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回答下列与种群数量有关的问题． （1）将某种单细胞菌接种到装有10mL液体培养基（培养基M）的试管中，培养并定时取样进行计数．计数后发现，试管中该种菌的总数达到a时，种群数量不再增加．由此可知，该...
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高三下学期生物《》真题及答案
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回答下列问题某种昆虫在不同温度和湿度条件下种群数量的变化如上图在温度偏离最适温度或湿度偏离最适湿度条
下图表示某种群数量变化可能的四种情况Ｊ型ⅠⅡⅢ其中a点表示外界因素的变化请据图回答问题若该种群为东亚
右图为不同培养阶段酵母菌种群数量葡萄糖浓度和乙醇浓度的变化曲线请回答下列问题曲线AB段酵母菌细胞呼吸
右图所示为某种群在不同条件下的增长曲线请据图中回答下列问题若在理想的环境中种群内个体数量增长曲线是在
右图是探究影响酵母菌种群数量变化因素时获得的实验结果有关分析正确的是
0点时酵母菌的接种量会影响发酵速率
M点前酵母菌不进行细胞呼吸
N点时酵母菌种群增长速率最大
P点以后酵母菌数量下降只与酒精浓度有关
下图是探究影响酵母菌种群数量变化因素时获得的实验结果有关分析错误的是
0点时酵母菌的接种量会影响酵母菌的发酵速率
M点前酵母菌不进行细胞呼吸
N点时酵母菌种群增长速率最大
P点以后酵母菌数量下降只与酒精浓度有关
为探究培养液中酵母菌种群数量的动态变化兴趣小组按下表完成了有关实验并定期对培养液中的酵母菌进行计数绘
下图a为建立的人工生态系统示意图b为放养在其中的某种鱼的种群数量增长率随时间的变化曲线回答下列问题
为探究培养液中酵母菌种群数量的动态变化兴趣小组按下表完成了有关实验并定期对培养液中的酵母菌进行计数绘
回答有关种群的问题1组成种群的个体在其生活空间中的位置状态或布局如下图所示三种分布方式是对种群___
右图所示为某种群在不同条件下的增长曲线请据图中回答下列问题如果在自然环境中种群内个体数量的增长曲线是
如图为某种群在不同生态系统中的增长曲线请仔细分析图中曲线后回答问题1如果种群处于一个理想的环境中没有
回答下列与种群数量有关的问题．1将某种单细胞菌接种到装有10mL液体培养基培养基M的试管中培养并定时
下列与种群数量相关的描述正确的是
一段时间内某种群出生率升高，则在此期间该种群的数量一定上升
若某种群的年龄组成为增长型，则该种群数量一定增加
利用性引诱剂诱杀某种害虫的雄性个体，是从直接改变种群的年龄组成入手减少害虫的数量
我国一线城市人口的剧烈波动往往与迁入率、迁出率有关
下图所示为某种群在不同条件下的增长曲线请据图中回答下列问题每空2分共16分如果在自然环境中种群内个体
右图是探究影响酵母菌种群数量变化因素时获得的实验结果有关分析正确的是
M.点前酵母菌不进行细胞呼吸
0点时酵母菌的接种量会影响酵母菌的发酵速率
N.点时酵母菌种群增长率最大
P.点以后酵母菌数量下降只是因为空间有限
请完善下列探究实验并回答相关问题实验材料酵母菌洁净的试管滴管__灭菌过的5%葡萄糖溶液显微镜血球计数
回答下列问题某种昆虫在不同温度和湿度条件下种群数量的变化如上图所示据图回答在温度偏离最适温度或湿度偏
右图所示为某种群在不同条件下的增长曲线请据图中回答下列问题种群最基本的数量特征是其调查动物常用法
酵母菌是一种单细胞真菌常用于生物实验请回答下列问题1右图是酵母菌细胞结构模式图酵母菌代谢中产生CO2
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如图是2018年第一季度五省GDP情况图则下列描述中不正确的是
已知椭圆a＞b＞0的离心率为右焦点为F以原点O为圆心椭圆C的短半轴长为半径的圆与直线相切． 1求椭圆C的方程 2如图过定点P20的直线l交椭圆C于AB两点连接AF并延长交C于M求证∠PFM＝∠PFB．
25℃时NaCN溶液中CN﹣HCN浓度所占分数δ随pH变化的关系如图甲所示．向10mL0.01mol•L﹣1NaCN溶液中逐滴加入0.01mol•L﹣1的盐酸其pH变化曲线如下图乙所示[其中a点的坐标为9.50.5]．下列溶液中的关系中一定正确的是
由X在酸性条件下制备Y一种合成香料医药农药及染料的中间体的流程如图下列说法正确的是
已知数列{an}满足n∈N*则a25﹣a1＝．
复数z1＝3+2ii为虚数单位是方程z2﹣6z+b＝0b∈R的根则b＝
如图在直三棱柱ABC﹣A1B1C1中底面△ABC为等腰直角三角形AB＝BC＝2AA1＝3P为B1C1的中点Q为BB1的三等分点靠近B1点． Ⅰ求三棱锥P﹣AQC的体积 Ⅱ在线段A1C1上找点M使得B1M∥平面APQ写出作图步骤但不要求证明．
在直角坐标系xOy中曲线C1的参数方程为α为参数．P是曲线C1上的动点将线段OP绕O点顺时针旋转90°得到线段OQ设点Q的轨迹为曲线C2．以坐标原点O为极点x轴正半轴为极轴建立极坐标系． Ⅰ求曲线C1C2的极坐标方程 Ⅱ在Ⅰ的条件下若射线与曲线C1C2分别交于AB两点除极点外且有定点M40求△MAB面积．
已知△ABC点M是边BC的中点若点O满足则
双曲线a＞0b＞0A﹣t0Bt0t＞0斜率为的直线A点且与双曲线交于MN两点．若则双曲线的离心率为
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AftershoppingfordealsinstoresonBlackFridayoronlineonCyberMondayAmericansandpeopleworldwidearepreparingfornewlypopularGivingTuesday.Startingin2012nowtheglobaleventthatiscelebratedannuallyontheTuesdayafterThanksgivingisthebrainchildof92ndStreetYaculturalcenterinNewYorkCityandtheUnitedNationsFoundation. AsthenameindicatesGivingTuesdayismeanttorestartthecharitableseasonandthereforeobservedbyraisingfundsforlocalnonprofitsandschoolsorganizingfoodandclothingdrivesandconductingrandomactsofkindness.In2015700000peoplefrom71countriescametogethertodonate116.7millionincash.Anadditional1.08millionwasspentongifts. Whiletheeasiestwaytoparticipateisbydonatingtoyourfavoritecharitythisdaycanbecelebratedinmanyotherwaystoo.Youcangivebackbyvolunteeringatyourlocalshelterorfoodbankorevenbydonatingblood.Ifallelsefailsapurchasefromthegrowingnumberoforganizationsthatgiveaportionoftheirsalestocharitywilldothetrick. Butperhapsthebestwaytocelebratethedayisthosenearestanddearesttoyou.Assistafamilymemberwithasimplechorelikefoldinglaundrycookingdinnerorevenreadingtoayoungersibling.NomatterwhatyoudobesuretoshareyourgooddeedonsocialmediaandinspireotherstocelebrateGivingTuesdayaswell! 1Whichofthefollowinghastheshortesthistory? A.GivingTuesday. B.BlackFriday. C.ThanksgivingDay. D.CyberMonday. 2What'sthemainpurposeofGivingTuesday? A.TomakeThanksgivingDayenjoyable. B.Toencouragemorepeopletodocharities. C.Togetvoluntaryworkbetterknown. D.Topersuademorepeopletoshoponline. 3Whydoestheauthoradvisesharinggooddeedsonsocial? A.Tokeeparecordofone'sexperience. B.Tohelppeoplemakenewfriends. C.TomakeGivingTuesdaymorepopular. D.Todonatemoneytolocalschools. 4Whichsectionofawebsitedoesthetextprobablycome. A.Lifestyle. B.Education. C.Culture. D.Business.
已知集合A＝{x|﹣2＜x≤2}B＝{x|≤﹣1}则A∩B＝
如图先画一个正方形ABCD再将这个正方形各边的中点相连得到第2个正方形依此类推得到第4个正方形EFGH．在正方形ABCD内随机取一点则此点取自正方EFGH内的概率是
如图已知正方体ABCD﹣A1B1C1D1的棱长为4P是AA1的中点点M在侧面AA1B1B内若D1M⊥CP则△BCM面积的最小值为
假设你是红星中学高三学生李华.英国交换生Jim在给你的邮件中提到他对中国传统文化很感兴趣计划下学期参加相关社团他向你征询建议.请给他回邮件推荐你校的京剧社团.邮件内容包括 1.介绍京剧社团活动等 2.推荐的理由 3.建议他做准备简要了解京剧 4.词数100左右. 参考词汇京剧PekingOpera社闭community DearJim
YoursonhassufferedbraindamagethedoctortoldmymotherafterIwasbominthehospital.HewillneverwalkorspeakandI1youfindasuitableinstitutioninwhichtoplacehim/'Mom'sresponsewasastubborndeterminationtoprovehim2. Thenextyearshouldhavebeenoneoffirstsbutminecame3thanaverage.PhotosshowIamahealthychild.Whatyoucan't4aremom'seagerhandssupportingmefrombehind5Icouldn'tsitup.Althoughmyathletic6werelackingmycognitive认知的abilitiesconvincedherIwas7Mombegantoexercisemyarmsandlegs.8wasslowbutshecontinuedtrying.Severaltripstohospitalsdidn't9doctorsofanyprogress.Howeverallthenon﹣stopexercisepaidoff.At2Icouldsitupandmovearoundonmybehind10Istillcouldn'tcrawllikeababy.Apieceofequipmentwas11thestandingbox.Lockedintoanupright直立positionIscreamedfor12Momhadtoexplaintotheneighbors1wasn'tbeing13.AftereachtreatmentintheboxshewouldholdmeclosetellingmeIwouldsomeday14. Forsixmonthsusingtheequipmentwaspainfulbutit15.OnedayasIwascopyingthe16ofcartooncharactersIjumpedupandstartedrunningaroundtheroom.LaughingandjumpingaroundIcalledouttoMom.She17silentlyfromthekitchendoorwaynoddingwithtearsinhereyes.18.herlittlePatrickhaddefeatedtheexperts. ThenIwenttopreschoolhighschoolandcollegeand19aneditorofafamousmagazine. ThanksMom.The20youchosehasmadeallthedifference. 1A.promise B.order C.suggest D.beg 2A.honest B.wrong C.guilty D.silly 3A.slower B.higher C.heavier D.smaller 4A.miss B.control C.have D.see 5A.though B.if C.because D.until 6A.theories B.skills C.materials D.fuels 7A.important B.perfect C.normal D.patient 8A.Progress B.Result C.Process D.Time 9A.warn B.remind C.inform D.convince 10A.or B.yet C.so D.for 11A.stolen B.broken C.repaired D.added 12A.joy B.freedom C.food D.sleep 13A.abused B.accepted C.teased D.refused 14A.speak B.hear C.walk D.drive 15A.worked B.changed C.burnt D.stopped 16A.names B.voices C.faces D.actions 17A.watched B.listened C.read D.wrote 18A.Suddenly B.Quietly C.Strangely D.Finally 19A.visited B.became C.praised D.helped 20A.gift B.style C.road D.education
已知O为△ABC内一点且若BOD三点共线则t的值为
由含碘废水制取碘酸钾的一种工艺如图 1写出KIO3在日常生活中的一个重要应用． 2检验“含碘废水”中是否含有单质I2的常用试剂是写试剂名称． 3通入SO2的目的是将I2还原为I﹣该反应的离子方程式为． 4工艺中五种物质的制备反应中不涉及氧化还原反应的步骤是“制”． 5“制KIaq”时该温度下水的离子积为Kw＝1.0×10﹣13Ksp[FeOH2]＝9.0×10﹣15．为避免0.9mol•L﹣1FeI2溶液中Fe2+水解生成胶状物吸附I﹣起始加入K2CO3必须保持溶液的pH不大于． 6“制KIO3溶液”反应的离子方程式为． 7KClKIO3的溶解度曲线如图所示．流程中由“KIO3aq”得到KIO3晶体的操作步骤为．
若[x]表示不超过x的最大整数则图中的程序框图运行之后输出的结果为
Happinessistheonlytruemeasureofpersonalsuccess.Makingotherpeoplehappyisthehighestexpressionofsuccess.1Withthatinmindherearesomesuggestionsthatwillimmediatelyincreasetheamountofhappinessinyourlife 2 Ifthere'sanybigtruthaboutlifeit'sthatitusuallylivesuptoyourexpectations.ThereforewhenyourisefrombedmakeyourfirstthoughtSomethingwonderfulisgoingtohappentoday.Guesswhat?You'reprobablyright. Taketimetoplanandprioritize优先处理 Themostcommonsourceofstressisthethoughtthatyou'vegottoomuchworktodo.Ratherthanworryaboutitpickonethingthatwillmoveyouclosertoyourhighestgoalandpurposeinlife.Thendothatfirst. Eathighqualityfoodslowly 3Evensoatleastonceadaytrytoeatsomethingreallydeliciouslikeasmallchunkoffinecheeseoranimportedchocolate.Tasteitfocusonitandenjoyit. Letgoofyourresults Thebigenemyofhappinessisworrywhichcomesfromfocusingoneventsthatareoutsideyourcontrol.Onceyou'vetakenactionthere'susuallynothingmoreyoucando.4 Endeachdaywithgratitude Justbeforeyougotobedwritedownatleastonewonderfulthingthathappened.Itmightbesomethingassmallasmakingachildlaughorsomethingashugeasamilliondollardeal.5. A.Starteachdaywithexpectations. B.Giveagifttoeveryoneyoumeet. C.Focusonthejobathandratherthansomefantasythatmighthappen. D.Whateveritisbegratefulforthatdaybecauseitwillnevercomeagain. E.Sometimeswecan'tavoideatingsomethingquicklyandrunning. F.Thinkingaboutthatthingmakesyourheadhurt. G.It'simpossibletomakeothershappyifyou'renothappy.
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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.每处错误仅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Λ.并在其下面写岀修改后的词. 删除把多余的词用斜线\划掉. 修改在错的词下面画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2只允许修改10处多者从第11处起不计分 InmylifeIhavemetmanypeoplewhoreallyworthrecalling.ButperhapsthemostunforgettablepersonismyChineseteacher.Hegaveusthebestgifttheteachercanofferapassionforlearning.HenotonlytaughtmetoappreciatethebeautyofChineseliteraturebutalsoarouseourinterestinexploringsomethingdeeper.BesideIwasattractedbyhislivelyteachstyle.Wewerealwayslongingforhisclasswithgreateagerbecausehislectureswerehumorouslydelivered.FinallyIwasdeeplyimpressedbytherespectheshowedforusforhetreateduslikefriendratherthanstudents.SinceitisnearlytenyearssinceIattendedtohislastclassIknowpartofhimhasalreadystayedinmyheart.
“建设天蓝地绿水清的美丽中国”是每个中国人的愿望．下列做法与此相符的是
FuXueweia25﹣year﹣oldgirlfromChengduChina1recentsharedabeautifulsetofweddingphotosontheInternet.Howeverthere'sadebateonthephotographs2nogroom新郎seemstobefoundinthephotos.InfacttheonlypeoplefeaturedinthephotosareMs.Fuandher87﹣year﹣oldgrandfather. DespitehavingnoplansofgettingmarriedanytimesoonFudecided3weartheweddingdressforhergrandfather.ThemanfellseriouslyilllastSeptemberwithdoctorswarningthathecouldpassaway4anytime.5fearhemightnevergettofulfillthedreamofwalkingherdowntotheMr.RightFuarrangedthesurprisephotoshoot.Keepingherplansasecretshetook6shegrandfatherforaregularhospitalcheck﹣uponlytorevealthattheyweregoingtotakepictureslaterandheagreed. Ms.Fu7raisebyhergrandparentsfromtheageoften8makesthemmeanalottoher.Sheinsistsontakingcareoftheminreturn.Theyoungwomaneven9haveatattoo纹身ofhergrandfather.Ihadmygrandfather'sappearancetattooedonmyarmbecauseIwantallmynew10friendtoknowwhathelookslikeinthefutureshesaid.
若变量xy满足约束条件则z＝lny﹣lnx的最大值为
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已知函数若fa＝7a∈R则f﹣a＝．
NotriptoChicagoiscompletewithoutavisittotheArtInstitutewhichisthesecondlargestartmuseuminthenation. Openinghours Mon﹣Wed&Fri﹣Sun1030am﹣5pmThu1030am﹣8pmclosedonNewYear'sDayThanksgivingandChristmasDay. Highlights •TheModemWingcontainscontemporarymasterpiecesbyDaliMatisseMiroPicassoPollockandWarhol. •IntheCentralHallvisitorscanviewoneoftheworld'sfinestImpressionistcollectionsincludingmasterpiecesbyMonetDegasRenoirSeuratGauguinandVanGogh. •ThorneMiniatureRoomsofferadetailedviewofEuropeanhomesfromthe16thcenturythroughthe1930sandAmericanhomesfromthe17thcenturyto1940. •Thepastreturnsasover550worksfrom4000yearsofartcometogetherinOfGodsandGlamourlocatedinthebeautifulnewMaryandMichaelJaharisGalleriesofGreekRomanandByzantineArt. Adviceforvisitors •Freeguidedtoursareavailabledailyatnoon. •Freeart﹣makingactivitiesareavailableforchildreneachweekendfrom11amto2pm. •VisittheFamilyRoomintheRyanEducationCenteropendailyfrom1030am﹣5pmandintroduceyourchildtotheniuseuni'scollectionswithavarietyofhands﹣onactivities.Assemble组装puzzlesbasedonmasterpiecesyou'llseeinthegalleriesbuildarchitecturalwonderswithcolorfulblocksandlearnaboutartthroughstoriesandgamesatCuriousComer. •CheckouttheLion'sTrialtourforchildrenages5﹣10.Thistourisespeciallydesignedfortheyoungpeopleinyourgroup!Don'tmissit! Gettingthere Youcantakethefollowbuses13467142628126143. 1WhenisitsuitableforyoutovisittheArtInstitute? A.At330pmonThanksgivingDay. B.At830amonSaturday. C.At7pmonThursday. D.At10amonTuesday. 2WhoseworkscanvisitorsseeintheModemWing? A.Picasso. B.VanGogh. C.Monet. D.Seurat. 3WherecanyougoifyouwanttoseeEuropeanhomesinthe17th? A.TheFamilyRoom. B.ThorneMiniatureRooms. C.OfGodsandGlamour. D.TheModemWing. 4WhatcanchildrendoatCuriousComer? A.Holdabirthdayparty. B.JointheLion'sTrailtour. C.Communicatewithartists. D.Playwithcolorfulblocks.
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