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如图,在平面直角坐标系xOy中,点A(3,3),点B(4,0),点C(0,﹣1).(1)以点C为中心,把△ABC逆时针旋转90°,画出旋转后的图形△A′B′C;(2)在(1)中的条件下,①点A经过的...
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在平面直角坐标系xoy中若A.点坐标为﹣33B.点坐标为20则△ABO的面积为A.15B.7.5C.
在平面直角坐标系中把点P-53向右平移8个单位得到点P1再将点P1绕原点旋转90°得到点P2则点P2
(3,-3)
(-3,3)
(3,3)或(-3,-3)
(3,-3)或(-3,3)
平面直角坐标系中点A.0-1与点B.33之间的距离是.
在平面直角坐标系xoy中⊙O.的半径为4点P.的坐标为34则点P.的位置为
在⊙A.外
在⊙A. 上
在⊙A. 内
不确定
有下列叙述①在空间直角坐标系中在x轴上的点的坐标一定可记为0bc②在空间直角坐标系中在y轴上的点的坐
如图6419在平面直角坐标系xOy中点A.B.的坐标分别为302-3△AB′O.′是△ABO关于
在平面直角坐标系xOy中点P.-23关于y轴的对称点的坐标是.
如图平面直角坐标系xOy中点A.B.的坐标分别为302-3则△AB'O'是△ABO关于点A.的位似图
在平面直角坐标系xOy中若点P.m1到直线4x-3y-1=0的距离为4且点P.在不等式2x+y≥3表
在平面直角坐标系中把点P-53向右平移8个单位得到点P1再将点P1绕原点旋转90得到点P2则点P2的
(3,-3)
(-3,3)
(3,3)或(-3,-3)
(3,-3)或(-3,3)
在平面直角坐标系xOy中已知点P在x轴下方在y轴右侧且点P到x轴的距离为3到y轴的距离为4则点P的坐
(﹣3,4)
(﹣4,3)
(3,﹣4)
(4,﹣3)
如图在平面直角坐标系xOy中已知点A.34将OA绕坐标原点O.逆时针旋转90°至OA′则点A.′的坐
在空间直角坐标系中点P.13-5关于平面xOy对称的点的坐标是
(-1,3,-5)
(1,3,5)
(1,-3,5)
(-1,-3,5)
如图在平面直角坐标系xOy中已知点A.34将OA绕坐标原点O.逆时针旋转90°至OA′则点A.′的坐
在平面直角坐标系xOy内曲线y=x3-3x2+1在点1-1处的切线方程为____
如图在平面直角坐标系xOy中已知点A.34将OA绕坐标原点O.逆时针旋转90°至OA′则点A.′的坐
如图在平面直角坐标系xOy中△AOB三个顶点的坐标分别为O.00A.-23B.-42将△AOB绕点O
在平面直角坐标系xOy若点A的坐标为﹣33点B的坐标为20则△ABO的面积为
15
7.5
6
3
在平面直角坐标系xOy中已知点P.-33点Q.在x轴上△PQO是等腰三角形则满足条件的点Q.共有
5个
4个
3个
2个
如图在平面直角坐标系xOy中A.44B.12C.32.与△ABC与△DBC全等则点D.坐标为
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根据短文内容及首字母提示填写所缺单词并将答案填写在答题卡标号为66﹣75的相应位置上. Haveyouheardofsumo相扑?It'sasport66stowrestling摔跤.Infactrobotsdosumotoo. ThreestudentsfromJinanExperimentalMiddleSchoolwonthesumocompetition67dthe16thRobofestWorldChampionshipin2016.Robofestisaninternationalcompetitionthatchallengesstudentstodesignbuildandprogrammerobots.In2016itwas68hatLawrenceTechnologicalUniversityintheUSA. Tworobotsfighteachotheronatableforthematch.Abottleisinthe69cofthetable.Ifarobotpushestheotherrobotorthebottleoffthetableand70ronthetableforthreesecondsitwillwin. TheChineseteamwontworounds.Whatwerethesecretsthathelpedthemwin?Firsttheymadetheirrobot71p.Theirrobotlookedlikealargeforklift铲车.Alsotheyusedahigh﹣poweredmotor.Themotormadetheirrobotstrongerwhenit72fwitheachother.Atthesametimetheirrobotwasvery73c.Theteamdesignedsomeprogrammestohelptheirrobotdealwithdifferentproblems. Inoneroundtheirrobotwaspushedtotheendofthetableand74afelloff.Butsuddenlyitstoppedandmovedtheotherway75i.Theirrobothadaspecialprogramme.Assoonasitdiscoveredthetable'senditwouldmovebackandpresentitselffromfallingoff.Reallyamazingright? 66. 67. 68. 69. 70. 71. 72. 73. 74. 75.
OnchildDayourclassmatesusuallysendlotsofbookstotheschoolsinpoorareas.
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Doyoufindithardtolearnmathandhistory?ArecentstudycarriedoutbyscientistsfromUniversityofLondonmaybeofhelptoyou.Theyfoundthatteenagerscouldgethighermarksinmathiftheystudiedinthemorningandbettergradesinhistoryiftheyweretaughtintheafternoon. TheresearchersdidastudyatasecondaryschoolinBulgariaovernineyears.Theresultsshowedthatwhenteenagershadmathclassesearlierinthedaytheyscoredonaverage平均7percenthigherinteststhanwhentaughtintheafternoon.Lower﹣abilitystudentsdidworstwhentheywerestudyingmathintheafternoon. Inhistorystudentstaughtintheafternoonscoredonaverage6percenthigherthanwhentheyweretaughtinthemorning.Howeveritdoesn'tworkforothersubjectssuchaslanguagesorgeography. VelichkaDimitrovaleaderofthestudysaidthefindingsshowthatwedobetteratdifferenttimesoftheday. InthemorningourbrainsarebetterandfreshersowearebetteratdoingsomethingthatrepeatsalotlikeproblemsolvingwherewerequiremorespeedandattentionDimitrovatoldTheTelegraph. Intheafternoonitseemsthatthisprocess过程slowsdown.Ontheotherhandhistoryisbettersuitablefortheafternoonwhenwearemorecreativeandopentodiscussionshesaid. Subjectssuchasforeignlanguagesrequirebothmemoryandrepetition重复andtheyalsoneedpeopletobecreative.Thisisperhapswhythetimeofdayhasnoinfluenceonlearning. Time﹣of﹣dayeffectssuchasthosearebelievedtobeconnectedtothebodyclock.Thisisthesysteminourbodiesthatcontrolswhenweneedtosleep.SomeschoolsintheUSandUKhavetriedoutlaterschoolstartingtimesforteenagerswhosebodyclockschangeastheygrowintoadults. Dimitrovabelievesschoolsshouldtakethischancetoimprovestudents'performancejustbychangingtheirtimetables. 31.Accordingtothestudystudentstaughtinthemorningdobetterin. A.history B.English C.geography D.math 32.Itisbelievedthatthetime﹣of﹣dayeffectshavesomethingtodowithastudent's. A.age B.hobby C.bodyclock D.learninghabit 33.Historyisbettersuitablefortheafternoonbecause. A.itisaneasysubjectforstudentstolearn B.wearemorecreativeandopentodiscussion C.ourbrainsarebetterandfresherintheafternoon D.it'seasiertopaymoreattentiontotheworkwearedoing 34.Dimitrovaissurethat. A.itisbettertolearnhistoryandmathinthemorning B.changingtimetablesproperlycanimprovestudents'performance C.differenttimesofadayhavesomeinfluenceonlearninglanguages D.itmakesnodifferenceforlower﹣abilitystudentstolearnmathintheafternoon 35.Whatisthemainideaofthepassage? A.Thegoodadviceonmanagingaschool. B.Theimportanceoflearninghistoryandmath. C.Thegoodwaystogethigherscoresinhistoryandmath. D.Theinfluenceoftimetablesonhistoryandmathlearning.
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Weusuallyseeancientplantsorinsectsinamber琥珀.Butrecentlyagroupofresearchersfoundsomethingunusualinamber﹣afeatheredtail! Thetailincludesbonessofttissueandevenfeathers.Itis37mmlongwhichisaboutthelengthofamatchstick.Itlookslikeaplantatfirstsight.Butresearcherslateridentified确定itaspartofthetailofadinosaurthatcouldn'tflyalmost100millionyearsago. XingLidaofBeijing'sChinaUniversityofGeosciencesdiscoveredtheamberinamarketinMyanmarin2015.Itisanamazingfossil化石andthefinestdetailsoffeatherscanbeseenin3﹣D.hesaid. Theresearchersnoteintheirpaperthatthisfindingisparticularlyspecialbecausealthoughdinosaurfeathershavebeenfoundinamberbeforewedon'tknowwhichdinosaurstheycamefrom.Butthistimeresearchersknowmore. Thetailislikelytobelongtoatinydinosaurcalledcoelurosaur.FamouscoelurosaursincludetheT﹣rex霸王龙andVelociraptor迅猛龙﹣thelatterofwhichwouldfinallyevolveintobirds. SowiththeonceinalifetimefindingcanwehopeforthepossibilityofarealJurassicPark侏罗纪公园?InthemovieseriesscientistsbringdinosaursbacktolifebygettingtheirDNAfrombloodfoundinamber. ButCanadianscientistRyanMckellarsaidthatalthoughsofttissueandbloodofthetailwerefoundintheambernogeneticmaterialwaskept.TheJurassicParkanswerisstilla‘no'﹣thisisinthesciencefiction.hesaid. 31.Whatdidagroupofresearchersfindinamberrecently? A.Ancientplants. B.Atailofsomeancientbirdsthatcouldn'tfly. C.Ancientinsects. D.Atailwithfeathersthatbelongstoadinosaur. 32.Whatdoyouknowabouttheamber? a.Itisabout100millionyearsold.b.ItwasdiscoveredinMyanmar. c.Itwasdiscoveredthisyear.d.Itisavaluablefossil. A.ab B.bc C.ac D.bd 33.WhatdoestheunderlinedphraseevolveintoinParagraph5mean? A.comeinto B.breakinto C.growinto D.getinto 34.Whyisthefindingparticularlyspecial? A.Becauseitisthefirsttimethatdinosaurfeathershavebeenfoundinamber. B.Becauseresearchersknowwhichdinosaurthetailmightbelongto. C.BecauseresearcherslearnedthatVelociraotporsevolvedintobirds. D.Becauseresearcherslearnedthatthereweretwotypesofcoelurosaurs. 35.ThemovieJurassicParkismentionedto. A.talkabouttheuseofDNAinthisarea B.callonpeopletowatchit C.comparedifferentdinosaurs D.talkaboutsciencefiction
Medicinewilldoharmto健康ifitisnottakenproperly.
根据短文内容从下面方框中选择适当的单词或短语填空使短文内容完整正确并将答案填写在答题卡标号为51﹣55的相应位置上. Inancienttimestherewerenoclocks.Itwastheroosterthattoldpeopleitwastimeto51andstartwork.Thereforehard﹣workingancientChinesepeoplewerebigfansoftherooster. Traditionallytheroosterwasseen52thatcouldgetridofevilspirits.Folktalessayalltheevilthingsatnightleaveonceroosters53.Theroosteralsoenjoysagoodreputation名声forits54.ThepronunciationofroosterinPutonghuais55thatofchance.Haveyounoticedthis? 51. 52. 53. 54. 55.
Withanannouncementmadeon1April2017Xionganhasbecomeawell﹣knownnameinChinaovernight.XionganNewAreaabout100kilometerssouth﹣westofBeijingcoversthreecounties:XiongxianRongchengandAnxin. 26.XionganNewAreais. A.inTianjin B.inBeijing C.inHebeiProvince D.inBaoding 27.WhichofthefollowingisTRUE? A.XionganNewAreacoversfourcounties. B.XionganNewAreawillbecomelargerandlarger. C.XionganNewAreais100kilometresnorth﹣westofBeijing. D.XionganNewAreawillcoverabout200squarekminthelongterm.
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