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如图所示，三棱柱ABC﹣A1B1C1的侧棱垂直于底面，AC⊥BC，C1M＝CC1＝，A1N＝A1B1＝1． （1）求证；C1N∥平面A1BM； （2）若C1N⊥平面ABB1A1，求三棱柱ABC﹣...
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高二下学期数学《》真题及答案
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如图三棱柱ABC-A1B1C1的底面是边长为2的正三角形且侧棱垂直于底面侧棱长是 D是AC的中点
一个三棱柱的底面是边长为3的正三角形侧棱垂直于底面AA1＝3.求这个三棱柱的表面积和体积.
如图所示斜三棱柱ABC―A1B1C1的侧面A1ACCl与底面ABC垂直∠ABC=90°BC=2AC=
已知三棱柱ABC—A1B1C1的侧棱与底面边长都相等A1在底面ABC内的射影为△ABC的中心则AB1
A
B
C
D
如图在三棱柱ABC－A.1B.1C.1中侧棱垂直于底面∠ACB＝90°AC＝BC＝AA1D.是棱AA
侧棱垂直底面的三棱柱叫直三棱柱.已知直三棱柱ABC－A.1B.1C.1底面△ABC中CA＝CB＝1∠
.在三棱柱ABC﹣A.1B.1C.1中各棱长相等侧掕垂直于底面点D.是侧面BB1C.1C.的中心则A
在三棱柱ABC－
1
1
1
中，侧棱垂直于底面，∠ACB＝90°，∠BAC＝30°，BC＝1，且三棱柱ABC－A.
1
B.
1
C.
1
的体积为3，则三棱柱ABC－A.
1
B.
1
C.
1
的外接球的表面积为( ) A.16πB.12π C.8π
4π
在三棱柱ABCA1B1C1中各棱长相等侧棱垂直于底面点D.是侧面BB1C1C的中心则AD与平面BB
30°
45°
60°
90° 图K.433
已知三棱柱ABC﹣A′B′C′的底面为直角三角形两条直角边AC和BC的长分别为4和3侧棱AA′的长为
已知三棱柱ABC－A.1B.1C.1的底面是边长为的正三角形侧棱垂直于底面且该三棱柱的外接球的表面积
已知三棱柱ABC—A1B1C1的侧棱与底面边长都相等A1在底面ABC内的射影为△ABC的中心则AB
A
B
C
D
如图已知正三棱柱底面是正三角形且侧棱垂直于底面的三棱柱ABC﹣
1
1
1
的各条棱长都相等，M.是侧棱CC
1
的中点，则异面直线AB
1
和BM所成的角的大小是 A.90°B.60° C.45°
30°
已知三棱柱ABC﹣A.1B.1C.1中侧棱垂直于底面AC=BC点D.是AB的中点.Ⅰ求证BC1∥平面
已知三棱柱ABC—A1B1C1的侧棱与底面边长都相等A1在底面ABC内的射影为△ABC的中心则AB1
A
B
C
D
在三棱柱ABC—
1
1
1
中，各棱长相等，侧棱垂直于底面，点
是侧面BB
1
C.
1
C.的中心，则AD与平面BB
1
C.
1
C.夹角的大小是( ) A.30°B.45°C.60°D.90°
如图三棱柱ABC－A1B1C1中侧棱垂直底面∠ACB=90°AC=BC=AA1D.是棱AA1的中点1
在三棱柱ABC﹣A1B1C1中侧棱垂直于底面∠ACB=90°∠BAC=30°BC=1且三棱柱ABC﹣
如图水平放置的三棱柱的侧棱长和底面边长均为2且侧棱AA1⊥底面A1B1C1正视图是边长为2的正方形
A
B
C
D
如图三棱柱ABC－A1B1C1的底面是边长为2的正三角形且侧棱垂直于底面侧棱长是D.是AC的中点.Ⅰ
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I'daitifyoucouldgivemesomevaluableadviceonhowtolearnEnglishwell.
Anyexerciseisgoodexercisebutwhenitcomestolosingweightit'shardtobeatrunning.Afterallrunningisoneofthemostefficientwaystoburncaloriesandgetfitwithouthavingtorestrictyourdiet.1Ifyou'renotarunneryetbutinterestedinlosingweightherearefourreasonsrunningcanbethebestexerciseforweightloss. 2Whencomparingrunningwithwalkingthesamedistancestudiesfindthatrunningwillleadtogreaterweightlossmostlikelybecauseyourrestingenergyexpenditurestayselevated高的afteryourun.Inalong﹣termcomparisonstudyofrunnersandwalkerscaloriesburnedthroughrunningledto90%moreweightlossthancaloriesburnedthroughwalking. Runningistime﹣efficient.Evenifthemyththatrunningamileandwalkingamileburnthesamenumberofcaloriesweretruerunningisaconsiderablyfasterwaytoburnthosecalories.3 Runningisconvenient.Thoughmanyofushaveaccumulatedavastarsenal武器装备ofGPSgadgetsandtechteesovertheyearslittleisactuallyrequiredtogorunning.Youcandoitalone.Youcandoitalmostanywhere.4Forthisreasonalonerunningisthebestworkoutforweightlossbecauseit'scheapandaccessibleandtherearefewerbarrierstomaintainingaroutineevenwhiletraveling. Twowordsrunner'shigh.5Fortunatelystudiessupportwhatmanyrunnershaveexperiencedonananecdotallevel﹣runningcanactuallygetyouhigh.Scientistshavefoundlinksbetweenmoderatetointenseexerciseandmorphine﹣likebrainchemicalswhichexplainstheoccasionalfloodofthrillthatrushesoveryouduringahardrun.Thathappysensationyouhadafteryourlastracemakesyouwanttogoforanotherrunright? A.Cultivatethegoodhabitofrunning. B.Runningworksevenwhenyou'reatrest. C.Youwillneversticktoahabitifyoudon'tlikeit. D.Thefirstruleofexercisingforweightlossisthatifyoudon'tenjoyityouwon'tstickwithit. E.Youdon'tneedanyequipmentbeyondapairofrunningshoes. F.Ifyou'realreadyarunnerkeepon. G.Mostpeoplecanruntwoorthreetimesasfarastheycanwalkinagivenamountoftime.
假定你是李华你的外教老师Jack对中国传统文化很感兴趣想了解即将到来的中国的中秋节.请你写信向他介绍这个节日.内容包括 1.收到邮件的心情 2.简单介绍该节日 3.邀请他一起过节. 注意 1.词数80左右 2.可适当增加细节以使行文连贯.
Billisagpersonwhohasgivenmillionsofdollarstohelpthosepeopleinthedisaster﹣hitarea.
Placestoavoidtravelling IndiaThebigdifferenceinwealthandclassmayleadtosomeoftheriskofcrimesinthiscountry.ButaccordingtoJohnGobbelsachiefofficerforMEDJETaninternationalemergencyorganizationit'smedicalsafetythatactuallymakesIndiasodangerous.HeexplainsthattheU.S.StateDepartmentgivesthecountryLevel2traveladvisorystatusLevel1meansyoushouldexercisenormalprecautions预防措施Level4isdonotgo HawaiiConsideringthisdestinationisaveryhotspotforhoneymoonersitmightbesurprisingtoseetheBigIslandofHawaiiasadangerousplacetovisit.TheeruptionofavolcanohasputKilaueainastateofemergencywithpoisonousgaslavaflowsandearthquakesallarisk.You'lllikelyseespecialairlinedealscancelledsothinktwicebeforemakingthisflight. AcapulcoThisbeachresorttownonMexico'sPacificcoastisn'texactlythewhite﹣sandpartydestinationitoncewas.WithaLevel4traveladvisoryGobbelsexplainsit'sinthesamecategoryasplaceslikeIranSyriaandNorthKoreaIt'sregardedasthemurdercapitalofthecountry. CairoEgyptAccordingtoarecentreportfromtheThomsonReutersFoundationCairoisconsideredthemostunsafecityforwomenintheworld.EventhoughthepoliticaltensionsareeasinginthisareaaccordingtoGobbelssexualviolenceandculturalexpectationsmakeitextremelyproblematicforbothlocalsandvisitors. 1AccordingtoJohnGobbelswhichisdangerouswhiletravellinginIndia? A.Personalbelongings B.Travelinsurance. C.Medicalsafety. D.Culturaldifference. 2Whichplacementionedaboveisespeciallydangerousforawomantourist? A.Cairo. B.India. C.Acapulco. D.Hawaii 3Whatcanbeinferredfromthetext? A.ALevel3traveladvisoryindicatesyoucangowithnormalprecautions B.Syriaisn'tariskydestinationwhereyou'llhaveawonderfulvacation. C.TheflightstoHawaiimaybechangeableduetotheeruptionofthevolcano D.ThepoliticaldisorderinCairoisresponsibleforitsunsafetyatpresent.
When1learntodrivewearetoldtoobeythetrafficrulesandnottodriveourvehiclestoofast.2surprisesusisthatsomeyoungpeoplejustenjoythefeelingofdrivingcarsormotorcyclesataveryhighspeed.Jack318﹣year﹣oldboyis4exception. RecentlyJack'sfatherhasboughthimacar5isquiteadmiredbyhisfriends.Whenheisoutinthecountrywherethereareafewpeopledrivingandthetrafficrulesarenotstrictthis6adventureboywilldrive7extremefast.IntownshoweverthereisaspeedlimitthatisfiftykilometersanhourbutJackoftendrivesmuchfaster. OnedayJackwasdrivingthroughtownswhenayoungpolicemanwhowasnewtohiswork8stophimandsaidI'mafraidyouweredrivingatamorethanfiftykilometersanhourSir.Pleasegivemeyournameandaddress.9lookatthepolicemancarefullyJacksaidtohimWellsirIstartedmyjourneylessthananhourago.Onhearingthishedidn'tknowtheanswer10Jack'sexcuse.HethoughtforafewsecondsandthenletJackgo.
Theminutetheshoppingmallopenedtheccamecrowdingin.
Shespendsalotofmoney款待herfriends.
2018年7月12日我国科学家姜雪峰教授被评为”全球青年化学家元素周期表硫元素代言人”其是目前为止第一位人选的中国学者．下列说法或推测正确的是
Childrenshouldbewarnedthatfruitjuicescanbehtotheirteeth.
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WesentNancyourconherwinningthegoldmedalinthe1500metersrace.
China'sTeaVillages InmostChineseteavillagesMarchisthetimeofyear1localsstarttopickandprocesstea.Theusuallyquietvillagessuddenlybecomebusycentersofactivityaspeopletakeoutspecialtoolsandprepare2teaprocessing.Insomevillageslocalresidentsholdtraditionalceremonies3thankheavenforitsblessing.Thepriceoftea4pickinMarchisextremelyhighbecause5isfreshtenderandcontainsmultipletraceelements. China6befamousforteaproductionsinceancienttimes.Ofthegoodstransportedandtradedalong7OldSilkRoadlinkingChinatotheMiddleEastandEuropetheimportanceofteawasmatchedonlybysilk.ChinaproducesOolongblackgreenwhiteyellow8darkakapost﹣fermentedtea.TheOolonggreenandblack9varyaremostnotablefortheirhighquality. MostofChina'steavillagesarefoundinremotemountainousareasinthecountry'ssouthandsouthwest10thebeautifulsceneryisoftenhiddenunderclouds.
有很多工作要做他不被允许出去. Withhewasnotallowedtogoout.
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随着人们生活水平的提高广场舞大妈们掀起了一场广场舞热潮.针对这一现象不同的人有不同的观点请你以广场舞squaredancing为主题完成一篇文章 内容要点 1优点一种健康的生活方式保持健康和活力结交朋友消除孤独 2问题噪音污染抢占地盘引发争执 3你的看法.
AhospitalhasbeenforcedtobanPokemonGoplayersfromthesiteafteramonsterhub妖怪枢纽站wasfoundintheA&Edepartment.RoyalStokeUniversityHospitaldiscoveredthatitscasualtyunit急诊室isonthesamespotasaPokemonGo‘gym'﹣whereplayerscantraintheirnewlycaughtNintendocreatures. TheUniversityHospitalsofNorthMidlandsTrustagreedlastweekthatpatientscanplayPokemonGoonwardsbecausewalkingaroundishealthy.ButtheTrusthasbeenforcedtopostawarningonitswebsiteaboutpublicaccesstoA&E.ItsaidifPokemonGobecomesamajorannoyanceitwouldaskNintendo﹣whichdecidesonthelocationsofthevirtualgymsaccordingusingGPS﹣tohaveitremovedfromthepremises道馆. KevinParkerassociatechiefnursesaidMembersofthepublicwhodonotneedtobeatRoyalStokeshouldnotattempttoenterA&Eoranyotherpartofthehospitalbuildingtoplaythegame.TheA&Edepartmentisincrediblybusythissummer.Wewantthepublictounderstandthatanybodywhovisitsthehospitalsolelytoplaythegamewillprovideanunwanteddistractiontotheimportantworkofthehospital.I'malsoawareofvariousreportsinthemediaofunsafeareasthatthegamehasbeenplayedin. RoyalStokeUniversityHospitalisasafeareawheregamerscanenjoyPokemonGo.MichelleHarristheTrust'smanagersaidthegamecouldstillbeplayedbythosealreadyinhospital.WerecognisethatthePokemonGogameencourageswalkingandexercisewhichissomethingthattheTrustisequallykeentopromoteshesaid. ThereareanumberofwalkingroutesestablishedthroughouttheTrustthatcanbeusedtocombinewalkingandplayingthegame.Walkingjust30minutesfivetimesaweekcanhelpreducetheriskofpreventableillnessessuchasobesitydiabetesandheartdisease. TherehavebeenseveralwarningsaboutthegamesinceitsUKrelease.LastweekagroupofteenagersinWiltshirewereleftstrandedalmost100ftundergroundaftertheygotcarriedawaysearchingforPokemonGocharacters.Thefourboysaged16and17endedupgettinglostandhadtowaittogetaphonesignalbeforetheycouldcallforhelp.EventuallytheycontactedDorsetandWiltshireFireandRescueteamwhotookthemtosafety.DamienBenceofthefireandrescueteamsaidPokemonGoisobviouslyleadingpeopleintodangeroussituations. 1ItseemsthatPokemonGoisagame. A.designedtohelppatientshaveaquickrecoveryinhospital B.helpingcuresuchdiseasesasobesitydiabetesandheartdisease C.encouragingplayerstowalkandexerciseinsteadofstayingindoors D.warningteenagersoftheplaceseasytogetlostorattacked 2TheA&Edepartmentisincrediblybusybecause. A.morepatients'arrivalincreasestheworkloadoftheA&Edepartment B.doctors'playingthegamemakestheA&Edepartmentlessefficient C.players'injuryincreasestheworkloadoftheA&Edepartment D.players'arrivaldisturbstheworkoftheA&Edepartment 3Theunderlinedwordinthelastparagraphprobablymeans. A.hurt B.disturbed C.trapped D.threatened 4Thepassageismainlyabout. A.thenegativeeffectsofPokemonGosinceitsUKrelease B.theapplicationsofPokemonGoinhospitalssinceitsUKrelease C.thepopularityofPokemonGosinceitsUKrelease D.theestablishmentofPokemonGovirtualgymssinceitsUKrelease
只有在老师进入教室时学生们才停止大声说话. Onlywhentheteacherenteredtheclassroom.
Igrewupwithoutafather.Wellsortof.Myparentsdivorced离婚inthe1960﹩whenIwasasmallchildandIstayedwithmymotherinLosAngeles.MyfatherremarriedandmovedtoasmallsuburbofAtlanta.ForonemonthoutoftheyearinthesummerIwouldflybackandspendtimewithmydadsoIhadafatherattimes. FurtherIhadaseriesofstepfatherswhorangedfromwonderfulguystoalcoholicstodangerousindividuals.HavinglivedthroughsuchexperiencesIfinditamusingwhenpeoplesaythatchildrenreallyneedafatherinthehome.WellifheisagoodfatherandagoodmanthenIagreecompletely.Ifheisnotthenthechildmightactuallybebetteroffwithouthim.Wedon'tjustneedfathers﹣weneedgoodfathers. IfeelitfairtosayIendedupaverysuccessfuladultatleastthat'swhatpeopletellme.SohowdidIdoit?Ithinkitstartedwithmehavingabitofachiponmyshoulder.Normallythisisnotagoodthingbutinmycaseitwasrocketfuelforachievement.Nothavingafatherinmylifegavemesomethingtoproveanditmotivated激励meinanI'llshowyouway. Ialsotriedveryhardevenasalittleboytobeself﹣sufficient.AndthatmeansIdidnotrelyuponmyparentsexcepttotheextentnecessary.ThiskindofindependenceIbelieveishighlymissedinthisageofhighlymanagedchildrenwithhelicopterparentshovering盘旋abovethemconstantly. IalsothinkIneverwantednothavingafatherinmylifetobeanexcuseformyself.WemakeandallowexcusesconstantlythesedaysbutIjustneverfeltthatfeelingsorryformyselfwasgoingtogetmeanywhereIthinkifchildrencanadoptsuchmindsetsearlyintheirlivesitcanbehelpful. 1Accordingtothefirsttwoparagraphstheauthorthinks. A.hisfatherisabadone B.nobodyneedsafather C.childrenneedagoodfather D.childrenreallyneedafather 2Howdidtheauthorendupaverysuccessfuladult? A.Hewasveryintelligent B.Hemadeexcuseforhimself C.Hewasmotivatedbyafather D.Hewasveryindependentandtriedveryhard 3Whatdoestheunderlinedwordself﹣sufficientmeaninparagraph4? A.Abletodependonmyself. B.Abletodressmyselfveryquickly. C.Abletoplaybymyself. D.Abletoworkonmyown. 4Howcanwedescribetheauthorfromthepassage? A.Friendlycleverandwarm﹣hearted. B.Cleverdeterminedandindependent. C.Motivatedhard﹣workingandindependent. D.Motivatedhard﹣workingandwarm﹣hearted.
Atthemeetingthechairmanrtotheaccidenthappenedlastyear.
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NA表示阿伏加德罗常数的值．俗名为“臭碱”的硫化钠广泛应用于治金染料皮革电镀等工业．硫化钠的一种制备方法是Na2SO4+2CNa2S+2CO2↑．下列有关说法正确的是
ItwasalongtimesinceIhadseenmyparentslasttime.LastSaturdayIdrovealongwaytovisitthem1neitherofthemwasathome.SoIwaitedpatientlyattheirhome2theirreturn.Notseeingthemmademereally3. AsIwaswalkingaroundtheirbedroomI4littleremindersofthem.SomeChristmasgiftswerestill5inboxes.Therewere6onthewallwhichIguessmusthavea7meaningtothem.Whattookmybreathawaywasseeingmydad'semblems徽章fromhismilitarysereofourcountry8hewasyoung.Myfathernever9tousabouttheKoreanWars.AsIlookedatthoseemblemshanging10withallthephotosthathetreasuresI11thatthiswasanimportantpartofhislifebutIneverspent12intalkingwithhimaboutthem.Thephotosofmymomwithherclose13mademerealizeherlifebeforeshewasmymom.Ihadbeenso14runningmybusinesstoraisemyownfamilythatI15thechancetoknowabouttheirpastandexperience. Wesometimesdon'trealizesomethingis16forusuntilwehavelostitsoit'snottoolateforustotalktoourparentsabouttheirpast.Iamwritingmystoryto17everyonewhoisfortunatetostillhavetheirparents18toinvestsometimetolearnaboutthem.Iamgratefultohave19ofmyparents.SoIstillhavetimetotalkwiththem.Ihopethatreaderswill20frommystoryandfindthetimetotalkaboutthosethingsintheirlifethatmeansomuchtotheirparents. 1A.and B.or C.but D.so 2A.to B.for C.of D.in 3A.frightened B.embarrassed C.excited D.upset 4A.sought B.saw C.needed D.took 5A.covered B.folded C.hidden D.kept 6A.SantaClaus B.familyphotos C.familytrees D.oldclothes 7A.simple B.special C.past D.real 8A.if B.until C.though D.when 9A.showed B.explained C.talked D.referred 10A.finally B.clearly C.openly D.proudly 11A.realized B.declared C.admitted D.promised 12A.courage B.chance C.time D.energy 13A.students B.teachers C.friends D.children 14A.strict B.eager C.blind D.busy 15A.rejected B.missed C.delayed D.avoided 16A.hopeful B.original C.careful D.important 17A.warn B.demand C.require D.encourage 18A.away B.around C.awake D.alone 19A.both B.neither C.either D.one 20A.make B.change C.benefit D.Recover
OxfordandCambridgehavenowdecidedtoremovethewordsCAN'TandIMPOSSIBLEfromtheirdictionary.JessicaCoxbornin1983inArizonaistheworld'sfirstlicensedarmlesspilot. ThegirlfromTucsonArizonagottheSportPilotcertificatelatelyandbecamethefirstpilotlicensedtoflyusingonlyherfeet.JessicaCoxwasbornwithoutarmsbutthathasonlystoppedherfromdoingonethingusingthewordcan't. CoxgraduatedfromtheUniversityofArizonain2005withabachelor'sdegreeinpsychologyandaminorincommunications.Coxhasnotusedprostheticarmssincesheturned14.Usingherfeetasmostpeopleusetheirhandssheisableamongotherthingstodriveanunmodifiedcarwithanunrestrictedlicensetotypeonakeyboardat25wordsperminuteandtoputinandremovehercontactlenses. JessicaCoxflewinasingleengineairplaneforthefirsttimeviaWrightFlightin2005.Coxearnedherpilot'scertificateonOctober102008afterthreeyearsoftrainingandisqualifiedtoflyalight﹣sportaircrafttoaltitudeof10000feet. She'sagoodpilot.She'srocksolidsaidParrishTraweek42theflyinginstructoratSanManuel'sRayBlairAirport.ParrishTraweekrunsPCAircraftMaintenanceandFlightServicesandhastrainedmanypilotssomeofwhomdidn'tcomeclosetoCox'sabilities. Doctorsneverlearnedwhyshewasbornwithoutarmsbutshefiguredoutearlythatshedidn'twanttouseprostheticdevices.SothenexttimeyouarereadytotellyourselfIcan'tpossibly…rememberthisamazingyoungwomanandchangeyourvocabulary. 1Whatcanwelearnfromthefirstparagraphs? A.OxfordandCambridgefeltalittledisappointed. B.Noarmlesspeoplehadgotapilotcertificatebefore. C.JessicaCoxwasn'tallowedtousethewordcan't. D.Thewordcan'twoulddisappearfromtheEnglishdictionary. 2WhatdoyouthinkofJessicaCox? A.Sheisacleverandbravegirl. B.Sheispositiveanddetermined. C.Sheisindeedapoorlyeducatedgirl. D.Sheonlytakesinterestinaircraft. 3WhatdoestheunderlinedwordprostheticmeaninParagraph3? A.artificial B.damaged C.unusual D.abnormal 4AftergraduatingfromuniversityJessicaCox. A.sufferedfailurewhensearchingforjobs. B.madeastarttotaketrainingtobecomeapilot C.decidedtouseherfeetasmostpeopleusehands. D.triedherbesttotakecareofherselfinherdailylife.
Doyouusuallyfeelyou'reworkinghardbutstillcan'treachyourstudygoals?Herearesomequicktipstohelpyoustudybetter. ♦Studywithapartneroringroups Ratherthanlivinginacavewithyournoseinthebooksalldaygrabafriendfromyourclassandstudywithhim.1 ♦Stepintoyourteacher'sshoes AskyourselfIfIweretheteacherwhatwouldIputonthetest?Youhaveprobablyexperiencedalotofyourteacher'stestsandquizzesbynow.2Teachershavespecifictypesofinformationthattheywantyoutolearn.Thestructureisusuallythesame. ♦Paintpicturesonthepaper Youcanbuildyourknowledgestructureintheformofpictures.It'shardertoremembereachpieceofapuzzleindividuallythanitistorecallthecompletedpicture.3 ♦4 Ahungrybrainisanineffectiveone.Yourbrainneedsthepropernutrientstokeepitgoing.Becauseofthiswhatyoueatanddrinkalsoplaysahugeroleinhowsharpyourbrainis.Healthyfoodsprovidenutrientstoyourbraincellstokeepthemenergized. ♦Takebreakstorelaxyourbrain Yourbrainislikeamuscle.Itcanbealsotiredifyouoverworkit5Ifyoudividestudyinginto15to30minutesblockswithquickbreaksinbetweenyourbrainwillfeelrefreshedgratefulandreadyforthenextchallengeyouthrowat. A.Feedyourbrainfromtimetotime. B.Itneedsexercisetomakeitstronger. C.Relaxyourbrainbyeatinganddrinking. D.You'dbetterlearnfromthemforthenexttest. E.It'snecessarytohavealongholidayandhavenicefood. F.Findwaystoconnectwhatyouarelearningtoreallifeortootherconcepts. G.Groupstudyinghelpsyoutoengageandprocesstheinformationmoredeeply.
LearningEnglishwellishardworkbutifyouworkhardatityouwillsintheend.
ItisgoodmforanArabtostandclosetohisfriendswhentheyaretalking.
Bytheageoftwoachildwillhaveavofabouttwohundredwords.
AccordingtonewresearchfromtheUniversityofCambridgeinEnglandsheepareabletorecognizehumanfacesfromphotographs. Thefarmanimalswhoaresocialandhavelargebrainswerepreviouslyknowntobeabletorecognizeoneanotheraswellasfamiliarhumans.Howevertheirabilitytorecognizehumanfacesfromphotosaloneisnovel. TherecentstudytheresultsofwhichwerepublishedinthejournalRoyalSocietyOpenScience.ShowthewoollycreaturescouldbetrainedtorecognizestillimagesofhumanfacesincludingthoseofformerPresidentBarackObamaandactressEmmaWatson. Initially最初thesheepweretrainedtoapproachcertainimagesbybeinggivenfoodrewards.Latertheywereabletorecognizetheimageforwhichtheyhadbeenrewarded.Thesheepcouldevenrecognizeimagesoffacesshownatananglethoughtheirabilitytodosodeclinedbyabout15percent﹣thesamerateatwhichahuman'sabilitytoperformthesametaskdeclines. AnyonewhohasspenttimeworkingwithsheepwillknowthattheyareintelligentindividualanimalswhoareabletorecognizetheirhandlerssaidProfessorJennyMortonwholedtheCambridgestudy.We'veshownwithourstudythatsheephaveadvancedface﹣recognitionabilitiescomparablewiththoseofhumansandmonkeys. RecognizingfacesisoneofthemostimportantsocialskillsforhumanbeingandsomedisordersofthebrainincludingHuntington'sdiseaseaffectthisability. Sheeparelong﹣livedandhavebrainsthataresimilarinsizeandcomplexitytothoseofsomemonkeys.ThatmeanstheycanbeusefulmodelstohelpusunderstanddisordersofthebrainsuchasHuntington'sdiseasethatdevelopoveralongtimeandaffectcognitiveabilities.OurstudygivesusanotherwaytomonitorhowtheseabilitieschangeMortonsaid. 1Accordingtothenewresearchwhat'sunusualaboutsheep? A.Theyhavelargebrains. B.Theycanrecognizetheirowners. C.Theycantellanimalsfromhumans. D.Theycanrecognizehumanfacesfromphotograph. 2Howdidtheresearcherstrainthesheep? A.Byguidingthemtofollowtheirhandlers. B.Byshowingphotosofhumansandmonkeysbyturns. C.Bygivingfoodrewards. D.Byshowingphotosoffamouspeople. 3Whatcanbeinferredfromthepassage? A.Sheephaveahigherface﹣recognitionabilitythanmonkeys. B.Thenewdiscoveryisbeneficialtothestudyofcognitiveabilitychanges. C.Thesheep'sface﹣recognitionabilitysaysthesamewhenshownphotosatanyangle. D.Thesheep'sface﹣recognitionabilitymaypreventsomedisordersofthebrain. 4What'sthebesttitleofthepassage? A.ANewdiscoveryaboutSheep. B.HowSheepRecognizeEachOther. C.AWonderfulScientist. D.TheLifeofSheep.
假设你是李华你的英国网友Jack正在学习汉语他在信中询问你如何提高汉语写作能力.请你用英语给他写封信就如何提高写作能力给他提些建议. 内容要点如下 1.多读别人的文章Chinesearticles 2.多写多练 3.不要害怕出错. 4.其他 注意1.词数100左右2.可适当增加细节以使行文连贯.
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