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在区间[1,6]上随机选取一个数a,则a≤3的概率为( )
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高一下学期数学《》真题及答案
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在区间[-12]上随机取一个数x则x∈[01]的概率为________.
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效应T细胞可通过细胞膜上TCR受体识别肿瘤细胞上的相应抗原并进行攻击如图1而肿瘤细胞可通过某种机制逃避机体免疫系统的识别攻击以实现免疫逃逸.请回答 1图1体现了细胞间的信息交流.效应T细胞识别肿瘤细胞过程中发出信号的细胞是该图也体现了免疫系统的功能. 2研究发现在肿瘤发展过程中肿瘤细胞表达出PD﹣L1蛋白与PD﹣1受体结合从而抑制效应T细胞的免疫功能实现了免疫逃逸如图2. ①利用肿瘤移植技术基因敲除技术通过一定的途径使机体特定的基因失活或缺失的技术以健康小鼠为实验动物设计实验验证该肿瘤细胞的免疫逃逸机制.请写出实验思路.. ②为进一步验证该机制可另设计一实验组即对健康小鼠进行然后注射抗PD﹣L1抗体.实验中注射该抗体的目的是. 3研究发现癌细胞会召集大量Treg细胞进入肿瘤中导致肿瘤生长.Treg细胞表面能持续性的表达CTLA﹣4抑制T细胞活化并使T细胞分泌IL﹣2的能力降低IL﹣2可促进T细胞增殖.在临床试验中尝试采用诱导Treg细胞凋亡的方法治疗癌症但患者的病情并没有得到改善.科研人员研究了3种细胞对T细胞分泌IL﹣2的影响.结果如图3 由图结果推测导致临床治疗效果不佳的原因是.
果绳的体色灰身和黑身受一对等位基因控制用A和a表示其眼色受另一对等位基因控制用B和b表示.现有两只雌雄果蝇作为亲本进行杂交杂交后代F1的表现型及比例为灰身白眼雄性灰身红眼雌性黑身白眼雄性黑身红眼雌性=3311.请回答下列问题 1果蝇的体色和眼色遗传是/否遵循基因自由组合规律. 2亲本果蝇的基因型为选择F1的灰身雌雄果进行自由交配则交配后代中Xb的基因频率为. 3若F1中出现了一只眼色基因型为XBXbY的红眼雌性果蝇则产生异常配子的是填“父方”“母方”或“父母双方都可能产生的原因是.
There'snodoubt﹣thatlearningaforeignlanguageisdifficultandwhenitcomestospeakinginthelanguageitcanberatherterrifying.Irememberwalkingintomyfirst﹣everSpanishclassatuniversityonlytodiscoverthathalfofmyclassmateswerealreadyfluentinseverallanguages.1 AtfirstthethoughtofspeakinginSpanishterrifiedme;notonlyweremyvocabularyandgrammarverylimitedbutIhadneverspokenanotherlanguagebefore.ButIwasdeterminedtoovercomemyfearandbyemployingafewsimplestrategies策略Ihavebeenabletobuildmyconfidenceanddevelopatmyownpace.2 FirstlyrememberitisOKtomakemistakesandthatyoushouldfacethem3Butwhenitcomestolanguagelearningweoftenaimforperfectionandfeelasthoughwearenotreadytospeakuntilwehaveenoughwordsorgrammaticalknowledge.Thetruthisthatyouwillneverfeelreadyandinsteaditisimportanttousetheknowledgethatyoudohavetocommunicatewhatyoucan. Thisleadsontomynexttip:4Thiscanbeahardoneespeciallyifyouareinalargelanguageclass.Itisimportanttorememberthatwealllearnatdifferentspeedsandthroughdifferentstylesoflearning.Byallmeanskeepupwithyourclassmaterialbutdonotworryifyoudon'tunderstandeverything﹣especiallyintheearlystages. Lastlycelebratethesmallsuccessesandrememberhowfaryouhavecome!5Soinsteadoffocusingonhowforyouhavetogofocusontheprogressyouhavealreadymadeandbeproudofyourachievements! A.Thissoundsobvious. B.It'shardlydifficulttodoso. C.Ifeltitwasreallyoutofmyreach. D.Don'tcompareyourselfwithothers. E.Trytokeepupwithotherclassmates. F.Afteralleverytinysuccessandlittleprogressisworthcheeringfor. G.SoIwillshareafewtipswithyouhopingthatyoufindthemusefultoo.
Doyouknowtheoriginoflifeontheearth?It'swidelyacceptedthattheuniverse1beginwithaBigBang.Afterthattheearthwasstilljustacloudofdust.Ittookseveralbillionyears2thedustsettledintoasolidglobe.Theearthbecameso3violencethatitexplodedloudlywhichproducedcarbondioxidewatervaporandothergases.Withtheearth4cooldownwaterthenappeared5continuedpresencemadeitpossibleforlifetodevelop・Manymillionsofyearslatertheappearanceofthe6extremesmallplantsandtheoxygentheyproducedencouragedthedevelopmentofallsortsoffish.Nextamphibiansreptilesanddinosaursappearedoneafter7.Thesuddendisappearanceofdinosaurscausedtheriseofmammalswhichweredifferentfromalllife8forminthepast.Finallyhumansappearedandspreadaroundtheglobe.Theyarenottakinggoodcareoftheearthnow.Theyareproducingtoomuchcarbondioxidecausingtheearthtoohottolive9.Thereforeit'sourresponsibility10solvetheproblem.
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研究发现四倍体草莓叶绿素含量比二倍体草莓高.如图表示夏季晴天二倍体和四倍体草莓叶片净光合速率的日变化.下列分析错误的是
高血压是一种以动脉压升高为特征可伴有心脏血管脑和肾脏等器官功能性或器质性改变的全身性疾病长期的精神紧张激动焦虑以及Ⅱ型糖尿病甲状腺疾病等都可能引起高血压的发生.请回答下列问题 1肾上腺的髓质分泌肾上腺素它的分泌活动受内脏神经的直接支配长期的精神紧张激动焦虑等紧急情况下肾上腺素的分泌增加人表现为警性提高反应灵敏心率加快等特征分析这些例子说明神经调节和体液调节之间的关系是. 2Ⅱ型糖尿病常见于中老年人患者血清中胰岛素的水平早期正常或增高晚期低下.胰岛素的生理功能是 . 3内分泌腺没有导管分泌的激素弥散到体液中随着血液流到. 4脑梗是老年人常见病发烧是导致脑梗发生的诱因高温持续期人体产热量“大于”“小于“等于”散量热量的来源主要是.
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Doyouwantyourparentstobeproudofyou?Doyouwantthemtotrustyouthemostandbelievethattheycancountonyou?Doyouwanttobetherolemodelofgoodbehavior?Beingresponsibleistheanswer.Thenhowtoberesponsible? 1. Parentslovetoseecleanroomsorganizedclosetsandfloorsthatdon'thavepilesofthingsonthem.Doalittlebitofcleaningeachdaysoitisneveroverwhelming. Trysettingasideatimetodofiveminutesofcleaningsuchasaftersuppereachevening. Dresswellandtakegoodcareofyourbody. Findyourownpersonalstyle:cutepreppygirlyboyishseriousorwhimsical.Whateveryourstyleyourclothesshouldbeneat.Brushyourhairandteethstaycleanand2.Thiswillhelpyoulookandfeellikeanangelchild. Stayontopofyourresponsibilities. Doyourhomeworkassoonasyoucomehomewhichwillpleaseyourparentsandgiveyoutherestofthedayfree.Puteffortintoyourschoolworkandgetthebestgradesyoucan. Ifyouneedhelpaskforit!Thiswon'tbotheryourparents﹣3 Getplentyofsleepeatwellandspendtimeoutdoors.Thisshowsyourparentsthattheytaughtyouwell. Acknowledgeyourmistakes. Blamingotherpeopleisimmatureandparentscanusuallytellwhenyou'redoingit.InsteadgotoyourparentsandsayItwasmyfaultandIamsorry.Evenifthey'reunhappyaboutyourmistake4Butdon'tbackanswertheycansurelygetangryandwouldalwayspointoutyourmistakesthenexttime.Socontrolyourselfandstaycalmeveninthetimeofworstsituations. Keepyourpromises. Ifyouofferedtohelpdowhatyousaidyou'ddo.5andthey'lltrustyouwhenitcomestotheimportantthings.Ifyouaren'tsurewhetheryoucandosomethingdon'tpromisetodoit.InsteadsayIthinkIcanorI'lltry. A.Dowhattheyaskyoutodowithouttalkingback. B.Eatfruitsandvegetable. C.Yourparentswilllovetoseeyoubeingkind. D.Itshowsthemthatyoucare. E.Theywillbeproudofyouforowninguptoit. F.Parentsappreciatereliability. G.Stayneatandorganized
2018年12月1日是第31个“世界艾滋病日”我国的主题为“主动检测知艾防艾共享健康”.明确检测是知晓艾滋病感染状况的唯一途径而明确感染状况又是有效治疗的前提.下列有关HIV的叙述正确的是
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虎皮鹦鹉性别决定为ZW型羽毛颜色丰富黄色绿色蓝色的遗传机理如图所示其中A基因位于1号常染色体上酶A酶B均不能合成时表现为白色.据此分析下列问题 1两只蓝色虎皮鹦鹉交配后代表现蓝色和白色这种现象在遗传学上称为.子代蓝色虎皮鹦鹉的基因型是. 2欲利用一只纯合蓝色雄性虎皮鹦鹉确定Bb基因的位置请从纯合的黄色白色蓝色绿色四个品种中选择实验材料对实验方案进行补充完善不考虑交叉互换. 选取品种与该蓝色雄性鹦鹉交配观察子代雌雄个体的毛色. 若F1表现为则该基因位于Z染色体上 若F1表现为则该基因位于常染色体上. 再让F1雌雄个体相互交配若F2表现型及其比例为蓝绿黄=121则该基因也位于1号染色体上 若F2表现型及其比例为则该基因位于其他常染色体上.
阅读下面短文根据所给情节进行续写使之构成一个完整的故事. Iwasdoingabigclean﹣uprecentlyandmykidswerehelpingwhenmysonFreddocameacrossaknottedhandkerchiefwithanolddarkbrowncoininside.MumcanIhavethis?CanIplaywiththiscoinheasked.Itookonelookandwasimmediatelytransportedtoanothertime. In1991therewasatimewhenmyfriendandIworkedinabackwardAfricancountryNigerhitbysandstormsandburningheat.ThereweremanythingsIfounddifficultaboutthisplace﹣﹣theclimateandbeggarsweremybiggestheadaches.SoafterfinishingfivemonthsofnursingworktherewemovedontoworkatahealthclinicinneighbouringcountryBurkinaFaso.It'smuchgreenerinBurkina.EventheCoketastesbetterthelocalsassuredus. Yetthefactwasquitetheopposite.ArrivingbytaxiatourdestinationinBurkinawebegantounload.Iwasreachingformylargerpieceofluggagewhenoutofthedarknessamotorbikewithtwomenapproachedslowly.Withoutwarningoneofthemengrabbedmydaypackasthemotorbikesweptcloseby.Withinsecondsthepairwereoutofsightswallowedupbythenight. Withmypassportmoneytraveller'schequesallinthebagIwasindeeptrouble.Howfrustrating!AllIwantedwastoleavethishellhole!ThenwalkingthroughBurkina'sstreetsonedayIwasstoppedbyanoldwomanwhothrustherhandinmyface.Cadeau'gift'inFrench!Cadeau!shecried.I'dhadenough!Iwasextremelytiredofthecountry:itspovertyitsthievestheheatthedustand…everything!ItoldherangrilyandfirmlyinFrenchIhaveno'Cadeau'.Ihavenomoney.AthiefstoleallmymoneytwoweeksagoandnowIcan'tgetoutofyourcountry.Icannotgiveyouanything.NOTHING!'Thebeggarwomanlistenedattentively.Tomygreatsurpriseafterhearingmywordsshegaveabroadsmile. 注意:1.所续写的短文的词数应为150词左右; 2.应使用5个以上短文中标有下划线的关键词语; 3.续写部分分为两段每段的开头语已为你写好; 4.续写完成后请用下划线标出你所使用的关键词语. Shereachedintothepocketofherdress. Therewasaslighttouchonmyhand;lookingdownIsawmysonlookingatmecurious.
乙型肝炎病毒HBV可引发慢性肝炎肝硬化等疾病乙型肝炎病毒调节蛋白HBx对HBV复制有重要作用.图1表示在PCR过程中HBx基因与引物的关系图2表示利用中国仓鼠生产乙肝病毒HBx蛋白流程图.回答下列问题 1利用PCR技术扩增图1中HBx基因时在第次循环结束后即可出现两条链等长的目的基因片段.图2中②过程需要用到限制酶和DNA连接酶两种酶作用的化学键填“相同”或“不相同”. 2基因表达载体导入受精卵常用法检测HBx基因是否转录出mRNA时需要用做探针再与相应的物质杂交. 3④过程体外受精前需要对精子进行处理卵母细胞需要发育到期才具备与精子受精的能力.⑤过程将获得的早期胚胎移植到经过处理的受体仓鼠子宫内. 4在⑤步聚操作前对胚胎进行了检查和筛选发现有些胚胎因为外源基因的插入而死亡外源基因插入导致胚胎死亡的原因可能是.
汤姆因没有准时出现在玛丽的生日聚会上而向她道了歉.apologizeturnup
稳态是人体进行正常生命活动的必要条件请据图回答下列问题 1正常机体血液中②的含量变化受①③的调节这种体液调控机制为调节.图中虚线是指当②含量增加到一定程度时下丘脑和垂体分泌相关激素. 2在寒冷环境中人体仍保持体温平衡原因之一是神经末梢支配图中的答出两种器官分泌激素增多. 3图中⑤所代表的免疫活性物质有至少答出两种. 4内环境的各种和会不断变化导致该变化的原因是外界环境因素的变化和体内细胞代谢活动的结果.
2018全球癌症统计数据显示肺癌女性乳腺癌结肠直肠癌已成为全球发病率最高的三种癌症.脂质体是由脂质双分子层构成的闭合球形囊泡在治疗癌症方面起到定的作用.回答下列问题 1将抗癌药物包埋于脂质体内将单克隆抗体连接在脂质体膜上.单克隆抗体可以与癌细胞表面的结合用于癌症的靶向治疗.单克隆抗体最广泛的途是用作. 2在基因工程中利用脂质体膜的流动性将包埋于脂质体内从而使外源基因导人受体细胞内. 3研究发现奥曲肽能够抑制癌细胞增殖.下面表示不同浓度的奥曲肽处理组分别培养24h48h72h测定细胞生长情况计算抑制率. ①由上图结果可知奥曲肽作用h抑制效果最显著.奥曲肽对癌细胞的抑制率受影响. ②在培养过程中癌细胞虽然不具有的生长特点但应定期以便清除代谢产物. ③从红豆杉树皮中分离出高抗癌活性的紫杉醇为实现工厂化生产可以通过技术来大量生产抗癌物质﹣﹣紫杉醇写出生产过程图.
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Twoladieslivinginoppositeapartmentssayhellowhentheymeeteachotherinthecorridor.OneofthemsaysImovedherefiveyearsago1Inevermetyoubefore.CouldIaskyournameplease?TheothersaysI2behereforsixyears.HowshouldIcallyou? Itseemsveryridiculous3peoplelivingsoneardon'tknoweachotherforsuchalongtime.HoweverYoucanfindthiskindofstory4performeverywhere.Itistheexact5reflectofinterpersonalrelationshipsinthemodernworld.Inthemodernworldmostpeopleliveinapartments.Theyclosetheirdoorsandnevergooutassoonastheygethomefromwork.Iftheylivealonetheywillkilltheir6watchingTVorreadingmagazines.Theydon'thaveanyconnectionsevenwiththeir7closeneighborswhoseemnodifferentfrompeopletheymeeteverydayin8street. Thisphenomenonisnogoodtousnortooursociety.Peoplewillfeelmoreandmorelonely.Theworldbecomessoindifferent.It'stimethatwe9takesomemeasurestoimproveit.Peoplelivinginthesameplacecan10organizetohavesomeactivities.Weshouldcallonpeopletobefriendlytoeachother.
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LONDON﹣BritainpreparesforavoteThursdaythatwilldecidewhetheritleavestheEuropeanUnion.Thedebatehascenteredonimmigrationandeconomicsecurity.Bothsideshaveloweredthetoneoftheirargumentsafterathree﹣daysuspension暂停ofcampaigningthatfollowedthemurderofananti﹣Brexitlawmakeranincidentthatpolls民意调查suggesthasshockedmanypreviouslyundecidedvoterswhonowsaytheywillvotetoremain. TheseareuncertaintimesinanationwhoseeconomyisthesecondlargestintheEuropeanUnion.Therisksarehuge.Therearewarningsthatleavingthe28﹣membergroupmaycausetheBritishpoundtolose15percentofitsvalueandbringtheresignation辞职ofDavidCameronthecountry'sprimeminister;hisstayornotdependsonwhetherBritainlistenstohimandvotestoremain. FormonthstheLeavecampaignhasbeenhittingthestreets.Itsargumentsarebasedlargelyon immigrationandthebeliefthatBritainhashandedcontrolofitsborders边界toaEuropeansuperstate:TheU.K.haslostcontrolovermigration.WehavetoacceptanyoneintothiscountryiftheyhaveanEUpassportnomatteriftheyhaveacriminalrecordornot.Wearenotallowedtosay'no'topeopleandthatisdamagingforthesecurityoftheU.K.butitisalsoputtingpressureonjobsandopportunitiesforyoungpeoplesaidTomHarwoodaBrexitcampaigner. ThemurderofJoCoxananti﹣Brexitpro﹣immigrantlawmakerbyafarrightextremist极端分子withahistoryofmentalproblemshadaseriouseffectonbothcampaignsandonvoters. PollssincetheJune16thmurdershowedtheLeavecamplosinggroundbutwithbothsidesstillverycloseonareferendum全民投票thatmanybelievecouldchangethecourseofEuropeanhistory. 1WhatdoestheunderlinedwordBrexitinparagraph3mean?. A.BreakthelawoftheEuropeanUnion. B.BreakawayfromtheEuropeanUnion. C.BuildtheexittotheEuropeanUnion. D.BantheimmigrationintoBritain. 2Whatisimpliedfromthepassage? A.TheimmigrationhascausedgreatconcerninBritain. B.BrexitwillbegoodforBritisheconomy. C.Bothcampshavebeencampaigninganddebatingonthestreetsformonths. D.ThemurderofJoCoxmademanyvotersdeterminedtovotefortheexit. 3Whichofthefollowingstatementistrue? A.BritainwillleavetheEuropeanUnionafterthevote. B.AnyonewithapassportcanchoosetostayandworkinBritain. C.WhetherCameronwillresigndependsontheresultofthereferendum. D.JoCoxwasmurderedbyaBrexitcampaignerinJune16m. 4What'stheattitudeofthereporttotheeventofBrexit? A.Positive B.Negative C.Indifferent漠不关心的 D.Concerned
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假定你是晨光中学的李华来自英国CaterhamSchool的一批学生来你校与同学们开展了为期一周的文化交流活动.请你给校园英文报写一篇报道.内容包括: 1.活动时间:6月24日一6月30日; 2.活动内容:如画作展出音乐表演等; 3.活动意义. 注意: 1.词数80左右题目已为你写好; 2.可适当增加细节以使行文连贯. CulturalExchangebetweenCaterhamSchoolandChenguangHighSchool
下列与物质运输有关的叙述错误的是
以下有关实验的叙述错误的是
美国白蛾是一种严重危害果林木农作物的食叶性害虫自入侵以来对我国多个省市造成了严重危害.周氏啮小蜂能将产卵器刺入美国白蛾等害虫坚硬的蛹表皮将卵产在蛹内并在蛹内发育成长吸尽蛹中全部营养从而杀死美国白蛾等害虫.核型多角体病毒HcNPV可以通过侵染美国白蛾幼虫使其部分死亡. 1在生态系统组成成分中美国白蛾属于HcNPV与美国白蛾的种间关系是. 2科研人员分别对放蜂区按比例释放一定数量的周氏啮小蜂不用农药和对照区常规农药防治美国白蛾蛹被周氏啮小蜂和其他天敌寄生的情况进行了调查结果如下图 统计数据发现放蜂区其他天敌对美国白蛾蛹的寄生率升高可能原因是. 3为取得更好的防治效果科研人员计划使用HcNPV和周氏啮小蜂共同防蛾.假设“带毒蛹”被HcNPV感染的虫蛹对周氏啮小蜂的繁殖没有影响.为验证该假设设计了如下实验方案.请在下列选项中选择a~f填入①~④处选择g~i填入⑤处. a.“带毒”美国白蛾成虫b.“带毒”美国白蛾蛹 c.“不带毒”美国白蛾成虫d.“不带毒”美国白蛾蛹 e.HcNPV病毒f.周氏啮小蜂g.总出蜂量h.雌蜂量i.雌雄蜂寿命 若实验结果为则二者可以共同用于同一区域美国白蛾的防治.
一个基因型为AaXBY的精原细胞进行减数分裂MⅠ和MⅡ分别代表减数第一次分裂和减数第二次分裂.下列有关叙述错误的是
Ittakesabigbrain﹣ahumanbrain﹣todomath.Orsoyoumightthink.Butscientistshavefoundthatotheranimalssuchaschimpanzeesmonkeysandevenpigeonscandosomeadditionandsubtraction减法.Nownewresearchshowsthathoneybees﹣withbrainsthesizeofsesameseeds﹣candobasicmath. Researchersputhoneybeesthrough100trialstotrainthemtoaddandsubtract.TheyfirstputthebeesinaY﹣shapedmaze迷宫andpresentedthemwithacertainnumberofeitheryelloworblueshapes.Yellowshowedthebeesshouldsubtractwhilebluemeanttheyshouldadd. Thebeesthenenteredthedecisionroomwheretheywerepresentedwithacorrectanswerononesideandanincorrectanswerontheotherside.Iftheypickedtherightanswertheywererewardedwithasugarydrink.Ifnottheygotbitterwater.Theresearchersalsoputthebeesthroughanothertesttrialwithoutarewardorpunishmenttomakesurethereweren'tanysmellmarksinfluencingthebees'choices. Atfirstthebeespickedanswersrandomly随意地.Youseethattheabilityofthebeestodoitstartsataboutchancelevel50%showingusthebeesarejustchoosingatrandom.Overtimetheirabilitycomesuptoabout80%sotheyactuallystarttoperformquitewell. ScarlettHowardoneofthestudyauthorsandaresearcheratPaulSabatierUniversityinFrancesaysthebeeswereevenabletoaddandsubtractcorrectlywhenpresentedwithanumbertheyhadneverseenbefore.ThestudyisinthejournalScienceAdvances.Thingslikethisletusknowthere'realotofmysteriestobeexploredthereandtheirbrainsmightnotbeassimplisticasweoncethought.Howardadded. 1thetesttrialonhoneybeeswithoutarewardorpunishmentwasdone. A.tohelpimprovetheircalculatingskills B.toavoidsmells'influenceontheirchoices C.toshowtheimportanceofarewardtothem D.toincreasethechanceleveloftheircorrectanswers 2Whatcanbelearnedfromthelastparagraph? A.Honeybeescanonlyworkoutnumberstaughtbefore. B.Alotofmysteriesabouthoneybeeshavebeensolved. C.Thebrainsizeofhoneybeesdeterminestheircalculatingability. D.Thepowerofhoneybeesbrainsmaygobeyondourexpectations. 3Whatistheauthor'spurposeinwritingthetext? A.Topresenthoneybees'abilitytoperformbasicmath. B.Topersuadepeopletoexploremoreabouthoneybees. C.Todiscusshowhoneybeesrecognizeunfamiliarnumbers. D.Toexplainwhyhoneybeesaresmarterthanotheranimals.
假定你是李华你在某贴吧上看到美国孔子学院ConfuciusInstitute的学生Henry发帖希望通过网络视频互动学习中国诗词.请你给他写封邮件内容包括: 1.表示愿意帮助他; 2.说明你想帮助他的原因. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
“无细胞蛋白质合成系统”是利用细胞提取物人工添加所需原料和能源物质的体外蛋白质合成系统.下列叙述错误的是
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