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设f（x）＝． （1）求证：f（x）在（0，1）和（1，+∞）上都是增函数； （2）若在函数f（x）的定义域内，不等式af（x）＞x恒成立，求a的取值范围．
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高三下学期数学《》真题及答案
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设函数fx在[01]上连续在01内可导且f1=0求证至少存在一点ξ∈01使得2ξ+1fξ+ξf’ξ=
设函数fx在[01]上连续在01内可导且f0f1＜0．求证存在ξ∈01使得ξf’ξ+4-ξ2fξ=0
设fx在[01]上连续在01内可导且f0=2f1=0．求证存在0＜η＜ζ＜1使得f’ηf’ζ=4．
设fx在[01]可导f0=0f’1=0求证存在ξ∈01使得f’ξ=fξ．
设fx在[01]上连续在01内可导f0=f1=0M=maxfx＞0m=minfx＜0．证明存在ξ∈0
设fx在[01]上连续且f0=f1=0．求证[*]
设fx在[01]上连续在01内二阶可导f0=f1=0对任意的x∈01fx＜0且fx在[01]上的最大
设函数fx在[01]二阶可导且f0=f’0=f’1=0f1=1．求证存在ξ∈01使|fξ|≥4．
设fx在[01]上连续在01内可导且f0=f1常数a＞0与b＞0．求证存在满足0＜ξ＜η＜1的ξ与η
设fx在[01]上连续在01内可导且f0=1f1=0．求证存在ξ∈01使[*]
设函数fx在区间-11内二次可导已知f0=0f'0=1且fx＜0当x∈-11时成立则
当x∈(-1，0)时f(x)＞x，而当x∈(0，1)时f(x)＜x．
当x∈(-1，0)时f(x)＜x，而当x∈(0，1)时f(x)＞x．
当x∈(-1，0)与x∈(0，1)时都有f(x)＞x．
当x∈(-1，0)与x∈(0，1)时都有f(x)＜x．
设函数fx在闭区间[01]上连续在开区间01内可导且f0=f1=1[*]．求证对任何满足0＜k＜1的
设fx在[01]上连续在01内可导且f0=f1常数a＞0与b＞0．求证存在满足0＜ξ＜η＜1的ξ与η
某同学准备用反证法证明如下一个问题函数fx在[01]上有意义且f0＝f1如果对于不同的x1x2∈[0
设函数fx在[01]上连续在01内可导且f0f1＜0．求证存在ζ∈01使得ζf’ζ+4-ζ2fζ=0
设fx在[01]上连续在01内二次可导且fx在[01]上的最大值M=2最小值m=0求证若fx的最大值
设函数fx在[01]上连续在01内可导且f1=0．求证至少存在一点ξ∈01使得2ξ+1fξ+ξf’ξ
设函数fx在区间-11内二次可导已知f0=0f'0=1且fx＜0当x∈-11时成立则
当x∈(-1，0)时f(x)＞x，而当x∈(0，1)时f(x)＜x
当x∈(-1，0)时f(x)＜x，而当x∈(0，1)时f(x)＞x
当x∈(-1，0)与x∈(0，1)时都有f(x)＞x
当x∈(-1，0)与x∈(0，1)时都有f(x)＜x
设fx在[01]上连续且f0=f1=0．求证[*]．
设函数fx在[01]上连续在01内可导且f0=00＜f’x＜10＜x＜1．求证[*]
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用日记形式记一次有意义的旅行. 提示1.时间2014年10月16日星期天2.天气晴3.人员你班全体人员4.地点贺兰山森林公园乘车一小时到达5.活动内容记录看到的动植物野餐检验河水看看是否有污染. 注意词数100左右.
如图表示在水分充足晴朗无风的夏日一天中不同时段内某植物净光合速率与胞间CO2浓度的变化曲线．据图回答下列问题 1CO2进入叶肉细胞后首先与C5结合这个过程叫做生成的C3被还原需要的条件是． 2植物的净光合速率可用单位时间量表示． 3900〜1100时段与1300〜1400时段叶片的光合速率都在上升导致光合速率上升的主要原因分别是． 41700后叶片的胞间CO2浓度快速上升主要原因是．
Thinkoflifeasagameinwhichyouareplayingwithfiveballsintheair.Younamethemworkfamilyhealthfriendsandspirit精神andyoukeepallofthemintheair.Youwillsoonunderstandthatworkisrubberball.Ifyoudropititwillbounce弹回back. Buttheotherfourballsfamilyhealthfriendsandspiritaremadeofglass.Ifyoudroponeofthesetheywillbebroken.Theywillneverbethesame.Youmustunderstandthatandtrytohavebalanceinyourlife.How? Don'tlookdownonyourvaluebycomparingyourselfwithothers.Itisbecausewearedifferentandeachofusisspecial. Don'tletotherpeoplesetgoalsforyou.Onlyyouknowwhatisbestforyourself. Don'tgiveupwhenyoustillhavesomethingtogive.Nothingisreallyoveruntilthemomentyoustoptrying. Don'tbeafraidofdifficulties.Itisbytakingchancesthatwelearnhowtobebrave. Don'tshutloveofoutofyourlifebysayingit'spossible.Thequickestwaytoreceiveloveistogiveitthefastestwaytoloseloveistoholdittootightthebestwaytokeeploveistogiveitwings. Don'trunthroughlifesofastthatyouforgetnotonlywhereyou'vebeenbutalsowhereyouaregoing. Don'tbeafraidtolearn.Knowledgeisatreasure珍宝youcanalwayscarryeasily. Don'tusetimeorwordscarelessly.Youcan'tgetthemback.Yesterdayishistorytomorrowismysteryandtodayisagiftthat'swhywecallitthepresent.Lifeisnotacompetitionbutatripstepbystep. 61.Thepassagetellsusnottobecauseeveryoneisspecial. A.beafraidofdifficulties B.beafraidtolearn C.runthroughlifesofast D.compareyourselfwithothers 62.ThesentenceNothingisreallyoveruntilthemomentyoustoptrying.Meansthat. A.Nothingispossible. B.ifwedon'tgiveupthereisalwayshope C.youshouldlearntogiveup D.althoughyoutrynothingwillchange 63.Whycan'tweusetimecarelessly? A.Becausetimeistooexpensive. B.Becausetimeneverreturns. C.Becausewearetoopoor. D.Becausetimewillgetback. 64.Ifyourunthroughlifesofastyouwill. A.loseyourowntreasurethatyoucanalwayscarryeasily B.loselovebyholdingittootight. C.forgetnotonlywhereyou'vebeenbutalsowhereyouaregoing D.notbeafraidofthedifficulties 65.Accordingtothepassagewhichisthebesttitle? A.Nothingisimpossible B.Glassballsareeasytobebroken C.Thingsyoucan'tdo D.Treatyourlifeinarightway.
theInternetcanbehelpfulIdon'tthinkitwisetospendtoomuchtimeonit. A.Though B.Because C.As D.If
有关蛋白质结构与功能的叙述错误的是
﹣﹣﹣Thedoorisopen.SomeonehavecomeinwhileIwasout. ﹣﹣﹣Really?Youcallthepoliceimmediately. A.mightmust B.canneed C.mustmust D.mustcan
糖耐量受损IGT的人表现为空腹血糖浓度正常负荷如饮食后血糖浓度升高异常．为了探究运动对IGT的干预情况受试者于餐后进行中等强度持续运动30min定时采样测定血糖浓度及胰岛素含量实验结果如图所示．由此分析推测错误的是
Itwasdarkcoldandwet.OnmywayhomeIcouldhearsomeone36.Thecryingwascomingfroma37boyofabout12yearsold.Hewasjustwearingaworn﹣outshirtto38himselffromthenight'scold.39enoughhewasholdingahundred﹣dollarbill.ThinkingthathehadbecomelostfromhisparentsIaskedhimwhatwas40. Hetoldmehissad41.Hesaidthathehadthreebrothersandfoursisters.Hisfatherdiedwhenhewasnineyearsold.His42waspoorlyeducatedandworkedtwopart﹣timejobs.Shemadeverylittleto43herlargefamilyhowevershehadmanagedtogive44hundreddollarstobuyherchildrensomeChristmaspresents. Theyoungboyhadbeen45byhismotheronthe46tohersecondjob.Hewastousethemoneytobuypresentsforallhisbrothersandsisters.Hehadnoteven47themallwhenanolderboyrobbedhimofoneofthetwohundred﹣dollarbillsanddisappearedintothe48Whydidn'tyoushoutforhelp?Iasked. Ididrepliedtheboy. But49cametohelpyou? Theboy50shookhisheadNoone51thatIwascrying.IwassofrightenedthatI52. ThatnightI53manyhoursbuyingpresentsforhimandhisfamilyandIalsohelpedhim54home.IjustwantedtotellhimBebravehelpwillalwayscome.Hiseyeswerefilledwithtearsandhegavemeawarmhug﹣themostexpensivegiftIhadever55.Iknewhewantedtotellmehewill. 36.A.sighing B.smiling C.crying D.whispering 37.A.poor B.bad C.kind D.careless 38.A.protect B.prevent C.separate D.benefit 39.A.Interestingly B.Personally C.Strangely D.Seriously 40.A.true B.lost C.broken D.wrong 41.A.news B.story C.result D.history 42.A.mother B.sister C.brother D.aunt 43.A.help B.treat C.support D.offer 44.A.several B.two C.one D.many 45.A.pickup B.droppedoff C.takenon D.putoff 46.A.trip B.way C.direction D.road 47.A.cleaned B.opened C.entered D.checked 48.A.dark B.room C.eye D.day 49.A.somebody B.anybody C.everybody D.nobody 50.A.sadly B.happily C.nervously D.friendly 51.A.forgot B.cared C.told D.thought 52.A.gaveoff B.gaveaway C.gaveup D.gaveout 53.A.cost B.took C.lost D.spent 54.A.back B.out C.up D.across 55.A.adopted B.received C.chosen D.accepted
2018年3月14日物理学家霍金去世他曾经患有肌肉萎缩性侧索硬化症即“渐冻症”有研究表明该病是由于突变的基因导致运动神经元合成了某种毒蛋白从而阻碍了轴突内营养物质的流动．也有最新研究结果表明利用诱导多功能干细胞IPS细胞制作前驱细胞然后移植给渐冻症实验鼠能延长其寿命．下列相关描述错误的是
toyourfriendandIamsurethatyou'llbebackplayingtogether. A.Talking B.Talked C.Talk D.Totalk
围绕“一带一路”建设位于我国西南一隅的中科院成都生物研究所构建出了一条“绿色”的“一带一路”．如图为该研究所与坦桑尼亚坦噶地方政府共建的世界上第一座大型剑麻废液沼气工程流程图请据图分析回答下列问题 1在自然生态系统中储存在剑麻体内的能量最终去向是．在人工种植的剑麻中其能量来源填“大于”“小于”或“等于”剑麻固定的全部太阳能． 2该项目有很大的发展前途可以利用剑麻废液进行沼气发电解决了废液出路问题实现了废弃资源的． 3剑麻生态系统的维持填“不需要”或“需要”人类的干预与草原生态系统相比该生态系统的抵抗力稳定性填“较强”“较弱”“相同”． 4从保护环境的角度分析该项目实施的意义是．
Longtimeagotherewasaseed种子andbecausehewasonlyaseednobodynoticedhim.Thusfeelinginferior低等的theseedgavenoimportancetohisexistence. Thenonedayawindpickedhimupandthrewhimonanopenfieldunderthesun.Laterhewasgivenrain. Yearslaterhesawatravelersittingbyhisside.ThankGodforthis.Ireallyneedsomerestheheardthetravelersay. Whatareyoutalkingabout?theseedquicklyasked.Hethoughtthemanwasmakingfunofhim.Nooneeverspoketohimlikethat. Whojustspoke?theshockedmanasked.Itisme.Aseed. Aseed?Themanlookedatthebigtree.Areyoujoking?Youarenotaseed.Youareabigtree! Really? Yes!Whyelsedoyouthinkpeoplecomehere? Whatdotheycomeherefor? Tofeelyourshade树阴!Don'ttellmeyoudidn'tknowyouhadgrownovertime. Amomentpassedbeforethetraveler'swordsbroughthimpride. Theseedthoughtandsmiledforthefirsttimeinhislife.Theyearsoftorture折磨bythesunandtherainfinallyhelpedhimgrowup. Oh!ThatmeansI'mnotalittleseedanymore!Iwasactuallyborntomakepeoplefeelcomfortable.Wow!That'sgreat! 21.Theseeddidn'trealizetheimportanceofhisexistencebecause. A.nobodylookedafterhim B.hewasthrownintotheopenair C.hewassuchasmallseed D.hedidn'tbelieveinhimself 22.Thetravelersatbytheseed'ssideto. A.escapefromtherain B.thankGodforofferinghimatree C.havearestandenjoytheshade D.talkwiththebigtree 23.Howdidtheseedfeelafterhearingthetraveler'swordsatlast? A.Sad. B.Proud. C.Funny. D.Sorry. 24.Wheredoesthepassagemostprobablycomefrom? A.Ahistorybook. B.Asciencebook. C.Astorybook. D.Anovel.
WhenIlivedinSpainsomeSpanishfriendsofminedecidedtovisitEnglandbycar.Beforetheylefttheyaskedmeforadviceabouthowtofindaccommodation住所.Isuggestedthattheyshouldstayat‘bedandbreakfast'housesbecausethiskindofaccommodationgivesaforeignvisitoragoodchancetospeakEnglishwiththefamily.Myfriendslistenedtomyadvicebuttheycamebackwithsomefunnystories. Wedidn'tstayatbedandbreakfasthousestheysaidbecausewefoundthatmostfamilieswereawayonholiday. Ithoughtthiswasstrange.FinallyIunderstoodwhathadhappened.MyfriendsspokelittleEnglishandtheythought‘VACANCIES'meant‘holidays'becausetheSpanishwordfor‘holidaysis‘vacancies'.Sotheydidnotgotohousewherethesignoutsidesaid‘VACANCLES'whichinEnglishmeanstherearefreerooms.Thenmyfriendswenttohousewherethesignsaid‘NOVACANCLES'becausetheythoughtthismeantthepeoplewhoownedthehousewerenotawayonholiday.Buttheyfoundthatthesehouseswereallfull.Asaresulttheystayedathotels! Welaughedaboutthisandaboutmistakesmyfriendsmadeinreadingothersigns.InSpanishtheword‘DIVERSION'meansfun.InEnglishitmeansthatworkmenarerepairingtheroadandthatyoumusttakeadifferentroad.Whenmyfriendssawtheword‘DIVERSION'onaroadsigntheythoughttheyweregoingtohavefun.Insteadtheroadendedinalargehold. Englishpeoplehaveproblemstoowhentheylearnforeignlanguages.OnceinParis.WhensomeoneofferedmesomemorecoffeeIsaid‘Thankyou'inFrench.ImeantthatIwouldlikesomemoreHowevertomysurprisethecoffeepotwastakenaway!LaterIfoundoutthat‘Thankyou'inFrenchmeans‘Nothankyou.' 5.MySpanishfriendswantedadviceabout. A.learningEnglish B.findingplacestostayinEngland C.drivingtheircaronEnglishroads D.goingtoEnglandbycar 6.Isuggestedthattheystayatbedandbreakfasthousesbecause. A.theywouldbeabletopracticetheirEnglish B.itwouldbemuchcheaperthanstayinginhotels C.itwouldbeconvenientforthemtohavedinner D.therewouldbenoproblemaboutfindingaccommodationthere 7.NOVACANCIESinEnglishmeans. A.nofreerooms B.freerooms C.notawayonholiday D.holidays 8.WhensomeoneofferedmemorecoffeeandIsaid‘Thankyou'inFrenchI. Adidn'treallywantanymorecoffee B.wantedthemtotakethecoffeepotaway C.reallywantedsomemorecoffee D.wantedtoexpressmypoliteness.
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