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已知函数f(x)=x3+ax2+bx+c的图象关于点(0,2)对称,曲线y=f(x)在点(1,f(1))处的切线过点(2,7),设曲线y=f(x)在x=0处的切线的倾斜角为α,则sin(3π+α)•...
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高二下学期数学《》真题及答案
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已知函数fx=ax3-2x的图象过点-14则实数a=.
已知函数fx=2x+1则
f(x)的图象经过点(0,1)
f(x)在R.上的增函数
f(x)的图象关于y轴对称
f(x)的值域是(0,+∞)
已知函数fx=ax2+ax和gx=x-a其中a∈R.且a≠0.若函数fx与gx的图象的一个公共点恰好
已知函数fx=﹣x3+ax2+bx+c图象上的点P1f1处的切线方程为y=﹣3x+1函数gx=fx﹣
已知函数fx=asinx-bcosxab为常数a≠0x∈R.的图象关于直线x=对称则函数y=f是
偶函数且它的图象关于点(π,0)对称
偶函数且它的图象关于点
对称
奇函数且它的图象关于点
对称
奇函数且它的图象关于点(π,0)对称
如图已知函数y=3x+b和y=ax﹣3的图象交于点P.﹣2﹣5则根据图象可得不等式ax﹣3<3x+b
已知函数fx=x2+ax+b的图象关于直线x=1对称.1求实数a的值2若fx的图象过20点求x∈[0
已知函数y=ax2﹣2ax﹣1a是常数a≠0下列结论正确的是
当a=1时,函数图象经过点(﹣1,1)
当a=﹣2时,函数图象与x轴没有交点
若a<0,函数图象的顶点始终在x轴的下方
若a>0,则当x≥1时,y随x的增大而增大
已知命题p函数y=logaax+2aa>0且a≠1的图象必过定点-11命题q如果函数y=fx-3的图
“p∧q”为真
“p∨q”为假
p真q假
p假q真
已知命题p函数y=logaax+2aa>0且a≠1的图象必过定点-11命题q如果函数y=fx-3的图
“p且q”为真
“p或q”为假
p真q假
p假q真
已知函数fx=x3+bx2+ax+d的图象过点P02且在点M﹣1f﹣1处的切线方程为6x﹣y+7=0
已知二次函数fx=axx﹣1a≠0且其图象的顶点恰好在函数y=log2x的图象上.1求函数fx的解析
已知函数fx=x2ax+bab∈R.在x=2时有极值其图象在点1f1处的切线与直线3x+y=0平行则
(-∞,0)
(0,2)
(2,+∞)
(-∞,+∞)
已知函数fx=x2+ax﹣2a﹣3exⅠ若x=2是函数fx的一个极值点求实数a的值Ⅱ设a<0当x∈[
已知函数fx=ax3+bx2+cabc∈Ra≠0.1若函数y=fx的图象经过点00-10求函数y=f
已知函数fx=x3+ax+1的图象在点1f1处的切线过点27则a=
﹣1
1
2
3
已知函数fx=x3+bx2+ax+d的图象过点P.02且在点M.-1f-1处的切线方程为6x-y+7
已知函数fx=ax3+bx2+cx在点x0处取得极大值5其导函数y=f′x的图象经过1020点如图所
若函数fx对定义域中任意x均满足fx+f2a﹣x=2b则函数fx的图象关于点ab对称.1已知函数fx
对于三次函数fx=ax3+bx2+cx+da≠0定义f″x是函数y=fx的导函数y=f'x的导函数.
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氯化钠NaCN是一种基本化工原料同时也是一种毒物质.一旦泄漏需要及时处理一般可以通过喷酒双氧水或过硫酸钠Na2S2溶液来处理以轻其对环境的污染. Ⅰ.1NaCN用双氧水处理后产生一种酸式盐和一种能使湿润的红色石蕊试纸变蓝的气体该反应的化学方程式是. Ⅱ.工业制备过硫酸钠的反应原理如下所示 主反应NH42S2O8+2NaOHNa2S2O8+2NH3↑+2H2O 副反应2NH3+3Na2S2O8+6NaOH6Na2SO4+N2+6H2O 某化学小组利用上述原理在实验室制备过硫酸并用过硫酸钠溶液处理含__的废水. 实验一实验室通过如图所示装置制备Na2S2O8. 2装置中盛放NH42S2O8溶液的仪器的名称是. 3装置a中反应产生的气体需要持续通入装置c的原因是. 4上述装置中还需补充的实验仪器或装置有填字母代号. A.温度计B水浴加热装置C.洗气瓶D.环形玻璃搅拌棒 实验二測定用过硫酸钠溶液处理后的废水中氯化钠的含量. 已知①废水中氯化钠的最高排放标准为0.50mg/L. ②Ag++2CN﹣═[AgCN2]﹣Ag++I﹣═AgI↓AgI呈黄色CN﹣优先与Ag+发生反应.实验如下取1L处理后的NaCN废水浓缩为10.00mL置于锥形瓶中并滴加几滴KI溶液作指示剂用1.0×10﹣3mol/L的标准AgNO3溶液滴定消耗AgNO3溶液的体积为5.00mL 5滴定终点的现象是. 6处理后的废水中__的浓度为mg/L. Ⅲ.7常温下含硫微粒的主要存在形式受pH的影响.利用电化学原理用惰性电极电解饱和NaHSO4溶液也可以制备过硫酸钠.已知在阳极放电的离子主要为HSO4﹣则阳极主要的反应式为.
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.
如图所示ab间接入u=200sin100πtV的交流电源理想变压器的原副线圈匝数比为21Rt为热敏电阻且在此时的环境温度下Rt=2Ω温度升高时其电阻减小忽略保险丝L的电阻电路中电表均为理想电表电路正常工作则
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
如图所示在OA和OC两射线间存在着匀强磁场∠AOC为30°正负电子质量电荷量大小相同电性相反以相同的速度均从M点以垂直于OA的方向垂直射入匀强磁场下列说法可能正确的是
如图甲所示足够长的传送带与水平面夹角为θ传送带以速度v0逆时针匀速转动.在传送带的上端轻轻放置一个质量为m的小木块小木块与传送带间的动摩擦因数μ.图乙为小木块运动的速度一时间图象.根据以上信息可以判断出
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.
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.
只有在老师进入教室时学生们才停止大声说话. Onlywhentheteacherenteredtheclassroom.
中科院大连化学物理研究所的一项最新成果实现了甲烷高效生产乙烯如图所示甲烷在催化作用下脱氢在不同温度下分别形成•CH3在气相中经自由基CH2偶联反应生成乙烯该反应过程可逆 1已知相关物质的燃烧热如表所示写出甲烷制备乙烯的热化学方程式. 2现代石油化工采用Ag作催化剂可实现乙烯与氧气制备X分子式为C2H4O不含双键 该反应符合最理想的原子经济则反应产物是填结构简式. 3在400℃时向初始体积为1L.的恒压密闭反应器中充入1molCH4发生1中反应测得平衡混合气体中C2H4的体积分数为20.0%.则 ①在该温度下其平衡常数K=. ②若向该反应器中通入高温水蒸气不参加反应高于400℃则C2H4的产率将填“増大”“减小”“不变”或“无法确定”理由是. ③若反应器的体积固定不同压强下可得变化如图所示则压强的关系是. ④实际制备C2H4时通常存在副反应2CH4g⇌C2H6g+H2g. 反应器和CH4起始量不変不同温度下C2H6和C2H4的体积分数与温度的关系曲线如图所示. Ⅰ.在温度高于600℃时有可能得到一种较多的双碳有机副产物的名称是. Ⅱ.若在400℃时C2H4C2H6的体积分数分别为20.0%6.0%其余为CH4和H2则体系中CH4的体积分数是.
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.
他终于使自己摆脱了所有的财政忧虑. Hefinallyhimselfallfinancialworries.
科学家发现对冶金硅进行电解精炼提纯可降低高纯硅制备成本.相关电解槽装置如图1所示用Cu﹣Si合金作硅源在950℃下利用三层液熔盐进行电解精炼并利用某CH4燃料电池如图2所示作为电源.下列有关说法不正确的是
如图所示真空中三个质量相等的小球ABC带电量分另为QA=6qQB=3qQC=8q.现用恰当大小的恒力F拉C可使ABC沿光滑水平面做匀加速直线运动运动过程中ABC保持相对静止且AB间距离与BC间距离相等.不计电荷运动产生磁场的影响小球可视为点电荷则此过程中BC之间的作用力大小为
蜂胶是一种天然抗癌药主要活性成分为咖啡酸苯乙酯Ⅰ.合成化合物Ⅰ的路线如图所示 已知① ②RCHO+HOOCCH2COOHRCH=CHCOOH 请回答下列问题 1化合物A的名称是化合物Ⅰ中官能团的名称是. 2G→H的反应类型是D的结构简式是. 3写出化合物C与新制CuOH2悬浊液反应的化学方程式. 4化合物W与E互为同分异构体两者所含官能团种类和数目完全相同且苯环上只有3个取代基则W可能的结构有不考虑顺反异构种其中核磁共振氢谱显示有6种不同化学环境的氢峰面积比为2121111写出符合要求的W的结构简式. 5参照上述合成路线设计由CH3CH﹣CH2和HOOCCH2COOH为原料制备CH2CH2CH=CHCOOH的合成路线无机试剂及吡啶任选. .
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.
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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