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如图，已知C，D是反比例函数y＝图象在第一象限内的分支上的两点，直线CD分别交x轴、y轴于A，B两点，设C，D的坐标分别是（x1，y1）、（x2，y2），且x1＜x2，连接OC、OD． （1）若x...
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已知图中的曲线是反比例函数m为常数图象的一支.1这个反比例函数图象的另一支在第几象限?常数m的取值范
如图26111正比例函数y＝x的图象与反比例函数y＝k≠0在第一象限的图象交于A.点过A.点作x
已知图中的曲线是反比例函数y＝m为常数图象的一支.1这个反比例函数图象的另一支在第几象限常数m的取值
如图在平面直角坐标系中直线y=x﹣2与y轴相交于点A.与反比例函数在第一象限内的图象相交于点B.m2
如图6已知第一象限内的点
在反比例函数y =
的图象上，第二象限内的点
在反比例函数 y =
的图象上，且OA⊥0B ，cotA=
，则k的值为 A.-3 B.-6
-
-2
如图反比例函数图象在第一象限的分支上有一点C13过点C的直线y=kx+b〔k＜0〕与x轴交于点A.1
已知反比例函数图象的两个分支分别位于第一第三象限.1求k的取值范围2取一个你认为符合条件的K.值写出
如图在平面直角坐标系中直线y=x﹣2与y轴相交于点A.与反比例函数在第一象限内的图象相交于点B.m2
若反比例函数y＝的图象经过点2－1则该反比例函数的图象在
第一、二象限
第一、三象限
第二、三象限
第二、四象限
如图6已知第一象限内的点
在反比例函数y = 2x的图象上，第二象限内的点
在反比例函数 y = kx的图象上，且OA⊥0B ，cotA= 33，则k的值为 A.-3 B.-6
- 3
-23
已知反比例函数y＝a≠0的图象在每一象限内y的值随x值的增大而减小则一次函数y＝－ax＋a的图象不经
第一象限
第二象限
第三象限
第四象限
已知如图正比例函数y=ax的图象与反比例函数y=的图象交于点A321试确定上述正比例函数和反比例函数
如图在平面直角坐标系中直线y=x﹣2与y轴相交于点A.与反比例函数在第一象限内的图象相交于点B.m2
如图在平面直角坐标系中直线y=x﹣2与y轴相交于点A.与反比例函数在第一象限内的图象相交于点B.m2
已知一次函数y=kx+b的图象经过第一二四象限则反比例函数y=的图象在
第一、二象限
第三、四象限
第一、三象限
第二、四象限
已知反比例函数图象的两个分支分别位于第一第三象限.1求k的取值范围2取一个你认为符合条件的K.值写出
如图已知第一象限内的图象是反比例函数y=图象的一个分支第二象限内的图象是反比例函数y=-图象的一个分
已知反比例函数y＝a≠0的图象在每一象限内y的值随x值的增大而减小则一次函数y＝－ax＋a的图象不经
第一象限
第二象限
第三象限
第四象限
如图在平面直角坐标系中直线y=x﹣2与y轴相交于点A.与反比例函数在第一象限内的图象相交于点B.m2
已知反比例函数y=的图象经过点2﹣2则该反比例函数的图象位于
第一、二象限
第一、三象限
第二、三象限
第二、四象限
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Mother'sDaycandatebacktotheancientGreekswhoheldfestivities庆典inhonorofRheathemotherofthegods.AndtheearlyChristianscelebratedMother'sDayonthefourthSundayofLent大斋期inhonorofMarythemotherofChrist.HowevertheMother'sDaywascancelledbecauseoflackoftime.In1872JuliaWardHoweorganizedadayformotherswhowereworkinghardforthecauseofpeace.ItisgreatlandmarkinthehistoryofMother'sDay. In1907AnnaM.JarvisateacherfromPhiladelphiastartedamovementtosetupanationalMother'sDayinhonorofhermother.ThenacelebrationwasheldforAnna'smother.Annapresentedsomewhitecarnationshermother'sfavoriteflowerstohermotheronthatday.SevenyearslaterAnna'shardworkfinallypaidoffandin1914PresidentWoodrowWilsonannouncedthesecondSundayinMayasanationalholidayformothers. GraduallyMother'sDaybecameverypopularintheUS.ActuallythesecondSundayofMayhasbecomethemostpopulardayoftheyear.EventhoughAnnahasbeendeadforlongMother'sDaylivesonandhasspreadtolotsofcountriesallovertheworld.AlthoughmanycountriesaroundtheworldcelebrateMother'sDayatdifferentdatessomecountriesincludingDenmarkFinlandItalyTurkeyAustraliaandBelgiumstillcelebrateMother'sDayonthesecondSundayofMay. 35.WhodidancientGreeksholdfestivitiesinhonorof? A.MaryB.RheaC.AnnaD.Julia 36.WhydidAnnapresentsomewhitecarnationstohermother? A.Hermotherlikedwhitecarnationsverymuch. B.Shedidn'thaveenoughmoneytobuyotherthings. C.Sheherselflikedwhitecarnations. D.Itwasatraditioninherhometown. 37.Whatisthebesttitleforthepassage? A.Annaandhermother. B.Mother'sDayinancientGreece. C.ThehistoryofMother'sDay. D.People'sopinionsonMother'sDay.
Measuringupto10.5feetinlengththewesterngreenmamba曼巴蛇isthesecondlongestsnakeinAfricawiththeblackmambabeingthefirst.Itisalsothemostagile敏捷的snakeinthemambafamily.Theircolorischangeablewhichhelpsthemjointheirenvironment.Anotherdistinctivefeatureofthesnakeisitslongtailwithasharppoint. Thewesterngreenmambalivesinrainforests.Beinganarborealspeciesthesesnakesspendmostoftheirtimemovingamongthetreetops.Howevertheyusuallyleavetheirtreestopursueapotentialmealontheground.Thewesterngreenmambaismostlyactiveatdaybutcanalsobeseenhuntingatnight. Thedietofawesterngreenmambaconsistsofbirdsandavarietyofsmallmammalssuchassquirrelsmiceandevenbats.Thesesnakeswillapproachtheirtargetswiththehelpoftheirnaturalskincolor.Whentheyarecloseenoughtheywillbitetheirvictimsandinjectthemwithvenom毒液quickly.Oncethetargethasdiedtheweaterngreenmambawillswallowitsmealwhole.Iffacedwithdangerthesesnakeswilltrytorunaway.Iftheyarecorneredhowevertheywillbecomeextremelyaggressiveandstrikewiththeirsharpteethrepeatedly.Thefemaleweaterngreenmambaistheonewholayseggs.Shewilllayeggsanywhere.Theyoungsnakesarecompletelyindependent.Themotherandfatherplaynopartinraisingthebabysnakes.Thebabiesarebornwitheverythingtheyneedtosurviveinthewilderness.Theywillhavealmostnonaturalpredators捕食者toworryaboutwhentheyreachadulthood. 30.Whatdoestheunderlinedwordarborealinthesecondparagraphprobablymean? A.Mainlyfeedigonmeat. B.Mainlyfeedingonplants C.Livingontreesmostofthetime D.Livinginthegrassmostofthetime 31.Whenisthewesterngreenmambamostaggressive? A.whenithastoprotectitseggs B.Whenitissearchingforfood. C.Whenitapproachesitstarget D.Whenitgetsnowaytoescape 32.Whatcanwelearnfromthetext? A.ThewesterngreenmambacanbefoundalloverAfrica. B.ThewesterngreenmambaisthelongestsnakeinAfrica. C.Thewesterngreenmambaoftenswallowsliveanimalwhole. D.Thebabywesterngreenmambadoesn'tneedcare.
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为探究除草剂24﹣D对水稻田间鸭跖草防治的合适浓度进行相关实验实验结果如表所示除草剂的作用主要使植株平均株高下降下列对实验的有关叙述错误的是
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紫杉醇具有独特的抗肿瘤作用．研究人员从红豆杉中发现了一种具有产紫杉醇能力的内生真菌．为探究制备红豆杉内生真菌原生质体不含细胞壁的适宜pH和温度进行了如下实验①培养菌株离心收集菌丝体并用渗透压稳定剂洗涤两次②将获得的菌丝体分别置于不同pH或温度的培养液中并加入适量酶液震荡摇匀后每隔一段时间取样过滤离心用渗透压稳定剂洗涤两次后收集纯化的原生质体．③统计原生质体数量结果如下． 分析回答 1步骤②中加酶液的目的是洗涤时选用渗透压稳定剂的理由是． 2结果表明制备红豆杉内生真菌原生质体的适宜条件是． 3检验原生质体再生能力需要配制再生固体培养基培养基灭菌后需要冷却到℃左右才能用来倒平板． 4实验中将收集到的原生质体浓度为30×106个/mL培养液先稀释104倍再各取0.1mL稀释液分别均匀涂布在3个再生固体培养基上培养．一段时间后统计得到的菌落数分别为272124．则原生质体再生率能再生的原生质体数占全部原生质体的比例约为．
有一种XY型性别决定的虫媒花植物其花瓣性状由A﹣a和B﹣b两对独立遗传的基因控制其中B表达为红__为黄色Bb基因同时存在为红色有色花植株中雄性只有红色和黄色没有A基因仅有a基因时雌性植株没有花瓣而不能被昆虫辨识． 1B基因位染色体上在自然种群中控制花瓣性状的基因型共有种． 2某一橙红花植株与分别与红花植株实验一和黄花植株实验二杂交分别得F1． ①对该植株如何操作才能分别完成与红花植株实验一和黄花植株实验二杂交 ②在实验一的F1中雌性红花雌性橙花雌性无花瓣雄性红花雄性黄花＝33244则在自然条件下F2中橙花占． ③在实验二中其F1代没有无花瓣植株的产生则黄花植株实验二的基因型为． 3这种植物花色与昆虫之间的关系体现了生态系统的功能．
三孢布拉霉菌能用来生产胡萝卜素但该菌株的高产性状容易退化需要定期筛选出高产菌株研究表明菌体细胞内含有可将无色的TTC还原为红色复合物的物质且菌体细胞内该物质的含量越高还原能力越强胡萝卜素合成能力也越强．结合下列筛选菌株及提取胡萝卜素的流程图回答问题 三孢布拉霉菌→梯度稀释→涂布到含TTC的培养基上→挑取单菌落→扩大培养→收集菌丝并处理→萃取→鉴定 1胡萝卜素的提取方法有从植物中提取等等．上述流程图中提取到胡萝卜素后鉴定一般要用法．胡萝卜素能够治疗夜盲症干皮症等是因为夜盲症干皮症等疾病是由于缺少维生素A而引起的而1分子的β﹣胡萝卜素可被氧化分解成2分子．根据胡萝卜素的理化性质分析为了让胡萝卜素更容易被人体吸收炒胡萝卜时要多加些． 2流程图中将菌液涂布到含TTC的培养基上目的是筛选出合成胡萝卜素较强的菌体高产菌株含TTC的培养基属于填“选择”或“鉴别”培养基．对照组需涂布等量的以判断培养基是否被污染．挑取单菌落时若菌落周围则菌株合成胡萝卜素的能力较强． 3为了验证萃取物是否是胡萝卜素该同学将叶绿素b叶绿素a叶黄素萃取物和色素混合液含叶绿素b叶绿素a叶黄素和胡萝卜素依次点样在滤纸的12345位置如图甲所示并进行分离滤纸条上各色素带的位置为填字母时即可说明该萃取物最可能是胡萝卜素．
One'sattitudeisalwaysimportant.Ifyouarelazyandweakyouwillnevertastesuccess.Butifyouare1successandhappinesswillbemorelikelytocometoyou. Iloveeatingpersimmons柿子.Butyoucan'tgetthemuntilautumn.Ifyoutrythembeforetherighttimetheyprobably2bad.InGradeSixbecauseofmypoorgradesmyparentswere3thatIwouldn'tbeabletogetintoanexcellentmiddleschool.They4metostudyharderbutIdidn'treallyunderstandwhytheyweresoanxious焦虑的. SummercameandIstudiedhard.ThehotweathermademesleepyandIcouldn'tconcentrate集中精力onmytextbook.ButeverytimewhenIwantedtostop5mydadwouldsayThinkaboutyour6.Ifyoudon'tworkhardyouwillregret.Ihadtositbackdownagainandreturntomytextbooks.ButallI7wasplayingwithmyfriends. Mydadwouldsaytomewithaseriouslookon8faceIfapersimmontreedoesn'tgrowinsummeritcan'tbear结出fruitinautumn!Onlybyworkinghardcanyougetgoodresults.AfewmonthslaterIsucceededin9thekeymiddleschool.Iwassohappy.Mydadwasrightifapersimmontreedoesn'tgrow10summertherewillbenofruitinautumn.IworkedhardandIenjoyedthefruitofmyhardwork! 1.A.busy B.clever C.hard﹣working D.free 2.A.look B.taste C.turn D.smell 3.A.embarrassed B.worried C.excited D.annoyed 4.A.made B.allowed C.pushed D.pulled 5.A.thinking B.working C.playing D.looking 6.A.future B.hobby C.health D.wealth 7.A.talkedabout B.heardabout C.thoughtaboutD.throwabout 8.A.his B.your C.my D.their 9.A.failing B.reaching C.getting D.entering 10.A.before B.during C.after D.until
Thefirefighterscameintimeandquicklythefire.A.putup B.putout C.puton D.putoff
﹣﹣﹣WouldyoupleaseprovideussomeinformationabouttheearthquakeinQinghaiatthebeginningofthisyear?﹣﹣﹣Sure.It'ssaidthatitstartedtheafternoonofJanuary21st.A.for;on B.with;in C.with;on D.for;in
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