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过点(0,1)且与直线x﹣2y+1=0垂直的直线方程是( )
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直线l过点01且倾斜角为450则直线l的方程是
x+y+1=0
x﹣y+1=0
x﹣y﹣1=0
x+y﹣1=0
直线l过点-12且与直线2x-3y+4=0垂直则l的方程是.
3x+2y-1=0
3x+2y+7=0
2x-3y+5=0
2x-3y+8=0
过点-13且垂直于直线x-2y+3=0的直线方程为
2x+y-1=0
2x+y-5=0
x+2y-5=0
x-2y+7=0
求过两条直线x-2y+4=0和x+y-2=0的交点P.且满足下列条件的直线方程.1过点Q2-12与直
过点-13且垂直于直线x-2y+3=0的直线方程为.
过点P-13且垂直于直线x-2y+3=0的直线方程为
2x+y-1=0
2x+y-5=0
x+2y-5=0
x-2y+7=0
已知直线l13x+4y﹣2=0和l22x﹣5y+14=0的相交于点P..求1过点P.且平行于直线2x
过点﹣23且与直线x﹣2y+1=0垂直的直线的方程为
过点01且与曲线y=在点32处的切线垂直的直线的方程为
2x-y+1=0
2x+y-1=0
x+2y-2=0
x-2y+2=0
根据下列条件分别求直线方程.已知直线l2m+1x+m+1y-7m-4=0m∈R恒过定点A.求过点A.
求满足下列条件的直线方程.1过点-12且与直线x+y-2=0平行的直线2过直线l12x+y-1=0和
过点01且与曲线在点32处的切线垂直的直线的方程是
x-2y+2=0
2x+y-1=0
2x-y+1=0
x+2y-2=0
过点﹣12且与直线2x﹣3y+4=0垂直的直线方程为
3x+2y﹣1=0
3x+2y+7=0
2x﹣3y+5=0
2x﹣3y+8=0
直线l过点P.01且与直线x﹣y+5=0垂直则直线l的方程是
x﹣y+1=0
x+y﹣1=0
x﹣y﹣1=0
x+y+1=0
过点
(1,2)且垂直于直线2x+y﹣5=0的直线方程为( ) A.x﹣2y+4=0
2x+y﹣7=0
x﹣2y+3=0
x﹣2y+5=0
过点01且与曲线y=在点32处的切线垂直的直线的方程为
2x﹣y+1=0
2x+y﹣1=0
x+2y﹣2=0
x﹣2y+2=0
已知点A.22和直线l3x+4y-20=0.1求过点A.且和直线l平行的直线方程2求过点A.且和直线
若直线l过点-12且与直线2x-3y+4=0垂直则直线l的方程为.
直线l过定点P.01且与直线l1x-3y+10=0l22x+y-8=0分别交于A.B.两点.若线段A
求过点A.23且垂直于直线3x+2y﹣1=0的直线方程
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如图所示可在竖直平面内转动的平台上固定着一个内壁光滑的气缸气缸内有一导热活塞活塞底面与气缸底面平行一定量的气体做密封在气缸内.当平台倾角为37°时气缸内气体体积为V然后将平台顺时针缓慢转动直至水平该过程中可以认为气缸中气体温度与环境温度相同始终为T0平台转至水平时气缸内气体压强为大气压强p0的2倍.已知sin37°=0.6cos37°=0.8. i当平合处于水平位置时求气缸内气体的体积 i若平台转至水平后经过一段时间环境温度缓慢降至0.9T.大气压强p0保持不变该过程中气缸内气体放出0.38P0V的热量求该过程中气体内能的变化量△U.
BecauselikemostofyouIbegancollegeinmyteensbutthesecondyearIwasofferedmydreamjobatUniversalStudiossoIdroppedout. WellIleftcollegebecauseIknewexactlywhatIwantedtodoandsomeofyouknowtoo﹣butsomeofyoudon't.Ormaybeyouthoughtyouknewbutarenowquestioningthatchoice.Maybeyou'resittingtheretryingtofigureouthowtotellyourparentsthatyouwanttobeadoctorandnotacomedywriter. Itoldmyparentsifmymoviecareerdidn'tgowellI'dre﹣enroll.Itwentallright.ButeventuallyIreturnedforonebigreason. MostpeoplegotocollegeforaneducationandsomegofortheirparentsbutIwentformykids.I'mthefatherofsevenandIKeptinsistingontheimportanceofgoingtocollegebutIhadn'twalkedthewalk.SoinmyfiftiesIre﹣enrolledatCalState﹣LongBeachandIearnedmydegree. Wellwhatyouchoosetodonextiswhatwecallinthemoviesthe'character﹣definingmoment.' Lifeisonestronglongstringofcharacter﹣definingmoments.AndIwasluckythatat18IknewwhatIexactlywantedtodo.ButIdidn'tknowwhoIwas.HowcouldI?Andhowcouldanyofus?Becauseforthefirst25yearsofourliveswearetrainedtolistentovoicesthatarenotourown.Parentsandprofessorsfillourheadswithwisdomandinformationandthenemployersandmentors有经验的顾问taketheirplaceandexplainhowthisworldreallyworks. AndIwanttobeclearthatyourintuition直觉isdifferentfromyourconscience.Theyworktogetherbuthere'sthedistinctionYourconscienceshoutshere'swhatyoushoulddowhileyourintuitionwhispershere'swhatyoucoulddo.Listentothatvoicethattellsyouwhatyoucoulddo.Nothingwilldefineyourcharactermorethanthat. 29.Theauthorwenttocollegeinhisfiftiesinorderto. A.getaneducationaldegree B.goforhisparents C.givehidchildrenanexample D.earnagoodreputation 30.Accordingtotheauthor'sviewwhatshouldwemainlyfollowwhenwechooseourcareer? A.Ourparents'advice. B.Ourownintuition. C.Ourconscience. D.Ourteachers'advice 31.What'stherightorderoftheeventsinthespeech? ①Tookhisjob②Gotmarriedandhadchildren ③Graduatedfromcollege④Droppedoutofchildren A.④③①② B.④③②① C.④①②③ D.④②①③
Abusybraincanmeanahungrybody.Weoftenseekfoodafterfocusedmentalactivitylikepreparingforanexam.Researchersthinkthatheavyboutsofthinkingdrainenergyfromthebrainwhosecapacitytostorefuelisverylimited. Sothebrainsensingthatitmaysoonrequiremorecalories卡路里tokeepgoingapparentlystimulatesbodilyhungerandeventhoughtherehasbeenlittleinthewayofphysicalmovementbodilyhungerandeventhoughtherehasbeenlittleinthewayofphysicalmovementorcalorieconsumptionweeat.Thisprocessmaypartlyaccountfortheweightgainsocommonlyseenincollegestudents. ScientistsattheUniversityofAlabamaatBirminghamandanotherinstitutionrecentlyexperimentedwithexercisetocountersuchimmoderatelypost﹣﹣studyfoodconsumption. GaryHunteranexercisephysiologistatU.A.B.oversawthestudy.Hunternotesthattoughactivitybothincreasestheamountofbloodsugarandlactate乳酸盐﹣circulatinginthebloodandincreasesbloodflowtothehead.Becausethebrainusessugarandlactateasfuelresearcherswonderediftheincreasedflowoffuel﹣richbloodduringexercisecouldfeedanexhaustedbrainandreducetheurgetoovereat. Thirty﹣﹣eighthealthycollegestudentswereinvitedtoU.A.B.'sexerciselabtoreportwhattheirfavoritepizzawas.Atalaterdatethevolunteersreturnedandspent20minutesdealingwithselectionsfromcollegeandgraduate﹣﹣schoolentranceexams.Nexthalfthestudentssatquietlyfor15minutesbeforebeinggivenpizza.Therestofthevolunteersspentthose15minutesdoingintervalsonatreadmilltwominutesofhardrunningfollowedbyaboutoneminuteofwalkingrepeatedfivetimes.Huntersaysthatshouldstimulatethereleaseofsugarandlactateintothebloodstream.Thesestudentswerethenallowedtogorgeonpizzatoo.Butbyandlargetheydidnotovereat.Infactthenon﹣exercisershoweverconsumedabout100caloriesmore. Thestudyhaslimitationsofcourse.Weonlylookedatlunch.Huntersaystheresearchersdonotknowiftherunnersconsumedextracaloriesatdinner.TheyalsocannottellwhetherothertypesofexercisewouldhavethesameeffectasrunningalthoughHuntersaystheysuspectthatifanactivitycausessomeonetobreakintoasweatitshouldalsoincreasebloodsugarandlactatefeedingthebrainandweakeninghunger'scall. 63.Accordingtothepassagemaycausemanycollegestudentstoovereatandgainweight. A.alotofenergy﹣consumingmentalactivities B.numerousphysicalmovementsorcalorieburning C.failuretoresistthetemptationofdeliciousfood D.bodilyhungercausedbyphysicalgrowth 64.Theunderlinedwordcounterisclosestinmeaningto. A.stimulateB.maximizeC.balanceD.prevent 65.Whatcanbeinferredfromthepassage? A.Runningismorebeneficialthanwalking. B.Sweatinginexercisecanmakepeoplehungrier. C.Theamountofbloodsugarandlactatecanaffectpeople'sappetite. D.Whenthebrainfeelsexhaustedpeopletendtodoexerciseforrelaxation. 66.WhichofthefollowingstatementsisFALSE? A.Mentalactivitiescanmakepeoplefeelhungry. B.Physicalexercisecanmakepeoplerefreshedandstayhungry. C.Sugarandlactatecanhelpenergizeandrestorepeople'sbrain. D.It'suncertainwhattypesofexercisecaneffectivelyfeedthebrain.
Wecanhaveconflictswithourimportantpersonslikefriendsrelativesetc.Inaheated61argueweusuallyuserudewordstomadesurewegainanadvantage62theotherperson.Thenthewholesituationgoesbadly.Soweshouldmakesurethattherearenoruderemarksandthesituation63moveinapositivedirection. It'seasyforustothinkwe'rerightand64somethingisn'tworkingoutitmustbesomeoneelse'sfault. 65ifyouaimtosolveaconflictyoushouldshowsomerespectandallowtheotherpartytoexpress66they.UsingremarklikeIunderstandyourconcernonthiswouldmaketheotherfeelmoreappreciated. Sometimessomepeoplegettooexcitedandmanybehaveinthewrongway.Thiscancausea67badsituation.Actuallytheyshouldcontroltheiremotionsandkeepcalm.Thishasto68learnthroughswlf﹣control. Thetipsmentionedaboveareusefulformostsituations.Howeverwedon'truleoutthepossibilitythattherearesomepeople69alwayswanttocreatesomesortoftroubleforothers.70putinanefforttoresolveaconflictwiththemmayjustnotbeawiseidea.Thebestwaytodealwiththesepeopleistoforgetthem.
A.technologyB.contemporaryC.stretchedD.hiddenE.recognized F.discoveryG.updatedH.extensiveI.countlessJ.estimatedK.definition Mostofuslearnatprimaryschoolthattherearesevencontinentsbutthenextgenerationofkidsmaybeaddingonemoretothatlist. AccordingtoarecentpaperpublishedintheGeologicalSocietyofAmericanJournalbyagroupofresearchersZealandiaisanewcontinentthat's31beneaththeocean. Zealandiais32tobefivemillionsqkm.MostofthismassiveareaiscoveredbywaterbutitshighestmountainsalreadyhavetheirownnameNewZealand. ThesmallcountryistheonlypartofZealandiathatisn'tunderwaterbutthepaper'sauthorswantthehugelandmasstobe33worldwideasitsowncontinent. ThescientificvalueofclassifyingZealandiaasacontinentismuchmorethanjustanextranameonalisttheresearcherswroteintheirpaper. ScientistsdiscoveredZealandiaallthewaybackin1995thenstarted34researchontheareausingunderwaterandsatellitemapping35.AftercompletingtheirworktheywerefinallyabletowriteareportsuggestingthatZealandiabenamedacontinent. Butwhodecidesonwhatisacontinentandwhatisn't?Thereisinfactnoofficialorganizationthatdoes.Somecountries'schoolsteachthattherearesixorevenfivecontinents.Thischangesdependingonwhereintheworldschoolis. Duetotheir36asacontinuousexpanseoflandsomeclassifyEuropeandAsiaasthesamecontinent﹣﹣knownasEurasia.SchoolsinRussiaandpartsofEasternEuropeteachthis. AndtomakethingsevenmoreconfusingFranceandGreeceaswellasothercountriesclassifyNorthAmericaandSouthAmericaassimplyAmerica. Thisargumentoverhowlandisdefinedhaseven37intoouterspace.In2006theInternationalAstronomicalUnionIAUdecidedthatPlutowasnolongeraplanet76yearsafterits38in1930.Expertsarguedthatitnolongermettherequirementsneededtobecalledaplanetalongsidetheeightothersinoursolarsystem.Itwasthereforerenamedadwarfplanet矮行星meaningthat39booksmodelsandmuseumexhibitsallovertheworldhadtobe40. ButwilltheworldtakethesamenoticeofZealandia?Thebestwaytotellistokeepaneyeonourtextbooks.
Grandmaalwaysmadeyoufeelshehadbeenwaitingtoseeyouandaccompanyyoualldaybutnowthedaysweregone.Shewas41ofsufferingfromAlzheimer'sdiseasewhenIwasakid.Iwas42asallkidsaresoIdidn'tthink43aboutit. Inmyfamilymygrandmaistheglue44ustogether.Iremembergoingtomygrandparents'farmhouseeverymomentIcouldwhenIwasakidwhereIalwaysenjoyedher45.LittledidIknowthesewouldbethe46ofmychildhoodthatIwouldmissthemost. AsIgrewupI47mygrandmachanging.Atfirstitwas48littlethings.OnceagainIdidn'tthinkitwasserious.Icouldneverhaveguessed49itwouldprogresstransformingmygrandmaintosomeoneIcould50recognize. OnedaymyfatherandIwenttovisitmygrandparents.We51thetimetalkingforhours52.Thenwith53eyesstaringrightpastmemygrandmaaskedNowyou'regraduatingthisyeararen'tyou?IwasafreshmansoIwas54whyshewasaskingmeaboutgraduation. Ittookmyfatherlongto55aresponseYes.Shemaynotknowwheresheisbutshewillbetherenomatterwhathappens.Iheardthe56inhisvoice. 57atsixteenIhaveabetterunderstandingofAlzheimer'sdisease.Itgreatly58metoknowthatonedayGrandmawill59beabletolookatmeandsayThatismygranddaughter.Sodon'tforgetallyour60outthere.Inotherwordsrememberthosewhocan't. 41.A.reformed B.thought C.informed D.reminded 42.A.thoughtful B.selfish C.foolish D.careful 43.A.second B.twice C.highly D.greatly 44.A.holding B.taking C.carrying D.pushing 45.A.happiness B.praise C.company D.comfort 46.A.thoughts B.stories C.feelings D.memories 47.A.accepted B.noticed C.met D.heard 48.A.just B.also C.already D.yet 49.A.what B.why C.how D.when 50.A.rarely B.seldom C.little D.hardly 51.A.wasted B.killed C.spent D.spared 52.A.occasionally B.regularly C.usually D.continuously 53.A.empty B.bright C.open D.wide 54.A.frustrated B.confused C.embarrassed D.discouraged 55.A.comeup B.putup C.comeupwith D.putupwith 56.A.relief B.happiness C.kindness D.sadness 57.A.Therefore B.However C.Thus D.Indeed 58.A.surprises B.excites C.encourages D.upsets 59.A.anylonger B.anymore C.nomore D.nolonger 60.A.elders B.ancestors C.relatives D.family
8分OnehotsummerIwastravelingdownthefreewayonadaytriptoLosAngeles.Duringmyjourneydownthehighwayanothermotoristsuddenlystartedcuttingintomylane.Beinginthefarrightlanemycarwasforcedontotheshoulderoftheroad.BeinganexperienceddriverIsteeredmycarbackontothehighwaythemotoristdroveawaywithoutsayinganything. WhileIwasn'tveryhappywiththepersonforcuttinginfrontofmeIdecidedtoconsideritanhonestmistake﹣alackofattentiontothelanechangeoradriverlostinthought.Itcertainlycouldnothavebeendoneonpurpose.Thecarspedawayaftercuttinginfrontmeandwassoonoutofsight. AfterawhileIcaughtupwiththesamemotoristonthesideoftheroad.Hewasanelderlygentlemanwhowaswalkingalongthesideofthefreewayonthishotday.WithhiscarstoppedonthesideoftheroadandthenearestservicesatleasttwentymilesawayIdecidedtostopandseewhattheproblemwas. Theman'scarhadaflattireandwhilehehadasparetirehedidn'thaveajack.Idecidedtohelphimandallowedhimtositinmyair﹣conditionedcarwhileIchangedhistire.FifteenminuteslaterIwashotsweatyanddirtybutIdidfeelgoodafterdoingsomethingforsomeone. 32.Whichofthefollowingwordcanbestdescribetheauthor? A.Bad﹣tempered.B.Humorous.C.Hard﹣working.D.Kind﹣hearted. 33.Wecaninferfromthesecondparagraphthatthe. A.motoristdidn'tpayanyattentiontothelanechange B.motoristwaslostinthoughtwhilehewasdriving C.motoristcutinfrontoftheauthoronpurpose D.authorforgavethemotorist 34.Whydidthemotoriststophiscaronthesideoftheroad?Because. A.hegotlostB.hiscarhadaflattire C.hewantedtohavearestD.hewantedtotravelwiththeauthor 35.Whatcanwelearnfromthetext? A.Actionsspeaklouderthanwords.B.Anactofkindnesscanmakeyoufeelgood. C.Nopainnogain.D.Itisnousecryingoverspiltmilk.
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WhenIwasinmythirdyearatuniversitymyroommateswereAmericanfootballerssoIdecidedtojointhem.Irememberseeingtheminfrontofmewearingpads防护垫andthinkingtheyweregoingtokillme.Igottackled阻截sohardthatIwasfrightened.ButthenIrealizeditwasjustphysicalcontact.I'vebeenaddictedsince. Thefundamentalaimofthegameistoscorebyrunningwiththeballintoorreceivingtheballinsidetheopposition'sendzone.Everyplayeronthefieldhasasetresponsibility.I'marunningback.MyjobisusingmyspeedstrengthandskilltocarrytheballandkeeprunninguntileitherIscoreorIgetputdown.Anditdoeshurt. I'vebrokentwofingersandhurtmyshoulderbuttheworstwaswhenItrappedtheligaments韧带inthebackofmyleg.Ihadtotakeayearout.Butnoneofthatputmeoff﹣allIcouldthinkwashowIwasgoingtocomebackstronger.BesidestrainingwiththeteamInowhavemygymroutinetogetfitterfasterandstronger. AlthoughpeoplethinkAmericanfootballisaggressivethere'smuchmoretoit.Everyteamhasitsownplaybookoutingeveryone'sroleindifferentscenes.Myplaybookwas73pageslong.Wordscan'tdescribehowitfeelswhenitallcomestogetheronthefield. Americanfootballhaschangedmylifeforthebetter.I'velearnedtimemanagementhowtotakeresponsibilityformyactionsandhowmuchItreasurebeingpartofateam.Withinthefourlinesofthefielditisphysical.Emotionsrunhigh.Ifyou'reontheopposingteamyouaremyenemy.Butoncethegameisdonewe'relikeabigfamily. 32.Theauthor'sbodypartswerehurtEXCEPT. A.hisarm B.hisshoulder C.hisleg D.hisfinger 33.Whatcanweinferfromthetext? A.Theauthorwasverydelightedwhenfirstplaying B.Theauthorhasbenefitedmorethansufferingfromthesport C.Theauthorbegantoplayatthebeginningofhisuniversitylife D.PlayingAmericanfootballisverypopularamonguniversitystudents 34.HowdoestheauthorfindhisplayingAmericanfootball? A.Relaxing B.Challenging C.Boring D.Rewarding 35.Thepassageismanlyabout. A.therulesofplayingAmericanfootball B.howpainfulitistoplaythesport C.howthesporthaschangedtheauthor'slife D.thereasonfortheauthorplayingAmericanfootball.
某型号多用电表欧姆档的电路原理图如图甲所示.微安表是欧姆表表头其满偏电流Ig=500μA内阻Rg=950Ω.电源电动势E=1.5V内阻r=1Ω.电阻箱R1和电阻箱R2的阻值调节范围均为0~9999Ω. 1甲图中的a端应与红或黑表笔连接. 2某同学将图甲中的ab端短接为使微安表满偏则应调节R1=Ω然后在ab端之间接入一电阻Rx后发现微安表半偏则接入的电阻阻值为Rx=Ω. 3如图乙所示该同学将微安表与电阻箱R2并联利用该电路图组装一个“×100倍率”的欧姆表要求欧姆表的表盘刻度示意图如图丙所示其中央刻度标“15”则该同学应调节R2=Ω用此欧姆表测量一个阻值约2000Ω的电阻测量前应调节R1=Ω.
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30分Asatemporaryteachermydailyroutine41drivingtoanewschool42everydaysoI'musuallyunabletoanticipate预料theday'seventsgoodorbad. OnoneparticulardayIwasteachinginavery43class.IwasmanagingbehaviorallthemorningandbylunchtimeIneededcoffeeto44theafternoon.Soatmylunch45Idrovetoanearbyplazatogetacupof46UponreturningtothecarIrealizedIhad47mykeysandmyphone48.Ihadabout15minutestogetbacktotheschoolwhichwasagood4﹣or﹣5minute49.Ithoughtofrushingbackbutitbeing50Ithoughtanastyfallonicewouldonlymakethesituationmuch51. SoIranintoaMcDonald'swhichwasinthe52plazaandaskedthemanatthecounterwho53tobethemanagertohelpmecallatab.I54explainedmysituationandhehurriedtothebacktousethephone55Ipacedintherestaurant. Themanagerreturned56totellmethatthecabcompanyhadputhimonholdandthenthelinegot57.Myexpressionbegantoresemblesomecombinationofhopelessnessandfear. Almostimmediatelythemanagergrabbedhiscoatand58todrivemetotheschool.Without59Ifollowedhimintohiscarandmadebackintomyclassroomwith2minutesto60beforethebell! 41.A.concludes B.involves C.relates D.connects 42.A.almost B.hardly C.really D.luckily 43.A.easy B.pleasant C.difficult D.noisy 44.A.cost B.pick C.finish D.survive 45.A.stop B.stay C.pause D.break 46.A.tea B.milk C.coffee D.wine 47.A.locked B.forgot C.threw D.shut 48.A.down B.inside C.up D.outside 49.A.distance B.drive C.walk D.time 50.A.summer B.fall C.winter D.spring 51.A.worse B.easier C.better D.simpler 52.A.other B.another C.next D.same 53.A.turned B.explained C.happened D.came 54.A.quickly B.briefly C.slowly D.hurriedly 55.A.after B.until C.when D.while 56.A.even B.only C.still D.yet 57.A.disconnected B.stuck C.troubled D.interrupted 58.A.dragged B.pulled C.offered D.pushed 59.A.problem B.choice C.alternative D.hesitation 60.A.spare B.leave C.ring D.control
1分﹣﹣Wouldyoulikesomecake? ﹣﹣I'vehadenough. A.Nothanks B.You'relucky C.It'suptoyou D.Icaneatit
如图a所示质量为M=1kg的木板静止在光滑水平面上质量为m=1kg的物块以初速度v0=2.0m/s滑上木板的左端物块与木板之间的动摩擦因数为μ=0.2在物块滑上木板的同时给木板施加一个水平向右的恒力F当恒力F取某一值时物块在木板上相对于木板滑动的路程为s给木板施加不同大小的恒力F得到﹣F的关系如图b所示当恒力F=0N时物块恰不会从木板的右端滑下.将物块视为质点最大静摩擦力等于滑动摩擦力重力加速度g取10m/s2试求 1求木板长度 2要使物块不从木板上滑下恒力F的范围 3图b中CD为直线求该段的﹣F的函数关系式.
8分We'vereachedastrange﹣somewouldsayunusual﹣point.WhilefightingworldhungercontinuestobethematterofvitalimportanceaccordingtoarecentreportfromtheWorldHealthOrganizationmorepeoplenowdiefrombeingoverweightorsayfrombeingextremelyfatthanfrombeingunderweight.It'sthegoodlifethat'smorelikelytokillusthesedays. Worsestillnearly18millionchildrenundertheageoffivearoundtheworldareestimatedtobeoverweight.What'sgoingon? Wereallydon'thavemanyexcusesforourweightproblems.Thedangersoftheproblemhavebeendrilledintousbypublic﹣healthcampaignssince2001andthemessageisgettingthrough﹣uptoapoint. Inthe1970sFinlandforexamplehadthehighestrateofheartdiseaseintheworldandbeingoverweightwasitsmaincause.Notanymore.Apublic﹣healthcampaignhasgreatlyreducedthenumberofheartdiseasedeathsby80percentoverthepastthreedecades. MaybethatexplainswhythepercentageofpeopleinFinlandtakingdietpillsdoubledbetween2001and2005anddoctorsevenoffersurgeryofremovingfatinsideandchangetheshapeofthebody.Thathasbecomeasortoffashion.Nowonderitranksastheworld'smostbody﹣consciouscountry. Weknowwhatweshouldbedoingtoloseweight﹣butactuallydoingitisanothermatter.Byfarthemostpopularexcuseisnottakingenoughexercise.Morethanhalfofusadmitwelackwillpower.Othersblamegoodfood.Theysayit'sjusttooinvitinganditmakesthemovereat.StillotherslaytheblameontheAmericanscomplainingthatpoundshavepiledonthankstoeatingtoomuchAmerican﹣stylefastfood. Somealsoblametheirparents﹣theirgenes.Butunfortunatelytheparentsarewrongedbecausethey'renormalinshapeorratherslim. It'sasimilarstoryaroundtheworldalthoughpeoplearerelativelyunlikelytohavetriedtoloseweight.Parentsareeagertoseetheirkidsshapeup.DoasIsay﹣notasIdo. 24.What'sthestrangepointmentionedinthefirstsentence? A.Thegoodlifeisagreaterriskthanthebadlife. B.Starvationistakingmorepeople'slivesintheworld. C.WHOreportshowspeople'sunawarenessoffoodsafety. D.OverweightissueremainsunresolveddespiteWHO'sefforts. 25.Whydoestheauthorthinkthatpeoplehavenoexcuseforbeingoverweight? A.Alotofeffectivedietpillsareavailable. B.Bodyimagehasnothingtodowithgoodfood. C.Theyhavebeenmadefullyawareofitsdangers. D.Therearetoomanyoverweightpeopleintheworld. 26.TheexampleofFinlandisusedtoillustrate. A.thecauseofheartdisease B.therearetoomanyoverweightpeopleintheworld C.theeffectivenessofacampaign D.thefashionofbodyshaping 27.Whichwouldbethebesttitleforthepassage? A.ActionsorExcusesB.OverweightorUnderweight C.WHOinaDilemmaD.NoLongerDyingofHunger.
Howdoyoupayforgoodsinashop?Perhapsyoulikethetruereliabilityofhardcash?Perhapsthefinancialflexibilityofacreditcardsuitsyoubetter? 36 Whateveryouuseourbodiesoureyesourfingerprintsevenourmerepresenceinthestore.37Amazonarehavingatrialonstoreswhichhavenocheckoutswheretechnologytrackstheitemsyou'vetakenfromtheshelvesanddeducts扣除thetotalfromyouraccountwhenyouleavetheshop. FrenchsupermarketMonoprixtakesadifferentpathyouchooseyourgroceriesandleavethemwithahumancashier.Youthenleavetheshopwhilethecashiersettlesyourbillchargesyouraccountandorganizesdeliverytoyourhome.38What'smorewearableitemssuchasringsbraceletsandkeychainswillcarrychipsthatallowshopperstorandomlyshopgoingbetweenthewebanapporinstore. 39Perhapssomethingtotallynewwilltakeoffthatchangesmoneyasweknow.OnesuchpossibilityisexploredinthemovieInTimewhichimaginesafuturesocietyinwhichmoneyistimeitselfwherepeopletradetheamountoftimetheyhavelefttolive.Orperhapswewouldgobacktothesimplerfinancialworldoftheoriginaleconomy.Inthiscaseweneedn'tusemoneywhiletrading.Itseemsasiftheimagesofsacksofgrainandherdsofsheepbeingexchangedinancienttimescamebacktolifewiththehelpofmoderntechnology.40Doyouthinkso? A.Alltheseshoppingmethodsareconvenientforcustomers. B.Buttheonlythingweknowforcertainisthatmoneywillkeepchanging. C.Whoknowswhatwillhappentomoneyinthefuture? D.Itiscertainthattradewilldisappearinthefuture. E.Orperhapsyoupreferthesimpleconvenienceofasmartphone? F.Thisnewdevelopmentmeanstheendoftheplasticcreditcard. G.Infactit'shappeningalready.
工业上利用N2和H2可以实现合成氨气而氨又可以进一步制备硝酸在工业上一般可进行连续生产.请回答下列有关问题 1已知N2g+O2g=2NOg△H=+180.5kJ•mol﹣1 N2g+3H2g⇌2NH3g△H=﹣92.4kJ•mol﹣1 2H2g+O2g=2H2Og△H=﹣483.6kJ•mol﹣1 写出氨气经催化氧化完全生成一氧化氮和水蒸气的热化学方程式为. 2在一定体积的密闭容器中进行如下化学反应N2g+3H2g⇌2NH3g其化学平衡常数K与温度t的关系如下表 完成下列问题 ①比较K1K2的大小K1K2填“>”“=”或“<” ②在同温同压下判断该反应达到化学平衡状态的依据是填序号 A.2vH2正=3vNH3逆B.2vN2正=vH2逆 C.容器内压强保持不变D.混合气体的密度保持不变 3硝酸工业的尾气NO可用于制备NH4NO3其工作原理如图. ①其阴极的电极反应式为. ②常温下1LpH=6的NH4NO3溶液中cNH3•H2O+cOH﹣=mol•L﹣1. 4工业上生产尿素的化学方程式为2NH3g+CO2g⇌CONH22s+H2Ol 在T℃体积为4L的密闭容器中通入6molNH3和3molCO2反应达到平衡时cNH3=0.5mol•L﹣1eCO2=0.25mol•L﹣1.若此时保持T℃和平衡时容器的压强不变再向体积可变的容器中充入3molNH3则此时反应的V正V逆填“>”“<”或“=”.再次平衡后平衡常数为. 5已知KspAgCl=1.8×10﹣10若向50mL0.09mo1•L﹣1的AgNO3溶液中加入50mL0.10mol•L﹣1的盐酸混合后溶液中的Ag+的浓度为mol•L﹣1.
假定你是李华上个月你从外教Mr.Brown那里借了一本海明威Hemingway的小说老人与海TheOldManandtheSea但不慎将书丢失.为此请你给Mr.Brown写一封道歉信.信的内容包括 1道歉 2说明丢失原因 3提出补救措施 注意 1词数100左右 2可适当增加细节以使行文连贯. DearMr.Brown I'mwritingthislettertomakeanapologytoyoufor.
如图所示A和B为竖直放置的平行金属板在两极板间用绝缘线悬挂一带电小球.开始时开关S闭合且滑动变阻器的滑动触头P在a处此时绝缘线向右偏离竖直方向电源的内阻不能忽略则下列判断正确的是
Forthousandsofyearspeoplehavesailedacrosstheoceanstotradeexploreandtransportgoods.Howevernoteveryshiparrivesatitsportofdestination.Weatherwarnavigationmistakesandbadluckhavecausedmanyshipstosinktothebottomoftheocean.Theseshipwreckswhichareestimatedtonumbermorethanthreemillionhavelongfascinatedus.Inadditiontobeinghistoricallyimportanttheysometimescontaingreatriches.Historicalresearchisakeymotivatorforshipwreckhunters.Shipscarryingdocumentsandartifactcanteachusaboutancientcivilizationsandimportantevents.Forinstancein1997thePandorawhichsankin791wasdiscoveredoffthecoastofAustralia.Thefindingsfromtheshiphelpedusunderstandtheeventssurroundingthefamousmutiny暴动onanothership﹣﹣﹣﹣﹣theBounty.AnotherimportantdiscoveryofftheUScoastin1996iswidelybelievedtobetheQueenAnn'sRevengetheflagshipoftheprivateBlackbeard.Profitisanothermotiveforshipwreckexplorationascompaniesuseadvancedsonarrobotsandretrievalequipmenttofindtreasureships.OnesuchfirmisOdysseyMarineExploration.Thecompanyhasfoundhundredsofshipsincludingin2007aSpanishsailingshipcontaining500000silvercoins.Theshipwhichsank200yearsagointheAtlanticOceancarriedatreasureestimatedtobeworth$500million.SoonafterthediscoveryalonglegalbattleoverownershiprightstookplacebetweenthecompanyandtheSpanishgovernment.Caseslikethesearepartofanongoingdebateaboutprotectinghistoricallyimportantshipsfromtreasurehunters.
GoodChoice!ToVisitCanadain2017 Whetheryou´reanadventureseekercultureloverorjustoverallcurioustravelerthisyearCanadawillappealtoyouwiththeusualamountofhospitalityenthusiasmandpride. TocelebrateCanada´s150thbirthdaythegovernmentdepartmentisgivingpeoplethegiftofexperiencetheopportunitytovisitalltheDiscoveryPass.ThispreferentialtermwillbevalidformMay202017untilOctober222017.Thoughthereareplentyofsplendidsceneryforyoutotourherearetwositesyoucannotavoidvisiting. *CanadianRockyMountainParks InthisareaknowtotheworldastheCanadianRockyMountaintherearefivenationalparksBanffNationalPark.ThesespectacularsitesweredeclaredaUNESCOWordHeritageSiteunderthenameCanadianRockyMountainParks.Youcanenjoywatchingwildanimalsandtakingpartinoutdooractivitieslikemountainbikinghikingfishinginthesummeraswellasskiingsnowboardingsnowshoeingandsleddinginwinter. TheusualDiscoveryPasspriceforRockyMountainParks PerAdult$60 Perchildunder16free Ticketsareavailableeitheronlineorattheattraction *NiagaraFallsStatePark ExperiencethepowerofNiagarafallsclosewhenyouridetheworldfamousMaidoftheMistMoattourorstandendertheBridalVeilFallsintheCaveoftheWinds.Eventhoughtheparkisopen365daysayeartheopeningofourattractionsisbasedoniceconditionsintheNiagaraRiver.SothebesttourtimetovisitNiagaraFallsissummerwhenithasthemosttremendouspower.DoitallwithaNiagaraFallsDiscoveryPassandmakememoriesthatwilllastalifetime! TheusualDiscoveryPassPriceforNiagaraFalls Adultabove16yearsold$40 Child6﹣16yearsold$30 NiagaraFallsoffersFREEadmissiontoalltheattractionstochildrenunder5 BuyyourDiscoveryPassonlineorattheattractions 21.WhatgiftwillCanadiangovernmentgivetothetouristsin2017? A.FreeAdmissionsforallthefamousattractions. B.AfreeDiscoveryPassforeachluckytourist. C.OfferingtastyCanadianfoodforfree. D.VisitingthefamousCanadianattractionsathalfprice. 22.IfyouvisitRockyMountainParksinJulywhattouristactivityyoucannottakeparting? A.Hiking B.Fishing C.Dogsledding D.Watchingwildanimals 23.ThebestseasontovisitNiagaraFallsissummermainlybecause. A.youcanridetheMistBoat B.theparkisopenonlyinthisseason C.thereisiceintheriver D.theFallhasthemosttremendouspower 24.Howmuchwillacouplewithafive﹣year﹣oldsonspendatleastiftheyvisitbothtowattractions? A.$100 B.$200 C.$260 D.$300.
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.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. Lilyisagoodfriendofme.SheisanexchangestudentfromAmericathathasbeenstudyinginChinaforoneandahalfmonth.InordertomakefulluseofhershortstayhereLilyworkshardly.BecauseshehadnotstudiedanyChinesebeforecomingsoshehasmuchtroublecommunicatingwiththelocalpeople.Shegotupearlyinthemorningtostudyafterclass.SheissoindependentwhilelivefarfromherfamilyandquitehelpfultoourChinese.HoweverbusysheisshewouldrathertakehertimehelpuswithourEnglish.
如图所示两根相距L=0.8m电阻不计的平行光滑金属导轨水平放置一端与阻值R=0.3Ω的电阻相连导轨x>0一侧存在沿x方向均匀增大的稳恒磁场其方向与导轨平面垂直变化率k=0.5T/mx=0处磁场的磁感应强度B0=0.5T一根质量m=0.2kg电阻r=0.1Ω的金属棒置于导轨上并与导轨垂直棒在外力作用下从x=0处以初速度v0=4m/s沿导轨向右运动运动过程中电阻消耗的功率不变则
Ifyouhaveeverhadacatorhavewatchedoneofthemanyfunnycatvideosonlineyou'llknowthatcatshaveamindoftheirown.Alotofthethingstheydoarehardtounderstand﹣﹣﹣theyliketoclimbuptallfurniturefitthemselvesinsmallspacesandattacksmallobjectsfornoreasonatall. Nowscientistshavemanagedtofigureoutwhatexactlyisgoingoninthebrainsofourlittlefriends.AccordingtoTonyBuffingtonaprofessoratOhioStateUniversityintheUScats'strangebehaviorlargelycomesfromtheirwayoflifebackinthewild.Catstodaystillhavemanyofthesameinstincts本能thatallowedthemtoliveinthewildformillionsofyears.hesaidinaTEDTalk.Tothemourhomesaretheirjungles. Inthewildcatsarehunters.Theirbodiesandgreatbalancingabilitiesallowthemtoclimbtohighspotstobetterlookattheenvironment.Eventhoughtheydon'thavetohuntanymoreinhumanhousestheystillkeeptheoldhabitofviewingthelivingroomfromforexamplethetopoftherefrigerator. Cats'huntinginstinctisalsowhatmakesthemattacksmallthingslikekeysandUSBdrives.Inthewildtheyhuntwhatevertheycangetandmostoftheanimalstheykillaresmall. Howevercatscanalsobeprey.Thisexplainswhytheyliketostayinsmallspaceslikedrawersorwashingmachines﹣﹣﹣theyarehidingortheythinktheyarehidingfrommoredangerousanimals.Thisisalsowhycatspreferacleanboxasmellyonecouldeasilyshowenemieswheretheyare. Knowinghowcats'mindsworkisnotonlyusefulforbetterunderstandingthem.Itmayalsohelpcats'ownerstobettermeetcats'needs.Forexampleownerscouldtrytomakeclimbingeasierforcatsbymovingtheirfurniturearound.Theycouldalsousefoodpuzzlestomakeeatingfeelmorelikehuntinginsteadofjustgivingfoodtothecats. 24.AccordingtoTonyBuffington. A.cats'strangebehaviorishardforpeopletounderstand B.catsaremoreusedtolivinginthewildthaninhumans'homes C.catsbehavestrangelymainlybecauseofsomeinstinctsinthewild D.cats'instinctsareashelpfultothemtodayastheyweremillionsofyearago 25.WhichofthefollowingstatementsisTRUEaccordingtothetext? A.Catsliketoclimbuphighbecausetheywanttohidefromdangerousanimals B.CatsattackkeysandUSBdrivesbecausetheyhaveahabitofhuntingsmallanimals C.Catsenjoystayinginsmallspacesbecausetheyusuallyliveinsmallcavesinthewild D.Cats'preferenceforacleanboxprobablyhassomethingtodowiththeirhuntinginstincts 26.TheunderlinedwordpreyinParagraph5probablymeans. A.ananimalthatistoolazy B.ananimalthatlikeshidinggames C.ananimalthatkeepsitselfclean D.ananimalthatishunted 27.Thisarticleismainlywrittento. A.explorethereasonsbehindcats'strangebehavior B.describecats'pastwildexperiencetoreaders C.tellcatownershowtomakelifeeasierforcats D.comparecats'behaviorinhumanhomeswiththatinthewild.
10分下面短文中有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词符号∧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. AcenturybeforeabirdcalledthepassengerpigeonlivedinNorthAmerica.Thereweresomanypassengerpigeonswhenpeopleoftensawthousandsevenmillionsofbirdsflyingoverhead.Thereforethereisnotasingleonelefttoday.Whathappened?Howdidallpassengerpigeonsdisappearfromtheearthentire? Thepassengerpigeonsbecomeextinctfortworeason.Firsttheforeststhatitlivedwascutdowntomakewaywithfarmsandcities.Secondmanypigeonswereshotandeatenbecausetheyweretoogoodtoeat.Atthattimetherewerenohuntinglawsprotectendangeredspeciesastheyarenow.
如图甲所示轻弹簧竖直放置下端固定在水平地面上一质量为m的小球从离弹簧上端高h处由静止释放.某同学在研究小球落到弹簧上后继续向下运动到最低点的过程他以小球开始下落的位置为原点沿竖直向下方向建立坐标轴Ox做出小球所受弹力F大小随小球下落的位置坐标x的变化关系如图乙所示不计空气阻力重力加速度为g.以下判断正确的是
如图所示为一个透明介质做成的直角三角柱的微截面其中∠A=30°∠B=90°一细光束平行于AC边从AB边的O点入射到该介质经AB边折射后直接照射在BC边上为使光束能从BC边射出三角柱求该透明介质材料折射率的范围.
如图所示圆弧轨道AB被竖直固定其下端点B的切线水平.现将可视为质点的质量为m=1kg的小球从A点由静止释放小球从B点冲出后最终打在右方的竖直墙上的C点未画出在C点的速度方向与水平方向夹角为37°已知B端与墙壁的水平距离为l=0.3m不计一切摩擦和阻力g=10m/s2则下列说法正确的是
有机物F是一种应用广泛可食用的甜味剂俗称蛋白糖它的一种合成路线如图所示 已知①A能发生银镜反应 ② ③R﹣CNR﹣COOH 请回答下列问题 1D中官能团的名称为F的分子式为. 2A的名称为反应③的反应类型为. 3反应④的化学方程式为. 4反应⑤中的另一种生成物是水则X的结构简式为. 5D有多种同分异构体请写出一种符合下列条件的有机物的结构简式 ①苯环上有2个取代基 ②与D具有相同的官能团 ③核破共振氢谱为6组峰且峰面积比为222221 6丙烯酸是重要的有机合成原料及合成树脂单体请写出以CH3CHO为原料合成丙烯酸的合成路线其它试剂任选
Onewaypeoplearerespondingtofoodsafetyconcernsisbygrowingtheirownfood.Howevernoteveryonelivesonpropertywithenoughspaceforaprivateplot.Onesolutioniscommunitygardenswhichhavebecomepopularworldwidenumbering18000inNorthAmericaalone.Inadditiontoprovidinglow﹣costdeliciousfoodthesepublicspacesoffercitiesarangeofotherbenefits. Communitygardensarelocatedinatownorcityandtendedbylocalresidents.Oftenthelandisonavacantlotownedbythecity.Thesiteisdividedintomanageableplotswhichmaybetendedbyindividualsorbythegarden'smemberscollectively.Sincethelandisusuallypubliclyownedthecostforgardenerstoleaseitisminimal.InfactNewYorkCitywhichishometomorethan750communitygardenstendedbymorethan20000memberschargespeoplejust$1ayeartoleaseaplot.Othercostsinvolvesoiltoolsseedsfencingandsoon.Howeverbecausethey'resharedbymanypeopleindividualgardenerspayverylittle. Acommunitygardencanquicklypayoffintermsofdeliciousfruitsandvegetablesinadditiontobeautifulflowers.Excessproducecanbesoldforaprofitatfarmersmarkets.Butagarden'sbenefitdon'tstopthere.Theyalsobeautifycitiesfosterstrongrelationshipsamongresidentsandloweranarea'scrimerate.Award﹣winningspaceslikeLondon'sCulpeperCommunityGardenevenattracttourists.Beautifulandaffordablecommunitygardensareoftendescribedasoasesincrowdedcities. 56.Communitygardensaredesignedforthosewho. A.areconcernedaboutfoodsafety B.liveinahousewithaprivateplot C.can'taffordtobuyorganicfood D.don'thavetheirownproperty 57.NewYorkCity. A.isownedby20000individualgardeners B.chargesresidentsalottoleasetoolsandfencing C.containsmorethan750communitygardens D.istendedbyprofessionalgardenersandlocalresidents 58.What'sthebenefitofcommunitygardens? A.Peoplecanenjoysafeanddeliciousvegetablesandanimalmeat. B.Residentsaremorefamiliarandrelatedwitheachother. C.Theneighborhoodisbecomingsaferbutoflowertaste. D.Peoplecanmakesomeprofitsfromthevisitingtourists. 59.Theunderlinedwordoasesisclosestinmeaningto. A.culturalandartcenters B.popularplatformsforexchanges C.peacefulandsafelands D.commercialandprosperousplaces.
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