首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
已知α是第二象限角，且的值为（ ）
查看本题答案
包含此试题的试卷
高三下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
已知α为第二象限角且sinα=求的值.
已知角α是第二象限角则π﹣α是
第一象限角
第二象限角
第三象限角
第四象限角
已知α为第二象限角且sinα=求的值.
已知α为第二象限角且sinα=求的值.
已知为第二象限角且求的值.
已知且为第二象限角则的值为.
已知角θ在第二象限且则在
第一象限或第三象限
第二象限或第四象限
第三象限
第四象限
已知为第二象限角且求的值.
已知α为第二象限角且sinα+cosα=则cos2α=.
已知θ是锐角那么2θ是
第一象限角
第二象限角
小于180°的正角
第一或第二象限角
已知为第三象限角则所在的象限是
第一或第二象限
第二或第三象限
第一或第三象限
第二或第四象限角
已知且是第二象限角那么的值为_____________
已知α为第二象限角则所在的象限是
第一或二象限
第二或三象限
第一或三象限
第二或四象限
已知cosb=﹣且b为第二象限角求sinb的值.
若sin2α>0且cosα
第二象限角
第一或第三象限角
第三象限角
第二或第三象限角
已知点P.的坐标为5a且点P.在第二四象限角平分线上则a=
已知α为第二象限角且sinα=求的值.
已知α为第二象限的角sinα=β为第一象限的角cosβ=求tan2α-β的值.
已知sinα=cosβ=-且αβ都是第二象限角求cosα-β的值.
已知α为第二象限角且sinα=求的值.
热门试题
更多
DirectionsReadthefollowingpassage.Summarizethemainideaandthemainpointsofthepassageinnomorethan60words.Useyourownwordsasfaraspossible. Smallbusinessesholdthekeytoemployedhappiness.Asthecalendarflipstoanotheryearmanyemployees'willconsiderstartingthenewyearonthehuntforanewjob. Intoday'schangingworkforceitismoreimportantthaneverforcompaniestorealizethatasalaryaloneisnolongerenoughtoattractorretainstrongemployees. AccordingtoasurveybyAflacsmallbusinessdeservearoundofapplausefortheirabilitytokeepemployeeshappy.Thereportfondthat85percentofsmall﹣businessemployeesarehappyintheircurrentjobandmorethanhalf51percentagreethatmostoforalloftheirhappinessintheircurrentjobisaresultofworkingforasmallbusiness. Nearlyaquarterofparticipants23percentstatedthatthefeelingofimportancewasthebestpartofworkingforasmallbusiness.Smallbusinesseshavetheuniqueabilitytomakeemployeesfeelappreciatedrespectedandvaluedonapersonalandprofessionallevel. Inasmall﹣businessenvironmenttherearetypicallyfewerlayersbetweennewcomersandleadership.Thistight﹣knitstructurecancreateafamily﹣likeatmospherethatallowsemployeestofeelthattheiropinionsmatterandthattheyplayasignificantroleinthebusiness'smission. Flexibilityisalsovitalincreatingemployeehappiness.Accordingtothereport30percentofrespondentsnotedthatflexibleschedulingwasthebestpartofworkingforasmallbusiness.Aworkplacethatpromoteshealthywork﹣lifebalancecancreatehappierlessstressedemployeesandcanalsoincreaseproductivity. Althoughsmallbusinessexcelatkeepingemployeeshappythereisalwaysroomforimprovement.Inasmall﹣businesscommunitymoneydoesnotseemtobetheonlymotivator.Infact65percentofsmall﹣businessemployeesindicatethatanimprovementintheirbenefitsofferingswouldmakethemhappier. Byofferingagreatbenefitsplanthanincludesvoluntarybenefitssmallbusinesscanensurethattheiremployeesareabletofindtherightbenefitstomeettheirindividualneeds.
诸如地震这一类的自然灾害对某些地区的影响远比其他地区更大.like .
自古以来老百姓就希望天下太平同各国人民友好相处.longfor
为了让各类型的无线网络系统都能更快速连线5G连线将使用毫米波的频率.available .
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处错误每句中最多有两处.错误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. DearSir/Madam I'mwritinginresponsetoyouradvertisementintheBingleyTimesinMarch2nd.I'mveryinterestinginjoiningyourDanceclassesandwouldbegratefulunlessyoucouldanswerafewquestionsIhave. Youradvertisementstatesthatanumberintheclasseswaskepttoaminimum.Howmuchpeoplearethereineachclass?AsIworkeverydayuntil5o'clockIwouldalsoliketoknowthetimesoftheclasses.InadditionI'dliketoknowifIneedanyspecialshoesfortheclassesandI'dgreatlyappreciateifyoucouldtellmewheretobuyanynecessaryequipments.Finallyasit'smyintentiontoattendtotheseclassesregularlycouldyoualsosendmedetailsofpricesormembershipfees? Thankyouforyourkindattention.Pleasereplyatyourearliestconvenience. Yoursfaithfully ElaineRichards
很多人对他们的潜能一无所知.ignorant
Litteriseverywheredoinggreatharm1theenvironmentandlifeonourplanet.JeffKirschnerwhowantstobuildalitter﹣freeworldstartedaglobalcommunitynamedLitterati2settlethisproblem. Thestorybeganwithhis6﹣year﹣olddaughter.Onedaytheyweregoingonahikewhenthegirlnoticeda3breakplastictub浴盆inariver.ShesaidDaddythatdoesn'tgothere.ThattookKirschnerbysurprise.Helikemanyadultshadbecomesousedtotherubbisharoundthemthathehadn'tgivenitasecondlook.4hisdaughtersaidremindedhimoftheseriousproblemourplanetfaces. Jeffstartedtotake5act.HecreatedLitteratianappthatmakesitfuntopickuplitter.Theideais6fairsimpleSpotapieceoftrashtakeaphotopostthephotoonlineandthenputthelitterintodustbins. 7seethatJeffwaskeepingarecordofthepositiveimpacthewashavingontheplanetpeopleworldwidestartedparticipating.Uptonowover2500000photospostedby3500peoplefromover40countries8findtheirwaytoLitterati'sdigitallandfill. Litteratiismorethananapp.Itisahighly9effectsolutiontoapressingissue.Whereveryoulivewhateveryoudoand10youarejoinLitteratitomaketheworldacleanerandhealthierplacetolivein.
HotAirBalloons Thebasisofhowtheballoonworksisthatwarmerairrisesincoolerair.Thisisbecausehotairislighterthancoolairasithaslessmassperunitofvolume.Masscanbedefinedbythemeasureofhowmuchmattersomethingcontains.Theactualballoonhastobelargeasittakesalargeamountofheatedairtoliftitofftheground. Theburnerusespropanegastoheatuptheairintheenvelopetomovetheballoonoffthegroundandintotheair.Thepilotmustkeepfiringtheburneratregularintervalsthroughouttheflighttoensurethattheballooncontinuestothestable.Naturallythehotairwillnotescapefromthehotattheverybottomoftheenvelopasfirstlyhotairrisesandsecondlythefloatingpowerkeepsitmovingup. Tomovetheballoonupwardsthepilotopensupthepropanevaluewhichletsthepropaneflowtotheburnerwhichinturnfreestheflameupintotheenvelope.Itworksinmuchthesamewayasagasgrillthemoreyouopenthevalvethebiggertheflametobeattheairandthefastertheballoonrises. TheParachuteValveattheverytopoftheballooniswhatisusedtobringtheballoondowntowardstheground.Itisacircleoffabriccutoutofthetopoftheenvelopwhichiscontrolledbyaropewhichrunsdownthroughthemiddleoftheenvelopetothebasket.Ifthepilotwantstobringtheballoondownheorshesimplypullsontheropewhichwillopenthevalvelettinghotairescapedecreasingtheinnerairtemperature.Thiscoolingofaircausestheballoontoslowitsrise. Thepilotcanoperatehorizontallybychangingtheverticalpositionoftheballoonbecausethewindblowsindifferentdirectionsatdifferentaltitudes.Ifthepilotwantstomoveinaparticulardirectionheorshesimplyarisesandfallstotheappropriatelevelandrideswiththewind. 1Thepurposeofthisarticleisto. A.explainhowhotairballoonswork B.illustratewhyhotairballoonsareuseful C.describehotairballoons'structure D.informreadersabouthowhotairballoonsaremade 2WhatwouldhappeniftheParachuteValvecouldnotbereleasedafteritwasopened? A.Theinsideoftheballoonwouldcontinuetoheatup. B.Theballoonwouldclimbupmorerapidly C.Theself﹣sealingvalvewouldneedtotakeovertheroleoftheParachuteValve. D.Theballoonwouldbegintomovedownmorerapidly. 3Whichofthefollowingskillsorknowledgewouldbethemostusefultoaballoonpilot? A.Theabilitytosewthepanelsoffabrictogethertomakeaballoon. B.Anunderstandingofhowpropanegasismanufactured. C.Aknowledgeofthebackgroundofpassengerswhoaretravellingintheballoon. D.Aknowledgeofaircurrentsandwinddirectionsintheareawhereheispilotingtheballoon.
A90﹣year﹣oldhasbeenawardedWomanOfTheYearfor1beBritain'soldestfull﹣timeemployee﹣stillworking40hoursaweek.NowIreneAstburyworksfrom9amto5pmdailyatthepetshopinMacclesfield2sheopenedwithherlatehusbandLes.Heryearsofhardworkhave3finalbeenacknowledgedafteracustomernominated提名hertobeCheshire'sWomanOfTheYear. PickingupherLifetimeAchievementawardproudIrene4declareshehadnoplans5retirefromher36﹣year﹣oldbusiness.IrenesaidIdon'tseeanyreasontogiveupwork.IlovecominghereandseeingmyfamilyandallthefriendsI6makeovertheyears.IworknotbecauseIhaveto7becauseIwantto. GranddaughterGayleParks31﹣whoworksalongsideherinthefamilybusiness﹣saiditremainedunknownastowhonominatedIrenefortheaward.ShesaidWedon'thaveanyideawhoputgrandmaforward.Whenwegotacall8sayshewasshort﹣listedwethoughtitwas9joke.Butthenwegotanofficialletterandwewereblownaway.Wearesoproudofher.It's10wonder.
America'slatestsuperheroAustinPerinewhocallshimselfPresidentAustinisnowtakingthecountrybystorm.Butheisnotatypicalsuperhero.TwothingssethimapartHedoesn'tfighthumanenemiesbuthungerandhomelessness.Alsohe'sonlyfouryearsold. Oursuperhero'soriginstorystartedfromthedaywhenTJPerinehisfathertookAustintotheFirehouseMinistriesalocalshelterthatprovideshousingfoodandotherservicesforthehomeless.Astheydrovebythebuildingtheysawagroupof25homelessmenstandingonthestreetcorner.ThatdayAustinusedhisallowancetobuyeachmanasandwichandhandedthefoodouthimselfwithhissloganDon'tforgettoshowlove! AfterhereturnedeveryweekforfiveweeksinarowwordofAustin'skindnessspreadthroughsocialmedia.AustinandTJcouldfeed25to50peopleatatimebeforeandnowthankstocommunitysupporttheycanfeed800to2000people. ButAustinisn'tmerelyfillingstomachs.Hehasbeenimprovingthelivesofthehomelesspeoplehemeets.OnthatfirsttriptoFirehouseMinistriesTJandAustintalkedtoapoormannamedRaymont.TherespectAustinshowedforhimtouched41﹣year﹣oldRaymontwhoregainedhisconfidenceinlifeandfinallyfoundajobwiththehelpofTJ.Allthatwasmadepossiblebecausealittleboytookthetimetocare. Austin'spassionhasbecomehisfamily'scalling.AfterraisingmoneythroughaGoFundMepageAudreyTJ'smotherestablishedthenonprofitShowLoveFoundationdedicatedtofightinghomelessness.ShenowservesaspresidentandTJoverseespublicrelationsforthefoundationfulltime.Theyoffermedicalandmentalhealthcareaspreventivestepsagainsthomelessness. AsforPresidentAustinhecontinuestogiveoutfoodsmilesandhisinspirationalmessageoflove.ItmakesmefeellikeI'msavingthedayhesaidproudly. 1WhyhasAustinbecomewell﹣knowntotheentirecountry? A.Hehassuperpowertofillthestomachsofthehomeless. B.Hefightshungerandhomelessnessatsuchayoungage. C.Hehasremovedthepovertyofthelocalcommunity. D.Hehaschosenanimpressiveanduniquename. 2WhichofthefollowingcanreplacetheunderlinedworddedicatedinParagraph5? A.Exposed. B.Opposed. C.Devoted. D.Addicted. 3WhydoestheauthorintroducetheexampleofRaymontinParagraph4? A.ToshowAustin'spositiveinfluence. B.Topersuadepeopletoliveofftheirown. C.ToprovethepersonalabilityofAustin'sfather. D.Todescribethedifficultsituationofpoorpeople. 4Whatistheauthor'sattitudetowardswhatAustindoes? A.Sympathetic. B.Humorous. C.Approving. D.Considerate.
KeepingTheTapsRunninginThirstyCities Watercovers71%ofEarth'ssurfaceyetonly2%ofitisaccessibleasasourceoffreshwater.1onthislimitedresourcesisrisingatrendlikelytocontinue. Itisimportanttorecognizethatitisnotjustcityresidentswho2water.Agricultureindustryandtourismoftenrequiremorewaterthanthemunicipalwatersupply.Globally70%offreshwateris3foragriculturebutlocallyinheavilyirrigated灌溉areasthiscanincreateto90%.Ahealthyenvironmentalsorequiresfreshwaterandthequalityofavailablewaterisasimportantasits4. Waterstressisnotalwayscausedbyphysicalshortagesindryareas.5forwaterresourcesbetweendifferentuserswithinrivercatchmentsorbasinscanalsobeacause. Everythirstycityoperateswithinitsowncontext6tothechallengeofprovidingadequatewatersupplies.CapeTown7hasfacedthreeyearsofdroughtduringwhichwinterrainsfailedtomaterialize.Attheendofthe2017rainyseasonthecityfacedthe8ofitsdamsrunningdryduring2018.Thedamswereonly37%full﹣inthesameweekfouryearsbeforetheywerefulltothetop.InJanuary2018itwas9thatCapeTownwouldreachDayZerowhenitwouldbeforcedtoturnoffthetapsinApril.Thiswasdespitethecityreducingitswaterusebymorethanhalffrom1.2billionlitresadayin2015tofewerthan600millionlitresandworking10withindustryandagriculturetoreducedemand. OnFebruary1theauthoritiesputinplaceastrictlimitof50litresofwaterperpersonperday.11inBritainthisisconsideredenoughforafive﹣minuteshowerofhalfawashingmachinecycleonfullload. Inadditionabanwasplacedonusing12waterforgardenswatermanagementdeviceswereinstalledathouseholdwithahighwateruseandthewaterpressurewasreducedtocutdemandandleaks.Atthesamethecitylaunchedamedia13tochangehabitsandintroducedhigherduties.Thisisnotwithoutitscostsagricultureandtourismbothsignificantareasofemploymenthave14.Itisaclassicexampleoftheproblemofwatereconomics﹣thecostofwaterislowbutthecostofalackofwaterisveryhigh. CrisessuchastheCapeTowndroughtareindangerofbecomingthenewnorm.The15ofDayZeromustserveasawake﹣upcallforcitiesacrosstheworldtodevelopcost﹣effectivewatermanagementstrategiestocopewithanuncertainfuture. 1A.Impact B.Pressure C.Impression D.Observation 2A.recycle B.waste C.consume D.apply 3A.restored B.abstracted C.separated D.preserved 4A.change B.source C.origin D.volume 5A.Competition B.Protection C.Construction D.Regulation 6A.contributing B.regarding C.responding D.referring 7A.inaddition B.forexample C.onthecontrary D.asaresult 8A.prospect B.illustration C.symptom D.security 9A.reported B.presented C.predicted D.explained 10A.respectively B.increasingly C.restrictively D.extensively 11A.Bycomparison B.Inotherwords C.Tooursurprise D.What'smore 12A.feasible B.drinkable C.inevitable D.influential 13A.campaign B.statement C.presentation D.advertisement 14A.invaded B.liberated C.suffered D.proceeded 15A.change B.theory C.record D.threat
Herearesomebestsellersof2018atAmazon. Thecar Fourteen﹣year﹣oldTerry'sparentsneverpayhimmuchattention.Sowhentheybothdisappearafteroneoftheirall﹣too﹣frequentargumentsTerryisn'texactlyeagerforthemtocomehome.Onhisownhefixesanabandonedcar.Thoughhedoesn'tknowmuchaboutdrivinghegetsbehindthewheelandheadswestwiththeintentionofvisitinganuncleinOregon.It'sanexcitingandsometimesdangerousjourney.AlongthewayhelearnsalotaboutpeopleaboutAmerica﹣﹣andmostimportantlyabouthimself. TheRunningDream Jessicathinksherlifeisoverwhenshelosesaleginacaraccident. Asshestrugglestocopewithherprosthesis义肢andmanyotherdifficultiesJessicadevelopsacloserelationshipwithRosaagirlwhohasacancerandseesrightintoJessica'sheart. WiththesupportoffamilyfriendsacoachandherteammatesJessicaisabletorunagain.Butthat'snotenoughforhernow.Shedoesn'tjustwanttocrossfinishlinesherself﹣shewantstotakeRosawithher. HaveaNewTeenagerbyFriday Doyouknowthisperson? Hisbedroomlookslikeagarbagedump. Shechangesclothesthreetimesbeforebreakfast. Itseemsthathe/sheneveragreeswithyou. Congratulations!Youhaveateenagerinyourhome.Butyouneedn'tfeelhelpless.Infactyou'rejustfivedaysawayfromyourteenagerasking.WhatcanIdotohelp?InternationallyrecognizedfamilyexpertDr.KevinLemanwillhelpyougetrealresults﹣reallyfast. BoyRobot Seventeen﹣year﹣oldIsaakdiscoversthetruthabouthisoriginagovernment﹣madehuman.Butadeadlymilitaryforceistryingtokillhim.HeandtheotherRobotscanonlyfindprotectionfromtheUnderground﹣asecretnetworkofRobotsandhumansworkingtogethertoensureacoexistentfuture.Isaakmustdecidewhethertoholdontohishumanityandfacepossibledeathortoembracehistruenatureinordertosurvive. Ifyouareinterestedinanyofthebooksclickhereforfurtherinformation https∥www.amazon.com/. 1Whichbookisasciencefiction? A.TheCar. B.TheRunningDream. C.HaveaNewTeenagerbyFriday. D.BoyRobot. 2Whichofthefollowingisn'tconveyedinTheRunningDream? A.Friendship. B.Modesty. C.Bravery. D.Determination. 3WhoisthebookHaveaNewTeenagerbyFridayintendedfor? A.Experts. B.Teenagers. C.Parents. D.Teachers.
在直角坐标系xOy中以坐标原点O为极点x轴的正半轴为极轴建立极坐标系已知曲线C1的极坐标方程为ρ=2sinθ直线l的参数方程为t为参数． Ⅰ求曲线C1的参数方程和直线l的直角坐标方程 Ⅱ设D为曲线C1上在第二象限内的点且在点D处的切线与直线l平行求点D的直角坐标．
MyFavouriteBooks JoUsmarisawriterforCosmopolitanandco﹣authoroftheThisBookWillseries系列oflifestylebooks.Hereshepickshertopreads. Matilda RoaldDahl IoncewroteapaperontheinfluenceoffairytalesonRoaldDahl'swritinganditgavemeanewappreciationforhisstrangeanddelightfulworlds.Matilda'sbattleswithhercruelparentsandthebossyheadmistressMissTrunchbullareequallyfunnyandfrighteningbutthey'realsoaspirational. AfterDark HarukiMurakami It'sabouttwosisters﹣Eriamodelwhoeitherwon'torcan′tstopsleepingandMariayoungstudent.IntryingtoconnecttohersisterMaristartschangingherlifeanddiscoversaworldofdiversenightpeoplewhoarehidingsecrets. GoneGirl GillianFlynn Therewasabitofmethatdidn′twanttolovethiswheneveryoneelseontheplanetdidbutthehorrorstoryisbrilliant.There'stensionandanxietyfromthebeginningasNickandAmybattleforyourtrust.It'sarealwhodunitandthefrustrationwhenyourealisewhat'sgoingonishorriblyenjoyable. TheStand StephenKing Thisisanexcellentfantasynovelfromoneofthebeststorytellersaround.Afteraseriousfluoutbreakwipesout99.4%oftheworld′spopulationabattleunfoldsbetweengoodandevilamongthoseleft.RandallFlaggisoneofthescariestcharactersever. 1WhodoesIrefertointhetext? A.StephenKing. B.GillianFlynn. C.JoUsmar. D.RoaldDahl. 2WhichofthefollowingtellsaboutMariandEri? A.Cosmopolitan. B.Matilda. C.AfterDark. D.TheStand. 3WhatkindofbookisGoneGirl? A.Afolktale. B.Abiography. C.Alovestory. D.Ahorrorstory.
MarianBechtelsitsatWestPalmBeach'sBarLouiecounterbyherselfquietlyreadinghere﹣bookasshewaitsforhersalad.Whatisshereading?Noneofyourbusiness!LunchisBechtel'smetime.AndlikemoreAmericansshe'snotalone. Anewreportfound46percentofmealsareeatenaloneinAmerica.Morethanhalf53percenthavebreakfastaloneandnearlyhalf46percenthavelunchbythemselves.Onlyatdinnertimeareweeatingtogetheranymore74percentaccordingtostatisticsfromthereport. Iprefertogooutandbeout.Alonebuttogetheryouknow?Bechtelsaidlookingupfromherbook.BechtelwhoworksindowntownWestPalmBeachhaslunchwithcoworkerssometimesbutlikemanyofustoooftenworksthroughlunchatherdesk.Alunchtimeescapeallowshertokeepabossfromtappingherontheshoulder.Sheretunstoworkfeelingenergized.TodayIjustwantedsometimetomyselfshesaid. JusttwoseatsoverAndrewMazolenyalocalvideographerisfinishinghislunchatthebar.Helikesthathecansitandcheckhisphoneinpeaceorchatupthebarkeeperwithwhomhe'sonafirst﹣namebasisifhewantstohavealittleinteraction交流.Ireflectonhowmyday'sgoneandthinkabouttherestoftheweekhesaidIt'sachanceforself﹣reflection.Youreturntoworkrechargedandwithaplan. Thatfreedomtochooseisonereasonmorepeopleliketoeatalone.Therewasatimewhenpeoplemayhavefeltawkwardaboutaskingforatableforonebutthosedaysareover.Nowwehaveoursmartphonestokeepuscompanyatthetable.Itdoesn'tfeelasaloneasitmayhavebeforealltheadvancesintechnologysaidLaurieDemerittwhosecompanyprovidedthestatisticsforthereport. 1Whatarethestatisticsinparagraph2about? A.Foodvariety. B.Eatinghabits. C.Tablemanners. D.Restaurantservice. 2WhydoesBechtelprefertogooutforlunch? A.Tomeetwithhercoworkers. B.Tocatchupwithherwork. C.Tohavesometimeonherown. D.Tocollectdataforherreport. 3WhatdoweknowaboutMazoleny? A.Hemakesvideosforthebar. B.He'sfondofthefoodatthebar. C.Heinterviewscustomersatthebar. D.He'sfamiliarwiththebarkeeper. 4Whatisthetextmainlyabout? A.Thetrendofhavingmealsalone. B.Theimportanceofself﹣reflection. C.Thestressfromworkingovertime. D.Theadvantageofwirelesstechnology.
Thekoalaisanunusualcreature.NativetoAustraliaandabitbiggerthanarabbititspendsmostofitstimeineucalyptustrees桉树feedingonleavesthatarepoisonoustonearlyeveryotheranimalontheplanet. Thekoalasleepsabout22hoursadayandspendstheremainderofitstimeeatingandresting.Itmightspend10minutesadaymovingexpertssayusuallyfromonetreetoanother.Ithasasoftpadattheendofitsspineandextrathickfuronitsrearendtomaketheeffortofsittingmorecomfortable. ThreatsandprotectivemeasuresTheuniquelifestyleofthekoalahashelpeditprosperbuttodaythecuteandiconiccreatureisfacingthreatsfromhabitatlossdiseaseandachangingclimate. Koalapopulationsareexpectedtodeclineby50percentinthenext20yearsaccordingtotheAustralianMuseum. Tohelpprotecttheseanimalswhichbringinanestimated＄1.1billiontoAustraliaeachyearthroughkoala﹣relatedtourismaninternationalteamofresearchershaspublishedthefirstcompletegenome基因组ofthekoala. Theirhopeisthatthekeystothemarsupial's有袋动物long﹣termsurvivalmightbeplantedinitsgeneticcode. Theultimategoalisthatwewon'thaveto…rescuethemfromtheedgeofextinctionsaidRebeccaJohnsonoftheAustralianMuseumResearchInstituteinSydneywholedthework. Nowwehaveareallygoodunderstandingofthekoalagenomeandweareinafantasticpositiontousethatknowledgetohelpusmanagethem. Earlyfindings Anelementaryanalysisofthekoala'sgenomepublishedinNatureGeneticshasalreadyyieldedsomeinterestingfindings. Forexampletheauthorsfoundthatcomparedtoothermammalsthekoala'sDNAincludesanexpansioninthenumberofgenesthatencodeforenzymesinvolvedinanti﹣poison.Thatallowsthemtohaveadietthatdependsalmostentirelyoneucalyplusleaveswhichareunusuallyhighinpoison.Howeveritalsomeansthatkoalasmetabolize代谢medicineslikeanti﹣chlamydiaantibioticsfasterthanotheranimals. Thekoalagenomealsorevealedwhykoalasaresuchfamouslypickyeaters.Theyareknowntoconsumeleavesfromjust20ofAustralia's60knowneucalyplusspecies.Andevenwhentheyareinoneoftheirpreferredtreeskoalastakeleafselectionveryseriously. Informationwaitingtobediscovered Johnsonsaidthattheinformationencodedinthekoala'sDNAisalreadybeingincludedinmanagementstrategiesbyconservationgroups.Howevershesaidthefindingsdescribedinthenewpaperrepresenttheearlystagesofwhatcanbegleamedfromthemarsupial'sgenome. ThedataispublicandIwouldloveforanyonetostartminingitandseewhatotheramazingthingstheycanfindshesaid.Onceyouhaveagenomeofthisqualitythesky'sthelimitwithwhatyoucandowithit. 1Whatcanbeconcludedfromthepassage? A.TheresearchontheKoala'sDNAhaspreventeditsextinctionsuccessfully. B.ScientistsaretryingtorescueKoalasbyprovidingmoreeucalyptusleaves. C.Koala'sextinctionisbeingcontrolledeffectivelyinAustralia. D.ScientistsaretryingtofindawaybasedonKoala'sgenetosavethem. 2AccordingtothepassagewhichofthefollowingisTRUE? A.Koalascandigestpoisonousleavesthankstotheirgene. B.Koalasareparticularaboutleavesbecauseoftheirtaste. C.Koalasarebeingextinctjustduetohuman'sactivities. D.Koalaswillmovetoothercontinentsinordertosurvive. 3Thesky'sthelimitinthelastsentencemostprobablymeans. A.Theskyistherestriction B.Theskyistoohightoreach C.Thereisnolimit D.Thereisnopossibility 4Thepassageismainlyabout. A.Koala﹣aSpecialCreatureinAustralia B.scientificresearchonKoalas C.scientificeffortstosavetheKoalas D.Koala'sCharactersandPreference
Igraduatedin1941andofcoursegotcaughtinthewar.In1945Iwasouttwenty﹣oneyearsoldasoldierthrough35bombingmissionsandattheUniversityofWashingtontakingcreativewritingcoursessomethingI'dlookedforwardtoallthroughtheAirForce. I'dstartedwritingwhenIwasnineandwritingseemedtobetheonlythingI'deverbeableorwanttodo.MyteacherwasanewmannamedGrantRedfordaverygoodshortstorywritingteacherandasadman.HewasfromMontanaandhadbeenconnectedwiththeold.IthinkitbecamethebutI'mnotsureandIdon'tbothertolookitup.I'mafraidIwasnevermuchofastudentforRedford.Mystorieswerehopelesslyself﹣indulgent任性的onandonaboutmypersonalproblemswithoutformwithoutdevelopmentandwithoutevenanygoodwriting. HoweverIdidwritehumorinthosedaysandhadnotroublegettingitpublishedinthecampusmagazinethoughI'dhatetoseeitnow.Mostlymywritingwasusedtogetmyselfattentiontosatisfyaterriblepersonalinterestinself﹣admirationanditwasn'tuntilIconcentratedallmyeffortsonpoemsthatIwastorealizetheonlyrealrewardofwritingthatspecialwayyoufeeljustwhenyou'vedonesomethingyou like.That'sfarmoresatisfyingthanseeingyournameinprintgoodreviewspraiseorapplauseafterareading.Andmorelasting. 1Whatdoweknowabouttheauthor'schildhood? A.Agoodstudentofhisteacher. B.Crazyaboutwriting. C.Goodattellingshortstores. D.Longingtobeapilot. 2Howwashiswritingcareerattheearlystage? A.Productive. B.Successful. C.Struggling. D.Acompletefailure. 3Wheredidtheauthoreventuallyfindcomfortinwriting? A.Shortstories. B.Poems. C.Humorousstories. D.Goodreviews.
NowhereToHideWhatMachinesCanTellFromYourFace Thehumanfaceisaremarkablepieceofwork.1.Soistheface'sabilitytosendemotionalsignalswhetherthroughtheunconsciousshameorthetrickofafalsesmile.Peoplespendmuchoftheirwakinglivesintheofficeandthecourtroomaswellasthebarandthebedroomreadingfacesforsignsofattractionhostilitytrustanddeceit.Theyalsospendplentyoftimetryingtohidetheirfeelingsintentionsornature. 2.InAmericafacialrecognitionisusedbychurchestotrackworshippers'attendanceinBritainbyretailerstospotpastshoplifters.ThisyearWelshpoliceusedittoarrestasuspectoutsideafootballgame.InChinaitconfirmstheidentitiesofride﹣hailingdriverspermitstouriststoenterattractionsandletspeoplepayforthingswithasmile.Apple'snewiPhoneisexpectedtouseittounlockthehomescreen Setagainsthumanskillssuchapplicationsmightseemenhancive.Somebreakthroughssuchasflightortheinternetobviouslytransformhumanabilities.3.Althoughfacesarepeculiartoindividualstheyarealsopublicsotechnologydoesnotatfirstsightintrudeonsomethingthatisprivate.Andyettheabilitytorecordstoreandanalyseimagesoffacescheaplyquicklyandonavastscalepromisesonedaytobringaboutfundamentalchangestonotionsofprivacyfairnessandtrust. 4.Maskingtruefeelingshelpsfixthewheelsofdailylife.Ifyourpartnercanspoteveryprohibitedyawnandyourbosseveryhintofannoyancemarriagesandworkingrelationshipswillbemoretruthfulbutlessharmonious.Thebasisofsocialinteractionsmightchangetoofromasetofcommitmentsfoundedontrusttocalculationsofriskandrewardderivedfromtheinformationacomputerattachestosomeone'sface.Relationshipsmightbecomemorereasonablebutalsotransactional.
假如你是李华作为交流生在英国读书时住在Mrs.Brown家.现在刚回国不久打算给Mrs.Brown写封邮件内容包括 1.表示感谢 2.告知已寄送礼物 3.邀约她暑期游北京. 注意1.词数100左右.开头和结尾已给出.不计入总词数 2.可以适当增加细节以使行文连贯. DearMrs.Brown﹣﹣﹣﹣ Yours LiHua
ChinawillgreenlightInternetmedicalservicesconductedbymedicalinstitutionsaspartofabroaderpushtopromoteInternetPlusHealthcarethoseataStateCouncilexecutivemeetingchairedbyPremierLiKeqiangdecided. Medicalinstitutionswillbeallowedtoprovideonlinediagnosticservicesforsomecommonandchronicdiseasesinpatients'follow﹣upvisitstotheirdoctors.Thetoplevelsofhospitalswillbeencouragedtoprovideonlineservicesincludingconsultations会诊reservationsandtestresultinquiries. AsChinajoinstheranksofmiddle﹣incomecountriesthedemandforhealthserviceshasincreasedsubstantially.InternetPlusHealthcarecanhelpreducetheproblemofinaccessibleandexpensivepublichealthservicesthathavelongbeenabigconcernforthegeneralpublic. Onedecisioncomingoutofthemeetingsaystheintelligentreviewforhealthinsurancewillbeappliedandtheone﹣stopsettlementwillbeadvanced.Thereal﹣timesharingofprescriptionanddrugretailsaleswillbeexploredaswell. Wemustwastenotimeinpushingforwardthemeasuresoncethedecisionsmade.Lisaid.Inrecentyearstop﹣levelhospitalsinmajorcitieshaveseensteadyincreasesinthenumberofpatients.Medicalbillshavebecomeaheavyburdenonfamiliesandhigh﹣endmedicalresourcesstillfallshortofmeetingthegrowingdemandofthepublic. Tosolvetheproblematwo﹣pronged双管齐下的approachmustbetaken.Oneistoestablishmedicalpartnershipstostrengthencooperationbetweenmajorhospitalsandcommunityclinics.TheotheristobringforwardInternetPlusHealthcaretopromotethesharingofqualitymedicalresources. Thegovernmentwillseetoitthatlong﹣distancehealthcareservicescoverallcounty﹣levelhospitals.Somoreeffortswillbemadetoensurethathigh﹣speedbroadbandnetworkwillbeextendedtocovermedicalinstitutionsinurbanandruralareas.Dedicatedinternetaccessserviceswillbesetuptomeettheneedsforlong﹣distancehealthcareservices. 1Accordingtothetextwhichofthefollowingserviceswon'tapatientenjoyonline? A.Receivingamedicaloperation. B.Askingdoctorsforadviceafterthetest. C.Severaldoctorsdiscussionaboutthedisease. D.Makinganappointmentwithadoctorinadvance. 2WhyisthedemandforhealthservicesincreasinginChina? A.Theexpenseofmedicalcare. B.Therecognitionofhealthinsurance. C.Theimprovementofpeople'slifequality. D.Theinconvenienceofhospitalequipment. 3WhatdoesLimeanbysayingWemustwastenotimeinpushingforwardthemeasures? A.Thebillsareimpossibletoafford. B.Thesituationsareurgenttoimprove. C.Themeasuresareperfectlyworkedout D.Thehospitalsareunwillingtoadmitpatients. 4Whatcanbethesuitabletitleforthetext? A.ModernHospitals B.OnlineHealthcareonitsWay C.NoMoreBurdenforGeneralPeople D.WideApplicationsofInternetService
Whenwasthelasttimethatyoudialedaphonenumberfrommemory?Itprobablydependsonhowlongyou'vebeenusing1likeacellphone.Whilesomegenerationscanrecallthedaysofmemorizingphonenumbersit'spossiblethatmembersofGenerationZhaveneverhadtorememberasingle2.Whyisthis?Becausesmartphonesofferquickandconvenientwaysforstoringand3information.Thereisnoneedtomemorizeanything.Butthisisn'twithoutconsequence.Asdigitaldevicesdevelopmoreandmoreusers'heavyrelianceonthemmaybehavingdisablingeffects.Digitaldementia失智isthetermbeingusedbymedicalprofessionalstoidentifysomeoftheseeffects. SomeprofessionalslikeJimKwikanexpertinmemoryimprovementandoptimalbrainperformancearetakingacloserlookatthiseffect.Kwikdescribesdigitaldementialikethis…we're4ourbrainstooursmartdevices.We'resoreliantonoursmartphonesthatoursmartphonesaremakingusstupid.Asmedicalstudieschartthedeclineinmemoryandcognitiveskillsamongsmartphoneusersaconnectionismadebetweensymptoms5withdementia. Theseriousnessofoverusebecomes6whenyouconsiderjusthowyoungsmartphoneusersarebecoming.AuthorandspeakerSimonSinekpointsoutthatyoungmindsArenotreadyforit!Theirmindscannotcopewiththedopamine多巴胺.Consequentlytheoverstimulationofscreensandsoundsleadto7moreoftenthannot.Sonowparentsteachersandmanagersareaskinghowtohandletheinflux汇集ofyoungpeoplewiththiskindofaddiction. ●Firstmonitoryourcellphoneuse.KeepdownloadingapplicationslikeForestorChecky.Thencutbackonany8usage.Setaspecificgoalofhowmuchyouthinkyoushoulduseyourphone. ●Determine9areasforcellphoneuse.Forexamplewhileyou'reathomeonlyallowyourselftocheckyourphonesomewherelikeahomeoffice.Thiswaythetimeinbetweentasksisn't10filledwithstaringatyourscreen.
Angerisafeelingthatmanyofusknowalltoowell.Someofusexperienceitdaily1othersholdontoitforyearsatatime.Asyoulikelyknowangerisnotahealthy2.Overtimeitcanbecomeself﹣destructive3relationshipsandevenyourhealth. Thisisnottosaythatangerisalwaysa4thing﹣angerisanaturalpartoflivingitisa5thatsomethingiswrong.Ifangerisnota6normalandnaturalhumanemotionitis7importanttolearnandunderstandhowto8angertherightway. Youcanreleaseangertherightorthewrongway.9whetheryouhaveanangerproblemyourselfornotitis10foreveryonetounderstandwhattheright11ofreleasingangerare.Transformingangerisapowerful12totakethatwillcreatepositivechangesinourrelationships.Oneofthebestwaysto13angeristogiveyourselfthe14toexpressanger.Infactitisquitehealthytoexpressyourangeraslongasyoudoit15Rememberthatangermanagement16bothonmentalandphysicaleffort.Althoughmentaltherapyalonewillhelpyoutremendouslyforreleasingyourangeritcanonlytakeyousofar.Thesame17forexercisetoo.Howeverifyou18bothmentaltherapyandexercisingyouwillthenhave19toanunbelievablepositivesolution.Doaparticularphysicalactivity20thementalintentionofreleasingyouranger. 1A.when B.while C.but D.however 2A.life B.feeling C.happiness D.emotion 3A.reflecting B.ruining C.limiting D.satisfying 4A.bad B.good C.ordinary D.especial 5A.appearance B.mark C.signal D.gesture 6A.unbelievable B.completely C.incompletely D.carefully 7A.whatever B.how C.much D.however 8A.release B.relax C.absorb D.influence 9A.Insteadof B.Exceptfor C.Regardlessof D.Asaresultof 10A.important B.common C.hard D.easy 11A.answers B.messages C.ways D.actions 12A.step B.right C.attitude D.chance 13A.shift B.change C.move D.transform 14A.permission B.application C.affection D.admission 15A.confidently B.correctly C.gradually D.separately 16A.requires B.relies C.lacks D.decline 17A.arranges B.reaches C.prepares D.applies 18A.control B.join C.separate D.combine 19A.access B.approach C.admission D.contact 20A.inconflictwith B.ratherthan C.alongwith D.inplaceof
ImagineachildstandingonadivingboardfourfeethighandaskinghimselfthequestionShouldIjump?Thisiswhatmotivationorthelackofitcando.Motivationandgoalsettingarethetwosidesofthesamecoin.1.Likethechildonthedivingboardyouwillstayundecided. 2.Morethanthathowshouldyoustaymotivatedtoachievethegoal?Firstyouneedtoevaluateyourselfyourvaluesyourstrengthsyourweaknessesyourachievementsyourdesiresetc.Onlythenshouldyousetyourgoals. Youalsoneedtojudgethequalityanddepthofyourmotivation.Thisisquiteimportantbecauseitisdirectlyrelatedtoyourcommitment.Therearetimeswhenyourheartisnotinyourwork.3.Soslowdownandthinkwhatyoureallywanttodoatthatmoment.Clarity清晰ofthoughtscanhelpyoumoveforward. Anotherwayofsettingrealisticgoalsistoanalyzeyourshortandlongtermobjectiveskeepinginmindyourbeliefsvaluesandstrengths.Rememberthatgoalsareflexible.4.Theyalsoneedtobemeasurable.Youmustkeepthesepointsinmindwhilesettingyourgoals. Yourpersonalcircumstancesareequallyimportant.Forexampleyoumaywanttobeapilotbutcan'tbecomeonebecauseyoureyesightisnotgoodenough.5.Youshouldreassessyourgoalsandmotivateyourselftosetafreshgoal. Youwillsurelyneedtoovercomesomedifficultiessomeplannedbutmostunplanned.Youcannotovercomethemwithoutamplemotivation.Makesurethatyouplanforthesedifficultiesatthetimeofsettingyourgoals. A.Thiscanaffectyourwork. B.Sohowshouldyoumotivateyourself? C.Howeverthisshouldnotdiscourageyou. D.Sowhyshouldwetrytosetspecificgoals? E.Theycanchangeaccordingtocircumstances. F.Motivationiswhatyouneedmosttodoagoodjob. G.Withoutmotivationyoucanneithersetagoalnorreachit.
JustHowBuggyisYourPhone? Whatiteminyourhomecrawlswiththemostgerms?Ifyousay1toiletseatyou'rewrong.Kitchenspongestopthelist.Butcellphonesareprettydirtytoo.Theycontainaround10timesasmanygermsastoiletseats.Peopletouchtheirphoneslaptopsandotherdigitaldevicesalldaylongyetrarelycleanthem. Inoneincidentathiefpaidaterriblepriceforstealingagermycellphone.HestoleitfromahospitalinUgandaduringawidespreadofthedeadlydiseaseEbola.Thephone'sownerreportedthetheftbefore2diefromthedisease.Soonthethiefbeganshowingsymptomsandfinally3confesstothecrime. 4inthatunusualcaseacellphonecarrieddangerousbacterianotallgermsarebad.Mostcausenoharm.Infacttheycouldprovidehelpfulinformation.Lookatthesurfaceofyourphonecarefully.Doyouseesomedirtymars?That'sallyousaysmicrobialecologistJarradHampton﹣Marcell.That'sbiologicalinformation. Itturnsoutthatthetypesofgermsthatyouapplyalloveryourphoneortabletaredifferentfrom5ofyourfriendsandfamily.They'relikeafingerprintthatcouldidentifyyou.Somedayinthefutureinvestigatorsmayusethesemicrobialfingerprintstosolvecrimes.Phonesanddigitaldevicesmaybeoneofthebestplacestolookforbuggyclues. Ina2017studyresearcherssampledarangeofsurfacesin22participants'homes6countertopsandfloorstocomputerkeyboardsandmice.Thentheytriedtomatchthemicrobialfingerprintsoneachobjecttoitsowner.Theofficeequipmentwaseasiesttomatchtoitsowner.Inan7earlystudyadifferentgroupofresearchersfoundthattheycouldusemicrobialfingerprintstoidentifythepersonwho8useacomputerkeyboardevenafterthekeyboardsatuntouchedfortwoweeksatroomtemperature. Onedaymicrobialsignaturesmightshow9peoplehavegoneandwhattheyhavetouched.Theycouldprove10anunmarkeddeviceisyours.Sosureyourphoneisprettygermy.Doesthatinspireyouordoesitjustbotheryou?
Manypeopleprefereatingoutinsteadofcookingathome.Achangeappearstobetakingplacethoughandmillennialsareleadingtheway.AccordingtoonesurveymoreyoungpeoplearestartingtocookathomeforthreebasicreasonsTheycansavemoneyeathealthyandwastelessfood. PopularTVchefsarealsogettingmillennialsexcitedaboutlearningsomebasiccookingskills.Manymillennialsviewcookingasaformofentertainmentandself﹣expression.TheyproudlypostpicturesoftheircookingcreationsonFacebookorInstagramandinvitefriendsovertosharethecookingexperience. Manymillennialshavealsofoundwaystoavoidwastingfood.Afterroastingachickentheyputtheleftoverbonesintheirfreezerinsteadofthegarbagecan.Latertheyusethebonestomakechickenstockwhichisanimportantingredientinmanydishes. Theyalsohatethrowingoutfruitthat'stooold.Toavoidthatsituationtheybakeripefruitlikeberriesandbananasfor15minutesat175degreesC.Thentheyfreezeitovernight.Afterthattheyplacethefruitinplasticbagsandstoreittheirfreezerforlateruse. Nowanymillennialsonlyeatatrestaurantsthathaveexcellentfood﹣wastepolicies.Theseservantsuseeverypartofthevegetablestheybuyincludingtheirstemsandrootsindishes.Theyalsousebeefchickenandporkbonestomaketheirownstock. Millennialsalsoreducefoodwastebyonlybuyingwhattheyrequire.Beforegoingtoamarkettheywritedownwhattheyneedanddon'tbuyanythingelse.Theywaytheywon'tpurchasemorefoodthantheycanconsume. 1Whatisthemainsubjectofthisarticle? A.Acookingtrendthathasattractedmillennials. B.Aplanthatmillennialshavefordonatingfood. C.Anovelcookingtechniquethatmillennialslike. D.Afoodproductionsystemfavoredbymillennials. 2Whatdomillennialswithfruitbeforefreezingit? A.Mixitwithotheringredientsinabowl. B.Carefullyremovetheskinandseedsfromit. C.Useasharpknifetochopitupintopieces. D.Putitinanovenatthepropertemperature. 3Accordingtothisarticlewhendomillennialsmakecarefulchoices? A.Whentheydineouttogether B.Wheytheyvoteforcandidates C.Whentheychooseanemployer D.Whentheyplantanewgarden 4Accordingtothisarticlehowdomillennialsavoidpurchasingtoomuchfood? A.Theyselectsmallcansandpackages. B.Theyprepareapracticalshoppinglist. C.Theyleavetheircreditcardsathome. D.Theyweighproducebeforebuyingit.
Forthefirsttimein10yearstheUnitedStatesgovernmenthaschangeditsguidanceonhowmuchexercisepeopleneedtostayhealthyandwhentheyshouldstart. Forchildrenandteens Thenewguidancestatesthatthemostimportanttimeforchildrentobeginexercisingisbetweentheagesof3and5.1Thatcouldbelightactivitiesmoderateactivitiesorevenvigorous剧烈的activities. Doctorssayitisimportanttostartyoung.Theyaddthatfrombirthtoage5achild'sbraindevelopsmorethanatanyothertimeinlife.2Alsochildrenwhostartexercisingatayoungagearemorelikelytoestablishhealthybehaviorstheywillcontinueintoadulthood. Butthatdoesnotmeanputtingasmallkidonatreadmill跑步机orotherexerciseequipment.3Afterallit'sakid'snaturetoplayfreelyandhappily. 4Butitshouldn'tbelessthanonehouradaythreetimesaweek.Theiractivitiesshouldmostlybeaerobic有氧的exercisesuchasbikingswimmingorrunningwhichcanstrengthentheheartandlungs.Suchexerciseshouldalsoincludemuscle﹣and﹣bone﹣strengtheningactivitiessuchasclimbingtreesorplaygroundequipmentandplayingsports. Foradults Foradultstheguidelinesrecommendexercising150minutesaweek.Thatcouldbewalkinggardeningdancingetc.5Expertssaythatevenshortamountsofaerobicexercisecanprovidehealthbenefitssuchasloweringbloodpressurereducinganxietyandimprovingsleep. A.Anykindofactivitythatgetspeopleexercisingwilldo. B.Aerobicactivityworksonlyifitlastsforatleast10minutes. C.Simplygivingakidthetimeandspacetoplayactivelyisenough. D.Childrenabove5canhavearelativelyshortertimefordailyexercise. E.Childreninthisagerangerequireaboutthreehours'activeactivitiesdaily. F.Attainingthehealthbenefitsfromexercisemaybeharderthanearlierthought. G.Thesedevelopmentshavea1astingeffectonachild'sabilitytosucceedinlife.
Tasteissuchsubjectivematterthatwedonotusuallyconductpreferencetestsforfood.Themostyoucansayaboutanyone'spreferenceisthatit'soneperson'sopinion.Butbecausethetwobigcolacompanies﹣﹣﹣﹣Coca﹣ColaandPepsiColaaremarketedsoaggressivelywe'vewonderedhowbigaroletastepreferenceactuallyplaysinbrandloyalty.WesetupatastetestthatchallengedpeoplewhoidentifiedthemselvesaseitherCoca﹣ColaorPepsifansFindyourbrandinablindtasting. WeinvitedstaffvolunteerswhohadastronglikingforeitherCoca﹣ColaorPepsiDietCokeorDietPepsi.Thesewerepeoplewhothoughtthey'dhavenotroubletellingtheirbrandfromtheotherbrand. Weeventuallylocated19regularcoladrinkersand27dietcoladrinkers.Thenwefedthemfourunidentifiedsamplesofcolaoneatatimeregularcolasfortheonegroupdietversionsfortheother.WeaskedthemtotelluswhethereachsamplewasCokeorPepsithenweanalyzedtherecordsstatisticallytocomparetheparticipants'choiceswithwhatmereguess﹣workcouldhaveaccomplished. Gettingallfoursamplesrightwasatoughtestbutnottootoughwethoughtforpeoplewhobelievedtheycouldrecognizetheirbrand.Intheendonly7outof19regularcoladrinkerscorrectlyidentifiedtheirbrandofchoiceinallfourtrials.Thediet﹣coladrinkersdidalittleworse﹣only7to27identifiedallfoursamplescorrectly. Whilebothgroupsdidbetterthanchancewouldpredictnearlyhalftheparticipantsineachgroupmadethewrongchoicetwoormoretimes.Twopeoplegotallfoursampleswrong.Overallhalftheparticipantsdidaboutaswellonthelastroundtastingasonthefirstsotirednessortasteburnoutwasnotafactor.OurpreferencetestresultsuggeststhatonlyafewPepsiparticipantsandCokefansmayreallybeabletotelltheirfavoritebrandbytasteandprice. 1Accordingtothepassagethepreferencetestwasconductedinorderto. A.showthataperson'sopinionabouttasteismereguess﹣work B.showwhichcolaisthemorelikingofthedrinkers C.findouttheroletastepreferenceplaysinaperson'schoiceofdrinking D.comparetheabilityoftheparticipantsinchoosingtheirdrinks 2Itisimpliedinthefirstparagraphthat. A.thecompetitionbetweenthetwocolasisverystrong B.theimprovementofqualityisthechiefconcernofthetwocolacompanies C.thepurposeoftastetestsistopromotethesaleofcolas D.blindtastingisnecessaryforidentifyingfans 3Thestatisticsrecordedinthepreferencetestsshowthat. A.Coca﹣ColaandPepsiarepeople'stwofavoritedrinks B.fewpeoplehadtroubletellingCoca﹣ColafromPepsi C.people'stastesdifferfromoneanother D.thereisnotmuchdifferenceintastebetweenCoca﹣ColaandPepsi 4Theauthor'spurposeinwritingthispassageisto. A.arguethattastetestingisanimportantmarketingstrategy B.showthattastepreferenceishighlysubjective C.emphasizethattasteandpricearecloselyrelatedtoeachother D.recommendthatblindtastingbeintroducedinthequalitycontrolofcolas
已知点M21在椭圆C上AB是长轴的两个端点且．Ⅰ求椭圆C的标准方程Ⅱ已知点E10过点M21的直线l与椭圆的另一个交点为N若点E总在以MN为直径的圆内求直线l的斜率的取值范围．
假定你是校排球队队长李华.请写封邮件告知你的队友Chris球队近期将参加比赛内容包括 1.比赛信息 2.赛前准备 3.表达期待. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
DirectionsWriteanEnglishcompositionin120﹣150wordsaccordingtotheinstructionsgivenbelowinChinese. 假设你是明启中学高三学生卢平你的网友王磊近日就学习时如何记好笔记发邮件向你求教请给他回复一封电子邮件邮件必须包括以下内容 ●描述两到三个不同的笔记类型及其特征 ●如何记好笔记的建议 注意中文请不要出现真实的校名人名
热门题库
更多
高一下学期物理
高三下学期数学
高三上学期数学
高一下学期英语
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
湘公网安备 43130202000226号