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铜及其化合物在科研和生产中具有广泛用途．回答下列问题： （l）基态Cu原子的价电子排布图是 ． （2）从核外电子排布角度解释高温下Cu2O比CuO更稳定的原因是 ． （3）铜晶体中Cu...
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高三下学期化学《》真题及答案
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背景材料阅读下列三段高中化学中有关硫及其化合物的材料材料一普通高中化学课程标准实验的内容标准通过实验
碱金属及其化合物在生活和化工生产中具有广泛的用途下列说法正确的是
钠钾合金能用作原子反应堆的导热剂是由于二者是活泼金属易失电子
用饱和碳酸氢钠制造灭火剂比用饱和碳酸钠制造灭火剂的效果好
碳酸钠可用于制造洗涤剂，因为碳酸钠是碱
五彩缤纷的焰火是K.单质燃烧所致
下图是部分短周期元素的单质及其化合物的转化关系图有关反应的条件及生成的H2O已略去已知A.AB.C.
新药是指
具有新的临床用途的药品
未曾在我国国内生产的药品
未曾在中国境内上市销售的药品
新合成的化合物
从中药中提取的新化合物
航天科学家正在考虑用塑料飞船代替铝质飞船进行太空探索其依据是
塑料是一种高分子化合物，可以通过取代反应大量生产
塑料生产中加入添加剂可得到性能比铝更优良的新型材料
塑料用途广泛，可从自然界中直接得到
塑料是有机物，不会和强酸或强碱作用
下列选项中的接触非常广泛在其生产运输保存使用中均有大量的职业接触者
高分子化合物
农药
苯的氨基和硝基化合物
刺激性气体
已知某元素A能与ⅦA族某一元素B生成A本身的最高价化合物在此化合物中B的含量为92.2%而在与此相应
我国科研人员以传统中药为原料先制得化合物Ⅰ再转化为具有抗癌抑菌活动的化合物Ⅱ有关转化如图所示下列有关
化合物Ⅰ的分子式为C
19
H
24
O
5
化合物Ⅰ和Ⅱ均能与酸性KMnO
4
溶液和NaOH溶液反应
化合物Ⅱ一定条件下能发生取代、消去及加成反应
检验化合物Ⅱ中是否含化合物Ⅰ可用Br
2
的CCl
4
溶液
如图是部分短周期元素的单质及其化合物或其溶液的转化关系已知在常温常压下A.是固体B.C.D.E.是非
铜是重要金属Cu的化合物在科学研究和工业生产中具有许多用途如CuSO4溶液常用作电解液电镀液等请回答
镁化合物具有广泛用途请回答有关镁的下列问题1单质镁在空气中燃烧的主要产物是白色的__________
碘及其化合物在合成杀菌剂药物等方面具有广泛用途回答下列问题3已知反应2HIg===H2g+I2g的Δ
对于下列金属及其化合物在固体废物的监测中优先考虑的重金属及其化合物是
铜
铅
锌
铁
汞及其化合物砷及其无机化合物黄磷碘甲烷甲基丙烯酸甲酯氰化物等具有剧毒性
铁铝和铜等金属及其化合物在日常生活中应用广泛请根据下列实验回答问题1生产中含有一种铁碳化合物XFe3
铜及其化合物在科学研究和工业生产中具有许多用途请回答下列问题1写出基态Cu+离子的价电子排布式___
碘及其化合物在合成杀菌剂药物等方面具有广泛用途回答下列问题3已知反应2HIg===H2g+I2g的Δ
铁及其化合物均具有低毒性和微毒性
橡胶是一种有机化合物是工业上用途广泛的工程材料
化工生产中采用的喷镀层较为普遍的是在碳钢上喷镀铝和锌铝镀层可用于的腐蚀环境
雨水
大气
含硫化合物
含氯化合物
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1已知ab都是正数且a≠b求证a3+b3＞a2b+ab2 2已知abc都是正数求证≥abc．
ThebookingnotesoftheplayTheAgeofInnocence: Price:﹩10 BOOKING Therearefoureasywaystobookseatsforperformance: ﹣﹣inperson TheBoxOfficeisopenfromMondaytoSaturday10a.m.﹣8p.m. ﹣﹣bytelephone Ring01324976toreserveyourticketsortopaybycreditcardVisaMasterCardandAmexaccepted ﹣﹣bypost SimplycompletethebookingformandreturnittoGlobalTheatreBoxOffice. ﹣﹣online Completetheon﹣linebookingformatwww.Satan﹣fiedtheatre.com DISCOUNTS: Saver:﹩2offanyseatbookedanytimeinadvanceforperformancesfromMondayto Thursday.Saversareavailableforchildrenupto16yearsoldover60sandfull﹣timestudents. Supersaver:half﹣priceseatsareavailableforpeoplewithdisabilitiesandonecompanion.Itisadvisabletobookinadvance.Thereisamaximumofeightwheelchairspacesavailableandonewheelchairspacewillbehelduntilanhourbeforetheshow. Standby:bestavailableseatsareonsalefor﹩6fromonehourbeforetheperformanceforpeopleeligiblesuitableforSaverandSupersaverdiscountsandthirtyminutesbeforeforallothercustomers. GroupBookings:thereisatenpercentdiscountforpartiesoftwelveormore. School:schoolpartiesoftenormorecanbook﹩6standbyticketsinadvanceandwillgeteverytenthticketfree. Pleasenote:weareunabletoexchangeticketsorrefundmoneyunlessaperformanceiscanceledduetounforeseencircumstances. 1IfyouwanttobookaticketyouCANNOT. A.usetheInternet B.completeabookingformandpostittotheBoxOffice C.ringthebookingnumberandpayfortheticketsbycreditcard D.gototheBoxOfficeonSundays 2Accordingtothenoteswhocanget﹩2off? A.An18﹣year﹣oldteenager. B.A55﹣year﹣oldwoman. C.A20﹣year﹣oldfull﹣timecollegestudent D.ThepeoplewhobooktheticketsonFridays. 3Fromthepassagewecanknowallthefollowinginformationexceptthat. A.itisadvisabletobookticketsinadvance B.aschoolpartyof15studentsshouldpay﹩90forthestandbytickets C.theaudiencecan'trefundmoneyiftheperformanceisonshow D.agroupof13personscangeta10percentdiscount
不等式＜4的解集是．
观察下列一组数据 a1＝1 a2＝3+5 a3＝7+9+11 a4＝13+15+17+19 … 则a10从左到右第一个数是
假定英语课上老师要求同桌之河交换修改作文.请你修改你同桌写的以下作文.文中共有10处语亩错误毎句中杲多看两处毎处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号Λ并住其下面写岀该加的词 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线.并在该词下面写出修改后的词. 注意:1毎处错误及其修改均仅限一词; 2.只允许修改10处.多者从11处起不计分. OnedayIaskedJennyoneofmyfriendwhethershewouldliketostudyEnglishwithme.YourideasoundedverygoodbecausewecanallimproveourEnglishJennysaid.''ThereforeIwon'tdothatbeforeyoumakeprogressinthecomeexaminationnextweek.'ThensheaskedifIwaswillingtomeetchallenge.HearingherwordsansweredwhatIwould.IusedtheInternetfilmsbooksoreverythingelsetoimprovemyEnglishskills.MuchtomyhappinessmadeitaweeklateandJennyagreedwithtostudytogetherwithme.
假定你是学生会__李华你校将举办主题为祖国颂的庆祝建国70周年文艺演出你将邀请你的英国朋友Joe观看这场演出.请你写封邮件向他介绍有关情况内容包括: 1.举办的时间和地点; 2.活动的目的; 3.活动的内容. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.参考词汇:祖国颂OdetoOurMotherland;周年纪念日anniversary. DearJoe Yours LiHua
RogerFedererolderthanthepreviouslyoldestmanreturnedtoNo.1rankinginmen'stennisattheage36willbringa12﹣matchwinningstreak连胜totheBNPParibasOpenwhichstartsthisweekattheIndianWellsTennisGarden. Federerafive﹣timewinnerofthehard﹣courteventanda20﹣timeGrandSlamsingleschampiononTuesdaywasseededNo.1inafieldthathasbeengivenupbyinjuriestoseveralexcellentplayers.AmongthosemissingareworldNo.2RataclNadalhipinjuryStanWawrinkakneewholosttoFedererinthe2017finalDavidGoffineyeandAndyMurrayhipsurgery. Federerwhohasspent305weeksofhiscareeratthetoptheAssnofTennisProfessionalworldrankingsmustreachthesemifinalsatIndianWellstokeephisNo.Istatus.IfheexitssoonerthanthatNadalwouldregainthetopspot.Federerhasafirst﹣roundbye轮空andaseeminglyeasyprojectedroutetothequarterfinalswherehelikelywouldfaceNo.5seedDominicThiemofAustria. HewasaskedbyTheAssociatedPresswhatonefactorwasmostessentialtothiscareerrenaissance. MaybemypositivityyouknowFedererreplied.'Andmybeliefthat1couldgetbacktoNo.1and1couldgetbacktowinningways.Eveninthedifficultmoments1wasupbeatImustsay Hedidn'tdoitaloneofcourseIdidneedthefinalpushbymyteam.That'swhyIalwaystalkabouthowimportanttheyarebecausewithoutthemhonestlythere'snochanceIcouldhavedonethis.Andifthemajorityoronepersonwouldhavetoldme'LookIthinkyourdaysaredone'thenIthinkalsoitwouldbeadifferentsituationtodayhesaid.Buteverybodykindofbelievedinme. 1Whatcanweinferfromparagraph2? A.FederergaveupthematchonTuesdayduetotheinjury. B.ManyexcellentplayerstookpartinthematchincludingRafaelNadal. C.FedererwasluckyenoughseededNo.1onTuesday. D.StanWawrinkabeatFedererinthe2017final. 2WhydoesFedererhaveaseeminglyeasyprojectedroutetothequarterfinals? A.BecauseheisseededNo.l B.Becausehehasafirst﹣roundbye. C.Becausemanyexcellentplayersaremissing. D.Becauseheiswellenoughtobeatanyplayer. 3WhoismostlikelytobetheseednexttoFedereramongtheplayerswhocanplayintheBNPParibasOpen? A.RafaelNadal. B.MariaSharapova. C.NovakDjokovic. DDominicThiem. 4Whatisthebesttittleofthetext? A.RogerFedererseededNo.L B.RogerFederertobringa12﹣matchwinningstreak. C.RogerFedererbeateveryoneinthetournament. D.RogerFederertheoldestNo.1
Whilethousandsofcollegestudentsheadedforwarmclimatetoenjoysunandfunduringtheirweekofffromclassessevenlocalstudentshadotherplans TheNorthernEssexCommunityCollegeNECCstudentsandoneoftheirteachersspentpartoftheirspringbreakinNewYorkCity1helprepairanareadestroyedbythehurricane. IwantedtoseeformyselfwhathappenedsaidTerry.Icouldn'timagine2totalwhatitisliketoloseyourhomeandeverythingthatyouhadandthe3powereffectthehurricanehadonthosepeopleIwantedtodosomethingtounderstandtheirfeelingofhelplessness. ThegroupheadedintoBrooklyn'sRedHookdistrictwhich4strikehardbythehurricane.Theretheymetpeoplefromotherpartsofthecountrywhohadalsovolunteered5offerhelp. TogetherthosevolunteersandtheNECCstudentsworkedtoclearrubbishoutofathree﹣storybuilding.Theyputonprotectivesuitsandgloves6theyenteredthebuilding. Insidethebuildingthestudentssawnothingbutbrokenwallsanddoorsandpiecesofthebuildinglyingallover7place. Thestudentsreturnedtoschoolwithasenseof8achieveandtheyfelthappybecause9helpedpeopleinneed.Itwasremarkablehowacommunitylostsomuchandwasstillabletorecoverandthisleftthedeepestimpression10thestudents.
Ifyouwanttosavemoneyongroceriesfollowingwayswillhelpyoucut﹩100outofyourmonthlygrocerybillwithouttoomucheffort. 1Convenienceletsyousavetimeforotherthingsyouneedtogetdone.Pre﹣madeitemsmaysaveyourtimebuttheycostaprettypenny.Theseitemscomeintheformofpackageddinnersorpre﹣cutproduce.Insteadofthatplateofcutpineapplebuythewholefruitorvegetableforapartofthecost. Knowwhattobuyinbulk大批.Shoppingatwarehousestorescanbeagreatwaytosavemoneybutnoteveryitemisworthbuyinginbulk.2 SkipthemeatTheBureauofLaborStatisticsreportsthattheaveragecostofbeefis﹩4.13perpoundthisMarch.3Ifyouskipthebeeftwiceaweekyoucaninstantlycut﹩30to﹩40ifnotmoreoffyourgrocerybilleachmonth. Knowwhattobuyinseason.Fruitsandvegetablesareagreatadditiontoyourdailydietbuttheycanaddasignificantamounttoyourgrocerybillespeciallywhenyoubuyitemsoutofseason.4Ifyourfavoriteitemsaregettingreadytogooutofseasonconsiderbuyingalittleextraandfreezingthem. 5Howevertherearewaystostretchyourdollarfurtherwithouthurtingyourhabits. A.Storepre﹣madeitems. B.Skiptheprepareditems. C.Shoppingforgroceriescanbeanexpensiveattempt. D.Beefhasseenasignificantincreaseinpriceoverthepastfewyears. E.Thecostcanaddupquicklyifyou'reeatingbeefthreeorfourtimesperweek. F.Asproduceitemsgooutofseasonthebecomemoreexpensiveasthesupplydecreases. G.Certainitemsmakesensetobuyinlargequantitiesastheytypicallyhavealongershelflife.
Pleasemotherdositdownandletmetrymyhand.saidFredabrightactiveboytwelveyearsold.Alookofreliefcameoverhismother'sfaceassheseatedherselfwholookedpaleandwom.Fredwashedthedishessweptthekitchenandthensetoutforschool.Afterschoolhehurriedhomesetthetableandagainwashedthedishes. Hekeptoninthiswayforseveraldaystillhismotherwasabletoresumeherusualworkandhefeltfullyrewardedwhenthedoctorwhohappenedinonedaysaidwellmadamit'smyopinionthatyouwouldbeverysickifyouhadnotkeptquiet TheboysmissedFredbecausehehadbeeninthehabitofgoingearlytoschoolandstayingtoplayafteritwasdismissed.Theircuriositywasexcitedwhenhewouldgivenootherreasonthanthathewaswantedathome.OneboysecretlydetectedFredwashingdishesfromhiskitchenwindowandreportedthisatschoolandvariouswerethegreetingspoorFredreceivedduringbreak.Wellyouareabraveonetostayathomewashingdishes.Girlboy!PrettyBessie!Lostyourapronhaven'tyouPolly! Fredwasnotwantingeitherinspiritorcourageandhewasstronglytemptedtoresent对…气愤theseinsultsandtofightsomeboys.Buthisconsciousnessofrightandhisloveforhismotherhelpedhim. Whilehewasstrugglingforselfmasteryhisteacherappearedatthedooroftheschoolhouse.Fredcaughthiseyeanditseemedtolookifitdidn'tsayDon'tgiveup!Bereallybrave!Heknewhisteacherhadheardtheinsultingremarksofhisthoughtlessschoolmates. TheboysreceivednoticeduringthedaythatFredmustnotbeteasedinanymanner.Theyknewthattheteachermeantwhathesaid. 1Howdoweunderstandthedoctor'swords? A.Themotherwassickbecauseshedidn'tkeepquiet. B.EncouragemorechildrentolearnfromFred. C.Themotherrecoveredduetoherremainingquiet D.Hopethemotherwouldexercisemorethankeepquiet. 2WhatdoesthewordgreetinginParagraph3referto? A.Teases. B.Admiringremarks. C.Criticisms. D.Sympatheticremarks. 3WhatdoweknowaboutFredinParagraph4? A.Fred'scourageenabledhimtotight. B.Fred'sloveformotherhelpedhimfight. C.Fredhadneitherspiritnorcouragetofight. D.Fred'saflectionformotherstoppedhimfighting. 4Whatisthetextmainlyabout? A.AconsiderateteacherhelpedFred. B.Astrong﹣willedboyovercamehimself. C.Asickmotherrecoveredfinally. D.Athoughtfulboyhelpedasickmother.
AstronomershavediscoveredthatthreeplanetshavesizesandtemperaturessimilartoofEarth. A.them B.these C.those D.ones
已知抛物线x2＝4y的焦点为F设Ax1y1Bx2y2是抛物线上的两个动点如满足y1+y2+2＝|AB|则∠AFB的最大值
Theboytheteachersconsideredwascaughtintheexamwhichsurprisedusverymuch. A.tobethebest;cheating B.asthebeststudent;tocheat C.beingthebest;cheating D.asagoodstudent;tocheat
FabienCousteauwasbornwithdeeplovefortheocean.Hisgrandfatherandhisfatherwereoceanexplorersanddocumentaryfilmmakers.Fabienspenthisearlyyearsonhisgrandfather'sships.TodayFabienfollowsinhisfamily'sfootstepstoprotecttheplanet'sendangeredoceanlife.Withhisvastknowledgeandexperiencehetriestostrikeabalancebetweenenvironmentalproblemsandmarketeconomies. Fabieniswellknownforhisstudyofsharks.During2000﹣2002hecreatedaTVspecialcalledAttackoftheMysterySharkbasedonthesharkattacksthatoccurredalongtheNewJerseyshorelineinthesummerof1916.Thenin2003﹣2006withthehelpofalargecrewFabiencreatedasharksubmarine潜艇thatenabledhimtoputhimselfinsidethesharkworldprovidingpeoplewitharareviewofthemysteriousandoftenmisunderstoodcreatures. Forthenextfouryears2006﹣2010FabienwaspartofaseriescalledOceanAdventureswhichofferedararelookintosomeofthemostfantasticoceanspecies物种andenvironments. In2010FabienstartedPlantAFishanonprofitprojectforchildrentohelprestorelocalwaterecosystemsbyreplantingkeyoceanspecies.Savetheworldonefishatatime.Theprojectisstillinprogressnowanditsfinalgoalistoplant1billionfishworldwide. FromJune1toJuly22014Fabienandhisteamspent31daysunderwatertoresearchhowclimatechangeandpollutionareaffectingtheoceans.Fabien'sMission31brokenewgroundbygoingdeeperlongerandfurtherexposing显露theworldtotheadventureandthemystique神秘ofwhatliesbeneath. FabieniscurrentlyworkingonadocumentaryfilmabouttheadventuresofMission31aswellasbuildinganOceanLearningCentertoprovidechildrenaroundtheworldwiththeopportunitytolearnaboutoceansandengagewithoceanexplorersdirectlythroughsocialmedia. 1WhatisNotFabien'sjob? A.Oceanexplorer B.Documentaryfilmmaker C.Environmentalist D.Mediamanager 2HowisParagraph2developed? A.Byprovidingfacts. B.Byofferinganalyses. C.Bymakingcomparisons. D.Bydrawingconclusions. 3Wecanlearnfromthetextthat. A.Fabien'sPlantAFishprojecthasalreadyachieveditsfinalgoal B.Fabien'sMission31broketherecordsofformeroceanexplorations C.Fabien'sTVspecialaboutsharksisbasedonhischildhoodexperiences D.IttookFabienfouryearstoproduceOceanAdventuresallonhisown 4Inwhichpartofawebsitecanwereadthetext? A.ModernTechnology. B.SpaceExploration. C.OutstandingFigures. D.FantasticWildlife.
若z＝1+2i则＝
有5支彩笔除颜色外无差别颜色分别为红黄蓝绿紫．从这5支彩笔中任取2支不同颜色的彩笔则取出的2支彩笔中含有红色彩笔的概率为
若a＞b＞10＜c＜1则
下列说法错误的是
已知函数fx＝|2x|+|2x+3|﹣2．求不等式fx≤3的解集．
Asasenioryearstudentyoumayhavesomanypressurescomingfromsomanydirectionsthatyoucan'tfigureoutwhattodofirst. 1. Whenyouhavemanythingstodoandalotofdemandsonyourtimeyoucanlosesightofwhat'simportant.Oneofthebestwaystoseethebigpicture﹣whatyouwantoutoflife﹣istolayoutyourgoals. PressurePointsandHowtoDealWithThem Confusedoroverwhelmed﹣2.Discussyourconcernswithafriendparentorteacher. Theymayhelpyoufindsolutionstoyourproblemsandworries. Beingtoohardonyourself﹣easeuptakeabreakanddosomethingyouenjoy.Daydreamreadabookgooutwithfriends﹣anythingthathelpsyourelax. Problemsproblemsproblems﹣recognizeyourlimits.It'stoostressfultotrytodealwithallyourproblemsatonce.3. Goal﹣SettingTips It'simportanttorememberthatgoalsbelongtoyou﹣nottoyourparentsyourteachersoryourfriends.Afteryou'vesetyourgoalsidentifytheskillsyouhavetoachievethosegoals.4dosomeresearch.Trythelibraryyourguidanceadviserandteachersandotherpeoplewhocouldhelpyou. 5.Ifyourgoalissomethingyounolongerwantchangeit.Identifythebarrierstogettingyourgoals.Considerwaystoovercomethem.Don'tgetdepressedbyabiglong﹣termgoal﹣seewhatstepsyoucantaketoachieveitandsetthosestepsdownasshort﹣termdo﹣ablegoals. A.Balancinggoalsinlife B.Toomuchtodo C.Goalsexisttoserveyou D.Talktosomeoneyoutrust E.Ifyou'renotsurewhatskillsyou'llneed F.Aslongasyouknowwhatskillisimportantandwhatisn't G.Choosewhat'smosturgentandsetasidetherestuntillater
IfellinlovewithYosemiteNationalParkthefirsttimeIsawitwhenIwas13.Myparentstookusthereforcamping.OnthewayoutIaskedthemtowaitwhileIranuptoE1Capitana1rockof3300feetstraightup.Itouchedthatgiantrockandknew2Iwantedtoclimbit.Thathasbeenmylife'spassion钟爱eversince﹣3therocksandmountainsofYosemite.I'velongmadeYosemitemy4. About15yearsagoIstartedseeingalotof5liketoiletpaperbeercansandemptyboxesaroundthearea.It's6mewhyvisitorsstartedrespectingtheplace7andtreatedsuchabeautifulhome﹣likeplacethisway. Itried8trash垃圾myselfbutthejobwastoobig.Iwould9anhourortwoonthejobonlytofindtheareatrashedalloveragainweekslater.FinallyIgotso10itthatIdecidedsomethinghadtochange. Asarock﹣climbingguideIknew11aboutorganizinganybigevent.Butin2014togetherwithsomeclimbersIsetadatefora12.Onthatdaymorethan300people13.Overthreedayswecollectedabout6000poundsoftrash.Itwasamazinghowmuchwewereableto14.Icouldn'tbelievethe15wemade﹣theparklookedclean! Eachyearvolunteerscomeforthecleanupfromeverywhere.In2016alone2945peoplepickedup42330poundsoftrashand16132milesofroadway. Ioftenhearpeople17abouttheirsurroundings.IfyouareoneofthemIwouldsaytheonlywaytochangethingsisby18ratherthancomplaining.Weneedtoteachby19.Youcan'tblameothers20youstartwithyourself. 1A.distant B.huge C.narrow D.loose 2A.immediately B.finally C.gradually D.recently 3A.imagining B.painting C.describing D.climbing 4A.garden B.home C.lab D.palace 5A.material B.resources C.waste D.goods 6A.beyond B.against C.over D.within 7A.more B.most C.less D.least 8A.throwingaway B.pickingup C.breakingdown D.diggingout 9A.kill B.save C.wait D.spend 10A.satisfiedwith B.delightedin C.tiredof D.usedto 11A.something B.anything C.everything D.nothing 12A.cleanup B.party C.picnic D.concert 13A.droppedout B.showedup C.lookedaround D.calledback 14A.demand B.receive C.accomplish D.overcome 15A.plan B.visit C.contact D.difference 16A.crossed B.measured C.covered D.designed 17A.talk B.complain C.argue D.quarrel 18A.doing B.thinking C.questioning D.watching 19A.method B.explanation C.example D.research 20A.although B.if C.when D.unless
假如你是李华衡水中学学生会__ChairmanoftheStudentUnion近日你校收到美国友好交流学校RogerManverzSchool学生会__John的邮件希望你校捐赠一批传统文化书籍供该校对此有兴趣的同学阅读请你代表学校给John回复一封邮件邮件中需要包含以下内容: 1.自我介绍; 2.捐赠图书的具体信息; 3.询问对方的收件地址和联系信息. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯. DearJohn Yoursfaithfully LiHua
AlibabaCloudandtheHangzhoucitygovernmentannouncedthelaunchofETCityBrain2.0acloud﹣poweredandAl﹣drivenurbantraffic﹣managementsystemthataimstoincreasethecity'sefficiency. AfterovertwoyearsoftestinginAlibaba'shomebaseETCityBrainhasbecomethenewinfrastructure基础设施forHangzhouwithatotalcoverageof420squarekilometersinareaincludingover1300trafficlights.Over200trafficofficersareconnectedviamobilephonesenablingthemtoreceivereal﹣timealertsonanytraffic﹣relatedemergencies. Inversion2.0thesystemwilloptimizethecity'sfirefightingabilitiesbyprovidingkeyinformationtofirefighterssuchaswaterpressurethenumberandpositionoffirehydrants消防栓inagivenareathelocationofgaspipesandotherdetailstheyneedtoknow.Theinformationisinstantmakingtheentirefirefightingprocessfastersaferandmoreaccurate. CityBraingivesmeaningtodata.ByusingAIandadvancedalgorithms计算程序CityBrainisabletoanalyzealargeamountofdataandturnthemintousefulinformationinreal﹣timespeed. AsaresultofCityBrain'sabilitytopredicttrafficflowdetectaccidentsandprovideinstantfeedbackHangzhouhasdroppedfrom5thtothe57thonthelistofChina'smostcongestedcities.Hangzhouisprobablytheonlycitythatcantellyouhowmanycarsareonthestreetatanygiventime. InthecaseofmedicalemergenciesCityBrainisabletochangetrafficlightssoemergencyvehicleslikeambulancesandfiretruckscanheadtothescenewithoutinterruptionacceleratingtheirarrivaltimeby49%. Dr.WangJiantheheadofAlibaba'sTechnologySteeringCommitteewhoinventedthetermCityBrainsaidthesystemisdesignedtoempoweracitytoactquicklyanddirectly.Itismorethanjustabouttrafficmanagement.It'sreallyabouthowtomakecitymorelivableatatimeofshrinkingnaturalresourcesaroundtheglobe.ItisamatterofsustainabilitywhileusingaslittlenaturalresourcesaspossibleWangsaidThisisjustthebeginning. 1WhatbenefitwillETCityBrainbring? A.Lowercrimerates. B.Efficientgovernment. C.Lesstrafficcongestion. D.Improvedmedicalcare. 2WhichofthefollowingfunctionsofthecityBrainisNOTmentionedinthetext? A.Predictingtrafficflow. B.Givingquickfeedback. C.Changingtrafficlights. D.Handlingtrafficaccidents. 3Whichofthefollowingbestexplainsoptimizeinparagraph3? A.Better. B.Practise. C.Operate. D.Emphasize. 4Whatcanweconcludefromthelastparagraph? A.ETCityBrain2.0isafullydevelopedversion. B.Alibabatargetsenvironmentally﹣friendlydevelopment. C.Thegovernmentisdevotedtoimprovingthesystem. D.Thesystemcansolvetheproblemoflackofresources.
IfyouliveinWashingtonD.C.orRedwoodCalif.youmayhaveglimpsedasmallboxyrobotrollingalongalocalsidewalkmindingitsownbusinessbutattractingtheattentionofmanyacuriousonlooker. TherobotswhichlooklikeelectricricecookerswithwheelswerepartofapilotprogramlastyearbyStarshipTechnologiesfocusedondeliveringmealsfromlocalrestaurantsindozensofcitiesaroundtheworld. Thisweekthecompanyrevealedplanstobroadenit'sdeliveryservicebeyondfoodtoincludepackagesamovethatmadeittheworld'sfirstrobotpackagedeliveryservice.ThepackagedeliveryserviceisonlyavailableinsomecitiesintheUS. Thewheeledrobotshaveatopspeedof4mphandandcandetectbarriersfromasfaras30feetaway.TherobotcanoperatethroughjustaboutanythingsaysNickHandrickheadofoperationsforStarship'sD.C.officeIfyouhavesomethinginthewayit'sabletoclimbit.BygivingcustomerscontrolofwhendeliveriesoccurStarshipTechnologiesispromotingitsserviceasawaytocombatpackagetheft. Tosignupfortheservicewhichcostsalittlemorethan﹩10permonthcustomersneedtodownloadthecompany'sapp.CustomersthencreateaStarshipDeliveryAddressauniqueaddressinsideaStarshipfacilityinsteadofahomeaddresswheretheycanhavepackagessentfromplacessuchasAmazon.com. OnceapackageisdeliveredtotheStarshipaddresscustomersreceiveatextnoticethatallowsthemtoscheduleahomedeliveryviarobot.Therobotsareopenedbycustomerswithamobilephonecode代码. 1WhatdoweknowaboutStarshipTechnologiescompany? A.PackagesaredeliveredbyitsrobotsallroundAmerica. B.Itsrobotshavetakenonpackagedeliveryforalongtime. C.Itisthefirsttoproviderobotpackagedeliveryservice. D.Itsdeliveryserviceisthebestofallintheworld. 2WhatdoestheunderlinedwordcombatinParagraph4probablymean? A.Delay B.Prevent C.Report D.Discover 3Whatcanwelearnaboutrobotpackagedeliveryservice? A.Customerscan'topentherobotswithoutamobilephonecode. B.StarshipDeliveryAddressisthecustomer'shomeaddress. C.Customershavetopayalittlemorethan﹩10eachtime. D.Robotsthemselveshavecontroloverwhentodeliverpackages. 4Whatmaybethebesttitleforthepassage? A.RobotDeliveryServiceIsTakingOff B.HumansAreBeingReplacedbyRobots C.EverythingCanBeDonebyRobots D.PackagesCanBeDeliveredbyRobots
ManylanguagesaredisappearingandlanguagessuchasEnglishSpanishandChineseareincreasinglytakingover.YetMaoripromisestohavearosyfuturegiventhatNewZealandersareshowinggreatenthusiasmforspeakingthislocallanguage. AMaorirenaissance复兴blossomedinthe1970saslanguageactivistschampionedtheircauseandMaorifoughtforgreaterpoliticalpower.Butuntil2013just3.7percentofNewZealandersspokethelanguagefluentlyandmanypredicteditwouldsoondieout.NowNewZealand'sgovernmentiserasingprejudiceandstrugglingtoincreasethepercentofpopulationwhocanspeakbasicMaoriby2040to20.PrimeMinisterJacindaArdernsaidlastmonththathernewborndaughterwouldlearnbothMaoriandEnglish.It'sanofficiallanguagesowhyshouldwedismissitsuniversalavailabilityanditsmuchmorecommonuse?saidMs.Ardernaddingthatshealsoplannedtostudythelanguage.Grassrootsarealsospreadingitbywordofmouth.Answeringthephonewiththegreetingkiaorahelloorendinganemailwithngamihi'thankshasbecomeafashion.MaoriisgraduallybecomingpartofNewZealand's mainstreampopularculture. AjitKumarSamahafamousprofessorinAucklandUniversitypublishedabook﹣Contagious:whyMaoricatchesonwhereheintroducesreaderstothepopularityofMaoriandexpresseshisgreatanxietyforthelackofteacherswhohavethecompetencetoteachtheMaorilanguage. Peoplearenotonthesamewavelengthhowever.SuggestionsonofficiallyreplacingEnglish﹣languageplacenameswithtraditionalMaorioneshavebeenrejected.SowhenapolicecarwasdesignedusingMaoriitwascondemnedbysomeasridiculousbecauseofthehigherMaoriratesofarrestandimprisonment. 1Howdoestheauthorintroducethetopic? A.Byprovidingusefuldata. B.Bymakingacomparison. C.Byapplyingfamoussayings. D.Byofferinggoodtips. 2Whatdowelearnfromthesecondparagraph? A.TheMaorilanguagethreatenstheriseofEnglish. B.There's11be20%fluentMaorispeakersby2040. C.ArdernisopenlysupportiveoflearningMaori. D.PeoplewithdrawfromtheactofspeakingMaori. 3WhatcanweknowaboutAjitKumarSamah? A.HepopularizestheuseofMaori. B.HeseesMaoriasanunofficiallanguage. C.HerejectsthereplacementofEnglishwithMaori. D.HeadvocatestrainingcompetentMaoriteachers. 4Whatcanbeasuitabletitleforthetext? A.TheBrought﹣to﹣lifeMaoriLanguage B.ToSpeakorNottoSpeakMaori C.HowtoHaveGreatFluencyinMaori D.TheEvolutionoftheMaoriLanguage
已知椭圆E+＝1a＞b＞0的半焦距为c原点O到经过两点c00b的直线的距离为c． Ⅰ求椭圆E的离心率 Ⅱ如图AB是圆Mx+22+y﹣12＝的一条直径若椭圆E经过AB两点求椭圆E的方程．
I'msuremanyofyouarefamiliarwiththeNewYear'sresolution决心﹣﹣‘get1'AfteraChristmasofstaving2.watchingtelevisionandeatingfartoomuchchocolateIdecidedenoughwasenough.Januarywasgoingtobe3.Januarywasgoingtobethestartofthenew.healthyme﹣lesschocolate.more4anall﹣roundhealthierlifestyle.ButhowwasIgoingtodothis?AsI5theInternetlookingforinspirationIrealizedjusthow6Iknewaboutwaystogetfit.7exerciseIhadalwaysthoughtyoueitherplayedateamsportlike8orwenttothegym.AndwiththearrivalofJanuarysnowplayingfootballoutsidedidn'tseemlikediebestoption.andasIhaveadeep﹣rootedterrorof9runningmachinesthegymwasn'tgoingtoworkouteitherPlusEveneverquiteunderstoodtheconceptof10toruninsidewhenyoucouldrunoutsideforfree. 11IknewthatIneededtoresearchmyoptionsfurther.ThefirstthingIfoundwastheworldofYouTubeexercisevideos.Therearevideosforjustabouteverything.The12thingaboutYouTubevideosisthattheyarefreetheyare13youcandothemwheneveryouwantandyoudon'thaveto14yournicewarmhousetodothem.But15youdothemwithafriendit'stoughto16yourselftokeepgoingandwithoutaninstructortherewithyouit'ssometimeshardtoknowifyou'redoingthemove17. Ithenresearchedlocalfitnessclassesandfoundmysmalltowntobeabsolutelyswimmingwith18!Iquicklysigneduptotheoverallsportsclubhadalookattheweeklytimetableand19totrythemallout.SofarIhavetriedoutmostofthem.My20onesarebyfarthedance﹣basedonesthattakeplacetomusicbecauseitmakesexercisesomuchmorefun! 1A.rich B.fit C.busy D.ready 2A.alone B.abroad C.inactive D.positive 3A.hard B.similar C.relaxing D.different 4A.workouts B.foods C.fun D.sleep 5A.looked B.surfed C.checked D.enjoyed 6A.few B.much C.little D.many 7A.Incaseof B.Inadditionto C.Intermsof D.Inspiteof 8A.tennis B.basketball C.badminton D.football 9A.gettingoff B.takingoff C.givingoff D.fallingoff 10A.paying B.planning C.practicing D.playing 11A.Therefore B.However C.Besides D.Otherwise 12A.serious B.confusing C.wonderful D.amusing 13A.cheap B.flexible C.useful D.safe 14A.clean B.leave C.build D.buy 15A.if B.though C.since D.unless 16A.force B.encourage C.stimulate D.motivate 17A.smartly B.quickly C.correctly D.beautifully 18A.opportunity B.danger C.pressure D.patience 19A.agreed B.decided C.believed D.advised 20A.favorite B.creative C.ordinary D.regular
已知A31B﹣40P是椭圆上的一点则PA+PB的最大值为．
IfeltbutterfliesinmystomachwhenIstartedcalligraphyclasstenyearsago.IwonderedwhatIwasdoingthere.AtthatmomentIcouldn'thaveknownthatI'djustmadeoneofthebest1chooseofmylife. Isatdownandlistenedtotheteacherintroducingthetoolsofthecraft.Then2wasthefirsttimeformethatIhadtriedmyhand.Itookupthebrushusingthecorrectgesture3dipitintheinkandcarefullywroteone4Chinese. Over5pastfiveyearsIhavelearnedtomakeversionsofwell﹣knownpoems.Calligraphyseemedlikeabridge6connectedmetoauthorsfromcenturiespast.Stroke笔画bystrokewordbywordIcouldfeeltheiremotionscherishedmyownpeaceandlearned7appreciatemydailylife. Nowcalligraphyisnotjustahobby8awaytoremovemyselffromtheworriesoflife.RollingoutthepaperIcanwriteforawholeday.Calligraphy9ablemetobalancemybusyscheduleandlive10peace.
ChinaTrainGuide QuickGuideonChinaTrainTravel Ifyou'relookingforanaffordableandcomfortablewaytogetaroundChinatraintravelisthewaytogo.Gettingtraininformationandcheaptrainticketshasneverbeeneasier.OnlinetrainticketbookingmakesiteasyfortravelerstolookthroughChina'straintimetablecomparetrainfaresandlookforticketavailability.Onceyou'vefoundasuitabletrainyoucanbookonlineandpickyourticketsupatthetrainstationorgetthemdeliveredtoyourhomeorhotel.Trainticketscanbebookedonlineaminimumof35minutesandamaximumof60daysbeforedeparture. Howtochoosetraintypes Whenyou'rebuyingChinatrainticketsonlineyou'llnoticethatthejourneydurationdiffersdependingonwhichtypeoftrainyouchoose.ChinatraintypescanberecognizedbytheirlettercodesGDandCtrainsarehigh﹣speedtrainswhileZTandKareslowerorovernighttrains.China'shigh﹣speedtrainsrunbetweenChineseprovincialcapitalsandfirst﹣tierChinesecities.Gtrainshigh﹣speedtrainsstandingforgāotiěareChina'sbullettrains﹣thefastesttrainswithamaximumspeedof400km/h.Ticketsforthesetrainsarethemostexpensive. Howtobuytraintickets UnlessyoucanreadChinesethereareonlytwowaystomaketrainreservationsinChina: ﹣Onlinetrainticketbookingwithatravelagencyupto60daysbeforedeparture. ﹣Atthetrainstation/localticketagencywithyourpassportupto58daysbeforedeparture. Howtoreadtraintickets WhenreadingyourtrainticketpleasetakenoteoftheChinesecharactersandPinyinprintednexttoyourdeparture/arrivalcity.DirectionsNorthSouthEastandWestappearinPinyinBeiNanDongandXinotEnglish.Pleasemakesureyouaregoingtothecorrecttrainstation. 1Whatcanwelearnfromthefirstparagraph? A.It'sdifficulttogettraininformationinChina. B.Youcangetonthetrainwithoutticketsafterbookingonline. C.TravelingbytraininChinaisnotveryexpensive. D.Trainticketsonlineareavailableatanytimewithin60daysbeforeyouleave. 2IfMr.SmithneedstotravelfromJinantoBeijingforsomethingurgenthe'dbettertake. A.Gtrains B.Ztrains C.Dtrains D.Overnighttrains 3Whoaretheintendedreadersofthepassage? A.Nativetourists. B.Travelagencies. C.Businessmen. D.Foreigntravelers.
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