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如图所示,薄木板A、B静止在水平地面上,小物块C(可看成质点)位于木板B的左端.现用水平恒力F推木板A,使其由静止向右运动,A、B碰后粘在一起,C滑到A上.已知木板A长L=4m,A、B相距s=6m,...
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高三下学期物理《》真题及答案
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如图所示质量为M.的木板静止放置在粗糙水平地面上有一个可视为质点的小物块质量为m以某一水平初速度从左
如图所示半径R.=0.8m的光滑圆弧轨道固定在水平地面上O.为该圆弧的圆心轨道上方的A.处有一个可视
如图所示一质量为M=10kg长为L=2m的木板放在水平地面上已知木板与地面间的动摩擦因数为m1=0.
如图所示一长木板放置在水平地面上一根轻弹簧右端固定在长木板上左端连接一个质量为m的小物块小物块可以在
整个过程中小物块的速度可以达到
整个过程中木板在地面上运动的路程为
长木板静止后,木板所受的静摩擦力的大小不变
若将长木板改放在光滑地面上,重复上述操作,则运动过程中物块和木板的速度方向可能相同
如图所示物块质量m=0.5kg可看作质点它与木板之间动摩擦因数μ1=0.5.长L=3m质量M=2kg
如图所示重为100N.的物块静止在水平地面上现用50N.的水平推力向右推物块画出物块所受重力G.和推
如图所示光滑的斜面体质量为M.倾角为长为质量为m小物块从斜面体顶端由静止开始下滑斜面位于光滑的水平地
如图所示放在水平地面上的物块受到一个与水平方向成θ角的力F的作用如果保持力F的大小不变而使力F与水平
N变大,f变大
N变大,f变小
N变小,f变小
N变小,f变大
一长木板在水平地面上运动在t=0时刻将一相对于地面静止的物块轻放到木板上以后木板运动的速度-时间图象
如图所示质量为M.=2kg的足够长的木板A.静止在水平地面上其上表面水平木板A.与地面间的动摩擦因数
如图10所示一质量为M.=10kg长为L.=2m的木板放在水平地面上已知木板与地面间的动摩擦因数为μ
如图所示物块P与木板Q叠放在水平地面上木板Q对物块P的支持力的反作用力是
物块P受到的重力
地面对木板Q的弹力
物块P对木板Q的压力
地球对木板Q的吸引力
2016·西安市模拟如图9甲所示一长木板静止在水平地面上在t=0时刻一小物块以一定速度从左端滑上长木
如图所示静止在水平地面上的平板车质量M.=10kg其上表面离水平地面的高度h=1.25m.在离平板车
如图所示一长木板放置在水平地面上一根轻弹簧右端固定在长木板上左端连接一个质量为m的小物块小物块可以在
整个过程中小物块的速度可以达到
整个过程中木板在地面上运动的路程为
长木板静止后,木板所受的静摩擦力的大小不变
若将长木板改放在光滑地面上,重复上述操作,则运动过程中物块和木板的速度方向可能相同
如图所示质量为M=2kg的足够长的长木板静止放置在粗糙水平地面上有一质量为m=3kg可视为质点的物块
放在水平地面上的物块受到一个与水平方向成θ角斜向下方的力F.的作用物块在水平地面上始终静止如图所示如
N.变小,f变大
N.变大,f变小
N.变小,f变小
N.变大,f变大
如图所示厚0.2m长2m的木板AB静止在粗糙水平地面上C为其中点.木板上表面AC部分光滑CB部分粗糙
如图所示半径R.=0.8m的光滑圆弧轨道固定在水平地面上O.为该圆弧的圆心轨道上方的A.处有一个可视
如图所示粗糙水平地面上固定一半径为R.的四分之一光滑半圆轨道AB甲物块从其顶点A.静止释放进入水平部
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为做好达州市渠江航道升级的前期工作四川省交通运输厅交通勘察设计院组织专家到渠江现场踏勘现要测量渠江某处BA两岸的距离如图在B的正东方向选取一点C测得CB=2kmA位于C西偏北60°A位于B北偏东15°则BA的距离=
已知命题命题q若a<b则则下列为真命题的是
已知点Ab是函数fx=sinπ•x+φ+b0<φ<πb>0图象上一点点A到直线14x+3y=0的距离为1.1求函数fx的解析式2令S=f+f+f++f求S的值.
九连环是我国古老的一种智力游戏它环环相扣趣味无穷九连环由九个大小相同的圆环依次排开镶在铁丝框架上.玩九连环就是将九连环按照一定规则从框架上解下或套上.用Kn表示解下n个圆环所需移动的最少次数已知K1=1K2=2通过规则可知Kn=Kn﹣2+2n﹣11≤n≤9n∈N则K5=.
已知向量⊥||=1则|+|=
Peoplebecomeaddictedtomanythings.Someofthesemaybedrugsalcoholandsmokingbutalsoelectronics.Electronicsgetyouaddictednotbecauseofdrugslikenicotinebutbecauseofsomethingcalleddopamine多巴胺. Dopamineisachemicalnaturallyproducedinthebodythathelpscontrolthebrain'srewardandpleasurecenters.Itisreleasedwhenyouwinsomething.Younotonlygetdopaminefromwinningsportslikefootballortennisbutalsogetasmallamountofdopaminewhenyouhearanotificationfromyourdevicewinsomethinginavideogameorevensimplysurfthewebonyoursmartphone.Yourbodylovesthefeelofdopamineandtriestofindmorewaystogetitwithlesseffortwhichcanleadtoaddictiontoelectronics. Webecomeaddictedtovariouselectronics.Butamongallofthemphonesmaynotdotoomuchharmtousphysically.It'sdevicessuchastelevisionsandcomputersthatcauseyoutositfortoolongwithoutstretchingormovingwhichcanresultinaconditionknownasdeepveinthrombosis深静脉血栓.Itcancauseseriousdamagetoourhealth. Howeverwecantrytobreakawayfromaddiction.Wecanmakeaccesstoourdevicesalittlemoredifficultwhichcandiminishthechancesofusactuallywantingtogoanddothatspecificthing.Forexampleifyouknowyoufrequentlyuseanapponyoursmartphoneyoucanputtheappincertainfarcornerofyourphonethereforeitwouldtakeyoualittleextratimetogettoitinsteadofjustturningthephoneonandhavingdirectaccesstoit.Besideswecanpreventphysicalproblemsbyusingastandingdesk.Thisisbasicallyadeskbutyouhavetostandatitinsteadofsittingonit.Thiscanpreventawiderangeofphysicalproblemsincludingobesitylowerriskofheartdiseaseandsoon. Allinallelectronicsprobablyalreadyhaveyouaddicted.Thankfullytherearewaysyoucangetoutofthisaddiction.It'snotalostcauseandyoucanstillgetyourselfhealthyandoutofaddiction. 1Whenweplaywithelectronicsthedopamineproducedinthebody. A.isbadforourmentalhealth B.causesaddictiontoelectronics C.increasesthechanceofwinning D.isinchargeofourbrain'sactivities 2WecaninferfromParagraph3thatphones. A.areharmlesstoourphysicalhealth B.dogreatharmtoourmentalhealth C.arenomoreaddictivethanotherdevices D.don'tharmourbodyasmuchasotherdevices 3WhatdoestheunderlinedworddiminishinParagraph4mean? A.Reduce. B.Ruin. C.Access. D.Seize. 4WhatdoestheauthorintendtodoinParagraph4? A.Advertiseanewstandingdesk. B.Callonpeoplenottouseelectronics. C.Advisepeopletousetheirappswisely. D.Providewaysofgettingridofaddictiontoelectronics.
在△ABC中sinAsinBsinC成等差数列sinC﹣+sinC+=sin2C且=32则|AB|=
Awomanprofessorwalkedaroundinaclassroomwhileshewasteachingstressmanagementtoherstudents.1sheraisedaglassofwater2expectedtheywouldbeaskedthehalf﹣emptyorhalf﹣fullquestion. Insteadwitha3onherfacesheaskedWhat'sthe4ofthisglassofwater? 5calledoutrangedfromeighttotwentyounces盎司. She6thestudentsdownandthenrepliedTheabsoluteweightdoesn'tmatter.Itall7howlongIholdit.IfIholditforaminuteit'snotaproblem.IfIholditforanhourI'llhavea8inmyarm.IfIholditforadaymyarmwillfeelnumb麻木andparalyzed麻痹.Ineach9theweightoftheglassofwaterdoesn'tchangebutthelongerIholditthe10itbecomes.Doyouknowwhy? Allthestudentskeptsilentandlistenedcarefullylostinthought. She11Ourand12inlifearelikethatglassofwater.Thinkaboutthemforawhileandnothing13.Thinkaboutthemabitlongerandtheybegintohurt.Andifyouthinkaboutthemalldaylongyouwillfeel14unabletodoanything. It'simportantto15toletgoofyourstresses.Asearlyintheeveningaspossibleputallyourburdensdown.Don't16themthroughtheeveningandintothenightRemembertoputtheglassdown! Moreoftenthannotlifegets17whenwethinktoomuch.Andthemomentyou18yourburdenyou'llfindyourselffeelingsomuchmorerelaxed. So19wonderingaroundandfeelingsorryforyourselfstartdoingsomethingaboutit.Afteralllifeistooshorttodevoteyourselftoanythingthatmakesyou20. 1A.If B.As C.However D.Though 2A.everyone B.nobody C.someone D.anyone 3A.look B.puzzlement C.smile D.surprise 4A.quality B.weight C.amount D.problem 5A.solutions B.numbers C.methods D.answers 6A.quieted B.stopped C.signed D.signaled 7A.decidedon B.dependson C.resultedfrom D.resultedin 8A.cut B.problem C.danger D.pain 9A.glass B.way C.case D.manner 10A.moreserious B.more C.harder D.heavier 11A.continued B.explained C.commented D.replied 12A.worries B.anger C.discomfort D.problem 13A.matters B.helps C.happens D.works 14A.shocked B.dissatisfied C.angry D.discouraged 15A.come B.remember C.realize D.believe 16A.get B.carry C.put D.take 17A.exciting B.frightening C.terrible D.colorful 18A.undertake B.refuse C.remove D.change 19A.ratherthan B.morethan C.besides D.Asto 20A.relaxed B.unsure C.excited D.unhappy
Becominganeffectiveandefficientstudentisnotsomethingthathappensovernightbutputtingafewofthesetipsintodailypracticecanhelpyougetmoreoutofyourstudytime. Focusonlearninginmorethanoneway.Insteadofjustlisteningtoapodcastwhichinvolvesauditory听觉的learningfindawaytorepeattheinformationbothverbally口头地andvisually.Youcandescribewhatyoulearnedtoyourfriend.1. Teachwhatyou'velearnedtoanotherperson.Startbytranslatingtheinformationintoyourownwords.2.Someideasincludewritingablogpostcreatingapodcastorparticipatinginagroupdiscussion. Gainpracticalexperience.Ifyouaretryingtoacquireanewskillorabilityfocusongainingpracticalexperience.3.Ifyouarelearninganewlanguagepracticespeakingwithanotherpersonandsurroundyourselfwithlanguage﹣immersionexperiences. 4.Weknowlearningisn'taperfectprocess.Sometimesweforgetthedetailsofthingsthatwehavealreadylearned.Ifyoufindyourselfstrugglingtorecallsomeinformationresearchshowsthatyou'dbettersimplylookupthecorrectanswerbecausethatrecallingmayresultinlearningtheerrorstateinsteadofthecorrectresponse. Understandhowyoulearnbest.Anothergreatstrategyforimprovingyourlearningefficiencyistorecognizeyourlearninghabitsandstyles.5.Thenyourlearningefficiencycanbeimprovedgreatly. A.Recallingresultsinthewronganswer. B.Lookupanswersratherthanstruggletoremember C.Nextfindsomewaystosharewhatyou'velearned. D.Youcanapplyitbysharingyournewlylearnedskills. E.Ifitisasportofathleticskillperformtheactivityregularly. F.Thathelpsyougainabetterunderstandingofhowyoulearnbest. G.Intheprocessyoucanmaketheknowledgemorepermanentinyourmind.
过抛物线Cy2=4x的焦点F作互相垂直的弦ABCD则四边形ACBD面积的最小值为.
假定你是李华你看到悦读网Enjoyreading正在举行百日阅读汉语经典活动要求参加者在网上连续阅读一百天每天至少半小时完成后该网站免费赠送书籍.请给你的留学生朋友Henry写封邮件推荐该活动.内容包括 1.介绍该活动 2.推荐该活动 3.推荐理由至少两条. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
如图等腰梯形ABCD中AB∥CDAC与BD交于点O∠DAB=45°若AB=3CD=6则以下所有结论中正确的序号是. ①若=则μ=3λ ②三角形AOB的面积为4 ③== ④若MN是直线BC上的动点•=24
Lionstigersandotheranimalsarestayingawakeatnight1avoidhumanbeingsanewstudyfinds. Scientistshaveknown2humanactivitiescanleadtochangesinnature.Manyanimalsmaymovearoundlessortraveltofarplacestokeepaway3people.Byawakingatnightanimalscanalsobeonguardagainstpossibleenemiesandspendlesstime4lookforfood. Thelatestresearchfoundthatevenactivitieslikefarmingandcampingcan5frightanimalsandcausethemtobecomemoreactiveatnight.Researcherscompared6carefulhowmuchtimethoseanimalswereactiveatnightinareasofhumanactivitiessuchashuntingandfarming.7washumanactivitiesthatcausedanincreaseofabout20percentinnight﹣timeactivitiesevenincreaturesthatusuallysleepatnight.Results8publishinthejournalSCIENCEtwomonthsago. Thenewfindingsare9usualbecausenooneelsehaslookedatitinsuchdetailbefore.EcologistMarleeTuckerwas10surprisethatanykindofhumanactivitiesisenoughforanimalstoseepeopleasathreat.
某单位有7个连在一起的车位现有3辆不同型号的车需停放如果要求剩余的4个车位中恰好有3个连在一起则不同的停放方法的种数为
PracticalWaystoShowRespectforaFriend ●Showrespectfortheirlifechoicesanddecisions 1.Theywillmakedifferentlifechoiceshavedifferentviewsonpoliticsandreligionandactdifferentlyinmanyways.Thisdoesn'tmeantheycan'tbeyourfriend.Itmeansthatyou'llneedtotakeastepbackreservejudgmentandshowrespect. ●Givethemthebenefitofthedoubt Assumptions猜疑canbeadangerousthing.2.Berespectfulandgivethemthebenefitofthedoubtwhenyoudon'tdo.Thisalonewillhelpyoustayintheirgoodgraces好感. ●Givefriendsyourfullattention Oneofthebestwaystoshowrespectforsomeoneistolistentothemfully.Allowthemtopauseconveynonverbalcommunicationcluescollecttheirthoughtsandgetitallout.Toooftenfriendslistenwithhalfanearorjumpintheminutetheirfriendpauseswithanevenworsestory3.Whenyourfriendistalkingpayattention. ●4 Treatyourfriendsrespectfullywhenyouarguewiththem.Makeyourfriendshipasafeplacebynotembarrassingyourfriendorexpressingyourprivatedisagreementsinfrontofotherpeople.Bepubliclysupportiveandkindtoyourfriendssotheyknowyouvalueyourfriendshipwiththem. ●Showupbethereanddowhatyousayyou'regoingtodo 5.Sojustshowyourfriendthebestkindofrespectbybeingontimekeepingpromisesandbeingtheonefriendtheycanalwayscounton.That'sthewaytotrulyshowrespect. A.Acceptthatpeoplearen'talwaysgoingtobejustlikeyou. B.Noonelikesanunreliablefriendwhosaysthey'llbethereandthendoesn'tshow. C.Tellyourfriendswhatyouthinkaboutthemdirectly. D.Thistypeofbehaviorisverydisrespectful. E.Infactyoucandoeverythingbutacceptthedifferences. F.Ifyou'reindoubtaboutsomethingaskyourfriend. G.Consideryourfriendshipapreciousgift.
已知Sn是数列{an}前n项和点anSn+2n+1n∈N*在直线2x﹣y=0上令bn=cn=1. 1求a1的值 2求证数列{bn}是等差数列 3对任意的pq∈N*若λ≥|cp﹣cq|恒成立求实数λ的取值范围.
ToeducateagirlistoeducateathousandpeoplesaysMaimounaSamakéamotherofsixchildrenincludingfivegirls.Ifyouputoneseedinthegroundandraincomesitwillgrowtoproducemanyseeds. Samakéoneof2000residentslivesinasmallvillageSounkalainoneoftheworld'spoorestcountries.NowshehasachancetoseethiswishcometruethankstoBuildOnanAmericannon﹣profitorganizationthatisbuildingaschoolinhercommunity. For17yearsBuildOnhasbeensendingAmericanhighschoolstudentsoverseastocreateschoolsinplaceswhereliteracy文化andformaleducationareusuallyoutofreach.Theorganizationhasbuiltabout300schoolsinMaliMalawiNepalSenegalNicaraguaandHaiti.ItsgoalistogetyoungAmericansinmostlyurbanareastogetinvolvedineducation.Atthesametimeitcanbringliteracytochildrenandadultsinpoorvillagesinthedevelopingworld. Sounkala'scurrentschoolonlyhasabout70childrenmudfloorspoorlightingfewdesksandanabsenceofbooksmeanthattheschoolisnotthemostideallearningenvironment.ThereforetheycertainlycoulduseBuildOn'shelp. Samakéhasn'tbeentoschoolbutshewantsabetterfutureforherfivedaughtersincludingRamatou12andMariam10.WhenawomanattendsschoolshewillteachwhatshelearnstoherchildrensaidRamatouwhowantstobecomeadoctor.Shewillalsoknowhowtotakebettercareofherfamily. BuildOntriestobuildschoolsforgradesonetothree.Ifthingsgowelloverthosethreeyearstheyreturntohelpbuildanotherschoolforgradesfourtosixandthensetupeveningadultliteracyclasses. RamatouandMariamwillnotlearninsidethewallsofBuildOnschoolsincetheyarealreadyinthesixthgradebutSamakéhopesthattheywillbeabletoattendeveningclassestocontinuelearning. 1WhichofthefollowingaspectsofBuildOnisNOTmentionedinthetext? A.Itssourcesoffunding. B.Itshistory. C.Itsgoal. D.Itsapproach 2AccordingtothetextWhatkindofschoolisBuildOnmostlikelytohelp? A.inavillageinadevelopedcountry B.inanurbanareainadevelopingcountry C.inaruralareainadevelopingcountry D.inanearthquake﹣strickenareainadevelopedcountry 3WhatdoweknowaboutSamakéandherfamily? A.Mariamisinthesixthgrade. B.Samakéiswell﹣educated. C.Ramatouisadoctor. D.Samakéonlyhasdaughters. 4What'sthemainideaofthepassage? A.Awoman'sdreamofgoingtoschool. B.People'seducationconditionsinpoorareas C.BuildOn'sgreatcontributionstoeducationandlife. D.Anorganizationthathelpsbuildschoolsforpeopleinpoorareas
Drinkingwaterisoneofthefavorsyoucandotoyourbody.Ithassurprisinghealthbenefitssuchasmakingyou1energyandhappy.Thereisalonglistof2reasonwhywatershouldbeamustinyourdiet. Ifyouarelookingforaproductthathelpsyourecoverandbecomeyoungerwaterisagood3choose.Itcanhelpyourskinrecoverfasterafterbeinginjured.Hotwaterevenhelpsyourskinbecomesmooth. Wateris4keepsthefoodmovingdownthroughyourbody.Ifthereisnotenoughwaterinthebodyit'llbetoohardforthefood5passthroughthebody.Warmwaterhelpsbreakdownfoodfasterandcan6effectiverelieveyourskin.Accordingtoastudydrinkingtwocupsofwaterwillincrease7speedofdigesting8about30%.Thisincludeswarmwaterwhichincreasesyourbodytemperaturesothefoodcan9digestfaster. Hotwatercanalsoplayarolein10cleanyourskinsoinawayitisanaturalskincareproduct.Fewerharmfulbacteriaintheskinmeanasmallerriskofsufferingskindiseases.
Lookingforsomeplacesoutofthisworldtovisitonvacation?Herearefourcoolplacestovisit. KennedySpaceCenterVisitorComplex LocatedintheeastofOrlandoFloridait'sconsideredasthegreatestspaceadventureonEarth.Youcanmeetastronautseatspacefoodwatchmoviesaboutpastspacemissionsandifyou'reluckygettowatchanewlaunchdependingonthespaceprogram'sschedule.Remembertotakeenoughmoneyforadmissionandvarioussouvenirsintheworld'slargeststoredevotedtospacesouvenirsandNASAclothingandequipmentwhichmightcostafortune. AmericanMuseumofNaturalHistory It'sanimportantscientificandculturalinstitutionwithextremelyimpressiveexhibitionsandcollectionsabouthumanculturesthenaturalworldandtheuniverse.Themuseumlookslikeahugeglassboxwithahugeglobeenclosedwhichisquiteattractivetopeople.ItcontainsspaceandastronomyexhibitsamodelsolarsystemandthebeautifulHaydenPlanetarium天文馆. NewMexicoMuseumofSpaceHistory NobodywouldexpectsuchacoolspacemuseuminthedesertnearWhiteSandsNewMexicobutinfactthereisone!Thismuseumrecordsthearea'sspacehistory.Admissionticketsareavailableonthewebsiteanditoffersdiscountsforseniorcitizensandyoungstersunderage12. LowellObservatory TheLowellObservatorylocatedonMarsHilloverlookingFlagstaffwasbuiltinthelate1800sbyMassachusettsastronomyenthusiastPercivalLowelltohelphimstudyMars.VisitorstoLowellObservatorycanseethedomevisitClydeTombaugh'stombtaketoursandparticipateinastronomycamps.Theobservatoryisatanaltitudeofabout7200feetsobringsunscreendrinklotsofwaterandtakefrequentbreaks. 1WhatwillyouprobablyfaceinKennedySpaceCenterVisitorComplex? A.Riskysurrounding. B.Adventurousastronomycamps. C.Terriblespacefood. D.Relativelyhighconsumption. 2WhatisspecialaboutNewMexicoMuseumofSpaceHistory? A.Itssize. B.Itshistory. C.Itslocation. D.Itsbudget. 3Wherearevisitorsadvisedtohavemorerest? A.InKennedySpaceCenterVisitorComplex. B.InAmericanMuseumofNaturalHistory. C.InNewMexicoMuseumofSpaceHistory. D.InLowellObservatory.
ItseemsasifChristmasandtheirbirthdayaren'tenough.Kidshaveanotherdaywhichrevolves围绕aroundthem.TherearealotoffunnyactivitiesinShanghaiespeciallyforfamiliesasChildren'sDayfallson1stJune. IndooractivitiesatBigE BigEisagreatplaceforkids.Allkindsofballgamescanbefoundhere.ThisSundaytherearesomeotherinterestingactivitiesfreemoviesandamagicshowwiththreesessions场between9amand6pm. TheWizardofOzatKerryHotel IfeatingandrelaxingiswhatyourfamilyareinterestedinKerryHotelshouldbeyourfavouriteplace.TheCOOKandTheMEATbothofferexcellentbrunch早午餐everyweekend.BesidesTheBREWwillorganizeTheWizardofOzforchildreninarepeatofitsspecialEasterperformance. BrunchatCityBistro Ifyou'relookingforarestaurantwithamorerelaxingatmosphereandlowerpricethaneitherTheCOOKorTheMEATthengotoCityBistro.AspecialdiscountonitsbrunchthisSundayhasneverhappenedbefore.Whileparentsareenjoyingthefoodtheirchildrencanplayinthekids'cornerandletparentscatchtheirbreath. Children'sexhibitionatGalleryG1 IfgoingoutforbrunchistooregularfamiliescantrysomethingalittlemoreculturalatGalleryG1.Thereisanexhibitionofchildren'sartworknamedMySkywhichwillbedisplayedthisweekend.Therearealsoanumberofartistic艺术的activitiesforkidstotry. GetcreativeatPetitChameleon PetitChameleonattheDaycarecentreisorganizinganewactivitynamedArtfromtheStarttoshowkids'creativeability.TheeventisaboutancientGreece.OnSundayyouwillseekidsmaketheirownarmors盔甲. 1TheCOOKandTheMEATare. A.funnyactivities B.activitycenters C.greatperformers D.famousrestaurants 2HowdoesCityBistroattractpeople? A.Byprovidingfreeperformance. B.Byofferingkidsmanyfreetoys. C.Byservingbrunchatalowerprice. D.Byhelpingtakecareofkidsforpeople. 3WhereshouldchildrenwholovesportsgoonChildren'sDay? A.BigE. B.KerryHotel. C.CityBistro. D.GalleryG1.
Foodisnecessaryforofferingenergytoourbodiesbutsometimeswebuytoomuchofitatthestore.Whenyourfoodstartstogobadtherearemanyotherwaysyoucanstillmakeuseofitinsteadofthrowingitaway. Beforethrowingawayoldbananasyoucanusethepeels皮toshineupmetalsandleathers.Pressthepeelagainstthesurfacemoveitbackwardsandforwardsandthenpolishcleanitwithanoldcloth.Bananameatisalsogoodforreducingwrinkles.Putabitonthosetroublespotsletitsitforawhileandthenwashitoffandyourwrinkleswillgoaway.Lemonsaregreatforlighteningskinandhair.Ifyouhavetroublewithsomeskindiseaseslikeredspotsonyourfaceputabitoffreshlemonjuiceonthemandleaveitovernight.You'llnoticeadifferenceinthemorning.Appleswillhelpripen使成熟tomatoesquicklywhentheyareplacedtogetherinapaperbagandorangepeelsaregreatfirestartersforyournextbackyardcampfireparty. Ifyourdogorcatbringshomefleasusingsaltisagreatwaytogetridofthemaroundthehouse.Justpoursaltintothevacuumcleaner真空吸尘器.Letitsitthenvacuumupthefleas.Thesaltcankillthefleas.Besuretothrowawaythevacuumbagoremptythevacuumbinimmediatelyorsomeofthefleascanclimbout. Beerisagreathairlightener.Ifyouareoutoflemonstrydippingyourhairinbeerbeforegoingoutside.Justdon'tforgettowashitoutafterwards.Milkisgreatforremovingdirtymarksespeciallyifitissometypeofink. Asyoucanseetherearemanyotherusesforeverydayfoodsaroundthehouse.Sonexttimebeforethrowingfoodawaythinkingitisofnousestopforamomentandthinkaboutalltheirusestalkedabouthere. 1Howmanywayswemakeusefruitaretalkedaboutinthepassage? A.3 B.4 C.5 D.6 2WhichoftheAllowingcanbeusedtolightenyourhair? A.Lemonsandbeer. B.Bananasandlemon. C.Orangesandbeer D.Milkandlemon. 3WhatdoestheunderlinedwordtheyinParagraphsreferto? A.Apples B.Tomatoes C.Applestomatoesandapaperbag D.Applesandtomatoes. 4What'sthewriterattitudetosurprisinguseofeverydayfood? A.Negative B.Positive C.Concerned D.Careful
已知实数xyz则下列命题正确的是
Myelephantadventuresbeganin1984whenwithourone﹣year﹣olddaughtermyhusbandandIcrossedthejungleinajeepslickingbehindalorryforcomfortandcompany.Theelephantsstandinglikewatchersoneithersideoftheforesthighwayhadusprayingforoursafety.Oneelephantmadeloudnoiseandangrilypawed抓thegroundwarningusoff.Weracedawaybeforetheycouldattack. Itwaswisetokeepelephantsatadistance.Weheardstoriesoftouristswhosejeepswereoverturnedandacoupleofphotographerswerekilledbecausetheymovedtooclose.Elephantsaremisleadinganimals.Theygivepeopleanimpressionofbeingquietandkindsotouriststhinkit'ssafetopicnicinthejungle丛林.Yetangryelephantshaveknockedthemdowninsecondsbeforetheycouldtakeoff. Elephantsmightmakelifeunpredictableanddangerous.It'sdifficultforinexperiencedenvironmentaliststoevenbegintograspthisreality.I'veheardcitypeoplesayWehumansareencroaching侵害ontheirforests.Butwhat'sthesolution? Whenapoorfarmerborrowsheavilytoplantacrophe'lldoanythingtoprotectitHislifedependsonitElephantsruininganabout﹣to﹣be﹣harvestedcomfieldcannotexpecttobewelcomedlikespecialguests.Thebattlebetweenbeastandfarmerisviolent. Expertsareworkingonsolutionstohuman﹣elephantconflicts冲突.Somearesuretofailtoliketheplanstobuildelectricfencesaroundhumansettlements.Elephantsrapidlyfigurethemoutandcomeinaroundandoverthem. Therearemorequestionsthananswersforsure.ButasmyhusbandsaidMorepeopledieincaraccidentseverysingledayineverycityontheearth.Buttheywon'ttakecarsofftheroadswillthey?Soweneedtoseekpracticalwaysofpreventingelephantaccidents. 1Whatisthewriter'spurposeinwritingParagraph1? A.Totellreadersherfamily'sexperienceofelephantadventure. B.Toshowreaderselephantsareangryanddangerous C.Tointroducethetopicofthewholepassage. D.Todescribehowherfamilykeepawayfromelephants. 2Whydotouriststhinkitissafetopicnicinthejungle? A.Theythinkelephantsarequietandkind. B.Theyhaven'theardthestoriesofelephantkillingpeople. C.Theylikeelephantstoomuch. D.Theythinktheycanraceawayinseconds. 3Whatdocsapoorfarmerdotoprotecthiscrop? A.Welcomeelephantlikespecialguests. B.Fightwithelephantsforhisharvest. C.Stopplantingcrops. D.Dependonelephantsforhislife. 4Whatcanwelearnfromthelasttwoparagraphs? A.Itisagoodideatobuildelectricfencesaroundhumansettlements. B.Itisimpossibletofindasolutiontosettlehuman﹣elephantconflict. C.Weshouldfirstreducecaraccidentstopreventelephantaccidents. D.Itisourdulytoprotectelephantsratherthankillthem.
已知定义在R上的函数gx其导函数为g'x若gx=g﹣x+x3+x且当x≥0时g'x<则不等式2gx﹣2gx﹣1>3x2﹣3x+2的解集为
ABC是平面内的三点已知A﹣21B23AC的中点M在y轴上BC的中点N在x轴上. 1求点C的坐标 2求过点M且垂直MN的直线l的方程一般式方程.
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. Ihavereceivedandreadyourletterinwhichyoumentionthatyouwantedtoloseweightbydiet. Itisonlynaturallythatyounggirlsatyouragehopetolookbeautiful.Howeverinmyopinionhealthyismoreimportantthanbeauty.Forastudentstudyingisthefirstthingtoconsiderwhileappearanceissecond.Sodonotletothers'opinionstoaffectyournormallife.Thereforeifyoudowanttoloseweightitisagoodideatodoitbygettingmoreexerciseandchangingunhealthyeatinghabits.Themostimportantthingishowyoukeepahealthystateofmindasitwillhelpwithourstudiesandwillalsohelpyouovercomedifficultiesindieting. IhopemyadviceswillbehelpfultoyouandI'mlookingforwardtoyournextletter.
已知直线4x+m2y﹣m=0m>0若此直线在x轴y轴的截距的和取得最小时则直线的方程为
直线l1y=x+1中若l1l2关于x轴对称则l2的倾斜角
近年来国资委党委高度重视扶贫开发工作坚决贯彻落实中央扶贫工作重大决策部署在各个贫困县全力推进定点扶贫各项工作取得了积极成效某贫困县为了响应国家精准扶贫的号召特地承包了一块土地已知土地的使用面积以及相应的管理时间的关系如表所示 并调查了某村300名村民参与管理的意愿得到的部分数据如下表所示 1求出相关系数r的大小并判断管理时间y与土地使用面积x是否线性相关 2是否有99.9%的把握认为村民的性别与参与管理的意愿具有相关性 3若以该村的村民的性别与参与管理意愿的情况估计贫困县的情况则从该贫困县中任取3人记取到不愿意参与管理的男性村民的人数为x求x的分布列及数学期望. 参考公式 其中n=a+b+c+d .临界值表 参考数据≈25.2
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括 1.举办艺术节的目的 2.介绍你最喜欢的一个艺术节活动 3.邀请Peter参加并告之艺术节活动的时间. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
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