当前位置:文档之家› 2021年高二上学期周练生物试题 Word版含答案

2021年高二上学期周练生物试题 Word版含答案

2021年高二上学期周练生物试题 Word版含答案
2021年高二上学期周练生物试题 Word版含答案

2021年高二上学期周练生物试题 Word版含答案

一、单项选择题(25×3)

1、下列关于兴奋在神经纤维上传导的叙述,正确的是

A.静息状态时膜两侧电位为外负内正

B.兴奋部位的膜两侧电位为外正内负

C.兴奋在神经纤维上以化学信号形式传导

D.兴奋部位与未兴奋部位之间形成局部电流

2.反射弧是反射的结构基础,下图为人体反射弧结构示意图,其中表示神经中枢的是

A.①B.③C.④D.⑤

3.下图表示人体甲状腺激素分泌调节示意图,有关叙述错误的是

A.激素甲为促

甲状腺激素B.激素乙为甲状腺激素

C.激素乙的分泌受激素甲的影响D激素乙增加一定促进激素甲的分泌

4.人体组织细胞需要通过内环境与外界环境进行物质交换,下列不属于内环境的是

A.细胞内液B.组织液C.淋巴D.血浆

5.H7N9禽流感病毒已经导致多人患病,我国正在加紧研发相应疫苗,接种疫苗可有效提高机体免疫力,下列相关叙述错误的是

A.接种疫苗后机体会产生相应抗体B.抗体的化学本质是蛋白质

C.抗体能直接清除宿主细胞内的抗原D.抗体由浆细胞产生

6.不科学的生活方式使得有“富贵病”之称的糖尿病患者日益增多。当糖尿病病情严重时,通常需要注射的药物是

A.生长激素B.甲状腺激素C.胰高血糖素D.胰岛素

7.1928年,荷兰科学家温特利用燕麦胚芽鞘进行了下图所示的有关实验,一段时间后,放

置琼脂块的胚芽鞘生长情况是

A.不生长B.直立生长

C.向右弯曲生长D.向左弯曲生长

8.下图为不同浓度生长素类似物对小麦胚芽鞘生长影响的曲线图,有关叙述正确的是A.a点对应浓度的生长素类似物抑制胚芽鞘生长

B.b点对应的浓度为生长素类似物促进胚芽鞘生长的最适浓度

C.c点对应浓度的生长素类似物抑制胚芽鞘生长

D.d点对应浓度的生长素类似物促进胚芽鞘生长

9.研究种群的特征有助于有害生物的防治和濒危物种的保护,下列不属于种群特征的是A.种群密度B.年龄组成C.物种丰富度D.出生率和死亡率

10.由于生活习性的不同,青、草、鲢、鳙四大家鱼分布在池塘的不同水层中,这一现象体现了群落的

A.水平结构B.垂直结构C.初生演替D.次生演替

11.下图是几种生物的食物关系图,相关叙述正确的是

A.草属于生产者

B.食草昆虫属于第一营养级

C.该食物网中有3条食物链

D.猫头鹰只占一个营养级

12.下列能构成种群的是()

A.池塘中的鲫鱼和水库里的鲫鱼B.一个湖泊中各种鱼类的总和

C.同一块草地中所有的环毛蚓D.一片森林中各种生物个体的总和

13.下面实例中,不能构成生物群落实例的是()

A.亚马孙河谷的热带雨林B.无菌培养基上污染后长出的共生菌落

C.大兴安岭的红松林D.无菌培养基上接种后长出的大肠杆菌菌落

14.体液不包括下列哪项

A.细胞内液B.血浆C.淋巴D.唾液

15.在接种了相应的疫苗后细胞外液中会出现抗体,抗体是由下列哪种细胞分泌的A.T细胞B.B细胞C.效应B细胞D.效应T细胞

16.下图为高等动物的体内细胞与外界环境的物质交换示意图,其中①②③表示系统,④⑤表示物质,⑥表示组织细胞与外界环境的关系,下列叙述正确的是()

A.①③都必须通过消化系统才能完成

B.人体的体液包括内环境和细胞外液

C.细胞与内环境交换的④为养料和氧气

D.⑥可表述为:体内细胞可与外界环境直接进行物质交换

17.如图为研究生长素(IAA)产生部位及运输方向的实验,初始时,琼脂块①~⑥不含IAA,对实验结果表述正确的是()

A.①②琼脂块中都有IAA,①>②

B.③④琼脂块中都有IAA,③≈④

C.⑤⑥琼脂块中都有IAA,⑤≈⑥

D.③④琼脂块中含有的IAA,与⑤⑥相等

18.下列描述属于种群的是

A.一个池塘的所有鱼B.一片森林的所有鸟

C.一片草地的所有蒲公英D.一片森林的所有真菌

19.一个种群最基本的数量特征是

A.种群密度B.出生率和死亡率C.年龄结构D.性别比例

20.一个生态系统的结构说全了是指

A.生物成分和非生物成分B.食物链和食物网

C.组成成分和营养结构D.生产者、消费者和分解者

21.甲、乙为某种生物种群的年龄结构曲线,如不考虑其他因素,种群甲和种群乙未来个体数量的发展趋势是()

甲乙

A.衰退型和增长型B.增长型和衰退型

C.稳定型和衰退型D.稳定型和增长型

22.在下列图中,表示种群在无环境阻力状况下增长的是()

23.假如要调查一块农田中某种鼠和某种双子叶草本植物的种群密度,你将分别采用什么方法()

A.样方法、样方法

B.标记重捕法、标记重捕法

C.样方法、标记重捕法

D.标记重捕法、样方法

24.在一个阴湿山洼的草丛中,有一堆长满苔藓的腐木,其中聚集着蚂蚁、蚯蚓、蜘蛛、老鼠等动物,这些生物共同构成了一个()

A.生物群落B.种群C.生态系统D.生物群体

25.早在宋代,我国就产生了四大家鱼混养技术。下图表示某池塘中四大家鱼及其食物的

分布,相关分析正确的是()

A.四大家鱼在池塘中的分布具有垂直分层现象

B.此图表明四种鱼类在能量流动上的关系为:鲢鱼→鳙鱼→青鱼

C.鲢鱼和鳙鱼、青鱼和草鱼在混合放养时都是共生关系

D.若浮游动物大量死亡,鲢鱼数量将以J型曲线持续增长

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25

二、非选择题

26、研究发现飞蝗种群数量的消长受多种因素的影响(如图甲、乙所示)。当雨量充沛、气候潮湿时,真菌、丝虫和蛙等大量繁殖可抑制飞蝗的种群数量;蝗虫的产卵量受到相对湿度的影响,飞蝗的发生量与降雨量有密切关系。请依据以上信息回答下列问题:

(1)真菌与飞蝗的关系是________,蛙与飞蝗的关系是________。

A.共生B.寄生C.捕食D.腐生

(2)当雨量充沛、空气相对湿度在70%左右时,飞蝗产卵量比空气干燥时________。

(3)在干旱的气候下,飞蝗发生量变化趋势是。

27、根据碳循环示意图(如图所示)回答:

(1)在该生态系统各成分中A为________,B为________,碳元素在大气中与A、B、C 之间的流动是以____________的形式进行的。

(2)碳元素从大气流向C是通过________作用实现的,从C流向A是通过同化作用实现的。

(3)生物群落中的一部分碳返回大气中,而另一部分碳则以化石燃料的形式贮藏于地层中。碳在无机环境中以__________和__________的形式存在,碳在生物群落中是以__________形式存在的。

(4)从碳循环过程可以知道生态系统的物质循环特点是:①____________;

②______________。

的发生量变大

27、(1)消费者分解者二氧化碳(2)光合(3)二氧化碳碳酸盐有机碳(4)①全球性②反复循环出现

39634 9AD2 髒36231 8D87 趇34722 87A2 螢;23113 5A49 婉7U29534 735E 獞i34807 87F7 蟷20604 507C 偼23729 5CB1 岱

2019-2020学年度第一学期高二英语周练试卷(含答案)

2019-2020学年度第一学期高二英语周练试卷 第二部分:阅读理解(共两节,满分40分) 第一节(共15小题;每小题2分,满分30分) 阅读下列短文,从每题所给的四个选项中,选出最佳选项。 A Well, parents, surprise! Lots of us are using Twitter and Facebook to find rides, and not just to school. It’s awkward to call a friend and ask for a ride, and half the time they’ll say, “Sorry, my car is full.” But with Twitter, you just tweet #Ashleys Pool Party and look for other people heading the same way. It may sound risky, but many teens stay within their own social circles to find rides, and don’t branch out beyond friends when asking on Twitter. For me, I only rideshare with people I know, but to some young people, especially those taking longer trips, stranger danger is less of a concern. The sharing economy got big during the recession(经济衰退). It allows people to access more goods and services using technology, while also allowing them to share cost. And that technology, for me, is what the car was for my mom, a gateway to more freedom. According to the researchers at the University of Michigan, 30 years ago, eight in ten American 18-year-olds had a driver’s license. Today it’s six in ten. So it’s not that surprising that on my 16th birthday I wasn’t rushing to get a license. All I wanted was an iPhone. Juliet Schor (Sociology professor at Boston College) knows people of my age love being connected and for young people driving means they have to disconnect from their technology, and that’s a negative. So if they could sit in the passenger side and still be connected, that’s going to be a plus. To me, another plus is ridesharing represents something more than trying to save money. I see it as evidence that people still depend on each other. My generation shares their cars and apartments the way neighbors used to share cups of sugar. For the system to work, some of us still need our own cars. But until I get my own version of the silver Super Beetle, you can find me on Twitter. 21 The writer usually rideshares with _____. A. anyone heading the same way B. people he knows

高二英语周练

高二英语周练 第一节完形填空(共20小题;每小题1.5分,满分30分) 阅读下面短文,掌握其大意。然后从各题所给的四个选项中,选出最佳选项Nowadays many people enjoy 1 activities—walking, cycling or mountaineering. People often 2 the act of climbing high and difficult mountains to be astonishing. Why are men and women 3 to suffer cold and hardship, and to 4 on high mountains? This astonishment may be caused by the difference between mountaineering and other forms of activities to which men 5 their leisure time. There are no man-made rules, as there are for 6 sports as golf and football. There are, of course, principles of different kinds. It would be dangerous if you 7 them. But it is this freedom from man-made rules 8 makes mountaineering attractive to many people. Those who climb mountains are free to choose their own 9 . If we 10 mountaineering with other more familiar sports, we might think that one big difference is that mountaineering is not a kind of 11 work at all. 12 , it is only our misunderstanding. There are n o “matches” 13 “teams” of climbers, but when climbers are on a rock face linked by a rope which their lives may 14 , there is obviously teamwork. A mountain climber knows that he may have to fight with natural 15 that are stronger and more powerful than man. A mountain climber 16 to improve his skill year after year. A skier has probably passed his best by the age of thirty, and most tennis champions 17 in their early twenties. But it is not 18 for men of fifty or sixty to climb the highest mountains in the Alps. They may take more 19 to do that than younger men, but they probably climb more skillfully and with less effort, and they certainly experience equal 20 . 1. A. physical B. easy C. difficult D. mental 2. A. find B. respect C. treat D. consider 3. A. scared B. willing C. afraid D. suitable 4. A. have a break B. make sense C. take a risk D. lose weight 5. A. give B. hope C. discover D. receive 6. A. so B. various C. different D. such 7. A. applied B. worried C. ignored D. noticed 8. A. which B. that C. how D. why 9. A. methods B. tradition C. styles D. activities 10. A. contact B. relate C. replace D. compare 11. A. pair B. complex C. team D. simple 12. A. Otherwise B. Therefore C. Furthermore D. However 13. A. between B. within C. from D. beyond 14. A. keep on B. go on C. depend on D. focus on 15. A. storms B. forces C. energies D. strengths 16. A. tries B. wants C. continues D. decides 17. A. will be B. are C. appear D. is 18. A. unusual B. normal C. common D. frequent 19. A. gifts B. means C. brains D. time 20. A. astonishment B. ambition C. concern D. enjoyment 第二部分阅读理解阅读下面短文,从每题所给的A, B, C, D四个选项中,选出最佳选项。(共20小题, 每小题2分, 满分40分) A

5—16学年高二生物周练试题(2015 (39)

兴国三中高二生物周周练(十一) 一、选择题(每题2分,共50分) 1、在农业生产中,用一定浓度的植物生长素类似物作为除草剂,可以除去单子叶农作物田间的双子叶杂草。如图表示生长素浓度对两类植物生长的影响,则A、B曲线分别表示何类植物,以及适应选用生长素类似物的浓度是 A、双子叶植物、单子叶植物;c点浓度 B、单子叶植物、双子叶植物;a点浓度 C、双子叶植物、单子叶植物;b点浓度 D、单子叶植物、双子叶植物;b点浓度 2、有关“探索生长素类似物促进插条生根的最适浓度”实验的叙述,错误的是 A、在预实验中不需要设置用蒸馏水处理的对照组 B、在正式实验中,不同浓度生长素类似物处理组之间形成相互对照 C、处理时应该用生长素类似物溶液浸泡和沾蘸插条的基部 D、用于扦插的枝条应带有一定数量的幼芽以利于更好的生根 3、如图是研究植物向性运动的实验示意图,实验结果不能说明的是 A、根具有向重力性,茎具有负向重力性 B、生长素对植物的作用具有两重性 C、根和茎的向性运动都是一种适应 D、产生生长素的部位是根尖和茎尖 4、假设图中含生长素(IAA)的琼脂块和胚芽鞘尖端所产生的生长素量相同,则一段时间后对a、b、c、d四个空白琼脂块中所含生长素量的分析正确 的是 A、c>a=b>d B、a=c>b=d C、 c>a>b>d D、a>c>d>b 5、下列关于植物激素的叙述,正确的是 A、赤霉素促进种子休眠 B、脱落酸能延缓叶片的衰老 C、生长素促进果实成熟 D、植物的生长发育受多种激素共同调节 6、下列有关植物激素及植物生长调节剂应用的叙述,不正确的是 A、用适宜浓度乙烯利处理凤梨,可加快果实成熟 B、用适宜浓度赤霉素处理生长期的芦苇,可提高产量 C、用适宜浓度细胞分裂素处理大麦,可抑制细胞分裂 D、用适宜浓度2,4-D处理插条,可促进插条生根 7、下列有关植物生长调节剂应用的叙述,错误的是

生物周练试题27

生物试题 一、选择题(每题1分共36分) 1.下列关于细胞结构和功能的叙述,错误的是 A.生物膜相互转化的基础是膜的组成和结构的相似性 B.内质网与细胞新陈代谢有密切的关联,因此细胞代谢越旺盛,细胞的内质网就越多 C.细菌和酵母菌都有细胞膜、核糖体、DNA、RNA D.细胞核即贮存遗传信息,也能对细胞的新陈代谢有调控作用 2.现有一种含催产素的新药,它能使人们对陌生人产生信赖感。这一新药可能有助于治疗孤独症等疾病。 催产素是由下丘脑合成、垂体后叶释放的一种九肽激素。下列有关叙述正确的是 A.催产素一定含有C、H、O、N四种元素,含有9个肽键 B.孤独症患者直接口服适量催产素可以有效地缓解症状 C.下丘脑中有些细胞不仅能够分泌激素,而且能传导兴奋 D.催产素参与的调节过程具有作用范围比较局限、作用时间比较长等特点 3、将植物细胞放入一定浓度的KNO3溶液中,先质壁分离后又自动复原,与此过程有关的细胞器是 A.液泡 B.线粒体,液泡 C.高尔基体,线粒体 D.内质网,液泡 4.下列四组细胞器中,在其生命活动中均可产生水的一组是 A.核糖体、液泡、高尔基体B.线粒体、中心体、高尔基体 C.内质网、核糖体、线粒体D.叶绿体、线粒体、核糖体 5.下列有关酶的叙述中,正确的是 A.都是在模板的指导下经过核糖体的合成、内质网加工和高尔基体进一步加工等几个阶段形成的 B.DNA解旋酶可使DNA的氢键断裂,DNA连接酶则可使DNA片段的黏性末端通过氢键连接起来 C.在pH约为8.0时,用胰蛋白酶液处理剪碎的动物组织最容易获得单细胞悬浮液 D.向任何酶溶液中加入双缩脲试剂,溶液都将呈现紫色 6.下列有关几种化合物的叙述正确的是 A.转运RNA、抗体、酶、载体蛋白发挥相应作用后,不能继续发挥作用的是抗体 B.叶绿体中的色素分布在类囊体的膜上,参与光反应的全过程 C.人体血浆中的缓冲物质就能使人体血液的PH值保持相对恒定 D.垂体细胞膜上的某受体蛋白可同时识别促甲状腺激素释放激素和甲状腺激素 7.图甲是H2O2酶活性受pH影响的曲线,图乙表示在最适温 度下,pH=b时H2O2分解产生的O2量随时间的变化。若该酶 促反应过程中改变某一初始条件,以下叙述正确的是 A.pH=c时,e点为0 B. H2O2量增加时,e点 不移,d点左移 C.温度降低时,e点不移,d点右移 D.pH=a时,e点下移,d点左移 8.光合作用过程中,水的分解及三碳化合物形成糖类所需要的能量分别来自。 A.细胞呼吸产生的ATP和光能 B.都是细胞呼吸产生的ATP C.光能和光反应产生的ATP、NADPH D.都是光反应产生的ATP

高中英语周练 (单选+句子翻译+单句改错)50题

高中英语周练50题 (单选+句子翻译+单句改错) 1、That he hasn’t come is _____ he is busy writing the papers. A.that. B.why. C.because. D.the reason 2、One of the man held the point______ .(be) 这些人当中的一个支持那个观点-------书上说的是对的。 3、______________ many times ,he eventually did that (warn) 尽管被警告过多次,但他还是做了。 4、________________ ,he felt very afraid. (ask) 当被问到他父母时,他感到很害怕。 5、With ______________ ,some animals are facing the danger of dying out. (cut) 由于越来越多的森林被砍伐,一些动物正面临着灭绝的危险。 6、翻译: ①他一整天都在忙。(busy) ______________________ ②到1990年底,科学家们一直都在研究它。(develop) ___________________________________ ③这两天我给你打过几次电话。(ring)

_______________________ ④他试着着用酒精擦拭那污迹。(try) _________________________________ 7、If it were not for the fact ____________ ,she would attend tonight's voice of China. (fall) 要不是她生病了,她今晚就会参加中国好声音。 8、Tom wont come tonight, __________________ we will not hold the party.(case) 汤姆今晚不来了,这样的话,我们就不举办宴会了。9、It's usually warm in my hometown ,but it _____ be rather cold sometimes. A.must. B.can. C.should. D.would 10、------Where is my dictionary ?I remember I put it here yesterday. -------You _____ put it in the wrong place. A.could have. B.might have. C.might. D.should have 11、_____ ,I have to stay home. A.I was ill. B.Being ill. C.Because of ill. D.Because of I was ill 12、_____ a traffic jam, it is to lose patience. A.Being caught in. B.Caught in. C.Catching in.

2021年高二下学期英语周练试卷(尖子班重点班5.25) 含答案

丰城中学xx学年下学期高二英语周练试卷 2021年高二下学期英语周练试卷(尖子班重点班5.25)含答案 一、完形填空(共20小题,每小题2分,满分40分) Before my year abroad, everyone advised me to say “yes” to everything. They weren’t 1 . However, here in Germany, “I don’t mind” doesn’t seem to be an acceptable 2 . Neither does “I’ll do whatever you want to do” nor “Really, either way is fine by me”. It really is 3 yes or no. Despite having a huge smile on your face, most Germans will look at you 4 you’re unable to make a 5 , which of course isn’t true; we’re just bei ng really typically British. My first encounter (遭遇) of this was when I 6 the hotel for my first two nights in Germany. The 7 asked when I would like my breakfast in the morning. Being typically British, I replied saying whenever was 8 for her. She gave me a(n) 9 look and asked again. “No, when do you want to have 10 ? Er, OK ... err .... 8 am?” she smiled and I 11 quickly, “Only if that is12 for you though.” I knew about the British stereotype (模式化的形象) of 13 before I came abroad. However, I didn’t 14 how much truth there was to it until

2021年高二学业水平测试周练6生物含答案

高二生物练习 xx.03.02 一、单项选择题:本部分包括35题,每题2分,共70分。每题只有一个选项符合题意 1、下列有机化合物中,只含有C、H、O三种元素的是 A.氨基酸B.核苷酸C.脱氧核糖D.磷脂[来 2、属于植物细胞发生质壁分离的内因是 A.外界溶液浓度大于细胞液浓度 B.外界溶液浓度小于细胞液浓度 C.原生质层的伸缩性较大,细胞壁的伸缩性较小 D.原生质层的伸缩性较小,细胞壁的伸缩性较大 3、能使植物细胞壁和细胞膜结构均破坏的一组酶是 A.淀粉酶、纤维素酶、溶菌酶 B.纤维素酶、果胶酶、蛋白酶 C.果胶酶、溶菌酶、纤维素酶 D.磷脂酶、淀粉酶、蛋白酶 4、《齐民要术》中,要求栽种农作物要“正其行,通其风”,原理是 A.确保通风透光,从而有利于提高光合作用的效率 B.通风透光,可以增强农作物的呼吸作用 C.可以增强农作物的抗性 D.增强农作物的蒸腾作用 5、有关真核细胞分裂的叙述,正确的是 A.植物细胞有丝分裂末期细胞膜凹陷分开细胞 B.动物细胞仅以有丝分裂方式进行增殖 C.无丝分裂过程核膜不消失 D.无丝分裂仅出现于低等生物 6、细胞的有丝分裂和减数分裂都可能产生可遗传的变异,其中仅发生在减数分裂过程的变异 是 A.染色体不分离或不能移向两极,导致染色体数目变异 B.非同源染色体自由组合,导致基因重组 C.染色体复制时受诱变因素影响,导致基因突变 D.非同源染色体某片段移接,导致染色体结构变异 7、癌症是严重威胁人类健康的疾病之一,下列有关描述正确的是 A.亚硝酸盐可通过改变基因的结构而致癌 B.癌症是致癌因子引发的,患病几率与年龄无关 C.长期接触癌症患者的人细胞癌变几率增加 D.艾滋病患者与正常人患癌症的几率相同 8、右图是一个哺乳动物细胞的示意图,它属于

西南位育2016学年第二学期英语周练(五)

西南位育初三2016学年第二学期英语周练(五)

III. Complete the following passage with the words or phrases in the box. Each

novels, plays, travel books, and so on. And in reading books of this kind the important thing is to get on with the reading; to try to grasp (领会) __50__ the writer is going to tell you in the book as a whole (整体而言). This is __51__ if you stop and think over the meaning of every single word which happens to be unfamiliar (不熟悉). You can not enjoy a story if you stop lots of times on every page for __52__ words in the dictionary. You may even prevent __53__ from understanding the story as a whole by doing this. V. Complete the following sentence as required. 64. Tell Jerry the news when you see him, please. (否定句) Please ______ ______ Jerry the news when you see him. 65. I was born on June 4, 1992. (对划线部分提问) ______ ______ you born? 66. The detective discovered some important clues for the case. (改为被动语态) Some important clues for the case ______ ______ by the detective. 67. The poor child was so lucky that she received many books from the charity. (改为简单句) The poor child was ______ ______ to receive many books from the charity. 68. To stop wild animals getting close to us, we lit a fire in the forest. (保持句意不变) To ______ ______ wild animals, we lit a fire in the forest. 69. Did they forget to turn off the lights before leaving? I don’t know.(改为宾语从句) I don’t know ______ they ______ to turn off the lights before leaving. 70. Brush your teeth at least twice every day. (改为反义疑问句)

2020高二英语上学期周练8

山西省××市和诚高中2018-2019学年高二英语上学期周练8 时间:60分钟总分100分出题人: 2018年10月21日 一、完形填空(每题2分,共40分) A cactus(仙人掌)stood all alone in the desert, wondering why it was stuck in the middle of nowhere. “I do nothing but 1 here all day,” it sighed.“What 2 am I ? I'm the ugliest plant in the desert. I can't 3 any passing traveler with shade or juicy fruit.I don't see what I can do 4 .”All it did was stand in the sun day after day, growing taller and fatter.Its spines grew longer and its leaves tougher…It truly was st range-looking. “I wish I could do something useful,” it 5 .By day, eagles circled high overhead.“What can I do with my life?” the cactus called.Whether they heard or not, the eagles sailed 6 . At night, the moon floated into the sky and 7 its pale light on the desert.“What good can I do with my life?” the cactus called.The moon only stared coldly as it went on its way. A lizard(蜥蜴)moved by, 8 a little trail (痕迹)in the sand with its tail.“What worthy thing can I do?” the cactus called.“You?” the lizard laughed, pausing a moment.“Worthy deed? Why, you can't do 9 ! You do nothing but get uglier every day.” And so it 10 year after year.At last the cactus grew 11 , and it knew its time was short.“Oh, God” it cried out, “I've 12 so long, and I've tried so hard. 13 me if I've failed to find something worthy to do.I am afraid that now it is too 14 .” But just then the cactus felt a strange stirring and unfolding.A flow of joy drove away all 15 . At its very tip, like a sudden crown, a beautiful 16 suddenly opened. 17 had the desert known such a blossom. Its fragrance went through the air far and wide and brought 18 to all passing by. In the desert, a voice was sounding.“You have waited long, and the heart which seeks(寻求)to do good will always bring something 19 to the world, something for which all can be happy ---- 20 for only a moment.” 1. A. lie B. sit C. sleep D. stand 2. A. good B. advantage C. use D. help 3. A. provide B. lend C. offer D. make 4. A. after all B. at last C. at all D. in all 5. A. smiled B. stated C. announced D. sighed 6. A. away B. out C. up D. down 7. A. turned B. threw C. lit D. burnt 8. A. sweeping B. running C. leaving D. passing 9. A. anything B. nothing C. something D. everything

5—16学年高二生物周练试题(2015 (16)

兴国三中高二生物周周练(十二) 一、选择题(每题2分,共50分) 1、下列物质中,可在血浆中找到的有 A、甲状腺激素、氧、尿素、小分子蛋白质 B、氨基酸、纤维素、CO2、Na+ C、胃蛋白酶、Ca2+、葡萄糖 D、呼吸酶、脂肪酸、尿酸、胆固醇 2、大量的组织液积累在细胞间隙会导致组织水肿。下面的诸多因素中,可能引起病人组织水肿的是 ①毛细血管壁破损②长期蛋白质营养不足③淋巴管阻塞 ④花粉等过敏原引起毛细血管的通透性增加⑤肾炎导致血浆蛋白丢失 A、①②③ B、②③④ C、①③⑤ D、①②③④⑤ 3、关于正常情况下组织液生成与回流的叙述,错误的是 A、生成与回流的组织液中氧气的含量相等 B、组织液不断生成与回流,并保持动态平衡 C、血浆中的有些物质经毛细血管动脉端进入组织液 D、组织液中的有些物质经毛细血管静脉端进入血液 4、内环境稳态是维持机体正常生命活动的必要条件,下列叙述错误的是 A、内环境保持相对稳定有利于机体适应外界环境的变化 B、内环境稳态有利于新陈代谢过程中酶促反应的正常进行 C、维持内环境中Na+、K+浓度的相对稳定有利于维持神经细胞的正常兴奋性 D、内环境中发生的丙酮酸氧化分解给细胞提供能量,有利于生命活动的进行 5、如图代表肌细胞与环境的物质交换关系,X、Y、Z表示三种细胞外液。下列叙述错误的是 A、若饮食过咸,则Y中渗透压会升高 B、X中的大分子物质可通过Z进入Y C、肌细胞的代谢产物可能导致X的pH降低 D、X、Y、Z理化性质的稳定依赖于神经调节 6、下列关于内环境的叙述,正确的是 A、内环境的渗透压下降会刺激下丘脑分泌抗利尿激素增加 B、内环境是一个主要由H2PO4-/HPO42-构成的缓冲体系 C、内环境是机体进行正常生命活动和细胞代谢的场所 D、内环境的变化会引起机体自动地调节器官和系统的活动 7、如图为某反射弧的部分模式图,下列叙述正确的是 A、a商可以与效应器相连接,b端可以与感受器相连接

高中英语下学期第6周周练题

四川省宜宾市一中2017-2018学年高中英语下学期第6周周练题

To keep hope is one of the best ways to achieve 19 ,so never tell yourself "There is 20 left." because as long as you try to search,you can always find that "pear" to pull you through. 1. A. years B. months C. weeks D. days 2. A. smooth B. hopeless C. impossible D. terrible 3. A. forest B. desert C. garden D. village 4. A. once B. ever C. never D. always 5. A. Before B. After C. When D. Since 6. A. sewed B. covered C. matched D. cleaned 7. A. tied B. put C. pulled D. equipped 8. A. rain B. fog C. sandstorm D. snowstorm 9. A. apple B. pear C. orange D. banana 10.A. at most B. at least C. on time D. on purpose 11.A. to B. on C. of D. about 12.A. fear B. joy C. shock D. excitement 13.A. Altogether B. Besides C. Therefore D. However 14.A. stand up B. look up C. give up D. put up

【英语周练】2020春高二下学期英语周练(五) (Unit21 Lesson1)附答案

2020春高二下学期英语周练(五)(Unit21 Lesson1) 时间40分钟总分75分 一完形填空(30分) That holiday morning I didn’t have to attend school. Usually, on holidays, Mother ___1___ me to sleep in. And I would certainly take full advantage of it. On this particular morning, ___2___, I felt like getting up early. I stood by my window overlooking the ___3___, having nothing better to do. But as it turned out, I was soon to learn about something ___4___ in life. As I watched several people go by, get into their cars and drive off, I ___5___ an old man on a bicycle with a bucket on its ___6__ and a basket of rags and bottles on its back-carriage. He __7___ from one car to another, washing and cleaning them. From the water on the ground, it seemed that he had already __8___ washing and cleaning about a dozen or more cars. He must have begun to work quite early in the morning. Several thoughts ___9___my mind as I watched him work. He wasn’t well-dressed. He had on a pair of shorts and a(n) ___10__ T-shirt. The bicycle he rode was not by any means the kind modern ___11___would want to be seen riding on. But he seemed ___12___ with life. There he was, working hard at his small business, ___13___ at passers-by and stopping to chat now and then ___14___ elderly men and women on their way to the market nearby. There was a noticeable touch of__15___ in the way he seemed to be doing things—___16___the windscreen (挡风玻璃), then standing back to admire it;

2021年高二下学期生物周练试卷(实验班4.17) 含答案

2021年高二下学期生物周练试卷(实验班4.17)含答案 一、选择题(每小题只有一个选项符合题意,每小题2分,共60分) 1.荧光标记是将荧光基团共价连接到蛋白质、核酸等分子上的过程,被荧光标记的分子通常可以用荧光显微镜等进行观察.在生物学研究中,可通过显微注射的方法将标记过的抗体注入细胞来检测特定的生物大分子.下列有关叙述,正确的是() A.利用抗原﹣﹣抗体特异性结合标记特定的抗体 B.利用标记的抗体可观察活细胞有丝分裂过程中染色体的行为变化 C.利用标记的抗体研究光反应过程中H 2O的光解和暗反应过程中CO 2 的固定和还 原过程 D.利用标记的抗体可观察分泌性蛋白的合成和分泌过程 2.Le基因是豌豆株高性状的决定性基因,与赤霉素合成有关,其2个等位基因(符号T、t)只相差1个核苷酸.隐形基因t产生的酶活性(反应效应)相当于正常酶的.下列叙述中正确的是() A.Le基因通过控制相关酶的合成控制赤霉素合成 B.TT和tt的杂交产生的一个F 1 植株具有的酶活性将是正常植株中酶活性的C.用赤霉素处理tt植株,不能使它生长为高植株 3.某湖泊由于大量排入污水,藻类爆发,引起水草(沉水植物)死亡,之后浮游动物及鱼类等生物死亡,水体发臭.下列有关叙述中,错误的是()

A .导致水草死亡的最主要非生物因素是缺少阳光 B .藻类刚爆发时,某小组分别于早晨和下午在该湖泊的同一地点、同一水层取 得两组水样,测得甲组pH 为7.3,乙组pH 为6.0,那么取自早晨的水样是乙组 C .更多水生生物死亡又加重了水体污染,这属于负反馈调节 D .藻类刚爆发时,若投放食浮游植物的鱼类和种植大型挺水植物有利于修复 4.科技小组的同学设计了以下实验来验证生态系统的一些相关问题:制作4个密闭、透明 的生态瓶、各瓶内的成分和条件见下表.表中“1”表示有,“0”表示无.下列相应的评述正确 的是( ) 编号 生态系统的组成成分 光照 水草 藻类 浮游动 物 小鱼 河 泥 甲 1 1 1 1 0 1 乙 0 1 1 1 0 1 丙 1 1 1 1 0 0 丁 1 1 1 1 1 1 ①乙成分缺失,功能不健全,存活时间可能最短 ②甲和丁的成分全面,设计合理,可以长时间地存活下去 ③四个人工生态系统的设计合理与否,均需要经受时间的检验 ④四个人工生态系统的物质循环均是封闭的,而能量的流动是相对开放的 ⑤丁的结构与功能处于相对稳定的状态. A .①③④ B .②④⑤ C .①②③④ D .①③④⑤ 5.如图表示种群的各个特征之间的关系,下列叙述正确的是( ) A .甲为出生率和死亡率,乙为迁入率和迁出率 B .丙为性别比例,主要通过影响出生率来间接影响种群密度 C .丁为年龄组成,每种类型中包括老年、中年和幼年三个年龄期 D .种群密度是种群最基本的数量特征,调查方法有标志重捕法和取样器取样法 6.模型方法是现代科学方法的核心内容之一,下列有关叙述中不正确的是( ) A .“建立血糖调节的模型”模拟活动本身属于构建动态的物理模型,之后根据活动中体会构 建的为概念模型 B .“制作DNA 分子双螺旋结构模型”、“细胞膜的流动镶嵌模型”、“建立减数分裂中染色体 变化的模型”都属于构建物理模型 C .对达尔文的自然选择学说的解释模型属于构建概念模型 D .建构数学模型的研究基本过程为:观察研究对象→提出问题→提出合理假设→根据实验 数据,用数学形式表达事物的性质 7.下列有关生物与环境的叙述,其中错误的有几项( )

相关主题
相关文档 最新文档