(突变)that can lead to the same syndrome.They used images of people with Noonan syndrome,which can result from mutations in one of five genes.DeepGestalt accurately identified the genetic source of the physical appearance64per cent of the time.It s clearly not perfect, says Gurovich. But it s still much better than humans are at trying to do this.As the system makes its assessments,the facial regions that were most helpful in the determination are highlighted and made available for doctors to view.This helps them to understand the relationships between genetic make-up and physical appearance.The fact that the diagnosis is based on a simple photograph raises questions of privacy.If faces can reveal details about genetics,then employers and insurance providers could,in principle, secretly use such techniques to discriminate against people with a high probability of having certain disorders.However,Gurovich says the tool will only be available to doctors.Christoffer Nellaker at the University of Oxford says this technique could bring significant benefits for those with geneticsyndromes.This is not fundamentally different information than we re sharing walking down the street, or we re happy to share with Facebook or Google, he says. But questioning the data in this way means you can obtain information about health or disease status.The real value here is that for some of these extreme rare diseases,the process of diagnosis can be many,many years.This kind of technology can help narrow down the search space and then be confirmed through checking genetic markers, he says.For some diseases,this kind of technology will cut down the time to diagnose thoroughly.For others,it could perhaps add a means of finding other people with the disease and,in turn,help find new treatments or cures.42.What is the purpose of Gurovich s neural network?A.To test the AI s ability.B.To analyze photographs of faces.C.To help doctors reduce the range of the diagnosis.D.To research the overall impression of patients faces.43.What disadvantage does Deep Gestalt bring?A.It will probably involve in the people s privacy.B.It cannot provide information about health or disease.C.The diagnosis based on a simple photograph is not accurate.D.It could perhaps add a means of finding other people with the disease.44.What can we learn from the passage?A.The result of the assessments for this system is perfect.B.Deep Gestalt can correctly label200genetic syndromes.C.It seems doubtful to use AI to distinguish genetic mutations.D.This kind of technology can speed up the diagnostic process.45.What is the author s attitude to this technique?A.Supportive.B.Puzzled.C.Doubtful.D.Negative.第二节(共5小题;每小题2分,共10分)根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项㊂选项中有两项为多余选项㊂The World Water Day has been celebrated annually on22March since1992.Each year has a different theme,looking at things like the role of clean water in the world of work,ways to stop wasting water,finding ways to supply water to underprivileged groups and so on.㊀㊀46㊀㊀But it is also vital for sanitation(卫生).It is estimated that more than 700children under the age of seven die every day from illnesses linked to unsafe water and poor sanitation.The right to water and sanitation was recognized as a human right.㊀㊀47㊀㊀These include rural communities,people who have been displaced due to war and local conflicts and areas where climate change is making water more and more scarcer.Apart from the obvious health issues,a lack of accessible clean water means that people often women and children spend hours every day walking to and from distant water supplies. This means they don t have time to dedicate to work,studies and other domestic duties.㊀㊀48㊀㊀And people who are not able to walk to get their own water are particularly vulnerable.There are many charities working on creating sustainable supplies of clean water for different communities around the world.㊀㊀49㊀㊀But the fundamental problem of increasing demand for a limited resource can only be addressed by more efficient use of water,especially in industry and agriculture.Waste-water recycling,capturing rainwater,more efficient irrigation techniques and reforestation are all examples of how water can be used more efficiently.㊀㊀50㊀㊀We should support charities,raise awareness,take part in the World Water Day events that are happening all around the world and,of course,be careful with how we use water in our own lives.Visit the UN World Water Day website to find out about an event near us. Follow world water day on social media and help spread the word about this incredibly important issue.A.Clean drinking water is fundamental.B.As individuals,what can we do to help the issue?C.The search for water becomes their main occupation.D.This important work needs to continue and to expand.E.Every living cell in the body needs water to keep functioning.F.In normal conditions,the human body can only survive three or four dayswithout water.G.However,there are still at least2.1billion people around the world livingwithout safe water.第三部分㊀书面表达(共两节,满分35分)第一节(15分)假设你是红星中学高三学生李华,你的美国朋友Jim对北京的历史文化感兴趣㊂你校暑假期间将为交换生组织 Knowing Beijing 游览活动,请你写信邀请Jim来参加㊂内容包括:1.时间安排;2.活动内容;3.邀请参加㊂注意:1.词数不少于50;2.开头和结尾已经给出,不计入总词数㊂Dear Jim,㊀㊀㊀Yours,Li Hua(请务必将书面表达写在答题卡指定区域内)第二节(20分)假设你是红星中学高三学生李华㊂请根据以下四幅图的先后顺序,用英语写一篇短文向校刊 英语园地 投稿,记述你班上周组织主题为 平安校园 法制教育系列活动的全过程㊂注意:词数不少于60㊂提示词:平安校园Safe Campus㊀法律意识legal awareness㊀㊀㊀(请务必将书面表达写在答题卡指定区域内)平谷区2019-2020学年度第二学期高三年级质量监控英语试卷答案及评分标准2020.31.cities 6.where 7.traditional 9.them10.has become/becomes (大小写错误扣0.5分)第二节完形填空(共20小题;每小题1.5分,共30分)11-15DCABA 16-20CDABC 21-25DBADB26-30ACBDC 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,共30分)31-33CCA 34-37BDCA 38-41BBDD42-45CADA 第二节(共5小题;每小题2分,共10分)46-50AGCDB第四部分写作部分评分标准:第一节(15分)一、评分原则:1.本题总分15分,按4个档次给分。

2020届北京市平谷区高三下学期3月质量监控(一模)物理试题(解析版)

2020届北京市平谷区高三下学期3月质量监控(一模)物理试题(解析版)

北京市平谷区2020届高三下学期3月质量监控(一模)第一部分选择题(共42分)一、单项选择题(本题共14小题,在每小题给出的四个选项中,只有一个选项符合题意。

每小题3分,共42分)1.核反应方程235114489192056X 0U n Ba Kr 3n +→++表示中子轰击23592U 原子核可能发生的一种核反应,该核反应中质量亏损了m ∆。

关于这个核反应,下列说法中正确的是( )A. 该反应属于核聚变B.89x Kr 中的X 为33 C. 14456Ba 中含有56个中子 D. 该核反应释放出的核能为2mc ∆『答案』D『解析』『详解』A .裂变反应是较重的原子核在其它粒子的轰击下,分裂成几个中等的原子核,可知该反应属于裂变反应,故A 错误;B .根据电荷数守恒、质量数守恒知,89X Kr 的核电荷数X 为 X 925636=-=故B 错误;C .Ba 的核子数为144,其中的质子数为56,所以中子数为n 1445688=-=故C 错误;D .该核反应释放出的核能为△E ,根据爱因斯坦质能方程可知2E mc ∆=∆故D 正确。

故选D 。

2.下列说法中正确的是( )A. 布朗运动是指液体分子的无规则运动B. 物体对外做功,其内能一定减小C. 两分子间距离减小,分子间的引力和斥力都增大D. 用打气筒往自行车轮胎内打气时需要用力,说明气体分子间存在斥力『答案』C『解析』『详解』A.布朗运动是固体颗粒的运动,间接反映了液体分子的无规则运动,故A错误;B.改变内能的方式有做功和热传递,只知道物体对外做功,而不知道热传递的情况,无法确定其内能变化,故B错误;C.分子间的引力和斥力都随分子间距离的增大而减小,随分子间距离的减小而增大,但总是斥力变化得较快,故C正确;D.用打气筒往自行车轮胎内打气时需要用力,是因为气体压强增大的缘故,并不能说明气体分子间存在斥力,而且气体分子间的分子力几乎可以忽略不计,故D错误。

2020届北京市平谷区高三3月质量监控化学试题(一模)化学试题(解析版)

2020届北京市平谷区高三3月质量监控化学试题(一模)化学试题(解析版)

北京市平谷区2020届高三3月质量监控(一模)可能用到的相对原子质量:H:1 C:12 O:16 Na:23 Cl:35. 5 Zn:65第一部分选择题(共42 分)本部分共14小题,每小题3分,共42分。

在每小题列出的四个选项中,选出最符合题目要求的一项。

1.2020年5月新修订的《北京市生活垃圾管理条例》将正式实施,垃圾分类并回收利用,可以减少污染,节约自然资源。

下列垃圾投放有错误的是()A 废旧报纸、饮料瓶、电池等B 剩饭菜、瓜皮果壳、枯草落叶等C过期药品、化妆品、油漆等D一次性餐具、卫生纸、灰土等『答案』A『详解』A. 电池属于有害垃圾,A项错误;B. 剩饭菜、瓜皮果壳、枯草落叶等属于厨余垃圾,B项正确;C. 过期药品、化妆品、油漆等属于有害垃圾,C项正确;D. 一次性餐具、卫生纸、灰土等属于其他垃圾,D项正确;『答案』选A。

2.下列有关化学用语表示正确的是()A. 氢氧根离子的电子式B. NH3·H2O的电离NH3·H2O NH4++OH-C. S2-的结构示意图D. 间二甲苯的结构简式『答案』A『详解』A. 氢氧根离子的电子式为,A项正确;B. NH3·H2O为弱碱,电离可逆,正确为NH3·H2O NH4++OH-,B项错误;C. 表示S原子,S2-的结构示意图最外层有8个电子,C项错误;D. 是对二甲苯的结构简式,D项错误;『答案』选A。

3.下列不能用元素周期律原理解释的是()A. 金属性:K>NaB. 气态氢化物的稳定性:H2O>NH3C. 酸性:HCl>H2SO3D. Br2从NaI溶液中置换出I2『答案』C『详解』A. 同主族从上到下金属性逐渐加强,金属性:K>Na,A项正确;B. 非金属性越强,氢化物越稳定,非金属性:O>N,稳定性:H2O>NH3,B项正确;C. 盐酸的酸性强于H2SO3与元素周期律没有关系,C项错误;D. 非金属性越强,单质的氧化性越强,非金属性:Br>I,则Br2可从NaI溶液中置换出I2,D项正确;『答案』选C。

2020届北京市平谷区高考一模地理试题(含答案解析)

2020届北京市平谷区高考一模地理试题(含答案解析)

2020届北京市平谷区高考一模地理试题学校:___________姓名:___________班级:___________考号:___________一、单选题下图为我国某城市某日13时56分(北京时间)立竿测影示意图。

读图,完成下面小题。

1.该地位于()A.北京(116°E)B.拉萨(91°E)C.重庆(106°E)D.沈阳(124°E)2.图中影子长度最短时()A.地球接近公转轨道近日点B.海口正午太阳高度最大C.北京6点前日出东北方向D.南极科学考察的最佳季节下图为某时刻海平面气压分布状况。

读图,完成下面小题。

3.图中()A.甲为气旋,气流呈逆时针方向旋转B.乙为反气旋,中心气流辐合上升C.丙为冷锋,自西北向东南方向移动D.丁为暖锋,自东南向西北方向移动4.该时刻()A.河西走廊昼夜温差小B.黄海近海风暴潮强烈C.华北平原风和日丽D.长江中下游为阴雨天气5.下图为我国某地地质剖面示意图。

读图,图中()A.该区域为背斜构造B.甲处侵蚀最强烈C.乙河流自北向南流D.丙处岩层受挤压形成断块山霜是近地面空气中的水汽达到饱和,并且地面温度低于0℃,在物体上直接凝华而成的白色冰晶。

每年秋季第一次出现的霜叫初霜,翌年春季最后一次出现的霜叫终霜,无霜期指一年中终霜后至初霜前的一整段时间。

民间有“霜打洼地”之说。

下图为我国部分省会城市无霜期天数。

读图,完成下面小题。

6.下列四幅图中,与“霜打洼地”形成相符的是()A.B.C.D.7.甲、乙、丙、丁分别是()A.呼和浩特、武汉、成都、广州B.哈尔滨、成都、武汉、广州C.呼和浩特、上海、武汉、海口D.哈尔滨、成都、上海、海口8.相对于乙,丙无霜期长主要是()A.位于迎风坡,云量多,大气逆辐射强B.山脉对冬季风的阻挡,冬季气温高C.距离海洋近,受夏季风影响显著D.海拔高,晴天多,太阳辐射强下图为我国新疆植物物种丰富度分布趋势图。

2020年北京市平谷区高考物理一模试卷(含答案解析)

2020年北京市平谷区高考物理一模试卷(含答案解析)

2020年北京市平谷区高考物理一模试卷一、单选题(本大题共8小题,共32.0分)1.下列说法不正确的是()A. 悬浮微粒的布朗运动说明了微粒内部分子做无规则热运动B. 一定量的某种理想气体的内能只与温度有关C. 温度是描述热现象的物理量,一个系统与另一个系统达到热平衡时两系统温度相等D. 一定质量的理想气体,从外界吸收热量,其内能可能不变2.下列说法中正确的是()A. 振动的带电微粒辐射或吸收的能量可以是任意数值B. 铀核(92238U)衰变成α粒子和另一原子核,衰变产物的比结合能一定大于铀核的比结合能C. 实验表明,只要照射光的强度足够大,就一定能发生光电效应现象D. 核力将核子紧紧束缚在原子核内,因此核力只表现为引力3.声波1与声波2在同一均匀介质中传播,其波形如下图所示,则()A. 2的波速比1的波速小B. 2的波速比1的波速大C. 2的频率比1的频率高D. 2的频率比1的频率低4.将输入电压为220V,输出电压为6V的理想变压器改绕成输出电压为30V的变压器,副线圈原来是30匝,原线圈匝数不变,则副线圈新增绕的匝数为()A. 120B. 150C. 180D. 2205.如图所示有一固定的圆环,在其右侧放一条形磁铁,此时圆环中没有电流.当把磁铁向右方移走时,在圆环中产生了一定的电流,则这时的感应电流()A. 方向如图所示,将很快消失B. 方向如图所示,能继续维持C. 方向与图示相反,将很快消失D. 方向与图示相反,将继续维持6.汽车通过如图所示的一段路面,其中AB、CD分别为水平路面,BC为一段斜坡,全程路面的材质相同,各路段之间平滑连接.若汽车在从A到D的过程中发动机的功率始终保持不变,在三段路面上达到匀速行驶状态时速率分别为v1、v2、v3.则以下关于汽车的速度随时间变化的图象中可能正确的是()A.B.C.D.7.有一个电流表G,内阻R g=10Ω,满偏电流I g=3mA.要把它改装为量程为0~3V的电压表,则要()A. 要并联一个阻值0.01Ω的电阻B. 要串联一个阻值1000Ω的电阻C. 要并联一个阻值990Ω的电阻D. 要串联一个阻值990Ω的电阻8.一汽车在公路上行驶.从某时刻开始计时,其v−t图象如图所示,则可能的原因是()A. 踏下制动踏板,即俗称“踩刹车”B. 放松了加速踏板,即俗称“减油门”C. 进入上坡路段D. 汽车由粗糙程度较大的水平路面进入粗糙程度较小的水平路面二、实验题(本大题共1小题,共9.0分)9.用如图1所示的装置做“验证机械能守恒定律”的实验.(1)除了图中所示的器材外,下列器材哪个是完成该实验所必须的______?A.秒表B.刻度尺C.天平(2)按照正确的操作得到如图2所示的纸带.其中打O点时释放重物,A、B、C为三个计数点,在计数点A和B、B和C之间还各有一个点.O点到A、B、C距离分别为ℎ1、ℎ2、ℎ3.已知电源频率为f,重物质量为m,当地重力加速度为g.则OB段动能增加量为______,重力势能减少量为______.如果在误差允许的范围内,动能的增加量等于重力势能的减少量,即可验证机械能守恒.(3)某同学想在纸带上选取多个计数点,测量它们到起始点O的距离h,计算对应计数点的重物速度v,描绘v2−ℎ图象,并做如下判断:若图象是一条过原点的直线,则重物下落过程中机械能守恒.该同学的判断依据是否正确______.三、计算题(本大题共3小题,共30.0分)10.如图所示,将一可视为质点的小球从光滑斜轨上距底面竖直高度为h处静止释放,使其沿竖直的光滑圆轨道内侧运动。

2020北京平谷区高三一模英语含答案

2020北京平谷区高三一模英语含答案

2020北京平谷区高三一模英语 2020.3考生须知1.本试卷共12页,包括三部分,满分120分。

考试时间100分钟。

2.在答题卡上准确填写学校名称、班级、姓名和考号。

3.试题答案一律填涂或书写在答题卡上,在试卷上作答无效。

4.在答题卡上,选择题用2B铅笔作答,其他试题用黑色字迹签字笔作答。

5.考试结束,请将答题卡交回。

第一部分 知识运用(共两节,满分45分)第一节 语法填空(共10小题;每小题1.5分,共15分)阅读下列短文,根据短文内容填空。

在未给提示词的空白处仅填写1个适当的单词,在给出提示词的空白处用括号内所给词的正确形式填空。

AThis year, the World Cup has been played across different 1 ( city), and Team China had training sessions even on traveling days when some participating teams chose to rest up after a tiring flight. When the team struggled, Captain Zhu Ting was always there, doing whatever was needed 2 (carry) the team forward. That’s why she has become a national volleyball icon( 偶像), just like “ Iron Hammer” Lang. Never giving up, especially in a difficult situation, that’s 3 the spirit of Chinese women’s volleyball means.BThe railway line 4 ( connect) Beijing and Zhangjiakou, the co-host city of the Beijing 2022 Winter Olympics, is the world﹣s first intelligent, high-speed railway. It 5 ( go) into operation on Dec 30, 2019. The railway is 174 km long, with a maximum design speed of 350 kph. It reduces the travel time between Beijing and Zhangjiakou from over three hours to 47 minutes. The train is designed with an area to store snowboards, a device to secure wheelchairs and a mobile news center 6 passengers can watch live Olympic broadcasts.CThe “Twenty-four Solar terms” is the Chinese 7 (tradition) way of dividing and marking time. It shows the relationship between the universe, seasons, climate and agriculture, which is uniquely created 8 Chinese ancestors. The Twenty-four Solar Terms are important instructions for the agricultural production as well as people’s daily lives. At the initial stage of agricultural development, people began to explore rules of nature and used 9 ( they) to guide sowing, harvesting and other agricultural activities. Until now, it 10 ( become) an essential tool to guide the agricultural production in China. And its charm and value have been increasingly recognized by the public.第二节 完形填空(共20小题;每小题1.5分,共30分)阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

  1. 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
  2. 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
  3. 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。

2020北京平谷区高三一模生物2020.3第一部分选择题(共30分)本部分共15小题,每小题2分,共30分。

在每小题列出的四个选项中,选出最符合题目要求的一项。

1.下列生物大分子空间结构改变后,导致其功能丧失的是A.解旋酶使DNA分子的空间结构改变B.RNA聚合酶使基因片段的空间结构改变C.高温引起抗体的空间结构发生改变D.刺激引起离子通道蛋白空间结构改变2.关于线粒体和叶绿体起源的“内共生起源假说”认为:线粒体是由原始真核细胞吞噬需氧型细菌演化而成的,而叶绿体则是由原始真核细胞吞噬蓝藻(光合细菌)演化成的。

下列叙述不支持...该假说的是A.线粒体和叶绿体都含有少量的核糖体B.线粒体和叶绿体都含有少量的DNA和RNAC.线粒体和叶绿体都是具有两层生物膜的细胞器D.线粒体和叶绿体的膜都以磷脂双分子层为基本支架3.下列关于DNA聚合酶和DNA连接酶叙述正确的是A.两种酶都能催化磷酸二酯键形成,不具有专一性B.两种酶均在细胞内合成,且仅在细胞内发挥催化作用C.两种酶的化学本质都是蛋白质,能降低化学反应活化能D.PCR技术扩增DNA片段过程,反应体系中需要加入两种酶4.培养下列微生物,培养基中不用..添加碳源的是A.蓝藻B.酵母菌C.醋酸菌D.毛霉5.人体肌肉由快缩肌纤维(细胞)和慢缩肌纤维(细胞)组成。

在电镜下观察,前者几乎没有线粒体存在,后者含有大量的线粒体。

对不同运动项目的机体总需氧量、实际摄入氧量和血液中乳酸增加量进行测定,结果如下表。

下列叙述正确的是A.马拉松跑主要依赖快缩肌纤维,400米跑主要依赖慢缩肌纤维B.快缩肌纤维供能过程产生过多CO2,导致400米跑的人呼吸加速C.长期慢跑等有氧运动,可以提高骨骼肌中慢缩肌纤维比例D.快缩肌纤维会产生乳酸,慢缩肌纤维不会产生乳酸6.某生物基因型为AaBb,各基因位置如图。

关于细胞增殖中染色体及遗传物质的变化,下列叙述正确的是A.有丝分裂后期和减数第一次分裂后期,移向细胞两极的基因均是AaBbB.有丝分裂中期和减数第二次分裂后期,细胞中的染色体组数目相同C.减数第一次分裂的细胞有同源染色体,有丝分裂的细胞没有同源染色体D.有丝分裂和减数分裂染色体复制后,细胞中DNA和染色体数目均加倍7.下列关于遗传物质的叙述正确的是A.噬菌体侵染细菌实验证明DNA是主要遗传物质B.孟德尔的豌豆杂交实验证明遗传物质是DNAC.原核生物的遗传物质是DNA或RNAD.有些病毒的遗传物质是RNA8.DNA分子中碱基上连接一个“—CH3”,称为DNA甲基化,基因甲基化可以导致其不能转录。

这种变化可以在细胞间遗传。

下列叙述正确的是A.基因型相同的生物表现型可能不同B.基因甲基化引起的变异属于基因突变C.基因甲基化一定属于不利于生物的变异D.原癌、抑癌基因甲基化不会导致细胞癌变9.苇草主要生长于瑞士阿尔卑斯山的高山盛夏牧场,是一种依赖风力传粉的植物。

不同种群的苇草对铜耐受力不同,有耐受性基因的个体在无铜污染地区生长很缓慢。

调查废弃铜矿区及附近苇草种群对铜的耐受力,结果如图所示。

下列叙述正确的是A.距离矿区160m的苇草种群对铜耐受基因主要来自基因突变B.矿区内苇草与距离矿区100m的苇草存在地理隔离C.矿区土壤的选择导致苇草耐受基因频率高于非矿区D.非矿区苇草耐受性基因频率与风力和风向无关10.排尿是人和高等动物先天具有的非条件反射,在幼儿时期不能随意控制,而成年人可以有意识地控制排尿。

下列关于排尿调节叙述正确的是A.抗利尿激素分泌增多可以增加排尿总量B.成年人和婴幼儿产生排尿意识的场所不同C.成年人控制排尿和憋尿的神经递质种类全部相同D.大脑皮层的高级中枢可以调控脊髓的低级中枢11.5-羟色胺是一种与睡眠调控有关的兴奋性神经递质,它还与人的多种情绪状态有关。

如果神经元释放5-羟色胺数量不足,将会引起抑郁症。

下列叙述错误..的是A.5-羟色胺与突触后膜的受体结合后,突触后膜电位发生改变B.5-羟色胺是小分子有机物,以主动运输的方式释放到突触间隙C.氯西汀可以减缓突触间隙5-羟色胺的清除,故可用于治疗抑郁症D.麦角酸二乙酰胺特异性阻断5-羟色胺与其受体结合,故会加重抑郁症12.研究生长素(IAA)对燕麦胚芽鞘生长的影响,结果如图。

下列说法错误A.蔗糖可以延长IAA对胚芽鞘切段作用时间B.生长素能够促进胚芽鞘切段伸长生长C.结果说明蔗糖为胚芽鞘切段生长提供能量D.综合两图结果说明蔗糖与KCL的作用相同13.研究鼠对食料植物(主要是一年生草本植物)和非食料植物(包括多年生草本和阔叶草本植物)相对生物量(每100cm2总株高)的影响,实验地块设置围栏阻挡鼠进入。

据图分析错误的是A.缺少鼠时,食料植物的生长优于非食料植物B.存在鼠时,非食料植物在竞争中占有优势C.实验地块和对照地块非生物因素应该基本相同D.实验结果说明鼠不影响非食料植物相对生物量14.东亚飞蝗为迁飞性、杂食性农业害虫,喜在坚实的土壤中产卵。

为预防“蝗灾”提供科学依据,研究者对某地区多年气温、降水量与东亚飞蝗种群数量变化关系的调查结果如图。

下列分析正确的是A.影响东亚飞蝗种群数量的主要因素是降水量B.季节变化不影响东亚飞蝗种群数量变化C.疏松土壤不会影响东亚飞蝗的出生率D.可以通过样方法调查东亚飞蝗迁移路线15.图甲、乙中标注了相关限制酶的酶切位点。

培育转基因大肠杆菌的叙述错误A.若通过PCR技术提取该目的基因,应该选用引物甲和引物丙B.图中质粒和目的基因构建表达载体,应选用BclⅠ和HindⅢ剪切C.若将基因表达载体导入受体细胞中,需选用感受态的大肠杆菌D.在受体细胞中,氨苄青霉素抗性基因和目的基因可同时表达第二部分非选择题(共70分)本部分共6大题,共70分。

请用黑色字迹签字笔在答题卡上各题的答题区域内作答,在试卷上作答无效。

16.(12分)探究环境因素对小麦光合作用的影响,实验处理及结果如下。

组别及处理方法:CK:水、25℃H:水、36℃P:黄体酮、25℃P+H:黄体酮、36℃(1)D1蛋白位于叶绿体的上,参与水的分解,产物用于反应中CO2的还原。

(2)研究高温对小麦光合作用强度的影响机制,测定D1蛋白含量、D1蛋白基因表达量和D1蛋白分解基因表达量,结果如图。

①据图甲、乙的CK组和H组分析:高温下光合作用速率,推测可能与有关。

②据图丙、丁结果进一步推测高温引起H组D1蛋白含量变化的原因是:D1蛋白能可逆性转化成中转形式D1蛋白,进而避免被分解。

依据是CK组D1蛋白合成量与分解量大致相同,而H组D1蛋白合成量分解量。

(3)进一步研究黄体酮对高温下小麦光合作用强度的影响机制,结果如图中P、P+H组所示。

①图甲表明黄体酮能高温对光合作用的抑制。

②据图乙、丙、丁推测,黄体酮作用的分子机制是。

依据是。

17.(12分)大豆花叶病毒会严重降低大豆的产量和品质。

为预防抗病大豆品种乙的抗病能力减弱,科研人员用EMS诱变感病大豆,获得新的抗病品种甲。

科研人员利用甲、乙两个品种对抗性遗传进行研究。

(1)因为基因突变具有性,EMS诱变后,非入选大豆植株可能含有的基因,需要及时处理掉这些植株。

(2)利用甲、乙两品种大豆进行杂交试验,结果如下表:甲、乙两品种抗病性状依次为性性状。

(3)已知品种乙的抗性基因位于14号染色体上,为探究品种甲抗性基因的位置,科研人员设计如下杂交实验:甲乙杂交,F1自交,统计F2性状分离比。

①预期一:若F1均抗病,F2抗病 易感为13:3,说明两品种抗病性状的遗传是由对等位基因控制的,且位于染色体上。

②预期二:若F1、F2均抗病,说明甲、乙两品种抗性基因可能是或同一对染色体上不发生交叉互换的两个突变基因。

(4)SSR是DNA中的简单重复序列,非同源染色体上的SSR不同,不同品种的同源染色体上的SSR也不同,常用于染色体特异性标记。

科研人员扩增出实验一若干个体中的SSR序列,用于确定甲品系抗性基因的位置,电泳结果如图所示:图中结果说明甲品系抗性基因在号染色体上,依据是。

18.(12分)家族性高胆固醇血症(FH)可以引起严重的动脉阻塞,患者通常20岁前后死于心脏病发作。

(1)胆固醇是合成性激素的前体物质,在人体内还参与血浆中脂质的运输,所以内环境中胆固醇含量的是机体进行正常生命活动的必要条件。

(2)胆固醇合成酶(HMGCoA)的活性影响胆固醇的含量。

研究脂蛋白(LDL)对HMGCoA活性的影响,培养液中分别加入无LDL的血清、含LDL的血清,培养取自健康个体成纤维细胞,结果如图甲。

该实验结果表明。

(3)进一步研究脂蛋白(LDL)对FH患者体内HMGCoA活性的影响,研究人员将健康人和FH患者的成纤维细胞在血清培养液中培养六天(相当于图乙中的0h)后,转入去除LDL的血清培养液中培养,结果如图乙。

①由图乙可知,LDL对FH患者胆固醇合成酶(HMGCoA)的活性。

②培养液中LDL通过胞吞的方式被吸收进入健康者成纤维细胞发挥作用,但不能进入FH患者成纤维细胞,推测可能的原因是:FH患者细胞膜上缺少LDL的,导致LDL不能被识别。

③为验证上述推测,研究者进一步研究,实验处理及结果如图丙。

你认为该实验结果是否支持上述推测?判断的依据是什么? 。

(4)综合上述实验,从细胞代谢角度解释,FH患者胆固醇含量高的原因是。

19.(11分)叶片保卫细胞没有大的液泡,通过改变细胞质基质的渗透压,控制细胞吸水和失水。

当环境中水分充足时,保卫细胞吸水膨胀,气孔打开,反之关闭。

科研人员对脱落酸(ABA)调节干旱环境下拟南芥气孔开闭的机制进行了研究,结果如下图所示。

(1)ABA是细胞之间传递的分子,可以调节气孔开闭。

(2)由图甲结果可知,干旱处理会叶片细胞的渗透压,进而促进ABA的合成和分泌,增加,导致气孔关闭。

恢复供水后,ABA含量下降,气孔打开。

(3)依据图甲实验结果推测:对气孔调节功能丧失突变体施加一定浓度的ABA后,与对照组相比,如果实验结果为,则说明该突变体的气孔开闭异常是ABA合成缺陷导致。

(4)研究表明,细胞内外K+浓度差是影响保卫细胞吸水和失水的主要因素,保卫细胞膜上有K+内流和外流两种通道蛋白,K+通道的开闭受钙离子浓度的调控。

研究ABA调节气孔开闭与钙离子浓度的关系,结果如图乙。

请结合图甲,解释实验组气孔开度明显小于对照组的原因是什么? 。

20.(12分)当今我国已经成为世界上遭受生物入侵比较严重的国家。

鳄龟和巴西龟原产于密西西比河流域,我国多地水生生态系统中已经发现二者分布。

鳄龟以肉食性为主,喜食新鲜鱼类;巴西龟以虾、虫、两栖动物、小鱼、水生植物为食。

(1)湿地生态系统是由无机环境和组成的(开放/封闭)的生命系统。

(2)鳄龟和巴西龟入侵,在缺少的情况下,种群数量很容易剧增,导致入侵地生物降低,生态系统的下降。

相关文档
最新文档