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函数f(x)=的大致图象为( )
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高三下学期数学《》真题及答案
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在同一平面直角坐标系中函数y=gx的图象与y=ex的图象关于直线y=x对称而函数y=fx的图象与y=
若函数 y = f x 的图象如图所示则函数 y = - f x + 1 的图象大致为
@B.
@D.
已知函数y=fx的导函数f′x的图象如图所示试画出函数y=fx的大致图象.
函数fx=3﹣x2•ln|x|的大致图象为
已知函数fx=sinωx+φω>0.若fx的图象向左平移个单位所得的图象与fx的图象重合则ω的最小值
已知二次函数fx的图象如图所示则其导函数f′x的图象大致形状是
.关于函数fx=2sinx-cosxcosx的下列四个结论:①函数fx的最大值为;②把函数fx=si
函数fx=lnx2+1的图象大致是
选项A
选项B.
选项C
选项D.
已知函数fx=sinωx+ω>0的最小正周期为π.1求ω的值并在下面提供的坐标系中画出函数y=fx在
函数fx=lnx的图象与函数gx=x2-4x+4的图象的交点个数为
0
1
2
3
已知fx是定义在R.上的奇函数当x≥0时fx=2x-x2.1求函数fx的表达式并画出其大致图象2若当
函数y=fx处处可导且对任意x∈R.f′x>0恒成立当x1<x2时f′x1>f′x2则下列叙述正确的
函数y=f(x)单调递增且图象向下凹陷
函数y=f(x)单调递减且图象向上凸起
函数y=f(x)单调递减且图象向下凹陷
函数y=f(x)单调递增且图象向上凸起
已知导函数f′x的下列信息当14或x
函数y=fx的图象如图所示则导函数y=f′x的图象大致是
已知二次函数y=x2﹣2x﹣8.1求函数图象的顶点坐标对称轴及与坐标轴交点的坐标2并画出函数的大致图
函数y=fx的图象如图所示试画出导函数f′x图象的大致形状.
已知定义在R.上的函数fx其导函数f′x的大致图象如图所示则下列叙述正确的是
f(b)>f(c)>f(d)
f(b)>f(a)>f(e)
f(c)>f(b)>f(a)
f(c)>f(e)>f(d)
已知函数y=fx的周期为2当x∈[-11]时fx=x2那么函数y=fx的图象与函数y=|lgx|的图
10个
9个
8个
1个
若函数y=fx的图象如图所示则函数y=f1﹣x的图象大致为
若函数y=fxx∈R满足fx+2=fx且x∈[-11时fx=|x|.则函数y=fx的图象与函数y=l
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WheneverPrinceGeorgestepsoutforanengagementlikeontheroyaltourofCanadaorposes摆姿势forofficialphotographsthere'sonethingaboutthelittleroyalthathaslongconfusedroyalwatchers:thefactthatheonlyeverwearsshorts. AccordingtoWilliamHansonanetiquette礼仪expertthereisaverygoodreasonforthis﹣﹣﹣andithasnothingtodowithfashionbutratherroyaltradition. It'saveryEnglishthingtodressayoungboyinshortsWilliamHansonsaid.TrousersareforolderboysandmenwhereasshortsonyoungboysisoneofthosesilentBritishclassmarkersthatwehaveinEngland.Althoughtimesareslowlychangingapairoftrousersonayoungboyisconsideredquitemiddleclass﹣﹣﹣quitesuburban.Noself﹣respectingroyalwouldwanttobeconsideredsuburban.EventheDuchessofCambridge. ThetraditioncanbetracedbackthroughtheroyalfamilywithbothPrincesWilliamandHarryregularlyseenwearingshortsuntiltheywereconsideredoldenoughtoprogresstofull﹣lengthtrousers. TheusualcustomisthataboygraduatestotrousersaroundeightyearsoldWilliamadded.Thisishistoricallyperhapsduetothepracticeof‘breeching'whichdatesbacktothesixteenthcentury.Anewbornboywouldbedressedinagownfortheirfirstyearortwoandthenhewas‘breeched'andworearticlesofclothingthatmoreresembledshortsortrousersthandresses. UltimatelyheconcludedinthecaseofWilliamandKatethedecisiontodressGeorgeinshortsismorelikelydowntotraditionthanaclassissue. Themodernhabitofupperclassfamilieschoosingtodresstheirboysinshortswilldeliberatelyharkbackto使人想起abygoneagehesaid.TheBritishuppersetarealwayskeentoholdontotraditionandthisonealsosilentlymarksthemoutfrom‘therest'. 1WhydoesPrinceGeorgeonlywearshorts? A.PrinceGeorgelovesshorts. B.PrinceGeorgelovessports. C.Shortsareasignoffashion. D.Wearingshortsisaroyalpractice. 2WhichofthefollowingwordsbestdescribePrinceGeorge'swearingshorts? A.Reasonable. B.Practical. C.Traditional. D.Fashionable. 3WhydoWilliamandKatedressPrinceGeorgeinshorts? A.Theywanttoholdontotradition. B.Theywanttokeeptoroyalfashion. C.Theywanttotrainhimtokeepoutthecold. D.Theywanttoignoretheirsocialposition.
OnceImetataxidriverinhislate10s.He1anddrovemetomydestination.OnthewayIaskedhimhowhis2was.Hetoldmebrieflythatitwasjustfinebutthecostofgaswas3hurtinghisbottomline.Wethenenteredintoaspiriteddiscussionaboutthe4environment. Hetoldmethathehad5whilehuntingforanothertypeofworkbecauseofhisbackground.Iama6criminalhesaidstraightforwardly.PeoplelookatmyrecordandthenI'mtoast完蛋了he7.IknowI8butI'veturnedmylifearoundandhavebeen9forseveralyearshewentontoexplain. Itisnever10tostartanewlifeIsaidbutthemostimportantthingisthatyouarestartingandthatyouhave11. Thedriverseemed12ashelookedback.Likewhat?heasked.Youcangobackto13evenpart﹣timeifyoudon'twanttodriveataxifortherestofyourlifesoyoucan14foratradeyouareinterestedin.Ireplied. Ifeltamomentofpainforhimbecauseheisstillinatypeof15eachday.Ihavemetmanyotherpeoplelikehimovertheyears﹣theonly16isthattheyhavenevercommittedcrimes.Thesearepeoplewhoalreadyhavegoodjobsandgoodreputationsbutaretotally17withtheirlives.Thedailyprisontheygotoisonewhereworkis18whereeachdayisfullofworrywishingforsomethingbetter.Thisisaprisonofthe19. Ifthisisyourdailylifeknowthatthereisalwaysanopportunityto20yourlife.Thedecisionisyoursandyoursalone. 1A.tookmeaway B.pickedmeup C.droppedmeoff D.sentmeback 2A.health B.family C.business D.study 3A.possibly B.really C.hardly D.merely 4A.job B.office C.finance D.security 5A.motivation B.experience C.confidence D.difficulty 6A.dangerous B.professional C.former D.escaped 7A.warned B.criticized C.threatened D.complained 8A.messedup B.brokeup C.hurriedup D.wokeup 9A.hopeful B.clean C.tough D.quiet 10A.worthwhile B.useful C.possible D.easy 11A.strengths B.experiences C.choices D.friends 12A.worried B.surprised C.relieved D.satisfied 13A.school B.jail C.normal D.court 14A.care B.ask C.qualify D.account 15A.fantasy B.job C.prison D.game 16A.advantage B.limitation C.requirement D.difference 17A.dissatisfied B.patient C.unfamiliar D.delighted 18A.appreciated B.hated C.expected D.envied 19A.fortune B.fame C.hope D.mind 20A.change B.accept C.protect D.devote
Ihadbeenlivinginawhirl:studyingtheorganattheUniversityofArizonaconductingaspeechclinicintownandteachingaclassinmusicalappreciationattheDesertWillowRanchwhereIwasstaying.Iwasgoingtopartiesdanceshorsebackridesunderthestars.OnemorningIcollapsed.Myheart!Youwillhavetolieinbedforayearofcompleterestthedoctorsaid.Hedidn'tencouragemetobelieveIwouldeverbestrongagain. Inbedforayear!Tobeinvalid﹣﹣﹣perhapstodie!Iwasterror﹣stricken!Whydidallthishavetohappentome?WhathadIdonetodeserveit?Iswept.Iwasbitter.ButIdidgotobedasthedoctoradvised.AneighborofmineMr.Rudolfanartistsaidtome:Youthinknowthatspendingayearinbedwillbeatragedy.Butitwon'tbe.Youwillhavetimetothinkandgetacquaintedwithyourself.Youwillmakemorespiritualgrowthinthesenextfewmonthsthanyouhavemadeduringallyourpreviouslife. Ibecamecalmerandtriedtodevelopanewsenseofvalues.Ireadbooksofinspiration.OnedayIheardaradiocommentatorsay:Youcanexpressonlywhatisinyourownconsciousness.Ihadheardthewordslikethesemanytimesbeforebutnowtheyreacheddowninsidemeandtookroot.IdeterminedtothinkonlythethoughtsIwantedtoliveby:thoughtsofjoyhappinesshealth.IforcedmyselfeachmorningassoonasIawoketogooverallthethingsIhadtobegratefulfor.Nopain.Alovelyyoungdaughter.Myeyesight.Myhearing.Lovelymusicontheradio.Timetoread.Goodfood.Goodfriends.Iwassocheerfulandhadsomanyvisitorsthatthedoctorputupasignsayingthatonlyonevisitoratatimewouldbeallowedinmycabin﹣﹣﹣andonlyatcertainhours. NineyearshavepassedsincethenandInowleadafullactivelife.IamdeeplygratefulnowforthatyearIspentinbed.ItwasthemostvaluableandthehappiestyearIspentinArizona.ThehabitIformedthenofcountingmyblessingseachmorningstillremainswithme.Itisoneofmymostpreciouspossessions. 1Thewriterhadtolieinbedforayearbecause. A.shewasterror﹣strickenatthattime B.shehadaseriousheart﹣attack C.shewaswornoutbecauseofhardwork D.thedoctorwantedhertodoso 2Whentoldtolieinbedtotakeayear'srestthewriter. A.wasverygratefultothedoctor B.becameveryworried C.turnedtoaneighborMr.Rudolfforhelp D.thoughtofherbitterexperiencesinthepast 3ThereasonwhythewritersaidIamdeeplygratefulnowforthatyearIspentinbedliesinthat. A.sheledaverycomfortablelifethatyear B.shebecameusedtolyinginbed C.sheperfectlyrecoveredfromherillness D.shecametoknowhowtoleadanactivelife 4Thewritertoldusofherstorymainlyto. A.tellusthatweshouldbegratefulforwhatwehavehad B.introduceherselftousbecauseshewaswiseandkind C.explainthatlyinginbedforalongtimeisnotaterriblething D.encourageustoachieveasmuchaswecan
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Whenbuildinghousespeopleusedtothinkaboutnotonlytheclimateoftheareasbutalsothebuildingmaterialsandthefashionsfortheirhouses.Howeversinceelectricitybecamemoreandmoreexpensivepeoplebegantopaymuchmoreattentiontotheenergytheycouldgetfortheirhousesandthenewwaystheycouldfindtoprotecttheirhousesfrombothcoldandheat. Nowhousesofanoldyetnewtypehavebeenwidelybuilt.Insomepartsoftheworldpeoplesharetheirhouseswiththeirlivestock家畜.Duringcoldweathertheygathertheircowsgoatsorotheranimalsandkeepthemonthefirstflooroftheirhouses.Thereasonsarethattheanimalscanbeprotectedfromthecoldandthattheycanhelptoheatthehousesaswell.Thebodyheatgivenoffbytheanimalsrisestothesecondfloorofthehouseswherepeoplelive.Bysharingtheirhouseswiththeirlivestockpeoplegainasourceofheat. Peoplewholiveinornearcitiesdonotusuallykeeplivestock.Howeverhomebuildersusethefactthatheatrises.Thisnaturallawcanbeusedinbuildinghousesintheseareas.Insteadofkeepinglivestockonthefirstfloorbuildersfillitwithlargerocks.Astheyareopentothesun'sraysduringcoldweathertheserockstakeinheat.Theyalsogiveofftheheatandofcoursethewarmairrisesintothelivingareasofthehouses.Sothesehousesareenergy﹣saving. House﹣buildingbecomesagreatchallenge挑战tobuildingdesignersandenergyengineers.Theytrytomeetthischallengebylearningfromoldtraditionsandbyusingmoderntechnology.Andsomedayinthefuturepeoplewillbeabletoliveinmoreenergy﹣savinghouses. 1Whatdidpeoplebegintoconsideraselectricitywasnolongercheap? A.Theclimateoftheirareas. B.Theenergyfortheirhouses. C.Thefashionsfortheirhouses. D.Thebuildingmaterialsfortheirhouses. 2Peopleinsomeareasgainasourceofheatby. A.keepingtheirlivestockdownstairs B.protectingtheirlivestockfromthecold C.sharingtheirhousesonlywiththeircows D.livingonthesecondfloorwiththeirlivestock 3Theunderlinedwordsnaturallawinthethirdparagraphrefertothefactthat. A.heatraisesthetemperatureinthehouses B.heatgoesintheupwarddirection C.heatgoesupiftemperatureisraised D.heatincreasesthetemperatureofrocks
假定你是李华你的同班同学__的家乡遭受台风彩虹TyphoonMujigae袭击洪水毁坏了家园你作为班长代表班级给正在抗洪的他写一封慰问信要点如下: 1.对该同学表示关心; 2.向其提供一些帮助如捐助和补习; 3.表达希望和对其重建家园的信心; 注意: 1.词数80左右. 2.可以适当增加细节以使行文连贯. 3.开头已给不计入词数. DearWangGang We'resosorrytohearthatasevereTyphoonMujigaehityourhometownleavingyourhouseinruins. Yourssincerely LiHua
MospeoplenowadaysownadevicethatfeaturesartificialinwiththeliesofSiralwaystheretogreetuswithafriendlyvoice.ButtheMicrosoft'sXiaolceisdifferent.Launchedin2014fortheChinesemarketshehasacreativeedgeoverhercompetitors. WhilemostAIassistantssimplyreadoutinformationtheygetonlinesuchasmovielistingsorweatherforecastsXiaolcehasrealnessthattheothersck.IndeedifyouaskednicelyshecouldreadyouapoemfromhernewweeklycolumninWestChinaCityDaily.ThenewspaperhasbeenprintingXiaolce'sself﹣pennedpoetryeachweeksinceAug19takenfromherownbookofpoemsTheSunlightthatLosttheClassWindow. ToturnXiaoiceintoamasterofpoetryMicrosoftscientistsfedhertheworksofover500influentialmodernpoetsincludingthoseofHuShiinHuiyinXuZhimoandWenYiduoreportedChinaDaily.Thisledtoherfiguringoutawritingstyleofherownandcreatingover70000originalpoemswith137usedtoproducethebook. MostofthepoemsareindistinguishablefromthosewrittenbyhumansandXiaolce'sbookevengotgoodfeedbackfromexperts.Xiaolce'sworkcarriesastrangetaste.ThemoreyouchewonitthemoreinterestingitbecomesZhangZonggangaliteratureprofessorattheNanjingUniversityofScienceandTechnologytoldtheSouthChinaMorningPostButitseemsnoteveryoneisafan. Thepoemsdisgustedmewiththeirslipperyandrhythm.ThesentenceswereaimlessandsuperficiallackingtheinnerlogicforemotionalexpressionYuan﹣basedpoetYuJiantoldChinaYouthDaily. Thisisn'tthefirstAIistoattemptpoetry.LastyearGoogle'sParseyMcParsefacemadesomepoemsofitsownalthoughtheywerebrandedmiserableandmournfulbyreviewers. WhileitseemslikeAlisbecomingmoreintelligentandlessartificialallthetimewhenitcomestocreativityperhapsthisisonejobthatsoftwareshouldleavetoushumans. 1WhathasmadetheMicrosoft'sXinolcedifferentfrommostAlassistants? A.Artificialintelligence B.Emotionalexpression. C.Toneandrhythm D.Creativityandrealness 2WhichofthefollowingaboutXiaolceisTrueaccordingtothepassage? A.Xiaolceimitatesinfluentialmodempoetstowritepoems B.Allherpoemsareexactlylikethosewrittenbyhumans C.EveryonedoesnotenjoyXinolce'swork. D.XiaolceisthefirstAltowritepoems. 3WhatisthewritersattitudetowardsthecreativityofAI? A.Hopeful. B.Doubtful C.Concerned. D.Ambiguous.
某种H+﹣ATPase是一种位于膜上的载体蛋白具有ATP水解酶活性能够利用水解ATP释放的能量逆浓度梯度跨膜转运H+.①将某植物气孔的保卫细胞悬浮在一定pH的溶液中假设细胞内的pH高于细胞外置于暗中一段时间后溶液的pH不变.②再将含有保卫细胞的该溶液分成两组一组照射蓝光后溶液的pH明显降低另一组先在溶液中加入H+﹣ATPase的抑制剂抑制ATP水解再用蓝光照射溶液的pH不变.根据上述实验结果下列推测不合理的是
Attitudeisn'tquiteeverythingwhenitcomestobeingsuccessfulbutattitudeplaysapartineverystageofyourlife.Apoorattitudegetsmorepeople1thananyothersinglefactorandagoodattitudegetspeoplejobsandhelpsthem2thosejobsmorethananyotherfactor. Yourattitude3manypeoplefromyourfamilytothestrangeronthestreetcorner.Yourattitudeisparticularlyimportantwhenyou4seeminglyhopelesssituations.Losingajoborafriendbecauseofapoorattitudeis5. Youcanfindatleasttwo6tolookateverything.Apessimistlooksfordifficultyintheopportunitywhileanoptimistlooksforopportunityinthedifficulty.Apoetoflongagoputthe7betweenoptimismandpessimismthisway:Twomen8outfromprisonbars﹣﹣﹣onesawmud;theothersawstars. Unfortunatelymanypeoplelookonlyatthe9andnotattheopportunitythatlieswithintheproblem.Many10complainaboutthedifficultyoftheirjobsforexamplenotrealizingthatifthejobwere11theemployerwouldhiresomeonewithlessabilityatalowerwage.Asmallcoincanhideeventhesunifyouholdthecoincloseenoughtoyour12.Sowhenyougettooclosetoyourproblemsto13objectivelyaboutthemtryto14howyourvisioncanbe15.Takeastepbackandlookatthesituationfromanewangle. Youcan'tdoanythingtochangethefactthataproblem16butyoucandoagreatdealtofindtheopportunitywithinthatproblem.You're17abettertomorrowbydoingyourbesttodayand18aplanofactionforthetomorrowsthatlieahead.19justrememberto20apositivementalattitude. 1A.hired B.fired C.employed D.engaged 2A.offer B.supply C.keep D.create 3A.affects B.costs C.makes D.trains 4A.lose B.predict C.judge D.face 5A.unfortunate B.unnecessary C.inconvenient D.impossible 6A.desires B.ways C.spirits D.solutions 7A.importance B.necessity C.similarity D.difference 8A.looked B.glared C.celebrated D.concluded 9A.everything B.situation C.problem D.possibility 10A.employers B.employees C.bosses D.secretaries 11A.simple B.tough C.difficult D.interesting 12A.ear B.nose C.eye D.mouth 13A.worry B.ignore C.admit D.think 14A.keepinmind B.keepintouch C.getridof D.doawaywith 15A.observed B.blocked C.imagined D.doubted 16A.appears B.works C.exists D.contains 17A.guaranteed B.persuaded C.satisfied D.convinced 18A.struggling B.developing C.dreaming D.balancing 19A.Inthisrespect B.Incontrast C.Inotherwords D.Inaword 20A.consider B.amuse C.occupy D.maintain
回答下列与生态系统相关的问题. 1在森林生态系统中生产者的能量来自于生产者的能量可以直接流向答出2点即可. 2通常对于一个水生生态系统来说可根据水体中含氧量的变化计算出生态系统中浮游植物的总初级生产量生产者所制造的有机物总量.若要测定某一水生生态系统中浮游植物的总初级生产量可在该水生生态系统中的某一水深处取水样将水样分成三等份一份直接测定O2含量A另两份分别装入不透光甲和透光乙的两个玻璃瓶中密闭后放回取样处若干小时后测定甲瓶中的O2含量B和乙瓶中的O2含量C.据此回答下列问题. 在甲乙瓶中生产者呼吸作用相同且瓶中只有生产者的条件下本实验中C与A的差值表示这段时间内C与B的差值表示这段时间内A与B的差值表示这段时间内.
在真核细胞的内质网和细胞核中能够合成的物质分别是
IgrewupinanagewhenIhadtowaitforalmosteverything.Classicmovieswereshownontelevision.Andofcourseonehadtobehomeattheappointedtimetowatchthem.TheWizardofOzforexamplewasbroadcastonlyonceayear.Thesteadilyheighteningsenseofexpectationasthebroadcastdateapproachedwasalmosttoomuchformy10﹣year﹣oldhearttobear. Andthentherewasmoney.Thebanksdidbusinessonweekdaysonly.Theyopenedat9andclosedat4.Youneededmoneybutdidn'tmakeittothebankontime?Wellcheckunderthesofacushionsorborrowfromfamilyorfriends. Suchwastheworldasrecentlyasthe1970s.Everythingseemedtooperateonastrictclockandthewordsondemandhadnomeaning.Thiswasthewaythingsworkedanditwasallweknew. Andthenseeminglyovernighteverythingchanged.ItsuddenlyseemedasifIneverhadtobeanywhereatanappointedtimebecauseeverythingwasavailableallthetime.Thechangedtimesontheotherhandhaveencouragednothinglessthanaconstantsenseofurgencywhichisironic讽刺性:Ifwecanhaveanythingwewantanytimewewantitshouldn'twebelesshurried?Theansweristhatanondemandlifestylehascreatedanappetiteforspeed:IfIcanhavesomethingthisfastwhycan'tIhaveitfaster?RecentlyIreadabookthathasFSTRgetit?writtenacrossitscover.Oneofitsmetaphors隐喻wastelling:Firsttherewasthefresh﹣squeezedlemon;thentherewasthelemonademix;nowwejustbuythelemonadebythegallon加仑. AndsoonthishotdayIwenttothesupermarketandboughtthreefreshlemons.Isqueezedthemintoatallglass.ThenIfilledtheglasswithcoldwatericeandateaspoonofsugar.FreshlemonadeinhandIwentoutsidesatinmylawnchairandlookedoutovertheriver. Yestimepassesquickly.Butnowandthenitdoesn'thaveto. 1HowdidtheyoungauthorfeelaboutwatchingTheWizardofOz? A.Excited B.Surprised C.Touched. D.Worried 2What'stheauthor'sattitudetowardtheconceptconveyedinbookhereadrecently? A.Positive. B.Optimistic. C.Cautious. D.Opposing. 3Whatdoestheauthortrytoconveybymakinglemonadehimself? A.Hisprideinmakingthemosttastyjuice.. B.Hissatisfactionofmakinguseofmoderntechnology. C.Hisdisapprovalofthedemandsofahurriedage. D.Hisdisappointmentatthelemonadeinthesupermarket. 4Whatcanbeasuitabletitleforthetext? A.Howdowebalancespeedandwork? B.Wewaitedanditwasworthit. C.Whydoestimepassquicklynow? D.Weworrybutitmakesnosense.
赫尔希和蔡斯的T2噬菌体侵染大肠杆菌实验证实了DNA是遗传物质下列关于该实验的叙述正确的是
假设你是李华.你校英文报正在征集关于如何保持身体健康的短文.请根据以下提示用英语写一篇短文. 1.健康的饮食; 2.适当的运动; 3.良好的生活习惯. 注意: 1.词数80左右. 2.可适当增加细节以使行文连贯.
某种植物的羽裂叶和全缘叶是一对相对性状.某同学用全缘叶植株植株甲进行了下列四个实验. ①让植株甲进行自花传粉子代出现性状分离 ②用植株甲给另一全缘叶植株授粉子代均为全缘叶 ③用植株甲给羽裂叶植株授粉子代中全缘叶与羽裂叶的比例为11 ④用植株甲给另一全缘叶植株授粉子代中全缘叶与羽裂叶的比例为31 其中能够判定植株甲为杂合子的实验是
物质W是一种含氮有机物会污染土壤.W在培养基中达到一定量时培养基表现为不透明.某研究小组欲从土壤中筛选出能降解W的细菌目标菌.回答下列问题. 1要从土壤中分离目标菌所用选择培养基中的氮源应该是. 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示.如果要得到目标菌应该选择菌落进一步纯化.选择的依据是. 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即. 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E.为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容. ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同. ②一段时间后测量透明圈的直径.若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明.
Somepeoplearesorude! Whosendsane﹣mailoratextmessagethatjustsaysThankyou?Wholeavesavoicemailmessageratherthantextsyou?WhoasksforafacteasilyfoundonGoogle?Don'tthesepeoplerealizethatthey'rewastingyourtime? MaybeI'mtherudeonefornotappreciatinglife'slittlepoliteness.Butmanysocialagreedstandardsjustdon'tmakesensetopeopledrowningindigitalcommunication. Intextsyoudon'thavetodeclarewhoyouareorevensayhello;E﹣mailtooisslowerthanatext;Voicemailisanowimpolitewayoftryingtoconnect. MyfatherlearnedthislessonafterleavingmeadozenvoicemailmessagesnoneofwhichIlistenedto.ExasperatedhecalledmysistertoexpresshisdissatisfactionthatIneverreturnedhisphonecalls.Whyareyouleavinghimvoicemails?mysisterasked.Justtexthim. Intheageofthesmartphonethereisnoreasontoaskonce﹣acceptablequestionsabout:theweatherforecastabusiness'sphonenumberordirectionstoahousearestaurantwhichcanbeeasilyfoundonGoogleMaps.Butpeoplestillaskthesethings.Andwhenyouanswertheyrespondwithathank﹣youe﹣mail. Howtohandlethesedifferingstandards?Easy:Consideryouraudience.Somepeopleespeciallyolderonesappreciateathank﹣youmessage.Otherslikemewantnoreply. Theanthropologist人类学家MargaretMeadoncesaidthatintraditionalsocietiestheyounglearnfromtheold.Butinmodernsocietiestheoldcanalsolearnfromtheyoung.Here'shopingthatpolitenessnevergoesoutoffashionbutthattime﹣wastingformsofcommunicationdo. 1Whydidn'ttheauthorlistentohisfather'svoicemailmessages? A.Hethoughtvoicemailwouldwastehistime. B.Hethoughtvoicemailwasanimpolitewayoftryingtoconnect. C.Hethoughtvoicemailwasanimportantwayofcommunication. D.Hethoughthisfatherlefthimtoomanyvoicemails. 2Whatseemstobetheauthor'sattitudetowardtexts? A.Favorable. B.Doubtful. C.Reserved. D.Disapproving. 3Whatdoestheauthorsuggestmodernpeopledoincommunication? A.Learnfromtheoldgeneration. B.Askonce﹣acceptablequestions. C.Respondwithathank﹣youemail. D.Considertheiraudience.
假定你是李华.因你班地理老师MrLee出差在外明天上午的地理课改为英国文学课请按以下要点口头告知大家: 1.课程变动情况; 2.说明原因; 3.课前预习任务布置. 注意: 1.词数80左右; 2.可适当增加细节以使行文连贯.
下列关于细胞内蛋白质和核酸的叙述正确的是
假定你住在一个涉外小区社区委员会请你帮忙用英文以短文的形式写一封电子邮件将周末农家果摘活动的安排传达给住户. 要点: 时间:下周六上午8.00至1100 内容:采摘苹果 报名:下周四下午500前:社区办公室 提示:带帽子手套等 注意: 1.词数:80左右 2可适当增加细节以使行文连贯 参考词汇:社区Community
Yourcolleague'ssharpcommentkeepsreplayinginyourmind.Twoofyourstudentsaretrappedinahesaid/shesaidbattle.Whenyoureflectonyouremotionalreactionsyousometimesgetcaughtupincyclesofnegativefeelingswhichcanmakeyoufeelevenworse.Ifsotheanswermaylieinaskillcalledself﹣distancingtheabilitytotakeastepbackandviewyourselfmoreobjectively.Accordingtoaresearchwhenpeopleadoptself﹣distancingwhilediscussingadifficulteventtheymakebettersenseoftheirreactionsexperiencelessemotionalsufferinganddisplayfewersignsofstress. Butwhatmightself﹣distancinglooklikeinaction?Consideratypicalhesaid/shesaidstudentconflictwheretheyareeachfocusingontheirownfeelings.OneisthinkingIcan'tbelievehedidthattome.AndanotherinsistsShereallyhurtmyfeelings.Howeverifyouaskthemtotaketheself﹣distancingtheymightstepoutsideofthemselvesandaskbroaderquestions:Whywashesohurtinthissituation?orHowdidherangeraffecthim? Althoughthisapproachmaysoundtoosimpletobeeffectivestudiesindicatethatachangeinpointofviewcanhaveapowerfuleffectonthewaypeoplethinkfeelandbehave.Hereareseveraldifferenttechniquesyoucantry. Firstconsiderhowathoughtfulfriendmightrespondafterquietlyobservingtheirsituation.BesidesavoidusingthepronounI.Focusonusingthird﹣personpronounsheshetheyandtheywereabletoseethestressfuleventaschallengingratherthanthreatening.FinallyaskyourselfHowwouldIfeelaboutthisoneweekfromnowortenyearsfromnow?Thisformofmentaltimetravelmaybeeffectivebecauseourattentionisdirectedawayfromourimmediateconcretecircumstances. 1Whatisself﹣distancing? A.Gettingstuckinnegativeemotions. B.Astressfulsituation. C.Astudyonrelievingemotionalstress. D.Reflectingonyourselfobjectively. 2Paragraph2isdevelopedby. A.example B.definition C.classification D.process 3Whichofthefollowingstatementusesthetechniquesofself﹣distancing? A.I'mangrywithhim. B.HowIwishIcouldgobacktothepast! C.Howdidthesetwopeoplegettothispoint? D.Hegrabbedmynotesandthenandthen… 4Whatisthebesttitleforthepassage? A.WhySelf﹣distancingMatters B.TheApplicationofSelf﹣distancing C.BreakingtheCycleofNegativeReflection D.WaystoReflectonEmotionalReactions
GrowingupinKenyawasamazingbecauseIlearnedsomuchthoughthepovertyandlackofresourcesweresometimesfrustrating.IknewIdidn'thavemuchbutIwas1. TherewasonlyonethingIwasn'thappywith2.Iwantedtogotohighschoolanduniversity.Ihadthedrivethewillandthegrades3Ididn'thavetheresources.Even4thingslikefoodwaterandshelterweren'treadilyavailable.Youngpeopleinpovertyhavelittleorno5tohighschoolsanduniversities.WhereIliveditwaschallenging6someonehelped.WhenIleftprimaryschoolIwasinthesame7asmanyotherpoordisadvantagedyouth.8duringthatyearacharitablehighschoolforgirlsStareheGirlsCentrewas9andIreceivedascholarship.TodayIam10recordasbeingthefirststudenttobeenrolledinthisschool. In2006myschool11TheGlobalGiveBackCircleanot﹣for﹣profitorganizationfor12disadvantagedgirlstocompletetheireducationandgain13skills.AftergraduatingfromhighschoolIwasgivenaccesstoanine﹣monthITcourse.14itsgive﹣backattitudehadtaughtustonotonlycareaboutourselvesbutotherpeople.Withthisinmind10ofuscreatedawebsitecalledHeySisterGetClued﹣Up.Throughthiseducationalwebsiteaimedatnetworking10000African15worldwideallSisterscommittosendinginformationtotheirvillages.Thiscanbeto16financialfreedomadvanceinformation17tohealthissuesandprovideknowledgeaboutsocialnetworkingbehavior. HeySisterGetClued﹣Upisonly18tothosegirlswhocanaccesstheInternetwhichhighlightsthehugechallengein19thedividebetweenthehavesandhave﹣nots.Butourplanisthatthesegirlswill20whattheylearntoothergirlsthroughthepoweroftheirvoice. 1A.energetic B.happy C.confident D.hopeful 2A.status B.college C.entertainment D.education 3A.so B.and C.but D.since 4A.cheap B.basic C.important D.simple 5A.access B.means C.chance D.dream 6A.so B.when C.as D.unless 7A.occasion B.situation C.dilemma D.position 8A.Generally B.Importantly C.Luckily D.Casually 9A.putup B.takenup C.madeup D.setup 10A.on B.in C.at D.for 11A.approved B.took C.joined D.launched 12A.psychologically B.physically C.educationally D.financially 13A.social B.average C.typical D.professional 14A.Inshort B.Inall C.Inaddition D.Inbrief 15A.students B.girls C.kids D.teenagers 16A.promote B.introduce C.employ D.present 17A.attached B.compared C.related D.devoted 18A.alternative B.acceptable C.appropriate D.available 19A.narrowing B.shortening C.declining D.changing 20A.encourage B.spread C.add D.apply
IfeelthatIwasblessedbyanAngelnotlongago.Weliveinasmalltownwherelifeispeaceful.AfewdaysbeforeChristmasIwasoutintownshoppingwithmyhusband.Becauseofthecoldmyfingershrankcausingmyanniversaryringtofalloff.Ididn'tnoticethisuntilwegothome.Ibecamephysicallyill.Ithoughtmyhusbandwasgoingtohaveaheartattack. Yesitisamaterialitembutitisalsoaverysentimental情感的item.Hewentoutandretracedoursteps.Icalledthestoreswewereinandnooneturneditin.Ithoughtitwasgoneforsure.Wellataroundmidnightlastnightourdogsbecamecrazybarkingnervously.Wehaveasunroomthatisattachedtoourhome.Thedoortothatisusuallylocked.Apparentlyweleftitunlocked. Mymotorbikewasparkedoutthere.Initsbasketwasaringbox…holdingmyring!Alongwiththeringwasaband.Itwasahalfsizesmallerthanmyring. Therewasalsoanotethattoldthestoryofthisstrangerfindingtheringandrecognizingtheworkasitwasacustompiece.Thepersonthenwenttothejewelerandexplainedaboutfindingthering. Thejewelerwasafriendofminesoshegavehermynameandasthetownwassosmallwewereeasytofind.Thestrangerwhofoundtheringpurchasedthebandinordertokeeptheringinplacewhenitwascoldout.AndshealsoleftagiftcardforustotakeourfamilyouttothemoviesasaChristmasgift.ThenotewassignedSanta.Myfriendiskeepingherlipssealedaboutwhomitwas. 1Whatdidtheauthordowhenshefoundherringlost? A.Sheblamedherhusbandforlosingit. B.Shetelephonedtheshopstheyhadbeenin. C.Shewasphysicallyillduetotheheartattack. D.Shewentbackalongthesamewaytosearchforit. 2Howdidtheauthorgetthelostringback? A.Thedogdiscovereditinthestore. B.Herfriendfounditinthesunroom. C.Ajewelerpurchaseditfromsomeone. D.Astrangersentitbackwithoutbeingnoticed. 3Whichofthefollowingwordscanbestdescribethestranger? A.Intelligentanddiligent. B.Ambitiousandgenerous. C.Courageousandenergetic. D.Selflessandconsiderate.
假定你是李华你们班级的节目哈姆雷特Hamlet将参加下个月学校英语文化节话剧drama比赛你给度假中的外教Mr.Hurst写一封电子邮件并附上节目录像请他给予你相关的指导. 注意 1词数100左右 2可适当增加细节以使行文连贯 3邮件的开头和结尾已为你写好. DearMr.Hurst Yours LiHua.
Thisyeartheheadmasteroftheschoolrecommendedabooktous.ThebookisTheElement:HowFindingYourPassionChangesEverythingbyRobinson.TheElement元素1thepointatwhichthethingsweare2aboutandthethingswearegoodatcometogether.Theauthorsaysitis3tofindourElementnotjustforourown4butfortheimprovementofourworld. MickFleetwoodisoneofthemostfamousrockdrummersintheworld.5thetestsshowedhisintelligencewaslowwhenhewasinschool.Hismindwouldgo6whenhisteacheraskedhimtorecitethealphabetbackwards.7Mick'slearningdisabilitydoesn't8hiswaytosuccess.Hecomesfromahomewherehisparentscouldseewhatis9hislimitsandunderstandthepoor10performancehardlydooms注定onetofailure. Mick'slowscoredidn't11hisparents.Theyknew12himfromschoolandtheteststhat13onlyanarrowrangeofintelligencemaybethepathtoasuccessfulcareer.Insteadof14Mickasalosertheyunderstandthathehasagreattalentforsomethingthatascoreonatestcannever15. Inschoolthereisanefforttohelpstudents16whattalentstheyhave.ButthisisonlyonepieceofthePuzzle17isstressedbyRobinson.Theotherpieceisfinding18aperson'stalentandtheloveof19thattalentintersect交又. IhaveenjoyedthisbookandIreally20theguidanceofthisbook. 1A.refersto B.attachesto C.belongsto D.turnsto 2A.particular B.anxious C.certain D.enthusiastic 3A.reasonable B.natural C.vital D.convenient 4A.agreements B.arrangements C.qualification D.accomplishment 5A.instead B.However C.Moreover D.Therefore 6A.blank B.wrong C.bad D.mad 7A.Honestly B.Actually C.Fortunately D.Obviously 8A.cutdown B.cutaway C.cutthrough D.cutoff 9A.beneath B.within C.across D.beyond 10A.physical B.mental C.academic D.daily 11A.amuse B.annoy C.affect D.alarm 12A.defending B.withdrawing C.prohibiting D.discouraging 13A.describe B.evaluate C.adjust D.convey 14A.selecting B.appointing C.classifying D.recommending 15A.indicate B.distribute C.acquire D.circulate 16A.pickout B.figureout C.carryout D.pointout 17A.where B.that C.which D.as 18A.how B.where C.why D.what 19A.preparing B.correcting C.exercising D.accelerating 20A.acknowledge B.benefit C.admit D.strike
AsnewteachersintheEmirati阿联酋schoolweWesternersgreetedAlyiaeveryday.Sheignoredusasshe1handswithallthenonWesternersinourstaffroom.Wheneverwesawhershe2eyecontactwithus. Wellafter16monthsintheschoolwehadasecretpalgifting.I3hernamefromtheglassjarandthatmeantshewasmysecretpal.My4wastobuyheragiftandsaysomethingaboutherwhenwepublicly5whooursecretpalwas. IboughtherasmallrosearrangementandaskedoneoftheEmiratistowritealittle6onitandthensentittoherroom.Shewasso7thatsheputitononeappusedbynonWesterners.ThenIrealisedshewillnotthinkIamaWesterner8themessagewasinArabic. ThenextdayIsentashampoobutIwrotethemessagein9.SheneededtoknowhersecretpalwasaWesternerbeforethedayofthebigrevealsothatshewas10.Iwonderedhowshewould11whensherealisedthesewerefromoneoftheWesternersshe12ignored. Thencamethedayofthereveal.IputasilvernecklaceinagiftboxwiththeUKshopnameonit.Shetaught13intheschoolsoIsaidMysecretpalissomeonewhobringsmusictoourears.Withahugewarm14shehuggedmeandkissedmeonbothcheeksandacceptedmy15.Sincethenshesmilesoften.Wehugshakehandsanditis16.Ihaveseenher17mygiftseveraltimesandIamsopleased.OneofmyWesterncolleaguestoldmethatshetoois18fromthischangeinattitude. Ireachedoutmyhandinfriendshipand19hopingtobebefriendedand20Ihavebeenmetwithloveandfriendship. 1A.clapped B.shook C.seized D.raised 2A.made B.received C.avoided D.forbade 3A.drew B.chose C.dragged D.pushed 4A.goal B.role C.demand D.decision 5A.denied B.explained C.discovered D.acknowledged 6A.idea B.notice C.message D.information 7A.shocked B.touched C.amused D.annoyed 8A.as B.if C.unless D.though 9A.French B.German C.Arabic D.English 10A.expected B.concerned C.prepared D.struck 11A.react B.reply C.reflect D.regret 12A.casually B.kindly C.intentionally D.eventually 13A.history B.music C.maths D.geography 14A.smile B.atmosphere C.jar D.box 15A.greeting B.praise C.advice D.gift 16A.awful B.helpful C.confusing D.beautiful 17A.wear B.hang C.put D.lift 18A.learning B.benefiting C.suffering D.differing 19A.sympathy B.reward C.pride D.dignity 20A.inturn B.inexchange C.inreturn D.infact
Withtheirpipesandlidstoavoidspillscoffeecupshavelongbeenthesubstituteforadults.NowStarbucksisgoingallinontheconceptbyswearingtogetridofstrawsby2020﹣﹣andit'sallforaverygoodreason.Thismoveisananswertoourownpartnersaboutwhatwecandotoreducetheneedforstraws.Notusingastrawisthebestthingwecandofortheenvironment.InplaceofplasticstrawsStarbucksplanstoofferrecyclablelidsforalliceddrinksandperstrawsforcoffee.ThetransitionisalreadytakingplaceinStarbucks'hometownofSeattlewhereabanonplasticstrawswentintoplaceonJulyI.Byrollinghistnl2800ofherorsby2020ecompsaystheyareannuallyremovingmorethanonebillionstrawsfromgoingintocirculation﹣andpotentiallytheocean.Starbucks'decisiontograduallystopusingsingle﹣useplasticstrawsisashiningexampleoftheimportantrolethatcompaniescanplayinstoppingthetideofoceanplastic.Witheightmillionmetrictonsofplasticenteringtheoceaneveryyearwecannotaffordtoletindustrysitonthesidelines.Marinelifehasa50%deathratewhenitswallowsplasticyetresearchersbelievetherewillbemoreplasticintheoceanthanfishbytheyear2050ifthisrateoflittercontinues.Thatmeanstherecanbeanimmediatepositiveimpactifweswapplasticstrawsforenvironmentallyfriendlyalternatives.ThesmartdesignonthecupforcolddrinkscomesfromStarbucks'in﹣houseteamofdesignersandhasbeenindevelopmentfortwoyears.Howevertheannouncementcomesasoutcry倒彩increasesoverthedangersthatplasticstrawscancausetomarinelife.Othercompaniesmakingtheeco﹣friendlyswapalsoannouncedplanslastmonthtotestalternativestoplasticstraws.1WhydoesStarbucksdecidetogetridofplasticstraws?A.Todecreaseitscost.B.Tosatisfythecustomers'needs.C.Tocreateagreenerplanet.D.Toenlargeitsbusinessworldwide.2Theunderlinedword'transition'inparagraph2refersto.A.courseB.changeC.circulation.D.conflict.3What'sthetextmainlyabout?A.Starbucksisthrowingawayplasticstrawsforaworthycause.B.AsalespromotionofanewbrandbyStarbucksisbeingdoneC.Scientistsaremakingeffortstosolveoceanplasticpollution.D.Environmentallyfriendlymaterialwillreplaceplasticstraws
OnedaywhenIwasaboutnineyearsoldIranintomymother'sbedroomandopenedthedresser.Theninthetopdrawerwasasmall1jewelrybox.Iwasfascinatedbyitstreasures.ThenIsawtherewassomething2underapieceofcloth.3theclothIfoundalittlewhitechipofchina.Whydidmymotherkeepsucha4thing?Shiningslightlyinthelightit5noanswers. SomemonthslaterIwassettingthedinnertablewhenmyneighborMargeknockedatthedoor.Cominginand6thetableMargesaidOhyouareexpectingcompany.I'll7anothertime. NocomeoninMumreplied.Wearenot8anyone. Butisn'tthatyourgoodchina?Margeasked.I'd9trustkidstohandlemygooddishes! Mumlaughed.Tonight'smyfamily'sfavoritemeal.Ifyousetyourbesttableforan10mealwithguestswhynotforyourown11?Afewbrokenplatesareasmall12topayforthejoyweget.Thensheadded13everychipandcrackhasastorytotell. Mumwenttothecupboardandtookdownaplate.ShesaidSeeingthis14ontheedgehere?IthappenedwhenIwas17. Hervoice15.Onedaymybrotherinvitedayoungmantodinnerandsathimnexttome.Iwasso16thatwhenItooktheplateit17andknockedagainstthefork.Astheyoungmanwasleavinghe18apieceofbrokenchinainmyhandwithoutsayingaword. Icouldn'tforgetaboutthatplatewiththe19chip.Iwentuptotakeoutthelittlewoodenjewelryboxagain.Iexaminedthechip20.Thechipwhichmymotherhadsavedwithcarebelongedtotheplateshebrokeonthedayshemetmyfather. 1A.silver B.gold C.china D.wooden 2A.hidden B.unpaid C.removed D.fixed 3A.Covering B.Tearing C.Seeking D.Lifting 4A.broken B.genuine C.beautiful D.valuable 5A.found B.invented C.offered D.selected 6A.glaringat B.glancingat C.lookingon D.spyingon 7A.goby B.passby C.stopby D.standby 8A.inviting B.expecting C.consulting D.celebrating 9A.always B.sometimes C.never D.regularly 10A.common B.strange C.unbelievable D.special 11A.family B.relative C.neighbor D.ancestor 12A.value B.fault C.bet D.price 13A.However B.Though C.Besides D.Otherwise 14A.break B.scene C.spot D.design 15A.hardened B.softened C.sharpened D.weakened 16A.nervous B.anxious C.surprised D.pleased 17A.jumped B.escaped C.slipped D.left 18A.threw B.laid C.examined D.picked 19A.replaced B.penniless C.remaining D.missing 20A.secretly B.carefully C.gratefully D.proudly
某研究小组切取某种植物胚芽鞘的顶端分成甲乙两组按下图所示的方法用琼脂块收集生长素再将含有生长素的琼脂块置于去顶胚芽鞘切段的一侧一段时间后测量胚芽鞘切段的弯曲程度α角测得数据如下表据此回答问题. 1生长素在胚芽鞘中的运输属于极性运输这种运输的方向是. 2上图中α角形成的原因是. 3据表可知乙组中左右两侧的琼脂块所引起的α角基本相同但小于甲琼脂块所引起的α角原因是.
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