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设a=lg5，b=log42，c=（）1.1，则（ ）
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高二下学期数学《》真题及答案
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某同学根据机械能守恒定律设计实验探究弹簧的弹性势能与压缩量的关系.①如图23a将轻质弹簧下端固定于铁
图6是物体做直线运动的v-t图象由图可知该物体
第1 s内和第3 s内的运动方向相反
第3 s内和第4 s内的加速度相同
第1 s内和第4s内的位移大小不等
0~2s内和0~4s内的平均速度大小相等
设则=______
设常数a＞0则=______．
设=______．
设连续函数fx满足则fx=______．
设满足则的最大值为.
设可对角化则abc的取值为______．
设向量的夹角为θ其中0＜θ≤π||=1||=2若2﹣⊥k+则实数k的值为.
设函数在-∞+∞内连续则c=______．
如图7所示水平地面上堆放着原木关于原木P.在支撑点M.N.处受力的方向下列说法正确的是
M.处受到的支持力竖直向上
N.处受到的支持力竖直向上
M.处受到的摩擦力沿MN方向
N.处受到的摩擦力沿水平方向
设0
ab
2<1
<(
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a
<(
)
b
a
2
log
b
a<0
用密封性好充满气体的塑料袋包裹易碎品如图10所示充气袋四周被挤压时假设袋内气体与外界无热交换则袋内气
体积减小，内能增大
体积减小，压强减小
对外界做负功，内能增大
对外界做正功，压强减小
使用NAT-PT方式完成IPv4主机与IPv6主机通信需要路由器支持在路由器上需要配置DNS-
设b＞a＞0证明．
甲乙两汽车在一平直公路上同向行驶在t=0到t=t1的时间内它们的v-t图像如图所示在这段时间内
汽车甲的平均速度比乙大
汽车乙的平均速度等于
甲乙两汽车的位移相同
汽车甲的加速度大小逐渐减小，汽车乙的加速度大小逐渐增大
设函数若反常积分fxdx收敛则
a＜-2．
a＞2．
-2＜a＜0．
0＜a＜2．
使用NAT-PT方式完成IPv4主机与IPv6主机通信需要路由器支持在路由器上需要配置DNS-
设fx在[01]连续在01可导且f0=0f1=1求证ξ≠η∈01使得
如图一理想变压器原副线圈的匝数分别为n1n2原线圈通过一理想电流表接正弦交流电源一个二极管和阻值为R
U
ab
:U
cd
=n
1
:n
2
增大负载电阻的阻值R.，电流表的读数变小
负载电阻的阻值越小，cd间的电压U.
cd
越大
将二极管短路，电流表的读数加倍
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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．
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.
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
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.
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.
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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甲乙两汽车的位移相同 汽车甲的加速度大小逐渐减小，汽车乙的加速度大小逐渐增大 
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