2017学年第二学期期中检测题

上海民办新竹园中学2017学年第二学期数学学科七年级期中测验卷————————————————————————————————作者：————————————————————————————————日期：上海民办新竹园中学2017学年第二学期数学学科七年级期中考试卷（考试时间90分钟，满分100分）一. 填空题（本大题共16题，每题2分，满分32分）1. 若△ABC 的三边长都是整数，周长为11，且有一边长为4，则这个三角形可能的最大边长是_________ .2. 已知515.29.153≈，不使用计算器，求30000159.0的近似值__________ .3. 如果1||-=aa ，那么122|12|2+---a a a =__________ .4. 比较大小：35______57--.5. 若aa a a 1,51+=+则=___________ .6. 用幂的形式表示：312551=__________ .7. 已知xx22315--有意义，求x 的取值范围__________ .8. ()29-的平方根是x ，64的立方根是y ，则y x +的值为____________ .9. 如果一个等腰三角形其中一腰上的高与另一腰的夹角是35°，那么这个等腰三角形的顶角等于__________ .10. 等腰三角形一边长为2，另一边长为32，那么这个三角形的周长为_________ .11. 如下图，的和ACB ABC ∠∠外角平分线交于点O ，设α=∠BOC ，则=∠A _____ .12. 9条不重合的直线相交于一点，构成的对顶角有_________ 对.13. 如下图，两平面镜α，β的夹角θ，入射光线AO 平行于β，入射到α上，经两次反射后的出射光线CB 平行于α，则角θ等于_______________ .14. 如图，在△ABC 中高AD 与高BE 交于H ，AC BH =，那么∠ABC =_______度.15. 如图，︒=∠65A ，︒=∠75B ，将纸片的一角折叠，使点C 落在△ABC 内，则21∠+∠的度数为__________ .16. 如图，△ABC 是边长为3的等边三角形，△BDC 是等腰三角形，且∠BDC =120°，以D 为顶点作一个60°角，使其两边分别交AB 于点M ，交AC 于点N ，联结MN ，则 △AMN 的周长为__________ .二．选择题（本大题共4题，每题2分，满分8分）17. 将长度为20的铁丝围成三边长均为整数的三角形，那么不全等的三角形的个数是（ ） A. 5 B. 6 C. 8 D. 1018. 在△ABC 中，AC=5，中线AD=7，则AB 边的取值范围是 （ ）A. 291＜＜ABB. 244＜＜ABC. 195＜＜ABD. 199＜＜AB19. 已知：⎪⎪⎭⎫ ⎝⎛-=-n n x 111991199121（n 是自然数）.那么()n x x 21+-的值是（ ）A. 11991-B. 11991-- C. ()119911--nD. ()19911n-20. 如图所示，已知△ABC 和△BDE 都是等边三角形，且A 、B 、D 三点共线. 下列结论：AD.⑥FG BFG ⑤60AHC ④ AHD;③HB BG ;②BF CD;AE ①∥是等边三角形；△；平分︒=∠∠==其中正确的有（ ）A. 3个B. 4个C. 5个D. 6个三．计算题（21、22每题5分，23、24每题6分）21. ()242331243225.0---÷⎪⎪⎭⎫⎝⎛⨯ 22.352725213+++23. z y x 、、适合于关系式：y x y x m y x m y x --+-+=-++--+2004200432353，求4-m 的平方根.24. 已知：.3969,25,723543334314322334223的值求ba b bba b a b b a b a +⋅+--==---四．解答题25.（本题满分6分）如图，在四边形ABCD中，AB=BC，BF平分∠ABC，AF∥DC，联结AC、CF，求证：CA是∠DCF的平分线.26.（本题满分7分）D为等腰直角三角形ABC的斜边AB的中点，DM⊥DN，DM、DN分别交BC、CA于点E、F.（1）当∠MDN绕点D转动时，求证DE=DF.（2）若AB=2，求四边形行DECF的面积.27.（本题满分8分）如图，已知等边△ABC，P是AC延长线上一点，以PA为边作等边△APE，EC延长线交BP于M，联结AM，求证：（1）BP=CE；（2）试证明：EM-PM=AM.28. （本题满分8分）如图，在边长为1的正方形ABCD 中，AB=BC=CD=AD ，四个内角均为90°，点E 、F 分别在BC 、CD 上移动，∠EAF 的大小始终保持45°，问：在E 、F 移动过程中，（1）猜想EF 、BE 、DF 的长度之间有什么关系，并证明； （2）点A 到EF 的距离AH 是否发生变化？请说明理由.29. （本题满分9分）已知等边△ABC 和点P ，设点P 到△ABC 三边AB 、AC 、BC 的距离分别是321h h h 、、，△ABC 的高为h ，请你探索以下问题：（1）若当点P 在一边BC 上（图1），此时03 h ，问h h h 与、21之间有怎样的数量关系？请说明理由；（2）若当点P 在△ABC 内（图2），此时h h h h 与、、321之间有怎样的数量关系？请说明理由；（3）若当点P 在△ABC 外（图3），此时h h h h 与、、321之间有怎样的数量关系？请说明理由；。

2016-2017学年度第二学期期中考试七年级数学试卷第Ⅰ卷（选择题，共30分）一、选择题（每题3分，共30分）1．9的算术平方根是A ．3±B ．9±C ．3D ．-32. 在平面直角坐标系中，点P （－3，5）所在的象限是A.第一象限B.第二象限C.第三象限D.第四象限3.在同一个平面内,两条直线的位置关系是A.平行或垂直B.相交或垂直C. 平行或相交D. 不能确定 4．如图所示，四幅汽车标志设计中，能通过平移得到的是奥迪 本田 大众 铃木A ． B. C. D. 5.如图，梯子的各条横档互相平行，若∠1=80，则∠2的度数是A.80B.100C.120D.1506. 如图，点E 在AC 的延长线上，下列条件能判断AB ∥CD 的是A.∠3=∠4B.∠1=∠2C.∠D=∠DCED.∠D+∠ACD=180°7.已知直角坐标系中点P 到y 轴的距离为5，且点P 到x 轴的距离为3，则这样的点P 的个数是 A ．1 B ．2 C ．3D ．48．在实数23-，0.7 ，34，π，16中，无理数的个数是 A ．1B ．2C ．3D ．49.如图，将一块含有30°角的直角三角板的两个顶点叠放在矩形的两条对边上，如果∠1=27°，那么∠2的度数为A ．53°B ．55°C ．57°D ．60°第6题图 第5题图10．如图，直线l 1∥l 2，∠A=125°，∠B=85°，则∠1+∠2= A ．30° B ．35° C ．36° D ．40°第Ⅱ卷（非选择题 共90分）二、填空题：(每题3分，共18分)11．在直角坐标系中,写出一个在纵轴的负半轴上点的坐标 . 12．若一个数的平方根等于它本身，则这个数是13.若a 是介于3与7之间的整数，b 是2的小数部分，则ab-22的值为 14. 如图，将△ABC 沿BC 方向平移2cm 得到△DEF，若△ABC 的周长为16cm ，则四边形ABFD 的周长为 cm15.如果两个角的两边分别平行，其中一个角比另一个角的2倍少36°，那么这两个角 是16. 如图，将正整数按如图所示规律排列下去，若用有序数对（m ，n ）表示m 排从左到右第n 个数。

2017-2018学年度第二学期期中教学质量监测高二物理试题一、单项选择题：本题共12小题，每小题3分，共36分．每小题只有一个．．．．选项符合题意．1.下列关于温度及内能的说法中正确的是()A．温度是分子平均动能的标志，所以两个动能不同的分子相比，动能大的温度高B．两个不同的物体，只要温度和体积相同，内能就相同C．质量和温度相同的冰和水，内能是相同的D．一定质量的某种物质，即使温度不变，内能也可能发生变化2.下列说法正确的是()A．布朗运动的无规则性反映了液体分子运动的无规则性B．悬浮在液体中的固体小颗粒越大，则其所做的布朗运动就越剧烈C．物体的温度为0 ℃时，物体的分子平均动能为零D．布朗运动的剧烈程度与温度有关，所以布朗运动也叫热运动3.一定质量的理想气体经历一系列变化过程，如图所示，下列说法正确的是()A．b→c过程中，气体压强不变，体积增大B．a→b过程中，气体体积减小，压强减小C．c→a过程中，气体压强增大，体积不变D．c→a过程中，气体内能增大，体积变小4.图为一定质量理想气体的压强p与体积V的关系图象，它由状态A经等容过程到状态B，再经等压过程到状态C.设A、B、C状态对应的温度分别为T A、T B、T C，则下列关系式中正确的是()A．T A<T B，T B<T C B．T A>T B，T B＝T CC．T A>T B，T B<T C D．T A＝T B，T B>T C5.关于热力学定律，下列说法正确的是()．A．在一定条件下物体的温度可以降到0 KB．物体从单一热源吸收的热量可全部用于做功C．吸收了热量的物体，其内能一定增加D．压缩气体气体的温度一定升高6.如图所示，一定量的理想气体从状态a沿直线变化到状态b，在此过程中，其压强() A．逐渐增大B．逐渐减小C．始终不变D．先增大后减小7.下列现象或事例不可能．．．存在的是()．A．80 ℃的水正在沸腾B．水的温度达到100 ℃而不沸腾C．沥青加热到一定温度时才能熔化D．温度升到0 ℃的冰并不融化8.做布朗运动实验，得到某个观测记录如图，图中记录的是()A．分子无规则运动的情况B．某个微粒做布朗运动的轨迹C．某个微粒做布朗运动的速度－时间图线D．按等时间间隔依次记录的某个运动微粒位置的连线9.某驾驶员发现中午时车胎内的气压高于清晨时的，且车胎体积增大．若这段时间胎内气体质量不变且可视为理想气体，那么()A．外界对胎内气体做功，气体内能减小B．外界对胎内气体做功，气体内能增大C．胎内气体对外界做功，内能减小D．胎内气体对外界做功，内能增大10.两个相距较远的分子仅在分子力作用下由静止开始运动，直至不再靠近．在此过程中，下列说法不正确．．．的是()A．分子力先增大，后一直减小B．分子力先做正功，后做负功C．分子动能先增大，后减小D．分子势能和动能之和不变11.如图所示的绝热容器，隔板右侧为真空，现把隔板抽掉，让左侧理想气体自由膨胀到右侧至平衡，则下列说法正确的是()A．气体对外做功，内能减少，温度降低B．气体对外做功，内能不变，温度不变C．气体不做功，内能不变，温度不变，压强减小D．气体不做功，内能减少，压强减小12.在装有食品的包装袋中充入氮气，然后密封进行加压测试，测试时，对包装袋缓慢施加压力，将袋内的氮气视为理想气体，在加压测试过程中，下列说法中不正确．．．的是() A．包装袋内氮气的压强增大B．包装袋内氮气的内能不变C．包装袋内氮气对外做功D．包装袋内氮气放出热量二、多项选择题：本题共8小题，每小题4分，共32分．每小题有多个选项符合题意．全部选对的得4分，选对但不全的得2分。

山东省烟台市2017-2018年初三数学第二学期期中考试试题及答案一、选择题（每题3分，共36分）1、下列各式中，一定是二次根式的是（ ） A.4- B.32a C. 24x + D. 1x -2、下列计算结果正确的是（ ） A.8182-=- B. 22a b a b -=- C. 527+= D.68322+=+ 3、下列关于x 的一元二次方程中，一定是一元二次方程的是（ ） A. x -1=0 B. x 3+x =3 C. x 2+3x -5=0 D. ax 2+bx+c =0 4、下列一元二次方程中，两实根之和为1的是（ ） A. x 2-x +1=0 B. x 2+x -3=0 C. 2x 2-x -3=0 D. x 2-x -5=0 5、在二次根式322216,,0.5,,2a x a b x--中，最简二次根式有（ ）个 A. 1 B. 2 C. 3 D. 4 6、若x<0，则23x x +的结果为（ ）A. -4xB. 4xC. -2xD. 2x7、某村2015年人均纯收入为26200元，2017年人均纯收入为38500元，设该村年人均纯收入的平均增长率为x ，则下面列出的方程中正确的是（ ）A. 26200（1+x 2）=38500B. 26200（1+2x ）=38500C. 26200（1+x ）=38500D. 26200（1+x ）2=38500 8、在下列各组二次根式中，不是同类二次根式的是（ ） A.4520和 B.1118352和C. 1218和D. -2454和 9、若方程x 2-2x -1=0 的两根为x 1，x 2，则-x 1-x 2+x 1x 2的结果是（ ）A. -1B. 1C. -3D. 310、用配方法解方程2x 2+6=7x 时，配方后所得的方程为（ ）A. 2737+=24x ⎛⎫ ⎪⎝⎭B.2737-=24x ⎛⎫ ⎪⎝⎭C.271+=416x ⎛⎫ ⎪⎝⎭ D.271-=416x ⎛⎫ ⎪⎝⎭ 11、使代数式1433x x +-+有意义的整数x 有（ ） A. 5个 B. 4个 C. 3个 D. 2个12、如图，将一块正方形空地划出部分区域进行绿化，原空地一边减少了2m ，另一边减少了3m ，剩余一块面积为20m2的矩形空地，则原正方形空地的边长是（ ） A ．10m B ．9m C ．8m D ．7m 二、填空题（每题3分，共18分）13、已知a<b ，化简二次根式22a b -的结果是 .14、已知n 是一个正整数，48n 是整数，则n 的最小值是 .15、已知实数m 满足m 2-3m +1=0，则代数式2219+2m m +的值等于 . 16、关于x 的一元二次方程x 2+2x +k +1=0实数解是x 1和x 2，若x 1+x 2-x 1x 2<-1，则k 的取值范围是 . 17、把小圆形场地的半径r m 增加5m 得到大圆形场地，场地面积增加了一倍，则小圆形场地的半径为 ..18、已知x=0是一元二次方程(22+320m x x m+-=的一个根，则m 的值为 .三、解答题（66分） 19、（6分）计算：（1） （2）-20、（6分）解方程：（1）2x 2-3x -3=0 （2）（x -1）（x +2）=4.21、（6分）若x 1和x 2是关于x 的方程x 2-2（m +1）x +m 2+2=0的两实数根，且x 1、x 2满足（x 1+1）（x 2+1）=8，求m 的值.22、（6分）（1）是否存在实数m ，使最简二次根式m 的值；若不存在，说明理由.（2x=时的值.23、（6分）（1）若a=，求4a2-8a-3的值.（2）若一元二次方程ax2=b（ab>0）的两个根分别是m+1和2m-4，求ba的值.24、（8分）把一根长为40cm的铁丝剪成两段，并把每一段各围成一个正方形．（1）要使这两个正方形的面积之和等于52cm2，该怎么剪？（2）这两个正方形的面积之和能等于44cm2吗？请说明理由．25、（8分）水果市场某批发商经销一种高档水果，如果每千克盈利10元，每天可售出500千克，经市场调查发现，在进货价不变的情况下，若每千克涨价1元，日销售量将减少20千克.现要保证每天盈利6000元，同时又要让顾客尽可能多得到实惠，那么每千克应涨价多少元？（1）设每千克应涨价x元，根据问题中的数量关系，用含x的代数式填表：每千克盈利（元）每天销售量（千克）每天盈利（元）涨价前10 500 5000涨价后6000（2）列出方程，并求出问题的解.26、（10分）某林场计划修一条长750m，断面为等腰梯形的渠道，断面面积为1.6m2，上口宽比渠深多2m，渠底比渠深多0.4m.（1）渠道的上口宽与渠底宽各是多少？（2）如果计划每天挖土48m3，需要多少天才能把这条渠道挖完？27、（10分）如图，Rt△ABC中，∠ACB=90°，AC=6cm，BC=8cm，动点P从点B出发，在BA边上以5cm/s的速度向点A匀速运动，同时动点Q从点C出发，在CB边上以4cm/s的速度向点B匀速运动，运动时间为ts（0＜t＜2），连接PQ．当△CPQ是以PC为腰的等腰三角形时，求t的值．2017-2018学年度第二学期期中学业水平考试初三数学答案一、选择题（本题共12个小题，每小题3分，满分36分）每小题都给出标号为A ，B ，C ，D 四个备选答案，其中有且只有一个是正确的). CACDB CDCCD BD二、填空题（本题共6个小题，每小题3分，满分18分）13. b a 2-- 14. 3 15. 9 16.02≤<-k 17. m)255(+ 18.2- 三、解答题（本大题共8个小题，满分66分，解答应写出文字说明，证明过程或演算步骤） 19.解：（1）23322233272833-=-+-=-+-┄┄ 3分 （2）原式=632232233322=++-- ┄┄┄┄┄┄┄┄ 6分 20. 解（1）43331+=x ,43332-=x ┄┄┄┄┄┄┄┄ 3分 (2)21=x ,32-=x ┄┄┄┄┄┄┄┄ 6分21．解：由题意知 )1(221+=+m x x ,2221+=m x x又8)1)(1(21=++x x ， 即812121=+++x x x x 得812)1(22=++++m m 31-=m ，12=m ┄┄┄┄┄┄┄┄ 3分 ()0)2(4)1(222>+-+-=∆m m 解之得21>m ，31-=m 舍去 所以1=m ┄┄┄┄┄┄┄┄ 6分22.(1)解：存在，若1122-=-m m ,9=m ┄┄ 2分(2)解：4)1(4)1(22-+-+-xx x x 22221212xx x x +--++=|1||1|)1()1(22x x x x x x x x --+=--+=┄┄┄┄┄┄ 4分 23)23)(23(23231+=+-+=-=x231-=x 321=+x x ,221=-xx原式2232-=┄┄┄┄┄┄ 3分 23.(1)解：,12)12)(12(12121+=+-+=-=a7)1(47)12(4384222--=-+-=--a a a a a 将12+=a 代入得原式=1┄┄┄┄┄┄ 3分 (2)解：因为)0( 2>=ab b ax 0421=-++m m 解得1=m ,则方程)0( 2>=ab b ax 的两个根分别是2、2- 所以b a =4,4=ab┄┄┄┄┄┄ 6分 24. 解：设剪成的较短的这段为x cm ，较长的这段就为)40(x -cm ， 由题意，得52)440()4(22=-+x x ； 解得：24,1621==x x ， 当16=x 时，较长的为)(241640cm =-，当24=x 时，较长的为24162440<=-（舍去） ∴较短的这段为cm 16，较长的这段就为cm 24；┄┄┄┄┄┄ 4分（2）设剪成的较短的这段为m )(cm ，较长的这段就为)40(m -cm 由题意得：44)440()4(22=-+m m ， 变形为：0448402=+-m m ，0192<-=∆方程无解 这两个正方形的面积之和不可能等于44cm 2．┄┄┄┄┄┄ 8分25. 解：（1）由题意，得涨价后的盈利为：)10(x +元，每天的销量为：)20500(x -千克； 故答案为：)10(x +，)20500(x - ┄┄┄┄┄┄ 4分 （2）设每千克应涨价x 元，则现在的利润为)10(x +元， 销量为)20500(x -， 由题意，得60)20500)(10(=-+x x解得：51=x ,102=x要使顾客得到实惠，5=x答：每千克应涨价5元．┄┄┄┄┄┄ 8分26. 解：（1）设渠深为xm ，则上口宽为（x+2）m ， •渠底为（x+0.4）m根据梯形的面积公式可得：（x+2+x+0.4）=1.6整理，得：5x2+6x-8=0解得x1===0.8，x2=-2（舍）∴上口宽为2.8m ，渠底为1.2m ；（2）如果计划每天挖土48m3，需要=25（天）才能把这条渠道挖完答：渠道的上口宽与渠底深各是2.8m 和1.2m ；需要25天才能挖完渠道.27. 解：如图，作CBPM ⊥于点M . ①若PQ PC =,则t BP 5=,t BM 28-=因为ACPM //,所以108528=-t t ,解得34=t ┄┄┄┄┄┄ 4分 ②若CQ PC =,则t PC 4=,t BP 5=,t BM 4=,t PM 3=,从而有t CM 48-=┄┄┄┄┄┄ 6分在PMC Rt ∆中，222CMPM PC += 即222)4()3()48(t t t =+- 0646492=+-t t 解之得：97832±=t . 而297832>+不合题意；2978320<-<，符合题意 所以34=t 或97832-=t 时， CPQ ∆是以PC 为腰的等腰三角形┄┄┄┄┄┄ 10分ABCPQM。

2016-2017学年度第二学期高二期中六校联考化学试卷命题人：宝坻一中张立杰芦台一中于树洋说明：1.本试题分Ⅰ、Ⅱ两卷，试卷的答案应按照要求填涂到答题卡上可能用到的相对原子质量 H 1 C 12 O 16第Ⅰ卷（共45分）一、选择题（本题包括15小题，每题只有一个正确答案，每题2分共30分）1．下列化学用语正确的是：A. 羟基的电子式：B. 聚丙烯的结构简式：C. 乙烯的结构简式：CH2CH2D. 苯甲酸的结构简式：2．乙烯的相关转化关系如图，下列说法正确的是A. 1mol聚乙烯含有的原子数目为6N AB. CH3 OCH3与甲互为同分异构体C. X为C12D. 甲→乙反应类型为取代反应3．1mol某链烃最多可与2mol H2发生加成反应生成化合物A，化合物A 最多能与12mol Cl2发生取代反应生成化合物B，则下列有关说法正确的是( )A．该烃分子内既有碳碳双键又有碳碳三键B．该烃分子内碳原子数超过6C．该烃能发生氧化反应和加聚反应D．化合物B有两种同分异构体4．下列实验处理可行的是（）①．将与NaOH的醇溶液共热制备CH3—CH═CH2②．向甲酸和甲醛的混合物中加入氢氧化钠溶液，中和甲酸后，加入新制的氢氧化铜加热——检验混合物中是否含有甲醛③．向丙烯醛（CH2=CH—CHO）中滴入KMnO4(H+)溶液，观察紫色褪去，能证明结构中存在碳碳双键④．实验时手指不小心沾上苯酚，立即用70o以上的热水清洗⑤．用溴水除去混在苯中的己烯,分液得到纯净的苯⑥．将电石与水反应产生的乙炔通入溴水中，溴水褪色，证明乙炔和溴水发生了加成反应A．只有① B．只有①④ C．只有①③④⑥ D．都不能5、除去下列物质中所含少量杂质(括号内为杂质)，所选用的试剂和分离方法能达到实验目的的是A．硝基苯（硝酸） NaOH溶液分液B．乙烯（二氧化硫）酸性高锰酸钾洗气C．乙酸乙酯（乙酸） NaOH溶液蒸馏D．苯（苯酚）溴水过滤6、某醇在适当条件下与足量的乙酸发生酯化反应，得到的酯的相对分子质量a与原来醇的相对分子量b的关系是a=b+84，有关该醇应该具有的结构特点的描述正确的是A．该醇分子中一定具有甲基B．该醇分子中一定没有甲基C．该醇分子中至少含有三个碳原子D．该醇分子中具有两个醇羟基7．CH3—CH===CH—Cl有下列反应或现象：①取代反应，②加成反应，③消去反应，④使溴水褪色，⑤使酸性KMnO4溶液褪色，⑥与AgNO3溶液生成白色沉淀，⑦聚合反应。

潘集区2017—2018学年第二学期期中教学质量检测七年级地理试题一、选择题（每题2分，共40分）1. 亚洲季风气候显著，主要是受什么因素影响（）A. 纬度位置B. 海陆位置C. 地形因素D. 洋流因素【答案】B【解析】试题分析：亚欧大陆东部形成典型的季风气候，主要原因是由于这里背靠最大的大陆，东临最大的太平洋，受海陆热力性质差异的影响，季风气候显著，故选B.考点：本题考查亚洲气候的有关知识.2. 亚洲第一长河是（）A. 长江B. 黄河C. 湄公河D. 印度河【答案】A【解析】试题分析：长江长度6300多千米,长度世界第三,仅次于尼罗河和亚马孙河,在亚洲居首位。

考点：亚洲的河流3. 亚、非、欧三大洲都濒临的海是（）A. 阿拉伯海B. 地中海C. 黑海D. 里海【答案】B【解析】本题考查亚、非、欧三大洲濒临的海洋。

亚、非、欧三大洲都濒临地中海。

4. 亚洲季风气候区水旱灾害频繁的主要原因是（）A. 不同年份冬季风的强弱不同B. 纬度位置的影响C. 不同年份夏季风的强弱不同D. 地形的影响【答案】C【解析】本题主要考查亚洲季风区水旱灾害比较频繁的主要原因。

夏季风的强弱与雨带进退的“失常”，往往会造成旱涝灾害。

夏季风强或来的早，会出现涝灾；夏季风弱或来的晚，则会导旱灾。

5. 世界上各种气候类型中，在亚洲没有分布的是（）A. 温带季风气候B. 温带海洋性气候C. 地中海气候D. 热带雨林气候【答案】B【解析】亚洲面积广大，地跨寒、温、热三带，且地形复杂多样，除温带海洋性气候和热带草原气候外，世界上的各种气候在亚洲都有分布．6. 世界上跨纬度最广的大洲是（）A. 北美洲B. 南极洲C. 非洲D. 亚洲【答案】D【解析】本题考查亚洲的纬度位置。

北部深入北极圈内，南部延伸到赤道以南，是跨纬度最广的大洲。

7. 世界最低的洼地是（）A. 贝加尔湖B. 吐鲁番盆地C. 死海D. 里海【答案】C【解析】本题考查亚洲的世界之最。

【试卷名称】广州六中2016-2017学年度第二学期高二级英语科期中考试试卷出题人：高二英语备课组审题人：王慧珊预测分：105 本试卷分I卷和II卷两部分，共14页，满分为150+5分。

考试用时120分钟。

注意事项：1. 选择题每小题选了答案后，用2B铅笔把答题卡上对应题目信息点涂黑，如需改动，用橡皮擦干净后，再选涂其他答案，答案不能答在试卷上。

2. 非选择题必须用黑色字迹的钢笔或签字笔在答卷纸上作答，答案必须写在答卷纸各题目指定区域内的相应位置上，超出指定区域的答案无效。

不准使用铅笔和涂改液。

3. 必须保持答题卡的整洁和平整。

书写工整，涂改规范。

书写分点5分。

I卷（共95分）一. 听力（共两节，满分15分）【试卷原题型】二. 单项选择（共20小题，每小题1分，满分20分）【题型】单项选择16. The disaster is so serious that the people in that area really have a lot of difficulty ________ with their lives.A. with goingB. to go onC. going onD. in going17. There is a new problem involved in the popularity of private cars ________ road conditions need ________.A. that; to be improvedB. which; to be improvedC. where; improvingD. when; improving18. ---- Why didn’t she ask for help at that time?---- You know, at such a midnight, there was no one ________.A. She could turn toB. for whom to turnC. who to turn toD. for her to turn19. The reason ________ at the meeting for being late was not reasonable.A. Why he gaveB. what he gaveC. he gaveD. on which he gave20. I want to use the same tools ________ used in your factory a few days ago.A. as wasB. which wasC. as wereD. which21. ________ you have seen things like these before doesn’t matter.A. IfB. WhetherC. WhatD. When22. That was the first time I ________ there and I was impressed by the friendly people very much.A. goB. was goingC. had goneD. have gone23. A group of ________ are eating ________ and ________ at the foot of the hill.A. deer; grass; leafB. deer; grass; leavesC. deers; grasses; leafD. deer; grasses; leaves24. Niki is always full of ideas, but ________ is useful to my knowledge.A. nothingB. no oneC. neitherD. none25. The ________ an object is from us, the ________ it looks.A. farther; lessB. further; smallerC. farther away; smallerD. farthest away; smallest26. The bank is reported ________ in the evening newspaper yesterday.A. being robbingB. to be robbedC. having been robbedD. to have been robbed27. ---- The singer together with her band ________ invited to the concert. Did you enjoy that part?---- No, no sooner ________ than they sang their top hit Another Way to Die.A. was; I had leftB. were; I have goneC. was; had I leftD. were; did I leave28. To ret urn to the problem of water pollution, I’d like you to look at a study ________ in Australia in 2012.A. having conductedB. to be conductedC. conductingD. conducted29. The general at last got a chance to visit the village ________ he used to fight, ________ he had been dreaming of for years.A. that; whichB. where; thatC. in which; whatD. where; which30. With no arrangements reached, the leaders in the six-side talks will spend another two hours, ________ in the hotel, discussing the nuclear problem of North Korea.A. lockingB. having lockedC. lockedD. being locked31. The other day I went past an ancient tower, on ________ roof sat a very beautiful bird I had never seen before.A. whichB. whereC. whoseD. whom32. The photo was taken ________ stood the famous statue, a landmark of the city he paid a visit last July.A. whichB. in whichC. whereD. what33. Perseverance is a kind of quality and that’s ________ it takes to do anything successfully.A. howB. whichC. whereD. what34. In many ways, the education system in the US is not very different from ________ in the UK.A. thatB. whatC. oneD. it35. Since the gallery ________ after the brilliant artist was built in honor of his great contribution, it is open to the public for free the whole year.A. being nameB. namedC. to nameD. to be named【参考答案】16-20 CAACC 21-25 BCBDC 26-30 DCDDC 31-35 CCDAB【试卷原题型】三. 阅读理解（共20小题，每小题2分，满分40分）第一节（共15小题；每小题2分，满分30分）【题型】阅读理解AGetting a GrantWho Pays?The Local Education Authority ( LEA) for the area in which the student is living.Who Can Get the Money?Anyone who gets a place on a first-degree course, although a student who has already attended acourse of advanced further education may not. Students must also have been resident(常住的) in theUK for at least three years, which can exclude(排除) some students from overseas.Special ClassesIf a Student Has Studied in a College?A student who is 26 0r more before the course starts and who has worked for at least three of theprevious(早先的)six years will get extra money $ 155 a year at 26, increasing to a maximum (最多的)of $ 615 at 29 or more.If a Student Is Handicapped?LEAs will give up to $ 500 to help meet extra expenses-such as buying a tape recorder for blind students, extra heating or special food.Banking?Most of the big banks offer special services to students who open accounts(账户) (in the hope thatthey will stay with the bank when they become rich officials). A student won't usually have to pay bankcharges as long as the account stays in credit (信用). Some banks allow students to overdraw by $ 100or so, and still don't make charges (though they do charge interest).36. The underlined phrased phrase “a grant”in the title most probably means ________.A. bank interestB. a credit cardC. financial aidD. an education fee37. A 31-year-old nurse wishes to qualify as a doctor at a university. She has worked since she was 25. How much extra money will she get a year?A. None.B. $ 155.C. $515.D. $615.38. A big bank offers a new student special services because ________.A. they need student accounts badlyB. they charge students extra interestC. they hope he’ll be a potential customerD. they know he can get money regularly【参考答案】36-38 CDCB（2016四川高考D篇）A warm drink of milk before bed has long been the best choice for those wanting a good night’s sleep. But now a study has found it really does help people nod off—if it is milked from a cow at night.Researchers have discovered that “night milk” contains more melatonin(褪黑激素), which has been proven to help people feel sleepy and reduce anxiety.The study, by researchers from Seoul, South Korea, involved mice being fed with dried milk powder made from cows milked both during the day and at night.Those given night milk, which contained 10 times the amount of melatonin, were less active and less anxious than those fed with the milk collected during daytime, according to the study published in The Journal of Medicinal Food.Night milk quickened the start of sleep and caused the mice to sleep longer.While the effect of cows milk harvested at different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who are struggling to fall asleep at night.Previous studies have also indicated that milk can be excellent for helping sleep because of the calcium content, which helps people to relax.Milk is also sugar-free and additive-free with nutritionists recommending skimmed milk as the best choice before bed as it is the least fattening. The more fat you take in before bedtime, the greater burden you will put on your body at night.39. According to the text, the mice fed with daytime milk_______.A. started sleep more easilyB. were less activeC. were more anxiousD. woke up later40. Which of the following is TRUE of melatonin according to the text?A. It’s used in sleeping drugs.B. It exists in milk in great amount.C. It can make people more energetic.D. It’s been tested on mice for ten years.41. What can be a suitable title for the text?A. Milk Drinking and HealthB. Fat, Sugar and HealthC. An Experiment on MiceD. Night Milk and Sleep42. How does the author support the theme of the text?A. By giving examples.B. By providing research results.C. By explaining statistical data.D. By stating arguments.【参考答案】39-42 CADBCEvery April I am troubled by the same concern-that spring might not occur this year. he landscape looks dull, with hills, sky and forest appearing gray. My spirits ebb, as they did during an April snowfall when I first came toMaine 15 years ago. "Just wait," a neighbor advised. "You'll wake up one morning and spring will just be here."And look, on May 3 that year I awoke to a green so amazing as to be almost electric, as if spring were simply a matter of flipping a switch. Hills, sky and forest revealed their purples, blues and green. Leaves had unfolded and daffodils were fighting their way heavenward.Then there was the old apple tree. It sits on an undeveloped lot in my neighborhood. It belongs to no one and therefore to everyone. The tree's dark twisted branches stretch in unpruned (未经修剪的)abandon. Each spring it blossoms so freely that the air becomes filled with the scent of apple.Until last year, I thought I was the only one aware of this tree. And then one day, in a fit of spring madness, I set out with pruner to remove a few disorderly branches. No sooner had I arrived under its boughs than neighbors opened their windows and stepped onto their porches. These were people I barely knew and seldom spoke to, but it was as if I had come uninvited into their personal gardens.My mobile-home neighbor was the first to speak. "You're not cutting it down, are you" Another neighbor frowned as I cut off a branch. "Don't kill it, now," he cautioned.Soon half the neighborhood had joined me under the apple tree. It struck me that I had lived there for five years and only now was learning these people's names, what they did for a living and how they passed the winter. It was as if the old apple tree gathering us under its boughs for the dual purpose of acquaintanceship and shared wonder. I couldn't help recalling Robert Frost's words:The trees that have it in their pent-up budsTo darken nature and be summer woodsOne thaw(融雪期) led to another. Just the other day I saw one of my neighbors at the local store. He remarked how this recent winter had been especially long and complained of not having seen or spoken at length to anyone in our neighborhood. And then, he looked at me and said, "We need to prune that apple tree again."43. By saying that “my spirits ebb” (Para 1), the author means that _______.A. he feels blueB. he feels relievedC. he is surprisedD. he is tired44. The apple tree mentioned in the passage is most likely to ________.A. have been abandoned by its original ownerB. be regarded as a delight in the neighborhoodC. have been neglected by everyone in the communityD. be appealing only to the author45. According to Para.4, why did the neighbors open their windows and step onto their porches?A. they were surprised that someone unknown was pruning the tree.B. they wanted to prevent the author from pruning the tree.C. they were concerned about the safety of the tree.D. they wanted to get to know the author46. It can be inferred that author’s neighbor mentioned in the last paragraph most cared about _____.A. the neighborhood gatheringB. how to pass the long winterC. when spring would arriveD. the pruning of the apple tree【参考答案】43-46 ABCADTaste is such a subjective matter that we don’t usually conduct preference tests for food. The most you can say about anyone’s preference is that it’s one person’s opinion. But because the two big cola companies—Coca-Cola and Pepsi Cola are marketed so aggressively, we’ve wondered how big a role taste preference actually plays in brand loyalty. We set up a taste test that challenged people who identified themselves as either Coca-Cola or Pepsi fans: Find your brand in a blind tasting.We invited staff volunteers who had a strong liking for either Coca-Cola or Pepsi, Diet Coke, or Diet Pepsi. These were people who thought they’d have no trouble telling their brand from the other brand.We eventually located 19 regular cola drinkers and 27 diet cola drinkers. Then we fed them four unidentifiedsamples of cola one at a time, regular colas for the one group, diet versions for the other. We asked them to tell us whether each sample was Coke or Pepsi; then we an alyzed the records statistically to compare the participants’ choices with what mere guess-work could have accomplished.Getting all four samples right was a tough test, but not too tough, we thought, for people who believed they could recognize their brand. In the end, only 7 out of 19 regular cola drinkers correctly identified their brand of choice in all four trials. The diet-cola drinkers did a little worse----only 7 of 27 identified all four samples correctly.While both groups did better than chance would predict, nearly half the participants in each group made the wrong choice two or more times. Two people got all four samples wrong. Overall, half the participants did about as well on the last round of tasting as on the first, so tiredness, or taste burnout, was not a factor. Our preference test results suggest that only a few Pepsi participants and Coke fans may really be able to tell their favorite brand by taste and price.47. According to the passage the preference test was conducted in order to ________.A．show that a person’s opinion about taste is mere guess-workB．show which cola is more to the liking of the drinkersC．find out the role taste preference plays in a person’s choice of drinkingD．compare the ability of the participants in choosing their drinks48. It is implied but not stated in the first paragraph that ________.A．the competition between the two colas is very strongB．the improvement of quality is the chief concern of the two cola companiesC．the purpose of taste tests is to promote the sale of colasD．blind tasting is necessary for identifying fans49. The statistics recorded in the preference tests show that ________.A. Coca-Cola and Pepsi are people’s two favorite drinksB. few people had trouble telling Coca-Cola from PepsiC. people’s tastes differ from one anotherD. there is not much difference in taste between Coca-Cola and Pepsi50. The author’s purpose in writing this passage is to ________.A．argue that taste testing is an important marketing strategyB．show that taste preference is highly subjectiveC．emphasize that taste and price are closely related to each otherD．recommend that blind tasting be introduced in the quality control of colas【参考答案】47-50 CADB【试卷原题型】第二节七选五（共5小题；每小题2分，满分10分）【题型】七选五Lost in the PostHow would you feel if the letter you penned carefully and posted to your favorite star ended up in the recycling bin? That's where unopened fan mail sent to singer Taylor Swift was found in Nashville. ___51___ Swift’s management said it was an accident, but dealing with piles of letters is a burden for most public figures. According to the BBC reporter Jon Kelly, at the height of his fame, Johnny Depp was said to receive up to 10,000 letters a week. ___52___The dawn of the digital age in which public figures with a Twitter account can be messaged directly has made the process easier. The White House says it deals with 20,000 messages addressed to President Barack Obama each day.Some celebrities don’t want letters. In 2008, Beatles drummer Ringo Starr said that he would throw them out because he was too busy. ___53___ Robert Pattinson, star of the Twilight films, claims that he reads tonnes and tonnes of letters from fans, which takes up almost all his free time.Many artists, however, outsource(外包) the task of opening, reading and replying. Sylvia “Spanky” Taylor, 58, has run a service in California that does just that since 1987. ___54___ Most letters are simply declarations of affection and admiration, she says. A few ask for money. A small number contain threats which require her to contact the celebrity’s security team and law enforcement.The biggest problem for Taylor is working out how to deal with the correspondence(通信). Presents such as soft toys are sent to local hospitals, and most of the letters just get shredded and recycled.___55___ For some, this is enough, according to Lynn Zubernis, an expert at West Chester University. She says that the relationship between fan and celebrity may exist only in the mind of the former but it comes from a deeply-rooted human need for community.A. This incident has caused a wide public concern about how the public figures deal with the letters or mails from the fans.B. She and her staff deal with up to 20,000 items of mail a month on behalf of 26 celebrities.C. Accordingly, the correspondence problem has been difficult for the computer to automate.D. Typically, correspondence is acknowledged by a photo with a printed “signature”.E. How could he have enough time to skim through these letters one by one?F. In fact, there is no alternative to deal with the problem.G. Others do attempt to get through it themselves.【答案】51-55．AEGBD【考点】信息匹配阅读还原句子【解析】51. 根据前面一句中出现的some，可知此句中会出现others，因为这是一个句型。

山东威海经济技术开发区2016-2017学年八年级（五四学制）下学期期中考试语文试卷部编人教版九年级总复习2016—2017学年度第二学期期中质量检测初三语文（卷面5分）一、积累与运用（23分）1、下列词语中加点字的注音无误的一项是（）（3分）A搓捻（niǎn）旁骛（wù）扶掖（yè）觅食（nì）B谀词（y ú）一抔黄土（pó）忐忑（tè）怒不可遏（è）C宽恕（shù）鬃毛（zōng）重蹈覆辙（dǎo）侏儒（rú） D亵渎（xiè）赋予（fù）诬蔑（miè）文绉绉(zōu)2、请找出下列词语中的四个错别字，在错字下面划横线，在田字格中订正。

（4分）油光可鉴毫不妥协翻来复去正襟危坐诚皇诚恐暗然失色强聒不舍断章取意3、根据提示，用古诗文填空。

（8分）（1）浊酒一杯家万里，。

，，将军白发征夫泪。

（2）。

，又何妨！持节云中，。

（3），，沙场秋点兵。

（4），万方多难此登临。

锦江春色来天地，。

（5），，知汝远来应有意，好收吾骨瘴江边。

（6），。

共看明月应垂泪，一夜乡心五处同。

（7）马毛带雪汗气蒸，，。

4、名著（2）《傅雷家书》是一本普通而又奇特的书。

傅雷用自己的经历现身说法，教导儿子待人要谦虚，做事要严谨，礼仪要得体，做一个、的艺术家。

5、仿写句子（2分）友谊如珍珠，我们共同穿缀，联成一串串璀璨的项链；友谊如彩绸，我们共同剪裁，缝制一件件绚丽的衣衫；，，。

6、.综合性学习【4分】2013年1月16日，由腾讯微博认证用户徐侠客首先发起“光盘行动”，倡导网友珍惜粮食，加入行动，请你也加入其中：（1）拟写一条公益广告张贴在班级，提倡节约【2分】（2）光盘行动得到许多网友支持，模仿下面微信，也发一条微信谈谈自己的看法。

【2分】示例：“一江春水”：加入“光盘族”吧，我们都不要浪费，尊重农民的劳动成果。

山东省烟台市2017-2018年初二数学第二学期期中考试试题一、选择题（每题3分，共36分）1、已知一次函数过（-1，5）和（3，1）这两点，则其解析式为（）A. y=-x+1B. y=x+5C. y=-x+4D. y=x-42、下列事件中，是必然事件的是（）A.购买一张彩票，中奖B. 通常温度降到0℃以下，纯净的水会结冰C. 明天一定是晴天D. 经过有交通信号灯的路口，遇到红灯3、“yi dai yi lu（一带一路）”这句话中，字母“i”出现的频率是（）A. 2B. 29C.13D.144、下列命题是假命题的是（）A.若a b=，则a=b B. 两条直线平行，同位角相等C. 对顶角相等D. 若x=2，y=3，则2x-3y=-55、如果三角形三个内角的度数之比为3:4:5，那么这个三角形一定是（）A. 钝角三角形B. 锐角三角形C. 直角三角形D. 以上都不对6、已知方程组5354x yax y+=⎧⎨+=⎩与5125x byx y+=⎧⎨-=⎩有相同的解，则a，b的值为（）A.12ab=⎧⎨=⎩B.46ab=-⎧⎨=-⎩C.62ab=-⎧⎨=⎩D.142ab=⎧⎨=⎩7、一个两位数，十位数字比个位数字的2倍大1，若将这个两位数减去36恰好等于个位数字与十位数字对调后所得的两位数，则这个两位数是（）A. 52B. 68C. 94D. 738、如图所示是由截面为同一种矩形的墙砖粘贴的部分墙面，其中三块横放的墙砖比一块竖放的墙砖高10cm，两块横放的墙砖比两块竖放的墙砖低40cm，则每块墙砖的截面面积是（）A. 425cm2B. 525cm2C. 600cm2D. 800cm29、如图，已知a∥b，小华把三角板的直角顶点放在直线b上．若∠1=40°，则∠2的度数为（）A. 100°B. 110°C. 120°D. 130°10、若关于x、y的方程组3x pyx y+=⎧⎨+=⎩的解是1xy=⎧⎨=∆⎩，其中y的值被覆盖住了，不过仍能求出P，则P的值是（）A.12- B.12C.14- D. 1411、《九章算术》是中国古代的数学专著，下面这道题是《九章算术》中第七章的一道题：“今有共买物，人出八，盈三；人出七，不足四，问人数、物价各几何？”译文：“几个人一起去购买某物品，如果每人出8钱，则多了3钱；如果每人出7钱，则少了4钱．问有多少人，物品的价格是多少？”设有x人，物品价格为y钱，可列方程组为（）A.8374x yx y+=⎧⎨-=⎩B.8374x yx y-=⎧⎨+=⎩C.8374y xy x-=⎧⎨-=⎩D.8374x yx y-=⎧⎨-=⎩12、已知一次函数y=x+1和y=ax+3的图象交于点P，点P的横坐标为1，则关于x、y的方程组13x yax y-=-⎧⎨-=-⎩的解是（）A.12xy=⎧⎨=-⎩B.21xy=⎧⎨=⎩C.12xy=⎧⎨=⎩D.21xy=-⎧⎨=⎩二、填空题（每题3分，共18分）13、“等角的补角相等”的条件是，结论是 .14、一个不透明的袋中装有除颜色外均相同的5个红球和n 个黄球，从中随机摸出一个球，摸到红球的概率是58，则n = .15、如图，∠BDE=∠EBD ，要使AB ∥DE ，则针对线段BD 应添加的条件是 .（填一个即可）16、若方程组43235x y kx y -=⎧⎨+=⎩中，x 和y 的值相等，则k = .17、如图是婴儿车的平面示意图，其中AB ∥CD ，∠1=130°，∠3=40°，那么∠2的度数为 .18、在矩形ABCD 中放入六个长、宽都相同的小长方形，所标尺寸如图所示，则图中阴影部分的面积是 cm2. 三、解答题19、（8分）某地要考察一种树苗的成活率，对该地区这种树苗移植情况进行调查统计，并绘制了如图所示的统计表，根据统计图提供的信息解决下列问题：（1）这种树苗成活的频率稳定在 ，成活的概率估计值为_____； （2）该地区已经移植这种树苗5万棵， ①估计这种树苗成活棵数；②如果该地区计划成活18万棵这种树苗，那么还需移植这种树苗约多少棵？ 20、（8分）某快递公司有甲、乙两个仓库，各存有快件若干件，甲仓库发走80件后余下的快件数比乙仓库原有快件数的2倍少700件；乙仓库发走560件后剩余的快件数是甲仓库余下的快件数的15还多210件，求甲、乙两个仓库原有快件各多少件？21、（8分）如图，在3×3的方阵图中，填写了一些数和代数式（其中每个代数式都表示一个数），使得每行的3个数、每列的3个数、斜对角的3个数之和均相等.（1）求x，y的值；（2）在备用图中完成此方阵图.22、（8分）根据下列语句，设适当的未知数，列出二元一次方程组：（1）某学校招收七年级学生292人，其中男生人数比女生人数多35人；（2）某时装的价格是某皮衣价格的1.4倍，5件皮衣要比3件时装贵2800元. 23、（8分）如果将二元一次方程组233x yx y+=⎧⎨+=⎩中第一个方程y的系数遮住，第二个方程中x的系数遮住，并且21xy=⎧⎨=⎩是这个方程组的解，你能求出原来的方程组吗？24、（8分）如图，已知∠1=∠BDC，∠2+∠3=180°．请你判断AD与EC的位置关系，并说明理由；（2）若DA平分∠BDC，CE⊥AE于E，∠1=70°，试求∠FAB的度数．25、（9分）学生在素质教育基地进行社会实践活动，帮助农民伯伯采摘了黄瓜和茄子共80千克，了解到这些蔬菜的种植成本共180元，还了解到如下信息：求采摘的黄瓜和茄子各多少千克？（2）这些采摘的黄瓜和茄子可赚多少元？26、（9分）某商场欲购进一种商品，当购进这种商品至少为10kg，但不超过30kg时，成本y（元/kg）与进货量x（kg）的函数关系如图所示．求y关于x的函数解析式，并写出x的取值范围．（2）若该商场购进这种商品的成本为9.6元/kg，则购进此商品多少千克？2017-2018学年度第二学期期中学业水平考试初二数学答案一、选择题（本题共12个小题，每小题3分，满分36分）每小题都给出标号为A，B，C，D四个备选答案，其中有且只有一个是正确的).CBCAB DDBDA BC二、填空题（本题共6个小题，每小题3分，满分18分）13.两角相等，两角的补角相等 14. 3 15. BD为ABC∠的平分线16. 1 17. o90 18. 33三、解答题（本大题共8个小题，满分66分，解答应写出文字说明，证明过程或演算步骤）19.解：（1）9.09.0┄┄┄┄┄┄┄┄┄ 4分（2）① 4.5万棵┄┄┄┄┄┄┄┄┄ 6分②设为x万棵，则9.0)5(18⨯+=x解得15=x，答：还需要种植15万棵┄┄┄┄┄┄┄┄┄ 8分20.解：设甲仓库存有快件x件，乙仓库存有快件y件由题意知⎪⎩⎪⎨⎧+-=--=-210)80(51560700280xyyx┄┄┄┄┄┄┄┄┄ 3分解之得⎩⎨⎧==10501480yx┄┄┄┄┄┄┄┄┄ 6分答：甲仓库存有快件1480件，乙仓库存有快件1050件. ┄┄┄ 8分21．解：(1)由题意得⎩⎨⎧-++=++-+-=++xyyxxxyx24322343解之得⎩⎨⎧=-=21yx，代入原方阵图得⎩⎨⎧==16ba┄┄┄┄┄┄┄┄┄ 4分(2)┄┄┄┄┄┄┄┄┄ 8分22. 解：（1）设男生人数为x,女生人数为y则⎩⎨⎧+==+35292yxyx┄┄┄┄┄┄┄┄┄ 4分24题图(2) 设时装的价格为x 元,某皮衣价格为y 元则⎩⎨⎧+==2800354.1x y yx ┄┄┄┄┄┄┄┄┄ 8分23.解：设第一个方程中y 的系数为a ，第二个方程中x 的系数为b将代入得⎩⎨⎧=+=+31234b a 解之得┄┄┄┄┄┄┄┄┄ 3分⎩⎨⎧=-=11b a ┄┄┄┄┄┄┄┄┄ 6分 原方程组为⎩⎨⎧=+=-332y x y x ┄┄┄┄┄┄┄┄┄ 8分 24.解：（1）AD 与EC 平行因为∠1=∠BDC ，CD AB // 2∠=∠ADC∠2+∠3=180o1803=∠+∠ADC 所以EC AD //┄┄┄┄┄┄┄┄┄ 4分 (2) DA 平分BDC ∠, 2∠=∠=∠CDA BDA221∠=∠, o352=∠ AE CE ⊥于E ,o90=∠FAD oo o 553590=-=∠FAB ┄┄┄┄┄┄┄┄┄ 8分 25.解：（1）设采摘的黄瓜x 千克，茄子y 千克由题意知80302 2.418050x y x x y y +==⎧⎧⎨⎨+==⎩⎩┄┄┄┄┄┄┄┄┄ 3分 采摘的黄瓜30千克，茄子50千克┄┄┄┄┄┄┄┄┄ 5分（2）（3-2）×30+（4-2.4）×50=30+80=110（元）， 答：采摘的黄瓜和茄子可赚110元．┄┄┄┄┄┄┄ 9分26.解：(1)设b ax y +=由题意可知⎩⎨⎧+=+=b a b a 3081010解之得⎩⎨⎧=-=111.0b a ┄┄┄┄┄┄┄┄┄ 3分 111.0+-=x y )3010(≤≤x ┄┄┄┄┄┄┄┄┄ 5分 (2) 6.9=y 代入111.0+-=x y 111.06.9+-=x解之得14=x (千克)若该商场购进这种商品的成本为9.6元 /kg,则购进此商品14千克┄┄┄┄┄ 9分。