20110611_102948_二册3-4单元测试

一、选择题1．某赛季甲、乙两名篮球运动员每场比赛得分用茎叶图表示，茎叶图中甲得分的部分数据被墨迹污损不清（如图1），但甲得分的折线图完好（如图2），则下列结论错误的是（ ）A ．乙运动员得分的中位数是17，甲运动员得分的极差是19B ．甲运动员发挥的稳定性比乙运动员发挥的稳定性差C ．甲运动员得分有12的叶集中在茎1上 D ．甲运动员得分的平均值一定比乙运动员得分的平均值低2．在发生某公共卫生事件期间，有专业机构认为该事件在一段时间内没有发生大规模群体感染的标志是“连续10日，每天新增疑似病例不超过7人”.过去10日，甲、乙、丙、丁四地新增疑似病例数据信息如下： 甲地：总体平均数为3，中位数为4； 乙地：总体平均数为1，总体方差大于0； 丙地：总体平均数为2，总体方差为3； 丁地：中位数为2，众数为3；则甲、乙、两、丁四地中，一定没有发生大规模群体感染的是（ ） A ．甲地B ．乙地C ．丙地D ．丁地3．一组数123,,,,n x x x x 平均数是x ，方差是2s ，则另一组数1232,32x x ++，332,,32n x x ++的平均数和方差分别是（ ）A ．23,x sB ．232,3x s +C ．232,x s +D ．232,3262x s s +++4．一位学生在计算20个数据的平均数时，错把68输成86，那么由此求出的平均数与实际平均数的差为 A ．B ．C ．D ．5．某单位青年、中年、老年职员的人数之比为10∶8∶7，从中抽取200名职员作为样本，若每人被抽取的概率是0.2，则该单位青年职员的人数为( ) A ．280B ．320C ．400D ．10006．为参加CCTV 举办的中国汉字听写大赛，某中学举行了一次大型选拔活动，随机统计了甲、乙两班各6名学生的汉字听写的成绩如图所示，设甲、乙两班数据的平均数依次为1x ，2x ，标准差依次为s 1，s 2，则 ( )A ．12x x >，s 1>s 2B ．12x x >，s 1<s 2C ．12x x =，s 1>s 2D ．12x x =，s 1<s 27．我国古代数学算经史书之一的《九章算术》有一衰分问题：今有北乡八千一百人，西乡七千四百八十八人，南乡六千九百一十二人，凡三乡，发役三百人，则北乡遣（ ） A ．104人 B ．108人C ．112人D ．120人8．已知某市20132019-年全社会固定资产投资以及增长率如图所示，则下列说法错误．．的是（ ）A ．从2013年到2019年全社会固定资产的投资处于不断增长的状态B ．从2013年到2019年全社会固定资产投资的平均值为713.6亿元C ．该市全社会固定资产投资增长率最高的年份为2014年D ．2016年到2017年全社会固定资产的增长率为09．某小区为了调查本小区业主对物业服务满意度的真实情况，对本小区业主进行了调查，调查中问了两个问题1：你的手机尾号是不是奇数？问题2：你是否满意物业的服务？调查者设计了一个随机化装置，其中装有大小、形状和质量完全相同的白球和红球，每个被调查者随机从装置中摸到红球和白球的可能性相同，其中摸到白球的业主回答第一个问题，摸到红球的业主回答第二个问题，回答“是”的人往一个盒子中放一个小石子，回答“否”的人什么都不要做由于问题的答案只有“是”和“否”，而且回答的是哪个问题别人并不知道，因此被调查者可以毫无顾虑地给出符合实际情况的答案.已知某小区80名业主参加了问卷，且有47名业主回答了“是”，由此估计本小区对物业服务满意的百分比大约为（ ）A ．85%B ．75%C ．63.5%D ．67.5%10．某小学共有学生2000人，其中一至六年级的学生人数分别为400,400,400,300，300,200.为做好小学放学后“快乐30分”活动，现采用分层抽样的方法从中抽取容量为200的样本进行调查，那么应抽取一年级学生的人数为（ ） A ．120B ．40C ．30D ．2011．统计某校n 名学生的某次数学同步练习成绩（满分150分），根据成绩分数分成六组：[)90,100，[)100,110，[)110,120，[)120130,，[)130140,，[]140,150，绘制频率分布直方图如图所示，若已知不低于140分的人数为110，则n 的值是（ ）A ．800B ．900C ．1200D ．100012．甲、乙两名同学在5次数学考试中，成绩统计图用茎叶图表示如图所示，若甲、乙两人的平均成绩分别用x 甲、x 乙表示，则下列结论正确的是( )A ．x x >甲乙，且甲比乙成绩稳定B ．x x >甲乙，且乙比甲成绩稳定C ．x x <甲乙，且甲比乙成绩稳定D ．x x <甲乙，且乙比甲成绩稳定13．我国古代数学名著《九章算术》中有如下问题:“今有北乡8758人，西乡有7236人，南乡有8356人，现要按人数多少从三个乡共征集487人，问从各乡征集多少人”.在上述问题中，需从南乡征集的人数大约是（ ） A ．112B ．128C ．145D ．167二、解答题14．某市有100万居民，政府为了了解居民用水情况，通过抽样，获得了某年100位居民每人的月均用水量(单位：吨)，将数据按照[0,0.5),[0.5,1),,[4,4.5)分成9组，制成了如下的频率分布直方图：（1）求直方图中a 的值；（2）估计居民月均用水量的众数、中位数（精确到0.01）．15．随机观测生产某种零件的某工厂25名工人的日加工零件数（单位：件），获得数据如下：30、42、41、36、44、40、37、37、25、45、29、43、31、36、49、34、33、43、38、42、32、34、46、39、36，根据上述数据得到样本的频率分布表如下：分组频数 频率[]25,3030.12(]30,3550.20(]35,4080.32(]40,451n1f(]45,502n2f（1）确定样本频率分布表中1n 、2n 、1f 和2f 的值； （2）根据上述频率分布表，画出样本频率分布直方图；（3）根据样本频率分布直方图，求在该厂任取4人，至少有1人的日加工零件数落在区间(]30,35的概率.16．某单位开展岗前培训期间，甲、乙2人参加了5次考试，成绩统计如下：第一次 第二次 第三次 第四次 第五次 甲的成绩 82 82 79 95 87 乙的成绩9575809085（1）根据有关统计知识回答问题：若从甲、乙2人中选出1人上岗，你认为选谁合适？请说明理由；（2）根据有关概率知识解答以下问题：若一次考试两人成绩之差的绝对值不超过3分，则称该次考试两人“水平相当”.由上述5次成绩统计，任意抽查两次考试，求至少有一次考试两人“水平相当”的概率.17．某高校共有学生15000人，其中男生10500人，女生4500人.为调查该校学生每周平均体育运动时间的情况，采用分层抽样的方法，收集300位学生每周平均体育运动时间的样本数据（单位：小时）.（1）应收集多少位女生的样本数据？（2）根据这300个样本数据，得到学生每周平均体育运动时间的频率分布直方图（如图所示），其中样本数据的分组区间为：[]0,2，(]2,4，(]4,6，(]6,8，(]8,10，(]10,12.估计该校学生每周平均体育运动时间超过4小时的概率.（3）在样本数据中，有60位女生的每周平均体育运动时间超过4小时，请完成每周平均体育运动时间与性别列联表，并判断是否有95%的把握认为“该校学生的每周平均体育运动时间与性别有关”.()20P K k ≥0.10 0.05 0.010 0.005 0k2.7063.8416.6357.879附：()()()()()22n ad bc K a b c d a c b d -=++++. 18．对某校高三年级学生参加社区服务次数进行统计，随机抽取M 名学生作为样本，得到这M 名学生参加社区服务的次数.根据此数据作出了频数与频率统计表和频率分布直方图如下：分组 频数 频率 [)10,1515 0.30[)15,2029n[)20,25 mp[)25,302t合计M1（1）求出表中M ，p 及图中a 的值；（2）若该校高三学生人数有500人，试估计该校高三学生参加社区服务的次数在区间[)10,15内的人数；（3）在所取样本中，从参加社区服务的次数不少于20次的学生中任选2人，求至多一人参加社区服务次数在区间[)25,30内的概率．19．某中学团委组织了“纪念抗日战争胜利73周年”的知识竞赛，从参加竞赛的学生中抽出60名学生，将其成绩（均为整数）分成六段[)40,50，[)50,60，…，[]90,100后，画出如图所示的部分频率分布直方图.观察图形给出的信息，回答下列问题：（1）求第四组的频率，并补全这个频率分布直方图；（2）估计这次竞赛的及格率（60分及以上为及格）和平均分（同一组中的数据用该组区间的中点值代表）20．每年的12月4日为我国“法制宣传日”.天津市某高中团委在2019年12月4日开展了以“学法、遵法、守法”为主题的学习活动.已知该学校高一、高二、高三的学生人数分别是480人、360人、360人.为检查该学校组织学生学习的效果，现采用分层抽样的方法从该校全体学生中选取10名学生进行问卷测试.具体要求：每位被选中的学生要从10个有关法律、法规的问题中随机抽出4个问题进行作答，所抽取的4个问题全部答对的学生将在全校给予表彰.⑴求各个年级应选取的学生人数；⑵若从被选取的10名学生中任选3人，求这3名学生分别来自三个年级的概率；⑶若被选取的10人中的某学生能答对10道题中的7道题，另外3道题回答不对，记X表示该名学生答对问题的个数，求随机变量X的分布列及数学期望.21．对某校高一年级学生参加社区服务次数进行统计，随机抽取M名学生作为样本，得到这M名学生参加社区服务的次数．根据此数据作出了频数与频率的统计表和频率分布直方图如下：分组频数频率[10，15）100.25[15，20）25n[20，25）m p[25，30）20.05合计M1（1）求出表中M，p及图中a的值；（2）若该校高一学生有360人，试估计该校高一学生参加社区服务的次数在区间[15，20）内的人数；（3）在所取样本中，从参加社区服务的次数不少于20次的学生中任选2人，请列举出所有基本事件，并求至多1人参加社区服务次数在区间[20，25）内的概率．22．我校对高二600名学生进行了一次知识测试,并从中抽取了部分学生的成绩(满分100分)作为样本,绘制了下面尚未完成的频率分布表和频率分布直方图.(1)填写频率分布表中的空格,补全频率分布直方图,并标出每个小矩形对应的纵轴数据; 分组 频数 频率 [50,60) 2 0.04 [60,70) 8 0.16[70,80) 10[80,90)[90,100] 140.28 合计1.00如果用分层抽样的方法从样本分数在[60,70)和[80,90)的人中共抽取6人,再从6人中选2人,求2人分数都在[80,90)的概率.23．为了调查某中学学生在周日上网的时间，随机对名男生和名女生进行了不记名的问卷调查,得到了如下的统计结果： 表1：男、女生上网时间与频数分布表 上网时间（分钟） [30,40） [40,50） [50,60） [60,70） [70,80] 男生人数 5 25 30 25 15 女生人数1020402010（Ⅱ）完成下表，并回答能否有90%的把握认为“学生周日上网时间与性别有关”？上网时间少于60分钟 上网时间不少于60分钟 合计男生女生 合计附：公式2()()()()()n ad bc k a b c d a c b d -=++++，其中20()P k k ≥ 0.500.40 0.25 0.15 0.10 0.05 0.025 0.010 0.005 0.0010k0.455 0.708 1.323 2.072 2.706 3.84 5.024 6.635 7.879 10.8324．已知某单位甲、乙、丙三个部门的员工人数分别为24，16，16.现采用分层抽样的方法从中抽取7人，进行睡眠时间的调查.（I ）应从甲、乙、丙三个部门的员工中分别抽取多少人？（II ）若抽出的7人中有4人睡眠不足，3人睡眠充足，现从这7人中随机抽取3人做进一步的身体检查.（i ）用X 表示抽取的3人中睡眠不足．．的员工人数，求随机变量X 的分布列与数学期望； （ii ）设A 为事件“抽取的3人中，既有睡眠充足的员工，也有睡眠不足的员工”，求事件A 发生的概率.25．节能减排以来，兰州市100户居民的月平均用电量(单位：度)，以[)[)[)[)[)[)[]160180180200200220220240240260260280280300，，，，，，，，，，，，，分组的频率分布直方图如图．()1求直方图中x 的值；()2求月平均用电量的众数和中位数；()3估计用电量落在[)220300，中的概率是多少？ 26．某研究院为了调查学生的身体发育情况，从某校随机抽频率组距测120名学生检测他们的身高（单位：米），按数据分成[1.2,1.3],(1.3,1.4],,(1.7,1.8]这6组，得到如图所示的频率分布直方图，其中身高大于或等于1.59米的学生有20人，其身高分别为1.59，1.59，1.61，1.61，1.62，1.63，1.63，1.64，1.65，1.65，1.65，1.65，1.66，1.67，， 1.68，1.69，1.69，1.71，1.72，1.74，以这120名学生身高在各组的身高的频率估计整个学校的学生在各组身高的概率．（1）求该校学生身高大于1.60米的频率，并求频率分布直方图中m 、n 、t 的值； （2）若从该校中随机选取3名学生（学生数量足够大），记X 为抽取学生的身高在(1.4,1.6]的人数求X 的分布列和数学期望．【参考答案】***试卷处理标记，请不要删除一、选择题 1．D 解析：D 【分析】先根据甲得分的折线图确定被墨迹污损的两个数字取值范围，再根据极差、平均数、中位数等概念以及茎叶图判断大小以及稳定性,即可作出判断选择. 【详解】由茎叶图得乙运动员得分的中位数是17，平均值为9+14+15+17+18+19+20=148根据甲得分的折线图确定被墨迹污损的两个数字取值范围为[13,15]，所以甲运动员得分的极差是28919-=，甲运动员得分有41=82的叶集中在茎1上，甲运动员得分数据比乙分散，所以甲发挥的稳定性比乙运动员发挥的稳定性差，甲运动员得分平均值9+12+13+13+13+20+26+28>>148x 甲，所以D 错误，故选：D 【点睛】本题考查茎叶图、折线图及其应用，考查基本分析判断计算能力，属基础题.2．C解析：C【分析】平均数与中位数,不能限制极端值的出现,因而可能会出现超过7人的情况;方差体现的是数据的离散情况,不知道方差的具体值,不能判断是否出现超过7人的情况;众数是出现次数多的数据,不能限制极端值的大小. 【详解】对于甲地, 总体平均数为3,中位数为4.平均数与中位数,不能限制极端值的出现,因而可能会出现超过7人的情况,所以甲地不符合要求;对于乙地, 总体平均数为1,总体方差大于0.没有给出方差具体的大小,如果方差很大,有可能出现超过7人的情况,所以乙地不符合要求;对于丁地：中位数为2,众数为3. 中位数与众数不能限制极端值的大小,因而可能出现超过7人的情况,所以丁地不符合要求; 对于丙地,根据方差公式()()()2222123110s x x x x x x ⎡⎤=-+-+-+⋅⋅⋅⎢⎥⎣⎦.若出现大于7的数值m ,则()()()22222312 3.610s m x x x x ⎡⎤=-+-+-+⋅⋅⋅>⎢⎥⎣⎦,与总体方差为3矛盾,因而不会出现超过7人的情况出现. 综上可知,丙地符合要求. 故选:C 【点睛】本题考查了平均数、众数、中位数与方差表示数据的特征,对数据整体进行估算,属于中档题.3．B解析：B 【分析】直接利用公式：i x 平均值方差为2,x s ，则ax b +的平均值和方差为：22,ax b a s +得到答案. 【详解】123,,,,n x x x x 平均数是x ，方差是2s123,3n x方差为：2223s s = 故答案选B 【点睛】本题考查了平均数和方差的计算：123,,,,n x x x x 平均数是x ，方差是2s ，则ax b +的平均值和方差为：22,ax b a s +.4．B解析：B 【解析】 【分析】应用平均数计算方法，设出两个平均数表达式，相减，即可。

物理 电功率 单元检测试题 A卷一、选择题：1、一度电可以：（ ）A.使80 W 的电视机正常工作25 hB.使40 W 的日光灯正常工作60 h C ．使100 W 的电烙铁正常工作10 h D.使1000 W 的电饭锅正常工作10 h 2、两条电阻丝串联在电路中，在相同的时间内产生热量最多的是（ ）A.通过电流较大的电阻丝B.电压较小的电阻丝 C ．电阻较大的电阻丝 D.电阻较小的电阻丝3、小红家的电表允许通过的最大电流是10A ，她家有4个标有“220V，60W”的灯泡，1个标“220V， 1000W”的热水器1台，制冷时耗电140W 的电冰箱和一台耗电80W 的电视机，则（ ）A. 所有用电器可以同时使用B. 除热水器外其他用电器可以同时使用C. 关闭电视机后其他用电器可以同时使用D. 电冰箱制冷时，其他用电器不能同时使用 4、如图1所示的电路，当变阻器的滑片P 向b 移动过程中（ ）A. 灯L 功率变大，电流表Ａ电压表Ｖ 的示数都变小B. 灯L 功率变大，电流表Ａ 的示数变小电压表 Ｖ的示数变大C. 灯L 功率变小，电流表 Ａ电压表Ｖ示数都变大D. 灯L 功率变小，电流表Ａ 的示数变小，电压表Ｖ 示数变大 5、如图2，对于电能表面板上的一些参数的理解，下列说法错误的是：（ ）Ａ．此时电能表的读数为120.7度Ｂ．“220V ”是指这个电能表应该在220伏的电路中使用Ｃ．“10(20)A ”是指这个电能表使用时正常工作电流为10安或20安Ｄ．“600revs ／kW ·h ”是指用电器每消耗1千瓦时电能，电能表的转盘转过600转6、小灯泡额定电压为6V ，额定功率估计在7W ～l2W 之间，小佳按如下图3所示甲的电路测定灯的功率，所用电流表有0.6A 、3A 两档，电压表有3V 、l5V 两档，将它们连入电路时小佳作了正确选择与操作，变阻器滑到某处时两电表示数如图的乙、丙所示，则（ ）A ．小灯泡额定功率为7.5WB ．在5V 时小灯泡的功率为7.5WC ．在1V 电压下小灯泡功率7.5WD ．在5V 时小灯泡功率为1.5W 7、下列四幅图中，符合安全用电的是（ ）A.在电线上晾衣服B ．湿手开灯C.手摸火线 D．用电器金属外壳接图2 图1 图38、灾后重建，小宇同学家的永久性住房已经建好。

人教版数学三年级下册第四单元基础卷1一、趣味填空。

1.一个三位数，百位上是4，十位上是0，个位上是2，它的5倍是（ ）。

2.32×60的末尾有（ ）个0，54×50的末尾有（ ）个0。

3.一台微波炉售价998元，买3台大约要花（ ）元。

4.21个14的和是（ ），24的32倍是（ ）。

5.王师傅平均每小时做18个零件，那么工作14个小时做了多少个零件？在括号里填上合适的数。

6.在 里填上“＞” “＜”或“=”。

二、判断。

（对的打“√”，错的打“×”）1.一个乘数的末尾有几个0，积的末尾就有几个0。

（ ）2.两个两位数相乘，积一定是三位数。

（ ）3.0与任何数相乘都得0。

（ ） 4.两数相乘的积一定大于它们的和。

（ ） 5.79×8□的计算结果一定比7200小。

（ ）三、快乐ABC 。

（选填正确答案） 1.50乘80的末尾有（ ）个0。

A.2B.3C.42.（2108·福建仙游）14×□6是一个两位数乘两位数的算式，乘积可能是（ ）。

A.84B.1156C.1344学校： 班级： 姓名： 考号：3.（2018·湖北宜昌）语文老师布置了一篇600字的作文，小红写了28行，平均每行18个字，字数够了吗？（）A.够了B.不够C.不知道4.小丽每分钟约走68米，她从家走到学校大约需要19分钟。

小丽家离学校大约有（）米。

A.1400B.1000C.1405.（2018·湖北宜昌）2辆汽车4次能运2400箱啤酒，平均每辆每次运啤酒多少箱？列式错误的是（）。

A.2400÷2÷4B.2400÷（2×4）C.2400÷(2+4）四、计算。

1.口算。

42×10= 0×80=12×30= 34×20=18×10= 130×2=2.脱式计算。

二年级下册数学试题-第四单元万以内数的认识测试卷-北京版（含答案）一.选择题(共5题，共10分)1.下列各组数的排列中，( )是正确的。

A．6120＞6100＞614B．4050＜4005＜4500C．3480＜2999＜4380D．798＞780＞8702.狗的脖套上有一个四位数的号码，四个数字的和是15，千位数字是十位数字的3倍，百位数字比个位数字多1，狗脖套上的号码是（）A.6324B.7251C.92313.比最小的四位数少10的数是（）。

A.990B.900C.9804.下面数中，一个0也不读的是（）。

A.5002B.1050C.10000D.36045.估一估，得数小于300的算式是（）。

A.876-476B.144+150C.724-346二.判断题(共5题，共10分)1.4050读作四千零五。

（）2.800减496的差接近300。

（）3.鲜花店原有595枝鲜花，上午卖掉306枝，大约还剩300枝。

（）4.611+192≈800（）5.678读作六七八。

（）三.填空题(共7题，共24分)1.用8，6，2，5这四个数写出的最大四位数（），最小的四位数是（）。

2.5468是由（）个千，（）个百，（）个一和（）个十组成的。

3.在横线上填上合适的数。

6_______7＞657 3_______49＞3549 789＞_______984.在横线上填上“>”“<”或“=”。

24÷4______6 49÷7______10 28÷4______36÷69×9______82 42-7______38 700+800______160045÷9______36÷4 400+600______900 35÷5______42÷65.口算。

74－27=______49＋35=______2400＋800=______5000－700=______6.用2，9，4可以组成________个不同的三位数，其中最大的数是________，最小的数是________。

2011年全国硕士研究生入学考试英语(二)试题Section I Use of EnglishDirections:Read the following text. Choose the best word(s) for each numbered black and mark A, B, C or D on ANSWER SHEET 1. (10 points)The Internet affords anonymity to its users, a blessing to privacy and freedom of speech. But that very anonymity is also behind the explosion of cyber-crime that has 1 across the Web.Can privacy be preserved 2 bringing safety and security to a world that seems increasingly 3 ?Last month, Howard Schmidt, the nation’s cyber-czar, offered the federal government a 4 to make the Web a safer place-a “voluntary trusted identity” system that would be the high-tech 5 of a physical key, a fingerprint and a photo ID card, all rolled 6 one. The system might use a smart identity card, or a digital credential 7 to a specific computer .and would authenticate users at a range of online services.The idea is to 8 a federation of private online identity systems. User could 9 which system to join, and only registered users whose identities have been authenticated could navigate those systems. The approach contrasts with one that would require an Internet driver’s license 10 by the government.Google and Microsoft are among companies that already have these “single sign-on” systems that make it possible for users to 11 just once but use many different services.12 .the approach would create a “walled garden”n cyberspace, with safe “neighborhoods” and bright “streetlights” to establish a sense of a 13 community.Mr. Schmidt described it as a “voluntary ecosystem”in which “individual s and organizations can complete online transactions with 14 ,trusting the identities of each other and the identities of the infrastructure 15 which the transaction runs”.Still, the administration’s plan has16 privacy rights activists. Some applaud the approach; others are concerned. It seems clear that such a scheme is an initiative push toward what would 17 be a compulsory Internet “drive’s license” mentality.The plan has also been greeted with 18 by some computer security experts, who worry that the “voluntary ecosystem”envisioned by Mr. Schmidt would still leave much of the Internet 19 .They argue that all Internet users should be 20 to register and identify themselves, in the same way that drivers must be licensed to drive on public roads.1. A. swept B. skipped C. walked D. ridden2. A. for B. within C. while D. though3. A. careless B. lawless C. pointless D. helpless4. A. reason B. reminder C. compromise D. proposal5. A. information B. interference C. entertainment D. equivalent6. A. by B. into C. from D. over7. A. linked B. directed C. chained D. compared8. A. dismiss B. discover C. create D. improve9. A. recall B. suggest C. select D. realize10. A. released B. issued C. distributed D. delivered11. A. carry on B .linger on C. set in D. log in12. A. In vain B. In effect C. In return D. In contrast13. A. trusted B. modernized C. thriving D. competing14. A. caution B. delight C. confidence D. patience15. A. on B. after C. beyond D. across16. A. divided B. disappointed C. protected D. united17. A. frequently B. incidentally C. occasionally D. eventually18. A. skepticism B. relevance C. indifference D. enthusiasm19. A. manageable B. defendable C. vulnerable D. invisible20. A. invited B. appointed C. allowed D. forcedSection II Reading ComprehensionPart ADirections: Read the following four texts. Answer the questions after each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. (40points)Text 1Ruth Simmons joined Goldman Sachs’s board as an outside director in January 2000: a year later she became president of Brown University. For the rest of the decade she apparently managed both roles without attracting much eroticism. But by the end of 2009 Ms. Simmons was under fire for having sat on Goldman’s compensation committee; how could she have let those enormous bonus payouts pass unremarked? By February the next year Ms. Simmons had left the board. The position was just taking up too much time, she said.Outside directors are supposed to serve as helpful, yet less biased, advisers on a firm’s board. Having made their wealth and their reputations elsewhere, they presumably have enough independence to disagree with the chief executive’s proposals. If the sky, and the share price is falling, outside directors should be able to give advice based on having weathered their own crises. The researchers from Ohio University used a database hat covered more than 10,000 firms and more than 64,000 different directors between 1989 and 2004. Then they simply checked which directors stayed from one proxy statement to the next. The most likely reason for departing a board was age, so the researchers concentrated on those “surprise” disappearances by directors under the age of 70.They fount that after a surprise departure, the probability that the company will subsequently have to restate earnings increased by nearly 20%. The likelihood of being named in a federal class-action lawsuit also increases, and the stock is likely to perform worse. The effect tended to be larger for larger firms. Although a correlation between them leaving and subsequent bad performance at the firm is suggestive, it does not mean that such directors are always jumping off a sinking ship. Often they “trade up.” Leaving riskier, smaller firms for larger and more stable firms.But the researchers believe that outside directors have an easier time of avoiding a blow to their reputations if they leave a firm before bad news breaks, even if a review of history shows they were on the board at the time any wrongdoing occurred. Firms who want to keep their outside directors through tough times may have to create incentives. Otherwise outside directors will follow the example of Ms. Simmons, once again very popular on campus.21. According to Paragraph 1, Ms. Simmons was criticized for .[A]gaining excessive profits[B]failing to fulfill her duty[C]refusing to make compromises[D]leaving the board in tough times22. We learn from Paragraph 2 that outside directors are supposed to be .[A]generous investors[B]unbiased executives[C]share price forecasters[D]independent advisers23. According to the researchers from Ohio University after an outside director’s surprise departure, the firm is likely to .[A]become more stable[B]report increased earnings[C]do less well in the stock market[D]perform worse in lawsuits24. It can be inferred from the last paragraph that outside directors .[A]may stay for the attractive offers from the firm[B]have often had records of wrongdoings in the firm[C]are accustomed to stress-free work in the firm[D]will decline incentives from the firm25. The author’s attitude toward the role of outside directors is .[A]permissive [B]positive [C]scornful [D]criticalText 2Whatever happened to the death of newspaper? A year ago the end seemed near. The recession threatened to remove the advertising and readers that had not already fled to the internet. Newspapers like the San Francisco Chronicle were chronicling their own doom. America’s Federal Trade commission launched a round of talks about how to save newspapers. Should they become charitable corporations? Should the state subsidize them ? It will hold another meeting soon. But the discussions now seem out of date.In much of the world there is the sign of crisis. German and Brazilian papers have shrugged off the recession. Even American newspapers, which inhabit the most troubled come of the global industry, have not only survived but often returned to profit. Not the 20% profit margins that were routine a few years ago, but profit all the same.It has not been much fun. Many papers stayed afloat by pushing journalists overboard. The American Society of News Editors reckons that 13,500 newsroom jobs have gone since 2007. Readers are paying more for slimmer products. Some papers even had the nerve to refuse delivery to distant suburbs. Yet these desperate measures have proved the right ones and, sadly for many journalists, they can be pushed further.Newspapers are becoming more balanced businesses, with a healthier mix of revenues from readers and advertisers. American papers have long been highly unusual in their reliance on ads. Fully 87% of their revenues came from advertising in 2008, according to the Organization for Economic Cooperation & Development (OECD). In Japan the proportion is 35%. Not surprisingly, Japanese newspapers are much more stable.The whirlwind that swept through newsrooms harmed everybody, but much of the damage has been concentrated in areas where newspaper are least distinctive. Car and film reviewers have gone. So have science and general business reporters. Foreign bureaus have been savagely cut off. Newspapers are less complete as a result. But completeness is no longer a virtue in the newspaper business.26. By saying “Newspapers like … their own doom” (Lines 3-4, Para. 1), the author indicates that newspaper .[A]neglected the sign of crisis[B]failed to get state subsidies[C]were not charitable corporations[D]were in a desperate situation27. Some newspapers refused delivery to distant suburbs probably because .[A]readers threatened to pay less[B]newspapers wanted to reduce costs[C]journalists reported little about these areas[D]subscribers complained about slimmer products28. Compared with their American counterparts, Japanese newspapers are much more stable because they .[A]have more sources of revenue[B]have more balanced newsrooms[C]are less dependent on advertising[D]are less affected by readership29. What can be inferred from the last paragraph about the current newspaper business?[A]Distinctiveness is an essential feature of newspapers.[B]Completeness is to blame for the failure of newspaper.[C]Foreign bureaus play a crucial role in the newspaper business.[D]Readers have lost their interest in car and film reviews.30. The most appropriate title for this text would be .[A]American Newspapers: Struggling for Survival[B]American Newspapers: Gone with the Wind[C]American Newspapers: A Thriving Business[D]American Newspapers: A Hopeless StoryText 3We tend to think of the decades immediately following World War II as a time of prosperity and growth, with soldiers returning home by the millions, going off to college on the G. I. Bill and lining up at the marriage bureaus.But when it came to their houses, it was a time of common sense and a belief that less could truly be more. During the Depression and the war, Americans had learned to live with less, and that restraint, in combination with the postwar confidence in the future, made small, efficient housing positively stylish.Economic condition was only a stimulus for the trend toward efficient living. The phrase “less is more” was actually first popularized by a German, the architect Ludwig Mies van der Rohe, who like other people associated with the Bauhaus, a school of design, emigrated to the United States before World War II and took up posts at American architecture schools. These designers came to exert enormous influence on the course of American architecture, but none more so that Mies.Mies’s signature phrase me ans that less decoration, properly organized, has more impact that a lot. Elegance, he believed, did not derive from abundance. Like other modern architects, he employed metal, glass and laminated wood-materials that we take for granted today buy that in the 1940s symbolized the future. Mies’s sophisticated presentation masked the fact that the spaces he designed were small and efficient, rather than big and often empty.The apartments in the elegant towers Mies built on Chicago’s Lake Shore Drive, for exa mple, were smaller-two-bedroom units under 1,000 square feet-than those in their older neighbors along the city’s Gold Coast. But they were popular because of their airy glass walls, the views they afforded and the elegance of the buildings’ details and pr oportions, the architectural equivalent of the abstract art so popular at the time.The trend toward “less” was not entirely foreign. In the 1930s Frank Lloyd Wright started building more modest and efficient houses-usually around 1,200 square feet-than the spreading two-story ones he had designed in the 1890s and the early 20th century.The “Case Study Houses” commissioned from talented modern architects by California Arts & Architecture magazine between 1945 and 1962 were yet another homegrown influence on the “less is more”trend. Aesthetic effect came from the landscape, new materials and forthright detailing. In his Case Study House, Ralph everyday life - few American families acquired helicopters, though most eventually got clothes dryers - but his belief that self-sufficiency was both desirable and inevitable was widely shared.31. The postwar American housing style largely reflected the Americans’ .[A]prosperity and growth[B]efficiency and practicality[C]restraint and confidence[D]pride and faithfulness32. Which of the following can be inferred from Paragraph 3 about Bauhaus?[A]It was founded by Ludwig Mies van der Rohe.[B]Its designing concept was affected by World War II.[C]Most American architects used to be associated with it.[D]It had a great influence upon American architecture.33. Mies held that elegance of architectural design .[A]was related to large space[B]was identified with emptiness[C]was not reliant on abundant decoration[D]was not associated with efficiency34. What is true about the apartments Mies building Chicago’s Lake Shore Drive?[A]They ignored details and proportions.[B]They were built with materials popular at that time.[C]They were more spacious than neighboring buildings.[D]They shared some characteristics of abstract art.35. What can we learn about the design of the “Case Study House”?[A]Mechanical devices were widely used.[B]Natural scenes were taken into consideration[C]Details were sacrificed for the overall effect.[D]Eco-friendly materials were employed.Text 4Will the European Union make it? The question would have sounded strange not long ago. Now even the project’s greatest cheerleader’s talk of a continent facing a “Bermuda triangle” of debt, population decline and lower growth.As well as those chronic problems, the EU faces an acute crisis in its economic core, the 16 countries that use the single currency. Markets have lost faith that the euro zone’s economies, weaker or stronger, will one day converge thanks to the discipline of sharing a single currency, which denies uncompetitive members the quick fix of devaluation.Yet the debate about how to save Europe’s single currency from disintegration is stuck. It is stuck because the euro zone’s dominant powers, France and Germ any, agree on the need for greater harmonization within the euro zone, but disagree about what to harmonies.Germany thinks the euro must be saved by stricter rules on borrow spending and competitiveness, barked by quasi-automatic sanctions for governments that do not obey. These might include threats to freeze EU funds for poorer regions and EU mega-projects and even the suspension of a country’s voting rights in EU ministerial councils. It insists that economic co-ordination should involve all 27 members of the EU club, among whom there is a small majority for free-market liberalism and economic rigors; in the inner core alone, Germany fears, a small majority favour French interference.A “southern”camp headed by French wants something different:”European economic government”within an inner core of euro-zone members. Translated, that means politicians intervening in monetary policy and a system of redistribution from richer to poorer members, via cheaper borrowing for governments through common Eurobonds or complete fiscal transfers. Finally, figures close to the France government have murmured, euro-zone members should agree to some fiscal and social harmonization: e.g., curbing competition in corporate-tax rates or labour costs.It is too soon to write o ff the EU. It remains the world’s largest trading block. At its best, the European project is remarkably liberal: built around a single market of 27 rich and poor countries, its internal borders are far more open to goods, capital and labour than any comparable trading area. It is an ambitious attempt to blunt the sharpest edges of globalization, and make capitalism benign.36. The EU is faced with so many problems that .[A] it has more or less lost faith in markets[B] even its supporters begin to feel concerned[C] some of its member countries plan to abandon euro[D] it intends to deny the possibility of devaluation37. The debate over the EU’s single currency is stuck because the dominant powers .[A] are competing for the leading position[B] are busy handling their own crises[C] fail to reach an agreement on harmonization[D] disagree on the steps towards disintegration38. To solve the euro problem, Germany proposed that .[A] EU funds for poor regions be increased[B] stricter regulations be imposed[C] only core members be involved in economic co-ordination[D] voting rights of the EU members be guaranteed39. The French proposal of handling the crisis implies that __ __.[A] poor countries are more likely to get funds[B] strict monetary policy will be applied to poor countries[C] loans will be readily available to rich countries[D] rich countries will basically control Eurobonds40. Regarding the future of the EU, the author seems to feel __ __.[A] pessimistic [B] desperate [C] conceited [D] hopefulPart BDirections: You are going to read a list of headings and a text about what parents are supposed to do to guide their children into adulthood. Choose a heading from the list A-G that best fits the meaning of each numbered part of the text（41-45）. There are two extra headings that you do not need to use. Mark your answers on ANSWER SHEET 1. （10 points）Leading doctors today weigh in on the debate over the government's role in promoting public health by demanding that ministers impose "fat taxes" on unhealthy food and introduce cigarette-style warnings to children about the dangers of a poor diet.The demands follow comments last week by the health secretary, Andrew Lansley, who insisted the government could not force people to make healthy choices and promised to free businesses from public health regulations.But senior medical figures want to stop fast-food outlets opening near schools, restrict advertising of products high in fat, salt or sugar, and limit sponsorship of sports events by fast-foodproducers such as McDonald's.They argue that government action is necessary to curb Britain's addiction to unhealthy food and help halt spiraling rates of obesity, diabetes and heart disease. Professor Terence Stephenson, president of the Royal College of Paediatrics and Child Health, said that the consumption of unhealthy food should be seen to be just as damaging as smoking or binge drinking."Thirty years ago, it would have been inconceivable to have imagined a ban on smoking in the workplace or in pubs, and yet that is what we have now. Are we willing to be just as courageous in respect of obesity? I would suggest that we should be," said the leader of the UK's children's doctors.Lansley has alarmed health campaigners by suggesting he wants industry rather than government to take the lead. He said that manufacturers of crisps and confectionery could play a central role in the Change4Life campaign, the centrepiece of government efforts to boost healthy eating and fitness. He has also criticised the celebrity chef Jamie Oliver's high-profile attempt to improve school lunches in England as an example of how "lecturing" people was not the best way to change their behaviour.Stephenson suggested potential restrictions could include banning TV advertisements for foods high in fat, salt or sugar before the 9pm watershed and limiting them on billboards or in cinemas. "If we were really bold, we might even begin to think of high-calorie fast food in the same way as cigarettes – by setting stringent limits on advertising, product placement and sponsorship of sports events," he said.Such a move could affect firms such as McDonald's, which sponsors the youth coaching scheme run by the Football Association. Fast-food chains should also stop offering "inducements" such as toys, cute animals and mobile phone credit to lure young customers, Stephenson said.Professor Dinesh Bhugra, president of the Royal College of Psychiatrists, said: "If children are taught about the impact that food has on their growth, and that some things can harm, at least information is available up front."He also urged councils to impose "fast-food-free zones" around schools and hospitals – areas within which takeaways cannot open.A Department of Health spokesperson said: "We need to create a new vision for public health where all of society works together to get healthy and live longer. This includes creating a new 'responsibility deal' with business, built on social responsibility, not state regulation. Later this year, we will publish a white paper setting out exactly how we will achieve this."The food industry will be alarmed that such senior doctors back such radical moves, especially the call to use some of the tough tactics that have been deployed against smoking over the last decade.Part CDirections: In this section there is a text in English. Translate it into Chinese. Write your translation on ANSWER SHEET 2. (15 points)Who would have thought that, globally, the IT industry produces about the same volume of greenhouse g ases as the world’s airlines do—roughly 2 percent of all CO2 emissions?Many everyday tasks take a surprising toll on the environment. A Google search can leak between 0.2 and 7.0 grams of CO2, depending on how many attempts are needed to get the “right”answer. To deliver results to its users quickly, then, Google has to maintain vast data centres round the world, packed with powerful computers. While producing large quantities of CO2, these computers emit a great deal of heat, so the centres need to be well air-conditioned, which uses even more energy.However, Google and other big tech providers monitor their efficiency closely and make improvements. Monitoring is the first step on the road to reduction, but there is much more to be done, and not just by big companies.Section IV WritingPart ADirection:Suppose your cousin, Liming, has just been admitted to a university, write him/her a letter to1) congratulate him/her, and2) give him/her suggestions on how to get prepared for university life.Your should write about 100 words on ANSER SHEET 2.Do not sign your own name at the end of the letter. Use “Zhang Wei” instead.Do not write the address. (10 points)Part BDirections:Write a short essay based on the following chart. In your writing, you should1) interpret the chart and2) give your comments.You should write at least 150 words.Write your essay on ANWER SHEET 2.(15 points).2008、2009年国内轿车市场部分品牌市场份额示意图从左至右依次：国产品牌日系品牌美系品牌2011年全国硕士研究生入学统一考试(英语二)试题参考答案section I Use of English1~5 ACBDD 6~10 BACCB 11~15 DBACA 16~20 ADACDSection II Reading comprehensionPartA21~25: ACCAB 26~30: DBCDA 31~35: CDCDB 36~40: BDBADPart B41-45: EDBBGPart C从全球范围来看，有谁会想到IT 行业释放的温室气体与全球航空公司产生的一样多呢？它大约占总二氧化碳总排量的2%。

一、填一填。

第四单元表内乘法（一）AK 6+6+6+6+6二( ),表示（）个（）相加的和是（ 写成乘法算式是（）X （ ）二（ ）,口诀是（)o2> 5+5+5+5=(),表示( ）相加的和是（ 写成乘法算式是（）X （）二（）,口诀是（)o3.4X3=(）,读作（）,用口诀（）来计4、6X4=(）,用口诀）来计算。

在O 里填上“+” “-”或Q 3=5C >25.5(_)5=12' 6 二 126、在（里填上适当的数。

8、 9、6X 5X)=12( ) Xl 二2X3 )=205× ( ) =15 3×4=6× ()4X2=1+ () 6X ()二366X (4X4=8+根据口诀“三六十八”可以写出两个乘法算式是（)θ根据口诀“五六三十”可以写出两个乘法算式是（)o用口诀“四六二十四”写出两道乘法算式（=24（ ）、（ ）。

11、把口诀补充完整。

二四（) (）得五（ ）二十 (）十六( ）十八（ ）二十五 ( ）三十六 ( ）三十（）二十四( ）五十五 ( ）五一十 • ( ) I 一(）二十五(）三十（）得九12、(）里最大能填几？5× ( )<21 12> ( )X2 11>2× () ()×6<37 () ×5<24()×4<10 4X ()<253X ()<176×5> (5×5> （ ）（ )×6<20 34>5× ( )33>6× () 5× ( )<29 ()×4<2913、 在（ ）里填上适当的数。

5×2+5=5 × （ ） 6×5+6= （） ×6（）×6-6=6×44× （ ） +4=4X514、 在O 里填上“>” “V”或“二” o 4X5i5×42+5θ2×53X5（L 3+5 6×lθβ+l 2X63X45X66+515、 在加法算式9+9+9+9+8中，添上（），就可以用乘法算式9X5表示。

第九单元精品检测卷(含答案)一、把1～6这六个数填入下面的方格中，要求每一行右边的数比左边的数大，每一列下面的数比上面的数大。

二、连一连。

甲、乙、丙三位老师是语文、数学和英语三门功课的任课教师(每人只教一科)。

甲乙丙语文老师数学老师英语老师三、A、B、C、D四人参加学校的书法比赛，成绩如下。

A：“我的得分不是最高的，也不是最低的。

”B：“我的得分不是第一，也不是第二。

”C：“我的得分不是第三，也不是第四。

”D：“我的得分比C高。

”请用表格把他们的名次推断出来。

画“√”表示。

第一第二第三第四ABCD四、黑兔、白兔和灰兔三只兔子赛跑，黑兔说：“我跑得不是最快的，但比白兔快。

”请你猜一猜，谁跑得最快？谁跑得最慢？五、丽丽、辉辉和佳佳，一个是班长，一个是学习委员，一个是劳动委员。

他们三人中谁是班长？谁是学习委员？谁是劳动委员？六、在下面的方格中，每行、每列都有1～5这五个数，并且每个数在每行、每24A515B2441C553七、△和□各代表几？△＋△＋△＝27□×△＝45一、123456(填法不唯一)二、第一第二第三第四A√B√C√D√五、佳佳是班长，丽丽是学习委员，辉辉是劳动委员。

六、A是1B是3C是5七、△是9□是5第九单元达标测试卷(含答案解析)一、单选题(总分：40分本大题共8小题，共40分)1.(本题5分)A、B、C、在某次比赛中获得前三名，老师猜测：A不是第一名；B不是第一名；C不是第二名．已知老师猜测的这三句话中只有一句是正确的且无并列情况，那么C是第（）名．A.一B.二C.三2.(本题5分)从A、B、C、D、E、F六位同学中选出四位参加数学竞赛有下列六条线索：①A、B两人中至少有一个人选上②A、D不可能一起选上③A、E、F三人中有两人选上④B、C两人要么都选上，要么都选不上；⑤C、D两人中有一人选上；⑥如果D没有选上，那么E也选不上．你能分析出是哪四位同学获选吗？请你选择正确的答案（）A.A、B、C、F；B.A、B、C、D；C.A、C、D、F；D.A、B、D、F3.(本题5分)小丽比小洁重，小洁比小梅重，小丽比小新轻一些，这四个同学中（）最轻．A.小丽B.小洁C.小梅D.小新4.(本题5分)李冰、王亮、胡江、张风一起排队上车。

最新人教版六年级数学下册二单元达标试题及答案说明：本套试卷精心编写了各考点和重要知识点，测试面广，难易兼备，仅供参考。

全套试卷共八卷。

目录：最新人教版六年级数学下册二单元达标试题及答案（一）最新人教版六年级数学下册二单元阶段检测及答案（二）最新人教版六年级数学下册二单元阶段测试卷及答案（三）最新人教版六年级数学下册二单元题及答案（四）最新人教版六年级数学下册二单元题及答案（五）最新人教版六年级数学下册二单元题及答案（六）最新人教版六年级数学下册二单元题及答案（七）最新人教版六年级数学下册二单元题及答案（八）最新人教版六年级数学下册二单元达标试题及答案一班级：姓名：满分：100分考试时间：90分钟一、填空题。

（20分）1、陈明每天从家到学校上课，如果步行需要15分钟，如果骑自行车则只需要9分钟，他步行和骑自行车的最简速度比是（__________）。

2、在一个长12厘米，宽8厘米的长方形纸上画一个最大的圆，这个圆的半径是_____厘米，面积是_____平方厘米．3、一根12分米长的圆柱形钢材截成2小段后，表面积比原来增加了18平方分米，这根钢材的底面面积是（_________）平方分米，原来的体积是（__________）立方分米。

4、射线有________个端点，直线________端点，线段有________个端点．5、某一筐水果中有苹果和梨若干个。

若每次拿出1个苹果和1个梨，则拿到没有苹果时，还剩下50个梨；若每次拿走1个苹果和3个梨，则拿到没有梨时，苹果还剩下50个。

那么这筐水果共有________个。

6、把22个苹果放在7个盘里，不管怎样放，总有一个盘子里至少放进（_______）个苹果。

7、把两个完全一样的圆柱，拼成一个长30厘米的圆柱，但表面积减少25.12平方厘米，原来每个圆柱的体积是（_________）立方厘米。

8、鸡、兔同笼，一共有94只脚，兔比鸡少11只，鸡有________只，兔有________只．9、一个长方体长6分米、宽5分米、高4分米，把它分成两个长方体，表面积最小增加（_____）平方分米，最多增加（_____）平方分米。