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如图所示的电路中，当开关S置于a处时，电流表（内阻不计）示数为I，额定功率为16w的电动机正常工作，带动质量为0.7kg的物体以2m/s的速度匀速竖直上升．当开关置于b处时，电流表示数变为，灯泡正常...
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高三下学期物理《》真题及答案
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在如图所示的电路中电源电压保持不变当开关S.从断开到闭合时电路中
电流表的示数变小，电压表的示数变小
电流表的示数变小，电压表的示数变大
电流表的示数不变，电压表的示数变小
电流表的示数不变，电压表的示数变大
如图所示电路电源内阻不可忽略开关S.闭合后在变阻器R.的滑动触头向下滑动的过程中
电压表与电流表的示数都减小
电压表与电流表的示数都增大
电压表的示数增大，电流表的示数减小
电压表的示数减小，电流表的示数增大
某同学在将量程为500μA的电流表改装成电压表的过程中他为了能尽量精确地测量该电流表的内阻设计了如图
在如图所示的电路中电源电压保持不变闭合开关S滑动变阻器向上滑动时下列说法中正确的是
电流表的示数减小，电压表的示数不变
电流表的示数减小，电压表的示数减小
电流表的示数减小，电压表的示数增大
电流表的示数不变，电压表的示数不变
如图1所示电路中L为一电感线圈ab支路和cd支路电阻相等则
闭合开关S时，电流表A
1
的示数小于电流表A
2
的示数
闭合开关S时，电流表A
1
的示数等于电流表A
2
的示数
断开开关S时，电流表A
1
的示数大于电流表A
2
的示数
断开开关S时，电流表A
1
的示数等于电流表A
2
的示数
如图所示R1＝5ΩR2＝9Ω当开关S.断开时电流表的示数为I.＝0.2A当开关S.闭合时电流表的示数
如图所示的电路中电源电压保持不变.闭合开关S当滑动变阻器的滑片P向右移动时不变的是
电流表A示数与电流表A
1
示数的差值
电压表V示数与电流表A 示数的比值
电压表V示数与电流表A 示数的乘积
电压表V示数与电流表A
1
示数的乘积
如图所示的电路中电源电压保护不变没有变阻器的最大阴值是40Ω闭合开关S.后当滑动变阻器的滑片P.置于
如图所示的电路中R1＝30Ω当开关S.断开时电流表的示数为0.1A电源电压是V.当开关S.闭合时电流
如图所示的电路中电源电压保持不变.当开关S.从断开到闭合时电路中
电流表的示数变小，电压表的示数变小
电流表的示数变小，电压表的示数变大
电流表的示数不变，电压表的示数变小
电流表的示数不变，电压表的示数变大
如图所示电路电源内阻不可忽略.开关S.闭合后在变阻器R0的滑动端向下滑动的过程中
电压表与电流表的示数都减小
电压表与电流表的示数都增大
电压表的示数增大，电流表的示数减小
电压表的示数减小，电流表的示数增大
如图所示电路电源内阻不可忽略开关S闭合后在变阻器R.0的滑动端向下滑动的过程中
电压表与电流表的示数都减小
电压表与电流表的小数都增大
电压表的示数增大，电流表的示数减小
电压表的示数减小，电流表的示数增大
在如图所示的电路中电源电动势为E.内阻为r外电路上接有一电阻值为R.的电阻和一只自感系数很大电阻不计
如图所示电路中电阻R.1=R.2=3ΩR.3=6ΩS.扳至1时电流表的示数为1.0AS.扳至2时电流
如图所示的电路当开关S.闭合后电流表测量的是通过▲选填电源L1或L2的电流电流表的指针偏转如图所示电
如图所示电路电源内阻不可忽略开关S.闭合后在变阻器R.0的滑动端向上滑动的过程中
电压表与电流表的示数都增大
电压表与电流表的示数都减小
电压表的示数增大，电流表的示数减小
电压表的示数减小，电流表的示数增大
如图所示电路中电阻R1=R2=3ΩR3=6ΩS扳至1时电流表的示数为1.0AS扳至2时电流表示数为1
如图所示的电路中电源电压保持不变.闭合开关S当滑动变阻器的滑片P向右移动时不变的是
电流表A示数与电流表A
1
示数的差值
电压表V示数与电流表A 示数的比值
电压表V示数与电流表A 示数的乘积
电压表V示数与电流表A
1
示数的乘积
在如图所示电路中电源电压保持不变闭合开关S.后开关S1由断开到闭合下列说法正确的是
电流表A
1
示数变大，电流表A.示数也变大
电流表A
1
示数变小，电流表A.示数也变小
电流表A
1
示数不变，电流表A.示数变大
电流表A
1
示数不变，电流表A.示数变小
如图所示电路电源内阻不可忽略开关S.闭合后在变阻器R0的滑动端向下滑动的过程中
电压表与电流表的示数都减小
电压表与电流表的示数都增大
电压表的示数增大，电流表的示数减小
电压表的示数减小，电流表的示数增大
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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
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Alargebodyofresearchhasbeendevelopedinrecentyearstoexplainmanyaspectsofwillpower.Mostoftheresearchersexploringself﹣controldosowithanobviousgoalinmindHowcanwillpowerbestrengthened?Ifwillpoweristrulyalimitedresourceastheresearchsuggestswhatcanbedonetomakeitstaystrong? Avoidingtemptation__isaneffectivemethodformaintainingself﹣controlwhichiscalledtheoutofsightoutofmindprinciple.Onerecentstudyforinstancefoundofficeworkerslessattractedtocandyinthedeskdrawerthanthatontopoftheirdesksinplainsight. Theresearchsuggestingthatwepossessalimitedreservoirofself﹣controlraisesatroublingquestion.Whenwefacetoomanytemptationsarewetofail?Notnecessarily.Researchersdon'tbelievethatone'swillpowerisevercompletelyexhausted.Ratherpeopleappeartoholdsomewillpowerinreservesavedforfuturedemands.Therightmotivationallowsustotapintothosereservesallowingustocarryonevenwhenourself﹣controlstrengthhasbeenrundown.Highmotivationmighthelpovercomeweakenedwillpower﹣atleasttoapoint. Willpowermayalsobemadelessvulnerable脆弱tobeingexhaustedinthefirstplace.Researcherswhostudyself﹣controloftendescribeitasbeinglikeamusclethatgetstiredwithheavyuse.Butthereisanotheraspecttothemusclecomparisontheysay.Whilemusclesbecomeexhaustedbyexerciseintheshorttermtheyarestrengthenedbyregularexerciseinthelongterm.Similarlyregularpracticesofself﹣controlmayimprovewillpowerstrength. Theevidencefromwillpower﹣exhaustionstudiesalsosuggeststhatmakingalistofresolutionsonNewYear'sEveistheworstpossibleapproach.Beingexhaustedinoneareacanreducewillpowerinotherareassoitmakesmoresensetofocusonasinglegoalatatime.Inotherwordsdon'ttrytoquitsmokingadoptahealthydietandstartanewexerciseplanatthesametime.Takinggoalsonebyoneisabetterapproach.OnceagoodhabitisinplaceBaumeistersaysyou'llnolongerneedtodrawonyourwillpowertomaintainthebehavior.Eventuallyhealthyhabitswillbecomeroutineandwon'trequiremakingdecisionsatall. 1Fromthestudiesinthepassagewelearnthat. A.peoplehaveunlimitedself﹣control B.highmotivationensuresone'ssuccess C.willpowerishardlycompletelyexhausted D.toomanytemptationsoftenleadtofailure 2TheunderlinedphrasetapintoinParagraph3mostprobablymeans. A.makeuseof B.runoutof C.build D.increase 3Theauthorcomparesself﹣controltomuscles. A.toprovethelong﹣termeffectofwillpower B.toshowthesignificanceofregularexercise C.toarguethatself﹣controlcanheeasilyusedup D.toexplainthebenefitsofpracticingself﹣control 4Todevelopagoodhabitwhichofthefollowingdoestheauthorprefer? A.Iwillgiveupdessertanddoexercise. B.Iwillsetthreegoalsthisnewsemester. C.IwillreadanEnglishnoveleverymonth. D.Iwillkeepmyselffromanytemptation.
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.
Wildlifehasbeengreatlythreatenedinthemodernage.Therearespecies物种thatare1everyday.Thewhite﹣napedcraneisatypicalexample.Soscientistsaretryingtheirbestto2thespeciesfromgoingoutofexistence. ChrisandTimworkatazoohelpingendangeredcraneswiththeir3.Emmaafemalecranehasbeenintheir4sinceshearrivedin2004. BornataninternationalcranefoundationEmmawas5byhumancaretakers.Thisledtoanunexpected6thoughshehadawonderfultimethere.Emmahad7takenherselfasacraneandbecomedeeplyattachedtohumans.She8tolivewithmalecranesandevenhada9forkillingsomeofthemwhichmadeit10forhertobecomeamother. 11thetwozookeepersdidn'twanttoseetheextinction灭绝ofthispreciousspecies.Withtheirpatienceandeffortstheysuccessfullydevelopeda12ofartificialbreeding人工繁殖andnaturalreproduction.This13Emmatogivebirthtofivebabycranes. Thetwokeepersareproudoftheirproductivework.Butbeforetheycanbe14moreeffortsmustbemadebecausethepopulationofthecraneinthewildisonthe15andmanyotherspeciesappearheadedtowardextinction.16noteveryonehasrealizedthatwildlifehasthoughtsfeelingsandmostimportantlyequalrightstosurvive. Howcanwe17theever﹣wideninggapthatseparatesusfromotheranimals?ChrisandTimofferedusthe18humanbeingstookitforgrantedthattheir19heldallthesolutionsbutmaybetheirheartscanbeabetter20. 1A.growing B.migrating C.competing D.disappearing 2A.ban B.save C.split D.remove 3A.abortion B.recreation C.reproduction D.administration 4A.care B.eye C.mind D.story 5A.found B.chosen C.raised D.seized 6A.bonus B.consequence C.victory D.sacrifice 7A.never B.always C.unluckily D.cheerfully 8A.liked B.refused C.decided D.hesitated 9A.gift B.skill C.concern D.reputation 10A.illegal B.inspiring C.important D.impossible 11A.Therefore B.Moreover C.However D.Instead 12A.combination B.collection C.strategy D.system 13A.forced B.forbade C.taught D.enabled 14A.defeated B.grateful C.assured D.tolerant 15A.list B.rise C.agenda D.decline 16A.Incontrast B.Afterall C.Bytheway D.Onthecontrary 17A.leave B.bridge C.open D.identify 18A.course B.excuse C.answer D.reward 19A.brains B.behaviors C.services D.projects 20A.guide B.treat C.example D.companion
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
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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