首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
已知函数f(x)=ex-ax-1,其中e为自然对数的底数,a∈R. (1)当a>0时,求f(x)的极值; (2)若存在实数x1,x2∈[0,2],得f(x1)=f(x2),且|x1-x2|≥1,...
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
已知函数fx=ex﹣ax+a其中a∈R.e为自然对数的底数.1讨论函数fx的单调性并写出对应的单调区
已知函数fx=ax2-lnxx∈0e]其中e是自然对数的底数a∈R..1当a=1时求函数fx的单调区
已知函数fx=ex﹣ax﹣1e为自然对数的底数.Ⅰ求函数fx的单调区间Ⅱ当a>0时若fx≥0对任意的
已知函数fx=lnx+e-ax-b其中e为自然对数的底数.若不等式fx≤0恒成立则的最小值为.
已知函数fx=k为常数e=2.71828是自然对数的底数曲线y=fx在点lfl处的切线与x轴平行.Ⅰ
已知函数fx=其中e为自然对数的底数若关于x的方程ffx=0有且只有一个实数解则实数a的取值范围为
(-∞,0)
(-∞,0)∪(0,1)
(0,1)
(0,1)∪(1,+∞)
已知函数fx=ax2+xex其中e为自然对数的底数a∈R..1当a02若fx在区间[-11]上是单调
已知函数fx=ex﹣xe为自然对数的底数1求函数fx在0f0处的切线方程2若对于任意的x∈02不等式
已知函数fx=ex﹣ax﹣1e为自然对数的底数a>0.1若a=1求函数fx在x=0处的切线方程2若f
设fx是定义在R.上的函数其导函数为f′x若fx+f′x>1f0=2017则不等式exfx>ex+2
(﹣∞,0)∪(0,+∞)
(0,+∞)
D
已知函数fx的定义域是R.f′x是fx的导数f1=egx=f′x﹣fxg1=0gx的导数恒大于零函数
﹣1
0
1
2
已知函数.1求函数fx的单调区间2已知ab∈Ra>b>e其中e是自然对数的底数求证:ba>ab.
已知函数fx=x﹣1﹣e﹣1lnx其中e为自然对数的底则满足fex<0的x的取值范围为
定义在R.上的函数fx满足f′x>1﹣fxf0=6f′x是fx的导函数则不等式exfx>ex+5其中
已知函数fx=k为常数e是自然对数的底数曲线y=fx在点1f1处的切线与x轴平行.1求k的值2求fx
已知函数fx=ax﹣1n1+x21当时求函数fx在0+∞上的极值2证明当x>0时1n1+x2<x3证
已知定义在R.上的函数fx满足fx+f'x>1f0=4则不等式exfx>ex+3其中e为自然对数的底
定义在R上的函数fx满足f′x>1﹣fxf0=6f′x是fx的导函数则不等式exfx>ex+5其中e
已知函数fx=x﹣1+a∈Re为自然对数的底数.Ⅰ若曲线y=fx在点1f1处的切线平行于x轴求aⅡ求
已知e是自然对数的底数函数fx=ex+x-2的零点为a函数gx=lnx+x-2的零点为b则下列不等式
f(a)
f(a)
f(1)
f(b)
热门试题
更多
环境中的内分泌干扰物是与某种性激素分子结构类似的物质对小鼠的内分泌功能会产生不良影响.回答下列问题. 1通常机体内性激素在血液中的浓度与靶细胞受体结合并起作用后会. 2与初级精母细胞相比精细胞的染色体数目减半原因是在减数分裂过程中. 3小鼠睾丸分泌的激素通过体液发挥调节作用.与神经调节相比体液调节的特点有答出4点即可.
假设在特定环境中某种动物基因型为BB和Bb的受精卵均可发育成个体基因型为bb的受精卵全部死亡.现有基因型均为Bb的该动物1000对每对含有1个父本和1个母本在这种环境中若每对亲本只形成一个受精卵则理论上该群体的子一代中BBBbbb个体的数目依次为
WhenawomantooktheseatbesidemeonaplaneI1feltfeeluncomfortable.Shehadtolowerherselfslowlysqueezingherbodyintothesmallspace.MynameisKelly.I'mfromCanada.Where2areyoufromShewavedahandinfrontofmyface.ChinaIsaidasIshookherhandunwillingly.Kellykepttalkingtome.Shewasverythoughtful.Whenwe3wereservedservedrinksandmealsshemadesurethatIhadenoughroominmyseat.Idon'twanttomakeyou4uncomfortablecomfortwithmyelephantsize!shesaidsincerely.Icouldn'thelplettingdownmyguard.AswetalkedIwassurprisedbyherwise5wordsword.Shehadreadmanybooksandwasverysmart.Iaskedherifsheeverthoughtabout6losinglosesomeweight.Aren'tyouworriedaboutthediseasesthatcomewithbeingoverweightNotatall.Ieat7healthyhealthfoodandwalkregularlyshesaid.Ibelieveinmyheartthepeoplewhogetdiseasesaretheoneswhoworry.YouseeadvertisementsfromexercisecentersthatreadFreeyourselffromyourextrabaggage.soyouarefreetobe8yourselfyou.'You'refreeonly9if/whenyou'recomfortablewithwhoyouare!IsuddenlyrealizedthatKellywas10themostbeautifulandcleverwomanIhadevermetinmylife.
当人体失水过多时不会发生的生理变化是
下列与真核生物细胞核有关的叙述错误的是
Whiletherestoftheworldiswakingupastheweatherturnswarmourbodiesmaynotrespondthesameway.ManyofusmaysharethesamefeelingsasweembracespringandtraditionalChinesemedicineTCMhasatermforitchunkunspringsleepiness. Althoughspringsleepinessisnotanillnessthefollowingtipsmightbeessentialforthosewhoreallyneedtostayawake. Don'tsleepmoreexercisemore Eighthoursofsleepisusuallyenoughforadults.Gettinglongersleepmayreduceactivityinthecerebralcortex大脑皮层makingpeoplesleepier.Insteadslightlyincreasethelevelofyourphysicalactivitywhichwillhelptosendmoreoxygentothebrainmakingusfeelawakeandenergetic.Exercisessuchasjoggingswimmingandropeskippingarerecommended. Fightbackwithcaffeinebutdonotoverdose Acupofcoffeeorteathatcontainsagoodamountofcaffeineisgoodforthehealthandisimportanttokeepusalertforimportantoccasionssuchasanimportantmeeting.Howevertoomuchcoffeemaycauseanacceleratedheartbeatanxietyandothersymptomsthatmaybelinkedtoheartproblems. Moreproteinandfruitsandlessoilyfoods Modernresearchfindsthatsleepinessinspringisusuallyaccompaniedbylackofproteinvitaminsandanimbalanceofacidinbodies.Tofeellightandalerteatmorefoodthatishighinproteinsuchasfishandeggsrichinvitaminssuchasorangesandlemonandfreshvegetables.Oilyfoodsandalcoholwillhavetheoppositeeffect. Pourcoldwateronyourface Ifacupofcoffeedoesn'tkeepyouawakelongenoughtrypouringcoldwateronyourfacewhichisalwaysrefreshing.Alsotrybrushingyourteethwithmint﹣scentedtoothpasteorusemouthwash. 1IfyoufeelsleepyinspringwhichofthefollowingshouldbedoneC A.Sleeplongerthanever. B.Runasquicklyaspossible. C.Pourcoldwateronyourface. D.Drinkasmuchcoffeeaspossible. 2ThefollowingcanhelpdealwithsleepinessEXCEPTD. A.eggs B.oranges C.coffee D.fat 3WhichofthefollowingcanwelearnfromthepassageB A.Themoreyousleepthebetteritis. B.Acertainamountofactivitycanbehelpfultous. C.Springsleepinessisanillness. D.Professionalsportsarestronglyrecommended. 4What'sthepassagemainlyaboutC A.Howtokeephealthy. B.Waystofightagainstillness. C.Howtostayawake. D.Relationshipbetweencoffeeandhealth
某种甘蓝的叶色有绿色和紫色.已知叶色受2对独立遗传的基因A/a和B/b控制只含隐性基因的个体表现隐性性状其他基因型的个体均表现显性性状.某小组用绿叶甘蓝和紫叶甘蓝进行了一系列实验. 实验①让绿叶甘蓝甲的植株进行自交子代都是绿叶 实验②让甲植株与紫叶甘蓝乙植株杂交子代个体中绿叶紫叶=13 回答下列问题. 1甘蓝叶色中隐性性状是实验①中甲植株的基因型为. 2实验②中乙植株的基因型为子代中有种基因型. 3用另一紫叶甘蓝丙植株与甲植株杂交若杂交子代中紫叶和绿叶的分离比为11则丙植株所有可能的基因型是若杂交子代均为紫叶则丙植株所有可能的基因型是若杂交子代均为紫叶且让该子代自交自交子代中紫叶与绿叶的分离比为151则丙植株的基因型为.
﹣Howabouthisdesign? ﹣Welltotellthetruthitisbutsatisfactory.Soyou'llhavetotryyourbesttobetterit. A.something B.anything C.everything D.nothing
ThereisnobetterwordthanunbelievabletodescribeIndiansportsfilmDangal'shugebox﹣office票房achievementintheChinesemainland. Pathtosuccess Dangal'sbox﹣officeperformanceinChinahasgoneagainstallmarketrules.Whilebox﹣officeearningsusuallytendtodeclinethelongerafilmisscreenedintheatersDangal'sbox﹣officegoesupnearlythreetimesduringitssecondweekend.OnWednesdayDangalhasmade830.94millionyuanmakingittheeighthhighest﹣earning2017filmintheChinesemainlandsofar.Dangalisnowthesecondhighest﹣earningIndianfilminChina. AccordingtothestatisticsonMaoyanaChineseonlinefilmdatabase58.2percentofmainlandmoviegoersnationwidewhoareinterestedinseeingthefilmarewomen.Thispercentageincreasesto59.1percentinthird﹣tier三线citiesand60.2percentinfourth﹣tiercities.Lookingatagemoviegoersbetween20﹣24accountforthelargestgroupwhowanttoseethefilmnationwideat33.4percentfollowedby25﹣29yearsoldat29.4percent. Secretforsuccess Whilethesecretforagoodfilmhasmanyingredientsresponseoftheaudienceisakeyfactor.Dangalastoryaboutafathertraininghisdaughterstobecomewrestlingchampionsinamale﹣dominatedsocietyhasreachedtheheartofChineseaudiencesespeciallywomenmanyofwhomfeelthatwomenareoftennottreatedequallyasmen. ShuiWujiaoanetizenwrotethatshewasveryimpressedwhenthefatherpointedoutthatGeetatheoldestdaughterwasnotonlyfightingforherselfbutalsoforthemillionsofgirlswhoareforcedintomarriagesbecausetheyarelessrespectfulthanboysbysociety.Therearesimilaritiessuchastheparent﹣childrelationshipthepressureonehastobearwhengrowingupaswellassimilarfamilyandsocialvalues.ThepreferenceforboysovergirlsisstilldeeplyrootedamongmanyChineseespeciallyinremoteareas. Learningidol Dangal'sinspirationalstoryhasalsoledtomanyteachersandparentsusingthefilmasmotivationalaids.YingJunziaChinesefilmcriticpostedthathethinksthefilm'smotivationalmessageisanotherfactorthathashelpedDangalachievethebox﹣officesuccess.FormanyChineseparentswhopaycloseattentiontotheirchild'seducationthefilmhasbecomeaneducationalbibleforencouragingtheirchildrentostudyevenharderhewrote.Chineseparentsarewillingtodoanythingfortheirchildren'seducation.Whentheyhearfromrelativesandfriendsthatthereisagoodfilmthatcanmotivatetheirchildrentoperformbettertheywilldefinitelyrushtothetheaterswiththeirkids.It'sbecomeafamilyfilmYingJunziadded. 1ThepassageismainlyaboutB. A.successofaperson B.afilmfromIndia C.famouspeopleinChina D.moneymadebyfamilies 2BasedonthetextwecanhardlyconcludethatD. A.it'samazingthatDangalispopularinChina B.thereexistsimilaritiesbetweenChinaandIndia C.womenintheirtwentiesfromlessdevelopedcitiesmightbemoreinterestedinDangal D.womenareoftennottreatedequallyasmenonlyinChina 3TheunderlinedpartaneducationalbiblepossiblyreferstoB. A.areligiousbook B.amotivationalaid C.afamilyfilm D.aneducatorfromschools
Howtoadaptyourselftocollegelife Thereareobviousdifferencesbetweenhighschoolandcollegelife.Firstcollegestudentswillliveinthedormitorywithclassmateswhocomefromvariousplacesandwhomayhavedifferentlivinghabits.Secondcollegeteachersinsteadofexplainingindetailhowtosolveeveryproblemmightonlytelldifferentapproachestotheproblemandleavestudentstostudyandsolveproblemsindependently.1A 2DFirstofallheshouldlearntobetolerantandconsidermoreforotherswhichisnecessaryforgroupliving.Moreoverheshouldtakeactivepartincollectiveactivitiesandmakemorecommunicationwithclassmatesandteachers.3F Besidesastostudyheshoulddevelopagoodhabitofself﹣teachingandlearntoarrangestudyindependently.4BHowevertheyallhavetoacceptconstantchallengesofnewthingsintheirlife.Toconcludecollegestudentsshouldtrytoadaptthemselvestocollegelifeassoonaspossible.5E A.Finallyincollegethereismorefreetimeforstudentstospendon. B.Ofcourseitmaytakeafreshmansomewhiletobecomeaccustomedtothestudyandlifeincollege. C.Thirdstudentsincollegeorinhighschoolallgetalongwellwiththeirteachers. D.Howeverhowshouldacollegefreshmanadapthimselftothesedifferences E.Inthatcasetheycantakefulladvantagesoftheirpreciouscollegetime. F.Itwillhelphimbesmoothlyintegratedwithhisnewenvironment. G.Itwillhelpcollegestudentstohaveoveralldevelopment.
GrowingupIremembermyfatherasasilentseriousman﹣notthesortofpersonaroundwhomonecouldlaugh.AsateenagerarrivinginAmericaknowingnothingIwantedafatherwhocouldexplainthehumanjourney.IncollegewhenfriendscalledhomeforadviceIwouldsinkintodeepdepressionforwhatIdidnothave. Todayattwenty﹣sevenIhavecometorediscovertheminwaysthatmyteenagemindwouldnotallow﹣asadultsandasfriendswiththeirownfaultsandweaknesses. OnenightaftermymovebackhomeIoverheardmyfatheronthetelephone.Therewassometrouble.LaterDadsharedtheproblemwithme.Apparentlymylegaltraininghadearnedmesomeprivilegesinhiseyes.ItalkedthroughtheproblemwithDadanalyzingthepurposesofthepeopleinvolvedandofferingseveralnegotiationstrategies.HelistenedpatientlybeforefinallyadmittingIcan'tthinklikethat.Iamasimpleman. Dadisabrilliantscientistwhocandeconstructthebuildingblocksofnature.Yethumannatureisamysterytohim.ThatnightIrealizedthathewassimplynotskilledatdealingwithpeoplemuchlessthetroubleofaconflictedteenager.It'snotinhisnaturetounderstandhumandesires. Andsothereitwas﹣itwasnoone'sfaultthatmyfatherheldnointerestinhumanliveswhileIplacedgreatimportanceinthem.Weareattimesbornmoresensitivewide﹣eyedanddreamythanourparentsandbecomemorecuriousandidealisticthanthem.Dadperhapsneverexpectedmeforachild.AndIwhoknewDadasanintelligentmanhadneverunderstoodthathisintelligencedidnotcoverallofmyfeelings. Ithassavedmeyearsofquestioningandconfusion.InowseemyparentsaspeoplewhohaveotherrelationshipsthanjustFatherandMother.Inowoverlooktheirmanyfaultsandweaknesseswhichonceannoyedme. Inowknowmyparentsasfriendspeoplewhoaskmeforadvicepeoplewhoneedmysupportandunderstanding.AndI'vecometoseemypastclearly. 1Whatwastheauthor'simpressionofherfatherwhenshewasateenager? A.Friendlybutirresponsible. B.Intelligentbutsevere. C.Coldandaggressive. D.Caringandcommunicative. 2Whydidtheauthorfeeldepressedwhenherfriendscalledhome? A.Shedidnothaveaphonetocallhome. B.Herfatherdidnotcareaboutherhumanjourney. C.Herfatherwastoobusytoanswerherphone. D.Herfathercouldn'tgiveherappropriateadvice. 3Aftertheauthoroverheardherfatheronthetelephone. A.heblamedherforimpoliteness B.herediscoveredhumannature C.heconsultedwithherabouthisproblem D.hechangedhisattitudetowardstheauthor 4Theauthorrealizedthat. A.herfatherhadtoomanyfaultsandweaknesses B.herfatherwasnotasintelligentasshehadthought C.herfatherwasnotgoodatinterpersonalrelationships D.herfatherplacedtoomuchimportanceinsocialactivities 5Whichofthefollowingisthebesttitleofthispassage? A.MyParentsasFriends B.MyParentsasAdvisors C.MyFatherasaSeriousMan D.MyFatherasanIntelligentScientist
AgroupthatrescueswildlifehasstartedtosearchforlandandmoneytobuildawildlifehospitalinSanFrancisco. About40volunteerscareforinjuredanimalsintheirhomesthefounderJamieRaysaid.Raypresentedherproposal提议tobuilda﹩2millionwildlifehospitalandnaturecentertoenvironmentexpertsrecently.Whatweneedtodoisbuilda100﹣foot﹣longflightnestforrecoveringbirdsandhavewaterpoolsforrecoveringwaterbirdsRaysaid.Shehopestheywillbeopenedbytheendof2018andwouldbeabletohelpcareforbirdsaffectedbyoilspills溢出intheBay.Foranyanimalwhetheritisoiledinjuredoranythingelsegettingimmediatecareisimportanttoitssurvivalshesaid. Departmentemployeesdriveasmanyas350injuredanimalseveryyeartowildlifehospitalsaccordingtoFriedman.Hesaidaround80percentofthoseanimalswerebirds.ItwouldbewonderfultohaveawildliferecoverycenterhereinSanFranciscoFriedmansaid. Ray'sproposalincludesnestsaswellasanatureeducationcenterandoutdoorpicnicarea.ShehassuggestedbuildingthecenteratLakeMercedorinwesternGoldenGatePark.AparkinglotsoccerfieldandstorageareaarepresentlybeingplannedforconstructionattheGoldenGateParksite.Anychangetothoseplanswouldneedtobeapprovedbydepartmentexperts.TheBoardofSupervisorsisalsoinchargeofthoseplans. 1WhatmaynotbeinvolvedinRay'sproposalD A.Anatureeducationcenter. B.Anest. C.Anoutdoorpicnicarea. D.Asoccerfield. 2WhatdoweknowaboutoiledbirdsB A.Theyarebeingcaredforbyvolunteers. B.Theyareprobablywaterbirds. C.Theyarecalledoiledbirdsbecausetheycanproduceoil. D.TheyarebirdsusuallyseeninSanFrancisco. 3WhatarewetoldinthepassageC A.TherearealreadywildliferecoverycentersinSanFrancisco. B.ThebirdandwildlifehospitalinSanFranciscowillbebuiltin2018. C.Itisimportantforinjuredanimalstogettimelycare. D.Thereareabout40volunteersworkinginthewildlifehospital. 4ItcanbeinferredthatC. A.Raywantstobuilda100﹣foot﹣longnest B.about350birdsareinjuredeveryyearinSanFrancisco C.birdsaremosteasilyinjuredanimalsinSanFrancisco D.RayisthefounderoftheBoardofSupervisors
如果食物链上各营养级均以生物个体的数量来表示并以食物链起点的生物个体数作底层来绘制数量金字塔则只有两个营养级的夏季草原生态系统假设第一营养级是牧草第二营养级是羊和森林生态系统假设第一营养级是乔木第二营养级是昆虫数量金字塔的形状最可能是
马铃薯块茎储藏不当会出现酸味这种现象与马铃薯块茎细胞的无氧呼吸有关.下列叙述正确的是
I'mafraidthatIcan'tattendTom'sweddingpartynextweekend. A.tobeheld B.beingheld C.held D.istobeheld
AbookIreadlastyearnameIcan'trememberchangedmyideaabouttime. A.which B.that C.whose D.what
培养胡萝卜根组织可获得试管苗获得试管苗的过程如图所示. 回答下列问题. 1利用胡萝卜根段进行组织培养可以形成试管苗.用分化的植物细胞可以培养成完整的植株这是因为植物细胞具有. 2步骤③切取的组织块中要带有形成层原因是. 3从步骤⑤到步骤⑥需要更换新的培养基其原因是.在新的培养基上愈伤组织通过细胞的过程最终可形成试管苗. 4步骤⑥要进行照光培养其作用是. 5经组织培养得到的植株一般可保持原品种的这种繁殖方式属于繁殖.
若将n粒玉米种子置于__中使其萌发得到n株黄化苗.那么与萌发前的这n粒干种子相比这些黄化苗的有机物总量和呼吸强度表现为
玉米是一种二倍体异花传粉作物可作为研究遗传规律的实验材料.玉米子粒的饱满与凹陷是一对相对性状受一对等位基因控制.回答下列问题. 1在一对等位基因控制的相对性状中杂合子通常表现的性状是. 2现有在自然条件下获得的一些饱满的玉米子粒和一些凹陷的玉米子粒若要用这两种玉米子粒为材料验证分离定律写出两种验证思路及预期结果.
Themosttypicaldefinitionofsuccessistheaccomplishmentofanaimorpurposeorwhatmostofushaveheardtheattainmentofpopularityorprofit.Butissuccessreallydefinedbypurposesorprofit? Aftergraduatingfromhighschoolmyfamilyadvisedmetoaimtobuildasuccessfulcareer.Myoptionswerenarroweddowntobecomingadoctororchoosingafieldinengineering.SoIgraduatedwithachemicalengineeringdegree.IwasadvisedtoaimforgraduatestudiesandinlessthantwoyearsIhadahighlyspecializeddegreeinplasticsengineeringfromoneofthemostreputableuniversitiesintheU.S.ThenIfoundacorporatejobperformedwellintheorganizationclimbeduptheladderandmadeabiggerpaychequewitheverynewtitle.Myproudparentstoldmystorytotherestofthefamilyandfriendsasasuccessstory. Nomatterwhereweliveintheworldweallhaveourownversionsofsuccess.Ourfamiliestakeprideintellingtheworldhowsuccessfulweareinourprofessionandoftentheonlymeasureofthatsuccessbecomesthefinancialwealthweaccumulate.Inaworldwhereeverythingisreflectedbynumbers﹣thelikesonFacebookthenumberofviewsonYouTubeetc.﹣everyaspectofourlifeisbeingtakenoverbynumbers.Weareconditionedtobelievethatthestrongeryourfinancialstandingthehigheryourankonthesuccesschart.Butrememberthewordsaimorpurposeinthedefinitionofsuccess.AltruisticfiguressuchasMotherTeresaMahatmaGandhiandMartinLutherKingJr.alsolivedsuccessfullivesbuthadselflessconcernoverthewell﹣beingofothers.Whiletherestoftheworldfocusedonaccumulatingwealththeyfocusedongivingdoingandcreatingforeveryoneelse. Wealthaloneneverwillbethemeasureofsuccess.Thinkbeyondprofits.NopromotionorpayraiseIeverreceivedinmyprofessionalcareerwasbecauseofmydeepdesiretoobtainabettertitleorhigherpayinsteaditwasbasedontheexcellenceIcreatedintheexperienceourcustomershadwiththeorganization. 1Whatdoyouknowabouttheauthor? A.Hehasliveduptohisfamily'sexpectations. B.Heaskshisparentsforadviceoneverything. C.Hedoesn'tlikehisjobthoughheiswellpaid. D.Hewantedtobeadoctorbutbecameachemicalengineer. 2What'sthecommonawarenessofsuccessaroundtheworld? A.Socialconnections. B.Contributionstosociety. C.Theaccumulationoffinancialwealth. D.Theaccomplishmentofpersonaldreams. 3WhatdoestheunderlinedwordAltruisticinParagraph3mean? A.Ofabundantwealth. B.Offewachievements. C.Devotedtoothers'welfare. D.Focusedonpersonalwell﹣being. 4Whatinspirationcanbedrawnfromtheauthor'sworkingexperience? A.Changejobsfrequentlyforhigherpay. B.Aimatprovidingqualityserviceatwork. C.Takeeverychancetogetpromotion. D.Focusonmakingprofitsfromthecustomers. 5What'stheauthor'spurposeinwritingthispassage? A.Toexplorethetruemeaningofsuccess. B.Toexpresshisinnervoicestohisparents. C.Toacknowledgethehelphehasreceivedinhislife. D.Tosharehispersonalexperienceforothers'reference.
植物组织培养技术在科学研究和生产实践中得到了广泛的应用.回答下列问题. 1植物微型繁殖是植物繁殖的一种途径.与常规的种子繁殖方法相比这种微型繁殖技术的特点有答出2点即可. 2通过组织培养技术可把植物组织细胞培养成胚状体再通过人工种皮人工薄膜包装得到人工种子如图所示这种人工种子在适宜条件下可萌发生长.人工种皮具备透气性的作用是.人工胚乳能够为胚状体生长提供所需的物质因此应含有植物激素和等几类物质. 3用脱毒苗进行繁殖可以减少作物感染病毒.为了获得脱毒苗可以选取植物的进行组织培养. 4植物组织培养技术可与基因工程技术相结合获得转基因植株.将含有目的基因的细胞培养成一个完整植株的基本程序是用流程图表示.
﹣yousinganddanceatthislatehourofthenight? ﹣SorryIwillstoprightnow. A.May B.Shall C.Will D.Must
假定你是李华你打算参加你校下周要举行的主题为WeAreAllDreamChasers英语演讲大赛你已经写完初稿请根据以下提示用英语给你的外教MissLucy写一封邮件. 1参加大赛目的 2请她帮忙纠正发音润色语言等 3约定拜访时间地点. 注意 1词数100左右 2可以适当增加细节以使行文连贯.
动物初次接受某种抗原刺激能引发初次免疫应答再次接受同种抗原刺激能引发再次免疫应答.某研究小组取若干只实验小鼠分成四组进行实验实验分组及处理见下表. 回答下列问题. 1为确定ABCD四组小鼠是否有免疫应答发生应检测的免疫活性物质是填“抗体”或“抗原”. 2再次注射抗原后上述四组小鼠中能出现再次免疫应答的组是.初次注射抗原后机体能产生记忆细胞再次注射同种抗原后这些记忆细胞能够. 3A组小鼠再次注射抗原甲一段时间后取血清血清中加入抗原甲后会出现沉淀产生这种现象的原因是. 4若小鼠发生过敏反应过敏反应的特点一般有答出2点即可.
假定你是一名高三学生名叫李华.在母亲节来临之际请你用英文给你的妈妈写一封信表示感恩并借此机会和妈妈说说知心话具体内容应包括 1.表示感恩 2.你的现状生活学习情况. 1你的高考奋斗目标 2你对自己的信心. 参考词汇高考theCollegeEntranceExamination 注意 1.词数100左右 2.可根据内容适当增加细节使行文连贯 3.开头已给出不记入总词数. DearMum Mother'sDayiscoming.
Nobodydoesn'tknowCharlieChaplinaworld﹣famousfunnyactor.People1AhaveburstoutlaughingwhenseeingCharlieChaplin'sfilms2Atearsrundowntheirfaces.Fromhisveryfirst3Ctheyknowwhatwillhappen.Thelittletrampwhoispoorandhomelessisalwayswithblackmoustachewide﹣openeyesroundblackhatand4Ctoolargeforhisfeet.Thischaracterwasasocialfailurebutwaslovedforhisoptimismand5Ctoovercomealldifficulties.Hepicksoutthelacesofshoesandeatsthemlikespaghetti.Hecutsofftheleathertopoftheshoeandeatsit6Ditwerethefineststeak.He'llstrugglethroughsnowandfallfromwindows.He'llfightwithmenwhoaretwicethe7Dofhimandalsofallinlovewithwomenwho8Bnoticehimandeventrytohug拥抱them.Theseactionsaresoconvincingthattheymakeyouloveandrememberhimasagreatactorwhocan9Cpeoplewithgreatconfidence. Hedirectsandproducesaseriesoffunnymovieswhichmakepeoplelaughatatimewhentheyfeeldepressedsotheycanfeelmorecontentwiththeirlives.TherolethatCharlieChaplin10Aindozensoffilmsmakesavarietyofstupidmistakes.Heisalwaysintroublebutheneverloses11B.Hedreamsofbecomingagreatman.Hecanactthefooldoingordinaryeverydaytasks12Bnooneiseverboredwatching.Evenpeoplewhohave13BunderstandingofEnglishcanenjoyChaplin'sfilmsbecausetheyaremostly14A.Itisn'twhathe15Dthatmakespeoplelaugh.Hiscomedydoesn'tdependonwords.Itdependsonactionswhichmeanthesamethingtopeopleallovertheworld. Chaplinraiseshisthickeyebrowsorrollshiseyes.Hehidesbehindafatladyorunderatabletoescapefromhis16C.Hedresseswellandpretendstobea17Dandimportantman.Itisallsohopelessand18Athathemakesuslaugh.SuchisthesecretofChaplin'shugesuccess.JustasVictorHugooncesaidLaughteristhesunthatdrives19Dfromthehumanfaceanduptonow20ChasbeenabletodothisbetterthanCharlieChaplin. 1A.hereandthere B.oldandyoung C.atabroad D.athome 2A.until B.once C.because D.before 3A.reaction B.entertainment C.appearance D.humor 4A.trousers B.stocks C.shoes D.hands 5A.impression B.confusion C.courage D.depression 6A.evenif B.onlyif C.ifonly D.asif 7A.length B.meter C.weigh D.size 8A.fluently B.hardly C.likely D.deeply 9A.approach B.confirm C.inspire D.admire 10A.plays B.stars C.makes D.attaches 11A.face B.heart C.wealth D.fortune 12A.which B.whom C.what D.where 13A.much B.little C.better D.more 14A.silent B.intelligent C.frightening D.appealing 15A.performs B.expects C.absorbs D.says 16A.behaviors B.characters C.enemies D.customers 17A.badlyoff B.welloff C.considerate D.wealthy 18A.impossible B.disappointed C.beneficial D.beautiful 19A.smile B.happiness C.energy D.winter 20A.everybody B.somebody C.nobody D.anybody
Inordertosatisfytheneedsofthemarkettheelectriccompanyhasitsfocustotabletcomputersandsmartmobilephones. A.switched B.shaped C.directed D.discovered
Theteacherwhodidthemosttoencouragemewasasithappenedmyaunt.ShewasMyrtleC.Manigaultthewifeofmymother'sbrotherBill.Shetaughtinsecondgradeatall﹣blackSummerSchoolinCamdenFlewJersey.DuringmychildhoodandyouthAuntMyrtleencouragedmetodevelopeveryaspectofmypotentialwithoutregardforwhatwasconsideredpracticalorpossibleforblackfemales.Ilikedtosingshelistenedtomyvoiceandpronounceditgood.Icouldn'tdanceshetaughtmethebasicdancingsteps.Shetookmetothetheatrenotjustchildren'stheatrebutadultcomediesanddramas﹣﹣﹣andherfaiththatIcouldappreciateadultplayswasnotdisappointed. Myauntalsotookdownbooksfromherextensivelibraryandsharedthemwithme.Ihadbooksathomebuttheywereallseriousclassics.EvenasachildIhadastronglikingforhumorandI'llneverforgetthejoyofdiscoveringDonMarquis'sArchyandMehitabelthroughher. MostimportantlyperhapsAuntMyrtleprovidedmyfirstopportunitytowriteforpublication.Awriterherselfforoneoftheblacknewspapersshesuggestedmynametotheeditorasayouthcolumnist.PolycolumnbegunwhenIwasfourteenwassupposedtocoverteenagesocialactivities﹣anditdid﹣butitalsogavemethefreedomtowriteonmanyothersubjectsaswellasthehabitofgatheringmaterialthedisciplineofmeetingdeadlinesandaftergraduationfromcollegesixyearslaterasolidcollectionofpublishedmaterialthatcarriedmynamewasmypassporttoaseriesofwritingjobs. TodayAurthlyrtteisstillanenthusiasticsupporterofherfavoriteniece.Likeadiamondshehasreflectedabrightmultifaceted多面的imageofpossibilitiestoeverypupilwhohascrossedherpath. 1WhichofthefollowingdidAuntMyrtledototheauthorduringherchildhoodandyouthB A.Shelenthersomeseriousclassics. B.Sheintroducedhertoadultplays. C.Shediscoveredhertalentfordancing. D.Shecultivatedhertasteformusic. 2WhatdoesArchyandMehitabelinParagraph2probablyrefertoC A.Aseriousmasterpiece. B.Awriterofhighfame. C.Abooksofgreatfun. D.Aheartbreakingplay. 3AuntMyrtlerecommendedtheauthortoanewspapereditormainlytoA. A.develophercapabilitiesforwriting B.giveherachancetocollectmaterial C.involveherinteenagesocialactivities D.offerheraseriesofwritingjobs 4WecanconcludefromthepassagethatAuntMyrtlewasateacherwhoD. A.trainedpupilstobediligentandwell﹣disciplined B.helpedpupilsovercomedifficultiesinlearning C.emphasizedwhatwaspracticalorpossibleforpupils D.gavepupilsconfidenceinexploitingtheirpotential
Akindergartenteacherhaddecidedtoletherclassplayagame.Theteachertoldeachchildintheclasstobringalongaplasticbag1afewpotatoes.Eachpotatowillbe2anameofapersonthatthechildhates.Sothe3ofpotatoesthatachildwillputinhis/herplasticbagwill4actuallyhowmanypeoplehe/shehates. Sowhenthe5cameeverychildbroughtsomepotatoes.Somehadtwopotatoessomethree6someuptofivepotatoes.Theteacherthentoldthechildrentocarrythepotatoesintheplasticbagwiththemwherevertheygoforawhole7.Daysafterdays8andthechildrenstartedtocomplainduetothe9smellletoutbytherottenpotatoes.Besidesthosehavingfivepotatoesalsohadtocarry10bags.Aftersevendaysthechildrenwere11becausethegamehadfinallyended. TheteacheraskedHowdidyou12whilecarryingthepotatoeswithyou?Thechildrenstartedcomplainingofthetroublethattheyhadto13havingtocarrythe14andsmellypotatoeswherevertheygo. Thentheteachertoldthemthehidden15behindthegame.TheteachersaidThisis16thesituationwhenyoucarryyourhatredforsomebodyinsideyourheart.Thestench臭味of17willpolluteyourheartandwithyouforever.Ifyoucannot18thesmellofrottenpotatoesforjustaweekcanyou19whatisitliketohavethestenchofhatredinyourheartforyour20? 1A.containing B.wrapping C.decorating D.collecting 2A.called B.planted C.made D.given 3A.weight B.size C.number D.shape 4A.focuson B.dependon C.leadto D.makeup 5A.day B.class C.meeting D.trouble 6A.so B.as C.because D.while 7A.day B.week C.year D.month 8A.walked B.disappeared C.passed D.ran 9A.unpleasant B.poisonous C.sweet D.funny 10A.shorter B.senior C.prettier D.heavier 11A.disappointed B.shocked C.relieved D.suspected 12A.keep B.say C.feel D.make 13A.putout B.gothrough C.catchup D.insiston 14A.ugly B.numerous C.huge D.heavy 15A.meaning B.feeling C.emotions D.kindness 16A.hardly B.slightly C.exactly D.partly 17A.potatoes B.hatred C.words D.dirt 18A.produce B.smell C.carry D.tolerate 19A.imagine B.analyze C.agree D.declare 20A.family B.lifetime C.childhood D.friends
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.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每处错误及修改仅限一词2只允许修改10处多者从第11处起不记分. Iwasbornin1642inFrance.AfterIwasprogrammedbyanoperatorwhousedcardswithholesIcouldthinklogical.In1936myrealfatherAlanTuringdescribeshowcomputerscouldbemadetosolveanymathematicalproblembybuildingauniversalmachine.Peopleweresurprisingatmyartificialintelligence.Inearly1960sIgotafamilyconnectingbyanetwork.MymemorybecametoolargethatevenIcouldn'tbelievethem!AndmymemoryhasdevelopedsomanythatIneverforgetanything.MyfamilyandIhavebeenusedbybillionofpeoplesince1970.IamhappybecauseIhavebeenbuilttoserveforhumanracesincemybirth.
热门题库
更多
高一上学期英语
高一下学期化学
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