安徽省合肥市瑶海区安徽第五十五中学2019-2020学年第一学期期中考试 九年级物理(图片版 无答案)
安徽省合肥5中2019-2020学年九年级(上)期中数学试卷(含答案)
九年级（上）期中数学试卷一．选择题（每题4分，满分40分）1．抛物线y＝x2+2x+3的对称轴是（）A．直线x＝1B．直线x＝﹣1C．直线x＝﹣2D．直线x＝22．若，则的值为（）A．B．C．D．3．若反比例函数y＝﹣的图象上有两个不同的点关于y轴的对称点都在一次函数y＝﹣x+m 的图象上，则m的取值范围是（）A．m＞2B．m＜﹣2C．m＞2或m＜﹣2D．﹣2＜m＜24．抛物线y＝x2+6x+7可由抛物线y＝x2如何平移得到的（）A．先向左平移3个单位，再向下平移2个单位B．先向左平移6个单位，再向上平移7个单位C．先向上平移2个单位，再向左平移3个单位D．先向右平移3个单位，再向上平移2个单位5．已知反比例函数y＝﹣，下列结论中不正确的是（）A．图象必经过点（﹣3，2）B．图象位于第二、四象限C．若x＜﹣2，则0＜y＜3D．在每一个象限内，y随x值的增大而减小6．已知P为线段AB的黄金分割点，且AP＞PB，则（）A．AP2+BP2＝AB2B．BP2＝AP•ABC．AP2＝AB•BP D．AB2＝AP•PB7．如图，取一张长为a，宽为b的长方形纸片，将它对折两次后得到一张小长方形纸片，若要使小长方形与原长方形相似，则原长方形纸片的边a、b应满足的条件是（）A．a＝b B．a＝2b C．a＝2b D．a＝4b8．如图，在平面直角坐标系xOy中，直线y＝k1x+2与y轴交于点C，与反比例函数y＝在第一象限内的图象交于点B，连接BO，若S＝1，tan∠BOC＝，则k2的值是（）△OBCA．﹣3B．1C．2D．39．抛物线y＝ax2+bx+3（a≠0）过A（4，4），B（2，m）两点，点B到抛物线对称轴的距离记为d，满足0＜d≤1，则实数m的取值范围是（）A．m≤2或m≥3B．m≤3或m≥4C．2＜m＜3D．3＜m＜410．如图，矩形ABCD中，AB＝1，BC＝2，点P从点B出发，沿B→C→D向终点D匀速运动，设点P走过的路程为x，△ABP的面积为S，能正确反映S与x之间函数关系的图象是（）A．B．C．D．二．填空题（满分20分，每小题5分）11．已知，那么m ：n ＝ ．12．如图是抛物线型拱桥，当拱顶离水面2m 时，水面宽4m ．水面下降2.5m ，水面宽度增加 m ．13．如图，点A 在双曲线y ＝（x ＞0）上，点B 在双曲线y ＝（x ＞0）上，且AB ∥x 轴，BC ∥y 轴，点C 在x 轴上，则△ABC 的面积为 ．14．已知抛物线y ＝ax 2+4ax +4a +1（a ≠0）过点A （m ，3），B （n ，3）两点，若线段AB 的长不大于4，则代数式a 2+a +1的最小值是 ． 三．解答题15．（8分）已知抛物线y ＝a （x ﹣3）2+2经过点（1，﹣2）． （1）求a 的值．（2）若点A （m ，y 1），（n ，y 2）（m ＜n ＜3）都在该抛物线上，试比较y 1与y 2的大小． 16．（8分）如图，二次函数y ＝（x ﹣3）2+m 的图象与y 轴交于点C ，点B 是点C 关于该二次函数图象的对称轴对称的点，已知一次函数y ＝kx +b 的图象经过该二次函数图象上的点A （1，0）及点B ．（1）求二次函数与一次函数的解析式；（2）抛物线上是否存在一点P ，使S △ABP ＝S △ABC ？若存在，请求出点P 的坐标，若不存在，请说明理由．四．解答题17．（8分）如图，已知梯形ABCD中，EF∥AD∥BC，点E、F分别在腰AB、DC上，AE ＝3，EB＝5．（1）求的值；（2）当AD＝4，BC＝12时，求EF的长．18．（8分）如图，l1∥l2∥l3，AB＝3，AD＝2，DE＝4，EF＝7.5．求BC、BE的长．五．解答题19．（10分）请你利用直角坐标平面上任意两点（x1，y1）、（x2，y2）间的距离公式解答下列问题：已知：反比例函数与正比例函数y＝x的图象交于A、B两点（A在第一象限），点F1（﹣2，﹣2）、F2（2，2）在直线y＝x上．设点P（x0，y0）是反比例函数图象上的任意一点，记点P与F1、F2两点的距离之差d＝|PF1﹣PF2|．试比较线段AB的长度与d的大小，并由此归纳出双曲线的一个重要定义（用简练的语言表述）．20．（10分）有一个二次函数满足以下条件：①函数图象与x轴的交点坐标分别为A（1，0），B（x2，y2）（点B在点A的右侧）；②对称轴是x＝3；③该函数有最小值是﹣2．（1）请根据以上信息求出二次函数表达式；（2）将该函数图象x＞x2的部分图象向下翻折与原图象未翻折的部分组成图象“G”，平行于x轴的直线与图象“G”相交于点C（x3，y3）、D（x4，y4）、E（x5，y5）（x3＜x4＜x5），结合画出的函数图象求x3+x4+x5的取值范围．六．解答题21．（12分）某商场将每台进价为3000元的彩电以3900元的销售价售出，每天可销售出6台，这种彩电每台降价100x（x为整数且0＜x＜9）元，每天可以多销售出3x台．（1）降价后每台彩电的利润是元，每天销售彩电台，设商场每天销售这种彩电获得的利润为y元，试写出y与x之间的函数关系式．（2）为了使顾客得到实惠，每台彩电的销售价定为多少时，销售该品牌彩电每天获得的利润最大，最大利润是多少？七．解答题22．（12分）小芳从家骑自行车去学校，所需时间y（min）与骑车速度x（m/min）之间的反比例函数关系如图．（1）小芳家与学校之间的距离是多少？（2）写出y与x的函数表达式；（3）若小芳7点20分从家出发，预计到校时间不超过7点28分，请你用函数的性质说明小芳的骑车速度至少为多少？八．解答题23．（14分）如图，抛物线y＝x2+bx+c与直线y＝x﹣3交于，B两点，其中点A在y轴上，点B坐标为（﹣4，﹣5），点P为y轴左侧的抛物线上一动点，过点P作PC⊥x轴于点C，交AB于点D．（1）求抛物线对应的函数解析式；（2）以O，A，P，D为顶点的平行四边形是否存在若存在，求点P的坐标；若不存在，说明理由．参考答案一．选择题1．解：∵y＝x2+2x+3＝（x+1）2+2，∴抛物线的对称轴为直线x＝﹣1．故选：B．2．解：因为，所以b＝，把b＝代入则＝，故选：B．3．解：∵反比例函数y＝﹣的图象上有两个不同的点关于y轴的对称点在反比例函数y＝的图象上，∴解方程组得x2﹣mx+2＝0，∵y＝的图象与一次函数y＝﹣x+m有两个不同的交点，∴方程x2﹣mx+2＝0有两个不同的实数根，∴△＝m2﹣8＞0，∴m＞2或m＜﹣2，故选：C．4．解：因为y＝x2+6x+7＝（x+3）2﹣2．所以将抛物线y＝x2先向左平移3个单位，再向下平移2个单位即可得到抛物线y＝x2+6x+7．故选：A．5．解：A、图象必经过点（﹣3，2），故A正确；B、图象位于第二、四象限，故B正确；C、若x＜﹣2，则y＜3，故C正确；D、在每一个象限内，y随x值的增大而增大，故D正确；故选：D．6．解：∵P为线段AB的黄金分割点，且AP＞PB，∴AP2＝AB•BP．故选：C．7．解：对折两次后的小长方形的长为b，宽为a，∵小长方形与原长方形相似，∴＝，∴a＝2b．故选：B．8．解：∵直线y＝k1x+2与x轴交于点A，与y轴交于点C，∴点C的坐标为（0，2），∴OC＝2，过B作BD⊥y轴于D，∵S＝1，△OBC∴BD＝1，∵tan∠BOC＝，∴＝，∴OD＝3，∴点B的坐标为（1，3），∵反比例函数y＝在第一象限内的图象交于点B，∴k2＝1×3＝3．故选：D．9．解：把A（4，4）代入抛物线y＝ax2+bx+3得：16a+4b+3＝4，∴16a+4b＝1，∴4a+b＝，∵对称轴x＝﹣，B（2，m），且点B到抛物线对称轴的距离记为d，满足0＜d≤1，∴∴，∴||≤1，∴或a，把B（2，m）代入y＝ax2+bx+3得：4a+2b+3＝m2（2a+b）+3＝m2（2a+﹣4a）+3＝m﹣4a＝m，a＝，∴或，∴m≤3或m≥4．故选：B．10．解：由题意知，点P从点B出发，沿B→C→D向终点D匀速运动，则当0＜x≤2，s＝，当2＜x≤3，s＝1，由以上分析可知，这个分段函数的图象开始直线一部分，最后为水平直线的一部分．故选：C．二．填空题（共4小题，满分20分，每小题5分）11．解：设n＝3k，2m﹣n＝k，则m＝2k，∴m ：n ＝2k ：3k ＝2：3．12．解：建立平面直角坐标系，设横轴x 通过AB ，纵轴y 通过AB 中点O 且通过C 点，则通过画图可得知O 为原点，抛物线以y 轴为对称轴，且经过A ，B 两点，OA 和OB 可求出为AB 的一半2米，抛物线顶点C 坐标为（0，2），通过以上条件可设顶点式y ＝ax 2+2，其中a 可通过代入A 点坐标（﹣2，0）， 到抛物线解析式得出：a ＝﹣0.5，所以抛物线解析式为y ＝﹣0.5x 2+2， 当水面下降2米，通过抛物线在图上的观察可转化为：当y ＝﹣2时，对应的抛物线上两点之间的距离，也就是直线y ＝﹣2与抛物线相交的两点之间的距离，可以通过把y ＝﹣2代入抛物线解析式得出： ﹣2.5＝﹣0.5x 2+2，解得：x ＝±3，所以水面宽度增加到6米，比原先的宽度当然是增加了6﹣4＝2米， 故答案为：2．13．解：作AE ⊥x 轴于E ，BF ⊥x 轴于F ，延长BA 交y 轴于点D ，如图， ∵AB ∥x 轴，∴S 矩形AEOD ＝1，S 矩形BFOD ＝4， ∴S 矩形AEFB ＝4﹣1＝3， ∴S △F AB ＝1.5， ∴S △ABC ＝S △F AB ＝1.5． 故答案为1.5．14．解：∵抛物线y＝ax2+4ax+4a+1＝a（x+2）2+1（a≠0），∴顶点为（﹣2，1），过点A（m，3），B（n，3）两点，∴a＞0，∴对称轴为直线x＝﹣2，线段AB的长不大于4，∴4a+1≥3∴a≥∴a2+a+1的最小值为：（）2++1＝；故答案为．三．解答题（共2小题，满分16分，每小题8分）15．解：（1）∵抛物线y＝a（x﹣3）2+2经过点（1，﹣2），∴﹣2＝a（1﹣3）2+2，∴a＝﹣1；（2）∵y＝﹣（x﹣3）2+2，∴此函数的图象开口向下，当x＜3时，y随x的增大而增大，当x＞3时，y随x的增大而减小，∵点A（m，y1），（n，y2）（m＜n＜3）都在该抛物线上，∴y1＜y2．16．解：（1）将点A（1，0）代入y＝（x﹣3）2+m得（1﹣3）2+m＝0，解得m＝﹣4．所以二次函数解析式为y＝（x﹣3）2﹣4，即y＝x2﹣6x+5；当x＝0时，y＝9﹣4＝5，所以C点坐标为（0，5），由于C和B关于对称轴对称，而抛物线的对称轴为直线x＝3，所以B点坐标为（6，5），将A（1，0）、B（6，5）代入y＝kx+b得，，解得：．所以一次函数解析式为y＝x﹣1；（2）假设存在点P，设点P（a，a2﹣6a+5），∵S△ABP ＝S△ABC，∵，如图1，当点P在直线AB的下方时，过点P作PE∥y轴交直线AB于点E，∴＝15，∴E（a，a﹣1）∴PE＝﹣a2+7a﹣6，∴，∴a2﹣7a+12＝0解得：a1＝4，a2＝3，∴P1（3，﹣4），P2（4，﹣3），如图2，当点P在直线AB的上方时，过点P作PF∥y轴交直线AB于F，同理可得＝15，∴，解得a＝0（舍去），a＝7，∴P3（7，12）．综合以上可得P点坐标为（3，﹣4）或（4，﹣3或）（7，12）．四．解答题（共2小题，满分16分，每小题8分）17．解：（1）∵EF∥AD∥BC，∴，∵AE＝3，EB＝5，∴＝；（2）连接AC，∵EF∥AD∥BC，∴，∴＝，∴EG＝，同理可得：＝，∵，∴＝，∴＝，∴GF＝，∴EF＝EG+GF＝7．18．解：∵l1∥l2∥l3，∴＝＝，即＝＝，∴BC＝6，BF＝BE，∴BE+BE＝7.5，∴BE＝5．五．解答题（共2小题，满分20分，每小题10分）19．解：解由和y＝x组成的方程组可得A、B两点的坐标分别为，（，）、（，），线段AB的长度＝4（2分）∵点P（x0，y0）是反比例函数图象上一点，∴y0＝∴PF1＝＝＝||，PF2＝＝＝||，（3分）∴d＝|PF1﹣PF2|＝|||﹣|||，当x0＞0时，d＝4；当x0＜0时，d＝4．（3分）因此，无论点P的位置如何，线段AB的长度与d一定相等．（2分）由此可知：到两个定点的距离之差（取正值）是定值的点的集合（轨迹）是双曲线．（2分）20．解：（1）由上述信息可知该函数图象的顶点坐标为：（3，﹣2）设二次函数表达式为：y＝a（x﹣3）2﹣2．∵该图象过A（1，0）∴0＝a（1﹣3）2﹣2，解得a＝．∴表达式为y＝（x﹣3）2﹣2（2）如图所示：由已知条件可知直线与图形“G”要有三个交点1当直线与x轴重合时，有2个交点，由二次函数的轴对称性可求x3+x4＝6，∴x3+x4+x5＞11．当直线过y＝（x﹣3）2﹣2的图象顶点时，有2个交点，由翻折可以得到翻折后的函数图象为y＝﹣（x﹣3）2+2∴令（x﹣3）2+2＝﹣2时，解得x＝3+2或x＝3﹣2（舍去）∴x3+x4+x5＜9+2．综上所述11＜x3+x4+x5＜9+2．六．解答题（共1小题，满分12分，每小题12分）21．解：（1）由题意得：每台彩电的利润是（3900﹣100x﹣3000）元，即（900﹣100x）元，每天销售（6+3x）台，则y＝（900﹣100x）（6+3x）＝﹣300x2+2100x+5400故答案为：（900﹣100x），（6+3x）；y与x之间的函数关系式为：y＝﹣300x2+2100x+5400．（2）y＝﹣300x2+2100x+5400．＝﹣300（x﹣3.5）2+9075当x＝3或x＝4时，y＝9000．最大值当x＝3时，彩电销售单价为3600元，每天销售15台，营业额为3600×15＝54000元，当x＝4时，彩电销售单价为3500元，每天销售18台，营业额为3500×18＝63000元，∴为了使顾客得到实惠，每台彩电的销售价定为3500元时，销售该品牌彩电每天获得的利润最大，最大利润是9000元．七．解答题（共1小题，满分12分，每小题12分）22．解：（1）小芳家与学校之间的距离是：10×140＝1400（m）；（2）设y＝，当x＝140时，y＝10，解得：k＝1400，故y与x的函数表达式为：y＝；（3）当y＝8时，x＝175，∵k＞0，∴在第一象限内y随x的增大而减小，∴小芳的骑车速度至少为175m/min．八．解答题（共1小题，满分14分，每小题14分）23．解：（1）将点A、B的坐标代入抛物线表达式得：，解得：，故抛物线的表达式为：y＝x2+x﹣3；（2）存在，理由：同理直线AB的表达式为：y＝x﹣3，设点P（m，m2+m﹣3），点D（m，m﹣3）（m＜0），则PD＝|m2+4m|，∵PD∥AO，则当PD＝OA＝3时，存在以O，A，P，D为顶点的平行四边形，即PD＝|m2+4m|＝3，①当m2+4m＝3时，解得：m＝﹣2±（舍去正值），即m2+m﹣3＝1﹣，故点P（﹣2﹣，﹣1﹣），②当m2+4m＝﹣3时，解得：m＝﹣1或﹣3，同理可得：点P（﹣1，﹣）或（﹣3，﹣）；综上，点P（﹣2﹣，﹣1﹣）或（﹣1，﹣）或（﹣3，﹣）．。
2019-2020学年安徽省合肥市瑶海区九年级(上)期中数学试卷
2019-2020学年安徽省合肥市瑶海区九年级（上）期中数学试卷一、选择题（本大題共10小题，每小题4分，满分40分） 1．（4分）下列各式中，y 是x 的二次函数的是( ) A ．1y x=B ．21y x =-+C ．22y x =-D ．3y x =2．（4分）已知35(0)x y y =≠，则下列比例式成立的是( ) A ．53x y= B ．53x y = C ．35x y = D ．35x y = 3．（4分）抛物线21y x =+经过平移得到抛物线2(1)y x =+，平移的方法是( )A ．向左平移1个，再向下平移1个单位B ．向右平移1个，再向下平移1个单位C ．向左平移1个，再向上平移1个单位D ．向右平移1个，再向上平移1个单位 4．（4分）如图，在ABC ∆中，//DE BC ，6AD =，3DB =，4AE =，则AC 的长为( )A ．2B ．4C ．6D ．8 5．（4分）点C 是线段AB 的黄金分割点()AC CB <，若2AC =，则(CB = )A ．1B ．3C D 6．（4分）如图所示是二次函数221y ax x a =-+-的图象，则a 的值是( )A ．1a =-B ．12a =C ．1a =D ．1a =或1a =- 7．（4分）二次函数2y ax bx c =++的自变量x 与函数值的对应值如图，下列说法错误的是：( )B ．抛物线与y 轴的交点是(0,4)C ．当2x <-时，y 随x 的增大而减小D ．当2x >-时，y 随x 的增大而增大8．（4分）某企业是一家专门生产季节性产品的企业，当产品无利润时，企业会自动停产，经过调研预测，它一年中每月获得的利润y （万元）和月份n 之间满足函数关系式21424y n n =-+-，则企业停产的月份为( )A ．2月和12月B ．2月至12月C ．1月D ．1月、2月和12月9．（4分）函数2y ax bx c =++的图象如图所示，那么关于x 的方程240ax bx c ++-=的根的情况是( )A ．有两个相等的实数根B ．有两个异号的实数根C ．有两个不相等的实数根D ．没有实数根10．（4分）已知，二次函数2y ax bx c =++满足以下三个条件：①24b c a>，②0a b c -+<，③b c <，则它的图象可能是( )A ．B ．C ．D ． 二、填空题（本大题共4小题，每小题5分，满分20分） 11．（5分）如果线段3a cm =，12b cm =，那么a 和b 的比例中项是 ． 12．（5分）在广安市中考体考前，某初三学生对自己某次实心球训练的录像进行分析，发现实心球飞行高度y （米)与水平距离x （米)之间的关系为21251233y x x =-++，由此可知该生此次实心球训练的成绩为 米． 13．（5分）如图，矩形ABCD 的顶点C ，D 分别在反比例函数8(0)y x x =>．3(0)y x x=>的图象上，顶点A ，B 在x 轴上，连接OC ，交DA 于点E ，则OEEC= ．14．（5分）已知函数221y kx kx =++，当32x -剟时，函数有最大值为4，则k = ． 三、（本大题共2小题，每小题8分，满分16分） 15．（8分）若0234x y z==≠，求代数式x y z x y z +-++的值．16．（8分）已知二次函数2y ax bx c =++的图象经过(0,3)，(1,0)-，(3,0)三点． （1）求二次函数解析式；（2）试说明y 随x 的变化情况．四、（本大题共2小题，每小题8分，满分16分） 17．（8分）已知ABC ∆和DEF ∆中，有23AB BC CA DE EF FD ===，且D E F ∆和ABC ∆的周长之差为15厘米，求ABC ∆和DEF ∆的周长．18．（8分）如图，菱形ABCD 的边长为1，直线l 过点C ，交AB 的延长线于M ，交AD 的延长线于N ，求11AM AN+的值．五、（本大题共2小题，每小题10分，满分20分） 19．（10分）直线(y mx m =为常数）与双曲线(ky k x=为常数）相交于A 、B 两点． （1）若点A 的横坐标为3，点B 的纵坐标为4-．直接写出：k = ，m = ，kmx x>的解集为 ． （2）若双曲线(ky k x=为常数）的图象上有点1(C x ，1)y ，2(D x ，2)y ，当12x x <时，比较1y 与2y 的大小．20．（10分）在平面直角坐标系中，(0,4)A 、(4,4)B 、(4,0)C ，(1,0)D ．（1）若抛物线经过A 、B 、D 三点，求此抛物线的解析式；（2）若（1）中的抛物线的顶点为E ，连接EB ，若P 是EB 上一动点，过P 点作PM AB ⊥，PN 垂直于y 轴，垂足分别是M 、N ．求矩形AMPN 面积的最大值．六、（本题满分38分）21．（12分）如图所示，双曲线(0,0)ky x k x=>>与直线(0y ax b a =+≠，b 为常数）交于(2,4)A ，(,2)B m 两点．（1）求m 的值；（2）若C 点坐标为(,0)n ，当AC BC +的值最小时，求出n 的值； （3）求AOB ∆的面积．22．（12分）某网店经市场调查，发现进价为40元的某新型文具每月的销售量y （件)与售价x （元)的相关信的关系，这个函数可以是 （填“一次函数”函数” )，并求这个函数关系式；（2）当售价为多少元时，当月的销售利润最大，最大利润是多少；（3）若获利不得高于进价的80%，那么售价定为多少元时，月销售利润达到最大，最大利润是多少？ 23．（14分）定义：在平面直角坐标系中，图形G 上点(,)P x y 的纵坐标y 与其横坐标x 的差y x -称为点P 的“坐标差”，而图形G 上所有点的“坐标差”中的最大值称为图形G 的“特征值”． （1）求点(2,1)A 的“坐标差”和抛物线234y x x =-++的“特征值”．（2）某二次函数2(0)x bx c c =-++≠的“特征值”为1-，点B 与点C 分别是此二次函数的图象与x 轴和y 轴的交点，且点B 与点C 的“坐标差”相等，求此二次函数的解析式．（3）如图所示，二次函数2y x px q =-++的图象顶点在“坐标差”为2的一次函数的图象上，四边形DEFO 是矩形，点E 的坐标为(7,3)，点O 为坐标原点，点D 在x 轴上，当二次函数2y x px q =-++的图象与矩形的边有四个交点时，求p 的取值范围．2019-2020学年安徽省合肥市瑶海区九年级（上）期中数学试卷参考答案一、选择题（本大題共10小题，每小题4分，满分40分） 1．（4分）下列各式中，y 是x 的二次函数的是( ) A ．1y x=B ．21y x =-+C ．22y x =-D ．3y x =【解答】解：A 、是反比例函数，错误； B 、是一次函数，错误； C 、是二次函数，正确；D 、是正比例函数，错误．故选C ． 2．（4分）已知35(0)x y y =≠，则下列比例式成立的是( ) A ．53x y= B ．53x y = C ．35x y = D ．35x y = 【解答】解：A 、53x y=，可以化成：15xy =，故此选项错误； B 、53x y=，可以化成：35x y =，故此选项正确； C 、35x y =，可以化成：53x y =，故此选项错误；D 、35x y=，可以化成：53x y =，故此选项错误．故选：B ． 3．（4分）抛物线21y x =+经过平移得到抛物线2(1)y x =+，平移的方法是( )A ．向左平移1个，再向下平移1个单位B ．向右平移1个，再向下平移1个单位C ．向左平移1个，再向上平移1个单位D ．向右平移1个，再向上平移1个单位 【解答】解：21y x =+得到顶点坐标为(0,1)，平移后抛物线2(1)y x =+的顶点坐标为(1,0)-，∴平移方法为：向左平移1个单位，再向下平移1个单位． 故选：A ． 4．（4分）如图，在ABC ∆中，//DE BC ，6AD =，3DB =，4AE =，则AC 的长为( )A ．2B ．4C ．6D ．8【解答】解：//DE BC ，∴AD AE DB EC =，即643EC =， 解得：2EC =，426AC AE EC ∴=+=+=； 故选：C ． 5．（4分）点C 是线段AB 的黄金分割点()AC CB <，若2AC =，则(CB = )A ．1B ．3C D 【解答】解：点C 是线段AB 的黄金分割点，AC CB <，()CB AB AC BC ∴+，(2)CB BC ∴=+，解得，1CB =， 故选：A ． 6．（4分）如图所示是二次函数221y ax x a =-+-的图象，则a 的值是( )A ．1a =-B ．12a =C ．1a =D ．1a =或1a =-【解答】解：由图象得，此二次函数过原点(0,0)， 把点(0,0)代入函数解析式得210a -=，解得1a =±； 又因为此二次函数的开口向上，所以0a >； 所以1a =． 故选：C ．7．（4分）二次函数2x )B ．抛物线与y 轴的交点是(0,4)C ．当2x <-时，y 随x 的增大而减小D ．当2x >-时，y 随x 的增大而增大 【解答】解：由表格可知，该抛物线的对称轴是直线3(2)522x -+-==-，抛物线开口向上，故选项A 正确； 0x =和5x =-对应的函数值相等，故抛物线与y 轴的交点是(0,4)，故选项B 正确；当52x <-时，y 随x 的增大而减小，故选项C 错误；当52x >-时，y 随x 的增大而增大，故选项D 正确；故选：C ．8．（4分）某企业是一家专门生产季节性产品的企业，当产品无利润时，企业会自动停产，经过调研预测，它一年中每月获得的利润y （万元）和月份n 之间满足函数关系式21424y n n =-+-，则企业停产的月份为( )A ．2月和12月B ．2月至12月C ．1月D ．1月、2月和12月【解答】解：由题意知，利润y 和月份n 之间函数关系式为21424y n n =-+-，(2)(12)y n n ∴=---， 当1n =时，0y <， 当2n =时，0y =， 当12n =时，0y =，故停产的月份是1月、2月、12月． 故选：D ．9．（4分）函数2y ax bx c =++的图象如图所示，那么关于x 的方程240ax bx c ++-=的根的情况是( )A ．有两个相等的实数根B ．有两个异号的实数根C ．有两个不相等的实数根D ．没有实数根【解答】解：函数的顶点的纵坐标为4， ∴直线4y =与抛物线只有一个交点，∴方程240ax bx c ++-=有两个相等的实数根． 故选：A ．10．（4分）已知，二次函数2y ax bx c =++满足以下三个条件：①24b c a>，②0a b c -+<，③b c <，则它的图象可能是( )A ．B ．C ．D ．【解答】解：二次函数2y ax bx c =++满足以下三个条件：①24b c a>，②0a b c -+<，③b c <，∴由①可知当0a >时240b ac ->，则抛物线与x 轴有两个交点，当0a <时240b ac -<，则抛物线与x 轴无交点；由②可知：当1x =-时，0y <， 由③可知：0b c -+>，0a b c -+<，∴必须0a <， ∴符合条件的有C 、D ，由C 的图象可知，对称轴直线02bx a =->，0a <，0b ∴>，抛物线交y 的负半轴，0c <，则b c >， 由D 的图象可知，对称轴直线02bx a=-<，0a <，0b ∴<，抛物线交y 的负半轴，0c <，则有可能b c <，故满足条件的图象可能是D ， 故选：D ．二、填空题（本大题共4小题，每小题5分，满分20分） 11．（5分）如果线段3a cm =，12b cm =，那么a 和b 的比例中项是 6 ．【解答】解：根据比例中项的概念结合比例的基本性质，得：比例中项的平方等于两条线段的乘积． 设a 和b 的比例中项是c ，那么2312c =⨯，6c =±，（线段是正数，负值舍去）， 所以6c =， 故答案为6． 12．（5分）在广安市中考体考前，某初三学生对自己某次实心球训练的录像进行分析，发现实心球飞行高度y （米)与水平距离x （米)之间的关系为21251233y x x =-++，由此可知该生此次实心球训练的成绩为 10 米． 【解答】解：当0y =时，212501233y x x =-++=，解得，2x =-（舍去），10x =．故答案为：10．13．（5分）如图，矩形ABCD 的顶点C ，D 分别在反比例函数8(0)y x x =>．3(0)y x x=>的图象上，顶点A ，B 在x 轴上，连接OC ，交DA 于点E ，则OE EC = 35．【解答】解：延长CD 交y 轴于点H ， 点C 在反比例函数8(0)y x x=>的图象上， ∴矩形CBOH 的面积为8， 点D 分别在反比例函数3(0)y x x=>的图象上， ∴矩形ADHO 的面积为3，∴矩形ABCD 的面积为：835-=， :3:5OA CD ∴=， //CD OA ，AOE DCE ∴∆∆∽，∴35OE OA EC CD ==， 故答案为：35．14．（5分）已知函数221y kx kx =++，当32x -剟时，函数有最大值为4，则k = 3-或38．【解答】解：函数2221(1)1y kx kx k x k =++=+-+，当32x -剟时，函数有最大值为4， ∴该函数的对称轴是直线1x =-，当0k <时，1x =-时，函数取得最大值，即14k -+=，得3k =-；当0k >时，2x =时，函数取得最大值，即914k k -+=，解得，38k =， 故答案为：3-或38．三、（本大题共2小题，每小题8分，满分16分）15．（8分）若0234x y z==≠，求代数式x y z x y z +-++的值． 【解答】解：设0234x y zk ===≠，则2x k =，3y k =，4z k =，所以23412349x y z k k k x y z k k k +-+-==++++．16．（8分）已知二次函数2y ax bx c =++的图象经过(0,3)，(1,0)-，(3,0)三点． （1）求二次函数解析式；（2）试说明y 随x 的变化情况．【解答】解：（1）二次函数2y ax bx c =++的图象经过(0,3)，(1,0)-，(3,0)三点，∴93003a b c a b c c ++=⎧⎪-+=⎨⎪=⎩， 解得：123a b c =-⎧⎪=⎨⎪=⎩，∴二次函数解析式的解析式为：223y x x =-++；（2）2223(1)4y x x x =-++=--+，∴当1x <时，y 随x 的增大而增大，当1x >时，y 随x 的增大而减小；当1x =时，y 有最大值为4． 四、（本大题共2小题，每小题8分，满分16分） 17．（8分）已知ABC ∆和DEF ∆中，有23AB BC CA DE EF FD ===，且D E F ∆和ABC ∆的周长之差为15厘米，求ABC ∆和DEF ∆的周长．【解答】解：设ABC ∆和DEF ∆的周长分别是x 厘米和y 厘米．23AB BC CA DE EF FD ===， ∴23AB BC CA x DE EF FD y ++==++① 由题意可得：15y x -=②由①式得23x y =③将③式代入①式得：2153y y -=，45y ∴=，将45y =代入③式得：30x =，答：ABC ∆和DEF ∆的周长分别是30厘米和45厘米．18．（8分）如图，菱形ABCD 的边长为1，直线l 过点C ，交AB 的延长线于M ，交AD 的延长线于N ，求11AM AN+的值．【解答】解：四边形ABCD 是菱形， //BC AD ∴∴AB NCAM NM =//CD AB∴AD CMAN NM=∴1AB AD NC CM AM AN NM NM +=+= 又1AB AD ==，∴111AM AN +=． 答：11AM AN+的值为1． 五、（本大题共2小题，每小题10分，满分20分） 19．（10分）直线(y mx m =为常数）与双曲线(ky k x=为常数）相交于A 、B 两点． （1）若点A 的横坐标为3，点B 的纵坐标为4-．直接写出：k = ，m = ，kmx x>的解集为 ． （2）若双曲线(ky k x=为常数）的图象上有点1(C x ，1)y ，2(D x ，2)y ，当12x x <时，比较1y 与2y 的大小．【解答】解：（1）直线(y mx m =为常数）与双曲线(ky k x=为常数）相交于A 、B 两点，点A 的横坐标为3，点B 的纵坐标为4-， (3,4)A ∴，(3,4)B --，3412k ∴=⨯=，43m =， 由图象可知，kmx x>的解集为30x -<<或3x >， 故答案为12，43，30x -<<或3x >； （2）若点1(C x ，1)y ，2(D x ，2)y 在同一象限，即120x x >，y 随x 的增大而减小， 当12x x <时，则12y y >；若点1(C x ，1)y ，2(D x ，2)y 不在同一象限，即120x x <，当12x x <时，则点1(C x ，1)y 在第三象限，2(D x ，2)y 在第一象限，则12y y <．20．（10分）在平面直角坐标系中，(0,4)A 、(4,4)B 、(4,0)C ，(1,0)D ．（1）若抛物线经过A 、B 、D 三点，求此抛物线的解析式；（2）若（1）中的抛物线的顶点为E ，连接EB ，若P 是EB 上一动点，过P 点作PM AB ⊥，PN 垂直于y 轴，垂足分别是M 、N ．求矩形AMPN 面积的最大值．【解答】解：（1）设抛物线的解析式为：2y ax bx c =++，把(0,4)A 、(4,4)B 、(1,0)D 代入2y ax bx c =++得，164404a b c a b c c ++=⎧⎪++=⎨⎪=⎩， 解得：431634a b c ⎧=⎪⎪⎪=-⎨⎪=⎪⎪⎩， ∴抛物线的解析式为：2416433y x x =+； （2）由（1）可知，抛物线的顶点坐标4(2,)3E -， B 为(4,4)，∴直线BE 的解析式为82033y x =-， ∴设P 点的坐标为820(,)33m m -， 228208328324(2)333333AMPN S m m m m m ⎡⎤⎛⎫∴=--=-+=--+ ⎪⎢⎥⎝⎭⎣⎦矩形， ∴当2m =时，矩形AMPN 面积的最大值为323． 六、（本题满分38分）21．（12分）如图所示，双曲线(0,0)k y x k x=>>与直线(0y ax b a =+≠，b 为常数）交于(2,4)A ，(,2)B m 两点．（1）求m 的值；（2）若C 点坐标为(,0)n ，当AC BC +的值最小时，求出n 的值；（3）求AOB ∆的面积．【解答】解：（1）把(2,4)A 代入(0,0)k y x k x=>>， 248k ∴=⨯=，∴反比例函数的解析式为8y x=，把(,2)B m 代入8y x =得，82m=， 解得4m =；（2）由（1）可知：(2,4)A ，(4,2)B ，B ∴点关于x 轴的对称点(4,2)B '-，连接AB '，交x 轴与C ，此时AC BC AB +='，AC BC +的值最小，设直线AB '的解析式为y ax b =+，把(2,4)A ，(4,2)B '-代入得2442a b a b +=⎧⎨+=-⎩， 解得：310a b =-⎧⎨=⎩， ∴直线AB '的解析式为310y x =-+，把(,0)n 代入得310y n =-+，103n ∴=； （3）设直线AB 的解析式为y mx t =+，∴把(2,4)A ，(4,2)B 代入得2442m t m t +=⎧⎨+=⎩，解得16m t =-⎧⎨=⎩， ∴直线AB 的解析式为6y x =-+，∴直线AB 与x 轴的交点(6,0)C ，116462622AOB AOC BOC S S S ∆∆∆∴=-=⨯⨯-⨯⨯=． 22．（12分）某网店经市场调查，发现进价为40元的某新型文具每月的销售量y （件)与售价x （元)的相关信的关系，这个函数可以是 一次函数 （填“一次函数”或“二次函数” )，并求这个函数关系式；（2）当售价为多少元时，当月的销售利润最大，最大利润是多少；（3）若获利不得高于进价的80%，那么售价定为多少元时，月销售利润达到最大，最大利润是多少？【解答】解：（1）由表格知，售价每增加10元，销售量对应减少20元，所以这个函数是一次函数，设其解析式为y kx b =+，根据题意，得：6028070260k b k b +=⎧⎨+=⎩， 解得：2400k b =-⎧⎨=⎩， 2400y x ∴=-+，故答案为：一次函数；（2）设月销售利润为W ，则(40)(2400)W x x =--+2248016000x x =-+-22(120)12800x =--+，20a =-<，∴当120x =时，W 取得最大值，最大值为12800元，故当售价为120元时，当月的销售利润最大，最大利润是12800元，（3）获利不得高于进价的80%，4080%40x ∴-⨯…，解得：72x …，20a =-<，∴当120x <时，W 随x 的增大而减小，∴当72x =时，W 取得最大值，最大值为8192，答：售价定为72元时，月销售利润达到最大．23．（14分）定义：在平面直角坐标系中，图形G 上点(,)P x y 的纵坐标y 与其横坐标x 的差y x -称为点P 的“坐标差”，而图形G 上所有点的“坐标差”中的最大值称为图形G 的“特征值”．（1）求点(2,1)A 的“坐标差”和抛物线234y x x =-++的“特征值”．（2）某二次函数2(0)x bx c c =-++≠的“特征值”为1-，点B 与点C 分别是此二次函数的图象与x 轴和y 轴的交点，且点B 与点C 的“坐标差”相等，求此二次函数的解析式．（3）如图所示，二次函数2y x px q =-++的图象顶点在“坐标差”为2的一次函数的图象上，四边形DEFO 是矩形，点E 的坐标为(7,3)，点O 为坐标原点，点D 在x 轴上，当二次函数2y x px q =-++的图象与矩形的边有四个交点时，求p 的取值范围．【解答】解：（1）121-=-，故“坐标差”为1-， 2234(1)5y x x x x x -=-++-=--+，故“特征值”为5；（2）由题意得：点(0,)C c ，故点B 、C 的“坐标差”相等，故点(,0)B c -，把点B 的坐标代入2y x bx c =-++得：20()()c b c c =--+-+，解得：1b c =-，故：2(1)y x c x c =-+-+，故抛物线的“特征值”为1-，22(1)y x x c x c x x cx c ∴-=-+-+-=--+， 故24(1)14(1)c c ⨯--=-⨯-． 2c ∴=-，3b =，故抛物线的表达式为：232y x x =-+-；（3）“坐标差”为2的一次函数为：2y x =+，抛物线2y x px q =-++的图象的顶点在2y x =+上，∴设抛物线的表达式为：2()2y x m m =--++，当抛物线与矩形有3个交点时，如图1、2，对于图1，直线与矩形边的交点为：(1,3)， 则对称轴为：12(1)p -=⨯-，解得：2p =， 对于图2，把点(7,3)E 代入2()2y x m m =--++并解得： 5m =或10（舍去10)， 故52(1)p -=⨯-，解得：10p =， 故二次函与矩形的边有四个交点时，求p 的取值范围：210p <<．。
2019-2020学年安徽合肥市第五十五中学高三英语上学期期中考试试题及答案
2019-2020学年安徽合肥市第五十五中学高三英语上学期期中考试试题及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AEast Yorkshire has typical unpredictable British weather. So here are some ideas to keep everybody happy when the weather is not the most ideal.William's Den, North CaveThe outdoor and indoor areas are suitable for children of all ages to have fun.There are nests to explore, rope bridges to cross, a tree-house and a slide. The attached Kitchen provides fresh food made from locally sourced ingredients serving a selection of treats.East Riding Leisure CentresKnown for a fun learner pool alongside an incredible fun zone with two slides as well, it is perfect for kids to find their feet in the water, have fun and explore. Its 6 climbing walls offer a different challenge on each. This place is suitable for anyone over the age of 4 and you can refuel at cafe with fresh food, snacks and cakes.Sewerby Hall and GardensWhen the weather’s not sure, take cover in the Hall and learn how life was in the early 1900’s for the residents and workers of the house. Then explore the zoo and meet the pigs, parrots and penguins! Kids of all ages are welcome.Withernsea LighthouseThere’s no limitation to the age of kids to climb Withernsea Lighthouse, which is 144 steps to the top, with full views of the East Yorkshire Coast at the top of it. Enjoy the museum on the ground floor and learn what life is like working and living in a lighthouse. The souvenir shop provides attractive gifts for visitors at a fair price.1.Which one is unsuitable for kids of all ages?A.William’s Den, North Cave.B.East Riding Leisure Centres.C.Sewerby Hall and Gardens.D.Withernsea Lighthouse.2.Where can kids enjoy food?A.In William’s Den, North Cave and Sewerby Hall and Gardens.B.In East Riding Leisure Centres and Withernsea LighthouseC.In William’s Den, North Cave and East RidingLeisure Centres.D.In Sewerby Hall and Gardens and Withernsea Lighthouse.3.Where does this passage probably come from?A.A geography textbook.B.A science report.C.A finance magazine.D.A travel brochure.BAs summer approaches, many kids and teenagers may find that they have more time in hand. One great way to make use of the extra time is to go on an adventure and travel. Clearly, I am not a naturally adventurous person, but I have found that takingthe risk and challenging myself to explore and travel to unfamiliar places can be a very rewarding experience.Because I am usually quite busy during the school year, most of my travels take place during the summer. Over the past few summers, I have hiked in the Grand Canyon, explored Niagara Falls, and camped out in upstate New York. Although these experiences are varied, they are similar in that they instill (灌输) a sense of appreciation for nature and a more balanced view on life. When I hiked in the Grand Canyon, for example, I was in awe(敬畏) of the geological influences that shaped the canyon.Adventures, of course, are not limited to hiking. There are many other choices, such as camping, volunteering in a foreign environment and travelling to different countries. In my opinion, adventures are more enjoyable with family or a few friends. There is a sense of bonding that one only gets through spending time together in outdoor adventures. For example, when I was in Boy Scouts, I often went on weekend camping trips with my friends. When I came back from a Boy Scouts camping trip, I often was eager to go outside more and explore the parks and nature around me.Next fall, I will attend college. In the meantime though, I hope to make the most of my summer to explore and travel. Now, I am planning on hiking and camping out in Maine.When I visited Maine last fall, I was amazed by how beautiful it was and the tall trees and coasts that exist, and I really hope to enjoy the beauty of nature there this summer.4. We can learn from the first paragraph about the author?A. He is an adventurous person by natureB. He likes challenging himself by travellingC. He enjoys travelling with other adventurersD He needs others’ help when going on an adventure5. Which of the following can make people’s adventure more enjoyable according to the author？A. Going to different countries.B. Going to unfamiliar places.C. Travelling withtheir family or friends.D. Travelling to distant places by themselves.6. What will the author do this summer？A. Explore Niagara Falls.B. Hike in the Grand Canyons.C. Camp out in upstate New York.D. Hike and camp out in Maine.7. Who is probably the author?A. A high school student.B. A college student.C. A friendly guide.D. A warm-hearted teacher.CFlying someone one-way fromLondontoNew Yorkproduces nearly a ton ofcarbon dioxide or CO2. That's alot of this climate-warming greenhouse gas. But there are ways to cut the climate impact of flying, one of which is to ask planes to surf high-altitude winds every chance they get.It's not something they've been allowed to do. But that may change—and soon.Most jets crossing the Atlantic Ocean follow one of several fixed paths that are widely spaced because radar (雷达) had not been able to track aircraft everywhere above the Atlantic. But a new network of satellites could soon change that.Wells was part of a team inEnglandthat calculated the fastest possible routes for passenger planes. According to them , traveltime a plane takes when flying across theAtlanticvaries with the winds that a plane meets. For instance, eastbound (向东的) flights can get a powerful push. Westbound routes miss that benefit. Faster flights burn less fuel. And less burning gives off fewergreenhouse gases.The airline industry knows it has a high " carbon footprint." But it takes decades and many billions of dollars to design, test and fly new planes. Changing a flight path, in contrast, can cut costs and energy right away.The new study doesn't show how well such wind surfing would work for all planes, in all skies and the world over. Bui it does suggest that making flight routes more flexible could cut both fuel use and CO2in some places.However, if flight times vary depending on the wind, scheduling connecting flights and managing runways and gates would become more complicated. The researchers would have to work out the best flight paths that take such scheduling issues into consideration. They may also want to see if flying at different altitudes gives a wider choice of flexible routes at the times most people want to fly.National Air Traffic Services (NATS) which provides air-traffic control for theUnited Kingdomsaid it wouldtemporarily disband its flight-paths system and work to allow airlines to choose flexible routes that would best limit their fuel use.8. What happens to east bound flights when crossing theAtlantic?A. They consume more fuel.B. They use less time and energy.C. They produce more greenhouse gases.D. They are against a stronger wind.9. What should be done to make adopting flexible flight routes possible?A. Calculating the flight time.B. Finding the best flight paths.C. Adjusting the size of jets.D. Adding more runways and gates.10. Which word can best replace the underlined word "disband” in the last paragraph?A. Stop.B. Copy.C. Handle.D. Restore.11. What can we infer from the text?A. Planes are producing the most carbon dioxide.B. New fuel is benefiting airline industries greatly.C. Carbon footprint is a serious problem in theUK.D. Surfing the winds can make air travel greener.DThe outbreak of the novel corona virus pneumonia (NCP) has disrupted the lives and work of nearly every Chinese person. However, a new trend has been on the rise: many have turned themselves into livestreaming users orfollowers.According to Questmobile, a professional big data intelligence services provider in China, the audience for Douyin, Kuaishou and other livestreaming platforms surged to 574 million during the Spring Festival holiday, up 35 percent from 2019.Confined at home, away from their friends and loved ones, people turn to livestreaming to reach out to the world. For them livestreaming can help them share their lives and interest with a global audience, which will give them the sense of being “in the moment”. Even as viewers, they can also engage immediately with livestreamers by commenting and making suggestions.“When I comment on the livestreaming videos, I’m not simply an audience member, but also an active part of the program. That gives me a sense of engagement,” an Internet user named Wang Hao told People’s Daily.Livestreaming is not only for fun, but also a new tool for many businesses. Affected by the pandemic, many businesses had to stop their sales in physical stores. To meet their business goals and survive during these tryingtimes, many chose to livestream to revive their businesses.Joyoung, a leading maker of small kitchen appliances, is a good example. The company not only added a number of broadcasts each day to advertise their products, but also shared the menus that were beneficial to health. “The responses to our livestreaming shows have been well beyond expectations,” Kang Li, who oversees the company’s livestreaming unit, told China daily. “It’s a natural opportunity to truly bond with our followers.”Like it or not, livestreaming is likely to go mainstream in China for both entertainment and business.12. What is the purpose of writing the second paragraph?A. To introduce some popular livestreaming platforms in China.B. To report data on the development of livestreaming in 2019.C. To show that Chinese people spend too much time on livestreaming apps.D. To prove that livestreaming are becoming increasingly popular in China.13. What does Wang Hao think of commenting on livestreaming?A. It is boring to make comments.B. It is the only way to share viewers’ lives.C. It makes people feel involved in the stream.D. It helps livestreamers improve themselves.14. What do paragraphs 5&6 mainly talk about?A. Livestreaming replaced physical stores in many areas.B. Many businesses turned to livestreaming platform for marketing.C. Livestreaming platforms faced challenges during the pandemic.D. Livestreaming platforms made changes to their services.15. How does the author feel about thefuture of livestreaming？A. Positive.B. Uncertain.C. Disappointed.D. Confused.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
2020年安徽合肥市第五十五中学高三生物上学期期中考试试卷及答案解析
2020年安徽合肥市第五十五中学高三生物上学期期中考试试卷及答案解析一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 痩素是由肥胖基因编码的多肽类激素，主要由白色脂肪组织合成并分泌，可作用于下丘脑调节人体的食欲，并参与脂肪及能量代谢的调节，使体重减轻。
有研究发现，多数肥胖者常伴有血清痩素水平升高，提示其体内可能存在“痩素抵抗”现象。
下列有关痩素的推测，错误的是（）A. 痩素可降低食欲，减少进食B. 痩素可抑制脂肪的合成，促进其分解C. 痩素缺乏和痩素抵抗都可能是导致肥胖的重要因素D. 胰岛素与痩素在调节脂肪代谢方面的作用类似2. 植物枝条侧芽的生长受生长素调节。
近期发现植物体内的新型植物激素（SL）也与侧芽生长有关。
研究人员利用野生型和不能合成SL的突变体植株进行不同组合的“Y”型嫁接（将保留有顶芽和等量侧芽的A、B 两个枝条嫁接到同一个根上），一段时间后分别测定A、B两个枝条上侧芽的长度，结果如图所示。
据此可以推测的是A.SL的化学本质也是吲哚乙酸B.SL的合成部位是枝条C.SL通过生长素起作用D.SL抑制侧芽的生长3. 下列是动物减数分裂各期的示意图，正确表示分裂过程顺序的是A. ③③③③③③B. ③③③③③③C. ③③③③③③D. ③③③③③③4. 下列有关实验的叙述正确的是（）A.当渗透装置中长颈漏斗内液面不再升高时,漏斗内溶液浓度等于烧杯内溶液浓度B.观察质壁分离及复原现象实验操作流程:取材→滴加质量分数为0.3g/mL的蔗糖溶液→制片→观察一清水换液→观察C.探究温度对淀粉酶活性的影响,不可用斐林试剂对产物进行检测D.分离叶绿体中色素的实验中,色素带的宽度反映了色素在层析液中溶解度的大小5. 如下图所示，用燕麦胚芽鞘进行实验，一段时间后，胚芽鞘不会弯曲生长的是（）A. ③B. ③C. ③D. ③6. 下列有关植物激素应用的叙述中，不正确的是（）A. 用生长素处理未授粉的番茄花蕾，可得到无子番茄B. 用脱落酸处理水稻种子，可以打破种子休眠促进其萌发C. 用细胞分裂素处理马铃薯块茎，可促进其发芽D. 用乙烯处理未成熟的香蕉，可促进其成熟7. 下列各项应用中，主要利用细胞呼吸原理的是③贮存种子③ 中耕松土③ 水稻的翻晒田③糖渍、盐渍食品③用透气的消毒纱布包扎伤口A. ③③③③B. ③③③③C. ③③③③D. ③③③③③8. 机体维持稳态的主要调节机制是A.神经调节B.神经一体液调节C.体液调节D.神经一体液一免疫调节9. 细胞呼吸能为生命活动提供能量，同时，反应产生的一些中间产物可以成为氨基酸、脂质等合成的原料；非糖物质的代谢产物也能够进入细胞呼吸的不同阶段。
2019-2020学年安徽合肥市第五十五中学高三英语上学期期中试题及参考答案
2019-2020学年安徽合肥市第五十五中学高三英语上学期期中试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AContact CCA's Special Programs to learn more about our wide range of credit and noncredit opportunities for academic and personal development.Summer ProgramAn exceptional 4-week program for students currently completing their study of high school.Earn 3 college credits!Our setting is CCA's Oakland campus, where studio-focused, college-level courses help you push beyond concepts to portfolio(作品集)－ready pieces. On-campus Housing & Scholarships available!Summer CoursesCCA offers about 35 for-creditdegree courses each summer, scheduled on theSan FranciscoandOaklandcampuses.Undergraduate and graduate students can work with a visiting artist, develop skills and stay on track for graduation by earning credits...all while still allowing time to visit family, work, travel, etc.For information about summer housing, please contact the Office of Residential Life at 510594722 or housing@ ca. edu.Summer StartSummer Start is a six-week program designed specifically for international undergraduate and graduate students. This is a for-credit program; students receive six credits towards their degree. During the program, you must live on CCA'sSan Franciscocampus.Tuition includes six units of discounted graduate college credit, which will include books, field trip expenses and one-on-one tutoring. Housing fees include six weeks at CCA's San Francisco Panoramic Residence.Company-Customized ProgramsCCA's Office of Special Programs can design customized workshops to develop and strengthen employee skills within your company. Customized programs have included:An Ideation Sketching class, for the design team of a national clothing retailer, scheduled Friday afternoonsonSan Franciscocampus.Software-specific workshops, for designers from a national paper products and gifts retailer, scheduled in a two-day workshop format during the week on ourOaklandcampus.1.Who would most potentially apply for Summer Program?A.Employees in companies.B.International undergraduate and graduate students.C.High school graduates.D.Undergraduate and graduate students.2.What can students do if they take Summer Courses?A.Go on a field trip.B.Visit famous artists.C.Make some friends.D.Earn some credits.3.What are students required to do if they take Summer Start?A.Live on one of the campuses.B.Pay school fees in advance.C.Read as many books as possible.plete the courses on time.BWhen rescuers were called to rescue a “little owl”, they did not expect to find one that was too fat to fly. A concerned citizen first spotted the poor bird lying helplessly. Even Rufus Samkin, whose team then took the team in on Jan.3, believed the bird to be injured. There were no wounds to be found, however, causing experts to believe the female owl was simply too wet to fly.But it was only after a thorough drying-off and complete checkup that they noted the real issue. The rescuers weighed the owl and concluded that she was “simply extremely obese” and couldn’t take off. This additional weight left her unable to fly, though experts began to wonder how she got so fat in the first place. Because it’s rather unusual for wild birds to reach such a state, they decided to keep her a few weeks and monitor her.In the end, the rescuers assessed that it was simply a case of “natural obesity”. December 2019 was quite warm, which meant that there were many insects for the bird to feast upon. Indeed, the owl was discovered in a field that was “filled with field mice” due to the usual climate. “It’s been very mild here, and the owl is able to findfoods easily,” Samkin explained. With the sudden food, “she ly ate much and got very fat. She had a lovely time, but went too far.”The researchers consequently put the owl on a “strict diet” so she could shrink to a more “natural weight”. She was even put on a bit of exercise and encouraged to fly around. In the end, the bird was sent flying gracefully off into the British countryside at a much healthier and happier weight. Hopefully, this owl won’t come upon another feast of field mice—unless she wants another few weeks at the fat camp.4. What did people think happened to the owl at first?A. She was hurt.B. She was trapped.C. She was hungry.D. She was wet.5. Why was the bird unable to fly?A. She needed a thorough checkup.B. She should be given a drying-off.C. She was completed overweight.D. She was simply extremely strong.6. What made the owl have enough foods?A. The especially warm weather.B. The reducing number of insects.C. The rich fields growing crops.D. The lovely time the bird enjoyed.7. How did the owl loseits weight?A. Going on a diet and exercising.B. Flying in the British countryside.C. Visiting that fat camp again.D. Enjoying her wonderful feast freely.CWhen I was trying to find a place where to spend my December holidays, I met by chance some cheap flights to Iceland. After checking just a few winter pictures of Iceland, I realized that the country, known as the land of fire and ice, during the cold months of the year could offer me experiences I had never had before.For sure you can’t miss the chance to go to Iceland in winter if your traveling wish list includes at least one of the crazy experiences Iceland can offer. Iceland in the North Atlantic Ocean is a paradise (乐园) for all those who want to see the northern lights, experience cold weather conditions and put themselves in geothermal (地热的) baths while the snow is falling on their head.The best way to move around Iceland is with a rental car. Distances are huge and public transport in winter is not really common out of the major towns. As we wanted to be even more convenient we decided to rent a small camper (野营车). Sleeping and cooking in a camper saved us a lot of driving, money and gave us the chance tobe always in the right place at the right time.There were also no locals and in many cases no tourist facilities (设备). For us, as we slept in a camper, it was easier. But for tourists traveling by normal cars it is necessary to check the opening times ofhotels and restaurants as many of them run just from June to September.It is amazing to experience how the weather is changing in Iceland. However, Icelanders prefer to stay inside their houses. They have even no time to complain about the weather in December. All they care about is Christmas. They love to decorate their houses, sing Christmas songs and eat typical Christmas food.8. Why is Iceland famous as the land of fire and ice?A. Because tourists would like to play with fire on the ice.B. Because it is too dry to easily cause fire to happen.C. Because it is hot inside a house and cold outside.D. Because there exist hot springs and freezing ice.9. What did the author think of the rented camper?A. It was not only practical but also economical.B. It was convenient but cost them more money.C. It provided the best chance to see the new country.D. It was much faster than other public transport.10. What does the last paragraph imply?A. The Icelanders prefer to live with their family.B. The joy of Christmas drives the freezing weather away.C. December is the coldest month of the year.D. The Icelanders are always positive and stay outside.11. What does this passage most probably come from?A. A textbookB. A scientific reportC. A travel magazineD. A news reportDElizabeth Bishop is considered one of the best American poets of the 20th century. She was born in Worcester, Massachusetts in 1911. Her dad died when she was just a baby and her mom never recovered from the loss. She went to live with her grandparents in Nova Scotia, Canada when she was five. Eventually Bishop attended Vassar College, where she began to write poetry.At Vassar she discovered Marianne Moore's poetry and met Ms Moore and began their life-long friendship.She later met poet Robert Lowell. She wrote tons and tons of letters to both of them, which is good for us because we would otherwise know very little of her personal life.Bishop published her first book of poetry in 1946 and wrote until her death in 1979. She would spend years working on a single poem. Her poems are not the result of hasty scribbling (匆忙乱写) on paper while eating breakfast. She would look through drafts of poems again and again and improve them until they were as close to perfect as she could get them.Reading Elizabeth Bishop is like being transported to the very place, the very moment she's writing about. She leads us to a microscope so we can see every smallest part of the scene. It seems that she's always asking us to notice more, and more until the poem is so clear in our minds that it's almost painful—like a light that's too bright.12. What do we know about Bishop's early life?A. She was mainly brought up by her grandparents.B. She spent her childhood mainly in Worcester.C. She was always encouraged by her parents.D. She started to write poems at five.13. Why are Bishop's letters to Moore and Lowell important?A. They have a deep influence on other poets.B. They offer much information about her life.C. They help us study Moore and Lowell's poetry.D. They prove she had friendships with famous poets.14. What can we say about Bishop's poetic creation?A. She liked to write in the morning.B. She could write poems at high speed.C. She tried her best to achieve perfection.D. She published hundreds of books of poetry.15. Which word can be used to best describe the style of Bishop’s poems?A. Enthusiastic.B. Romantic.C. Humorous.D. Exact.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
2020年安徽合肥市第五十五中学高三生物上学期期中考试试卷及参考答案
2020年安徽合肥市第五十五中学高三生物上学期期中考试试卷及参考答案一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. ATP(甲)是生命活动的直接能源物质，据图判断下列叙述正确的是（）A. 在主动运输过程中，细胞内乙的含量会明显增加B. 丙中不含磷酸键，是DNA基本组成单位之一C. 丁由腺嘌呤和核糖组成，而戊可用于甲的合成D. 甲→乙和乙→丙过程中，其催化作用的酶空间结构相同2. 如图是一个由153个氨基酸构成的蛋白质分子，下列叙述正确的是（）A.该分子中含有152个肽键B.参与构成该分子的氨基酸中至少有154个氨基和154个羧基C.该蛋白质遇高温变性时，其空间结构被破坏，肽键数减少D.该分子彻底水解将产生153种氨基酸3. 正常人体内的激素、酶和神经递质均有特定的生物活性，这三类物质都是A.在细胞内发挥作用B.与特定分子结合后起作用C.由活细胞产生的蛋白质D.在发挥作用后，要立即被灭活4. 水稻幼根长期淹水会变黑、腐烂，主要是由于（）A.能量不足B.酒精中毒C.乳酸中毒D.CO2中毒5. 两个氨基酸缩合成肽并生成水，这个水分子中的氧原子来自氨基酸的（）A. 氨基B. 羧基C.R基D. 氨基和羧基6. 建设绿色“一路一带”，沙漠防治的先锋树种是沙柳，为提高沙柳成活率，常常需要对沙柳掐尖留芽并摘除一定量成熟叶片。
下列与之相关的叙述中合理的是A.上述过程去除了植物的顶端优势，而顶端优势体现了生长素作用的两重性B.因为叶片无法合成生长素，故而可对沙柳摘除一定量成熟叶片C.沙柳的正常生长在根本上是植物激素调节的结果，同时还受基因组控制和环境影响D.掐尖留芽可使侧芽合成的生长素运输到根尖、促进根生长，从而提高沙柳的成活率7. 下列有关生物学原理在农业生产中应用的叙述，错误的是（）A.合理密植可以保证植物充分利用光能B.稻田定期排水可防止根部因缺氧而变黑腐烂C.松土可以促进植物根系的有氧呼吸，有利于根从土壤中吸收营养物质D.适当增加昼夜温差可以通过降低光合速率，增大呼吸速率来使农作物增产8. 生长素和乙烯都在植物生命活动调节中起重要作用。
2020年安徽合肥市第五十五中学高三生物期中考试试卷及答案解析
2020年安徽合肥市第五十五中学高三生物期中考试试卷及答案解析一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 科研工作者为研究不同生根剂对紫叶紫薇扦插影响研究了2种生根剂在不同浓度下处理不同时间对插枝条生根效果的影响，结果如下图所示。
据图分析，下列说法正确的是（）A.200mg·L-1NAA浸泡3h处理会抑制扦插枝条生根B.2种生根剂对扦插枝条生根率的影响均具有两重性C.NAA组随溶液浓度升高，对插枝条生根率的抑制作用增强D.ABT组随溶液浓度升高，对插枝条生根率的促进作用增强2. 下列关于细胞结构和功能的叙述正确的是（）A.哺乳动物成熟的红细胞不能进行细胞代谢B.洋葱鳞片叶表皮细胞的系统边界是细胞壁C.乳酸菌核糖体的形成与核仁有关D.蓝细菌（蓝藻）遗传物质彻底水解会产生6种物质3. 生物是以实验为基础的自然科学，下列有关实验叙述正确的是（）A.采集土壤小动物的诱虫器设计很好地利用了土壤小动物的趋光性B.若尿液中加入斐林试剂不出现砖红色沉淀，说明尿液中不含葡萄糖C.利用淀粉酶、淀粉、蔗糖探究酶的专一性时，可用碘液检测反应结果D.低温诱导染色体变异的实验观察时，大多数细胞观察不到染色体数目改变4. 某药物H3Z是一种多肽类的激素，能使人对陌生人产生信赖感，有助于治疗孤独症等病症。
下列有关叙述正确的是A.H3Z的基本组成元素是C、H、OB. 合成H3Z时生成的水中的H原子只来自氨基C. 孤独症患者直接口服少量H3Z就可以有效地缓解症状D. 若H3Z被水解成1个二肽，3个四肽，5个六肽，则这些短肽肽键总数是355. 生物大分子是构成生命的基础物质，下列有关生命活动主要承担者——蛋白质的说法错误的是（）A.蛋白质的营养价值主要取决于其含有的非必需氨基酸的种类B.蛋白质与某种RNA结合，可成为“生产蛋白质的机器”C.蛋白质与糖类结合，可成为细胞间互相联络的“语言”D.某些蛋白质具有的螺旋结构，决定了其特定的功能6. 细胞外液渗透压感受器及产生渴觉的神经中枢分别位于A. 大脑皮层、下丘脑B. 下丘脑、下丘脑C. 下丘脑、大脑皮层D. 大脑皮层、大脑皮层7. 如图为某真核细胞内三种具有双层膜的结构(部分)示意图，有关分析错误的是（）A. 图a表示线粒体，其内膜向内腔折叠，增大了膜面积B. 图b表示叶绿体，其内具有少量的DNA和RNAC. 图c表示细胞核，其由核膜、核仁、染色质等组成D. 图a、b、c中内、外膜化学成分无明显差异8. Rubisco是催化C5和CO2反应的酶，O2能和CO2竞争该酶的活性部位，当O2浓度高时，Rubisco和O2结合影响暗反应的进行，导致光合作用速率降低。
2020届安徽合肥市第五十五中学高三生物上学期期中考试试卷及参考答案
2020届安徽合肥市第五十五中学高三生物上学期期中考试试卷及参考答案一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 组成DNA的基本单位是（）A. 氨基酸B. 核糖核苷糖C. 脱氧核糖核苷酸D. 多肽2. 下列有关生物体中化合物的叙述，正确的是（）A.淀粉、糖原和纤维素彻底水解之后，得到的产物是不同的B.性激素在体液调节中发挥作用，其元素组成与磷脂的不同C.DNA和蛋白质分子的多样性都与分子的空间结构密切相关D.多聚体水解的过程，需要水分子参与并消耗一定量的ATP3. 如图为哺乳动物的某组织，据图判断下列说法正确的是（）A.③中含有血红蛋白、二氧化碳和葡萄糖B.③红细胞呼吸作用产生的CO2不会引起③pH发生大幅度变化C.③中的氧气到达③至少需要经过4层膜，③处的氧气浓度高于③处D.肌肉细胞缺氧时会产生乳酸，但由于Na2CO3的调节作用，③的pH会保持恒定4. 幽门螺旋杆菌（简称Hp）是已知能够在人胃中生存的唯一微生物种类，可引起胃炎、消化道溃瘍等。
尿素呼气实验是目前诊断Hp感染准确性最单的方法，受试者口服13C标记的尿素胶囊后，尿素在Hp产生的脲酶作用下水解为NH3和13CO2，通过测定受试者吹出的气体是否含有13CO2作出判断。
下列叙述错误的是（）A.绝大多数微生物不能在人胃内生存是因为不适应强酸环境B.检测Hp用了同位素标记法，所用13C对人体应该是无害的C.脲酶可降低尿素水解反应的活化能D.Hp细胞内，脲酶需要在内质网和高尔基体中进行加工5. 下列哪个不是脂质具有的生物学功能（）A. 构成生物膜B. 作为主要的能源物质C. 缓冲减震D. 调节生理代谢6. 克里克提出的中心法则经过不断发展完善，如图所示，下列相关叙述正确的是（）A. ③③过程都以DNA为模板，碱基配对方式相同B. 人体造血干细胞的细胞核内可以发生③③③过程C. ③③过程中运输同种氨基酸的tRNA可能不同D. 在HIV体内通过③过程可以将遗传信息从RNA流向DNA7. 下列关于细胞中的元素和化合物的叙述，正确的是（）A.无机自然界中的元素在细胞中都能找到，没有一种元素是细胞所特有的B.组成细胞的化合物都含有C元素C.不同生物组织的细胞中各种化合物的含量是有差别的D.组成细胞的各种元素大多以离子形式存在8. 下列有关物质出入细胞的叙述，正确的是A.被动运输需要载体蛋白协助，但不消耗A TPB.在质壁分离的复原过程中，细胞液浓度逐渐降低C.肝细胞通过主动运输吸收葡萄糖和甘油D.胞吐过程体现了细胞膜上载体蛋白的专一性9. 生态学家赫奇森曾说过：共同进化就是“生态的舞台，进化的表演”。
2020年安徽合肥市第五十五中学高三生物上学期期中考试试题及参考答案
2020年安徽合肥市第五十五中学高三生物上学期期中考试试题及参考答案一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 下列有关NAA和GA（赤霉素）的叙述错误的是（）A. 要探究NAA和GA对植物生长的调节作用一般设计3个组别：加NAA组，加GA组，加NAA和GA 组B.NAA和GA均能促进植物伸长生长、促进果实发育C. 在啤酒工业上多用GA促进α－淀粉酶的产生，避免大麦种子由于发芽而造成大量有机物消耗，从而节约成本D. 农业生产实践中不直接使用生长素，而是利用NAA等，原因在于其效果稳定、可大量生产等2. 细胞是生物体结构和功能的基本单位。
在下列关于细胞基本共性的描述中，正确的是（）①均具有脂质与蛋白质构成的膜结构①细胞中含有两种核酸①都具有核糖体作为蛋白质合成的“机器”①遗传信息均储存在脱氧核糖核酸分子中A. ①①B. ①①C. ①①①D. ①①①①3. 如图为神经元结构模式图，电流计A1和A2的两极a、c、d、e分别接在神经纤维外膜上，在b、f两点给予适宜强度的刺激（ab=bc），则电流计的偏转情况为（）A. 在b点与f点刺激时，A1、A2各偏转两次，且方向相反B. 刺激b点时，A1偏转两次，A2偏转一次；刺激f点时，A1不偏转，A2偏转一次C. 刺激b点时，A1不偏转，A2偏转一次；刺激f点时，A1不偏转，A2偏转一次D. 刺激b点时，A1不偏转，A2偏转两次；刺激f点时，A1不偏转，A2偏转一次4. 人们对遗传物质本质的探索经历了一个复杂而漫长的过程。
从最初认为遗传物质是蛋白质到最终认定遗传物质主要是DNA，其中的探索过程非常耐人寻味。
下列有关说法错误的是（）A. 格里菲斯的实验建立在艾弗里实验基础之上，证实了转化因子的存在B. 艾弗里的实验创造性的引入了DNA酶，说明开阔的思路与严谨的思维是成功的必备条件C. 赫尔希和蔡斯根据病毒的组成及独特的增殖方式完成了实验证明，充分体现了实验选材的重要性D. 证明烟草花叶病毒的遗传物质是RNA，是对遗传物质内涵的补充，体现了理论的发展和创新5. 有一种紫腹巨蚊处于幼虫状态时，专以毒蚊幼虫为食，当它发育成成虫后，又以吸食竹类植物的叶汁花浆为生。
2020届安徽合肥市第五十五中学高三英语上学期期中考试试题及答案
2020届安徽合肥市第五十五中学高三英语上学期期中考试试题及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ABrooklyn Children's MuseumFounded in 1899 as the country's first museum specifically made for children, today BCM is comprehensive, with a permanent collection of 30,000 objects, including musical instruments, masks and dolls. Kids love the interactive World Brooklyn, a small cityscape（城市风光）lined by stores where children can pretend to be working grown-ups.Children's Museum of ManhattanLooking for interactive art that welcomes curious minds? Then head to Inside Art, the current show up at CMOM, which lets your little ones climb in and over and all around the exhibits. It's ideas like this that make the 40,000-square-foot so special. Learning about culture, history and science is a pride for kids aged six and under. CMOM also hosts classes—like Gross Biology for kids who are interested in insects-all designed with the latest child-development research in mind.DiMenna Children's History MuseumThe hands-on displays at this kid-focused arm of the New York Historical Society transport children back through 350 years of US history, with a special focus on NYC. Children are encouraged to climb around and interact with exhibits that highlight the lives of kids who grew up to become famous doctors, athletes and political figures! Little New Yorkers can get in on sing-alongs and crafts. Other family programs include cookings classes, games and story hours.Staten Island Children's MuseumStaten Island Children's Museum nurtures（培养）creativity. It offers hands-on experiences like the Block Harbor（plenty of blocks to play with!）, larger-than-life games like Connect Four and Dominoes, and even the opportunity to climb through a human-sized anthill or play firefighter at Ladder 11, so you'll find immersive（沉浸式的）fun around every corner. Don't forget to stop by Green Living Room powered by the wind energy where the kids can learn about ways to reduce our carbon footprint.1. Which museum provides biology classes for kids?A. Brooklyn Children's Museum.B. Staten Island Children's Museum.C. Children's Museum of Manhattan.D. DiMenna Children's History Museum.2. What can kids do in DiMenna Children's History Museum?A. Play interesting games with great firefighters.B. Know about famous people's childhood lives.C. Run stores like adults in different small streets.D. Cook delicious local food with foreign athletes.3. Where can kids learn how to protect the environment?A. At Ladder 11.B. At the Block Harbor.C In Green Living Room. D. On a human-sized anthill.BThe headmaster of a primary school showed on television to support her idea that parents should “dress appropriately in daywear” when they drop off and pick up their kids from school.Kate Chisholm, head teacher atSkerneParkAcademyin Darlington, theU.K., sent a letter home asking parents to set a better example for their children.“I have noticed there has been an increasing tendency for parents to drop off and pick up their kids from school while still wearing their pajamas (睡衣),” Chisholm wrote.“Could I please ask that when you are sending your children, you take the time to dress appropriately in daywear that is suitable for the weather conditions?”Kate Chisholm wants parents at her school to dress nicer. She appeared on British television station ITV to further explain her decision, saying she had started noticing the pajama trend had been picked up by “30 or 40” parents at school.Despite her determination to make school a nicer place to be, Chisholm admits that she can't demand that parents dress up-such as Karen Routh, 49, who wore pajamas to drop off her 8-ycar-old daughter Holly, because she was running late and didn't feel well.“I imagine there might be some people who keep up wearing pajamas for the next six months to prove a point,” Chisholm said. “I can't force people to get dressed but I will keep sending letters home in the hope that they decide to put on a pair of jeans.”Wearing pajamas in public has also become a hot issue for some schools and States in theU.S.In 2015, aFloridaschool board member insisted on a dress rule for parents who showed up in the school in sleepwear.4. The headmaster asks parents to pay attention to ______.A. the way they dressB. the relations with teachersC. the way they treat their kidsD. the clothes they buy for their kids5. How does Chisholm try to change this situation?A. Asking kids to set examples.B. Keeping them out of school.C. Sending letters to persuade them.D. Forcing them to change by laws.6. Why did Kate Chisholm appear on ITV?A. She wanted to force Karen to dress properly.B. Parents spent less time on their clothes.C. She wanted to explain her decision about the parents' dress.D. She wanted to tell us more and more parents wear pajamas to school.7. It can be inferred from the last paragraph that ______.A. strict laws should be passed to stop pajamasB. aFloridaschool will force parents to wear jeansC. people wearing pajamas in public will be punishedD. more and more people are concerned about dressing properly in publicCJapan has announced emergency Covid measures in Tokyo and three other areas in order to control rising infections (传染病), just three months before the country is set to host the Olympics. The government said the state of emergency — set to last for about two weeks— would be “short and powerful”. Under the measures, bars will be required to close and big sporting events will be held without audience. The government has insisted that the Olympics will go ahead in July.Prime minister Yoshihide Suga announced the measures on Friday, saying they would begin on Sunday and remain in place until 11 May. In addition to to Tokyo, Osaka, Kyoto and Hyogo will be affected. It has marked the third state of emergency in japan since the pandemic began. “I sincerely apologize for causing trouble for many people again,” he said. “It is feared that infection in major cities will spread across the whole country if we take no measures.”Under the rules, major facilities like department stores will close, as well as restaurants, bars, and KTV rooms serving alcohol. Restaurants that do not serve alcohol are being told to close early, and companies are being asked to make arrangements for people to work remotely. Schools will remain open. Besides, the emergencymeasurescoincide withthe country’s “Golden Week” holiday, which runs from late April to the first week of May and is the busiest travel period of the year. Tokyo governor Yuriko Koike urged residents to start taking precautions immediately. In an effort to discourage people from going out at night. She said neon signs (霓虹灯) would be turned off.The coronavirus toll in Japan has been much lower than that in many other countries, with about 558,000 cases and fewer than 10,000 deaths, according to figures collected by Johns Hopkins University. But there are concerns over the latest rise in infections, with reports of hospital bed shortages in some areas.Tokyo 2020 president Seiko Hashimoto said at a news conference on Friday that organizers were not considering canceling the event. “I hope the coronavirus situation improves with the prevention measures the government, Tokyo, and other regional governments have put into place,” she said. “We, as Tokyo 2020, continue to wish for the swift return to normal and will continue to work closely to make sure a safe and secure Olympics can happen.”8. According to the passage, what does Japanese government advise people to do?A. To watch a live game.B. To work at home.C. To hang out in the evening.D. To study at home.9. What is the aim of bringing in emergency Covid measures?A. To relieve people's fear of the the pandemic.B. To settle the problem of hospital bed shortages.C. To test government’s management of emergency.D. To ensure the smooth running of the upcoming Olympics.10. Which words can best describe the government’s action?A. generous and brilliant.B. costly but useless.C. positive and considerate.D. accidental but efficient.11. What does the underlined phrase “coincide with” in Paragraph 3 mean?A. meet withB. deal withC. make upD. set upDThe secrets of dreaming are always interesting psychologists. It is generally acknowledged in the field that dreams people have during this time betweenchildhood and full adulthood, that’s around 30, are the strongest and most influential. Yet not enough is known about the repeated patterns of dreaming. Researchers are still trying to answer a basic question: How does dreaming relate to the life experiences and developmentalchallenges?G. William Domhoff and Adam Schneider, at theUniversityofCalifornia, help to answer this question by examining the lengthy dream series of two individuals, “Izzy” and “Jasmine”. Izzy provided a collection of 4, 329 dream reports from between the ages of 12 and 25, while Jasmine provided 664 dreams recorded between the ages of 14 and 25.Large collections of dreams like these pose challenges to researchers. Until recently, the means of studying dream series was to employ a team of recorders who take the time to code each dream for a predetermined(预先确定的)number of content categories, and then compare their results. Nowadays, digital technologies enable the analysis of language usage in dreams with high speed, accuracy, and objectivity. This marks a revolutionary advance in the science of dreaming. However,itcan only lead so far.To gain more specific and detailed insights, Domhoff and Schneider tailored word strings(词串)for each dreamer, mixing elements of traditional research with digital tools for analyzing large data sets. For Izzy these word strings included “family and s”, “celebrities” and “fantasy”, while the word strings they created for Jasmine included “familiar places,” electrical equipment” and “music”. The researchers used these word strings to identify connections between their dreams and real lives. Surprisingly, the results of the analysis revealed a great deal of consistency(一致性)and continuity in both sets of dreams. Izzy pays much attention to pop culture, and has affection for famous actors. Jasmine is an accomplished musician and performer.“The frequencies of dream elements show the intensity(强度)of the dreamer’s personal concern with that element in waking thought,” Domhoff and Schneider conclude. For anyone who still claims dreaming is merely random nonsense from the brain and mental world, these findings are hard to explain away.12. What do psychologists agree with about dreams?A. Dreams are influenced by life experiences.B. Dreaming is never nonsense from the brain.C. Dreams in one’s teens and twenties are strongest.D The patterns of dreaming are usually repeated.13. What does “it” underlined in paragraph 3 refer to?A. The collection of dreams.B. Research into dreaming.C. The digital method.D. The challenge for psychologists.14. How do the researchers conduct their study?A. By analyzing large data sets.B. By developing individualized word strings.C. By identifying the patterns of dreaming.D. By making comparison with traditional research.15. Which can be the best title for the text?A. New tech, new findingB. Dreams: reflections of waking realityC. Lives, languages, dreamsD. Life experiences: elements of mental world第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。