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在等差数列{an}中，公差d＞0，a1+a6=14，a2a5=40，则数列{an}的前9项之和等于 90 ．
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高二下学期数学《》真题及答案
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某数列既成等差数列也成等比数列那么该数列一定是
公差为0的等差数列
公比为1的等比数列
常数数列1，1，1…
以上都不对
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数与
设等差数列an的前n项和为Sn若a1=-5且它的前11项的平均值是51求等差数列的公差d2求使Sn＞
下列说法①公差为0的等差数列是等比数列②b2＝ac则abc成等比数列③2b＝a＋c则abc成等差数列
0个
1个
2个
3个
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数与
已知数列是首项为1公差为1的等差数列是公差为d的等差数列是公差为d2的等差数列d≠0.Ⅰ若a20=3
数列的通项公式则此数列是.
公差为2的等差数列
公差为5的等差数列
首项为2的等差数列
公差为n的等差数列
数列的通项公式则此数列
是公差为5的等差数列
是公差为2的等差数列
是首项为5的等差数列
是公差为n的等差数列
已知则数列是
公差为9的等差数列
公差为
的等差数列
公差为4 的等差数列
不是等差数列
已知公差不为0的正项等差数列｛an｝中Sn为前n项之和lga1lga2lga4成等差数列若a5=10
数列的通项公式则此数列是.
公差为2的等差数列
公差为5的等差数列
首项为2的等差数列
公差为n的等差数列
阅读我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个
数列{an}的通项公式an＝2n＋5则此数列.
是公差为2的等差数列
是公差为5的等差数列
是首项为5的等差数列
是公差为n的等差数列
由公差为d的等差数列a1a2a3重新组成的数列a1+a4a2+a5a3+a6是
公差为d的等差数列
公差为2d的等差数列
公差为3d的等差数列
非等差数列
在1和10之间插入10个数使其成等差数列则该等差数列的公差为______
等差数列a1a2a3an的公差为d则数列ca1ca2ca3canc为常数且c≠0是
公差为d的等差数列
公差为cd的等差数列
非等差数列
可能是等差数列，也可能不是等差数列
等差数列中则数列的公差为
1
2
3
4
若数列{an}中an≠0n≥1a1＝前n项和Sn满足an＝n≥2则是
首项为2、公比为
的等比数列
首项为2、公比为2的等比数列
既非等差数列也非等比数列
首项为2、公差为
的等差数列
首项为2、公差为2的等差数列
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数与
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下列等式成立的是
Itisessentialtolearnhowtocommunicatewithpeoplefromotherculturesinordertobuildgoodrelationswiththem. 1 Alittleknowledgecangoalongway.Ifyouhavetimebeforemeetingwithsomeonefromanotherculturetrytotaketimetolearnthebasicdosanddon'tsofthatculture.Youcanfindinformationonthisfrominternetsources. Berespectfulandtolerant Eachculturehasitsownsetofdominantvalues主导价值观beliefsandprejudices.Youshouldn'tjudgepeoplebasedonthesedifferences.2Youmayevenlearnsomethingnew. Speakclearlyandslowlyifnecessary. Donotshoutortreatothersasthoughtheydonotunderstand.Raisingyourvoicedoesnotmakeyoueasiertounderstand.3Communicationdifficultiesarisefromdifferencesnotbecauseofmattersofintelligence. Avoidslangunlessyouareabsolutelysure. 4What'sworseitmayberegardedasveryoffensive.Itisbesttoavoidthemaltogetherunlessyouareabsolutelysureyouknowhowtousethemproperly. Understandrulesregardingtouching. Someculturesmayexpectmorephysicalcontactbetweenpeoplewhencommunicatingthanotherculturesdo.5Don'ttakeitasoffensiveifanothercultureismoreorlessphysicalthanyouareusedto.Ifyouareuncomfortableletothersknow. A.Usingnon﹣standardlanguageimproperlycanmakeyouhardtounderstand. B.Insteadrespectthemforwhattheyareandtoleratethem. C.Itiscommonfordifferentculturestousefacialexpressionsdifferently. D.Learnabouttheculturebeforehand. E.Forexamplesomeculturesmayshakeortouchhandsmorewillinglythanothers. F.Thisisbecausecertainposturescanbeseenasoffensivetoothers. G.Donottreatotherpeopleasthoughtheyareunintelligent.
Areyoufacingasituationthatlooksimpossibletofix? In1969thepollutionwasterriblealongtheCuyahogaRivernearClevelandOhio.It1beunimaginablethatitcouldeverbecleanedup.Theriverwassopollutedthatit2actualcaughtfireandburned.Nowyearslaterthisriverisoneof3mostoutstandingexamplesofenvironmentalcleanup. Buttheriverwasn'tchangedinafewdays4evenafewmonths.Ittookyearsofwork5reducetheindustrialpollutionandcleanthewater.Finallythathardworkpaidoffandnowthewaterintheriveris6cleanthanever. Maybeyouarefacinganimpossiblesituation.Maybeyouhaveahabit7isdrivingyourfamilycrazy.Possiblyyoudrinktoomuchordon'tknowhowtocontrolyourcreditcarduse.Whenyoufacesuchanimpossiblesituationdon'tyouwantaquickfixandsomethingtochangeimmediately? Whilethereare8amazestoriesofinstanttransformationformostofusthe9changearegradualandrequirealotofeffortandworklikecleaningupapollutedriver.Justbe10patience.
关于x的方程x2+2m﹣1x﹣4m＝0的两个实数根分别是x1x2且x1﹣x2＝2则m的值是．
Fournationalparksworththetrip CarlsbadCavernsNational ParkNewMexico InCarlsbadCavernstherearemorethan119cavesincludingthemaincavewiththemile﹣longBigRoomwalkinside.TheparkissetalongNewMexico'squietsouthernborder.MaketimetoalsoexplorethesurroundingChihuahuanDeserthometothemostdiversecollectionofcactus仙人掌species物种intheworld'sdeserts.InsummervisitorscanwatchhalfamillionBrazilianfree﹣tailedbatsfilltheeveningskies. Tel575﹣785﹣2232 Price﹩10perpersonkids15andunderfree ChannelIslandsNationalPark California JustoffthecoastofVenturathefivePacificChannelIslandsoffer160milesofpristine原始的coastline.Youcanreachtheislandsbyboatorplane.OncethereyoucanseegraywhalesRisso'sdolphinsandelephantsealswhileonawhale﹣watchingtourorsearchfortherarenativespeciessuchasislandfoxes. Tel805﹣658﹣5730 Pricefree IsleRoyaleNationalPark Michigan IsleRoyaleisa570000﹣acreislandinthenorthwestofMichigan'sLakeSuperior.Eachsummervisitorsgotherebyferryorseaplanetoexploretheisland's19th﹣centuryshipwrecks沉船learnabouttroutandwhitefishorpaddletheplentifulwaterwaysbyboat. Tel906﹣482﹣0984 Price﹩4perpersonkids10andunderfree DryTortugasNationalPark Florida DryTortugas﹣﹣﹣aremoteislandabout70mileswestofKeyWestandduenorthofHavana﹣﹣﹣﹣isanidealplaceforswimmers.Infactthemajorityofthepark's100squaremilesareactuallyunderwater.VisitorscantakeaboatferryorseaplanetoDryTortugaswherethey'lldiscovershipwrecksseaturtlesandnearly300typesofbirds. Tel305﹣242﹣7700 Price﹩10perpersonforsevendayskids16andunderfree 1HowmuchshouldacouplewithtwolittlebabiespayforCarlsbadCavernsNationalPark? A.﹩40. B.﹩30. C.﹩20. D.﹩10. 2Whichplaceisthebestchoiceforsomeonefondofboating? A.Florida. B.Michigan. C.California. D.NewMexico. 3Whichparkshouldaswimminglovervisit? A.IsleRoyaleNationalPark. B.DryTortugasNationalPark. C.ChannelIslandsNationalPark. D.CarlsbadCavernsNationalPark.
为了解中考体育科目训练情况长沙市从全市九年级学生中随机抽取了部分学生进行了一次中考体育科目测试把测试结果分为四个等级A级优秀B级良好C级及格D级不及格并将测试结果绘成了如下两幅不完整的统计图．请根据统计图中的信息解答下列问题 1本次抽样测试的学生人数是 2图1中∠α的度数是并把图2条形统计图补充完整 3若全市九年级有学生35000名如果全部参加这次中考体育科目测试请估计不及格的人数为． 4测试老师想从4位同学分别记为EFGH其中E为小明中随机选择两位同学了解平时训练情况请用列表或画树形图的方法求出选中小明的概率．
How'syourhappinessquotient指数?Sciencetellsusthatifyouwanttoincreaseyourhappinessquotienteverydayit'simportanttotaketimeandacceptthepresentblessings恩赐inyourlife. Iwantedtoshareamomentoffeelingaboutsomeofmyblessingsandwhat'sinmylifetobegratefulforasThanksgivingapproaches. OneofourfamilytraditionsatourThanksgivingmealistogoaroundthetableandtoleteachonesharesomethingwe'reespeciallythankfulfor. I'mgoingtorecitelotsofthingsincludingthatI'mgratefulformyhealthmylovinghusbandandthewonderfulrelationshipweshare.Myhusbandjoinsmefor3﹣milewalktostartourday.Theexercisehabitkeepsourmoodsincheckandtheupsanddownsoflifeeasiertomanage.Wetalkaswewalksharingideasworriesandgoodfeelingstoo.Sometimeswearguealittleuntilwefigureoutwhattodo.Wealwayscomeupwithsomething.Whatablessingthatis! Itissomuchtobegratefulfor.IfeelIamtheluckiestwomanalive.It'smywishforyouthatyou'llbeabletospotsomethinginyourlife.Ihopeyetyouwillsavor体味andappreciateit. Manyofusspendtheholidaywithouragingparentsorotherlovedones.InmyworkatAgthgParents.comwejustremindedeveryonethatyouneverknowiftherewillbeanotherThanksgivingwiththeselovedones.Wecan'ttakethedayforgranted.Justbeinthemoment.Wesuggestthatyouverballygivethankstoyourparentsnomatterwhatconditionsyouragingparentsmaybeinnow.Dowhatyoucantobetunedintowhatyouneedaswellaswhatyourfamilyneeds. 1What'sthebesttitleforthetext? A.WhyI'msolucky? B.HowIspendmyThanksgivingDay? C.Howtoincreasehappinessquotient? D.Whatishappinessquotient? 2TheunderlinedwordspotinParagraph5canbereplacedby. A.create B.discover C.do D.affect 3Fromtheauthor'sexperienceswecaninferthat. A.shelivesahappylife B.sheshouldthankeveryone C.shehadanunfortunatelife D.shelikesstayingwiththeold
1计算﹣12019+﹣﹣2﹣|2﹣|+4sin60° 2先化简再求值1﹣÷其中a＝+2
WhentheQueenofEnglandandtheRoyalFamilygearupfortheirlatestpublicgalaorpartyatBuckinghumPalaceinvitedguestsmightnoticethatsomethinghaschanged.Whentheyenjoyrefreshments茶点intheroyalresidencetheywillfindtheuseofplasticmaterialsgreatlyreduced.Gonearetheplasticstrawstraysandplates.TheQueenishopingwithheractionstocallattentiontotheimportantissueofplasticwasteintheworldtoday.Indeedit'sabouttimethatworldgotitsacttogethertofacethisissue. Eachyeartheworldproducesaround300milliontonsofplasticwaste.Ofthatamountonlyabout10percentisrecycled.Mostofplasticwastefindsitswayintolandfills垃圾填埋场butasignificantamountofit﹣around30milliontons﹣endsupintheworld'soceanseveryyear.Thesenumbersarescary.Andtheyshouldbebecausethereispotentialforplasticwastetodestroythewholeworld. AtMidwayAtollinthePacificOceanfloatsamassofplastic.Thealbatrossbird信天翁thatcallstheislandhomeregularlyconsumestheplasticthinkingitisfood.Thisiskillingofftheseendangeredbirds.Thebodiesofdeadbirdsrotrevealingpiecesofplasticintheirstomachs. Scientistspredictthattherewillbemoreplasticthanfishbyweightintheoceanby2050.Thefishlikethealbatrossconsumetheplasticpieceswhichendupinthefoodthatweeat.Between14to16percentoftheworld'sanimalproteincomesfromthesea.Overonebillionpeoplerelyonseafoodastheirprimaryfoodsource.Plasticwastecouldliterallydestroythelivesofbillionsofpeopleworldwide. Thetimetodealwiththisworldwideepidemic流行病haslongbeenoverdue.TheQueenisleadingbyexample.Everyoneofusneedstofollowherlead.Ifwedon'tplasticwon'tjustbewhatweusetoeat﹣﹣itwillbeonthemenuaswell. 1Accordingtothearticleofplasticwastefindsitswayintotheworld'soceaneveryyear. A.one﹣tenth B.one﹣ninth C.one﹣eighth D.one﹣fifth 2Accordingtothearticlewhichofthefollowingstatementsistrue? A.Fishermensuffermostfromplasticpollution. B.Puttingplasticwasteinlandfillsisenvironmentallyfriendly. C.Thealbatrossbirdisendangeredpartlyduetoplasticpollution. D.Alargernumberofplasticparticlesthanfishwillbefoundintheoceanby2050. 3Whatdoestheunderlinedwordoverdueinthelastparagraphmean? A.ignored B.appreciated C.concerned D.delayed 4Whatistheauthor'spurposeofwritingthearticle? A.Tosolvetheproblemofplasticpollution. B.TopraisetheQueenofEnglandandtheRoyalFamily. C.Toarousepeople'sinterestinoceanprotection. D.Toraisepeople'sawarenessofplasticpollution.
Peoplewithcolourblindnesscan'tseecoloursinanormalway.Colourblindness1affectapproximately1in12menand1in200womenintheworld. Therearevariouscausesofcolourblindness.Forthemajorityofcolour﹣blindpeopletheconditionissomethingtheyhavefrom2bearalthoughsomepeoplegetitlaterinlifebecauseofdiseases. Mostcolour﹣blindpeoplecanseethingsasclearlyasotherpeoplebut3areunabletofullyseeredgreenorbluelight.Therearedifferenttypesofcolourblindnessandthereareextremelyrarecases4peopleareunabletoseeanycolouratall.The5commonformofcolourblindnessisred/greencolourblindness.Although6knowasred/greencolourblindnesstheformofcolourblindnessdoesn'tmeansufferers7meremixupredandgreen.Itmeanstheymixupall8colourthathavesomeredorgreenaspartofthewholecolour. Theeffects9colourblindnesscanbemildmoderate中等的orsevere.Approximately40%ofcolourblindpeopleareevenunawarethatthey'recolourblind.Statistically10speakmostpeoplewithamoderateformofred/greencolourblindnesscanonlyidentify5colouredpencilsfromastandardboxof24pencilcrayons.
Notlongbeforemydaughter'sshoeswerescratched划破withaknife.Sheburstintotears.Itookthemtotheshoemaker's. Theyoungapprentice学徒glancedatthe1andsaidNothingIcandoexcept2theupper.HismasterlookedatthemandsaidIfyou3meIwilladdmorescratchesonboththeshoes. Iwas4andaskedwhy. HeexplainedAsiftheopeningweremade5foraspecialstyle. Ididn'tfullyunderstandhim6Idecidedtoleavetheshoes. TwodayslaterIdroppedbyfromworkto7theshoes.Ifoundmorescratchesoneachshoealltheopeningswerepatched缝补bysoftredleatherthestitches针脚weretwistedwiththeappearancelookingmore8andinterestingthanever.Icouldn'thelppraisingthemaster's9. Anothertimemysister'sblousewastornleavingalargeopening.Mywifecheckedit10andthensaidLetmetakeithomeand11it. ThreedayslaterseeingitagainIwasgreatly12allthetornpartstookonalookoficecrystal水晶attachedtoitwasasnowmanmadeoffloweryrags.Isighedwith13It'samazing! Iwas14bythatshoemaker.Patchesareconsideredtobe15butaskillfulcraftsman工匠canmakeittakeonakindof16.repliedmywife. Herwordsinspired启发memoreperfectionisimpossibletoachievein17patchesappearinthe18ofinjurydisabilityordisease.Sinceyoucan'tchangetheexistenceofwoundyoushouldnot19people'ssympathy同情bydisclosingthewoundwhichismeaningless.Justsew缝the20bypatchesandproduceamostbeautifulfloweronitandthatisthesignificanceoflife. 1A.scar B.opening C.hole D.mark 2A.replace B.remove C.throw D.tear 3A.tell B.show C.agree D.trust 4A.delighted B.confused C.excited D.astonished 5A.onpurpose B.bychance C.inparticular D.inturn 6A.so B.and C.as D.but 7A.bring B.collect C.see D.return 8A.successful B.skillful C.attractive D.positive 9A.skill B.drill C.performance D.strength 10A.anxiously B.suddenly C.carefully D.delightedly 11A.wash B.iron C.save D.mend 12A.puzzled B.disappointed C.surprised D.touched 13A.anger B.regret C.praise D.care 14A.encouraged B.inspired C.moved D.attracted 15A.common B.beautiful C.ugly D.rare 16A.difference B.perfection C.newness D.change 17A.future B.mind C.life D.place 18A.form B.name C.shape D.need 19A.treat B.accept C.ignore D.expect 20A.wound B.pain C.injury D.disability
温度由﹣4℃上升7℃是
分解因式x3﹣9x＝．
TheBritishareknownfortheirsenseofhumor.Howeveritisoftendifficultforforeignerstounderstandtheirjokes.ThemainpointtorememberisthattheBritishoftenuseunderstatement. Understatementmeanssayinglessthanyouthinkorfeel.ForexampleifsomeonegetsverywetinashowerofrainhemightsayItsalittledamp潮湿的outside.OrifsomeoneisveryimpoliteandshoutsatanotherpersonsomeoneelsemightsaySheisn'texactlyfriendly.Understatementisoftenusedinunpleasantsituationortomakeanotherpersonlooksilly.UnderstatementplaysanimportantpartinBritishhumor. AnotherkeytounderstandingBritishhumoristhattheBritishliketomakefunofthemselvesaswellasothers.Theyoftenlaughaboutthesillyandunpleasantthingsthathappentooureverydaylifewhensomeoneaccidentallyfallsoverinthestreet.Theyalsoliketomakejokesaboutpeoplefromdifferentclassesofsociety.Theyliketomakejokesabouttheiraccentsthewaytheydressandthewaytheybehave.What'smoretheBritishlovetowatchcomediesaboutpeoplewhodonotknowhowtobehaveinsociety.ThecomediesseriesMr.Beanisagoodexampleofthiskindofhumor. Mr.BeanisthecharactercreatedbyBritishactorRowanAtkinsonin1990.Mr.Beandoesn'ttalkoftenandinsteadheuseshisbodymovementandfacialexpressionstomakepeoplelaugh.PerhapswhatmakesMr.Beansofunnyisthathedoesthingsthatadultsintherealworldcannotdo.Mr.BeanispopularinmanycountriesaroundtheworldbecauseyoudonothavetospeakEnglishtounderstandthehumor.BecauseofthismanypeoplehavebecomefamiliarwiththeBritishsenseofhumor. 1WhyisitdifficultforforeignerstounderstandBritishjokes? A.TheBritishoftenenlargethefact. B.Britishjokesareconnectedwithmanydifferentcultures. C.TheBritishtrytomakeoutthatsomethingislessimportantthanitis. D.Britishjokesarenotasfunnyasjokesinothercountries. 2Theauthorexplainsunderstatementby. A.usingexamples B.makingcomparisons C.followingtimeorder D.describingaprocess 3Mr.Beanmakespeoplelaughby. A.tellingfunnystories B.makingjokesaboutothers'accent C.copyinghowothersbehave D.usinghisbodymovementandfacialexpressions 4Whatcanbethebesttitleforthetext? A.BritishHumorinComedy B.HumorinDifferentCultures C.DevelopingYourSenseofHumor D.UnderstandingBritishHumor
如图点A点B分别在y轴x轴上OA＝OB点E为AB的中点连接OE并延长交反比例函数y＝x＞0的图象于点C过点C作CD⊥x轴于点D点D关于直线AB的对称点恰好在反比例函数图象上则OE﹣EC＝．
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每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∧并在其下面写出该加的词. 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.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. LastweekIgotthefirstprizeintheEnglishSpeechContestholdinourschoolthatmademeveryexcited.IusedtobetooshynottospeakEnglishinpublic.ItwasSusanwhoasksmetopracticeseveraltimesinherofficeandcorrectedmypronunciationandintonation.BesidessheencouragedmebeconfidentandbravewhetherIwantedtoshowmytalentbeforeothers.Ifollowedheradvices.ThatwaswhyIwonthefirstprize.Iamdeepmovedbywhathehasdoneforme.Ioweherathousandthankswithherkindness.
ThejungleisjumpingwithajazzybeatinDisney'sTheJungleBookKIDS.Specially1adaptfromtheclassicDisneyanimatedfilmthismusicalfeaturesahostof2colorcharactersandyourfavoritesongsfromthemovie. ThefearsometigerShereKlanwhobearsthescarsofManpromisestoremove3heseesasathreat.DrivenbyShereKlan4humanboynamedMowgliandhispanther黑豹friendBagheeraareontheruninthedeepestpartsofthejungle.On5theyjourneythetwomeetasnakenamedKaaagroupofelephantsandagiantbearnamedBaloowhoteachesthemtheswingingmusicalrhythmsofthejungle.After6surviveadangerousmeetingwithabandofmonkeysledbyKingLouieMowgliandBagheera7forcetorunfortheirlives.WhenShereKlanreturnsour8heromustbringtheirfellowanimalstogetherintobattleandrestore恢复peacethroughoutthejungle. Themusicalhasalargeensemble剧团andmanystrongfeaturedrolesforgoodsingers.Severalroles9includeBalooandLouiearegreatforkidswithstrongcomedicskills.Thechoruscanbeexpandedtoinclude10varietyofanimalstreesplantsrocksandmanyotherjungleinhabitants.
假定你是李华你的新西兰朋友Terry没有进入学校唱歌比赛的决赛感到非常伤心.请你给他写一封email内容包括 1.表示安慰 2.给予鼓励 3.提出希望. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
Manypeopleseemtolovepotatoeshowevertheyarecooked.Buthaveyoueveraskedyourselfwheretheycamefrom? ItallstartedinPeru.Therepeoplegrewpotatoesover2000yearsago.Theyweren'tliketheonesweknowtoday.1ThefirstEuropeanstotrytoplantpotatoesweretheSpanish.In1537Spanishexplorersdiscoveredpeopleeatingwhattheycalledpapas.TheybroughtthisstrangevegetablebacktoSpaininthe1550s. Peoplegenerallydidn'tlikethepotato.LotsofothervegetableswereintroducedintoEuropeatthesametimeliketomatoesandsweetpotatoesandpeoplepreferredthosetotheunattractivepotatoes.2VeryslowlytheyspreadthroughEurope.ThereisastorythatKingLouisXVIofFrancelikedthepotatoandplantedtheminhisroyalgarden.3 Sowhataboutchips?WelltheBelgiansclaimthattheyinventedfriedpotatoesalthoughnobodyreallyknowsforsure.ThefirstmentionofchipsinEnglandisbythewriterCharlesDickensin1859.4TheAmericanscallthemFrenchfriesbecausesoldiersfromAmericawenttoFranceduringtheFirstWorldWarandlovedthedish.NowtheAmericanseatovertwentymilliontonsofchipsayear. CrispsareanAmericaninventionalthoughtheycallthemchips.EverybodyagreesthatanativeAmericanchefGeorgeCrummadethefirstcrispsin1853.Onedayadifficultcustomerwantedfriedpotatoesslicedthinly.Whentheyarrivedhesaidtheyweren'tthinenough5IntheendCrumgotannoyedandslicedthepotatoesasthinlyashecouldandfriedthemandthenaddedlotsofsalt.Thedishwasanimmediatesuccess. Nexttimeyouareinyourfavouritefastfoodplaceeatingchipswithyourfriendsamazethemwithyourpotatoknowledge! A.Hekeptsendingthembacktobecookedagain. B.Theoriginalpotatoesweresmallerandtastedbitter. C.Theywerefoundtobeagoodsourceofvitaminssurprisingly. D.Hementionedchipsofpotatofriedinoilinoneofhisbooks. E.Heaskedthefriedpotatoestobemixedwithbutterandcheese. F.Ordinarypeoplestolethemandplantedthemintheirowngardens. G.Theyweregiventoslavesandprisonersbecausetheyweresocheap.
At1beginningoftheyear2017thefirstfreight货运trainfromChinatoLondonpulledout.ThetraintraveledfromYiwuWestRailwayStationinZhejiangProvinceEasternChinatoBarkingLondon2take18daystotravelover7400miles. Yiwuisknown3producingsmallgoodsandthetrainmainlycarriedhouseholditemsgarmentsclothbagsandsuitcases.TherouterunsthroughsevencountriessuchasRussiaPolandGermanyandFrancebefore4arriveinLondon.TheUKisthe5eightcountrytobeaddedtotheChina﹣EuropeserviceandLondonisthe15thcity. TherailwayisamajordevelopmenttohelptheBeltandRoadInitiative倡议6startedin2013andisatradenetworkconnectingAsiawithAfricaandEuropealongoldSilkRoadtradingroutes.Thereare7current39routeslinking16Chinesecitiesto＝12Europeancities. UntilJune20161881services8runfromChinatoEurope.ThereturningtrainscarriedgoodssuchasGermanmeatproductsRussianwoodsandFrenchwines. ThetraintoLondonhasstrengthenedthe9connectbetweenChinaandWesternEuropeandimprovedChina﹣Britaintradeties.InthelasttwoyearsChina'stotalexportvaluehasslightlydecreasedandtheBeltandRoadInitiativeispartofaneffort10promote促进tradeandeconomicgrowth.
FlorenceNightingalewasnamedafterherbirthplaceFlorence.Italy.WhenshewasalmostayearoldshereturnedwithherfamilytoEngland. Florenceoftenhelpedhermotherdeliver运送foodtothepoorandsick.1Herfamilywasshockedbecausenursingwasnotarespectedprofession职业. ButFlorencewasdetermined.Shestudiedbooksonmedicine.LatershevisitedhospitalsinFranceGermanyandIrelandandlearnedeverythingshecould.2 In1854BritainwasatwarwithRussiaFlorencewenttotheBritishhospitalinScutariandshewasshocked.Thehospitalleftmenlyingonthefloorandratswererunningeverywhere.3Manysoldiersdiedbeforereceivinghelp. Thedoctorswouldn'tlistentoFlorencebecausetheydidn'tliketheideaofwomeninarmyhospitals﹣untiloneday500unexpectedcasualties伤亡者arrived.4Florencemadechangesmakingsurethemenwerewashedandtheirinjurieswerecaredfor.Everynightshewouldcheckthepatientswithherlamp. Whenshereturnedhomeafterthewarafundhadbeensetupinherhonor.Manyofthesoldiersshehadnursedhadmadecontributions捐款.NowshecouldsetuptheNightingaleTrainingSchoolinLondon. AfteryearsofhardworkFlorenceNightingalesawcleanerandmorecheerfulhospitals.5Allofthiswasbecauseoftheladywiththelamp. A.Nursingbecameanhonoredprofession. B.Therewasnorunningwaterandnoheat. C.Sheknewshehadmuchtolearnaboutnursing. D.Florencesawthesoldiers'healthhadimproved. E.Asshegrewoldershedecidedtobecomeanurse. F.TheysoonrealizedthatFlorencecouldgiveahand. G.Uponreturninghomeshewasanexpertonhospitalmanagement.
如图直线y＝2x+6与反比例函数y＝𝑘＞0的图象交于点A1m与x轴交于点B平行于x轴的直线y＝n0＜n＜6交反比例函数的图象于点M交AB于点N连接BM． 1求m的值和反比例函数的表达式 2观察图象直接写出当x＞0时不等式2x+6＜0的解集 3当n为何值时△BMN的面积最大最大值是多少
如图在△ABC中点DE分别在ABAC上∠AED＝∠BAB＝2AE若△ADE的面积为2则四边形BCED的面积为．
当k＜0时一次函数y＝kx﹣k的图象不经过
Mekongfreshwaterirrawaddydolphin短吻海豚isanendangeredspecies濒危物种throughoutAsiawithreducingnumbersinhabiting栖息stretchesoftheMekonginCambodiaandLaosandBangladesh.Thedolphincanliveupto30yearsgrowupto2.5minlengthandcanweigh150kg. Fortunatelyfortravelersthedolphinshavebecomeapopulartouristattractioninrecentyearsprovidingavitaldevelopmenttothelocaleconomy.Kratieasleepyprovincialcapital7hoursbybusfromPhnomPenhisthebestplacetoseethem.TheirrawaddydolphinsliveindeepMekongpoolallyearroundandcanbefoundatKampivillage15kmnorthofKratietownwhichhasbecomeasymbolofthetown'srejuvenationafteryearsofwarandneglect.ThetriptoseethedolphincanbestartedatanytimeofthedayfromKraietownandtravelupstreamaround30minutesbycaralongaquietpavedroadtoKampiariversidefishingvillage. Thedolphinscanusuallybeseenrightfromtheriverbankbutit'sworthwhile值得的totakeaspottingcruiseinoneofthewoodenlong﹣tailboatsavailableforhire.Theirrawaddydolphinswon'tcomerightuptotheboatliketheirgregarious群居的salt﹣watercousinsbuttheyareeasytofindlyinglazilyaboutonthesurfaceorbreakingwaterwithadistinctivepuffofspraywhilechasingfish. Theboattripindriveseasonisonly60minutes.Theboatmenwillturnoffthemotortoapproachthedolphinsandsailwithwoodenoarsorsimplymakefasttoaclumpoffbrushwhendolphinsarenearby.Injustoveranhourontheboatyouwillseethedolphinsoverahundredtimesatarangecloseenoughtodistinguish辨别betweenindividualanimals. 1Whatisthemainideaofthefirstparagraph? A.Generalinformationofirrawaddydolph. B.Theprotectionofirrawaddydolphins. C.Thedistributionofirrawaddydolphins. D.Thegrowthofirrawaddydolphins. 2TheunderlinedwordrejuvenationinParagraph2probablymeans. A.destruction B.reunion C.recovery D.reform 3Whichofthefollowingisthecorrectroutetoseeirrawaddydolphins? A.Kampi→PhnomPenh→Kratie B.PhnomPenh→Kampi→Kratie C.Kratie→phnomPenh→Kampi D.PhnomPenh→Kratie→Kampi 4Whatcanwelearnfromthelastparagraph? A.Irrawaddydolphinscanbewatchedclosely. B.Irrawaddydolphinsarenotafraidofpeople. C.Irrawaddydolphinsliketocomerightuptotheboat. D.Irrawaddydolphinsdon'tliveingroups.
如图在平面直角坐标系中△ABC的顶点A在第一象限点BC的坐标分别为2161∠BAC＝90°AB＝AC直线AB交y轴于点P若△ABC与△A′B′C′关于点P成中心对称则点A′的坐标为
InthewatersoffBrisbaneAustraliaasevenfootlongsandtigersharkswimsinpain.Atwofootlongspikesticksoutofherside.It'sapieceoffishingequipmentthatthesharkatecarelessly.Aftertravelingintoherbodythespikepunctured刺throughtheshark'sstomach. Amanswimminginthewaternoticestheshark.ThenhewarnsSeaWorldMarineParkinthenearbytownofGoldCoast.SeaWorldsendsa12personteamfromitsrescuecentertowherethesharkwasdiscoveredinMoretonBayMarinePark.Soontheyfindherlyingontheseafloor.She'lldiewithouthelpsaysTrevorLongleaderoftherescuecenter. Usinganonboardcrane吊车therescuersmovethesharkintotheirboat's13footlongtank缸.ThenDr.DavidBlydegivesthesharkpainmedicineandperformsanoperationtoremovethespike.AfterthattheteamsailswiththesharktoSeaWorld33milesaway.Theyplacethefishina49footlongtankandwaittoseeifshegetsbetter. Togivetheshark'sstomachtimetogetbettersheisn'tfedforthefirstfewdays.AweekafterheroperationLongoffersthesharkasmalldeadfish.Theanimalrefusestoeat.Butdayslaterwhenhedropsanotherfishintohertankthesharkenjoyshermeal.Bynowtheshark'swoundsaregettingbetter. TwoweeksafterherrescuetheytakethesharkbacktotheboatandreturnhertoMoretonBayMarinePark.Asthefishisloweredbythecranetothewater'ssurfacetworescuersjumpintotheoceanandguideherintothesea.FromtheboatLongwatchesherswimaway.ThesharkhasanotherchanceLongsays. 1Whathappenstothesandtigershark? A.Sheisunluckyandgetshurtbadly. B.Shehasnothingtoeatforafewdays. C.SheswimsinSeaWorldandlosesherway. D.Sheisseriouslyillbecauseofseawater. 2AccordingtothetextSeaWorld. A.helpsprotectandsaveanimals B.is33milesawayfromGoldCoast C.hasn'tenoughspaceforanothershark D.hasneverperformedoperationsonsharks 3HowdoesLongfeelwhenfeedingthesharkforthefirsttimeaftertheoperation? A.Veryproud. B.Quiteworried. C.Reallyrelaxed. D.Extremelyafraid. 4Whatwouldbethebesttitleforthetext? A.Dangersfromsharks B.Sandtigersharkrescue C.MoretonBayMarinePark D.ArescueteamfromSeaWorld
TheIsleofSkyeisagreatdestinationforwildlifewatchers.Listedbelowaresomeofthebirdstobeseenwhilevisitingtheisland.Ifyouarekeentoseeasmuchaspossibleduringyourstayitwouldbeworthjoiningawildlifetour. SeaEagle Thewhite﹣tailedeaglecommonlyknownastheSeaEagleisthelargestbirdofpreyinBritainandisonlyfoundonthewestcoastofScotland. Theadultseaeaglehasawingspanof8﹣footandeatsfishrabbitsandothersmallbirds.Thebirdsdiedoutbecausetheywerecaughtandkilledbyfarmers.In1975theSeaEaglewerereintroducedtotheIsleofRumfromNorway.SincethentherareEagleshavegonefromstrengthtostrengthnowwithhundredsofbirdsaroundwestcoastofScotland. Gannet ThegannetisthelargestseabirdinScotlandwithanadultbirdhavingaswingspanofupto6﹣foot.Gannetsarefamousforthewaytheycatchfish.Whentheyspotaschooloffishfromtheairtheyfoldtheirwingsbackanddiveintothewaterathighspeed.Thisisdramatictowatch. Puffin Thepuffinisasmallseabirdthatismadefamousbyitsparrot﹣likemouth.Theyareadivingbirdandanimpressiveswimmerwhenhuntingfish. GoldenEagle Agoldeneagleisnearthetopofanybirdwatcherslist.TheIsleofSkyeisagreatplacetoseetheminthewild.Withaswingspanofupto8﹣foottheyareoneofthelargestbirdsofpreyinBritain.Theirdietincludesmicerabbitsandfishandannoyinglyforthelocalfarmersastheyhavebeenknowntotakewholelambs! 1Howdowildlifewatchersfeelwhenwatchingthegannetcatchfish? A.Verycurious. B.Veryfrightened. C.Veryexcited. D.Veryannoyed. 2Whosedietdothelocalfarmershate? A.Aseaeagle's. B.Agannet's. C.Apuffin's. D.Agoldeneagle's. 3Whatdothefourbirdshaveincommon? A.Theyareallrarebirds. B.Theyalleatfish. C.Theyarealldivingbirds. D.Theyallhavelargeswingspans.
JohnMichaelThomas14Florida WhenJohnMichaelThomasdecidedtohonorhisfriendandclassmateElizabethBuckleywhodiedfromcancerherememberedhowmuchshelovedpeacocks孔雀. Hewantedtobuildalifesizedpeacockfountain喷泉inElizabeth'sfavoriteparkinthecity.Hethoughtitcouldbeaplaceforpeopletorelaxandbeinspired. JohnMichaelraised﹩52000tobuildthefountain. BarrettEngland13Utah ThewheelsbegantoturnforBarrettEnglandwhenheheardaboutKarmaBikeShopaplacewhereyoungpeoplecanearnafreebikebyreadingandperformingcommunity社区service. BarrettvisitedKarma'sownerwithhisideaHewouldcollectandrepairusedbikesanddonate捐赠themtotheshop. Heexpectedtogetabout10donatedbikes.IntheendBarrettreceived39. ZacharyBlohm15Wisconsin The25yearoldplaygroundatanelementaryschoolnearMilwaukeeWis.wassosmallthatonly70ofits575studentscouldplayonitatatime. That'swhenZacharyBlohmsavedthedayHeandsomevolunteersbuiltahugeplayground.ToraisemoneyZacplannedTshirtandbakesalessoldticketsandmore.Heheldmonthlymoneyraisingeventsformorethanayear.Overallhecollected﹩130000﹣enoughtofinishhisproject. JackZimmerman16NewJersey Forsomepeoplefindingamealisassimpleasopeningtherefrigerator.Formorethan366000hungrykidsinNewJerseyit'snotthateasy. Thatfactdidn'tsitwellwithJackZimmermanwhoorganizedadrivetolessenchildhoodhungerinhisstate.Hisgoalcreate40000packagedmealsthatcouldbedonatedtothoseinneed.OngamedayJackandhisvolunteersstartedtheirwork.Afterthefinalcounttheteamhadpackaged47124meals﹣wellaboveJack'sgoal. 1Thepeacockfountainwasbuiltinapark. A.toinspirepeople B.fortheloveofanimals C.inmemoryofateenager D.toencourageacancersufferer 2WhatdidBarrettdoforKarmaBikeShop? A.Hedonatedbikestoit. B.Herepairedbikesthere. C.Hehelpeditwincustomers. D.Heofferedareadingservicethere. 3Whatdothefourpeoplehaveincommon? A.They'retopstudents. B.Theycareaboutothers. C.Theylikevariouspublicactivities. D.They'remoneyraisersforthepoor.
如图▱ABCD的对角线ACBD相交于点OE是AB中点且AE+EO＝4则▱ABCD的周长为
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的等差数列 公差为4 的等差数列 不是等差数列
的等比数列 首项为2、公比为2的等比数列 既非等差数列也非等比数列 首项为2、公差为
的等差数列 首项为2、公差为2的等差数列
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