高二英华作业8
姓名班级学号
1．A和B是属于同一生物体内的两个细胞，通过对其DNA分子含量的测定发现，A细胞中的DNA含量是B细胞的两倍，最可能的解释是（）A．A细胞是有丝分裂过程中中心体相互分离时的细胞，B细胞是减数分裂过程中着丝点分裂染色体移向两极的细胞
B．A细胞是正常的体细胞，B细胞处于减数第一次分裂结束时的细胞
C．A细胞是处于有丝分裂前期的细胞，B细胞处于有丝分裂后期的细胞
D．A细胞是处于有丝分裂后期的细胞，B细胞处于有丝分裂前期的细胞
2．某动物一个卵原细胞经过减数分裂产生的次级卵母细胞中的DNA分子含量为4a，则其同种动物的初级精母细胞的DNA分子含量和体细胞的DNA分子含量分别为（）A．8a和8a B．8a和4a C．4a和4a D．4a和2a
3．下列符号代表精子的染色体，a和a/、b和b/、c和c/为同源染色体，下列来自同一精原细胞的精子是（）A．abc/、ab/c、ab/c、abc B．a/bc、ab/c、ab/c、a/b/c/
C．ab/c/、a/bc、a/bc/、abc D．ab/c、a/bc/、ab/c、a/bc/
4．下列关于同源染色体的叙述中，正确的是①同源染色体一条来自父方，一条来自母方②同源染色体是由一条染色体经过复制而成的两条染色体③同源染色体的形状和大小一般都相同④在减数分裂中配对的两条染色体（）
A．①②③ B．①②④ C．①③④ D．②③④
5．下列有关受精作用的叙述中，错误
．．的一项是（）A．受精卵中全部遗传物质，来自父母双方的各占一半
B．受精时，精子和卵细胞双方的细胞核相互融合
C．受精卵中染色体数与本物种体细胞染色体数相同
D．受精卵中染色体，来自父、母双方的各占一半
6．在四倍体西瓜植株的花朵上，去雄后授以普通二倍体西瓜的花粉，发育成的西瓜果皮、胚及发育过程中胚乳细胞中的染色体组的数目分别是（）A．3、3、5 B．4、3、3 C．4、2、3 D．4、3、5
7．性染色体为(a)xy和(b)yy的精子产生的原因是（）A．a减Ⅰ分裂不分离，b减Ⅰ分裂不分离
B．a减Ⅱ分裂不分离，b减Ⅱ分裂不分离
C．a减Ⅰ分裂不分离，b减Ⅱ分裂不分离
D．a减Ⅱ分裂不分离，b减Ⅰ分裂不分离
8．与有丝分裂相比较，只发生在减数分裂过程的是（）
①染色体复制②同源染色体配对③细胞数目增多
④基因重组⑤基因分离⑥着丝点分裂
A．②④⑤B．②③④C．④⑤ D．②④
9．青蛙在水中完成受精作用，受精过程可分为下列步骤，其中体现受精作用实质的是（）A．同类精子与卵细胞互相识别 B．精子头部进入卵细胞内部
C．卵细胞膜增厚形成受精膜D．精子细胞核与卵细胞核互相融合
10．下图是按顺时针方向表示的4种植物细胞的细胞周期，其
中说法正确的是（）
A．图中的b→a→b表示细胞增殖过程的一个细胞周期
B．甲图的b→a与丙图的b→a所用的时间可能一样长
C．从a→b，由于DNA的复制使染色体数目增加一倍
D．观察植物细胞有丝分裂的实验材料最好是选植物甲
11．下图表示某动物的某个器官中的一些细胞图像。请据图
回：
（1）综合分析可以断定，该生物的体细胞内含有________________条染色体。
（2）A细胞核内含有个DNA分子。
（3）D细胞处在________________期，B细胞正在进行__________分裂。
（4）具有同源染色体的细胞有_______________。（用图中字母表示）
（5）图中细胞分裂所需要的能量由____________提供，它主要是由_____________（细胞器）产生的。
（6）如果F是E细胞分裂形成的两个子细胞中靠下方的那个，请绘出形成F的细胞处于中期时染色体、中心体、纺锤体的图像。
（7）在图中B细胞的下一分裂时期为________________期，并且这一时期的主要特点是_________________________。B细胞分裂形成的子细胞的名称是________________。（8）若图示的细胞是由A细胞经连续的变化得到的：那么图中所示的细胞分裂可能发生在______________；用图中的字母表示出细胞连续变化的先后顺序_________________。
1、B
2、D
3、D
4、A
5、C
6、B
7、D
8、B
9、B
10． (1)E；//C (2)两；//四 (3)四分体(联会)；//交叉互换 (4)A；//初级 (5)A、B、C、E、F；//非姐妹染色单体交叉互换；//A、B、C(或B与C)；//自由组合；//A、B、
C、D、E、F；//A、B、C (6)B、C、D；//F（上一次作业答案）
高二英语寒假作业（八） 第一部分 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) 阅读下列列短文，从每题所给的四个选项(A、B、C和D)中,选出最佳选项。并在答题卡上将该选项涂黑． A One reaction to all the concern about tropical deforestation(砍伐森林) is a blank stare that asks the question, "Since I don't live there, what does it have to do with me?" The answer is that your way of life, wherever you live in the world, is tied to the tropics in many ways. If you live in a house, wash your hair, eat fruits and vegetables, drink soda, or drive a car, you can be certain that you are affected by the loss of tropical forests. Take rubber（橡胶） for example. For many uses, only natural rubber from trees will do. Synthetics are not good enough. Today over half the world's commercial（商业的）rubber is produced in Malaysia and Indonesia, while the Amazon's rubber industry produces much of the world's four million tons. And rubber is an important material in making gloves, balloons, footwear and many sporting goods. Thousands of other tropical plants are valuable for their industrial use. Many scientists strongly believe that deforestation contributes to the greenhouse effect—or heating of the earth from increased carbon dioxide in the atmosphere. As we destroy forests, we lose their ability to change carbon dioxide into
第二十天 单项选择 1、He gave himself a new name to hide his _____ when he went to carry out the secret task. A.emotion B.talent C.identity D.treasure 2、Chatting online can be ________ fun, but kids must be sure they stay safe on ________ web. A.不填; a B.a; the C.不填; the D.a; a 3、My brother would like to buy a good watch but was available from that shop. A.nothing B.none C.no one D.neither 4、— Why does Lucy look worried? —She may have failed the interview, and _____, she won’t be able to pay f or the electric bill. A.in her case B.in any case C.in which case D.in that case 5、As Daisy walked in she could feel the tension in the room, with her mother ______ herself straight in her chair. A.seating B.seated C.to seat D.to have seated 阅读理解 6、Welcome to the North Pole Adventure
高二生物寒假作业（一） 1.下列可以看作一个种群的是（） A、一个池塘中的鱼 B、一片草地上的所有昆虫 C、一个农贸市场的鸡 D、一个公园里的所有日本樱花 2.若用一显微镜观察同一标本4次，每次仅调整目镜或物镜和细准焦螺旋，结果如图所示试问其视野最暗的是（） 3.在显微镜的低倍镜下，看到一个细胞偏向左上方，转换高倍镜观察前应该把该细胞移到视野中央，具体做法是( ) A．向左上方移动载玻片B．向右下方移动载玻片 C．移动载玻片上的样品D．调节准焦螺旋 4.下列关于使用高倍镜的叙述中，正确的是 ( ) A．因为藓类的叶片大，在高倍镜下容易找到，所以可以直接使用高倍镜观察 B．进行低倍镜与高倍镜的转换时，扳动物镜转动较省力 C．换高倍镜后，必须先用粗准焦螺旋调焦，再用细准焦螺旋调至物像最清楚 D．为了使高倍镜下的视野亮一些，可使用较大的光圈或凹面反光镜 5．下列关于细胞学说的叙述中，不准确的是( ) A．细胞是一个有机体 B．细胞都是一个完全独立的单位 C．细胞只能来自细胞 D．一切动植物都是由细胞构成 6.下列各项中，不具有细胞结构的是（） A、细菌和变形虫 B、烟草花叶病毒和噬菌体 C、真菌和草履虫 D、蓝藻和乳酸菌 7.下列四组生物中，都属于真核生物的一组是( ) A．病毒和柳树 B．细菌和草履虫 C．蓝藻和酵母菌 D．青蛙和酵母菌8．在生物体内含量极少，但对于维持生物体的正常生命活动必不可少的元素有( ) A．Fe、Mn、Zn、Mg B．Zn、Cu、Mg、Ca C．Zn、Cu、B、Mn D．Mg、Mn、Cu、Mo 9．糖类、脂肪、蛋白质、核酸共有的元素是( ) A． C、H、O、N、P B． C、H、O、N C． C、H、O D． O、H 10.在下列几组化学元素中，构成细胞膜所必需的元素是( )。 A．C、H、O B．C、H、O、P C．C、H、O、N D．C、H、O、N、P 11.20种氨基酸的平均分子量为128，由100个氨基酸构成的蛋白质，其相对分子量为（） A.12800 B.11018 C.≥11018 D.≤12800 12．血红蛋白分子中含有4条多肽链，共由574个氨基酸构成，则血红蛋白分子中含有的肽键和至少含有的游离氨基和羧基数分别是（） A．574、574、574 B．570、570、570 C．574、4、4 D．570、4、4 13. 下列分子中，与构成生物体的蛋白质的氨基酸分子式不相符的是（）
一、阅读下面的文字，完成1～3题。 一段时间以来，词曲都带有浓厚中国韵味的“古风音乐”渐渐走红。当雅致的文字被谱成唯美的歌曲，诗词歌赋的意象，文人墨客的掌故，以全新的方式呈现在人们耳边，人们发现：()。从十几年前贴吧的古风填词、游戏论坛的配乐翻唱，古风音乐在产生初期就有着网络的色彩。自发创作的歌曲层出不穷，专职、兼职的“古风圈大神”不断涌现。而“95后”甚至“00后”的“新人”，也________地变为古风音乐的主要受众。事实上，除了古风音乐，宽衣博带的古风服饰，裙袂飘飘的古风舞蹈，都获得了不少拥趸。或是对快节奏生活感到疲惫厌倦，或是被古典之美深深折服，选择古风，也是对中华文明的归属与认同。 但“古风”作为一个________的集合，内涵也需要甄别。先秦诸子是古，魏晋风骨是古，宣德红釉成化斗彩是古，八大山人桐城古文也是古，到底哪一阶段应该蔚然成“风”？其实，古风不同于古史。后者讲究准确，前者但求神似。古风音乐的文辞，无论是小人物的悲欢，还是宏阔的大历史，往往出于现代人对古代的建构与想象。所以，有的作品脱离了具体的历史语境，夹杂了神怪小说、玄幻游戏，甚至________的爱情故事、堆砌辞藻的“大杂烩”时有出现。换句话说，“古风”走红，________的作品也就有了可乘之机，尤需受众提高鉴别力。 1.下列在文中括号内补写的语句，最恰当的一项是() A.虽说是古风，却处处有新意，古风音乐给传统带来一种新的“打开方式” B.古风音乐给传统带来一种新的“打开方式”，虽说是古风，却处处有新意 C.处处有新意的古风音乐给传统带来一种新的“打开方式” D.古风音乐处处有新意，给传统带来一种新的“打开方式” 2.依次填入文中横线上的成语，全都恰当的一项是() A.水到渠成包罗万象矫揉造作鱼龙混杂 B.水到渠成一应俱全无病呻吟鱼龙混杂 C.顺理成章包罗万象无病呻吟鱼目混珠 D.顺理成章一应俱全矫揉造作鱼目混珠 3.文中画横线的句子有语病，下列修改最恰当的一项是() A.古风音乐的文辞，无论是大历史的宏阔，还是小人物的悲欢，往往出于现代人对古代的想象与建构。 B.古风音乐的文辞，无论是大历史的宏阔，还是小人物的悲欢，往往出于现代人对古代的建构与想象。 C.古风音乐的文辞，无论是小人物的悲欢，还是大历史的宏阔，往往出于现代人对古代的想象与建构。 D.古风音乐的文辞，无论是大历史的宏阔，还是小人物的悲欢，往往出于现代人对古代的想象与建设。
新课标2015年高二英语暑假作业10 （满分100分） 第二部分阅读理解（共两节，满分30分） 第一节（共4小题；每小题5分，满分20分） 阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题 卡上将该项涂黑。 For some reason we were reminded that we primates(灵长目) need love. Kim Bard of the University of Portsmouth in England and her colleagues carried out a study on 46 baby chimpanzees orphans(黑猩猩孤儿), which had lost their mothers. The study showed that primate babies that have tight relationships with mother figures do much better on cognitive (认知的 ) tests than babies who only grew up with peers (同伴), but this is not breaking news. In fact, it ' s old news. In the 1950s, Harry Harlow did a series of experiments with baby monkeys that showed. that lack of love and comfort makes for a crazy monkey. Harlow constructed a cage that included a wire monkey "mother" with a plastic face. Then he equipped the "mother" with a milk bottle .The cage also had another wire "mother" who was covered with soft cloth. The baby monkeys spent all their time with the cloth "mother" arid only went to the wire "mother" to feed. Harlow's monkey experiment was important because, at the time, child care experts, and everybody's grandmother had a "no touch, no comfort" policy toward children. They advised parents not to respond to crying babies. They thought that babies should sleep alone to become independent, and for God's sake put that kid down. But Harlow's work changed that policy. Mothers were soon permitted to have their babies next to them in the hospital. The current chimp research based on Harlow's work shows that mother's love doesn't just make for a psychologically(糖神上地) healthy child, it also makes for a smart child. The highly raised chimps do better than those that are not loved, and the well-raised chimps do even better than human kids on IQ tests. We are primates, social animals which need love. We need to be held and talked to and made to feel that at least one person wants to be with us all the time. 1. The study Kim Bard and his colleagues did A. included 46 baby and mother monkeys B. is nothing new to people about the findings C. showed that many chimpanzees lack of love when they were young D. showed many chimpanzees had good relationship with their mothers 2. Harlow built two "mothers" for baby,.monkeys to _______ A. make them live comfortably B. let them have more choices
高二年级英语寒假作业（一）语法 1. The girl was seriously _______ when her hair _____________ as she was cooking the other day. A. burnt, caught fire B. to burnt, catch fire C. burning, catching fire D. burn, to catch fire 2. The voice was _____________ in the noise from the airplane. A. expressed B. drowned C. wounded D. threatened 3. There was a _______ all over the country when SARS started to spread last year. A. cheer B. alarm C. panic D. prosper 4. I saw his cut __________ onto the ground when I got home last night. A. to bleed B. bleeding C. stress D. stressing 5. Two people passing by _________ the thief steal the lady’s purse earlier this afternoon. A. witnessed B. witnessed to be seen C. witnessed seeing D. witnessed to see 6. How much you eat is important , but _____ you eat daily ______ more. A. where , means B. what, counts C. how, minds D. why, values 7. The doctor recommended my father that he ________smoking and ____ more exercises to keep fit. A. stop, do B. stopped, did C. will stop, do D. should stop, did 8. We wish all the people from different cultural backgrounds could live _________ in the future. A. in press B. in summary C. in harmony D. in willingness 9. Many people began to doubt whether________ God or not. A. exists B. there exists C. it exists D. exists here 10. After the quarrel, he never went there again, ________ to explain. A. or he ever wrote B. nor he ever wrote C. but did he write D. neither did he write 11. Only by practicing as much as you can, ________ to make progress in English. A. you will be able to B. will you be able to C. you can be able to D. can you be able to 12. There is ___________ to their building from the main street, so you have to go round about . A. no issue B. no content C. no alternative D. no access 13. If the people get better educated and the world becomes less unfair, much of the poverty can be ____________. A. worked out B. wiped out C. left out D. cleaned out 14. Not until ________ more about the situation, _______ improve it. A. we learned, were we able to B. did we learn, we were able to C. we learned, we were able to D. did we learn, were we able to 15. The children nowadays are well ___________ all kinds of harm by their parents and the teachers. A. defended against B. defending from C. defended with D. to defend to 16. Not only _________ a place to have classes, but also _____ as a dinning room during lunch time. A. our classroom is, is it used B. is our classroom, it is used C. our classroom is , it is used D. is our classroom, is it used 17. I’ll wait for you at our school gate, beside which _________ . A. stands a tall red building B. a tall red building stand C. is a tall red building standing D. a tall red building is standing 18. If I _______ you , I ________ treat my friend like that. A. am , would not B. was , will not C. were , would not D. are, will not 19. I ______________ them when the accident happened, if I ____________ more about how to give first aid. A. could help, knew B. could help, had known C. could have helped, would know D. could have helped , knew If I _____a chance to travel to the moon, I _______ back something from there. A. have, will take B. had, would bring C. would have, would have brought D. were to have, would have brought 21. Out __________ as soon as they heard the bell . A. do the children rush B. did the children rush C. the children rush D. rushed the children 22. Y ou don’t have to come with us, if you don’t ___________. A. want to do B. want to come with C. want to D. want to doing it 23. After they retired , they ____________ in Europe for a few months. A. journeyed to B. traveled at C. knocked about D. voyaged around 24. It’s too early to say that your team ________, there is still a chance to win. A. was finished B. is beat C. will defeat D. is done for 25. Everybody was _________ by the earthquake which happened last week. A. spotted B. terrified C. frightening D. fleeing 26. It was _________ that he should be seriously punished for what he did to the people. A. urged B. upset C. whispered D. swear 27. While the policeman was examining the house, a drop of blood on the floor ____. A. paid his attention B. drew his attention C. attract his attention D. enter his attention 28. He __________ to a comfortable position. A. rolled over B. turned down C. kept up D. went upside down 29. _________ arrival, my uncle hugged Pompy and tried to give him courage. A. At B. By C. With D. Upon 30. Never ________ that water is so precious before I read the article.
2019-2020学年高二生物人教版寒假作业：（7）植物生长素的发 现 1、下面是生长素发现过程中的部分实验示意图，根据图中信息判断，下列说法不正确 ．．．的是( ) A．实验一证明感受单侧光刺激的是胚芽鞘尖端 B．实验二证明胚芽鞘尖端产生的刺激可以通过琼脂片传递给下部 C．实验三证明胚芽鞘的弯曲生长，是尖端产生的刺激在其下部分布不均匀造成的 D．实验四证明造成胚芽鞘弯曲的刺激是一种化学物质 2、下列关于生长素发现过程的叙述，错误的是( ) A.达尔文提出单侧光使胚芽鞘尖端产生生长素，造成背光面生长快引起向光弯曲 B.鲍森·詹森通过实验证明胚芽鞘尖端产生的影响可以透过琼脂片 C.拜尔的实验证明胚芽鞘的弯曲生长是因为尖端产生的影响在其下部分布不均造成的 D.温特的实验证明造成胚芽鞘弯曲的影响是一种化学物质并命名为生长素 3、下面是植物生长素发现过程中的几个经典实验,据图分析,相关实验结论叙述正确的是( ) A.鲍森·詹森实验说明胚芽鞘的尖端产生的IAA可以透过琼脂片传递给下部 B.拜尔认为胚芽鞘弯曲生长的根本原因是尖端产生的生长素在其下部分布不均匀 C.温特认为胚芽鞘的尖端确实产生了某种促进生长的物质,这种物质可由尖端向下运输,促进
下部的生长 D.达尔文认为单侧光对胚芽鞘的尖端产生某种影响,该影响传递到下部,使向光面生长比背光面更快,胚芽鞘向光弯曲生长 4、如图是取自生长素发现过程中的一些经典实验示意图,结合所学知识,下列说法中错误的是( ) A.图①取自达尔文实验,可用于探究植物的感光部位 B.图③取自鲍森?詹森实验,其结论是胚芽鞘尖端产生的影响可以透过琼脂片 C.图⑤是温特实验的实验组,其对照组使用的是未接触胚芽鞘尖端的琼脂块 D.图①②④都能验证胚芽鞘尖端产生的物质因单侧光的照射而发生横向移动 5、1914年,匈牙利的科学家拜尔将燕麦胚芽鞘尖端放在去除胚芽鞘尖端的一侧,结果胚芽鞘向对侧弯曲生长。下列有关叙述正确的是( ) A.该实验证明尖端确实能产生某种物质,该物质是吲哚乙酸 B.该实验在黑暗中进行,可排除受光不均匀对实验结果的影响 C.该实验证明了生长素在植物体内进行极性运输 D.对照组是没有尖端的胚芽鞘,结果不生长 6、科学家温特做了如下实验:把切下的燕麦尖端放在琼脂块上,几小时后,移去胚芽鞘尖端,将琼脂块切成小块,再将经处理过的琼脂块放在切去尖端的燕麦胚芽鞘一侧,结果胚芽鞘会朝对侧弯曲生长。但是,如果放上的是没有接触过胚芽鞘尖端的琼脂块,胚芽鞘则既不生长也不弯曲。该实验证明了( ) A.生长素只能从形态学上端运输到形态学下端 B.造成胚芽鞘弯曲的刺激是某种化学物质 C.生长素的化学本质是吲哚乙酸 D.胚芽鞘会弯向光源生长 7、胚芽鞘产生生长素的部位、感受单侧光的部位和弯曲生长的部位分别是（） A．尖端、尖端、尖端B．尖端、尖端、尖端下部 C．尖端、尖端下部、尖端下部D．尖端、尖端下部、尖端
2020高二地理寒假作业答案 导读：本文是关于2020高二地理寒假作业答案，希望能帮助到您！ 1.(12分)(1)长江流域面积广，地处湿润气候带，降雨量大且暴雨集中，植被破坏严重。(3分) (2)植被覆盖率较高(1分) (3)黄河流域大部分地区土质疏松，植被覆盖率低(2分) (4)水土流失导致河流含沙量增大，河床淤积，蓄洪泄洪能力减弱;湖泊淤积，导致调蓄洪水能力降低;水库淤积，降低水库防洪标准。(6分) 2 ⑴沪宁杭、矿产资源(能源、原料)⑵经大秦线至港口，再海运至长江三角洲(上海)⑶有色金属、湘黔⑷水电、天然气(核电) 3(1)耕地面积扩大，沼泽面积缩小生物多样性减少，水旱灾害性增多，气候变干(2)松花江主要流经平原地区，水流平稳;沿岸人口和城市较密集(3)开垦年限越久，土壤质量指数越低，退化越严重土壤侵蚀的加剧和不合理的耕作制度 (4)ABEF 4(1)55(2分) (2)B(2分) 与A相比，B地在冬季处背风向阳的南坡，热量条件优于A地台风;偶尔南下的冷空气影响;春季多阴雨等。(6分) (3)AB(4分) (4)如图所示(2分) 5.(1)、填出序号代表的地形区名称。 ①秦岭②渭河平原(谷地) ③汉水谷地(平原)。 (2)、气温随地势或海拔的升高而降低。 (3)山地迎风坡(南坡)降水多，背风坡降水少(答出山地迎风坡降水多可得分)。
(4)、900(850一950均可) (6)华北的春旱，东北和华北的冬季的寒潮，夏秋季的洪涝等 (7)使河湖酸化，影响鱼类生长繁殖，乃至大量死亡;使土壤酸化，危害森林和农作物生长;腐蚀建筑物和文物古迹，并危及人体健康。 6.(8分)读我国某区域沿东经106.5°所作的地形剖面及气候资料图，分析回答： (1)2℃，800mm。 (2) (AC) (3)四川盆地。 (4)阴雨，位于昆明准静止锋冷气团一侧。 7、(1)受季风气候影响，径流季节变化量较大(1分)上游落差大，水流急，不利于航运(1分) 受海洋气候影响，径流季节变化小，(1分)地势平坦，大部分河段水流平稳(1分) (2)长江中下游平原 C (各1分) (3)汉水武汉 (各1分) ACDF (2分) 8、(1)CD(2分) (2)有色金属矿产丰富水电丰富(2分) (3)立体农业，春季低温阴雨，夏季干热少雨(伏旱)(3分) (4)围湖造田，河流泥沙淤积(2分) (5)武汉水陆交通便利，靠近煤产地，钢铁、机械工业发达、协作条件好，有多所高等院校及科研机构，技术力量雄厚(劳动力素质高)农业基础好。(4分) 9.(11分) (1)均为地上河 (地形)从第二阶梯进入第三阶梯，水流速度迅速降低，泥沙沉积严重，河床抬高，堤坝加高;(植被)上中游地区植被破
2019-2020学年人教版高二英语寒假作业（8） 一、小题练习 1 no modern telecommunications, we would have to wait for weeks to get news from around the world. A.Were there B.Had there been C.If there are D.If there have been 2、Hardly_____got out of the court_____the reporters raised a lot of questions to him. A.had he; when B.had he; than C.he had; when D.did he; than 3、It was too noisy outside. Not until_____at the top of my voice_____his head. A.I shouted; did he turn B.I shouted; had he turned C.did I shout; did he turn D.had I shouted; he turned 4、_____do we go for picnics. A.Certainly B.Sometimes C.Seldom D.Once 5、Not until he retired from teaching three years ago ______ having a holiday abroad. A.he had considered B.had he considered C.he considered D.did he consider 6、So fast__________he walk that I couldn’t catch up with him. 7、Only then__________(do) they realize how much damage had been caused. 8、Only when Lily walked into the office __________(do) she realize that she had left the contract at home. 9、__________ when we lost what we had did we realize how much we loved it. 10、Never before__________she seen anybody who can play tennis as well as Robert. 11、Hardly we left the dormitory the next morning when we realized we had left our map in the room. 12、Not until I had read the report I understand the true state of affairs. 13、He doesn’t like classic music,nor I do. 14、Hardly she finished her homework when her mum asked her to play the piano. 15、Only then did we realized the importance of English.
新课标2016年高二英语寒假作业2 第Ⅰ卷 第二部分阅读理解（共两节，满分60分） 第一节（共15小题；每小题3分，满分45分） 阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。 A A machine that takes sweat-laden clothes and turns the moisture into drinking water is in use in Sweden. The device spins and heats the material to remove the sweat, and then passes the vapor through a special membrane(膜) designed to only let water molecules（分子） get through. Since its Monday launch, its creators say more than 1,000 people have “drunk others’ sweat" in Gothenburg. They add the liquid is cleaner than local tap water. The device was built for the United Nation's child-focused charity UNICEF to promote a campaign highlighting the fact that 780 million people in the world lack access to clean water. The machine was designed and built by engineer Andreas Hammar, known locally for his appearances on TV tech show Mekatronik. He said the critical part of the sweat machine was a new water purification component developed by a company named HVR in collaboration with Sweden's Royal Institute of Technology. "It uses a technique called membrane distillation(膜蒸馏)," he told the BBC."We use a substance that's a bit like Gortex that only lets steam through but keeps bacteria, salts, clothing fibers and other substances out."They have something similar on the International Space Station to treat astronaut's urine - but our machine was cheaper to build. Volunteers have been sampling the treated sweat since the start of the week in Gothenburg .“The amount of water it produces depends on how sweaty the person is - but one person's T-shirt typically produces 10ml , roughly a mouthful."
高二年级生物寒假作业 本学期寒假作业分两部分： 1.整理本学期必修一和必修二各章节的学习笔记，查漏补缺。 2.巩固本期学习内容，完成以下试题。 一、选择题：只有一个正确选项 （）1．豌豆在自然状态下是纯种的原因是 A．豌豆品种间性状差异大B．豌豆先开花后授粉 C．豌豆是闭花自花授粉的植物D．豌豆是自花传粉的植物 （）2．下列叙述正确的是 A．纯合子测交后代都是纯合子B．纯合子自交后代都是纯合子 C．杂合子自交后代都是杂合子D．杂合子测交后代都是杂合子 （）3.将具有一对等位基因的杂合子，自交一代，在其子代中纯合子的比例为 A．1／2 B．1／4 C．2／3 D．1／3 （）4.羊的毛色白色对黑色为显性，两只杂合白羊为亲本，接连生下了3只小羊是白羊，若他们再生第4只小羊，其毛色 A．一定是白色的B．是白色的可能性大 C．一定是黑色的 D．是黑色的可能性大 （）5．在做性状分离比的模拟实验时，分别同时从甲小桶和乙小桶抓取小球50～100次，统计小球组合为DD的比例为 A．1/3 B．1/4 C．1/2 D．1/5 （）6、人类多指畸形是一种显性遗传病。若母亲为多指（Aa），父亲正常，则他们生一个患病女儿的可能性是（） A．50% B．25% C．75% D．100% （）7．下列属于等位基因的是 A．A与b B．Y与y C．E与E D．f与f （）8．减数分裂中，等位基因的分离和非等位基因的自由组合发生在( ) A．形成初级精（卵）母细胞过程中B．减数第一次分裂四分体时期 C．形成次级精（卵）母细胞过程 D．形成精细胞或卵细胞过程中 （）9.分离定律的实质是（） A．F2（子二代）出现性状分离B．F2性状分离比是3：1 C．成对的控制相对性状的遗传因子彼此分离D．测交后代性状分离比为1：1 （）10．下列各杂交组合中，属测交的一组是 A．Aabb×aaBB B．AaBb×AaBb C．AABb×aaBb D．AaBb×aabb （）11、两个杂合子交配，后代只有一种表现型，这两个杂合子是（）A．AABb×aaBb B．aaBb×Aabb C．AABb×AaBB D．AaBb×AaBb （）12、下列哪项最可能不属于配子
寒假作业（23） 一、小题练习 1、I have made ______ a rule that I buy a copy of English Square every month. A.one B.that C.this D.it 2He hasn’t slept at all for three days. ________ he is tired out. A.There is no point B.There is no need C.It is no wonder D.It is no way 3、—Excuse me, can you tell me where I can find a supermarket? —I happen to know nearby. Come on, I’ll show you the way. A. one B. it C. that D. some 4、The chairman thought ______necessary to invite Professor Smith to speak at the meeting. A.that B. it C. this D. him 5、He didn’t make____clear when and where the meeting would be held. A.this B.that C.it D.these
6、The two cars are racing close together —it’s unclear ___________ will be the champion. 7、It remains unknown to the public ______________ ready the newly-elected president is to solve problems such as acid rain. 8、I'd appreciate ____ if you could spread the news at once. 9、I would appreciate _____________ if you can pay in cash. 10、My wife is a shopaholic(购物狂). She is addicted to shopping on the Internet. ____________ seems that she can’t control herself well, just clicking constantly with the mouse. 11、An intelligent mind needs a strong body to make more useful. 12、Our company makes a rule not to smoke in the office. 13、I consider a great honor to be invited to this party. 14、I found that hard to break the bad habit. 15、I find them impossible to master a foreign language without much memory work. 二、根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 It is important for you to be a good listener in class. ①_____ Listening is a cognitive (认知的) act that requires you to pay attention to and think about