寒假作业(九)

一年级上册数学第五单元测评及答案姓名：座号：评分：一、填一填。

1．一共有( )张卡片。

2．从左边数，“9”是第( )张卡片，第8张卡片上的数是( )。

3．最大的数是( )，最小的数是( )。

4．比9大1的数是( )，比8少2的数是( )。

5．从右边数，第2张和第( )张卡片上的数合起来是9。

6．从中选出3个数组成两道加法算式和两道减法算式。

______________ ____________________________ ______________二、想一想，填一填。

三、在正确答案下面的○里画“√”。

1．在中，从左数△所排的位置。

2．选出和8－2的结果相等的算式。

四、看图列式计算。

？个9个？个五、算一算。

3＋4＝5＋2＝4－1＝ 6－3＝9－4＝ 8－5＝4＋6－3＝ 2＋3＋5＝9－5＋4＝ 3＋4－5＝六、在括号里填上适当的数。

3＋( )＝9 2＋( )＝10 5＋( )＝7 ( )＋5＝10 ( )＋3＝7 6＋( )＝8 七、看图回答问题。

1．一共有多少个苹果？2．飞走几只蝴蝶？3．一共有几个蘑菇？4．左边树上有10个苹果，摘走一些后，还剩4个，摘走了几个苹果？5．一共有几条鱼？6．请你再提出一个数学问题，并解答。

八、在○里填上适当的数，使每条线上的三个数相加都得9。

参考答案一、1.8 2.5 5 3.10 1 4.10 6 5.3 6.略二、6 3 7 6 5 1三、1.第7位 2.5＋1四、5＋3＝8 9－4＝5 10－2－1＝7 3＋3＋4＝10五、 7 7 3 3 5 3 7 10 8 2六、6 8 2 5 4 2七、1.4＋3＝7(个) 2.6－3＝3(只) 3.2＋4＝6(个) 4．10－4＝6(个) 5.3＋2＋3＝8(条) 6.略八、。

【原创】高三化学寒假作业（九）一．选择题（共7小题，每个小题只有一个正确选项）2．短周期元素X、Y、Z、W在周期表中的相对位置如图所示，Z的单质是常见的半导体材料．由此可知（）3．右图中，两电极上发生的电极反应分别为：a极：Ag++e﹣=Ag，b极：Fe﹣2e﹣=Fe2+下列说法正确的是（）+2Ag4．下列关于有机化合物的说法正确的是（）称量氢氧化钠固体﹣配制150mL0.10mol/L盐酸6．有一澄清透明溶液，只可能含有大量H+、Fe3+、Fe2+、Al3+、AlO2﹣、CO32﹣、NO3﹣七种离子中的几种，向溶液中逐滴加入一定量1mol/L的NaOH溶液的过程中，开始没有沉淀，而后有沉淀，沉淀达最大量后继续滴加NaOH溶液沉淀部分消失．下列判断正确的是（）﹣此图表示等体积、等pH的盐酸与醋酸溶液加入等量水稀释时的pH变化二．填空题（共3小题）8．运用化学反应原理研究氮、氧等单质及其化合物的反应有重要意义．（1）NH4Cl溶液呈_________（填“酸”、“中”、“碱”）性，其原因是（用离子方程式表示）：_________．（2）在25℃下，向浓度均为0.1mol•L﹣1的MgCl2和CuCl2混合溶液中逐滴加入氨水，先生成_________沉淀（填化学式），生成该沉淀的离子方程式为_________．（已知25℃时K sp[Mg（OH）2]=1.8×10﹣11，K sP[Cu（OH）2]=2.2×10﹣20．）（3）在25℃下，将a mol•L﹣1的氨水与0.01mol•L﹣1的盐酸等体积混合，反应平衡时溶液中c（NH4+）=c（Cl﹣），则溶液显_________性（填“酸”“碱”或“中”）；用含a的代数式表示NH3•H2O的电离常数K b=_________．﹣9．可逆反应Fe（s）+CO2（g）⇌FeO（s）+CO（g），在温度938K时，平衡常数K=1.47，在1173K时，K=2.15（1）写出该反应的平衡常数表达式_________．（2）若该反应在体积固定的密闭容器中进行，在一定条件下达到平衡状态，如果改变下列条件再达平衡后（选填“增大”、“减小”、“不变”）①升高温度，CO2的平衡浓度_________，②再通入CO2，CO2的转化率_________，③增大容器的体积，混和气体的平均分子量_________．（3）该反应的逆速率随时间变化情况如图：①从图中看到，反应在t2时达平衡，在t1时改变了某种条件，改变的条件可能是_________（填序号，答案可能不止一个）a．升温b．增大CO2的浓度c．使用催化剂d．增压②如果在t3时再增加CO2的量，t4时反应又处于新平衡状态，请在图上画出t3～t5时间段的v 变化曲线．逆（4）能判断该反应达到平衡的依据是_________．A、容器内压强不变了B、c（CO）不变了C、v正（CO2）=v逆（CO ）D、c（CO2）=c（CO）10．浅绿色的硫酸亚铁铵晶体[又名莫尔盐（NH4）2SO4•FeSO4•6H2O]比绿矾（FeSO4•7H2O）更稳定，常用于定量分析．莫尔盐的一种实验室制法如下：（1）向废铁屑中加入稀硫酸后，并不等铁屑完全溶解而是剩余少量时就进行过滤，其目的是_________；证明溶液A不含Fe3+离子的最佳试剂是_________（填序号字母）．a．酚酞溶液b．KSCN溶液c．烧碱溶液d．KMnO4溶液操作I的步骤是：加热蒸发、_________、过滤．（2）浓度均为0.1mol•L﹣1莫尔盐溶液和（NH4）2SO4溶液，c（NH4+）前者大于后者，原因是_________．（3）用托盘天平称量（NH4）2SO4晶体，晶体要放在天平_________（填“左”“右”）盘．（4）从下列装置中选取必要的装置制取（NH4）2SO4溶液，连接的顺序（用接口序号字母表示）是：a接_________；_________接_________．﹣将装置C中两种液体分离开的操作名称是_________．装置D的作用是_________．参考答案一．选择题1．C 2．D 3．B4．A5．B6．D7．CNH．3Cu2++2NH3．）中，．）。

2024寒假作业九年级语文全册通用版全文共3篇示例，供读者参考一、积累运用(共33分)1.下列加点字注音全对的一项是（）(3分)a.庇护(pì) 澄澈(chéng) 掺和(he) 杞人忧天(qǐ)b.称职( chèn) 滑稽(jī) 羞怯(qiè) 畏罪潜逃（qiǎn)c.晕眩(xuàn) 虐待(nuè) 鄙薄(bó) 拈轻怕重( niān)d.禁锢(jìn) 惩戒(chéng ) 蜷伏(quán) 参差不齐( cēn)2.下面词语书写全部正确的一项（）(3分)a.篷勃安详神采弈弈怪诞不经b.炫耀惊呀大相径庭惊慌失挫c.徘徊诀别晃然大悟浑为一谈d.帐篷纯粹刨根问底麻木不仁3.下列各句中加点词语运用不正确的一项是（）(3分)a.中国成功地发射了“神舟”十号，这是多么骇人听闻的消息!b.语文老师每每讲到精彩处，会情不自禁地把衣抽越捋越高，连下课时间也忘了。

c.我小心翼翼地伸出左脚去探那块岩石，而且踩到了它。

d.嫦娥三号向太空飞去，美丽的月球已经遥遥在望。

4.下列句子没有语病的一项是（）(3分)a.5月10日，大约百名左右的青年志愿者在云蒙湖附近参加了绿色骑行活动。

b.在暑假的户外活动中，同学们要注意安全，防止不要发生意外事故。

c.为了规范义务教育阶段招生行为，临沂市教育局严禁公办学校招收择校生。

d.将建设美丽乡村和打造文化景区相结合，既能改善农村居住环境，又能发扬文化旅游产业。

5.下列句子中，标点符号使用有误的一项是（）(3分)a.“吹面不寒杨柳风”，不错的，像母亲的手抚摸着你。

b.“哎呀，真是美极了。

”皇帝说：“我十分满意”!c.真是“畏事潜逃”了，我以为。

d.请闭上眼想：一个老城，有山有水，全在蓝天下很暖和安适适地睡着，只等春风来把它们唤醒，这是不是个理想的境界?6.名著阅读(8分)(1)噫!这兵器原是他们随身之宝，一刻不可离者，各藏在身，自有许多光彩护体。

高一化学寒假作业（九）几种重要的金属化合物1．Na2O2在储存和运输时应张贴的标志是()解析：Na2O2具有强氧化性，故应标明氧化剂。

答案： D2．(2010·广元高一检测)下列各组物质与其用途关系不正确的是()A．纯碱：制玻璃B．小苏打：发酵粉C．钾钠合金：原子反应堆的导热剂D．烧碱：治疗胃酸过多的一种药剂解析：烧碱是强碱，具有很强的腐蚀性，不能用于治疗胃酸过多。

答案： D3．鉴别下列各物质，只能采用焰色反应的是()A．K2CO3和NaCl B．KCl和Na2CO3C．NaCl和MgCl2D．NaCl和KCl解析：A、B、C除焰色反应能鉴别外，还可以用澄清石灰水鉴别开。

答案： D4．下列叙述正确的是()A．Na2O与Na2O2都能和水反应生成碱，它们都是碱性氧化物B．Na2CO3溶液和NaHCO3溶液都能跟CaCl2溶液反应得到白色沉淀C．钠在常温下不容易被氧化D．Na2O2可作供氧剂，而Na2O不行解析：Na2O2不属于碱性氧化物，A错；B项NaHCO3与CaCl2溶液不反应，得不到白色沉淀；C项Na在常温下很容易被空气中的O2氧化。

答案： D5．向紫色的石蕊试液中加入过量的Na2O2粉末，振荡，观察到的现象为() A．产生大量气泡B．溶液无变化C．最后溶液变为红色D．最后溶液变为蓝色解析：Na2O2与H2O首先反应放出O2，其次由于Na2O2过量具有强氧化性，又将石蕊漂白。

答案： A6．往碳酸钠稀溶液中加入或通入少量下列物质能反应，但看不到明显现象的是( )A ．Ca(OH)2溶液B ．Na 2O 2固体C ．HCl 溶液D ．CO 2解析： A 项，二者反应产生碳酸钙沉淀；B 项，过氧化钠与水反应时产生氧气；C 项，反应产生二氧化碳气体；D 项，通入二氧化碳气体能与碳酸钠发生反应，但无明显的实验现象。

答案： D7．下列各组物质，在水溶液中发生离子反应HCO －3＋H ＋===H 2O ＋CO 2↑的是( )A ．NaHCO 3＋HCl 溶液B ．Na 2O 2＋NaHCO 3C ．Na 2CO 3＋HCl 溶液D ．NaHCO 3＋Ca(OH)2解析： 题给离子反应表示可溶性碳酸氢盐与强酸反应生成可溶性盐、二氧化碳和水的反应，只有A 项符合。

限时练习：40min完成时间：月日天气：寒假作业09 单项选择巧解单项选择题：1.捕捉时间状语，明确动词时态，选出正确答案。

若出现up to now，so far，since+时间点，for+一段时间等时间状语，则用现在完成时；若出现by the end of last+时间段，by（the time of）+时间段等时间状语，则用过去完成时。

2.分析句子结构，寻找固定搭配，得出最佳答案。

如can’t / couldn’t help doing sth，为固定结构，意为“禁不住做某事”。

3.关键词暗示法：找到句中关键词，便找到了解题的突破口。

4.类推比较法：利用“如果A对，那么B也对”的类推法，从而将AB予以否定。

5.前后照应法：联系上下文，捕捉隐含信息，准确找出答案。

6.逐个排除法：排除干扰项和错误项，缩小选题范围，确定答案。

单项选择1．—Do you know Journey to the West?—Yes. It’s ________ interesting book. I like it very much.A．a B．an C．the D．/2．—Mom, can I talk to you about my job offer, please?—________.A．Go ahead B．I see C．Much better D．Never mind3．（2023·湖北武汉·统考中考真题）—What the headmaster said at the graduation must have stuck in the minds of many students.—________. It was very inspiring.A．I agree B．Thank you C．All right D．My pleasure4．—Who will talk about the development of American country music next week?—I suggest Brad. He ________ in Nashville, the home of country music, since he was a child.A．lives B．lived C．has lived D．will live5．—Peter was picked out to be on the school volleyball team.—His height gives him a big ________.A．situation B．challenge C．achievement D．advantage6．— There are many celebrations in the coming Dragon Boat Festival.—Sounds very interesting. I don’t want to miss ________.A．it B．any C．none D．one7．（2023·湖北武汉·统考中考真题）—Excuse me, but we ________ wait in line to get on the subway.—I’m sorry.A．might B．would C．could D．should8．—Hard to believe. Luke won the school speech contest!—He used to be shy, but his friends’ support ________ his confidence.A．took away B．made up C．put away D．built up9．This famous saying “When I walk along with two others, they may serve me as my teachers” tells us ________.A．how should we treat people B．who we can learn fromC．what did we say in public D．why we need teachers10．It rained. ________, the basketball match was put off.A．After all B．Instead C．Therefore D．However11．（2023·湖北黄石·统考中考真题）International search and rescue (救援) teams have rushed to Turkey to help for the huge earthquakes. China ________ an 82-member China Search and Rescue Team.A．sends B．was sent C．has sent D．has been sent12．—Everyone should build the good habit of saving food.—I agree, so I always ________ the food I order.A．eat up B．use up C．throw away D．give away13．—Could you tell me ________?—About an hour’s drive.A．how long it takes to get to Yangxin B．how long does it take to get to YangxinC．how far is it from Huangshi to Yangxin D．how far it is from Huangshi to Yangxin14．（2023·湖北十堰·统考中考真题）—How did you fix up the machine, dad?—It’s easy. I just followed the ________.A．instructions B．inventions C．interviews D．influences15．—As far as I know, the high-speed railway from Shiyan to Xi’an will be finished soon.—Yeah. It will be more ________ for us to travel to Xi’an.A．dangerous B．difficult C．convenient D．traditional16．（2023·湖北十堰·统考中考真题）My friend promised to come to my birthday party. However, he didn’t ________ in the end.A．give up B．cut up C．show up D．pick up17．I will remember the important people ________ helped and supported me in my life.A．which B．whose C．whom D．who18．—Mr. Fan runs at least half an hour every day.—What a good ________! No wonder he looks healthy.A．habit B．question C．article D．prediction19．（2023·湖北襄阳·统考中考真题）—Does the sports watch belong to Mary?—It ________ be hers. She is the only one who wears the sports watch in our class.A．ca n’t B．must C．might D．could20．—Wow, there are so many people in Tangcheng Scenic Area.—It is always full of visitors, ________ during the holidays.A．actually B．finally C．simply D．especially21．—Cindy! Can you help me pass the level 2 of the game “Word Pu zzle(字谜)”？—Oh, dear. There’s ________ I can do to help you. I can’t pass it, either.A．something B．anything C．everything D．nothing22．—Zibo barbecue(烧烤) is very popular now.—That’s because the whole city ________ tourists.A．is worried about B．is friendly toC．is afraid of D．is harmful to23．（2023·湖北襄阳·统考中考真题）—Shall we go to the nature park this weekend?—Good idea. We can ________ fresh air in the park.A．take up B．take down C．take in D．take off24．—The panda Yaya has returned to China from the USA．—I hope she can get ________ care than ever before.A．more terrible B．more boring C．more careful D．more famous25．（2023·湖北孝感·统考中考真题）—Can you give me some ________ on learning English well?―Sure. Watching English programs is a good way.A．news B．advice C．decisions D．messages26．—Daniel, try this strawberry cake.—It ________ delicious. I’d like to have some more.A．smells B．feels C．tastes D．looks27．—Safety is very important to all of us.—I agree. We students should learn ________ ourselves in the daily life.A．where to hold B．what to visit C．how to protect D．why to help28．—Look at the sign. What does it mean?—It means we should ________ the rubbish ________ the proper rubbish bins.A．put; into B．throw; around C．mix; into D．try; on29．—Could you tell us _______ we can start a conversation with a foreigner?—Talking about weather is a common way.A．when B．why C．where D．how30．（2023·湖北荆州·统考中考真题）—You _______ take the subway to the airport, for I can drive you there directly. —That’s very kind of you.A．can’t B．needn’t C．mustn’t D．shouldn’t一、完形填空。

高二生物寒假作业（五）一、选择题1.右图表示低倍显微镜观察到的人血涂片的一个视野，下列说法正确的是A．圆饼形的细胞Ⅰ必须经过染色才能观察到B．圆饼形的细胞Ⅰ细胞呼吸能产生大量的CO2和H2OC．人体中细胞Ⅱ可能因为形状改变而导致贫血症的发生D．为放大细胞Ⅱ观察形态结构需先将涂片向右下方移动2.菠菜根的分生区细胞不断分裂使根向远处生长，在分裂过程中不会出现A．细胞分裂间期，中心体的两个中心粒各自产生一个新的中心粒B．细胞分裂中期，染色体形态较固定．数目较清晰C．细胞分裂前期，核膜和核仁逐渐消失D．细胞分裂末期，高尔基体参与细胞壁的形成3.将全部DNA分子双链经32P标记的雄性动物细胞(染色体数为2N)置于不含32P的培养基中培养。

经过连续两次细胞分裂后产生4个子细胞，检测子细胞中的情况。

下列推断正确的是( )A．若进行有丝分裂，则含32P染色体的子细胞比例一定为1/2B．若进行减数分裂，则含32P染色体的子细胞比例一定为1C．若子细胞中的染色体都含32P，则一定进行有丝分裂D．若子细胞中的染色体不都含32P，则一定进行减数分裂4.如图所示细胞分裂过程中一条染色体上DNA含量的变化情况，下列不正确的是（）A．a→b可表示DNA分子复制 B．b→c可表示有丝分裂前期和中期C．c→d可表示染色体的着丝点分裂 D．d→e可表示有丝分裂间期过程5.下图①～⑥表示不同化学元素所组成的化合物，以下说法不正确的是( )A．若②是细胞膜的脂质成分，则不具有物种的特异性B．若图中⑤为过氧化氢酶，则①经脱水缩合形成⑤的过程发生核糖体C．若②为多聚体，且能贮存生物的遗传信息，则②一定是DNAD. 若④主要在人体肝脏和肌肉内合成，则④最可能是糖原6.下列发生了细胞分化且能体现体细胞全能性的生物学过程是（）A．玉米种子萌发长成新植株B．小鼠骨髓造血干细胞形成各种血细胞C．小麦花粉经离体培养发育成单倍体植株D．胡萝卜根韧皮部细胞经组织培养发育成新植株7.下列关于细胞结构和生物体内化合物的叙述正确的是 ( )A．抗体、激素、神经递质、酶发挥一次作用后都将失去生物活性B．ATP脱去两个磷酸基团后成为RNA的基本组成单位之一C．蓝藻和绿藻都能进行光合作用，故二者含有的光合色素相同D．细菌代谢速率极快，细胞膜和细胞器膜为酶提供了附着位置8.下列有关组成生命物质的叙述正确的是A．正是由于生物大分子中以碳元素的含量为最高，所以“没有碳就没有生命”B．分解糖原比分解等量脂肪，释放的能量更多C．DNA是所有生物的遗传物质，说明生物具有统一性D．构成细胞膜的化学成分除蛋白质、磷脂外还有多糖、胆固醇等9.某兴趣小组在室温下进行了酵母菌无氧呼吸的探究实验（如图）．下列分析错误的是（）A．滴管中冒出的气泡是反应产生CO2的结果B．试管中加水的主要目的是制造无氧环境C．若试管中的水换成冷水，气泡释放速率下降D．被分解的葡萄糖中的能量一部分转移至ATP，其余的存留在酒精中10.下列关于光合作用和呼吸作用的叙述，正确的是A．光合作用产生的ATP与呼吸作用产生的ATP的量相等B．在绿色植物叶肉细胞中光合作用和呼吸作用总是同时进行C．高等植物的叶肉细胞内能产生[H]的部位是叶绿体囊状结构、细胞质基质及线粒体D．绿色植物所有活细胞均能进行呼吸作用和光合作用11.如图l是细胞中3种化合物含量的扇形图，图2是有活性的细胞中元素含量的柱形图，下列说法不正确的是A．若图1表示正常细胞，则A、B化合物共有的元素中含量最多的是aB．若图1表示细胞完全脱水后化合物含量的扇形图，则A化合物中含量最多的元素为图2中的bC．若图1表示正常细胞，则B化合物具有多样性，其必含的元素为C、H、O、ND．图2中含量最多的元素是a，数量最多的也是a12.下列有关细胞生命历程的叙述中，正确的一项是（）14.图1为细胞膜结构及物质跨膜运输过程图，图2为某物质运输速率与耗氧量的关系，下列说法错误的是（）15.南实生物兴趣小组利用如图装置(若干个)开展了有关光合作用和细胞呼吸的实验研究，实验开始时打开活塞开关，使水柱液面平齐，然后关闭活塞开关，8小时后，观察记录实验数据如下表。

高三英语寒假作业（九）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．AA newly-published study has shown that loneliness can spread from one person to another, like a disease. Researchers used information from the Framingham Study, which began in 1948. The Framingham Study gathers information about physical and mental health, personal behavior and diet. At first, the study involved about 5,000 people in the American state of Massachusetts. Now, more than 12,000 individuals are taking part.Information from the Framingham Study showed earlier that happiness can spread from person to person. So can behaviors like littering and the ability to stop smoking.University of Chicago psychologist John Cacioppo led the recent study. He and other researchers attempted to show how often people felt lonely. They found that the feeling of loneliness spread through social groups.Having a social connection with a lonely person increased the chances that another individual would feel lonely. In fact, a friend of a lonely person was 52% more likely to develop feelings of loneliness. A friend of that person was 25% more likely. The researchers say this shows that a person could indir ectly be affected by someone’s loneliness.The effect was strongest among friends. Neighbors were the second most affected group. The effect was weaker on husbands and wives, and brothers and sisters. The researchers also found that loneliness spread more easily among women than men.The New York Times newspaper reports that, on average, people experience feelings of loneliness about 48 days a year. It also found that every additional friend can decrease loneliness by about five percent, or two and a half fewer lonely days.Loneliness has been linked to health problems like depression and sleeping difficulties. The researchers believe that knowing the causes of loneliness could help in reducing it.The study suggests that people can take steps to stop the spread of loneliness. They can do this by helping individuals they know who may be experiencing loneliness. The result can be helpful to the whole social group.1. What is TRUE about the Framingham Study?A. It was only conducted in 1948.B. It involves more than 12,000 participants.C. It was led by John Cacioppo.D. It showed that any behavior could spread.2. Which statement about the spread of loneliness is true?A. The spreading effect was the second strongest among friends.B. No spreading effect was found on husbands and wives.C. Women are more likely to be affected than men.D. Brothers are more easily affected than neighbors.3. What is the main idea of the passage?A. Actions should be taken to help lonely people.B. People feel lonely for many reasons.C. Ways to fight against loneliness.D. Lonely people can affect others.BEveryone would like to be a millionaire , a person with a lot of money, but can you imagine having over $30 million and only being 20 years old? Britney Spears from Kentwood, a small town in Louisiana, is only 20 years old. She is a world famous film star with not only $30 million but also a $2 million house in LA. At her young age, she can look after her family financially (经济上) all her life. This year is a big year for Britney. She is now on a 31-day tour of the US and every concert is a sell-out. That means she plays in front of a crowd of around 18,000 people every time. It’s a tiring schedule but brings her a lot. When touring, she goes to bed around 1 a.m. and then has a lie-in until 1 p.m. the next day. Her philosophy (人生观) is to take care of the body and relax but always make sure you work hard and have fun.Spears is not pleased with only touring and selling nearly 40 million records so she decided to step into the movie business and try a bit of acting. She made an appearance in “Austin Power 3”this year and she is filming a teenage light play that will come out in March 2003. In this movie, she has a starring role.For Britney, acting is another way to express herself and she is enthusiastic (热心的) about it all. If her movies are successful, her money in the bank is sure to grow by another few million dollars but she does it for the love, not the money, as she herselftells the reporters .1. We can infer (推断) from the text that most millionaires are __________.A. older than 20B. around 20C. in their 30sD. in their 40s2. The underlined word “you”in the first paragraph refers to __________.A. a person in generalB. a special personC. Britney SpearsD. a person interested in money3. Which of the following is not true according to the text?A. Though young, Britney can support her family now.B. While touring, Britney sleeps about 12 hours a day.C. The teenage comedy movie was based on Britney’s own story.D. Britney will be even richer with her movies successful.4. According to Britney Spears, she works __________.A. to be a great actressB. for the enjoymentC. for moneyD. to be more famousCBecause I am extremely vulnerable to both slick advertising and peer pressure, I’ve been thinking about getting an iPad. But here’s the problem: I’m cheap, and the iPad’s not. If I’m going to fork over at least $499 for a new device, I want to try it out and make sure it’s not just a larger, shinier version of my iPhone. But if I went to my local Apple Store, I’d get to spend only a few minutes testin g out the machine. I wanted more time than that, so I rented one for $15 a day from a guy on SnapGoods.The Internet start-up in Brooklyn runs on simple reasoning: there are people who want to borrow stuff –camping equipment, food processors, robot vacuums, etc. –and there are people who have stuff they want to lend. SnapGoods helps these two groups connect over the Web. SnapGoods is one of many sites that have sprung up to facilitate offline sharing. Some sites have a narrow, obvious focus (like ) while others are more obscure (Neighborhood Fruit helpspeople share what’s growing in their yards or find fruit trees on public land). But regardless of whether the sharing is free or involves a fee, these transactions often come with a stick-it-to-the-man attitude. ―Borrow these things from your neighbors,‖ reads one earnest request on , ―The owner-ship has SAILED!‖All of these sites are encouraging something academics call collaborative consumption – in other words, peer-to-peer sharing or renting. Renting something you don’t need to use very often makes a lot more sense than buying it and letting it collect dust in your garage. There’s a green aspect as well, since sharing helps cut down on overall use of resources. But one of collaborative consumption’s most surprising benefits turns out to be social. In an era when families are scattered around the country and we may not know the people down the street from us, sharing things –even with strangers we’ve just met online –allows us to make meaningful connections.―This isn’t just about saving the environment or saving a dollar,‖ says SnapGoods CEO Ron Williams, who came up with the idea after renting a stranger’s motorcycle via Craigslist. ―This is about saving yourself by makin g informed consumer decisions.‖I’m not sure if I got a thrill when I borrowed Goodwin’s iPad, but it did feel good to make a connection. In the end, though, I decided not to purchase an iPad. Sorry, Steve Jobs. I’m just not that into owning things anymore.1. Which of the following is NOT a reason for the author’s renting an iPad instead of buying one?A. The iPad is expensive and the author wants to make sure an iPad is worthy.B. He has already got an iPhone and expects to test the better quality of iPad.C. The local Apple Store only offters limited time to test out the machine.D. The iPad is so expensive that he cannot afford it.2. SnapGoods is a website which________.A. facilitates online sharingB. helps people borrow things from their neighborsC. connects borrowers and lenders for stuff sharingD. sells iPad online3. What is Ron Williams’ attitude towards collaborative consumption?A. FavorableB. CriticalC. IndifferentD. Not known4. Which of the following can best serve as the title of the passage?A. SnapGoods: a Good Place For ShoppingB. Borrow, Don’t Buy: Websites That Let Strangers ShareC. Why Do I RentD. Tips For Selling Things On the InternetDHigh school dropouts earn an average of $9,000 less per year than graduates. Now a new study denies a common belief why they quit. It’s much more basic than flunking out(不及格).Society tends to think of high school dropouts as kids who just can’t make it. They are lazy, and perhaps not too bright. So researchers were surprised when they asked more than 450 kids who quit school about why they left.―The vast majority actually had passing grades and they were confident that they could have graduated from high school.‖John Bridgeland, the executive researcher said. About 1 million teens leave school each year. Only about half of African-American and Hispanic(美籍西班牙的)students will receive a diploma, and actually all dropouts come to regret their decision. So, if failing grades don’t explain why these kids quit, what does? Again, John Bridgeland: ―The most dependable finding was that they were bored.‖―They found classes uninteresting；they weren’t inspired or motivated. They didn’t see any direct connection between what they were learning in the classroom to their own lives, or to their career aspirations.‖The study found that most teens who do drop out wait until they turn sixteen, which happens to be the age at which most states allow students to quit. In the US, only one state, New Mexico, has a law requiring teenagers to stay in high school until they graduate. Only four states: California, Tennessee, Texas and Utah, plus theDistrict of Columbia, require school attendance until age 18, no exceptions. Jeffrey Garin, another researcher, says raising the compulsory attendance age may be one way to keep more kids in school.―As these dropouts look back, they realize they’ve made a mistake. And anything that sort of gives these people an extra push to stick it out and see it through to the end, is probably help ful measure.‖New Hampshire may be the next state to raise its school attendance age to 18.But critics say that forcing the students unwilling to continue their studies to stay in school misses the point—the need for reform. It’s been called for to reinven t high school education to make it more challenging and relevant, and to ensure that kids who do stick it out receive a diploma that actually means something.【小题1】Most high school students drop out of school because_______.A.they have failing gradesB.B. they take no interest in classesC. they are mistreatedD. they are lazy and not intelligent【小题2】According to the passage, which state has a law requiring school attendance until they graduate?A.New HampshireB. UtahC. New MexicoD. The District of Columbia【小题3】The underlined words ―stick it out‖probably means―________‖.A. complete schoolingB. solve the problemC. love having classesD. believe in themselves【小题4】In the last paragraph, the writer is trying to________.A. analyze the reason why students quit schoolB. suggest raising the compulsory attendance ageC. raise awareness of reforming high school educationD. wish to make laws to guarantee no dropout第二节（共5小题：每小题2分，满分10分）【题文】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。

2021秋小学三年级数学寒假作业（练习九）一、读一读，写一写。

二、在○里填上“＞”、“＜”或“＝”。

8分80秒4时240分160秒3分3时300分5分150秒7分42021三、细心算一算。

55分70分=（）分7分40秒=（）秒1时40分=（）分80分40分=（）时34分– 15 分=（）分35秒85秒=（）分四、填空。

1、（）、（）、（）是我们常用的时间单位，计量很短的时间，常用比分更小的单位（）。

2、有些钟表上有3根针，走得最快的是（）针，走得最慢的是（）针，剩下的一根针就是（）。

3、时针走1格是（）小时，走6格是（）小时。

4、分针走1小格是（）分钟，走1大格是（）分钟，走一圈是（）分钟也是（）小时。

5、秒针走1小格是（）秒钟，走1大格是（）秒钟，走一圈是（）少也是（）分。

6、妈妈每天早上7：30到公司上班，她从家到公司要走15分钟，她最晚（）出门才能保证按时上班。

五、解决问题。

、1、星期三天，小路和爸爸、妈妈到游乐场去玩。

小路：这是我们出发的时间。

爸爸：开车要用1小时10分他们在什么时候可以到才能到达。

达游乐场？2、小俊做了一个实验：他一只小蚂蚁放进一个9 厘米深的小土坑里进行观察。

他看到小蚂蚁沿着土坑的边沿往上爬。

蚂蚁：我每爬3厘米要花3分钟，照这样计算，小蚂蚁从坑底小俊并且还要休息1分钟。

爬到坑口要多长时间？附参考答案一、读一读，写一写。

12时30分，9时50分，2时8分，7时50分，4时42分，5时35分二、比大小。

＞，＝，＜，＜，＞，＝；三、算一算。

125分，460秒，100分，2时，19分，2分四、填空。

1、时、分、秒，秒，2、秒针，时针，分针，3、1时，6时；4、1分，5分，60分，1小时，5、1秒，5秒，60秒，1分，6、7：15五、解决问题。

1、9:501:10=11：00 答：他们在11：00可以到达游乐场。

2：9÷3=3（次）3×31×2=11（分）答：蚂蚁从坑底爬到坑口要11分钟。

高三历史寒假作业（九）一、选择题，每小题的四个选项中，只有一项符合题意。

1.“君王自命‘天子’，君王驾崩，君统不辍，由其嫡长子自然承袭，如是者不绝。

父家长在家庭内是一把手，君王是国家的一把手，且各级地方政权的首脑亦被视为百姓的‘父母官’。

”这段材料所表达的主旨是A．君权神授，皇位世袭B．君父同伦，家国同构C．强干弱枝，中央集权D．男尊女卑，君父一体2.右图是1907年发表的漫画(注：图中所示器具从右到左依次是坛、提勺、漏斗、壶)。

其政治寓意是A．清政府成为列强统治中国的工具 B．近代社会阶级结构发生新变化C．民族工业受到中外反动势力压制 D．近代中国呈现国富民穷的格局3.“学生、平民和城市精英从中国沿海地区向内地的被迫撤退，造成促进‘心理统一’的强大压力，并加强了过去联系微弱的中国社会各阶层之间的认同感”。

（《中国的近代化》）这种“心理统一”和“认同感”促成了A．国民革命的兴起 B．土地革命的开展C．抗日战争的胜利 D．战略反攻的开始4.下图是中华人民共和国某时期政权组织结构示意图。

中央人民政府委员会①接受中国人民政治协商会议全体会议的领导②具有新民主主义政权性质③依据《共同纲领》履行职权④领导完成了社会主义改造A．①②③ B．①②④ C．②③④ D．①③④5.“中国政治现代化的第一个巨大跃进是从铲除专制政治到奠基现代民主政治……第二个巨大跃进是从社会主义民主政治框架的基本确立，到进入社会主义法治政治的基本轨道。

”其中，“铲除专制政治”“社会主义民主政治框架的基本确立”和“进入社会主义法治政治的基本轨道”分别是指A．辛亥革命、新中国成立和改革开放B．辛亥革命、《中华人民共和国宪法》的制定和“依法治国”被写入宪法C．国民大革命、《共同纲领》和“依法治国”被中共十五大确立为政治体制改革的重点D．新民主主义革命的胜利、《中华人民共和国宪法》的制定和中共十一届三中全会的召开6.真正的法律是与自然相一致的正确理性；它适用于所有人“真正的法律是与自然相一致的正确理性；它适用于所有人且不变而永恒，……它是唯一而一同的法，永恒而不可改变，约束所有时代的所有民族。

DAB CEF 公立部初三数学寒假作业九一、选择题1、某市按以下标准收取水费:用水不超过20吨,按每吨1.2元收费,超过20吨则超过部分按每吨1.5元收费.某家庭五月份的水费是平均每吨1.25元,那么这个家庭五月份应交水费( )A、20元.B、24元.C、30元.D、36元.2．如图，矩形纸片ABCD，M为AD边的中点，将纸片沿BM、CM折叠，使A点落在A1处，D点落在D1处，若∠1=40°，则∠BMC=（）.（A）135° （B）120°（C）100°（D）110°3．如图，等腰梯形ABCD中，AD∥BC，以A为圆心，AD为半径的圆与BC切于点M，与AB交于点E，若AD＝2，BC＝6，则⌒DE的长为（）A．23πB．43πC．83πD．π34．如图，在Rt△ABC中，OA＝2，AB＝1，把Rt△ABO绕着原点逆时针旋转90°，得△A＇B＇O，那么点A＇的坐标为( )A、(3，1)B、(1，3)C、(1-，3) D、(3，1-)5. 如图，抛物线y=ax2＋bx＋c的开口向下，交x轴的正半轴于（1，0），则下列结论：（1）-abc＜0；（2）a－b＋c＜0；（3）2a＋b＜0；（4）a＋c＜0 ，正确的个数有（）A.1个B.2个C.3个D.4个6．如图，AB为⊙O的直径，CA切⊙O于A，CB交⊙O于D，若CD=2，BD=6，则sinB=【】（A）12（B）13（C）2（D）37.现有A、B两枚均匀的小立方体（立方体的每个面上分别标有数字1,2,3,4,5,6）。

小明掷A，立方体朝上的数字为x、小强掷B，立方体朝上的数字为y来确定点(,)P x y，那么它们各掷一次所确定的点P落在以点(3,0)M为圆心，半径为3的半圆内（如图所示）的概率为（）A.12B.518C.718D.7128．在平面直角坐标系中，已知点A（4-，0），B（2，0），若点C在一次函数221+-=xy的图象上，且△ABC为直角三角形，则满足条件的点C有（）A．1个B．2个C．3个D．4个9．为筹备班级的初中毕业联欢会，班长对全班同学爱吃哪几种水果作民意调查，从而最终决定买什么水果；下列调查数据中最值得关注的是（）A．平均数 B．中位数 C．众数 D．方差10．小亮早晨从家骑车到学校，先上坡后下坡，行程情况如图所示，若返回时上坡、下坡的速度仍保持不变，那么小明从学校骑车回家用的时间是（）A．37.2分钟 B．48分钟 C．30分钟 D．33分钟11．若不等式组⎩⎨⎧>-<+mxxx148的解集是x>3，则m的取值范围是（）A．m>3 B．m≥3 C．m≤3 D．m<312.如图，直角梯形ABCD中，∠ADC＝90°，AB＝6，AD＝2，BC＝4，你可以在CD边上找到多少个点，使其与点A、B构成一个直角三角形（）Ａ．1个Ｂ．2个Ｃ．3个Ｄ．无数多个二、填空题13．用等腰直角三角形板画45AOB∠=︒，并将三角板沿OB方向平移到如图的虚线处后绕点M逆时针方向旋转22︒，则三角板的斜边与射线OA的夹角α的度数为 .14. 因式分解：=+-xxx4423．15．若()240x-=，则x y+的值为 ___．16、如图,有一张面积为1的正方形纸片ABCD,M、N分别是AD,BC边的中点,将C点折叠至MN上,落在P点的位置,折痕为BQ,连结PQ,则PQ=______.三、解答题17.10145()(3.14)22π-︒+----.18.化简：222931693a a aa a a a--÷++++.19．如图，在矩形ABCD中，E是BC边上的点，AE＝BC，DF⊥AE，垂足为F，连接DE．(1)求证：△ABE≌△DF A；(2)如果AD＝10，AB＝6，求sin∠EDF的值．AMDEBCy/分钟20、在今年“五一”长假期间，某学校团委会要求学生参加一项社会调查活动．八年级学生小青想了解她所居住的小区500户居民的家庭收入情况，从中随机调查了40户居民家庭的收入情况（收入取整数，单位：元）并绘制了如下的频数分布表和频数分布直方图．根据以上提供的信息，解答下列问题：（1） 在频数分布表中，a 的值为 ，b 的值为 ；c 的值为 ； （2） 补全频数分布直方图；（3） 这40户家庭收入的中位数落在哪一个小组？（4） 请你估计该居民小区家庭收入较低（不足1000元）的户数大约有多少户？21．某学校组织340名师生进行长途考察活动，带有行李170件，计划租用甲、乙两种型号的汽车10辆。