2010学年第二学期4BP03

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2010年英语二阅读理解四

2010年英语二阅读理解四（最新版）目录1.概述：介绍 2010 年英语二阅读理解四的内容和要求2.文章结构：分析文章的组织结构和主题内容3.阅读理解：详细解答阅读理解题目4.技巧和策略：分享完成阅读理解题目的技巧和策略5.总结：对 2010 年英语二阅读理解四进行总结正文2010 年英语二阅读理解四主要考察了考生的阅读理解能力。

在这篇文章中，作者通过介绍一个名为“全球变暖”的现象，引导读者关注环境保护问题。

文章的组织结构清晰，主题内容明确，旨在提醒人们采取行动应对全球变暖带来的挑战。

阅读理解题目共有四道，分别针对文章的不同部分。

解答这些问题需要对文章的内容和结构有深入的理解。

例如，第一题要求我们根据文章描述，判断全球变暖现象的原因。

正确答案应该是温室气体排放过多。

而第二题则要求我们理解作者在文章中提到的应对全球变暖的措施。

正确的答案应该包括减少温室气体排放、提高能源利用效率等。

在完成阅读理解题目时，有一些技巧和策略可以提高我们的答题效率。

首先，我们要通读全文，理解文章的主题和结构。

这有助于我们在答题时迅速找到相关信息。

其次，我们要仔细阅读题目，明确题目要求。

这有助于我们避免因为理解错误而选错答案。

最后，我们要在文章中找到题目的答案。

这需要我们在阅读文章时，注意标记关键信息，以便在答题时能迅速找到答案。

总的来说，2010 年英语二阅读理解四的文章内容丰富，主题意义深远。

通过解答阅读理解题目，我们不仅可以检验自己的阅读理解能力，还可以更深入地了解全球变暖这一环境问题。

江西上饶市四中2009-2010学年度第二学期九年级数学第三次月考试题人教版

某某市四中2009—2010学年度第二学期初三第三次月考数学试题（一）一、选择题（本大题共8小题，每小题3分，共24分）1. －4的相反数是（） A ．－4B ．4C ．41-D ．41 2. 如图所示的是某几何体的三视图，则该几何体的形状是（）A ．三棱柱B ．长方体C ．圆锥D ．正方体3. 下列计算正确的是（）A ．3x +2x 2=5x 3B ．（a －b ）2=a 2－b 2C ．（－x 3）2=x 6D ．3x 2·4x 3=12x 64. 如图，小虎在篮球场上玩，从点O 出发，沿着O →A →B →O 的路径匀速跑动，能近似刻画小虎所在位置距出发点O 的距离S 与时间t 之间的函数关系的大致图象是（）5. 在中央电视台2套“开心辞典”节目中，有一期的某道题目是：如图所示，天平中放有苹果、香蕉、砝码，且两个天平都平衡，则一个苹果的重量是一个香蕉的重量的（）A ．43倍B ．32倍C ．2倍D ．3倍6. 如图，在Rt ABC △中，9068C AC BC O ∠===°，，，⊙为ABC △的内切圆，点D 是斜边AB 的中点，则tan ODA ∠=（）A ．32B ．33C ．3D ．27. 下列图形中既是轴对称图形，又是中心对称图形的是（）8. 如图，将矩形ABCD 沿对角线BD 折叠，使C 落在C '处，BC '交AD 于E ，则下列结论不一定成立的是（）A ．AD BC '=B ．EBD EDB ∠=∠C ．ABE CBD △∽△D ．sin AEABE ED∠=二、填空题（本大题共8小题，每小题3分，共24分）9. 分解因式：228x-=．10. 2008年9月27日，神舟七号航天员翟志刚完成中国历史上第一次太空行走，他相对地球行走了5 100 000米路程，用科学记数法表示为．11.（选做题：在下两题中选做一题）（Ⅰ）在1，2，3，…，2010中无理数个数是．（Ⅱ）用计算器计算：2＋3－5＝ .（精确到0.01）12. 如图，正方形ABCD 的边长为10，点E 在CB 的延长线上，10EB =，点P 在边CD 上运动（C 、D 两点除外），EP 与AB 相交于点F ，若CP x =，四边形FBCP 的面积为y ，则y 关于x 的函数关系式是．13. 方程0211=+-x 的解是． 14. 如图所示，转盘平面被等分成四个扇形，并分别填上红、黄两种颜色，自由转动这个转盘，当它停止转动时，指针停在黄色区域的概率为．一个．．所有顶点均在格点上，且至少．．有一条边长为无理数的等腰三角形. 16．如图，已知点F 的坐标为（3，0），点A B ，分别是某函数图象与x 轴、y 轴的交点，点P 是此图象上的一动点．．．设点P 的横坐标为x ，PF 的长为d ，且d 与x 之间满足关系：355d x =-（05x ≤≤），给出以下四个结论：①2AF =；②5BF =；③3OB =；④5OA =．其中正确结论的序号是_．三、解答题（共20分）17 .解不等式组：求不等式组3(2)81522x x x x ⎧--⎪⎨->⎪⎩≤的整数解． S tOA ．S tOB ．S tOC ．S tOD ．C BADOA ．B ．C ．D ．CD C 'A BEP DCBF A E红红红黄主视图左视图俯视图（第9题）y OAF BP（第16题）18.化简：24214a a a +⎛⎫+ ⎪-⎝⎭· 19.已知正比例函数y =kx 经过点P (1，2），如图所示．（1）求这个正比例函数的解析式；（2）将这个正比例函数的图像向右平移4个单位，写出在这个平移下，P '、O '的坐标，并求出平移后的直线的解析式．四、（本大题共16分）20. 在一次数学活动中，黑板上画着如图所示的图形，活动前老师在准备的四X 纸片上分别写有如下四个等式中的一个等式： ①AB DC =②ABE DCE ∠=∠③AE DE =④A D ∠=∠小明同学闭上眼睛从四X 纸片中随机抽取一X ，再从剩下的纸片中随机抽取另一X ．请结合图形解答下列两个问题：（1）当抽得①和②时，用①，②作为条件能判定BEC △是等腰三角形吗？说说你的理由；（2）请你用树状图或表格表示抽取两X 纸片上的等式所有可能出现的结果（用序号表示），并求以已经抽取的两X 纸片上的等式为条件，使BEC △不能．．构成等腰三角形的概率．21. 如图，在梯形纸片ABCD 中，AD ∥BC ，AD > CD ，将纸片沿过点D 的直线折叠，使点C 落在AD 上的点C ′处，折痕DE 交BC 于点E ，连结C ’E （1）求证：四边形CDC ’E 是菱形；（2）若BC = CD + AD ，试判断四边形ABED 的形状，并加以证明.22.美国NBA 职业篮球赛的火箭队和湖人队在本赛季已进行了5场比寒．将比赛成绩进行统计后，绘制成统计图（如图1）．请完成以下四个问题：（1）在图2中画出折线表示两队这5场比赛成绩的变化情况；（2）已知火箭队五场比赛的平均得分90x =火，请你计算湖人队五场比赛成绩的平均得分x 湖；（3）根据上述统计情况，试从平均得分、折线的走势、获胜场次和极差四个方面分别进行简要分析，请预测下一场比赛哪个队更能取得好成绩？23. 如图AB 为⊙O 的直径，BC ⊥AB 于点B ，连接OC 交⊙O 于E ，弦AD ∥OC ，弦DF ⊥AB 于点G ．（1）求证：CD 为⊙O 切线（2）若Sin ∠BAD =54，⊙O 直径为5，求DF 的长．24. 如图，已知抛物线bax ax y+-=22与x 轴交于A 、B （3, 0）两点，与y 轴交于点C ，且OC ＝3OA ，设抛物线的顶点为D 。

北京四中2010年七年级(下)期中数学试卷(含答案).

北京四中2009—2010学年度第二学期期中考试七年级年级数学试卷（考试时间100分钟，试卷满分100分）一、选择题（每题3分，共30分）（1）点P （－2，4）所在的象限为（）.（A ）第一象限（B ）第二象限（C ）第三象限（D ）第四象限（2）以下列各组长度的线段为边，能构成三角形的是（）.（A ）6cm 、8cm 、15cm （B ）7cm 、5cm 、12cm（C ）4cm 、6cm 、5cm （D ）8cm 、4cm 、3cm（3）在方程组⎩⎨⎧+==-1z 3y 1y x 2、⎩⎨⎧=-=1x y 32x 、⎩⎨⎧=-=+5y x 30y x 、⎩⎨⎧=+=3y 2x 1xy 、⎪⎩⎪⎨⎧=+=+1y x 1y 1x 1、⎩⎨⎧==1y 1x 中，是二元一次方程组的有（）。

（A ）2个（B ）3个（C ）4个（D ）5个（4）点P （m －1，m+4）在平面直角坐标系的y 轴上，则点P 的坐标是（）. （A ）（－5，0）（B ）（0，－5）（C ）（5，0）（D ）（0，5）（5）已知△ABC 的三个内角，∠A 、∠B 、∠C 满足关系式∠B+∠C ＝21∠A ，则此三角形（）.（A ）一定是直角三角形（B ）—定有一个内角为45° （C ）一定是钝角三角形（D ）一定是锐角三角形（6）已知⎩⎨⎧-==⎩⎨⎧==3y 2x 2y 1x 和都满足方程y=kx －b ，则k 、b 的值分别为（）. （A ）－5，－5 （B ）－5，－7 （C ）5，3 （D ）5，7（7）下列说法正确的是（）.（A ）经过一点有一条直线与已知直线平行.（B ）经过一点有无数条直线与已知直线平行.（C ）经过一点有且只有一条直线与已知直线平行.（D ）经过直线外一点有且只有一条直线与已知直线平行.（8）如图，已知△ABC 为直角三角形，∠C=90°，若沿图中虚线剪去∠C ，则∠1+∠2等于（）.（A ）90° （B ）135°（C ）270° （D ）315°(第8题) (第9题)（9）如图，AB//CD ，∠1＝105°，∠EAB ＝65°，则∠E 的度数是（）（A ）30° （B ）40° （C ）50° （D ）60°（10）如图所示，每个小方格都是边长为1的正方形，点A ，B 是方格纸的两个格点（即正方形的顶点），在这个4×4的方格纸中，找出格点C ，使△ABC 的面积为1个平方单位的三角形的个数是（）。

北师大2009—2010学年度第二学期第四单元测试题1及答案

(1)15︒65︒东(5)BA O北西南(4)C BAO ED ba 312(8)AD C B 北师大2009—2010学年度第二学期第四单元测试题1平面图形及其位置关系班别：_________学号：_________姓名：_________评分：_________一、填空题：（每题2分,共32分）1．82°32′5″+_____ _=180°；2．如图1，线段AD 上有两点B 、C ，图中共有______条线段；（2）（3）3．如图2，已知∠AOC=∠BOD=90º，∠AOD=150º，则∠BOC 的度数为； 4．线段AB=5cm ，C 是直线AB 上的一点，BC=8cm ，则AC=____ ____； 5．如图3，OC ⊥OD ，∠1=35°，则∠2= °；6．有一个圆形钟面，在2点30分时，时针与分针所成角的度数为____________；7．如图4，∠AOD=90°，∠COE=90°，则图中相等的锐角有____ _对；8．如图5所示，射线OA 表示_____________方向，射线OB 表示______________方向； 9．四条直线两两相交时，交点个数最多有_______个；10．如果一个角是30°，用10倍的望远镜观察，这个角应是_______°； 11．'_____'_____'____33.6︒=︒，︒=︒___________''42'2098；12．22.5°=_____直角，30°=_____平角，15°=______周角； 13．如图，BC=4cm ，BD=7cm ，D 是AC 的中点，则AC=________cm ，AB=______cm ； 14．如果a ∥b ，b ∥c ，则______∥______，因为____ ____； 15．如图所示，点C 是线段AB 上一点，点D 、E 分别是线段AC 、BC 的中点，如果AB=a ，AD=b ，其中b a 2>，那么CE=______________；16．把一根木条钉牢在墙壁上需要__________个钉子，其理论依据是__________ ；二、选择题：（每题3分，共24分）17．如图，直线a 、b 相交，∠1=130°，则∠2+∠3= （）（A ） 50° （B ） 100° （C ） 130° （D ） 180° 18．轮船行到C 处观测小岛A 的方向是北偏西48°，从A 同时观测轮船在C 处的方向是（）（A ）南偏东48° （B ）东偏北48° （C ）东偏南48° （D ）南偏东42° 19．下列语句中，正确的是（）C D B O（A ）直线比射线长（B ）射线比线段长（C ）无数条直线不可能相交于一点（D ）两条直线相交，只有一个交点20．经过任意三点中的两点共可以画出的直线条数是（）（A ）一条或三条（B ）三条（C ）两条（D ）一条21．关于直线，射线，线段的描述正确的是（）（A ）直线最长，线段最短（B ）直线、射线及线段的长度都不确定（C ）直线没有端点，射线有一个端点，线段有两个端点（D ）射线是直线长度的一半 22．下列说法中，正确的有（）（A ）过两点有且只有一条直线（B ）连结两点的线段叫做两点的距离（C ）两点之间，直线最短（D ）AB ＝BC ，则点B 是线段AC 的中点23．下列说法中正确的个数为（） ①在同一平面内不相交的两条直线叫做平行线；②平面内经过一点有且只有一条直线与已知直线垂直；③经过一点有且只有一条直线与已知直线平行；④平行同一直线的两直线平行；（A ） 1个（B ） 2个（C ） 3个（D ） 4个 24．如图①，将一块正方形木板用虚线划分成36个全等的小正方形，然后，按其中的实线切成七块形状不完全相同的小木片，制成一副七巧板．用这副七巧板拼成图②的图案，则图②中阴影部分的面积是整个图案面积的（）（A ）161 （B ） 81 （C ）71 （D ）41三、判断题：（每题2分,共20分）22．射线AB 与射线BA 表示同一条射线. （） 23．直角都相等（） 24．若∠1+∠2=90°，∠1+∠3=90°，则∠2=∠3. （） 25．过一点有且只有一条直线与已知直线平行（） 26．一条射线把一个角分成两个角,这条射线叫这个角的平分线. （） 27．两点之间，直线最短. （） 28．连结两点的线段叫做两点之间的距离. （） 29．20°50ˊ=20.5° （） 30．过两点有且只有一条直线（） 31．若AC+CB=AB ，则C 点在线段AB 上. （）四、计算题：（共24分）32．（6分）如图，已知C 是AB 的中点，D 是AC 的中点，E 是BC 的中点.①②题图9C B AEODF 22（1）若AB=18cm ，求DE 的长；（2）若CE=5cm ，求DB 的长.33．（4分）如图，已知直线AB 和CD 相交于O 点，∠COE 是直角，OF 平分∠AOE, ∠COF=34°,求∠BOD 的度数；34．（4分）如图所示，∠AOB 是平角，∠AOC=30°，∠BOD=60°，OM 、ON 分别是∠AOC 、∠BOD 的平分线，求∠MON 的度数。

宁波四中2010学年第二学期数学期末试卷答案

宁波四中2010学年第二学期期末试卷高一数学答题卷说明：本试卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分，满分150分，考试时间120分钟。

本次考试不得使用计算器。

请考生将所有题目都做在答题卷上。

第Ⅰ卷（选择题共50分）。

一．选择题：本大题共10小题，每小题5分，共50分。

在每小题给出的四个选项中，只有一项是符合题目要求的。

题号12345678910答案D B C A C B C A B D第Ⅱ卷（非选择题共100分）二．填空题：本大题共7小题，每小题4分，共28分。

11、 ; 12、; 13、; 14、;15、; 16、45º; 17、7.三．解答题：本大题共5小题，共72分。

解答应写出文字说明，证明过程或演算步骤。

18、(本小题满分14分)解　(1)若a⊥b，则a·b＝(1，x)·(2x＋3，－x)＝1×(2x＋3)＋x(－x)＝0.整理得x2－2x－3＝0，解得x＝－1或x＝3. 7分(2)所以|2+|=。

14分19、(本小题满分15分)解 (1)f(x)＝2sin xcos x－2cos2x＋1＝sin 2x－cos 2x＝sin.因此，函数f(x)的最小正周期为π. 5分(2)因为≤x≤，所以0≤2x－≤.又因为y＝sin x在内单调递增，在上单调递减，所以由0≤2x－≤，得≤x≤，由≤2x－≤，得≤x≤.所以f(x)的增区间为，减区间为. 10分又f＝0，f ＝，f＝－1，故函数f(x)在区间上的最大值为，最小值为－1. 15分20、(本小题满分14分)解(1)设等差数列{a n}的公差为d，则由已知得.∴a1＝0，d＝2.∴a n＝a1＋(n－1)d＝2n－2. 7分(2)设等比数列{b n}的公比为q，则由已知得q＋q2＝a4，∵a4＝6，∴q＝2或q＝－3.∵等比数列{b n}的各项均为正数，∴q＝2.∴{b n}的前n项和T n＝＝＝2n－1. 14分21、(本小题满分14分)解　(1)∵b＝2a·sin B，由正弦定理知sin B＝2sin A·sin B.∵B是三角形的内角，∴sin B>0，从而有sin A＝，∴A＝60°或120°，∵A是锐角，∴A＝60°.7分(2)∵10＝bcsin ，∴bc＝40，又72＝b2＋c2－2bccos ，∴b2＋c2＝89. 14分22、(本小题满分15分)解(1)设此等比数列为a1，a1q，a1q2，a1q3，…，其中a1≠0，q≠0.由题意知：a1q＋a1q2＋a1q3＝28， ①a1q＋a1q3＝2(a1q2＋2)． ②②×7－①得6a1q3－15a1q2＋6a1q＝0，即2q2－5q＋2＝0，解得q＝2或q＝.∵等比数列{a n}单调递增，∴a1＝2，q＝2，∴a n＝2n.6分(2)由(1)得b n＝－n·2n，∴S n＝b1＋b2＋…＋b n＝－(1×2＋2×22＋…＋n·2n)．设T n＝1×2＋2×22＋…＋n·2n，③则2T n＝1×22＋2×23＋…＋n·2n＋1.④由③－④，得－T n＝1×2＋1×22＋…＋1·2n－n·2n＋1＝2n＋1－2－n·2n＋1＝(1－n)·2n＋1－2，∴－T n＝－(n－1)·2n＋1－2.∴S n＝－(n－1)·2n＋1－2. 12分要使S n＋n·2n＋1>50成立，即－(n－1)·2n＋1－2＋n·2n＋1>50，即2n>26.∵24＝16<26,25＝32>26，且y＝2x是单调递增函数，∴满足条件的n的最小值为5. 15分。

2009—2010学年度第二学期期中教学质量调研

4321EDCBAsssssss2009—2010学年度第二学期期中教学质量调研七年级数学试题友情提示：亲爱的同学，这份考卷将再次展示你的学识与才华，只要你认真、细心、精心、耐心，一定会做好的.准备好，迎接挑战吧！你将要解答的这份试题分为第Ⅰ卷和第Ⅱ卷两部分，第Ⅰ卷4页为选择题，36分，第Ⅱ卷8页为非选择题，84分，试题满分120分，考试时间为120分钟.第Ⅰ卷每小题选出答案后，必须用2B 铅笔把答题卡上对应题目的答案标号（ABCD ）涂黑．如需改动，须先用橡皮擦干净，再改涂其它答案．考试时，不允许使用计算器.另外,别忘了先把密封线内的项目填写清楚吆!第Ⅰ卷(选择题共36分)一、精心选一选，相信自己的判断力！（本题共12小题, 每小题3分.）1. 在平面直角坐标系中，点A(-4,0)在A.x 轴正半轴上B.x 轴负半轴上C.y 轴正半轴上D.y 轴负半轴上2. 如图，点E 在BC 的延长线上，则下列条件中，不能判定AB ∥CD 的是 A. ∠3=∠4 B.∠B=∠DCEC.∠1=∠2.D.∠D+∠DAB=180°3. 以下4组x 、y 的值，是⎩⎨⎧-=+=-4272y x y x 的解的是A ．⎩⎨⎧-==51y xB ．⎩⎨⎧-==20y x C ．⎩⎨⎧-==3,2y x D ．⎩⎨⎧-==1,3y x4. 中国2010年上海世博会吉祥物的名字叫“海宝”，意即“四海之宝”．通过平移，可将图中的吉祥物“海宝”平移到图（４题图） A B C D5. 下列各题中，给出的三条线段不能组成三角形的是A ．4 cm ，6 cm ，10 cmB ．5cm ，3cm ，4cmC ．3cm ，8cm ，10cmD ．5cm ，9cm ，5cm6. 已知方程组⎩⎨⎧=+=+)2.(1543)1(,1529y x y x ，要想利用加减法消去未知数y,只要A.○1+○2 B.○1-○2×3 C.○1×2-○2 D.○2+○1×27. 在平面直角坐标系中,将三角形各点的纵坐标都减去3,横坐标保持不变,所得图形与原图形相比A.向右平移了3个单位B.向左平移了3个单位C.向上平移了3个单位D.向下平移了3个单位8. 将一直角三角板与两边平行的硬纸条如图所示放置，下列结论：（1）∠1＝∠2；（2）∠3＝∠4；（3）∠2+∠4＝90°；（4）∠4+∠5＝180°. 其中正确的个数是A.1B.2C.3D.49. 在△ABC 中，∠A=500，∠ABC 的角平分线和∠ACB 的角平分线相交所成的∠BOC 的度数是A. 1300B.1250C.1150D.25010. 对于下列命题：①对顶角相等；②同位角相等；③两直角相等； ④邻补角相等；⑤有且只有一条直线垂直于已知直线；⑥三角形一边上的中线把原三角形分成面积相等的两个三角形. 其中是真命题的共有A. 2个B. 3个C. 4个D. 5个11. 如图所示，把一个三角形纸片ABC 顶角向内折叠3次之后，3个顶点不重合，那么图中∠1+∠2+∠3+∠4+∠5+∠6的度数和是 A ．180° B ． 270° C ．360° D ．无法确定12. 先阅读材料，再解答：在△ABC 中，有一点P １，当P １、A 、B 、C 没有任何三点在同一直线上时，可构成三个不重叠的小三角形（如图）.当△ABC 内的点的个数增加时，若其它条件不度，三角形内互不重叠的小三角形的个数情况怎样？P 1CBAP 2P 1CBA P 3P 2P 1CBAOCBA观察上述图形，结合上表，则上表中的“？”地方应是A.2010 B.2011C.2012D.20132009—2010学年度第二学期期中教学质量调研七年级数学试题第Ⅰ卷(选择题共36分)-、本题共12小题，每小题3分.第Ⅱ卷（非选择题共84分）二、认真填一填，试试自己的身手！本大题共6小题，每小题3分，共18分. 只要求填写最后结果, 请把答案填写在题中横线上.13. 写出一个解为⎩⎨⎧-==1,3yx的二元一次方程，你写的是 .14. 已知一个多边形的内角和与它的外角和正好相等，则这个多边形是边形.15. 把一副常用三角板如图所示拼在一起，延长ED交AC于F．那么图中∠AFE的度数是 .16. 如图直线l 1//l 2，AB ⊥CD ，∠1=34°，那么∠2的度数是．17. 如图，计划把河水引到水池A 中，先引AB ⊥CD ，垂足为B ，然后沿AB 开渠，能使所开的渠道最短，这样设计的依据是______________________________.18. 把一张长方形纸片ABCD 沿EF 折叠后ED 与BC 的交点为G ，D 、C 分别在M 、N 的位置上，若∠EFG =55°，则∠1=_______，∠2=_______．三、专心解一解（本大题共8小题，满分66分）请认真读题，冷静思考．解答题应写出文字说明、证明过程或演算步骤． 19.（本题满分6分）读句画图并填空：如图，点P 是∠AOB 外一点，根据下列语句画图（1）过点P ，作线段PC ⊥OB ，垂足为C ．（2）过点P ，向右上方作射线PD ∥OA ，交OB于点D ．（3）结合所作图形，若∠O=50０，则∠P 的度数为____ ．20.（本题满分6分）解方程组 ⎩⎨⎧=-=+)2.(633)1(,844y x y x21.（本题满分6分）A(第19题（18题图）BA CDEFGMN12在直角坐标系中描出下列各组点，并将各组内点用线段依次连接起来：①（－６，５），（－１０，３），)3,9(-，（－６，５）; )3,3(-，（－２，３），②（－９，３），（－９，０），（－３，０），（－３，３）观察所得的图形，你觉得它像什么？答：22.（本题满分6分）如图，已知1∠=∠B ，CD 是△ABC 的角平分线. 求证：425∠=∠.请在下面横线上填出推理的依据：证明：∵ 1∠=∠B （已知），∴ DE ∥BC （）. ∴ 32∠=∠ （）. ∵ CD 是△ABC 的角平分线（）, ∴ 43∠=∠ （）.∴ 24∠=∠ （）.∵ 425∠+∠=∠（）,∴ 425∠=∠ （）.23.（本题满分7分）已知：如图，AB // CD ，求图形中的x 的值.24.（本题满分8分）李欣同学昨天在文具店买了2本笔记本和4支多用笔，共花了14元；王凯以同样的价格买了2本笔记本和3支多用笔，共花了12元；问笔记本和多用笔的单价各是多少元？1CDBA25.（本题满分8分）如图，在ΔABC 中，∠ACB=900 ，∠1=∠B.（1）试说明 CD 是ΔABC 的高；（2）如果AC=8，BC=6，AB=10，求CD 的长.26.（本题满分9分）如图18，已知三角形ABC ，求证：∠A ＋∠B ＋∠C ＝1800.分析：通过画平行线，将∠A 、∠B 、∠C 作等角代换，使各角之和恰为一平角. 依据所作的辅助线不同，而得到多种证法.CBA 图1821EDCBA 图19321GF HA BC 图20证法1：如图19，延长BC到D，过C画CE∥BA.∵BA∥CE（作图所知）,∴∠B＝∠1，∠A＝∠2（两直线平行，同位角、内错角相等）.又∵∠BCD＝∠BCA＋∠2＋∠1＝1800（平角的定义）,∴∠A＋∠B＋∠ACB＝1800（等量代换）.问题：如图20，过BC上任一点F，画FH∥AC，FG∥AB.这种添加辅助线的方法能证明∠A＋∠B＋∠C＝1800吗？请你试一试. 27.（本题满分10分）已知，ＡＢ∥ＣＤ，分别探讨四个图形中∠ＡＰＣ，∠ＰＡＢ，∠ＰＣＤ的关系.(1)请说明图1、图2中三个角的关系，并任选一个加以证明.(2)猜想图3、图4中三个角的关系，不必说明理由.（提示：注意适当添加辅助线吆！）（1）PDCBA（2）PDCBAP DCBA（3）PD CB A（4）2009—2010学年度第二学期期中教学质量调研七年级数学试题参考答案一、选择题（每题3分，共36分）二、填空题：（每题3分，共18分）13．答案不唯一，例如：x+y=2,x-y=4,等等，只要符合题意即可得分; 14.四； 15. 1050 16.560 17.垂线段最短 18.︒︒110,70三、解答题：19. 解：（1）（2）如右图所示（3）︒4020. 解：原方程组可化为：⎩⎨⎧=-=+)4.(2)3(,2y x y x〔（3）+（4）〕÷2，得x=2. 〔（3）-（4）〕÷2，得y=0. 所以，原方程组的解为⎩⎨⎧==.0,2y x21. 如右图，象个小房子.22. 证明：∵ 1∠=∠B ，（已知）∴ DE ∥BC ．（同位角相等两直线平行） ∴ 32∠=∠．（两直线平行内错角相等） ∵ CD 是△ABC 的角平分线，（已知） ∴ 43∠=∠．（角平分线定义） ∴ 24∠=∠．（等量代换）∵ 425∠+∠=∠，（三角形的一个外角等于与它不相邻的两个内角和） ∴ 425∠=∠．（等量代换） 23. 解：∵AB∥CD ， ∠C＝600 ，∴∠B＝1800－∠C =1800－600 ＝1200 .∴(5-2)×180O ＝x ＋150O ＋125O ＋60O ＋120O .∴x＝85024. 解：设笔记本和多用笔的单价分别为x 元、y 元. 根据题意，得⎩⎨⎧=+=+.1232,1442y x y x解之，得⎩⎨⎧==.2,3y x答：笔记本和多用笔的单价分别为3元/本、2元/本. (1) 证明：在ΔACB 中∵ ∠ACB=900,∴ ∠A + ∠B =90°.（2分）∵ ∠1=∠B, ∴ ∠A + ∠1 =90°. ∴ ∠ADC =90°.（3分）Aword 格式整理参考资料学习帮手∴ CD 是ΔABC 的高 .（4分）(2) 解： ∵ ΔABC 的面积 = （AB ×CD ）÷2=（AC ×BC ）÷2 .（1分） ∴ AB ×CD = AC ×BC . （2分） ∵ AB=10 , AC=8 , BC=6, ∴ 10×CD = 8×6. ∴ CD = 4.8 . （3分） ∴ CD 的长是4.8 .（4分） 25．证明： ∵FH ∥AC ， FG ∥AB （作图所知）,∴∠C=∠1， ∠B=∠3，∠A=∠BHF, ∠2=∠BHF （两直线平行，同位角、内错角相等）.即：∠C=∠1， ∠B=∠3，∠A=∠2.∵∠BFC=∠1+∠2+∠3 =180°（平角的定义）, ∴∠A+∠B+∠C=180°(等量代换).26．解: 图1：∠APC+∠PAB+∠PCD=360°.图2：∠APC=∠PAB+∠PCD. ∠APC+∠PAB+∠PCD=360°理由如下：过P 作PE ∥AB ∵AB ∥CD, ∴PE ∥CD.∴∠PAB+∠APE=180°.∴∠EPC+∠PCD=180°.∴∠PAB+∠APE+∠EPC+∠PCD =360°. 即∠APC+∠PAB+∠PCD=360°. ∠APC=∠PAB+∠PCD 理由如下：过P 作PE ∥AB ， ∵AB ∥CD ， ∴PE ∥CD.∴∠PAB=∠APE ∠EPC=∠PCD. ∴∠APE+∠EPC=∠PCD+∠APE. 即∠APC=∠PAB+∠PCD. (2) 图3：∠PCD=∠APC+∠PAB.图4：∠PCD=∠APC+∠PAB.。

2010～2011学年度第二学期月考教学质量检测(

5.方茴说："那时候我们不说爱，爱是多么遥远、多么沉重的字眼啊。

我们只说喜欢，就算喜欢也是偷偷摸摸的。

"6.方茴说："我觉得之所以说相见不如怀念，是因为相见只能让人在现实面前无奈地哀悼伤痛，而怀念却可以把已经注定的谎言变成童话。

"7.在村头有一截巨大的雷击木，直径十几米，此时主干上唯一的柳条已经在朝霞中掩去了莹光，变得普普通通了。

1."噢，居然有土龙肉，给我一块！"2.老人们都笑了，自巨石上起身。

而那些身材健壮如虎的成年人则是一阵笑骂，数落着自己的孩子，拎着骨棒与阔剑也快步向自家中走去。

2010～2011学年度第二学期月考教学质量检测(考生注意: 考试时间60分钟,试卷满分100分)班级姓名成绩（全卷共50分。

第一、二题用2B 铅笔在答题卡上将对应答案标号涂黑，第三题用0.5毫米黑色墨水签字笔在答卷纸指定位置作答。

考试完毕后，须上交答题卡和答卷纸）一、选择题：（共20分）1、云南省盈江县地处喜马拉雅地震带，是云南省地震多发地区。

2011年3月10日发生了里氏5.8级地震，给当地造成较严重的破坏及较大的经济损失。

那么，云南省属于我国四大地理区域中的哪个地区（）A 、北方地区B 、南方地区C 、青藏地区D 、云贵高原2、2010年入冬以来，我国北方的北京、天津、河北、山东等省市遭遇了持续的、严重的干旱灾害，给当地的农业生产和生活用水带来了很大的影响。

该区域位于我国的哪个地形区（）A 、北方地区B 、东北平原C 、华北平原D 、长江中下游平原3、我国新疆降雨稀少的主要原因是 ( )A 、纬度偏高，气温低B 、深居内陆，距海远C 、海拔高，海风吹不到D 、距海不远，但受山脉阻挡4、拉萨和成都大致位于同一纬度，读图比较两地的气温差异，以下哪个选项是形成两地气温差异的主要原因。

（）A 、受海陆位置的影响，拉萨的气温低于成都B 、受海陆位置的影响，拉萨的气温高于成都C 、受地势地形的影响，拉萨的气温高于成都D 、受地势地形的影响，拉萨的气温低于成都5、我国南方地区多水田，以种植水稻、油菜等为主，一年二至三熟，其原因是（）A 、气温高、降水丰沛B 、河流、湖泊多C 、为亚热带常绿阔叶林 D 、以平原为主6、漫画《手下留情人，筷子一次性，树木难安宁，劝君手留情，护绿记心中。

2010年英语二真题3-4篇

2010--Text 3Over the past decade, many companies had perfected the art of creating automatic behaviors –habits –among consumers. These habits have helped companies earn billions of dollars when customers eat snacks or wipe counters almost without thinking, often in response to a carefully designed set of daily cues.“There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can’t figure out how to change people’s habits,” said Dr. Curtis,the director of the Hygiene Center at the London School of Hygiene & Tropical Medicine. “We wanted to learn from private industry how to create new behaviors that happen automatically.”The companies that Dr. Curtis turned to –Procter & Gamble, Colgate-Palmolive and Unilever –had invested hundreds of millions of dollars finding the subtle cues in consumers’ lives that corporations could use to introduce new routines.If you look hard enough, you’ll find that many of the products we us e every day – chewing gums, skin moisturizers, disinfecting wipes, air fresheners, water purifiers, health snacks, teeth whiteners, fabric softeners, vitamins – are results of manufactured habits. A century ago, few people regularly brushed their teeth multiple times a day. Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day, often with Colgate, Crest or one of the other brands.A few decades ago, many people didn’t drink water outside of a meal. Then beverage companies started bottling the production of far-off springs, and now office workers unthinkingly sip bottled water all day long. Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal. Skin moisturizers are advertised as part of morning beauty rituals, slipped in between hair brushing and putting on makeup.“Our products succeed when they become part of daily or weekly patterns,” said Carol Berning, a consumer psychologist who recently retired from Procter & Gamble,the company that sold $76 billion of Tide, Crest and other products last year. “Creating positive habits is a huge part of improving our consumers’ lives, and it’s essential to making new products commercially viable.”Through experiments and observation, social scientists like Dr. Berning have learned that there is power in tying certain behaviors to habitual cues through ruthless advertising. As this new science of habit has emerged, controversies have erupted when the tactics have been used to sell questionable beauty creams or unhealthy foods.31. According to Dr. Curtis, habits like hand washing with soap .[A] should be further cultivated [B] should be changed gradually[C] are deeply rooted in history [D] are basically private concerns32. Bottled water, chewing gum and skin moisturizers are mentioned in Paragraph 5 so as to .[A] reveal their impact on peop le’s habits[B] show the urgent need of daily necessities[C] indicate their effect on people’s buying power[D] manifest the significant role of good habits33. Which of the following does NOT belong to products that help create people’s habits?[A] Tide [B] Crest [C] Colgate [D] Unilever34. From the text we know that some of consumers’ habits are developed due to .[A] perfected art of products [B] automatic behavior creation [C] commercial promotions [D] scientific experiments35. The author’s attitude toward the influence of advertisement on people’s habits is .[A] indifferent [B] negative [C] positive [D] biased2010-- Text 4Many Americans regard the jury system as a concrete expression of crucial democratic values, including the principles that all citizens who meet minimal qualifications of age and literacy are equally competent to serve on juries; that jurors should be selected randomly from a representative cross section of the community; that no citizen should be denied the right to serve on a jury on account of race, religion, sex, or national origin; that defendants are entitled to trial by their peers; and that verdicts should represent the conscience of the community and not just the letter of the law. The jury is also said to be the best surviving example of direct rather than representative democracy. In a direct democracy, citizens take turns governing themselves, rather than electing representatives to govern for them.But as recently as in 1986, jury selection procedures conflicted with these democratic ideals. In some states, for example, jury duty was limited to persons of supposedly superior intelligence, education, and moral character. Although the Supreme Court of the United States had prohibited intentional racial discrimination in jury selection as early as the 1880 case of Strauder v. West Virginia, the practice of selecting so-called elite or blue-ribbon juries provided a convenient way around this and other antidiscrimination laws.The system also failed to regularly include women on juries until the mid-20th century. Although women first served on state juries in Utah in 1898, it was not until the 1940s that a majority of states made women eligible for jury duty. Even then several states automatically exempted women from jury duty unless they personally asked to have their names included on the jury list. This practice was justified by the claim that women were needed at home, and it kept juries unrepresentative of women through the 1960s.In 1968, the Congress of the United States passed the Jury Selection and Service Act, ushering in a new era of democratic reforms for the jury. This law abolished special educational requirements for federal jurors and required them to be selected at random from a cross section of the entire community. In the landmark 1975 decision Taylor v. Louisiana, the Supreme Court extended the requirement that juries be representative of all parts of the community to the state level. The Taylor decision also declared sex discrimination in jury selection to be unconstitutional and ordered states to use the same procedures for selecting male and female jurors.36. From the principles of the US jury system, we learn that ______.[A] both literate and illiterate people can serve on juries[B] defendants are immune from trial by their peers[C] no age limit should be imposed for jury service[D] judgment should consider the opinion of the public37. The practice of selecting so-called elite jurors prior to 1968 showed_____.[A] the inadequacy of antidiscrimination laws[B] the prevalent discrimination against certain races[C] the conflicting ideals in jury selection procedures[D] the arrogance common among the Supreme Court judges38. Even in the 1960s, women were seldom on the jury list in some states because_____.[A] they were automatically banned by state laws[B] they fell far short of the required qualifications[C] they were supposed to perform domestic duties[D] they tended to evade public engagement39. After the Jury Selection and Service Act was passed___ .[A] sex discrimination in jury selection was unconstitutional and had to be abolished[B] educational requirements became less rigid in the selection of federal jurors[C] jurors at the state level ought to be representative of the entire community[D] states ought to conform to the federal court in reforming the jury system40. In discussing the US jury system, the text centers on_______.[A] its nature and problems [B] its characteristics and tradition[C] its problems and their solutions [D] its tradition and development。

北京延庆县2009—2010学年度第二学期期末模块考试卷高二数学选修2-3(理科)

北京延庆县2009—2010学年度第二学期期末模块考试卷高二数学选修2-3（理科）试卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分，共150分，考试时间120分钟.第Ⅰ卷（选择题共50分）一、选择题：本大题共12个小题，每小题5分，共60分.在每小题给出的四个选项中，只有一项是符合要求的，把正确答案的代号填在题后括号内.1. 抛掷一枚硬币，记⎩⎨⎧=反面向上正面向上01X ，则=)(X E ( )(A) 0 (B)21(C) 1 (D) 1- 2. 从参加乒乓球团体赛的5名选手中选出3名，分别担任第一、第二、第三单打，有多少种不同的安排方法 ( )(A) 53 (B) 35 (C) 35C (D) 35A3. 若n 为奇数，则nx )21(-的展开式中各项系数和为 ( ) (A) n2 (B) 12-n (C) 1- (D) 14. 随机变量X 的分布列如右表所示，则 a 的值为 ( ) (A) 1.0 (B) 4.0 (C) 6.0 (D) 15. 已知}5,4,3,2,1{}2,1{⊆⊆M ，满足这个关系式的集合共有( )个 (A) 2 (B) 4 (C) 6 (D) 86. 62)1(xx +的展开式中的常数项为 ( ) (A) 6 (B) 15 (C) 20 (D) 407. 某商场现有甲厂家生产的2种型号的电视机和乙厂家生产的3种型号的电视机各1台，现要将这5台电视机排成一列进行展销，要求同一厂家生产的电视机排在一起，不同的排列方法共有( )种(A) 24 (B) 36(C) 48 (D) 120 8. 某人投篮一次投进的概率为32，现在他连续投篮6次，且每次投篮相互之间没有影响，那么他投进的次数ξ服从参数为6，32的二项分布，记为ξ～)32,6(B ，计算 ==)2(ξP ( )(A)24320 (B) 2438 (C) 7294 (D) 2749. 甲乙两名射手在同一条件下进行射击，二人命中环数的分布列如下：甲乙下列说法正确的是 ()(A) 甲的平均成绩比乙高，甲成绩较好 (B) 乙的平均成绩比甲高，乙成绩较好(C) 二人平均成绩相同，但甲的成绩较为稳定，从稳定性方面考虑，甲好 (D) 二人平均成绩相同，但乙的成绩较为稳定，从稳定性方面考虑，乙好10. 明天上午李明要参加世博会志愿者活动，为了准时起床，他用甲、乙两个闹钟叫醒自己，假设甲闹钟准时响的概率是8.0，乙闹钟准时响的概率是9.0，则两个闹钟至少有一个准时响的概率是 ( )(A) 72.0 (B) 9.0 (C) 96.0 (D) 98.011. 将9,8,7,6,5,4,3,2,1这9个数字填在右图的9个空格中，要求每一行从左到右、每一列从上到下均增大，当4,3 固定在图中的位置时，填写表格的方法共有( )种.(A) 12 (B) 10 (C) 8 (D) 612. 用4种不同的颜色给右图中的4个部分进行着色，每块用一种颜色，有公共边的两块不能用同一种颜色，则不同的着色方案共有( )种.(A) 36 (B) 72 (C) 84 (D) 96第Ⅱ卷（非选择题共90分）.二、填空题：本大题共6小题，每小题5分，共30分. 把答案填在题中横线上.13. 从3名男主持人和5名女主持人中选出1人主持节目，有种不同的选法；若从中选出男女主持人各1人主持节目，有种不同的选法. 14. 7)21(x 展开式中，第4项的二项式系数是，第4项的系数是 . （用数字做答）15. 南非世界杯足球赛共有32支球队参赛，比赛的第一阶段是将32支球队平均分为8 个小组，每组4支球队之间进行单循环赛（即：每两队之间都要进行一场比赛），那么第一阶段一共将进行场比赛（用数字做答）.16. 某市汽车牌照号码由2个大写英文字母后接4个数字排列而成，两个英文字母不能相同，以这种方法最多可给辆汽车上牌照（用数字作答）. 17. 某学生在上学路上要经过4个路口，假设在各路口是否遇到红灯是相互独立的，遇到红灯的概率都是31, 那么该生在上学路上到第3个路口首次遇到红灯的概率为 . 18. 在5,4,3,2,1,0这六个数字组成的没有重复数字的三位数中，各位数字之和为9的三位数共有个（用数字做答）.三、解答题：本大题共5个小题，共60分.解答应写出文字说明，证明过程或演算步骤. 19.（本题满分12分）要排一个有4个唱歌节目、2个舞蹈节目的节目单，（Ⅰ）共有多少种不同的排法？（Ⅱ）要求第一和最后一个节目都要排唱歌，有多少种不同的排法？（Ⅲ）若两个舞蹈节目不能相邻，有多少种不同的排法？（Ⅳ）若4个唱歌节目出场的先后次序已定，有多少种不同的排法？（答题要求：先列式，后计算）20.（本题满分12分）从5名男生和4名女生中选出4人参加辩论赛，（Ⅰ）如果男生和女生各选2人，有多少种不同的选法？（Ⅱ）如果男生甲与女生乙必须在内，有多少种不同的选法？（Ⅲ）如果男生甲与女生乙至少有一人在内，有多少种不同的选法？（Ⅳ）如果选定的4人中必须既有男生又有女生，有多少种不同的选法？（答题要求：先列式，后计算）21.（本题满分12分）一批产品共10件，其中有2件次品，8件正品，现从中任取3件进行检查，求取到次品件数的分布列（概率值用分数表示）．22.（本题满分12分）已知甲盒中有大小相同的1个红球和3个黑球，乙盒中有大小相同的2个红球和4个黑球，现从甲乙两盒中各任取2个球，（Ⅰ）求取出的4个球均为黑球的概率；（Ⅱ）求取出的4个球中恰有一个红球的概率.23.（本题满分12分）某工厂生产一种精密仪器，产品是否合格需先后经过两道相互独立的工序检查，且当第一道工序检查合格后才能进入到第二道工序，经长期检测发现，该仪器第一道工序检查合格的概率为89，第二道工序检查合格的概率为910，已知该厂每月生产3台这种仪器.（Ⅰ）求生产一台合格仪器的概率;（Ⅱ）用ξ表示每月生产合格仪器的台数，求ξ的分布列和数学期望;（Ⅲ）若生产一台合格仪器可盈利10万元，不合格要亏损3万元，求该厂每月的期望盈利额.延庆县2009—2010学年度第二学期期末模块考试卷高二数学选修2-3（理科）试题答案及评分标准一、二、13. 15,8; 14 . 28035- 15. 48 16. 6500000 17.27418. 16 三、19.（本题满分12分）要排一个有4个唱歌节目、2个舞蹈节目的节目单，（Ⅰ）共有多少种不同的排法？（Ⅱ）要求第一和最后一个节目都要排唱歌，有多少种不同的排法？（Ⅲ）若两个舞蹈节目不能相邻，有多少种不同的排法？（Ⅳ）若4个唱歌节目出场的先后次序已定，有多少种不同的排法？（答题要求：先列式，后计算）解：（Ⅰ）共有72066=A 种不同的排法 ……………………………………3分（Ⅱ）共有2884424=⨯A A 种不同的排法 ……………………………………6分（Ⅲ）共有4802544=⨯A A 种不同的排法 ……………………………………9分（Ⅳ）共有3026=A 种不同的排法 ……………………………………12分20.（本题满分12分）从5名男生和4名女生中选出4人参加辩论赛，（Ⅰ）如果4人中男生和女生各选2人，有多少种不同的选法？（Ⅱ）如果男生甲与女生乙必须在内，有多少种不同的选法？（Ⅲ）如果男生甲与女生乙至少有一人在内，有多少种不同的选法？（Ⅳ）如果选定的4人中必须既有男生又有女生，有多少种不同的选法？（答题要求：先列式，后计算）解：（Ⅰ）共有602425=⨯C C 种不同的选法 ……………………………………3分（Ⅱ）共有2127=C 种不同的选法 ……………………………………6分（Ⅲ）共有914749=-C C 种不同的选法 (另解：91273737=++C C C )…………9分（Ⅳ）共有120444549=--C C C 种不同的选法(另解：120143524253415=⋅+⋅+⋅C C C C C C ) ……………………………12分21.（本题满分12分）一批产品共10件，其中有2件次品，8件正品，现从中任取3件进行检查，求取到次品件数的分布列（概率值用分数表示）．解：设取到次品的件数为X ，则2,1,0=X ……………………………………2分157)0(3103802=⋅==C C C X P , …………………………………………5分 157)1(3102812=⋅==C C C X P …………………………………………8分 151)2(3101822=⋅==C C C X P ………………………………………11分∴X 的分布列为：………………………………………12分22.（本题满分12分）已知甲盒中有大小相同的1个红球和3个黑球，乙盒中有大小相同的2个红球和4个黑球，现从甲乙两盒中各任取2个球，（Ⅰ）求取出的4个球均为黑球的概率；（Ⅱ）求取出的4个球中恰有一个红球的概率. 解：（Ⅰ）∵取出的4个球均为黑球，∴甲乙两盒中取出的均为黑球又∵从甲盒和乙盒取球是相互独立的，∴取出4球均为黑球的概率为:5126242423=⋅=C C C C P ……………………………5分（Ⅱ）事件“取出的4个球中恰有一个红球”包含两种情况：①甲盒中取出1个红球和1个黑球，乙盒中取出2个黑球；②甲盒中取出2个黑球，乙盒中取出1个红球和1个黑球；且①②互斥，∴取出4球中恰有一个红球的概率为:15726141224232624241311=⋅⋅+⋅=C C C C C C C C C C P ……12分 23.（本题满分12分）某工厂生产一种精密仪器，产品是否合格需先后经过两道相互独立的工序检查，且当第一道工序检查合格后才能进入到第二道工序，经长期检测发现，该仪器第一道工序检查合格的概率为89，第二道工序检查合格的概率为910，已知该厂每月生产3台这种仪器.（Ⅰ）求生产一台合格仪器的概率;（Ⅱ）用ξ表示每月生产合格仪器的台数，求ξ的分布列和数学期望;（Ⅲ）若生产一台合格仪器可盈利10万元，不合格要亏损3万元，求该厂每月的期望盈利额. 解：（Ⅰ）仪器合格意味着两道工序都检查合格，因为两道检查工序相互独立，所以一台合格仪器的概率为5410998=⨯=P ………………………………2分（Ⅱ）3,2,1,0=ξ1251)51()54()0(3003===C P ξ, ………………………………3分 12512)51()54()1(2113===C P ξ ………………………………4分 12548)51()54()2(1223===C P ξ ………………………………5分 12564)51()54()3(0333===C P ξ ………………………………6分∴ξ的分布列为：………………………………7分∴ 4.251212564312548212512112510)(==⨯+⨯+⨯+⨯=ξE …………………8分（Ⅲ）（法1）该厂每月的盈利额为η，则30,17,4,9-=η由（Ⅱ）知η的分布列为：∴2.225111125643012548171251241251)9()(==⨯+⨯+⨯+⨯-=ηE ………11分答：该厂每月的期望盈利额为2.22万元. …………………………12分（法2）∵ 生产1台仪器的盈利期望为537541051)3()(=⨯+⨯-=X E ∴生产3台仪器的盈利期望为2.2251115373)(3==⨯=X E ………11分答：该厂每月的期望盈利额为2.22万元. …………………………12分。

2010下期末初四答案(人教)

2010-2011学年第一学期期末考试初四数学参考答案及评分标准（人教版）一、选择题：（每小题3分，共42分）1、A2、A3、B4、D5、D6、D7、D8、C9、C 10、A 11、B 12、B 13、B 14、D二、填空题（每空4分，共20分）15、m ＜-1 16、30 17、图象都是抛物线或开口向下,或都具有最高点,或函数都有最大值等(不唯一，一条即可) 18、3 19、22三、解答题：20、解：（1）…………………………2分（2）（－2，4）； …………………………………………………………………5分（3）32BB '=. ………………………………………………………………8分21、解：（1）∵∠BOE =60°，∴∠A ＝12∠BOE ＝ 30°……………………………3分（2）在△ABC 中 ∵1cos 2C = ∴∠C =60° ………………………………5分又∵∠A ＝30°，∴∠ABC =90°∴AB BC ⊥ ………………………………………7分 ∴BC 是⊙O 的切线 ………………………………………………………………………8分 22、解法一：画树状图树状图正确 ………………………………………………………………………5分P 和小于6= 612 = 12………………………………………………………………… 8分解法二：用列表法：列表正确 ……………………………………………………………… 5分P 和小于6= 612 =12 ………………………………………………………8分23、解：不会穿过居民区………………………………………………………………………2分过A 作AH ⊥MN 于H ，则∠ABH=45°，AH=BH …………………………………………………4分设AH=x ，则BH=x ，MH=3x=x+400， ………………………………………………………6分∴x=2003+200=546.4＞500，∴不会穿过居民区…………………………………………8分24、解：设每间客房的日租金提高x 个5元(即5x ),则每天租出客房数会减少x 6间,此时的日租金总收入为y 元. ……………………………………………………1分根据题意,有)6120)(550(x x y -+=, ……………………………………3分即6750)5(302+--=x y …………………………………………………5分 ∴当5=x 时,y 有最大值,6750=最大值y (元), …………………………6分这时每间客房的日租金为50+5×5=75(元),装修前的日租金总收入为120×50=6000(元),6750-6000=750(元). …………7分答: 旅社将每间客房的日租金提高到75元时,客房的日租金收入最高,比装修前的日租金增加750元. ……………………………………………………………………8分 25、解：（1）证明：由正方形ABCD 知AD BC ∥PAF AEB ∴∠=∠，又90PFA ABE ∠=∠=oPFA ABE ∴△∽△ ………………………………………………………………………………2分（2）若EFP ABE △∽△，则PEF EAB ∠=∠∴必有PE AB ∥，∴四边形ABEP 为矩形A 和B 开始 1 2 3 4 5 6 和 3 4 5 6 3 4 6 3 4 5 6 4 5 6 7 5 6 7 8B A2PA EB ∴==，即2x =………………………………………………………………………5分若PFE ABE △∽△，则PEF AEB ∠=∠ 而PAF AEB ∠=∠ PEF PAF ∴∠=∠，PE PA ∴=PF AE ⊥Q ，∴点F 为AE 的中点，AE ===Q 12EF AE ∴==由PE EFAE EB =2=得5PE =，即 5x =…………………………………………8分 ∴满足条件的x 的值为2或5． ………………………………………………………9分26、解：（1）直线4222b ax a a=-=-=-，A ()0,3- …………………………3分（2）四边形ABCP 是平行四边形 ………………………………………………5分（3）C ()t ,0，先证△AEP ∽△COA ，得AO PE CO AE =，即31tt =，解得3=t ，将B ()0,1-代入抛物线t ax ax y ++=42得a t 3=，33=a ………………8分 ∴抛物线的解析式为3334332++=x x y ……………………………………9分。

2010年大学英语四级考试模拟试题第2期及答案

2010年大学英语四级考试模拟试题第2期Part I Writing(30 minutes)Directions: For this part, you are allowed 30 minutes to write a composition on the topic “Psychological Problems for College Students”. You should write at least 120 words following the outl ine given below in Chinese:1. 有些大学生存在心理问题；2. 出现这种现象的原因；3. 应对措施。

Part II Reading Comprehension (Skimming and Scanning)(15 minutes)Directions: In this part, you will have 15 minutes to go over the passage quickly. For questions 1-7, choose the best answer from the four choices marked A), B), C) and D). For questions 8-10, complete the sentences with the information given in the passage.DepressionDepression is a common type of mental disorder — most people will be affected by depression in their lives either directly or indirectly. Confusion about depression is commonplace: for example, about what depression is and what makes it different from just feeling down. There is also confusion surrounding the many types of depression that people may experience. There have been so many terms used to describe this set of feelings we’ve all felt at one time or another in our lives, to one degree or another, that it is time to set the record straight.1. Types of DepressionDepressive disorders come in different forms, just as other illnesses such as heart disease. This passage briefly describes three of the most common types of depressive disorders. However, within these types there are variations in the number of symptoms, their severity, and persistence.Major depression is manifested by a combination of symptoms that interfere with the ability to work, study, sleep, eat, and enjoy once pleasurable activities. Such a disabling episode of depression may occur only once but more commonly occurs several times in a lifetime.A less severe type of depression, dysthymia, involves long-term, chronic symptoms that do not disable, but keep one from functioning well or from feeling good. Many people with dysthymia also experience major depressive episodes at some time in their lives.Another type of depression is bipolar disorder, which is characterized by cycling mood changes: severe highs (mania) and lows (depression). Sometimes the mood switches are dramatic and rapid, but most often they are gradual. When in the depressed cycle, an individual can have any or all of the symptoms of a depressive disorder. When in the manic cycle, the individual may be overactive, over-talkative, and have agreat deal of energy. Mania often affects thinking, judgment, and social behavior in ways that cause seriousproblems and embarrassment. For example, the individual in a manic phase may feel elated and full of grandschemes that might range from unwise business decisions to romantic sprees.2. Symptoms of DepressionDepression is characterized by a number of common symptoms. Not everyone who is depressed or manic experiences every symptom. Some people experience a few symptoms, some many. Severity of symptoms varies with individuals and also varies over time.●Persistent sad, anxious, or “empty”mood●Feelings of hopelessness, pessimism●Feelings of guilt, worthlessness, helplessness●Loss of interest or pleasure in hobbies and activities that were once enjoyed●Decreased energy, fatigue, being “slowed down”●Difficulty concentrating, remembering, or making decisions●Insomnia, early-morning awakening, or oversleeping●Appetite and/or weight loss or overeating and weight gain●Thoughts of death or suicide; suicide attempts●Restlessness, irritability●Persistent physical symptoms that do not respond to treatment, such as headaches, digestive disorders and chronic pain3. Risk Factors of DepressionWhile depression can strike anyone at any time, research has identified several factors associated with an increased risk for depression:Family History — Having an immediate family member with depression increases the risk of developing depression. Other mental illnesses, such as alcoholism in family members, can also increase the risk for depression.Early Childhood Experience — Early childhood trauma, such as loss of a parent before adolescence, child neglect, physical, emotional abuse, and parental divorce are all linked to increased risk for adult depression.Stress — Negative life events, such as divorce, loss of a loved one or loss of employment are associated with increased depression. Research shows that chronic stresses (such as illness, lack of social support and numerous “daily hassles”) are also linked to depression.Alcohol — Depression and alcoholism is often seen in the same patients at the same time. Alcohol is a depressant drug and its presence in a depressed person has serious implications for treatment outcome.Residence — Depression seems to be higher in urban residents than in rural residents. In fact, one study found that depression was twice as common among city dwellers as among those who lived in rural areas.Marital Status — Depression is highest among divorced, separated, or co-habitating people. It is lowest among single and married people. People living alone have higher rates of depression than those living with others do.Work Status — Research shows that people unemployed for six months or more in the last five years had a rate of depression three times that of the general population.Physical Illness — Certain physical illnesses are associated with depression, such as thyroid disorder, hormonal imbalances, chronic viral infections, cancer and heart diseases.Gender — It is estimated that one out of every four women and one out of every ten men experience some type of depression during their lifetime. While women suffer from depression more often and attempt suicide more frequently, men are more successful in their suicide attempts. Women also suffer from unique forms of depression related to their unique biology and life experiences.Age — Most people experience their first episode of depression between the ages of 20 and 40. In fact, the average age of onset of depression is the mid-20s. Alarmingly, recent research shows that the average age of onset is decreasing with each generation. Children, adolescents and elderly persons often display unique symptoms of depression and have specific stressful events that predispose them to depression.Ethnic and cultural groups — The World Health Organization named depression the fourth most devastating illness in the world today and predicted that it would become the second ranked illness by 2020. No ethnic or cultural group is immune. While depression occurs at about the same rate in different groups, ethnic and cultural differences often impact the ways in which their members express their feelings and their willingness to seek treatment.Tobacco — Increased tobacco use has been noted in depressed persons and individuals with underlying or current depressive symptoms are likely to experience mood disturbances when they attempt to quit.4. Treatments for DepressionFortunately, there are many effective treatment options for depression. To be most effective, treatment should be specifically tailored to each individual. That is why a detailed interview by a mental health professional is extremely valuable. Established treatments for depression may include:●antidepressant medications●psychotherapy (also known as “talk therapy”or “counseling”)All of these treatments have been shown to treat depression successfully. The choice of treatment will be determined by several factors, including the type and severity of depression, by previous treatment history, and patient preference. A combination of medications and psychotherapy is used to treat most patients, although mild forms of depression may be treated with psychotherapy alone.Effective treatment is based on an accurate assessment, which identifies the causes of depression in any person. Usually depression is a result of biological, psychological and social factors, and an effective treatment plan is one that identifies all of these and develops strategies to reduce their frequency and intensity.1. How will depression affect the majority of people?A) Directly. B) Indirectly.C) Both directly and indirectly.D) Either directly or indirectly.2. How many common types of depression are discussed in this passage?A) Two. B) Three.C) Four. D) Five.3. Bipolar disorder is characterized by ____________.A) a combination of symptomsB) long-term symptomsC) cycling mood changesD) serious problems and embarrassment4. Persistent physical symptoms that do not respond to treatment might include _____________.A) feeling pessimistic B) failure to concentrateC) sleeplessness D) indigestion5. What kind of people are the least likely to suffer from depression?A) Married people.B) Separated people.C) Co-habitating people. D) Divorced people.6. What percentage of women might suffer from depression during their lifetime?A) 10%. B) 25%. C) 40%. D) 45%.7. The World Health Organization predicts that depression will ____________ by 2020.A) become the fourth most devastating illnessB) rank as one of the top two illnessesC) spread among all peopleD) be cured in some countries8. While depression occurs at about the same rate in different groups, _________ differences often impact the ways in which their members express their feelings and their willingness to seek treatment.9. There are established treatments for depression, including _____________ and psychotherapy.10. An effective treatment plan for depression should identify the symptoms and develop strategies to reduce their ____________.Part III Listening Comprehension(35 minutes)■Section ADirections: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer.11. A) The dress is ugly.B) The dress is cheap.C) The dress isn’t a real bargain.D) The dress doesn’t suit the woman.12. A) At 11:52. B) At 11:10.C) At 11:50. D) At 11:48.13. A) She prefers to live in the countryside.B) She doesn’t like the people in cities.C) She wants to move to the city.D) She plans to go to work by car.14. A) At a drugstore. B) At a bookstore.C) At a booking office. D) At a grocery.15. A) An architect. B) An accountant.C) A doctor. D) A teacher.16. A) John’s notes are not complete.B) John’s handwriting is bad.C) John’s notes are useless.D) John’s notes are full of mistakes.17. A) The man doesn’t like entertainment.B) The man lives close to a train station.C) The woman can’t bear any noise.D) The woman wants to buy an apartment.18. A) He doesn’t like dessert very much.B) He will have some chocolate cake.C) He will go to visit his doctor.D) He wants to stay fit.Questions 19 to 22 are based on the conversation you have just heard.19. A) To talk to Sandra.B) To cancel her appointment.C) To make an appointment.D) To invite Sandra to a party.20. A) Design her hair by herself.B) Have her hair done by Betty.C) Make an appointment with Sandra.D) Go to another hair salon.21. A) Have her hair cut.B) Go to visit Sandra.C) See a gentleman. D) Attend a party.22. A) Happy. B) Worried.C) Angry. D) Disappointed.Questions 23 to 25 are based on the conversation you have just heard.23. A) General Electric. B) General Motors.C) United Motors. D) United Electric.24. A) Her mother taught her.B) She learned it in college.C) She learned it from her work.D) She lived in Japan for three years.25. A) She wants to earn more money.B) She wants to learn foreign languages.C) She wants more opportunities for advancement.D) She wants to do business in Asia.■Section BDirections: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).Passage OneQuestions 26 to 28 are based on the passage you have just heard.26. A) It can change the earth of the grassland.B) It can cut down the growth rate of weeds.C) It can offer natural fertilizers to the grass.D) It can keep the grassland in good condition.27. A) When the grass is less than five centimeters high.B) When the grass is about ten centimeters high.C) When the grass is more than fifteen centimeters high.D) When the grass is less than fifteen centimeters high.28. A) They need electric fences and watering places.B) They need paddocks and special grazing areas.C) They need water supplies and strong fences.D) They need stronger fences and guard animals.Passage TwoQuestions 29 to 32 are based on the passage you have just heard.29. A) Her daughter.B) Harold “Matt” Matson.C) Her husband.D) A German doll.30. A) About three hundred dollars.B) More than twenty-seven thousand dollars.C) No more than ten thousand dollars.D) About twenty thousand dollars.31. A) He thinks Barbies are harmful to people’s health.B) He thinks Barbies make girls pay less attention to their studies.C) He thinks Saudi Arabia is a good example.D) He thinks Barbies make girls care about their appearance too much.32. A) Supportive. B) Opposed.C) Indifferent. D) Neutral.Passage ThreeQuestions 33 to 35 are based on the passage you have just heard.33. A) The student gets three points.B) The student gets one point.C) The student gets four points.D) The student fails in the course.34. A) It gives students detailed evaluations instead of letter grades.B) It is a private four-year college established in 1967.C) It has a large number of students but no overseas students now.D) It adopts the evaluations written by the professors only.35. A) She thinks they are a good way to evaluate students.B) She doesn’t think they provide good direction for students.C) She thinks they will be replaced by a new evaluation system.D) She thinks they will be changed by the American university system.■Section CDirections: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write down the main points in your own words. Finally, when the passage is read for the third time, you should check what you have written.Many people want to know if there is a state religion in the United States. The answer is no and thereason goes back to the early days of America’s history.In the 17th and 18th centuries, many (36) _______ moved to colonial America in part to (37) _________ religious oppression. Thomas Jefferson and other early American leaders (38) ________ designed a national government that had no (39) ______ religion. They wanted to build a country that included many religions, where citizens were free to follow their own (40) __________.The First Amendment of the Constitution supports religious (41) ________ and places religion outside the reach of the government. This idea is often described as “the (42) ________ of church and state”.How the First Amendment (43) __________ to life in America has often been disputed. There is deep opposition between people (44)_______________________________ ____________________________.The church and state debate is still going on today. For some people, polic ies about stem-cell research, same-sex marriage and abortion rights threaten religious beliefs. (45)___________________________________________.Even though there is no state religion in America, there is a large, beautiful religious center in the nation’s capital called the Cathedral Church of Saint Peter and Saint Paul. But an official says the church calls itself the Washington National Cathedral because (46)_________________________________________________.Part IVReading Comprehension (Reading in Depth)(25 minutes)■Section ADirections: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once.Questions 47 to 56 are based on the following passage.Data from the Chandrayaan-1 (印度“月球初航1号”) spacecraft suggests water is still being formed on its surface. It is believed that the water is 47 at the poles and possibly formed by the solar wind. The finding was made after researchers examined data from three separate 48 to the moon. The reports show that the water may be moving around, forming and reforming as particles become 49 up in the dust on the surface of the moon.Dr. Mylswamy Annadurai, the mission’s project director at the Indian Space Research Organisation in Bangalore, told The Times, “It’s very 50 . This was one of the main objectives of Chandrayaan-1, to find evidence of water on the moon.” The unmanned craft was 51 with NASA’s Moon Mineralogy Mapper (美国航天局设计的月球矿物绘图仪，简称M3), designed 52 to search for water by picking up the electromagnetic radiation sent out by minerals. The M3 was designed to search for water by 53 the electromagnetic radiation given off by different minerals on and just below the surface of the moon. Unlike previous equipment, it was 54 enough to detect the existence of small amounts of water.Carle Pieters of Brown University in Rhode Island and his colleagues 55 data from Chandrayaan-1 and found spectrographic (光谱的) evidence of water. The water seems thicker closer to the poles, they reported. “When we say ‘water on the moon’, we are not talking about lakes or oceans. Water on the moon means molecules of water and hydroxyl (hydrogen and oxygen) that 56 with molecules of rock and dust specifically in the top millimeters of the moon’s surface,” Pieters said in a statement. Scientists said the breakthrough would change the face of lunar exploration.A) specifically I) concentratedB) detecting J) sensitiveC) occasionally K) reviewedD) decisions L) satisfyingE) missions M) dividedF) interact N) equippedG) disappointing O) mixedH) sensible■Section BDirections: There are 2 passages in this section. Each passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice.Passage OneQuestions 57 to 61 are based on the following passage.Feeding 30 million schoolchildren is a difficult task. As a result, many of today’s school cafeteria offerings end up as appealing as a tray of lukewarm airplane food. And if there’s one point of agreement on the state of school lunches, it’s that local school districts and the federal government are over-tasked. The U.S. Department of Agriculture’s National School Lunch Program (NSLP) helps feed millions of American schoolchildren. Critics charge that the program is under-funded and misspends money on meals that are overly processed, too rich in fat and not nutritious. The challenge is how to change this on a national and local level.Help has historically trickled in courtesy of local entrepreneurs and nearby natural-food advocates who supplied some schools with organic and farm-fresh foods. Now, a new campaign supported by national corporations hopes to make more sweeping changes across the country. Whole Foods and a loose coalition of organic-food manufacturers and advocates say that creating a healthier national food policy is the start. Last August, Whole Foods launched a fund-raising campaign to reform the country’s school lunch programs and has so far raised more than $440,000 that will support an online effort to help school districts create healthy and affordable meal options. According to the supermarket chain’s chief operating officer Walter Robb, some of that money will also help raise awareness about the Child Nutrition Act (CAN).CAN determines school food policy and financial resources as well as funds the NSLP. Advocates for healthier lunches say that the Nutrition Act will be reauthorized by the president and Congress. School lunch programs now get $9.3 billion in federal funding, or about $2.68 for each eligible child. Subtract labor and other administrative costs and some child-nutrition advocates estimate that only $1 goes toward food. That’s not enough, said Robb. “It’s a Sisyphean situation. We’re at a tipping point. We need to raise exposure and do something right now.”For Ann Cooper, the former director of nutrition services for California’s Berkley Unified School District, help from either the public or private sector is much needed. Cooper, a chef and author, created , funded b y Whole Foods. The site’s mission is “to help your community transition step by step to a school program that will improve the health and well-being of our children”. It features recipes for schools, information about food safety, and promotes community ac tivism. “I hope we’re building a trend,” Cooper said of her partnership with Whole Foods. “More companies are doing this. Maybe it’s part altruistic, part capitalistic. But if a company can make money feeding kids and make them healthier, that’s the bottomline.”57. From the first paragraph, what can we learn about today’s school cafeteria offerings?A) They are good but not adequate.B) They are not healthy enough.C) They are rich in fat and protein.D) They are the same as those on airplanes.58. The u nderlined word “coalition” in the second paragraph means “_________”.A) a union of two political partiesB) a combination of different partsC) a group of people who join togetherD) a kind of movement59. The money raised by Whole Foods will be primarily used to ____________.A) carry out school food policiesB) make people better aware of CANC) launch a campaign about healthy foodD) help school districts provide better food60. What does the underlined sentence “It’s a Sisyphean situation.” in the th ird paragraph mean?A) A situation that is satisfactory and should be maintained.B) A situation that hasn’t been changed much.C) A situation that is stable and should be improved gradually.D) A situation that is worse than before and cannot be changed.61. Which of the following descriptions of Ann Cooper is correct?A) She is a teacher at the Children’s Nutrition School.B) She has many recipes for delicious food.C) She created a website to help school lunch programs.D) She is a community volunteer helping children.Passage TwoQuestions 62 to 66 are based on the following passage.The UN has declared 2010 the International Year of Biodiversity. In October, scientists and politicians will meet in Japan to assess progress towards the targets under The Convention on Biological Diversity, confirmed at the 2002 Johannesburg summit in South Africa. The bad news is that the chances of meeting those targets are extremely low. Most indicators suggest that the rate of biodiversity loss is increasing, not slowing. It is clear that we need to redouble our efforts.This has to be done in two ways: by improving scientific understanding of what is happening to the world’s biodiversity, and by ensuring that this understanding is conveyed to as wide an audience as pos sible. Both are difficult but essential — and fortunately both are doable.On the first front, we need to know in as much detail as possible what has happened to biodiversity over the recent past (the 300 or so years since the revolutions in industrializat ion and agriculture had a major impact on the world) so we can better measure current rates of biodiversity loss. Only when we have a validated rate of past decline can we assess the effects of conservation efforts.We also need to be creative about where we look for that evidence. Monitoring programs show evidence of changes in one place over a few years or decades, but they are already being made more difficult by theimpact climate change is having on the distribution of organisms — and thus on biodiversity — at any particular place on the planet.When it comes to longer-term changes, monitoring clearly cannot help. This is where scientific collections such as those in natural history museums and herbaria can make a unique contribution. These vast, painstakingly assembled collections of animals and plants are more than mere relics: they offer snapshots of past biodiversity. The collections held in institutions like the Natural History Museum in London can make an important contribution by providing data that will help us all to assess long-term changes in biodiversity.But assessing the changes is clearly not enough on its own. Action to foster biodiversity is urgently needed, and that requires politicians — and thus the wider public — to understand the significance of the changes taking place. This can be a complex message to communicate. The issue is not whether it is worth conserving a charismatic mammal or whether it matters if a few nematodes become extinct: it needs to be far more widely understood that declines in individual species herald the decline of diversity in whole ecosystems, which, in turn, has implications for human survival.62. The conference to be held in Japan aims to _________.A) evaluate whether there has been any progress in protecting biodiversityB) set up targets for biological diversity all over the worldC) increase biodiversity through various efforts in South AfricaD) call people’s attention to the rate of biodiversity loss63. What greatly affected biological diversity over the recent past?A) Climate change.B) Man’s damage to the earth.C) The industrial and agricultural revolutions.D) Scientific research and progress.64. The scientific collections of animals and plants provide _________.A) great relics for visitors to appreciateB) snapshots to show historical eventsC) useful data to understand changes in biodiversityD) rare evidence to prove their previous existence65. Which of the following can best summarize the main idea of the passage?A) The International Year of Biodiversity focuses our attention on the study of biodiversity.B) Scientific ways should be used to slow down the rate of biodiversity loss.C) Changes in biodiversity may endanger the existence of human beings.D) The public should know more about the importance of biodiversity.66. What is implied in the passage?A) More efforts should be made to conserve biodiversity.B) Monitoring programs have proved to be ineffective.C) It is high time that we made efforts to foster biodiversity.D) Building museums is an important way to save biodiversity.Part V Cloze(15 minutes)Directions: There are 20 blanks in the following passage. For each blank there are four choices marked。

杨凌职业技术学院2009-2010学年第二学期课程表

N2-2-13 N2-2-15 施测穆创国 N5305
项目水保*
N2-2-15 N2-2-15 N2-2-15 N2-2-15
质量监控H 监理概论H
N2-2-15 N2-2-15 CAD机房2 N2-2-15
质量监控H 监理概论H*
水建 06504
（五年制）
5 6人
项目水保黄梦琪 N5305 施测穆创国 N5307
总25页，第2页
杨凌职业技术学院2009-2010学年第二学期课程表
课程教师星期节次
星期一
1-2
英语王英 N5311 工力周磊 N5309 英语H* 谭海燕 BH1
星期二
7-8
晚自习
星期三
7-8
晚自习
星期四
7-8
晚自习
星期五
7-8
晚自习
星期六
7-8
晚自习
星期日
7-8 1-2 3-4 5-6 7-8
电气设备H
N2-2-19 N2-2-19 N2-2-19 水泵站李敏科
水利经济# 地基处理*
N2-2-19 N2-2-19 N2-2-19 水工芦琴水利经济电气设备H 樊慧芳郭英芳 NH5
电气设备H
给排水陈亚萍
水工芦琴
刘萍 NH3
郭英芳 NH6
电气设备H
N2-2-20 N2-2-20 工程 08026 水工芦琴水泵站李敏科
施工朱显鸽
N2-3-19 N2-2-13 工程 08024 灌排樊慧芳水工芦琴
N2-3-19 N2-3-19
N2-3-19 N2-3-19 N2-3-13 N2-3-19 给排水田佳灌排樊慧芳水工芦琴

山西省太原五中09-10学年高二下学期4月月考(数学文)

太原五中2009—2010年学年度第二学期月考(4月)高二数学(文)一、选择题。

1．推理 “○1矩形是平行四边形;○2正方形是矩形;○3所以正方形是平行四边形”中的小前提是( )(A) ○1 (B) ○2 (C) ○3 (D) ○1和○22．设)0,(,,-∞∈c b a ,则ac c b b a 1,1,1+++(A)都不大于2- (B)都不小于-2(C)至少有一个不大于-2 (D) 至少有一个不小于-2 3．已知x 与y 之间的一组数据:则y 与x 的线性回归方程a bx y +=必过点( ) (A) (2 ,2)(B) (1.5, 0) (C) (1, 2)(D)(1.5, 4)4．某程序框图如右图所示，该程序运行后输出的k 的值是（）A ．4B ．5C ．6D ．7 5．复数()i a a a )12(22--+-->1,()R a ∈,则a 的取值情况是( )(A)a >2或1-<a (B)3=a (C) 1=a 或3=a (D)21<<-a6．关于x 的03)12(2=-+--i m x i x 方程有实根,则实数m 的值是( ) (A) 41-≥m (B) 41-≤m (C) 121=m (D) 121-=m7．把正整数按下图所示的规律排序,则从2009到2011的箭头方向依次为( )21→ 56→ 910→↓ ↑ ↓ ↑ ↓ … 3 4→ 78→ 11（A ）→↓2010 （B ）↑→2010（C ） ↑2010→ （D ）2010→↓8．已知三角形的三边长分别为a ,b ,c ,内切圆的半径为r ;则三角形的面积为r c b a S )(21++=;四面体的四个面的面积分别为4321,,,S S S S ,内切球的半径为R .类比三角形的面积可得四面体的体积为( )(A) (21=V )4321S S S S +++R (B) (31=V )4321S S S S +++R (C) (41=V )4321S S S S +++R (D) (=V )4321S S S S +++R9．为了判断高中三年级学生选修文科是否与性别有关,现随机抽取50名学生,得到数据如下表:已知.025.0)024.5(,05.0)841.3(22≈≥≈≥K P K P .根据表中数据,得到844.430202723)7102013(5022≈⨯⨯⨯⨯-⨯⨯=K , 则认为选修文科与性别有关系出错的可能性是( )(A) 2.5% (B) 5 % (C) 小于2.5% (D) 大于5%.10．如果复数z 满足,2=-++i z i z ,那么1++i z 的最大值为（）(A) 1 (B) 25(C) 2 (D) 5二、填空。

福建省福州市2010-2011学年度第二学期期末高一模块考试试卷(数学4)

福建省福州市2010-2011学年度第二学期期末高一模块考试试卷（数学必修4)（完卷时间：120分钟:满分：150分)一、选择题（本大题目共12题,每小题5分，共60分,在每小题给出的四个选项中，只有一项是符合题目要求的。

） 1．下列各项中，与sin(—3310）最接近的数是A ．23-B ．21-C ．21D ．232．已知54sin =α,α是第二象限角，那么tan α的值等于A ．34-B ．43-C ．43D ．343．已知下列各式：①CA BC ++AB ； ②OM BO MB +++AB③CD BD AC -+-AB ④CO BO OC +++OA 其中结果为零向量的个数为A ．1B ．2C ．3D ．44．下列函数中，在区间(0，2π)上为增函数且以π为周期的函数是A ．2sin xy = B ．x y sin = C ．x y tan -= D ．x y 2cos -=5．如图1e ，2eA ．-13e 22e B ．--13e 32e C ．+13e 22e D ．+12e 32e6．将函数y=sinx 图象上所有的点向左平移3π个单位长度，再将图象上所有的点的横坐标伸长到原来的2倍（纵坐标不变)，则所得图象的函数解析式为A ．）（32sin π+=x y B ．）（62sin π+=x y C ．）（32sin π+=x y D ．）（32sin π-=x y7．下列四个命题中可能成立的一个是A ．21sin =α，且21cos =α B ．0sin =α，且1cos -=αC ．1tan =α，且1cos -=αD ．α是第二象限角时，αααcos sin tan -=8。

函数)sin(ϕω+=x A y 在一个周期内的图象如下图所示,此函数的解析式为A ．）（322sin 2π+=x y B ．）（32sin π+=x y C ．）（32sin π-=x yD ．）（654sin 2π+=x y 9.已知53)tan(=+βα，41)3tan(=-πβ，那么)3tan(πα+的值为A ．183B ．2313C ．237D ．17710．函数f （x)=sinx 在区间[a ，b ］上是增函数,且f （a)=—1，f (b ）=1,则sin 2ba +的值为A ．1B ．22 C ．—1 D ．011．已知向量a=(-x ，1)，b=(x ,t x ),若函数f （x ）=ba ⋅在区间［-1，1］上不是单调函数，则实数t 的取值范围是A ．（-∞，-2]∪［ 2，+ ∞)B ．（-∞，—2）∪(2，+ ∞)C ．（—2，2)D ．[—2，2］12．已知函数y= f （x)的图象如图甲，则x x f y sin )(-=π在区间［0，π］二、填空题（本大题目共4题,每小题4分，共16分）13．设一扇形的弧长为4cm ，面积为4cm 2，则这个扇形的圆心角的弧度数是 .甲14．000167cos 43sin 77cos 43cos +的值为。

北京四中2010～2011学年度第二学期开学测试初三数学试卷及答案

北京四中2010～2011学年度第二学期开学测试初三数学试卷及答案（考试时间120分钟试卷满分120分）一．选择题（每题4分共32分）1．Rt△ABC中，∠ACB=90°，∠A=30°，CD⊥AB于点D.则△BCD与△ABC的周长之比为（）A．1︰2 B．1︰3 C．1︰4 D．1︰52．在平面直角坐标系XOY中，A点坐标为，将OA绕原点O逆时针旋转900得到，则点的坐标是（）A．B．C．D．3．(18届江苏初三)如图，⊙C过原点，与轴、y轴分别交于A、D两点．已知∠OBA=30°，点D的坐标为（0，2），则⊙C半径是（）A．B．C．D．24. 下列说法正确的个数有（）（1）如图（a），可以利用刻度尺和三角板测量圆形工件的直径；（2）如图（b），可以利用直角曲尺检查工件是否为半圆形；（3）如图（c），两次使用丁字尺（CD所在直线垂直平分线段AB）可以找到圆形工件的圆心；（4）如图（d），测倾器零刻度线和铅垂线的夹角，就是从点看点时仰角的度数．A．1个B．2个C．3个D．4个5．已知关于x的一元二次方程有两个正整数根，则m的值为( ).A．B．C．－4，－5 D. 4， 56．方程的实数根的个数是（）.A．0 B．1C．2 D．37. 如图，抛物线与x轴交于点A、B，与y轴交于点C，若，则b的值为（）A. B. C. D.8．已知抛物线满足：（1）；（2）；（3）与x 轴有2个交点，且两交点间的距离小于2；则以下结论不正确的是( )．A． B. C. D.二．填空题（每题4分共16分）9．已知关于x的方程有两个实数根, 则n的取值范围________．10．在△ABC中，若，则∠A+∠B=__________.11. ⊙O中，弦AB是内接正三角形的一边，弦AC是内接正六边形的一边，则∠BAC ＝__________12．已知抛物线过点A（－2，－1），B（1，2）,对于任何非0的实数a，抛物线都不过点P（m，m2＋1），则m的值是______.三．解答题：（13-18每题5分，19、21、22题6分，20题7分，23题9分，24题8分）13．计算：．14．已知关于x的一元二次方程有两个相等的实数根，求的值。

北京四中2010-2011学年度初二年级第二学期4月统测数学试卷及答案

北京四中2010-2011学年度初二年级第二学期4月统测数学试卷（90分钟）2011.4一、选择题1．如图，正方形ABCD 中，AE 垂直于BE ，且AE =3，BE =4，则阴影部分的面积是（） A ．16 B ．18C ．19D ．212．在根式6.1，z y x 2)(+，b a 2，x 1，2x ，x y ，22y x +，ab 8，3x 中，最简二次根式的个数为（）． A ．2 B ．3 C ．4 D ．5 3．已知反比例函数1y x =的图象经过点P （m ，n ），则化简11m n m n ⎛⎫⎛⎫-+ ⎪⎪⎝⎭⎝⎭的结果正确的是（） A ．2m 2B ．2n 2C ．n 2-m 2D ．m 2-n 24．设A(1x ，1y )、B(2x ，2y )是反比例函数y=22k x--图象上的任意两点，且y 1<y 2 ，则x 1 ，x 2可能满足的关系是( )A ．120x x >>B ．120x x <<C ．210x x <<D ．210x x << 5．在下列说法中错误的是（）A ．在△ABC 中，∠C ＝∠A -∠B ，则△ABC 为直角三角形．B ．在△ABC 中，若∠A ：∠B ：∠C ＝5：2：3，则△ABC 为直角三角形． C ．在△ABC 中，若a ＝53c ，b ＝54c ，则△ABC 为直角三角形．D ．在△ABC 中，若a ：b ：c ＝2：2：4，则△ABC 为直角三角形． 6．如图，在单位正方形组成的网格图中标有AB 、CD 、EF 、GH四条线段，其中能构成一个直角三角形三边的线段是（） A ．CD 、EF 、GH B ．AB 、EF 、GHC ．AB 、CD 、GHD ．AB 、CD 、EF7．图为2002年8 月北京第24届国际数学家大会会标，由4 个全等的直角三角形拼合而成．若图中大小正方形面积分别是6221和4，则直角三角形的两条直角边长分别为（） A ．6，4B ．621，4 C ．621，421 D ．6，421 8．五根小木棒，其长度分别为7，15，20，24，25，现将他们摆成两个直角三角形，其中正确的是（）A ．B ．C ．D ．9．如图△ABC 中，∠C＝90°，AD 平分∠BAC，DE⊥AB 于E ，下面等式错误的是（） A ．AC 2+DC 2=AD 2B ．AD 2－DE 2＝AE 2C ．AD 2=DE 2+AC 2D ．BD 2－BE 2＝41BC 210．若直角三角形两条直角边的长分别为7和24，在这个三角形内有一点P 到各边距离相等，则这个距离是（） A ．4B ．3C ．2D ．1二、填空题11．如图，1l 是反比例函数ky x=在第一象限内的图象，且过点2(21)A l ，，与1l 关于x 轴对称，那么图象2l 的函数解析式为（0x >）．12．已知最简二次根式与是同类二次根式，则a b +的值为．13．化简： 332||m m m ++＝ ()0m <；＝． 14．反比例函数y=kx中，当x 的值由4增加到6时，y 的值减小3，则这个反比例函数的解2析式为_________________.15．,x y 为实数，且3y ，化简：3y -16．如图，一个机器人从A 点出发，拐了几个直角的弯后到达B 点位置，根据图中的数据，点A 和点B 的直线距离是． 17. △ABC 中，∠A ＝45°，∠C＝120°，BC=2，则AC=________.18．有两根木条，长分别为6和8，现再截一根木条做一个钝角三角形，则第三根木条x 长度的取值范围 .三、解答题 19．计算：（1）)272(43)32(21--+；（2）222x x x x --；（3）；（42(2(7+；20．（1）已知3,1a b ab +=-=，求ab b a +的值．（2）已知2310x x -+=21．已知25+的整数部分为a ，小数部分为b ，求2222444bab a b a ++-的值．22．在所给的9×9方格中，每个小正方形的边长都是1．按要求画平行四边形，使它的四个顶点以及对角线交点都在方格的顶点上．(1)在图甲中画一个平行四边形，使它的周长是整数； (2)在图乙中画一个平行四边形，使它的周长不是整数．甲乙23．如图，在△ABC 中，∠BAC ＝120°，∠B ＝30°，AD ⊥AB ，垂足为A ，CD ＝1c m ，求AB 的长．24．如图，直线AB 与双曲线的一个交点为点C ，CD x ⊥轴与点D ，OD=2OB=4OA=4．求一次函数和反比例函数的解析式．25. 在△ABC 中，AB=AC ，D 是BC 延长线上的点，求证：DC BD AB AD ⋅=-22．26.（1）探究新知：如图1，已知△ABC 与△ABD 的面积相等，直接写出AB 与CD 的位置关系: ________________．（2）结论应用：①如图2，点M ，N 在反比例函数xky =（k ＞0）的图象上，过点M 作ME ⊥y 轴于点E ，过点N 作NF ⊥x 轴于点F ，垂足分别为E ，F ．试证明：MN//EF ．A BDC图 1②若①中的其他条件不变，只改变点M ，N 的位置如图3所示，请判断 MN 与EF 是否平行，并说明理由.27．已知：在Rt△ABC 中，∠C ＝90°，∠A 、∠B 、∠C 的对边分别为a 、b 、c ，设△ABC 的面积为S ，周长为l ．（1）填表：（2）如果a ＋b －c ＝m ，观察上表猜想：l(用含有m 的代数式表示)．（3）证明（2）中的结论．图 3四、附加题:“三等分角”是数学史上一个著名问题，但仅用尺规不可能“三等分角” ．下面是数学家帕普斯借助函数给出的一种“三等分锐角”的方法（如图），将给定的锐角∠AOB置于直角坐标系中，边OB在x轴上、边OA与函数1yx=的图象交于点P，以P为圆心，以2OP为半径作弧交图象于点R．分别过点P和R作x轴和y轴的平行线，两直线相交于点M，连接OM得到∠MOB，则13MOB AOB∠=∠．要明白帕普斯的方法，请你研究以下问题：（1）设1(,)P aa、1(,)R bb，求直线OM相对应的函数解析式（用含a，b的代数式表示）．（2）分别过P和R作y轴和x轴的平行线，两直线相交于点Q，请说明Q点在直线OM上，据此证明13MOB AOB ∠=∠．参考答案: 一、选择 CBDCD BCCDB 二、填空 11、2y x =-； 12、 2； 13、 – m ； 14、36y x=； 15、-1；16、10； 171； 18、1014x <<或2x <<三、解答题19、（1 （2 （3）12-+ （4）120、（1）3；（221122、答案不唯一，如：2324、141,2y x y x=--=- 25、作AM ⊥BC 于M ，Rt △ADM 中222AD AM MD =+ ， Rt △ADM 中222AB AM MB=+2222()()AD AB MD BM MD BM MD BM BD CD ∴-=-=+-=⋅26、（1）AB//CD （2）设M(m,k m )，N(n ，k n )，则E(0，km)，F(n ，0)所以 22EMF m k k S m =⋅=△，22ENF n k k S n =⋅=△ 所以 MN//EF. 第二问同上。

辽宁大学2009-2010学年第二学期期末考试安排表(公共课部分)

2111024 39 2111024 40 2111024 41 2111024 42
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大学英语(二) 大学英语(二)
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大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二) 大学英语(二)
考试时间考试地点
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监考单位文学院文学院文学院文学院文学院文学院文学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院经济学院商学院商学院商学院商学院商学院商学院商学院商学院商学院商学院历史学院历史学院
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蒲河校区白丽君 2111044 47 蒲河校区白丽君 2111044 48 蒲河校区王佳音 2111044 49 蒲河校区王佳音 2111044 50 蒲河校区付筱娜 2111044 51 蒲河校区付筱娜 2111044 52 蒲河校区蒲河校区蒲河校区赵娟赵娟赵娟
2111024 31 2111024 32 2111024 32
54 55 55 50 49 56 55 23 50 48
1-54 7月5日上午博雅楼101 1-55 7月5日上午博雅楼107

2010全国卷数学 (4)

2010全国卷数学IntroductionThe 2010 National Mathematics Examination in China was a significant event for students across the country. This examination was designed to evaluate students’ mathematical knowledge and problem-solving skills. In this article, we will explore the main topics covered in the 2010 National Mathematics Examination and discuss the importance of this examination in shaping the education system in China.BackgroundThe National Mathematics Examination is an annual event conducted by the Chinese Ministry of Education. It aims to assess the mathematical abilities of high school students throughout the country. The examination consists of multiple-choice questions and problem-solving tasks, covering various mathematical concepts and topics.Structure of the ExaminationThe 2010 National Mathematics Examination was divided into two sections: Section A and Section B. Section A consisted of 15 multiple-choice questions, while Section B included 10 problem-solving tasks.Section A - Multiple Choice QuestionsThe multiple-choice questions tested students’ understanding of fundamental mathematical concepts and their ability to apply these concepts to solve problems.The questions covered topics such as algebra, geometry, trigonometry, and calculus. Each question had four options, and students had to choose the correct answer.Section B - Problem Solving TasksSection B involved problem-solving tasks that required students to apply their mathematical skills and knowledge in real-world scenarios. These tasks were designed to assess students’ ability to reason logically, solve complex problems, and communicate their solutions effectively. The tasks encompassed various mathematical topics such as number theory, geometry, statistics, and probability.Importance of the 2010 National Mathematics ExaminationThe 2010 National Mathematics Examination played a crucial role in the Chinese education system for several reasons:Evaluation of Mathematical CompetencyThis examination served as an effective tool to eva luate students’ mathematical competency. By testing a wide range of mathematical concepts and problem-solving abilities, the examination provided an accurate measure of students’ mathematical skills. The results of the examination helped identify students’ strengths and weaknesses in mathematics, enabling educators to tailor their teaching methods accordingly.Benchmark for Curriculum DevelopmentThe National Mathematics Examination served as a benchmark for curriculum development in China. The examination papers were designed based on the mathematics curriculum taught in high schools across the country. By analyzing the performance of students in the examination, education policymakers were able toidentify areas that needed improvement in the curriculum. This feedback was vital for shaping future curriculum standards and enhancing the quality of mathematics education in China.Preparation for College Entrance ExaminationsThe 2010 National Mathematics Examination provided valuable preparation for college entrance examinations. In China, the college entrance examination, known as the Gaokao, is a crucial event for students aspiring to pursue higher education. Mathematics is a significant component of the Gaokao examination, and students’ performance in the National Mathematics Examination can significantly impact their chances of scoring well in the Gaokao. Thus, the examination served as a stepping stone for students to achieve their academic goals.ConclusionThe 2010 National Mathematics Examination in China was a significant event that evaluated students’ mathematical knowledge and problem-solving skills. The examination served as an effective tool for evaluating mathematical competency, benchmarking curriculum development, and preparing students for college entrance examinations. By analyzing the results of the examination, educators and policymakers were able to identify areas of improvement in mathematics education and develop strategies to enhance students’ mathematical abilities. The National Mathematics Examination played a crucial role in shaping the education system in China and promoting excellence in mathematics education.。