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已知两点A（﹣2，0），B（0，2），点C是圆x2+y2﹣2x＝0上任意一点，则△ABC面积的最大值是（ ）
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高二上学期数学《》真题及答案
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已知两点A.-20B02点C.是圆x2+y2-2x=0上的任意一点则△ABC的面积最小值是_____
已知两点A.﹣10B.02点C.是圆x﹣12+y2=1上任意一点则△ABC面积的最小值是.
已知以点A.－12为圆心的圆与直线l1x＋2y＋7＝0相切.过点B.－20的动直线l与圆A.相交于M
已知以点A－12为圆心的圆与直线l1x＋2y＋7＝0相切.过点B－20的动直线l与圆A相交于MN两点
已知圆C.经过点A.﹣20B.02且圆心C.在直线y=x上又直线ly=kx+1与圆C.相交于P.Q.
已知点P.20及圆C.x2+y2﹣6x+4y+4=0.1设过P.直线与圆C.交于M.N两点当|MN|
过点P－20作直线l交圆x2＋y2＝1于A.B.两点则|PA|·|PB|＝________.
已知圆C.经过点A.﹣20B.02且圆心C.在直线y=x上又直线my=kx+1与圆C.相交于P.Q.
过点P－20作直线l交圆x2＋y2＝1于A.B.两点则|PA|·|PB|＝________.
已知圆Cx2+y2﹣8y+12=0直线l经过点D﹣20Ⅰ求以线段CD为直径的圆E的方程Ⅱ若直线l与圆
过点P.－20作直线l交圆x2＋y2＝1于A.B.两点则|PA|·|PB|＝________.
已知点
（0,2），
（2,0）.若点
在函数y = x的图像上，则使得ΔABC的面积为2的点C.的个数为 A.4B.3 C.2
1
已知点P.20及圆C.x2＋y2－6x＋4y＋4＝0.1设过点P.的直线与圆C.交于M.N.两点当|
已知点P.20及圆C.x2+y2﹣6x+4y+4=0.1设过P.直线l1与圆C.交于M.N.两点当|
已知圆M.x2＋y2－2mx＋4y＋m2－1＝0与圆N.x2＋y2＋2x＋2y－2＝0相交于A.B.
已知圆C经过点A﹣20B02且圆心C在直线y=x上又直线ly=kx+1与圆C相交于PQ两点.1求圆C
已知圆C.经过点A.﹣20B.02且圆心C.在直线y=x上又直线ly=kx+1与圆C.相交于P.Q.
已知两点A.－20B.02点C.是圆x2＋y2－2x＝0上任意一点则△ABC面积的最小值是_____
已知某个一次函数图象经过点A.02B.20是这个函数图象上的两点.1求一次函数的解析式2点C.x1y
已知圆C.经过点A.－20B.02且圆心C.在直线y＝x上又直线ly＝kx＋1与圆C.相交于P.Q.
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Bodylanguageisthequietsecretandmostpowerfullanguageofall!Itspeaks21thanwords.Accordingtospecialistsourbodiessendoutmore22thanwerealize.Infactnon﹣verbalcommunicationtakesupabout50%ofwhatwereally23.Andbodylanguageisparticularly24whenweattempttocommunicateacrosscultures. Indeedwhatiscalledbodylanguageisso25apartofusthatit'sactuallyoftenunnoticed.Andmisunderstandingsoccurasaresultofit.26differentculturestreatthe27betweenpeopledifferently.NorthernEuropeansusuallydonotlikehaving28contactevenwithfriendsandcertainlynotwith29.PeoplefromLatinAmericancountries30toucheachotherquitealot.Thereforeit'spossiblethatin31itmaylooklikeaLatinois32aNorwegianallovertheroom.TheLatinotryingtoexpressfriendshipwillkeepmoving33.TheNorwegianveryprobablyseeingthisasrudebehaviorwillkeep34﹣whichtheLatinowillinreturnregardas35 Obviouslyagreatdealisgoingonwhenpeople36.Andonlyapartofitisinthewordsthemselves.Andwhenpartiesarefrom37culturesthere'sastrongpossibilityof38.Butwhateverthesituationthebest39istoobeytheGoldenRule:treatothersasyouwouldliketobe40. 21.A.straighter B.louder C.harder D.further 22.A.sounds B.invitations C.feelings D.messages 23.A.hope B.receive C.discover D.mean 24.A.immediate B.misleading C.important D.difficult 25.A.well B.far C.much D.long 26.A.Forexample B.Thus C.However D.Inshort 27.A.trade B.distance C.connections D.greetings 28.A.eye B.verbal C.bodily D.telephone 29.A.strangers B.Relatives C.neighbors D.enemies 30.A.inotherwords B.ontheotherhand C.inasimilarway D.byallmeans 31.A.trouble B.conversation C.silence D.experiment 32.A.interrupting B.helping C.guiding D.following 33.A.closer B.faster C.in D.away 34.A.steppingforward B.goingon C.backingaway D.comingout 35.A.weakness B.carelessness C.friendliness D.coldness 36.A.talk B.travel C.laugh D.think 37.A.different B.similar C.Latin D.European 38.A.curiosity B.excitement C.misunderstanding D.nervousness 39.A.chance B.time C.result D.advice 40.A.noticed B.treated C.respected D.pleased
Anycaraccidentisfrighteningbutanaccidentinwhichyourvehicleisthrownintothewaterwithyoutrappedinsideislyterrifying.36Howevermostdeathsresultfrompanicwithoutaplanorunderstandingwhatishappeningtothecarinthewater.Byadoptingabrace支撑positionactingdecisivelyandgettingoutfastyoucansaveyourselffromasinkingvehicle. Braceyourselfforimpact撞击力.Assoonasyou'reawarethatyou'regoingofftheroadandintoabodyofwateradoptabraceposition.Theimpactcouldsetofftheairbagsysteminyourvehiclesoyoushouldplacebothhandsonthesteeringwheelinthetenandtwoposition. Undoyourseatbelt.37Untiethechildrenstartingwiththeoldestfirst.Forgetthecellphonecall.Yourcarisn'tgoingtowaitforyoutomakethecall. 38Leavethedooraloneatthisstageandconcentrateonthewindow.Acar'selectricalsystemshouldworkforuptothreeminutesinwatersotrythemethodofopeningitelectronicallyfirst.Manypeopledon'tthinkaboutthewindowasanescapeoptioneitherbecauseofpanicormisinformationaboutdoorsandsinking. Breakthewindow.Ifyouaren'tabletoopenthewindoworitonlyopenshalfwayyou'llneedtobreakitwithanobjectoryourfoot.Itmayfeelcounter﹣intuitive有悖常理的toletwaterintothecar.39 Escapewhenthecarhasequalized.Ifithasreachedthedramaticstagewherethecarcabinhasbeenfilledwithwaterandithasbecomebalancedyoumustmovequicklyandeffectivelytoensureyoursurvival.40Whilethereisstillairinthecartakeslowdeepbreathsandfocusonwhatyou'redoing. A.Openthewindowassoonasyouhitthewater. B.Survivingasinkingcarisnotasdifficultasyouthink. C.Ittakes60to120secondsforacartofillupwithwaterusually. D.Suchaccidentsareparticularlydangeroustotheriskofdrowning. E.Inconclusionifyouknowwhattodointhewateryouwillbesafe. F.Thisisthefirstthingtoattendtoyetitoftengetsforgotteninthepanic. G.Butthesoonerthewindowisopenthesooneryoucanescapedirectlythroughit.
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JaneEyre JaneEyreanovelwrittenbyCharlotteBrontewaspublishedin1847inEngland.ItisCharlotteBronte'smostfamousbook.JaneEyreisalovestory.IttellsaboutayoungandindependentwomancalledJaneEyrewhoisbraveenoughtopursueherownlove. UncleTom'sCabin UncleTom'sCabinisananti﹣slaverynovelbyAmericanauthorHarrietBeecherStowe.Publishedin1852thenovelhelpedlaythebasefortheCivilWaraccordingtoWillKaufman.WhenAbrahamLincolnmetStoweatthestartoftheCivilWarLincolndeclaredSoitisthelittleladywhostartedthisgreatwar.ThecharacterofUncleTominthenovelisalongsufferingblackslave.Thesadnovelexposestherealityofslavery. GonewiththeWind GonewiththeWindisanovelbyMargaretMitchellin1936.IttellsthestoryofScarlettO'HaraandheradventuresintheAmericanSouthduringtheCivilWar.ShefallsinlovewithRhettButleracitygentleman.Itisoneofthemostfamousbooksofitstimeandwasmadeintoamoviewiththesamename.ThetitletookitsnamefromthelinesanErnestDowsonpoem:IhaveforgottenmuchCynara!Gonewiththewind.Thislinealsoappearsinthebook.ThebookwonthePulitzerPrizeonMay31937. RichDadPoorDad RichDadPoorDadisabookbyRobertKiyosakiandSharonLechter.InthestoryRobert'sownfatherwasthesuperintendent厅长ofeducationinHawaiiandendupdyingpenniless.Hisbestfriend'sfatherdroppedoutofschoolatage13andwentontobecomeoneofthewealthiestmeninHawaii.Itadvocatesfinancialindependencethroughinvestingrealestate地产owningbusinessesandtheuseoffinanceprotectiontactics. 21.WhosebookhadagreatimpactontheCivilWarintheU.S.? A.CharlotteBronte's. B.HarrietBeecherStowe's. C.MargaretMitchell's. D.RobertKiyosakiandSharonLechter's. 22.WherewasthenameofthebookGonewiththeWindtakenfrom? A.Anadventurousstory. B.TheCivilWar. C.Apoem. D.ThePulitzerPrize. 23.WhowillbeinterestedinthebookRichDadPoorDad? A.Awomanwhoiseagerforfreelove. B.AhistorianwhostudiesthehistoryoftheU.S.A. C.Abusinessmanwhowantstobewealthy. D.Apoliticianwhowarnstoenterpolitics.
如图矩形ABCD中AB＝6AD＝3EF分别是CDAB的中点将△AED沿折痕AE折起使点D旋转到D1的位置使平面AED1与平面ABCE垂直利用建好的空间直角坐标系使用空间向量坐标法完成下列问题改换坐标系或不使用空间向量坐标法不给分 1证明BE⊥平面AED1 2求二面角A﹣D1E﹣C的余弦值．
WhenIwas8yearsoldIoncedecidedtorunawayfromhomeafteraquarrelwithmymother.WithmysuitcasepackedandsomesandwichesinabagIstartedforthefrontdoor. MymomaskedwhereIwasgoing.I'mleavinghomeIsaid. What'sthatyou'recarrying?sheasked. SomeclothesandfoodIreplied. Ifyouwanttorunawaythat'sallright.shesaid.Butyoucameintothishomewithoutanythingandyoucanleavethesameway. Ithrewmysuitcaseandsandwichesonthefloorandstartedforthedooragain. WaitaminuteMomsaid.Youdidn'thaveanyclothesonwhenyouarrivedandIwantthemback. Thisreallyinfuriatedme.ItoremyclothesoffshoessocksunderwearandallandshoutedCanIgonow? Yesmymomansweredbutonceyouclosethatdoordon'texpecttocomeback. IwassoangrythatIshutthedoorforcefullyandsteppedoutofmyhome.ThenInoticeddownthestreettwoneighborgirlswerewalkingtowardourhouse.IwassoshythatIsawthebigspruce云杉treeinouryardandjumpedunderthelow﹣hangingbranches.Apileofdried﹣upbrownneedles针状物werebeneaththetreeandyoucan'timaginethepainthosesharpneedlescausedtomybody. AfterIwassurethegirlshadpassedbyIrantothefrontdoorandknockedatitloudly. Who'sthere?Iheard. It'sBilly!Letmein! ThevoicebehindthethedooransweredBillydoesn'tlivehereanymore.Heranawayfromhome. LookingbehindmetoseeifanyoneelsewascomingdownthestreetIbeggedMom!I'msorry.I'mstillyourson.Letmein! ThedooropenedandMom'ssmilingfaceappeared.Didyouchangeyourmindaboutrunningaway?sheasked. What'sforsupper?Ismiledback. 4.Whentheauthorwasleavinghomehismotherorderedhimto. A.stayathome B.takesomesandwiches C.leaveeverythingbehind D.checkhissuitcasecarefully 5.Whichofthefollowingcanbestdescribetheauthor'smom? A.Selfishandproud. B.Strictbutloving. C.Kindandhelpful. D.Wisebutimpatient. 6.Theunderlinedwordinfuriatedprobablymeans. A.surprised B.warned C.encouraged D.angered 7.Whydidtheauthorjumpunderthelow﹣hangingbranches? A.Toavoidbeingseen. B.Tofindsomeneedles. C.Toplayajokeonthetwogirls. D.Toattractthetwogirls'attention. 8.ThelastsentenceWhat'sforsupper?mainlyshowsthattheauthor. A.feltveryhungryatthattime B.changedhisplantoleavehome C.wishedtoeatsomethingbeforeleaving D.wantedtoknowwhathismotherpreparedforsupper.
ThefreezingNortheasthasn'tbeenaterriblyfunplacetospendtimethiswintersowhenthechancecameforaweekendtoSarasotaFloridamybagswerepackedbeforeyoucouldsaysunshine.IleftforthelandofwarmthandvitaminC维生素Cthinkingofbeachesandorangetrees.WhenwetoucheddowntoblueskiesandwarmairIsentupasmallprayerofgratefulness.Swimmingpoolswinetastingandpinksunsetsatnormaleveninghoursnot4intheafternoonfilledtheweekendbutthebestpart﹣particularlytomytastedulledbymonthsofcold﹣weatherrootvegetables﹣wasa7a.m.adventuretotheSarasotafarmers'marketthatprovedtobemorethanworththeearlywake﹣upcall. Themarketwhichwasfoundedin1979setsupitstentseverySaturdayfrom7:00amto1pmrainorshinealongNorthLemonandStatestreets.Basketsofperfectredstrawberriesthered﹣paintedsidesoftheJavaDawgcoffeetruck;andmostofallthetomatoes:amazinglargesoftandroundredtomatoes. Disappointedbymanyabrokenvine﹣ripened蔓上成熟的promiseI'verefusedtobuywintertomatoesforyears.NomatterhowattractivetheylookinthestoreonceIgetthemhomethey'reunfailinglydryhardandtasteless.ButIhomedinwithuncertaintyononeparticulartableattheBrown'sGroveFarm'sstandfulloffreshandsofttomatoesthesizeofmyfist.Theseweretherealdeal﹣andatthatmomentIrealizedthatthebestpartofSarasotainwinterwasgoingtobeeatingthingsthatbackhomeinNewYorkIwouldn'tbeexperiencingagainformonths. DelightedasIwasbythetomatoesinsightmyhappinessdeepenedwhenIlearnedthatBrown'sGroveFarmisoneofthesuppliersforJackDustyanewlyopenedrestaurantattheSarasotaRitzCarltonwhere﹣luckilyforme﹣Iwasplanningtohavedinnerthatverynight.WithoutevenseeingthemenuIknewI'dbeorderingeverytomatoonit. 1WhatdidtheauthorthinkofherwinterlifeinNewYork? A.Exciting. B.Boring. C.Relaxing. D.Annoying. 2Whatmadetheauthor'sgettinguplateearlyworthwhile? A.Havingaswim. B.Breathinginfreshair. C.Walkinginthemorningsun. D.Visitingalocalfarmer'smarket. 3WhatcanwelearnabouttomatoessoldinNewYorkinwinter? A.Theyaresoft. B.Theylooknice. C.Theytastegreat. D.Theyarejuicy. 4Whatwastheauthorgoingtothatevening? A.Gotoafarm. B.Checkintoahotel. C.Eatinarestaurant. D.Buyfreshvegetables.
阅读下面短文在空白处填入1个适当的单词或括号内单词的正确形式答案写在答题卡上. Amousebecauseofan61luckchancemadeclosefriendswithanevilfrog.Oneday62frogplayedatrickonthemouseby63tieafootofthemousetohisown.Atfirstbothofthemjoinedtogetherandthefrog64leadhisfriendtowardthepoolinwhichhelivedanddidn'tstop65hereachedthesideofthewater.Thenthefrogsuddenlyjumpedintothewaterandthemousewaspulledinwith66he.Thefrogenjoyedthewaterandswaminitaroundhappilycrying67ifhehaddoneagreatdeed.Theunhappymousediedsooninthewaterandhisdeadbodyfloatedaroundonthesurface68fastentothefootofthefrog.Ahawksawthedeadmousesuddenlyflewdowntowardsitcaughtitandflewaway.Thefrogstilltiedtothelegofthemousewasalsocarriedoffasa69prisonandit70eatbythehawk.Harmhatchharmcatch.
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每句中有一处错误.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. 51.Doyouknowtherewasatimethentheyweregoodfriends?.
假设你是李华暑假期间你与父母乘飞机去了西藏旅游美丽的风景和当地居民的热情让你流连忘返.请你给在美国的笔友发一封邮件叙述你的所见并发表感想.内容要点如下: 1.欣赏高原风光如高地雪山等; 2.去当地居民家做客体验当地风俗品尝美食; 3.在导游陪同下参观布达拉宫和西藏博物馆购买纪念品并到离拉萨不远的羊八井温泉沐浴; 注意:1.词数100左右开头和结尾已为你写好不计入总词数; 2.短文中不能出现与本人相关的信息. 参考词汇:西藏Tibet;布达拉宫PotalaPalace;拉萨Lhasa; 温泉hotspring;高地highland;沐浴bathevi DearBetty Duringthesummerholiday LiHua.
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假设你是李华你的朋友Jenny向你询问如何保持健康.请你给她发一个邮件提些建议.内容要点如下: 1.注意保持均衡饮食keepabalanceddiet.多吃鱼肉豆类等. 2.注意锻炼身体多参加体育活动. 3.保证充足的睡眠不要熬夜每天至少睡8个小时. 注意: 1.词数:100左右; 2.可适当增加细节以使行文连贯; 3.邮件的开头已为你写好. DearJenny Hownicetohearfromyou!Inyourletteryouaskedmehowtokeephealthy. Yours LiHua.
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Australiahaspromisedtointroducethemostcomprehensive全面的carbontradingprogramoutsideEuropein2010.ThegovernmentinCanberraplanstocutgreenhousegasemissions排放byatleastfivepercentby2020butitcouldmakebiggerreductionsifothercountriesagreetotoughertargets. TheAustraliangovernmentwarnsthatwithouttoughenvironmentalmeasuresthecountrycouldlosekeyindustriesandjobs.ClimateChangeMinisterPennyWongsaystheeconomyisunderthreatanddecisiveactionisneeded. Centraltothegovernment'sclimatechangeplanisacarbonemissionstradingprogramthatwillbeintroducedwithintwoyears.Itwouldinvolveonethousandofthenation'sbiggestcompaniesandwouldcoveraboutthree﹣quartersofAustralia'sgreenhousegasemissions. Manyscientistsbelievethatgreenhousegasessuchascarbondioxideandmethanecontributetoglobalwarming.Manyofthemarereleasedbyburningfuelssuchascoalandoil. Companieswillberequiredtobuypermitsforeachtonofcarbontheyemitalthoughbigpollutingexporterswillreceiveupto90percentoftheircarbonlicensesfree. ManybusinessleaderswantthegovernmenttodelaytheplanbecauseofthecurrentglobalfinancialcrisiswhichisslowingtheAustralianeconomy.PeterAndersonfromtheAustralianChamberofCommerceandIndustrysaysitisirresponsibletobringinacarbontradingplannow. EnvironmentalistsontheotherhandsayPrimeMinisterKevinRuddhasnotproperlyaddressedthethreatofclimatechange.Activistshadsoughtaminimumemissionscutof25percent. InsteadtheRuddgovernmentaimstocutscarbonemissionsbyatleastfivepercentof2000levelsby2020.Thatamountcouldriseto15percentiffutureglobalagreementssetsuchatarget. RayNiasoftheenvironmentalgroupWWFsaysAustraliawillpaythepriceforlowtargets.ThisisadeeplydeeplydisappointingtargetNiassaid.ItcommitsAustraliatolong﹣termclimatechange.ItwillmakeAustralia'sabilitytonegotiate协商globalagreementsveryverydifficult.Itismuchlowerthanevenwehadimagined. Australiahasoneofthehighestper﹣persongreenhouseemissionsratesintheworldbecauseofitsrelianceoncoalforelectricity. SomescientistswarnthatthevastdryAustraliancontinentwhichhasbeensufferingaseriesofdroughtsinrecentyearscouldbeoneoftheregion'shardesthitbyglobalwarming. 28.Whichgroupsupportstocutcarbonemissionsbyatleast25%? A.EnvironmentalistsB.ThegovernmentC.BusinessleadersD.Scientists 29.Whomostprobablyagreestoahighergoalofcarbonemissions? A.PennyWongB.PeterAndersonC.KevinRuddD.RayNias 30.ManybusinessleadersareagainsttheAustralianprogrambecause. A.theybelievetheprogramwillonlybenefitthebigcompanies B.theybelievetheprogramwillcausetheglobalwarming C.theydon'twanttopayextramoneyforcarbonemissions D.theydon'tthinkcarbonemissionwillsurelycausetheglobalwarming 31.Theunderlinedsentencemeans. A.TheAustraliangovernmentwillbeblamedforthelowtarget B.Australiawillsufferalotfromclimatechangecausedbycarbonemissions C.TheAustraliangovernmentwillhavetospendlotsofmoneyoncarbonemissions D.ManyAustraliancompanieswillclosedownbecauseofthelowtarget.
平面内有定点AB及动点P设命题M“||PA|﹣|PB||为定值”命题N“P点的轨迹是以AB为焦点的双曲线”则
Ifyouareafruitgrower﹣orwouldliketobecomeone﹣takeadvantageofAppleDaytoseewhat'saround.It'scalledAppleDaybutinpracticeit'smorelikeAppleMonth.ThedayitselfisonOctober21butsinceithascaughtoneventsnowspreadoutovermostofOctoberaroundBritain. Visitinganappleeventisagoodchancetoseeandoftentasteawidevarietyofapples.TopeoplewhoareusedtothelimitedchoiceofapplessuchasGoldenDeliciousandRoyalGalainsupermarketsitcanbequiteaneyeopenertoseetherangeofclassicalapplesstillinexistencesuchasDeciowhichwasgrownbytheRomans.Althoughitdoesn'ttasteofanythingspecialit'sstillworthatryasistheknobbly多疙瘩的Cat'sHeadwhichismoreofacuriositythananythingelse. Therearealsovarietiesdevelopedtosuitspecificlocalconditions.OneoftheverybestvarietiesforeatingqualityisOrleansReinettebutyou'llneedawarmshelteredplacewithperfectsoiltogrowitsoit'sapipedreamformostappleloverswhofallforit. Attheeventsyoucanmeetexpertgrowersanddiscusswhichoneswillbestsuityourconditionsandbecausethesearefamilyaffairschildrenarewellcateredforwithapple﹣themedfunandgames. AppleDaysarebeingheldatallsortsofplaceswithaninterestinfruitincludingstatelygardensandcommercialorchards果园.IfyouwanttohavearealorchardexperiencetryvisitingtheNationalFruitCollectionatBrogdalenearFavershaminKent. 1Whatcanpeopledoattheappleevents? A.Attendexperts'lectures. B.Visitfruit﹣lovingfamilies. C.Plantfruittreesinanorchard. D.Tastemanykindsofapples. 2WhatcanwelearnaboutDecio? A.Itisanewvariety. B.Ithasastrangelook. C.Itisrarelyseennow. D.Ithasaspecialtaste. 3WhatdoestheunderlinedphraseapipedreaminParagraph3mean? A.Apracticalidea.B.Avainhope.C.Abrilliantplan.D.Aselfishdesire. 4Whatistheauthor'spurposeinwritingthetext? A.Toshowhowtogrowapples. B.Tointroduceanapplefestival. C.Tohelppeopleselectapples. D.Topromoteappleresearch.
AmongallseasonsIlikesummerbest.FirstofallsummeriswhenschoolisoutandIcanspendmostofmytime21bothoutsideandin.Myparents22metogetoutinsunlightasmuchaspossible.ThisisfinesincemyfriendsandIliketo23together.Weoftengoonbiketripswhichgiveusalotof24.Besidestherearemoredaylighthoursto25.Thesunstaysoutlonger26sometimeaftereightintheevening.Thismeansthatthere'salotmore27.Icangoswimmingorjust28togetasuntan日光浴.Idon'twanttodoitfortoolong29Idon'twanttogetburnt.ThesunisthereasonwhyweoftentakeawalkoutsidewhichIbelievecanhelpusstay30.Thelastreasonisthatit'sthe31timeofyearforussincewedon'tgetverymuchsunnyweatherwherewe32.Formostoftheyearit'seithercooland33orcoldandicyinmycountry.Weonlyhavethreemonthsofreprieve缓解fromthe34weather﹣thatissummer.WhenmyneighborsandIwantto35thesummerwegoouthavebarbecues烤肉orjustsitandtalk36.Thisisagoodthingtodoatnightwhenthe37ofthedayremainsintheair.38summeristhetimeofyearthatreallyputstogethereverythingIliketo39.Itiscertainlytheseasonthat40memost.21.A.singing B.playing C.working D.studying22.A.force B.warn C.invite D.encourage23.A.goout B.lookback C.runaway D.standup24.A.luck B.time C.fun D.help25.A.keep B.enjoy C.take D.count26.A.finally B.possibly C.suddenly D.usually27.A.sunshine B.moonlight C.noise D.air28.A.run B.jump C.lie D.walk29.A.once B.because C.unless D.although30.A.busy B.simple C.young D.healthy31.A.warmest B.quietest C.hardest D.shortest32.A.getoff B.crossover C.comefrom D.hurrydown33.A.hot B.wet C.fine D.snowy34.A.lovely B.clear C.freezing D.terrible35.A.celebrate B.lookfor C.introduce D.waitfor36.A.loudly B.bravely C.happily D.politely37.A.order B.heat C.story D.smell38.A.Atfirst B.Infact C.Asusual D.Inshort39.A.teach B.answer C.experience D.examine40.A.interests B.worries C.touches D.hurts
ThefamoussingerXueZhiqianhadabigfightwithhisex﹣girlfriendontheInternetandmadeanannouncementthathewouldtakelactionagainstrumorthroughhislawyer.
Yourhousemayhaveaneffectonyourfigure.Expertssaythewayyoudesignyourhomecouldplayaroleinwhetheryoupackonthepoundsorkeepthemoff.Youcanmakeyourenvironmentworkforyouinsteadofagainstyou.Herearesomewaystoturnyourhomeintopartofdietplan. Openthecurtainsandturnupthelights.Darkenvironmentsaremorelikelytoencourageovereatingforpeopleareoftenlessself﹣consciouswhenthey'reinpoorlylitplaces﹣andsomorelikelytoeatlotsoffood.Ifyourhomedoesn'thaveenoughwindowlightgetmorelampsandfloodtheplacewithbrightness. Mindthecolors.Researchsuggestswarmcolorsfuelourappetites胃口.Inonestudypeoplewhoatemealsinablueroomconsumed消耗33percentlessthanthoseinayelloworredroom.Warmcolorslikeyellowmakefoodappearmoreappetizingwhilecoldcolorsmakeusfeellesshungry.Sowhenit'stimetorepaintgoblue. Don'tforgettheclock﹣﹣﹣ortheradio.Peoplewhoeatslowlytendtoconsumeabout70fewercalories卡路里permealthanthosewhorushthroughtheirmeals.Beginkeepingtrackofthetimeandtrytomakedinnerlastatleast30minutes.Andwhileyou'reatitactuallysitdowntoeat.Ifyouneedsomehelpslowingdownturnonrelaxingmusic.Itmakesyoulesslikelytorushthroughameal. Downsizethedishes.Bigservingbowlsandplatescaneasilymakeusfat.Weeatabout22percentmorewhenusinga12﹣inchplateinsteadofa10﹣inchplate.Whenwechoosealargespoonoverasmalleronetotalintake摄入jumpsby14percent.Andwe'llpourabout30percentmoreliquidintoashortwideglassthanatallskinnyglass. 1Thetextisespeciallyhelpfulforthosewhocareabout. A.theirhomecomforts B.theirbodyshape C.housebuying D.healthydiets 2Ahomeenvironmentinbluecanhelppeople. A.digestfoodbetter B.regaintheirappetites C.burnmorecalories D.reducefoodintake 3Whatarepeopleadvisedtodoatmealtimes? A.Fatquickly. B.Playfastmusic. C.Usesmallerspoons. D.Turndownthelights. 4Whatcanbeasuitabletitleforthetest? A.IsYourHouseMakingYouFat? B.WaysofServingDinner C.EffectsofSelf﹣Consciousness D.IsYourHomeEnvironmentRelaxing?
如图四边形ABCD中AB＝BC＝CD＝DA＝1S△ABDS△BCD分别表示△ABD△BCD的面积则S2△ABD+S2△BCD的最大值为．
△ABC中角ABC所对的边长分别为abc已知sinAsinB＝35c＝2b﹣a则cosB＝
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