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如图，以△ABC的边BC为直径作⊙O，点A在⊙O上，点D在线段BC的延长线上，AD＝AB，∠D＝30°． （1）求证：直线AD是⊙O的切线； （2）若直径BC＝4，求图中阴影部分的面积．
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如图①Rt△ABC中∠ACB=90°AB=5BC=3点D.在边AB的延长线上BD=3过点D.作DE⊥
如图在Rt△ABC中∠ACB=90°以AC为直径的⊙O.与AB边交于点D.过点D.作⊙O.的切线交B
如图以△ABC的一边AB为直径作⊙O.⊙O.与BC边的交点恰好为BC的中点D.过点D.作⊙O.的切线
如图在R.t△ABC中∠ACB=90°以AC为直径的⊙O.与AB边交于点D.过点D.作⊙O.的切线交
如图已知等边△ABC以边BC为直径的半圆与边ABAC分别交于点DE过点D作DF⊥AC垂足为点F．1判
如图以△ABC的一边AB为直径作⊙O.⊙O.与BC边的交点D.恰好为BC的中点过点D.作⊙O.的切线
如图已知点E.在△ABC的边AB上以AE为直径的⊙O.与BC相切于点D.且AD平分∠BAC.求证AC
已知如图在△ABC中AB=AC点D.是边BC的中点.以CD为直径作⊙O.交边AC于点P.连接BP交A
如图以△ABC的一边AB为直径作⊙O.⊙O.与BC边的交点D.恰好为BC的中点过点D.作⊙O.的切线
如图1Rt△ABC中∠ACB=90°AB=5BC=3点D在边AB的延长线上BD=3过点D作DE⊥AB
如图以△ABC的一边AB为直径作⊙O.⊙O.与BC边的交点D.恰好为BC的中点过点D.作⊙O.的切线
如图在△ABC中∠ABC=90°D是边AC上的一点连接BD使∠A.=2∠1E是BC上的一点以BE为直
如图在△ABC中∠CAB=90°∠CBA=50°以AB为直径作⊙O.交BC于点D.点E.在边AC上且
.如图①Rt△ABC中∠ACB=90°AB=5BC=3点D.在边AB的延长线上BD=3过点D.作DE
已知以Rt△ABC的直角边AB为直径作圆O.与斜边AC交于点D.过点D.作圆O.的切线交BC边于点E
如图在Rt△ABC中∠ACB=90°以AC为直径的⊙O与AB边交于点D过点D作⊙O的切线交BC于点E
如图在Rt△ABC中∠ACB=90°以AC为直径的⊙O与AB边交于点D过点D作⊙O的切线交BC于E.
如图已知△ABC是等边三角形以AB为直径作⊙O.交BC边于点D.交AC边于点F.作DE⊥AC于点E.
如图以△ABC的一边AB为直径作⊙O⊙O.与BC边的交点恰好为BC边的中点D.过点D.作⊙O.的切线
已知以AC为直径的⊙O.与BC相切于点C.连接AB交⊙O.于点D.过点D.作⊙O.的切线交BC于点E
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Postingaphotoofthefoodyou'reabouttoeatonWeChathasbecomeadailyritual惯例;仪式formany.Oftenthisfoodinthephotoisn'tasappealingtothoselookingatitbutscientistsarenowclaimingtakingaphotoofyourfoodbeforeyoueatitmakesittastebetter. ResearchersatUniversityofMinnesota'sCarlsonSchoolofManagementclaimtakingaphotoputsyouinthemomentandindoingsoheightensyour41.Thepersontakingthephotowillonsomelevelfeelthemotivationtocontinuethepractice. Researcherswonderedaboutthepowerofritualsafternoticingthefunny42thatpeopleoftenperformbeforeeatinganddrinking.Theyconductedexperimentstoinvestigatewhetherthesekindsofhabitualbehaviourinfluencestaste. Inthefirstexperimentsomeparticipantswereaskedtoeatapieceofchocolatefollowingadetailedsetof43:‘Withoutunwrappingthechocolatebarbreakitinhalf.Unwraphalfofthebarandeatit.Thenunwraptheotherhalfandeatit.'Theotherparticipantswere44instructedtorelaxforashortamountoftimeandtheneatthechocolatebarhowevertheywanted. Theresultsshowedthatthosewhohadperformedtheritualratedthechocolatemore45enjoyeditmoreandwerewillingtopaymoreforthechocolatethantheothergroup. Asecondexperiment46thesefindingsshowingthat47movementsdon'tproduceamoreenjoyableeatingexperience.Thedataalso48thatalongerdelaybetweenritualandconsumptionenhancedtheseeffectsevenwithacommonfoodlikecarrots. Whiletheseritualsmayseeminsignificanttheresearchersnotethattheeffectstheyproducearequiteamazing.Andwhileritualsare49beforemealtimestheycouldplayaroleinother50too.
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.每处错误仅涉最一个单词的增加删除或修改.增加:把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.Inourlifeweoftenregretwhatwedidandwhichwecouldn'tdo.Actuallyitdoesn'tbenefitusatall.Asformostofuswemissedmanychancetoearnmoremoneytogetahighpositionandtorealizeourdreams.Weoftenregretthatwedon'tseizethoseopportunitiesthusfeelupset.AlthoughwedoknowregrettingthePastisnobenefitbutwestillcan'thelpdoingitToavoidtheproblembelowweneedtopaymoreattentiontowhatyouaredoingnowmakingusbusierandhavingnotimetorecallthepast.Moreoverwe'dbettersetreasonablygoalsonebyone.Onlybydoingsocanwestruggleforourfuturebetter.
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ThereweresomanynightswhenIasayoungboyhadtowatchhelplesslyasmyfatherverballyandphysicallyabusedmymother.Icanstillrecallthesmellofalcoholseethefearinmymother'seyesandfeelthehopelessmiserythatcomeswhenweseepeoplewelovehurtingeachotherinincomprehensibleways. Iwouldnotwishthatexperienceonanyoneespeciallynotachild.IfIsettledowninthosememoriesIcanfeelmyselfwantingtohurtmyfatherbackinthesamewayshehurtsmymotherandinwaysofwhichIwasincapableasasmallboy.Iseemymother'sfaceandIseethisgentlehumanbeingwhomIlovedsoverymuchandwhodidnothingtodeservethepainimposeduponher. WhenIrecallthisstoryIrealizehowdifficulttheprocessofforgivingtrulyis.IntellectuallyIknowmyfathercausedpainbecausehewasinpain.SpirituallyIknowmyfaithtellsmemyfatherdeservestobeforgivenasGodforgiveusall.Butitisstilldifficult.Thesufferingswehavewitnessedorexperiencedliveoninourmemories.Evenyearslatertheycancauseusfreshpaineachtimewerecallthem. AreyouhurtandsufferingIstheinjuryneworisitanoldunhealedwoundKnowthatwhatwasdonetoyouwaswrongunfairandundeserved.Youarerighttobeoutraged.Anditisperfectlynormaltowanttohurtbackwhenyouhavebeenhurt.Buthurtingbackrarelysatisfies.Wethinkitwillbutitdoesn't.IfIslapyouafteryouslapmeitdoesnotlessenthestingIfeelonmyownfacenordoesitweakenmysadnessastothefactyouhavestruckme.Revengegivesatbestonlymomentaryrelieffromouremotionalpain.Theonlywaytoexperiencehealingandpeaceistoforgive.Untilwecanforgiveweremainlockedinourpainandlockedoutofthepossibilityofexperiencinghealingandfreedom;lockedoutofthepossibilityofbeingatpeace. Withoutforgivenessweremaintiedtothepersonwhoharmedus.Weareboundwithchainsofbitternesstrapped.Untilwecanforgivethepersonwhoharmedusthatpersonwillholdthekeystoourhappiness;thatpersonwillbeourjailer监狱看守. Whenweforgivewetakebackcontrolofourownfateandourfeelings.Webecomeourownliberators.Forgivenessinotherwordsisthebestformofself﹣interest.Thisistruebothspirituallyandscientifically.Wedon'tforgivetohelptheotherperson.Wedon'tforgiveforothers.Weforgiveforourselves. 66.Whydidthewritermentionthestoryofhisfather'sabuseofhismom A.Becausehelovedhismomandwantedtofightbacksomeday. B.Becausehisfatherfinallyrealizedhisownmistakeandwasforgiven. C.Becausewitnessinghismom'ssufferingisstillhurtinghimandhasnowaytorelieve. D.Becausehefeltthathewasspirituallyrelievedfromthepainthroughforgiveness. 67.Thewriterwrotethearticleinordertotellpeoplethat. A.wemayneverhealourpainsorsufferingsintheheartunlesswelearntoforgive B.weshouldneverforgetthesufferingsburiedinourhearts C.wemaygettiedtothepersonwhoharmedusallthroughlife D.weshouldn'tworryaboutthepainswecausedsinceforgivingisalwayseasierthanimagined 68.Whatisthe4thparagraphmainlyabout A.Hurtingbackdoesnogoodtorelievingone'sownhurtsbutforgiving. B.Ifsomeoneslapsyouyoujustslapbackwhichwilllessenyourpain. C.Thesufferingswehavewitnessedorexperiencedwillliveoninourmemoriesforever. D.Afterbeinghurtifonewantstoexperiencehealingandfreedomheshouldforgetthehurt. 69.Whichofthefollowingstatementsistheclosestinmeaningtotheunderlinedsentence A.Inordertohelpothersweshouldstopforgivingandfightback. B.Thepurposeofourforgivingisnottohelpotherpeople. C.Ourforgivingisalsousefultohelpingothersthoughtheymayhavehurtus. D.Onlybyforgivingotherscanwehelpthemtobegoodpeople.
Jacklookedupandsawinthedistanceredandgreennavigationlightscomingtowardsthemandknewitmustbeanavalpatrol巡逻boatbecauseofitsspeed.Asthehummingoftheboat'spowerfulenginesdrewcloserJackbentdown. Jackthenletoutafrightenedcryasthebrilliantbeamofasearchlightbrokethedarknessandsweptthefishingboatfromheadtotail.ByitsreflectedlightJackcouldclearlyseethesimilarlooksonthefacesofotherbentones. Jackknewthatifthepatrolboatcamecloseenoughitsmenwouldsurelyseethepeoplehiddeninthefishingboat.TocollecthimselfheleanedhisheadalittlesothathecouldseeDerekstandingintheheadoftheboatholdingthetiller舵柄.Derekmanagedtowavebackatthepatrolboatasifhehadnotacareintheworld.Howimperturbablehewas! SomeoneonboardthepatrolboatswitchedonaloudspeakerandavoicemadeharshandthinbyitshorndemandedWhereareyoubound DerekshruggedandshoutedbackTellmewherethefishrunandI'lltellyouwhereIambound.Thenoiseofidlingenginesdrownedhisvoice. Sayagain!barkedthespeaker. Anywherewherethere'sfish!Derekshoutedback.Therewasapause.Theboatsdriftedclosertoeachother. Whyaren'tyoushowingnavigationlights JackwatchedasDerekpretendedtolookpuzzledandleantoutoverthesideasiftoseewhattheysaidweretrue.Theymusthaveblownoutheapologizedwithashrug.I'lllightthemagainassoonasyoustoprockingmeaboutlikethis. AboardthepatrolboatthecaptainwaswonderingifitwouldbeworthwhilesearchingthisoldfishingboatforstowawaysashowmanybreathingsoulscouldsuchashabbyboathideTheradiosuddenlycackled.Abruptlywithoutanotherwordbeingexchangedthelightwentoutandthepatrolboatstarteditsenginesspeedingoffintothedarkleavingthefishingboatfloatingaboutinthewater. 66.Jackletoutascaredcrybecausehe. A.sawsomethinginthesea B.wasafraidofbeingdiscovered C.wasblindedbythebrightlights D.wasscaredbythefacesofcompanions. 67.Thepatrolboatcaptaindidnotsearchthefishingboatashe. A.didn'tfinditworthwhile B.lookeddownupontheshabbyoldfishingboat C.trustedDerekverymuch. D.wascalledtoanotherplaceviatheradio 68.Theunderlinedwordimperturbableinthepassageisclosestinmeaningto. A.anxious B.nervous C.calm D.sociable 69.WhichofthefollowingstatementsisTRUEaccordingtothepassage A.Derekdidn'trealizethatJackandothershidinthefishingboat. B.ThecaptainwassuspiciousofwhatDerektoldhim. C.Thepatrolboatapproachedthefishingboattoinspectillegalgoods. D.DereksucceededincoveringupfortheJackandothersontheboat.
Theorangutan红毛猩猩themostinactiveofthegreatapeshasunusuallystableDNAtoo.Researchershavejustcompletedthesequencing序列oftheentiregenome基因组ofourorange﹣hairedrelativeandtheyhavefoundtotheirsurprisethatitsDNAhaschangedmuchlessdramaticallyovertimethanhasthatofhumansorchimpanzees.TheorangutanisveryuniquesaysDevinLockeastructuralgeneticistheadingtheorangutansequencingproject.Theorangutangenomehadoneotherbigsurprise.LockeandcolleaguessequencedsixSumatranandfiveBorneanorangutanswhichareclassifiedasdifferentspecies.Theapeshavebeenphysicallyseparatedforatleast21000years﹣thelasttimelandbridgesbetweenthetwoislandsexisted﹣andearlierstudiesestimatedthattheybecamedistinctspeciesmorethan1millionyearsago.ButthenewanalysisreportedonlinetodayinNaturerewriteshistory:itappearstheypartedwaysjust400000yearsago.MostpreviousstudiesusedsmallsetsofmarkersandalimitedamountofDNAsequencesaysLocke.Thestatisticalpowerissomuchgreaterwhenyouhavethewholegenomeavailable.Theorangutannowjoinschimpanzeesandhumansasthethirdgreatapetohaveitsgenomesequenced.TheorangutangenomeisawonderfulresourcesaysevolutionarygeneticistSvantePääbooftheMaxPlanckInstituteforEvolutionaryAnthropologyinLeipzigGermany.ItwillhelpclarifyhoweachpartofhumanandAfricanapegenomesarerelatedtoeachotherandevolved.Suchinsightsarealreadycomingin.Orangutansoriginatedsome12millionto16millionyearsagogivingtheirgenomesmuchmoretimetoevolvethanthoseofhumansandchimpanzeeswhichsplitintotheirownlineages血统5millionto6millionyearsago.Butacomparisonofthethreegenomesshowsthathumansandchimpanzeesloseorgainnewgenesattwicetherateoforangutans.ThereasonmayhavetodowithstretchesofDNAcalledretrotransposons.Thesekeydriversofevolutionjumparoundthegenomecreatingnewgenesdamagingexistingonesoralteringgeneregulation.ThenewdatarevealthatcommonretrotransposonsknownasAluelementshavemovedaroundtheorangutangenomemuchlessthantheyhaveinthehumanandchimpanzeegenomes.Idon'twanttosaythat‘Aluretrotranspositionevents'areshutoffinorangutansbutthey'vebeencoveredupsaysLocke.Theresearchersalsodiscoveredthatovertimethestructureoforangutanchromosomes染色体haschangedlittlewhichmaybelinkedtotheAluelementfinding.Otherresearchershavesuggestedthatthestrongandhealthystructuralvariationinhumansandchimpsmayhavestimulatedincreasedintelligence.ButLockenotesthatorangutansarealsohighlyintelligent.Iforangutanshavehadverylittlestructuralvariationmaybethisdecouplesstructuralvariationfromintelligencehesays.AseparatebutrelatedstudypublishedtodayinGenomeResearchreportsyetanotherunexpectedfindingfromacomparisonofthethreegreatapegenomes.AteamledbyMikkelH.SchierupandThomasMailundofAarhusUniversityinDenmarkbothco﹣authorsoftheNaturereportdiscoveredthatsomeregionsofthehumangenomemorecloselyresembletheorangutanthanthechimpanzee.ThisreflectsthefactthatatthetimehumanssplitofffromacommonancestorwithchimpsbothspecieshadthesameancestralorangutanDNA.Buthumansandchimpanzeeshaveevolvedseparatelyformillionsofyears.IntheprocesschimpsformysteriousreasonslostsomeorangutanDNAthathumanskeptpossessionof.Moresurprisesaresuretocomeasresearcherscomparethegenomesofevenmoreapes.Projectstosequencetheothertwogreatapesgorillasandbonobosareunderway.74.OrangutansfromtwoislandsSumatranandBorneanbecamedifferentspeciessince.A.atleast21000yearsagoB.over1millionyearsagoC.some12millionto16millionyearsagoD.400000yearsago75.WhichofthefollowingstatementsisTRUEaccordingtothispassageA.ComparedwiththeDNAoforangutanchimpanzee'sislesschangedovertime.B.Onlythreeapes'genomeshavebeensequenceduptonow.C.Humans'ancestorssteppedontheirwayofevolution12to16millionsyearsago.D.Chimpanzeesgainnewgenesfasterthanorangutansdoinevolution.76.Thereasonoforangutan'slittlechangeinDNAisthat.A.thisspeciesisnotasactiveinintelligenceashumansorchimpanzees.B.thenewlyidentifiedAluelementsisbelievedtohaveplayedaspecialroleC.AluretrotranspositionsinorangutanareshutoffduringthecourseofevolutionD.orangutan'slowintelligencefailstostimulatethechangeofitsDNA77.Someregionofhumangenomeismoresimilartothatoforangutanthanchimp'sbecause.A.humanandorangutansharethesameancestorbutchimpdoesn'tB.humansandchimpanzeeshaveevolvedseparatelyformillionsofyearsC.chimpsfailedtohangontoorangutanDNAforsomeunknownreasonbuthumandidn'tD.chimpsdidn'tactasactivelyashumansresultingintheirlosingsomecriticalorangutanDNA.
Beingskinnyisnotbeautifulbutbeinghealthyis.Mostyoungpeopleunfortunately25convincethatbeingthinandthereforebeingstylishisamajorwayofmaintainingself﹣worth.Tomakethematterworsetheymighttakethissofarthattheyarelikelytoendup26eatingdisorders. Eatingdisordersarepsychologicalillnessesdefinedbyabnormaleatinghabits27mayinvolveeitherinsufficientortoomuchfoodintaketothedamageofanindividual'sphysicalandmentalhealth.Bulimianervosa暴食症andanorexianervosa食欲匮乏arethe28commonformsofeatingdisorders. 29diagnosedwithanorexianervosaarewellunderahealthybodyweight.Butpatientswithbulimianervosamayhaveabodyweightthatfallswithintherangefromnormaltooverweight.30primarilythoughtofasaffectingfemaleseatingdisordersinfluencemalesaswell. Theprecisecauseofeatingdisordersisnotentirelyunderstoodbut31isagreedthatthediseaseislinkedtoothermedicalconditionsandsituations.Besidesculturalidealizationofthinnessandyouthfulnessalsocontributesto32reduceweightforcefully.Theproblemhasaffectedalargepopulationworldwide.
Asyougetolderitfeelsliketimetendstomovefaster.AsDanArielyexplainsoveratTheWallStreetJournalwetendtofallintofamiliarroutines25weageandthatmakestimemovequickly. Weperceivetimeassomethinglikeastackofmemoriessothelessnewexperiencesyouhavethe26likelyyouaretofillinthosememorieswithinterestingthings. Timedoesgobyormoreaccuratelyitfeelsasiftimeisgoingbymorequicklytheolderweget. Inthefirstfewyearsofourlivesanythingwesenseordoisbrandnewandmanyofourexperiencesareuniquesotheyremainfirmlyinourmemories.Butas27yearsgobyweencounterfewerandfewernewexperiences﹣bothbecausewe28accomplishalotandbecauseweareslavestoourdailyroutines. Forexampletrytoremember29happenedtoyoueverydaylastweekchancesarethatnothingextraordinaryhappenedsoyouwillbehard﹣pressedtorecallthespecificthingsyoudidonMondayTuesdayetc. WhatcanwedoaboutthisMaybeweneedsomenewappthatwillencourageustotryoutnewexperiencespointoutthingswe'veneverdonerecommenddisheswe'venevertastedandsuggestplaceswe'veneverbeen.Suchanapp30makeourlivesmorevariedencourageustotrynewthingsslowdownthepassageoftimeandincreaseourhappiness. 31suchanapparrivestrytodoatleastonenewthingeveryweek.It'snottoodifficulttopush32todonewthings.
如图已知在平面直角坐标系xOy中直线y＝x﹣1分别交x轴y轴于点A和点B分别交反比例函数y1＝k＞0x＞0y2＝x＜0的图象于点C和点D过点C作CE⊥x轴于点E连结OCOD．若△COE的面积与△DOB的面积相等则k的值是．
语言运用需要足够的词汇量为基础.base.
Adropinthesun'sradiationcancausecoldwintersinpartsofNorthAmericaandEuropescientistssayafindingthatcouldimprovelong﹣rangeforecastsandhelpcountries41forstorms. Scientistshaveknownforalongtimethatthesunhasan11﹣yearcycleduringwhichradiationfromthesunreachesan42thenfalls.Butdetectingaclearlinkofthecycletotheweatherhasprovedmuch43. OurresearchnoticesalinkbetweensolaractivitiesandregionalwinterclimateleadauthorSarahInesonoftheUKMetOfficetoldthereportersinanemail. Herteamfocusedonthedatafromtherecentminimumsolarradiationperiodduring2008﹣10whichwasan44calmperiodforthesunbutatthesametime45wintersintheU.SandEuropewererecordedwhichbroughttroublestomanybusinessesandmadepeople'slivesdifficult. Theresearchersfoundthatareductioninradiationfromthesuncanaffectwindpatterns46coldwinters. Whileradiationlevelswon'ttelluswhattheday﹣to﹣dayweatherwillbetheyprovidetheexciting47ofimprovedpredictionforwinterconditionsformonthsandevenyearsahead.Thesepredictionsplayanimportantroleinlong﹣termweatherplanningInesonsaid. Ineson'steamusedthedatainacomplexcomputerto48long﹣termweatherpatterns.Itsuccessfullyreproducedwhatscientistshadobservedhappeningintheupperatmosphereduringchangesinsolarradiation.Morestudywasneededthough.Thekey49intheexperimentlayinthesatellitedatausedbecauseitspans跨度onlyafewyears.Sotherearestillquestionsconcerningwhetherthecurrentresearchresultsareaccurateandwhethertheycanbe50toothersolarcyclesshesaid.
如图已知正五边形ABCDE内接于⊙O连结BD则∠ABD的度数是
分解因式x2﹣9＝．
Tradehasaprettybadnameinsomequarters.Traderobspoorpeopleofaproperlivingandkeepsthemtrappedinpoverty.Thereisawidelyheldpopularviewthattradeisunfair. Thoughmanyclaimthatafreertradewouldchangethecurrentindecentreputationofworldmarketthecure﹣allfreetradeisthedreamofmosttextbookeconomists.InfactFreetradehasbeenusedsuccessfullybypowerfulcountriestolandtheirmass﹣producedgoodsonfreshoverseasdumpinggroundsandsqueezeoutlocalhouseholdbusinessesandcraftsmanship. Athomethestoryisdifferent.Largefirmshavelittleappetiteforfreetradeandcompetitionintheirownbackyard.Theyprefertoenjoytheadvantagesandprotectionsforwhichtheyhavecarefullyearned.Freethusfiercecompetitionhaslittleappealforthosewhounderstandthattheywillmakemoreprofitiftheycancornerthemarketwhetherathomeorabroad. Bycontrastmakingtradefairerisaboutaddressingbothoutcomesandprocessesoftrade.Fairnessisnotjustmoralrequest.Itaffectsbehaviour.Actuallytheconceptoffairnessincreasessteadilyassocietiesachievegreatermarketuprightness:Businessmenfromuprightsocietiesarewillingtopunishthosewhodonotplayfairevenifthisiscostlytothemselves. Fairertraderatherthanfreertradecouldpartlymendmal﹣administeringofresourcesincertainareas.ThoughthoughtofasevileconomicpoliciesinthewestworldcarefullyplannedspecialpreferencesandprotectionismcouldbeusedintelligentlytohelptoblocktheeconomicrobberyoftherichclassinAfricancountriesandtoimprovethelivesofthebottombillion. Fairnessisalsoimportantinthecontroloftrade.ThecurrentInternationaltradenegotiationshaveresultedinrulesfavouringthepowerful.Therulesaremadeinnegotiationsinwhichthecountriesincontrolcalltheshotsanddonotalwaysdosoingoodfaith.Industrializedcountrieswereoftenfoundtohaveobtaineddefiniteandfar﹣reachingcommitmentsfromdevelopingcountriesinexchangeforvaguepromisessuchastoliberaliseagriculturewhichtheyhavenotkept.Ontheotherhandtheessenceofthefairtradeliesinthepromisethateverypartybenefitfromthebusinessrichorpoorpowerfulorweak. Makingtradefairerisimportanttoavoidafurtherpublichateagainsttrade.Itisalsoimportantsoasbettertobalancetradegoalswithotherimportantnationalgoalssuchasenvironmentalandsocialprotection.Finallytheso﹣calledfreetradesystemneedstobemadefairersothatitdoesnotblockcompetitionandcrushinnovationandbusinessspirit.Itneedstoofferamorelevelplayingfieldtocommercialnewcomersandcompetitorsinrichandpoorcountriesalike. 74.Freetradeisaconceptatrichcountries'serviceto. A.openupnewmarketsabroad B.definetradeintheeconomictextbooks C.dumppollutantsinpoorcountries D.learntheskillsfromlocalhouseholdbusinesses. 75.Thekeymechanismoffairtradeis. A.punishingtherichcountrieswhentheycheatthepoorcountries B.makingsurethatrichcountriesprovidemorechancesforpoorcountries C.promotingspecialpreferencesandprotectionisminpoorareas D.guaranteeingthecommoninterestsofallthedealers 76.Theunderlinedwordmal﹣administeringinthepassageisclosestinmeaningto. A.macro﹣management B.overallcollection C.unevendistribution D.negativemining 77.WhichofthefollowingstatementsisTRUEaccordingtothepassage A.Largefirmsearnhugeprofitsfromfreetradeondomesticmarkets. B.Honestdealerswouldsacrificetheirowninteresttodisciplinethedishonest. C.Specialpreferencesandprotectionismareoccasionallyadoptedinwesterncountries. D.Afairertradehelpstoeasecompetitionbetweentherichandthepoor.
已知抛物线y＝2x2﹣4x+c与x轴有两个不同的交点． 1求c的取值范围 2若抛物线y＝2x2﹣4x+c经过点A2m和点B3n试比较m与n的大小并说明理由．
Pickingauniversityisatenseperiodofaskingyourselfwhichinstitutionismostrelevant.That'swhyuniversityrankingsplaysuchavitalroleinstudentssearchingfortheirnextacademicdirection.Rankingsarealsoaninescapablepartofthereputationandbrandimageofuniversities.Nouniversitywebsiteiscompletewithouttheclaimtobeinthetop100forsomethingorotherreportedtheBBC.Thereasonissimple:Rankingshelpthemtoattractstudentsstaffandresearchinvestment. Currentlytherearenumbersofuniversityrankingsandeachhasitsownlistofcriteria.Butthemaincategoriesarethesame:academicreputationgraduates'performanceandfacultyresources. Howeverexpertspointouttherankingprocessisn'tentirelyreliable.MarkKantrowitzaUSfinancialaidresearchersaiduniversityrankingsweremostlyjustforshow.HewroteinTheNewYorkTimes.Itmaygiveyourparentsbetterbraggingrightsbutthat'saboutit. Moreoverit'snotdifficulttoseethelimitationsofuniversityrankings.Manyrankingsfocusonthenumberoftimesresearchworkiscited引用byotherresearchers.IthelpsBritishandUSuniversitiestodominateglobalrankingsbecauseEnglishisthefavoredlanguageofacademiaJohnO'LearyamemberoftheQSacademicadvisoryboardtoldTheGunrdian.AlsorankingssuchasQSmainlyfocusonthequalitiesoftheuniversityratherthanitsstudents.AnyuniversityrankingislikelytohelpstudentsmakebetterdecisionsaboutwheretostudybuttheneedtobalancethemwithothermorehumanfactorsisalsoimportantsaidPhilMossaneducationandadmissionsconsultant.Advicefromgraduatesorcurrentstudentscanbeasvaluableinprovidingagenuineinsightintotheexperienceorqualityofaparticulardegreeprogram.Itcanalsoaddanelementthatrankingscanneverconvey﹣﹣theactualemotionofauniversityexperience. 32.WhydouniversitiesconsiderrankingsimportantA A.Rankingsmakethemmoreappealing. B.Rankingsarestudents'onlyreference. C.Rankingscanincreasetheiracademiclevel. D.Rankingshelpthemcompletetheirwebsites. 33.WhatdoestheunderlinedItinparagraph4refertoC A.Acadenucresearchwork. B.Thenumberofresearches. C.Thewayofrankinguniversities. D.Thelimitationofuniversityranking. 34.AccordingtoJohnO'LearywhathelpsBritishandUSuniversitiesrankwellA A.ThewideuseofEnglishinacademia. B.Theiroutstandingqualities. C.Theirgraduates'excellentperformance. D.Theacademia'sfavortothem. 35.BesidesrankingwhatdoesPhilMosssuggestyoushouldrefertoifyou'repickingauniversityD A.Investmentineducation. B.Guidancefromprofessors. C.Informationonwebsites. D.Suggestionsfromstudents.
参与本次工业展览会的观众无不对一家参展商所推广的家庭自动报警系统赞不绝口.who.
小明参加科技节“掷飞机”比赛该项目的规则是纸飞机掷出后在空中滞留的时间越长成绩越好．查阅资料得知纸飞机在空中滞留的时间与其形状质量出手速度和出手角度有关．小明认为还可能与纸飞机表面的粗糙程度有关．为了验证自己的猜想小明准备了以下器材进行实验研究 发射器如图秒表剪刀面积质量大小和表面粗糙程度不同的两种纸AB各若干张同种纸正反面粗糙程度相同． 1发射器的弹簧压缩得越短释放后纸飞机获得的速度越大其原因是． 2写出本实验的主要步骤．
学校进行广播操比赛如图是20位评委给某班的评分情况统计图则该班的平均得分是分．
已知圆锥的底面半径为5cm母线长为13cm则这个圆锥的侧面积是
这部滑稽的电影的确分散了我注意力让我暂时忘记了这些难题.which.
NotbeingsurewhereIwanttostartthisIwillsaythatIlostmymombackinAprilofthisyear.Shewasninety﹣two.41Iwasnotexpectingherto42andIdon'tthinkshewasexpectingiteither.Iwasveryclosetomymombeinganonlychild.Wedidhave43onthesurfacebutwestillhadacloserelationship44those. Beingnewlymarriedlessthanayearandhavingmovedacoupleoftimes45Ihavehadmorechangesrecentlyinmylifethanatanyotherpointofmyfifty﹣fouryears.StabilityisoneofthegiftsthatMom46meandithadsomany47thatIwasn'tawareofuntilnow.MyhusbandandIhavemadesome48toMom'shomeandwillbemovingattheendofnextweek.Itisnowourhomebutitstillhasmy49heartinit.It'swhereIgrewupandtherearemany50thatwilllivetherewithus.AtthesametimeIamlookingforwardto51someveryhappyandmemorableoneswithmyhusband. Mom52suchabigpartinmylife.Ourliveswere53wovenbecauseshegavemehervalueswhichhavebecomestrongly54inthewomanIamtoday.Idon'thaveanychildrenwhomIcould55theseonto.HoweverMother'svaluesaffectmeeverydaywiththe56IhavewithotherswhetherIknowthemornot.IhopeMomwouldbe57ofwhoIamwhatI'vebecomebecauseofherandof58Iamgoingtolivewithmy59.ShegavemeeverythingIneededtoknowinlife:respectothersandgivehelptootherswho60itmost.IloveyouMomandIwillneverforgetyou. 41.A.However B.Otherwise C.Moreover D.Though 42.A.passout B.passaway C.passby D.passdown 43.A.promises B.agreements C.differences D.similarities 44.A.intermsof B.incaseof C.inneedof D.inspiteof 45.A.once B.since C.though D.either 46.A.saved B.brought C.gave D.taught 47.A.ideas B.thoughts C.meanings D.benefits 48.A.studies B.decisions C.changes D.remarks 49.A.son's B.father's C.mom's D.husband's 50.Amemories B.chances C.choices D.dreams 51.A.receiving B.promising C.making D.supplying 52.A.affected B.played C.controlled D.managed 53.A.brightly B.lightly C.roughly D.tightly 54.A.intended B.designed C.rooted D.admitted 55.A.hold B.pass C.drive D.reply 56A.contact B.interest C.trouble D.effect 57.A.free B.proud C.full D.certain 58.A.what B.where C.why D.when 59.A.life B.children C.husband D.time 60.A.hunt B.need C.treat D.consider
在数学拓展课上小明发现若一条直线经过平行四边形对角线的交点则这条直线平分该平行四边形的面积．如图是由5个边长为1的小正方形拼成的图形P是其中4个小正方形的公共顶点小强在小明的启发下将该图形沿着过点P的某条直线剪一刀把它剪成了面积相等的两部分则剪痕的长度是
计算+正确的结果是
温州地区常受台风侵袭为测量风速小明设计了一台简易风速仪其工作原理如图甲所示．装有挡风板和滑片P的轻质滑块与轻质弹簧套在滑杆MN上弹簧左端固定右端与滑块相连．挡风板的挡风面积为0.2米2均匀电阻丝AB长为20厘米阻值为10欧电源电压U0恒为6伏保护电阻R0为14欧电压表量程0～3伏．弹簧弹力F与弹簧长度改变量x的关系如图乙所示．无风时滑片P在A处有风时滑块移动稳定后读出电压表示数计算并查阅下表数据可知风速及风级． 表中风压p是指与风向垂直的受风面上单位面积增加的压力即单位面积受到的风力．测量时保证风垂直吹在挡风板上不计一切摩擦阻力． 1在滑片P左移的过程中电路的总电阻．选填“变大”“不变”或“变小” 2当电压表示数U为2伏时风速仪所测的风为几级写出计算过程 3小明想在风速仪的电压表上直接标出风速查阅资料后获知该挡风板所受的风力与风速的平方成正比．经计算他画出了风速v与电压表示数U的关系曲线如图丙所示．后因保护电阻R0损坏他将其换成了阻值为5欧的电阻请你在图丙坐标系中大致画出更换电阻后的风速v与电压表示数U的关系曲线并在曲线上标出所能测量的最大风速的对应点Q．
计算﹣23+×8．
众所周知大量砍树对自然平衡有灾难性的影响.As.
AroundfouryearsagoIreceivedacallfromtheprincipalofourschoolastotheParentsViewtalkthenextmorning.Heaskedmetospeaktothegroup.Afterthecallmywholebodybecamefeverishandpanicky.Thetimefromhiscalltothenextmorningseemedlikeyears.ThewholenightIcouldnotsleepwithmanyominousapprehensionsinmind.OneofthemwastocalltheprincipalwithregretandtellhimthatIcouldnotcome.FinallyIgatheredsomecourage.IthoughtIfImissthisopportunitysurelytheschoolwillneverinvitemeagaintoanyoftheirprograms.Ireachedtheschoolintime.Beforemyturncamemywholebodywastrembling.WhenmyturncameandIstartedspeakingmyheartbeatincreasedandmymouthwentdry.Iwasn'tevenabletoreadthewrittenspeechproperly.IwasnotawareofwhereIwasstandingandwhatIwasreading.ThatwasthedaywhenIrealizedmybiggestweaknessPublicSpeaking.AftermyspeechImetwiththeprincipalandexplainedwhathappenedtome.Hetoldmethatthishappenstoeveryone.Evengreatspeakerfacedthesamethingswhentheystarted.HesuggestedthatIcomeagainnexttime.AroundonemonthlaterIwasinvitedtorefertoatopiconMotivation.ThistimeIwasfeelingcomfortable.MyspeechwasnotonlyappreciatedbytheprincipalaswellastheteachersbecauseIwasabletogetmyideaacrosstothem.Theyencouragedandpraisedmyefforts.AfterdeliveringissuccessfullyIbecamemoreconfident.lsaidtomyselfIfIcanspeakinfrontofsuchalearnedaudienceliketheprincipalwhoeducatesothersIcannowspeakinfrontofotherstoo.IstarteddeliveringlecturesinmyplantonvarioustopicslikeSelfMotivationPersonalityDevelopmentPersonalExcellenceSpokenEnglishandPresentationSkills.Thishasbecomeapassionforme.Ilearnedthateverythingispossibleifwehavethecouragetotakethefirststep.24.WhichofthefollowingisthehesttitleforthepassageAA.PracticeMakesaManaBetterSpeechmakerB.PublicSpeakingMakesaManEmbarrassed.C.PrincipalProvidestheBestChances.D.SpokenEnglishDevelopsinMaltingSpeeches.25.TheauthorhadbadfeelingsbeforethespeechbecauseD.A.hedislikedtheideaofgivingalectureB.hehadgotahighfeverbeforethatC.heregrettedacceptingtheinvitationD.hefearedhecouldn'tperformitproperly26.WhatdoestheunderlinedpartominousapprehensionsinthefirstparagraphmeanBA.Unluckyopportunities.B.Negativeideas.C.Curiousviews.D.Happycomments.27.WhatcanweconcludefromthepassageCA.Nothingistobegotwithoutpainsbutpoverty.B.Knowledgemakeshumbleignorancemakesproud.C.Ajourneyofathousandmilesbeginswithasinglestep.D.Necessityisthemotherofinvention.
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