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Alibaba Group Holding Ltd said on Thursday that it will create another online shopping event in ...
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高三下学期英语《》真题及答案
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鲁班锁是中国传统的智力玩具起源于古代汉族建筑中首创的榫卯结构这种三维的拼插器具内部的凹凸部分即榫卯结构啮合十分巧妙外观看是严丝合缝的十字立方体其上下左右前后完全对称．从外表上看六根等长的正四棱柱体分成三组经90°榫卯起来如图若正四棱柱体的高为6底面正方形的边长为1现将该鲁班锁放进一个球形容器内则该球形容器的表面积的最小值为．容器壁的厚度忽略不计
8分AninternationalteamofresearchersfromtheUniversityofOxfordhavefoundthatthewaypeopleusetheInternetiscloselytiedtotheseasonalmovementsinthenaturalworld.Theironlinespeciessearchesfollowthepatternsofseasonalanimalmigrations迁徙. Migratorybirds候鸟floodbacktowheretheyreproduceeveryspring.Thatmigratorybehaviorisaccompaniedbysomehumanbehavior.InEnglish﹣languageWikipedia维基百科theonlinesearchesformigratoryspeciestendtoincreaseinspringwhenthosebirdsarriveintheUnitedStatessaidtheleadauthorJohnMittermeier. Andnotjustbirds.Mittermeierandhisteamsurveyednearly2.5billionWikipediasearchrecordsfor32000speciesacross245languages.Theyalsosawvariablesearchratesforinsectshorsetailsandfloweringplants.SeasonaltrendsseemedtobewidespreadinWikipediabehaviorformanyspeciesofplantsandanimals. Thisfindingsuggestsnewwaystomonitorchangesintheworld'sbiologicaldiversity.Italsoshowsnewwaystoseehowmuchpeoplecareaboutnatureandwhichspeciesandareasmightbethemosteffectivetargetsforconservation. Mittermeierisencouragedbythesearchresults.HecommentedIthinkthere'saconcernamongconservationists生态环境保护者thatpeoplearelosingtouchwiththenaturalworldandthatthey'renotinteractingwithnativespeciesanymore.Andsointhatsenseitwasreallyexcitingandquiteunexpectedformetoseepeople'sWikipediainterestcloselyrelatedtochangesinnature. RichardGrenyerAssociateProfessorfromtheUniversityofOxfordsayssearchdataisusefultoconservationbiologistsByusingthesebigdataapproacheswecandirectourattentiontowardsthedifficultquestionsinmodernconservationwhichspeciesandareasarechangingandwherearethepeoplewhocarethemostandcandothemosttohelp. 1Whathaveresearchersfoundaboutspeciessearches A.Theystrengthentiesamongpeople. B.Theyaffecttheanimalmovements. C.Theydifferinlanguagebackgrounds. D.Theyreflectanimalmigrationseasons. 2WhatisthepurposeofwritingParagraph3 A.Tosummarizetheresearchprocess. B.Tofurthersupporttheresearchfindings. C.Toshowthevarietyofspeciessearches. D.Topresentresearchers'heavyworkload. 3HowdoesMittermeierfeelaboutthesearchresults A.SatisfiedwithWikipedia'sservice. B.WorriedaboutWikipediabehavior. C.Amazedatpeople'scareaboutnature. D.Sadaboutpeople'snotgettingclosetonature. 4WhydoesRichardthinksuchsearchdataisuseful A.Ithelpstoaimatconservationtargets. B.Itincreasesinterestinbigdataapproaches. C.Itkeepstrackoftrendsinbiologists'work. D.Itpushespeopletosolvedifficultproblems.
若函数fx＝sinx+cosx﹣2sinxcosx+1﹣a有零点则实数a的取值范围为
已知函数fx＝若方程3mf2x﹣2m+3fx+2＝0有5个解则m的取值范围是
已知在△ABC中且则x﹣y的值为
已知函数fx＝Asinωx+φA＜0ω＞0的值域为且图象在同一周期内过两点则Aω的值分别为
已知函数． 1求函数y＝fx的值域和值域 2设ABC为△ABC的三个内角若求cosA的值．
已知fx＝若数列{an}满足a1＝an+1＝fan则a20等于
直线ax﹣ay﹣1＝0与圆x﹣22+y2＝1交于AB两点过AB分别作y轴的垂线与y轴交于CD两点若|CD|＝1则整数a＝．
已知样本91011xy的平均数是10方差是2则xy的值为
已知向量x∈[0π]． 1若求x的值 2设若fx﹣m≤0m∈R恒成立求m的取值范围．
计算的结果为
已知圆Mx2+y﹣42＝4点P是直线lx﹣2y＝0上的一动点过点P作圆M的切线PAPB切点为AB． Ⅰ当切线PA的长度为2时求点P的坐标 Ⅱ若△PAM的外接圆为圆N试问当P运动时圆N是否过定点若存在求出所有的定点的坐标若不存在说明理由 Ⅲ求线段AB长度的最小值．
在区间05内任取一个数则使有意义的概率为
复数z＝ii﹣1在复平面内对应的点位于
如图是由正方体与三棱锥组合而成的几何体的三视图则该几何体的表面积为
在△ABC中已知角ABC的对边分别为abc且acosB﹣bcosA＝b+c． 1求角A的大小 2若a＝4求△ABC的面积．
若某程序框图如图所示则该程序运行后输出的值是
8分 TheGreatBookSwap Hisixthgraders!MynameisTonyHill.IampresidentoftheWindsorHighSchoolStudentCouncil.Yourteacherletmecometoyourclasstodaytotellyouaboutareadingprojectthatwewanttodoandweneedyourhelp. Ifyou'relikemeyoulovetoreadbutsometimeshaveahardtimefindingbooksyouwanttoread.Itseemsasifthebestbooksatthelibraryarealwayscheckedout.Tohelpgetmorebooksintopeople'shandswe'replanningtheGreatCommunity社区BookSwap. Tomaketheprojectasuccessweneedeveryone'shelp.Askyourparentsifthereareanyunusedbookstakingupspace.Askyourfriendsandneighbourstodonateunwantedbooks.Maybeyouhavebooksyoulikedwhenyouwereyoungerbutdon'treadanymore.Bringthemtoschoolandmakeayoungreaderhappy.Weneedallkindsofbooksforallkindsofreaders! TherearemanytimesI'dliketogobuynewbooksbutIdon'thavealotofmoneytospendonthem.Wouldn'titbegreattoswapbooksrighthereinourcommunityVolunteerswillorganizethedonatedbooks.Thenthebookswillbedisplayedatthecommunitycenter.Everyonewillbeabletoreadandhopefullyfindtheperfectbook.Studentswillbeallowedtochooseuptotwobooksduringeachdayoftheswap.OurplanistohavethebookswapthefirstSaturdayofeverymonth. Ifyoulikereadingjustcomeandlookthroughthecollectionofbooks.Eachgradewillhaveitsownweektobringinbooks.Rightnoweighthgradeisbringinginbooks.Wheneverygradehasbroughtinbookswewillhavequiteaselection.Youwillprobablyfindatleastonenewbookthatyou'dliketoread.WhoknowsMaybeyou'llfindabooksogoodthatyouwon'tbeabletoputitdown. WhatareyouwaitingforGohomeandcleanoutyourbookshelvesandclosets! 1WhydidTonyHillcometotheclassofsixthgraders A.Toexplainareadingproject. B.Tointroduceanewly﹣builtlibrary. C.Toaskthestudentstohelpdonatebooks. D.Togivethesixthgradersadviceonreading. 2WhatisParagraph4mainlyabout A.Howthebookswapwillwork. B.Whenbookswillbebroughtin. C.Whatkindsofbooksareneeded. D.Whythebookswapisnecessary. 3Whatdoestheunderlinedsentenceinthelastparagraphindicate A.Morebooksareneededinthefuture. B.Volunteersplayanimportantroleintheproject. C.Everyoneissuretobeabletofindthebookshewants. D.Studentshavealreadystartedhelpingwiththebookswap. 4WhichofthefollowingwordsbestdescribesTonyHill A.Realistic. B.Persuasive. C.Independent. D.Ambitious.
30分 DoubleTrouble WhenIwaseightIwantedatoyandneeded﹩10tobuyit.ButasusualIwasbroken.Idecidedtoaskmy11﹣year﹣oldsisterKathleenforaloan.Iwenttoherroom1herforthecash.Laughingsheagreedto2methemoneybutaddedIwillchargeyou10percentcompoundinterestevery3untilyoupaymeback. Compoundinterest﹣﹣﹣what'sthatIasked. Wellinterestiswhatyoucallthe4moneyborrowershavetopaybackonaloansheexplained.Compoundinterestmeansthattheinterestpaymentsgetbiggerandbiggerthe5youtaketopaybacktheloan.Torepaytheloanyouwillneedtogiveme﹩11afteronemonth.Ifyouwaittwomonthstopaymebackyour6willgrowfrom﹩10to﹩11.SoI'llbechargingyouintereston﹩11.ThenIwilladdthatinteresttothe﹩11youalreadyowemefora7of﹩12.10.That'swhatyou'lloweaftertwomonths. Sure.IgetitIsaid.ThoughtruthfullyIwasgetting8. KathleenlentmethemoneyandIboughtthetoy.Mybirthdaycameamonthlaterandmymomgaveme﹩10.9thatwasjusttheamountIneededtobuyanothertoyIwanted10.Iputoffpayingmysisterforamonth.AfteranothermonthI11abouttheloan. SeveralmonthslateronChristmasmorningmysisterandIeachfounda﹩02billinourstockings.Iwasjustputtingitintomypocket12Kathleentappedmeontheshoulder. Sorrykiddo.That'smine.I'm13onyourdebt. HuhThenIrememberedtheloan.Hey!HowcanitbethatmuchI14borrowed﹩10. Trueshesaidbutinteresthasbeencompoundingforeightmonths.Nowyou15me﹩21.43.Shepausedthenadded.Youcanpaymethe﹩1.43. I16tobelievethata﹩10loancouldmorethandoublesoquickly.Muchtomy17mysistergotherpencilandtabletandshowedmeexactlyhowitalladdedup. Myhead18asItriedtokeeptrackofKathleen's19butthistimeIgotthebasicideaofcompoundinterest.I20thehardwaythatborrowingmoneycanbedoubletroubleinnotime. 1A.blaming B.begging C.searching D.preparing 2A.pay B.send C.lend D.hand 3A.month B.year C.week D.day 4A.little B.same C.enough D.extra 5A.shorter B.longer C.more D.less 6A.cash B.saving C.note D.debt 7A.total B.cost C.number D.bill 8A.encouraged B.shocked C.confused D.satisfied 9A.Gradually B.Obviously C.Unfortunately D.Hopefully 10A.seriously B.anxiously C.secretly D.desperately 11A.forgot B.knew C.talked D.cared 12A.after B.until C.while D.when 13A.carrying B.collecting C.relying D.focusing 14A.normally B.nearly C.only D.really 15A.owe B.offer C.take D.give 16A.decided B.refused C.pretended D.managed 17A.relief B.delight C.annoyance D.regret 18A.turned B.nodded C.stuck D.hurt 19A.calculations B.excuses C.directions D.discoveries 20A.explored B.learned C.explained D.questioned
函数的极大值为则实数a＝．
在△ABC中已知A5﹣2B73且AC边的中点M在y轴上BC边的中点N在x轴上求 1顶点C的坐标 2直线MN的方程．
已知函数fx＝2sinωx+φω＞0．|φ|＜的图象如图所示则函数y＝fx+ω的对称中心坐标为
某企业用180万元购买一套新设备该套设备预计平均每年能给企业带来100万元的收入为了维护设备的正常运行第一年需要各种维护费用10万元且从第二年开始每年比上一年所需的维护费用要增加10万元 1求该设备给企业带来的总利润y万元与使用年数xx∈N*的函数关系 2试计算这套设备使用多少年可使年平均利润最大年平均利润最大为多少万元
在等差数列{an}中a2＝﹣1a5＝﹣7则{an}的前10项和为
有五条线段长度分别为23579从这五条线段中任取三条则所取三条线段能构成一个三角形的概率为_．
35分你班英语课上以IHaveADream为题进行说的练习请你写一份讲稿内容包括 1.你的梦想是什么 2.你为何有此梦想 3.你如何实现梦想. 注意 1.词数不少于50 2.开头和结尾已给出不计入总词数. Helloeverybody! Thankyou.
函数是奇函数则flog23＝
已知当x＝θ时函数a∈R且a＞1取得最小值则tanθ＝﹣2时a的值为．
如图是某个人口为90万人的县城人口年龄分布 1分别写出该县城各年龄段人口数 2用分层抽样方法在年龄为20～60岁的人口中随机抽取6人再在这6人中任选2人求这2人年龄都在40～60岁间的概率．
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