已知三棱锥A-BCD中,AB⊥面BCD,BC⊥CD,AB=BC=CD=2,则三棱锥A-BCD的外接球体积为 。
已知函数,
.
(Ⅰ)函数与
的图象无公共点,试求实数
的取值范围;
(Ⅱ)是否存在实数,使得对任意的
,都有函数
的图象在
的图象的下方?若存在,请求出最大整数
的值;若不存在,请说理由.
(参考数据:,,
,
).
________ the past, leaving the sadness behind, _____ you’ll see the door of a new bright world open before you.
A. Forget; and B. Forgetting; and C. Forget; / D. To forget; /
美国历史学家费正清在《观察中国》一书中写道:“他们每天都亲眼目睹少年们在‘阶级斗争’的借口下,对长辈进行抢劫、报复、打骂和侮辱;他们必须出席公开批判邻居、朋友、同事和父母的大会,甚至还要积极发言……”费正清笔下的历史事件
A.严重践踏了中国的民主和法制 B.促进了中国思想文化的发展
C.发生在20世纪50年代 D.体现了启蒙思想的自由平等
In the English Reading Week, one of my classmates recommended a quote to us,
61 goes like this; "Your future depends on many things, 62 mostly on you. " I can't agree 63 (much) with this view. It's true that our future 64 (determine) by many things, such as opportunities and help from others, but our own attitude, determination, 65 hard work play a more important role. In 66 words, we are the master of our own future.Take Abraham Lincoln for example. He was born in a poor family, and only received a 67 (limit) education in his childhood. Yet through his painstaking efforts, he changed not only his own fate but also the history of America. 68 to this day. Lincoln 69 (regard) as one of the most inspiring figures in the world. 70 , I firmly believe that our future is in our own hands.
已知函数f(x)=x3-3ax2。
(1)讨论f(x)的单调性;
(2)若f(x)在区间[0,2]上有最小值-32,求a的值。
乳糖酶能催化乳糖水解.有两项与此相关的实验,其实验条件均设置为最适条件.实验结果如下:以下分析正确的是()
实验一 酶浓度 0% 1% 2% 4% 5%
(乳糖浓度为10%) 相对反应速率 0 25 50 100 200
实验二 乳糖浓度 0% 5% 10% 20% 30%
(酶浓度为2%) 相对反应速率 0 25 50 65 65
A. 实验一如果继续增加酶浓度,相对反应速率不再加大
B. 实验一增加乳糖浓度,相对反应速率将降低
C. 实验二若继续增大乳糖浓度,相对反应速率不再加大
D. 实验二若提高反应温度条件5℃,相对反应速率将增大
蚕豆是二倍体植物,正常体细胞有12条染色体。蚕豆根尖细胞的细胞周期约为17.3h。让萌发的蚕豆种子在低温(4℃)条件下培养36h后,一个处在分裂期的根尖细胞中的染色体数最多时为
A.48条 B.36条 C.24条 D.12条
1919年,北京学生发表宣言,“山东亡,是中国亡矣。我同胞处此大地,有此山河,岂能目睹此强暴之欺凌我,压迫我,牛马我,而不作万死一生之呼救乎。”下列对此理解正确的是( )
①反映了五四运动爆发的直接原因 ②体现了中华民族意识的苏醒
③说明爱国主义是五四运动的主旋律 ④表明中国无产阶级已经登上历史舞台
A.①②③④ B.①②④ C.①③④ D.①②③
对于公益活动,马云曾经如是说:“无论我们做不做公益,世界都会发生变化。但你做了,改变的是你自己。”你对此的理解是
①开展公益活动是加强精神文明建设的中心环节②要在实践活动中改造主观世界
③弘扬传统美德需要提高科学文化修养④践行社会主义核心价值观要从我做起
A.①②B.①③C.②④D.③④
下图是以极点为中心的半球图,箭头表示洋流的流向。读图完成6~8题。
6、图中①②③④洋流与其形成的盛行风搭配正确的是()
A.①——东北信风B.②——盛行西风C.③——西南季风D.④——极地东风
7、图中P、Q、M、K四海域洋流对地理环境的影响是()
A.Q地因受寒流影响,冬季气温较低 B.P地因受暖流影响,冬季气温较高
C.M海域多海雾,对海上航运不利 D.K海域因上升流而形成大渔场
8、若图中弧线EOF为晨昏线,则此时()
A.EO为昏线 B.FO为晨线
C.北京昼短夜长 D.伦敦日影朝正北
有机物A的相对分子质量小于150,其中含氧的质量分数为23.5%,完全燃烧只生成二氧化碳和水。有机物之间的相互转化如图(部分反应条件略)。
请回答下列问题:
(1)H和F中含有的官能团的名称分别为:H中______________;F中________________。
(2)有机物E的结构简式为_______________________________。
(3)有机物G能发生的反应类型有____________________(填字母)。
A.取代反应 B.加成反应 C.消去反应 D.加聚反应 E.氧化反应
(4)以M表示有机物的摩尔质量,则下列关系正确的是______________(填字母)。
A.M(A) = M(B) + M(C) B.M(D) = M(G) + 14
C.2M(F) + 18 = M(D) + M(G) D.M(D) > M(F) > M(G) > M(H)
(5)简述检验有机物F中的官能团的实验方法_______________________________________
___________________________________________________________________________________________________________________________________________________________。
(6)写出反应①的化学方程式:_______________________________________________;
写出能验证苯酚和碳酸酸性 强弱的化学反应方程式: _____________________________。
如图所示,把系在轻绳上的A、B两球由图示位置同时由静止释放(绳开始时拉直),则在两球向左下摆动时,下列说法正确的是
A.绳OA对A球做正功
B. 绳AB对B球不做功
C.绳AB对A球做负功
D.绳AB对B球做正功
The Dragon Boat Festival has been marked by eating zong zi and racing dragon boats for thousands of years. It 61. ________(fall) on the fifth day of the fifth month according to the Chinese lunar calendar in honor of Qu Yuan, 62. _______ is said to have committed suicide by drowning himself.
Qu was a minister of the State of Chu 63.________(situate) in the present-day Hunan and Hubei provinces during the Warring States Period.He was upright, loyal and 64. _______(high) respected. 65.__________, he was fired from office due to his suggestion to fight against Qin in cooperation with other states. During his stay in other states, he wrote many poems to express his strong love for his country. When Chu 66. ________ (defeat) by Qin, he realized 67.________ he could do about it is nothing. Qu jumped into Miluo River on the fifth day of the fifth month.
After the 68. _________ (dead) of Qu Yuan, people of Chu went to Miluo River to mourn over the great 69. ________ (poem) they loved so much. People threw eggs and rice wrapped in leaves into the river to feed the fish to keep them away from Qu Yuan. Now the Dragon Boat Festival has become 70.________ traditional festival for the Chinese people.
Speaking is not equal to learning
1. You don't need to study grammar too much.
The first suggestion may sound strange to many students who begin to learn English, but
it is exactly important. 36 However, if you want to speak fluently, you should try to
speak English without thinking too much of grammar. Studying grammar will only slow you
down and make you hesitate. You will think about the grammar rules instead of naturally
saying a sentence like a native.
2. You can't translate every word.
When you try to speak English, you do not need to translate every word from your
mother tongue. 37 Another problem you may meet is that you will misuse grammar rules
that you have learned in your mother language.
3. 38
The reason why many people can learn well is that they often practise. But in order to
speak English fluently, you need to practise speaking. When you study, don't just listen.
Speak out loud the material you are listening to and practise what you hear. Practise speaking
out loud until your mouth and brain can do it without any effort. 39
4. You should study correct material.
A phrase you often hear is, "Practice makes perfect." This is not completely true.
Practice only makes what you are practising permanent. If you practise the incorrect sentence,
you will have perfected saying the sentence incorrectly.40
A. You should try to speak fluently.
B. You need to practise speaking what you hear.
C. By doing so, you will be able to speak English fluently.
D. If you want to pass examinations, you should study grammar well.
E. If you listen more, you can speak correctly and fluently sooner or later.
F. Therefore, it is important that you study material that is commonly used by mostpeople.
G. The order of words is probably completely different and you may be both slow and incorrect by doing this.
(一)文言文阅读(19分)
阅读下面的文字,完成10——13题。
崔恭,字克让,广宗人。正统元年进士,除户部主事,提举京畿学事。出理延绥仓储,有能声。以杨溥荐,擢莱州知府。内地输辽东布,悉贮郡库,岁久朽敝,守者多破家。恭别构屋三十楹贮之,请约计岁输外,余以充本府军饷,遂放遣守者八百人。也先犯京师,意欲厚索礼币,恭遣朔方民兵数千入援。廷议城临清,檄发役夫,恭以方春民乏食,请俟秋成。居府六年,莱人以比汉杨震。
景泰中,超迁湖广右布政使。诸司供给,率取之民。恭与僚佐约,悉罢之。公安、监利流民擅相杀。恭下令愿附籍者听,否则迨秋遣归,众遂定。寻迁江西左布政使。司有广济库,官吏干没五十万。恭白于巡抚韩雍,典守者咸获罪。定均徭法,酌轻重,十年一役,遂为定例。
天顺二年,宁王奠培不法,恭劾之。削其护卫,王稍戢。迁右副都御史,代李秉巡抚苏、松诸府。按部,进耆老言利病,为兴革。与都督徐恭浚仪真漕河,又浚常、镇河,避江险。已,大治吴淞江。起昆山夏界口,至上海白鹤江,又自白鹤江至嘉定卞家渡,迄庄家泾,凡浚万四千二百余丈。又浚曹家港、蒲汇塘、新泾诸水。民赖其利,为立生祠。初,周忱奏定耗羡则例,李秉改定以赋之轻重递盈缩。其例甚平,而难于稽算,吏不胜烦扰。恭乃罢去,悉如忱旧。
吏部缺右侍郎,李贤、王翱举恭,遂召用。置“劝惩簿”,有闻皆识之。翱甚倚恭,转左侍郎。父忧起复。宪宗即位,乞致仕。不允。成化五年,尚书李秉罢。商辂欲用姚夔,彭时欲用王概,而北人居言路者,谓时实逐秉,喧谤于朝。时称疾不出,侍读尹直以时、概皆己乡人,恐因此得罪,急言于辂,以恭代秉。越五月,母丧归,比其去,王翱以诗赠之。服除,起南京吏部,劾罢诸司不识者数人。十一年春,命参赞机务。居三年,致仕。又二年卒。赠太子少保,谥庄敏。
(选自《明史•崔恭传》,有删改)
【注】①戢:收敛,停止。②耗羡:赋税的加耗部分抵朴实耗后的所余。
10.对下列句中画波浪线的词语的解释,不正确的一项是 ( )
A.意欲厚索纳礼币 币:钱币
B.率取之民 率:全都
C.进耆老言利病 耆:年老
D.母丧归,比其去 比:等到
11.下列对文中相关内容的解说,不正确的一项是 ( )
A.“京畿”,古代国都及其附近的地区。在唐朝的时候,将京城的旁邑作为畿县,统称京畿。
B.“朔”,北(方),如朔漠,指北方的沙漠。此外“朔”也用来指时间,即农历每月的最后一天。
C.“生祠” 指为还活着的人修建祠堂,往往为了纪念某人功绩或逢迎某人,修建的让人祭拜的地方。
D.“谥”又叫“谥号”,是古代帝王、大官或文人隐士等死后的称号,是对死者带有评判性的称号。
12.下列对原文有关内容的概括和分析,不正确的一项是 ( )
A.崔恭为官一任,治政有方。崔恭在担任莱州知府时,很多看守布匹仓库的人因为布腐烂而破产,崔恭另外修建了房屋来贮存布匹,解决问题。
B.崔恭秉公执法,不徇私情。公安、监利的流民随意相互杀人,崔恭下令愿意入到当地户籍的人就可以入,否则到秋天就遣回原籍,那些人就安定下来了。
C.崔恭以民为本,治理河道。在代替李秉巡查苏州、松江等府时,他和徐恭疏通仪真等处河道,随后,大力治理吴淞江,共疏通河道一万四千多丈。
D.崔恭政声显著,深得信任。吏部右侍郎的位置空缺,李贤和王翱共同举荐崔恭,崔恭被召用;他作了有名的“劝惩簿”,之后转任吏部左侍郎。
13.把文中画横线的句子翻译成现代汉语。(10分)
(1)廷议城临清,檄发役夫,恭以方春民乏食,请俟秋成。
(2) 侍读尹直以时、概皆己乡人,恐因此得罪,急言于辂,以恭代秉。
铁及其化合物在日常生活中应用广泛。
(1)取5.6 g的生铁与足量的稀硫酸混合反应,无论怎样进行实验,最终收集的气体体积均小于2.24 L(标准状况),最主要的原因是____________________________;所得溶液在长时间放置过程中会慢慢出现浅黄色,试用离子方程式解释这一变化的原因:________________________________。
(2)氧化铁是重要的工业颜料,下面是制备氧化铁的一种方法(铁屑表面常附着油污),其流程如下:
①操作Ⅰ的名称是________;操作Ⅱ为洗涤,洗涤操作的具体方法为__________________。
②滤液A中加入稍过量的NH4HCO3溶液,生成沉淀的同时有一种气体(能使澄清石灰水变浑浊)产生,写出其化学方程式: __________________________________。
(3)如果煅烧不充分,产品中将有FeO存在,称取3.0 g氧化铁产品,加酸溶解,在250 mL容量瓶中定容;量取25.00 mL待测溶液于锥形瓶中,用酸化的0.010 00 mol·L-1 KMnO4溶液滴定至终点,重复滴定2~3次,消耗酸性KMnO4溶液体积的平均值为20.00 mL。
①该实验中的KMnO4溶液需要酸化,用于酸化的酸是________(填序号)。
a.硝酸 b.盐酸 c.硫酸
②上述产品中Fe2O3的质量分数为________。
下面是以小麦为实验材料所进行的实验,其中叙述正确的是( )
A.将发芽的种子研磨液置于试管内,加入斐林试剂,试管内立即呈现砖红色沉淀,这是因为发芽的小麦种子中含有还原性糖
B.利用小麦叶片进行“观察DNA和RNA在细胞中的分布”的实验时,叶片需要用酒精进行脱色处理,实验结果是绿色主要分布在细胞质,红色主要分布在细胞核
C.用显微镜观察小麦根尖成熟区表皮细胞,可观察到有丝分裂的图像,从而判断出每个细胞中的染色体数目
D.若利用小麦根毛细胞进行质壁分离实验,由于观察的细胞无色透明,为了取得更好的观察效果,调节显微镜的措施是缩小光圈或换平面反光镜
WHAT’ SON
STAGE Russian dances: The famous“Little White Birth”Dance Troupe will travel from Russia to Present performances in Beijing. The troupe, founded in 1948, is famous for their combination of Russian folk dances and classical dancing art. It has been invited by the Beijing Foreign Culture Exchange Co to give four performances in Beijing. Tickets are available(可得到的)through ticket hotlines and website such as www, paio. com.cn, www.chinaticket. com and www.ticket. elong. com Time: 7:30 pm, January 18—21 Place: Beizhan Theatre, 135, Xiwai Dajie, Xicheng District Tel: 6606—4258 EXHIBITIONSKite show: All together 81 kites collected by the China National Art Museum is on show in the Yanhuang Art Museum. Kong Xiangze, an expert on Chinese kites, published a book on kites, explaining the origins of the Kite—making process. The exhibited kites are made in a traditional Chinese style. Time: 9 am—5 pm until February 11 Place: 9 Huizhong Lu Tel: 6491—2902 | CONCERTSFolk music: A concert of classics of Chinese folk music will greet audiences on the first day of the Year of Snake at the Beijing Concert Hall. The China Song and Dance Ensemble will perform dozens of traditional instrumental pieces, such as“Full of Joy,”“Colourful Cloud Chasing the Moon,”and “Spring Festival Suite.” Time: 7:30 pm, January 24 Place: 1, Beixinhuajie, Xicheng District Tel: 6559—8285 EVENTSFlower festival:The Beijing Botanical Garden is bringing people a blooming festival with the beautiful flowers in its tropical(热带)plants greenhouse. The garden has introduced nearly 80 kinds of flowers from abroad for the exhibition. There is also an exhibition of potted narcissus(水仙)landscapes(风景).More than 300 mini landscapes involving imported narcissus will be displayed. People can get a preview of the show by visiting www. beijingbd. com, the garden’s website. Time: 8:30 am -5pm until January 28 Place: Wofosi Lu near the Fragant Hills Tel: 8259—5547 |
1.Suppose you are too far away from Beijing or you can’t spare time to go there in person, which of the following show can you enjoy all the same?
A.Russian dances B.Kite show
C.Folk music D.Flower festival
2.The phrase“get a preview of”used in the passage means .
A.watch in advance B.see clearly
C.get good position of D.get a general idea of
3.If you and your classmates have a free evening to spend on the 19th of January, which is a useful number to call?
A.6606—4258 B.6491—2902 C.6559—8285 D.8259—5547