限时训练9答案
高考语文-限时组合快练 快练9 Word版含解析.doc
快练9语言基础知识＋名篇名句默写＋文言文阅读(1)一、语言基础知识1．下列词语中，加点字的注音全都正确的一项是()A．朔．望(shuò)悲怆．(chuànɡ)脖颈．子(ɡěnɡ) 名不副．实(fú)B．慰藉．(jí) 狭隘．(ài)兑换券．(juàn) 引吭．高歌(hánɡ)C．嬗．变(shàn) 管窥．(kuī)紧箍．咒(ɡū) 厚今薄．古(báo)D．行．情(hánɡ) 沮．丧(jǔ)撒手锏．(jiǎn) 追本溯．源(sù)答案 D解析A项“副”读fù。
B项“藉”读jiè，“券”读quàn 。
C项“薄”读bó。
2．下列各句中，标点符号使用正确的一项是()A．著名国学大师南怀瑾先生认为，人生的最高境界是“佛为心，道为骨，儒为表，大度看世界；技在手，能在身，思在脑，从容过生活。
”B．黄庭坚，字鲁直，号山谷道人，洪州分宁人(今江西修水)。
他以讲议著称，与秦观、张耒、晁补之合称“苏门四学士”。
C．座谈会上有人问他对目前相声表演中出现的新形式，如男女对口相声、电吉他相声、群口相声有什么看法？D．在乡村住得久了，周围的鸡呀，鸭呀，牛呀，羊呀，还有山水、草木都给你亲近感。
答案 D解析A项句号应在引号外。
B项括号应在“分宁”之后。
C项全句是陈述句，句末应用句号。
3．下列各句中，加点的词语运用正确的一项是()A．清华大学一学生说：“我每天坚持7点进自习室，从来没在任意．．一节课堂上睡过觉，总是坐在第一排专心听讲。
”B．真金不怕火炼．．．．．．，只要是金子总会发光，有才华的人不会总被埋没，总有一天会被发现，被发掘出来。
C．超级飓风“桑迪”裹挟着狂风骤雨重创了美国东海岸，飓风所过之处，房屋桥梁几乎毁坏殆尽．．，一片狼藉。
D．这套新出版的“走向诺贝尔”文学丛书囊括了当代可能获得诺贝尔文学奖的中国作家的作品，真可谓洋洋大观．．．．。
9限时练九.pptx
限时练九
限时：25 分钟
答案链接 P116
14．能源是社会发展的基础，发展核能是解决能源问题的途径之一．下列释放核能的反
应方程，表述正确的有( )
A．13H＋12H→24He＋01n 是人工转变
B．13H＋1
H2 →2
H4 e＋0
1
n
是
β
衰
变
C.
92235U＋01n→
56144Ba＋368K9 r＋30
1
n
是核裂变反应
D.
92235U＋01n→ 54140Xe＋389S4 r＋20
1
n
是
α
衰变
15．(2019 广东东莞中学模拟)当前我国“高铁”事业发展迅猛，假设一辆高速列车在机
车牵引力和恒定阻力作用下，在水平轨道上由静止开始启动，其 v•t 图像如图所示，已知 0～ t1 时间内为过原点的倾斜直线，t1 时刻达到额定功率 P，此后保持功率 P 不变，在 t3 时刻达 到最大速度 v3，以后匀速运动．下列判断正确的是( )
21．AD 【解析】导线框 ABCD 在磁场中转动，产生正弦交流电，感应电动势的最大 值为 Em＝nBSω＝448 2 V，由于导线框(电源)内阻不计，则电源的输出电压(也是变压器的
输入电压)的有效值为 U1＝Em2＝448 V，即为电压表的读数，选项 A 正确；升压变压器的匝
数比是
n1∶n2＝2∶5，则输电线的输送电压为
U2＝nn21U1＝1
120
V;
灯泡中电流
I4＝PU4 4＝
1 100 220
学无止 境
n4 A＝5 A, 设降压变压器的匝数比为 n3∶n4，则降压变压器中的输入电流 I3＝ n3I4；输电线上
高考英语二轮复习 专题9 情态动词与虚拟语气限时训练
专题限时训练(九) [情态动词与虚拟语气]( )1. —How much shall I pay for the phone call?—You________. This is free of charge.A．shouldn’t B．can’t C．don’t have to D．mustn’t( )2. —May I leave the office before 5 o’clock in the afternoon?—No，I’m afraid you ________.A．needn’t B. wouldn’t C．mustn’t D．won’t( )3. The outbreak of SARS tells us that a sound public health system ________ be built up and strengthened in our country.A．should B．can C．will D．may( )4. —Shall I tell John about it?—No，you ________. I don’t know his telephone number.A．needn’t B. wouldn’t C．mustn’t D．shouldn’t( )5. Often when I passed the village，I________ them working on the farm.A．will see B．would see C．must have seen D．must see( )6. Mr Bush is on time for everything. How ________ it be that he was late for the opening ceremony?A．can B．should C．may D．must( )7. My parents never remember my phone number，and they always________ look it up every time they call me.A．can B．must C．should D．have to( )8. The traffic light is red，so I ________ stop my car.A．must B．have to C．can D．mustn’t( )9. —Will you stay for another hour?—Sorry，I________. One of my best friends is coming to see me.A．mustn’t B．can’t C．needn’t D．won’t( )10. —What happened to the young trees we planted?—the trees ________well，but I didn’t water them.A．might grow B．needn’t have grownC．would grow D．would have grown( )11. You can’t imagine such a shy girl ________ be so brave to say that.A．might B．need C．should D．would( )12. —Write to me when you get home.—________.A．I must B．I should C．I will D．I can( )13. He was taken away by the police. He ________ for a robber.A．must be mistaken B．must have been mistakenC．must mistake D．must have mistaken( )14. —________I visit Lucy on Sunday，Mum?—Yes，you________.A．Must; can B．May; mayC．Need; need D．May; need( )15. Mary got up early，but she ________ so，because she had no work to do that morning.A．can not have done B．must not have doneC．shouldn’t have done D．needn’t have done( )16. —Don’t forget to bring my new books tomorrow afternoon.—No，I ________.A．don’t B．can’t C．won’t D．couldn’t( )17. When a friend of mine gave me a ticket for the game，I________ go.A．couldn’t help B．can’t butC．couldn’t help but D．just have to( )18. —I hear you’ve got a set of Australian coins. ________ I have a look?—Yes，certainly.A．Do B．May C．Will D．Should( )19. There is nothing to do，so I ________ as well go to bed.A．may B．should C．can D．would( )20. He seldom listens to others. He ________ answer for what he has done.A．shall B．will C．can D．would1. C shouldn’t意为“不应该”；can’t意为“不能”；don’t have to意为“不必”；mustn’t意为“禁止”。
2021高考江苏版语文一轮复习： 专项限时练9 图文转换
专项限时练(九) 图文转换(建议用时：30分钟)一、选择题1．以下图是2003－2021年间的国内汽油与国际原油价格表，粗线代表国内油价变化情况，细线代表国际油价变化情况。
以下对该表分析不正确的一项为哪一项()A．从价格的总体水平来看，国内油价要高于国际油价。
B．从价格的变化幅度来看，国内油价变化幅度要小于国际油价变化幅度。
C．从价格的同步性来看，国内油价与国际油价的涨跌根本同步。
D．从价格的变化轨迹来看，国内油价与国际油价的差距在持续拉大。
D[此题考察语言表达准确的能力。
解答图表题关键在于看懂图示的含意，并和选项对照，吻合度高的就是正确的，吻合度较低甚至明显抵牾的就是不当的。
从图表中可以看出，两条曲线有些局部重合或接近，即国内油价与国际油价有时一样或相近，因此D项说“差距在持续拉大〞明显错误。
]2．对下面两张问卷调查统计表的理解，有误的一项为哪一项()(1)您希望开设礼仪教育的课程吗？对象学生市民选项①非常希望19.08% 11.90%②希望68.79% 59.52%③不希望 5.20% 5.96%④无所谓 6.93% 22.62%(2)您认为礼仪教育的承当者应该是？对象学生市民选项①家庭20.23% 22.62%②学校9.83% 7.92%③社会 4.62% 11.13%④以上都是65.32% 58.33%，在是否希望开设礼仪教育课程这个问题上，学生与市民中的大多数人都希望开设礼仪教育课程。
B．在礼仪教育的承当者的问题上，调查显示学生与市民中的多数人认为礼仪教育应由家庭、学校和社会共同承当。
C．学生与市民都认为家庭、学校、社会三者之间，家庭是最重要的礼仪教育的承当者，然后依次为社会和学校。
D．调查结果说明，学生与市民对礼仪教育的认识虽有诸多一样之处，但差异也明显，对礼仪教育的需求，学生意愿更强烈。
C[此题考察语言表达准确的能力。
C项，“依次为社会和学校〞错，据图表所显示的数字可知，市民与学生的意见不一致。
高三物理限时训练(9、15)
高三物理限时训练（9、15）一、选择题：1.已知引力常量G 和下列各组数据，能计算出地球质量的是 ( )A ．地球公转的周期及地球离太阳的距离B ．人造地球卫星在地表运行的周期和轨道半径C ．月球绕地球运行的周期及月球的半径D ．若不考虑地球自转，知地球的半径及地球表面的g2.．假如一颗做匀速圆周运动的人造地球卫星的轨道半径增大为原来的2倍，仍做匀速圆周运动，则( )A ．v=ωr ，可知卫星的运行线速度将增大到原来的2倍B ．根据公式2mv F r =，可知卫星所需的向心力将减小到原来的1/2C ．根据公式2MmF G r=，可知地球提供的向心力将减小到原来的1/4D ．以上说法都是错误的3.“嫦娥一号”探月卫星沿地月转移轨道到达月球，在距月球表面200km 的P 点进行第一次“刹车制动”后被月球捕获，进入椭圆轨道Ⅰ绕月飞行，如右图所示。
之后，卫星在P 点经过几次“刹车制动”，最终在距月球表面200km 的圆形轨道Ⅲ上绕月球做匀速圆周运动。
用T 1、T 2、T 3分别表示卫星在椭圆轨道Ⅰ、Ⅱ和圆形轨道Ⅲ上运动的周期，用a 1、a 2、a 3分别表示卫星沿三个轨道运动到P 点的加速度，v 1、v 2、v 3分别表示卫星沿三个轨道运动到P 点的速度，用F 1、F 2、F 3分别表示卫星沿三个轨道运动到P 点时受到的万有引力，则下面关系式中正确的是（ ） A ．a 1＜a 2＜a 3 B ．v 1＜v 2＜v 3 C ．T 1＞T 2＞T 3 D ．F 1＝F 2＝F 34.已知地球半径为R ，地面处的重力加速度为g ，一颗距离地面高度为2R 的人造地球卫星绕地球做匀速圆周运动，下列说法正确的是（ ） A ．卫星的加速度大小为g41 B ．卫星的角速度为Rg 27C ．卫星的线速度大小为27gRD ．卫星的周期为gRπ65.A 、B 是两颗不同的行星，各有一颗在其表面附近运行的卫星．若两颗卫星分别绕A 、B 做匀速圆周运动的周期相等．由此可判断 ( )A ．两颗卫星分别绕A 、B 做匀速圆周运动的轨道半径一定相等 B ．两颗卫星分别绕A 、B 做匀速圆周运动的线速度一定相等C ．行星A 、B 的质量一定相等D ．行星A 、B 的平均密度一定相等6.某人造地球卫星因受高空稀薄空气的阻力作用，绕地球运转的轨道会慢慢改变，每次测量中卫星的运动可近似看作圆周运动。
高二英语45分钟限时训练9
高二英语45分钟限时训练9AFour books that will change your lifeThirteen Things Mentally Strong People Don’t Do—Amy MorinDo you struggle to get over your failures or pay much attention to things that are out of your control? Getting over these troubles can have an important influence on your daily life. Morin shares her most successful ways to overcome these difficulties.How Will You Measure Your Life? —Christensen, James Allworth and Karen DillonWhat do you think would make you happier at work? Perhaps high pay might be nice, or maybe some more admiration from fellow colleagues. Are you keeping a good balance in life? While career achievements can be satisfying, ignoring your family and friends can be harmful in the long run.Finding Your Element —Ken RobinsonHave you ever felt pressured to live your life in a certain way? Society often encourages you to graduate from high school at 18, enter university, and then become a professional person, get married and have children. This may work for some people, but for many people it can be limited. Everyone has a passion. Find out how you can break society’s strict rules and find your position in life.Emotional Intelligence—Daniel GolemanDo our feelings hold us back? Would we do better if we became unfeeling creatures? You probably let feelings cloud your judgment more often than you know. Goleman explains how you can avoid letting your feelings rule you and make better decisions in life.21.What kind of readers is the first book is intended for?A. The ones who want to be popular among colleagues.B. The one who want to control their feelings.C. The one who are experiencing failures.D. The one who want to get high pay.22．Which book suggests keeping a balance between work and life?A. Thirteen Things Mentally Strong People Don’t Do.B. How Will You Measure Your Life?.C. Finding Your Element.D. Emotional Intelligence.23．What do we know about Emotional Intelligence?A. It helps us make wise decisions.B. It shows us the importance of emotions.C. It teaches us the way to live a different life.D. It tells us how to break society’s strict rules.BThe search engine Google celebrated on Thursday the 110th birthday of the first Native American woman engineer. Google honored Mary Ross with a special Google Doodle on its homepage.Ross was born on August 9th, 1908, in the state of Oklahoma. She was the great-granddaughter of John Ross，the longest—serving chief of the Cherokee Nation. Her work is considered important to the early stages of the age of space travel.Ross showed special abilities in math and science from an early age. As a student, she developed an interest in aviation, or the practice of flying aircraft. She went on to earn a master’s degree in mathematics from Colorado State Teachers College, now called the University of Northern Colorado.During World War II, Ross began working for the Lockheed Aircraft Corporation as a mathematician. She earned a special certification in the field from the University of California in1949.Ross was later chosen to join Lockheed’s top—secret Skunk Works team that worked on aircraft designs. The name refers to a group that is permitted to work independently on advanced projects. She was the only female engineer among the team’s 40 members.Early on, she researched defense systems. By the late 1950s, her work centered on satellites and a series of space rockets called Agenda. The rockets were extremely important in the 1960s during the Apollo moon program.Ross also helped develop early design ideas for space travel between planets，including flyby space flights to study Venus and Mars. Ross retired from Lockheed in 1973.But she continued to give talks at high schools andcolleges to encourage more women and Native Americans to study engineering. She died in 2008，a few months before her 100th birthday.Many celebrated Ross’s life on social media. Twitter user Aaron Perez，for example，wrote:“ Mary Ross was an engineer who pioneered in the field of satellites. I never would have known if it wasn’t for the doodle. Women engineers deserve more recognition.”24.Why did Google celebrate Mary Ross’s 110th birthday?A. She invented a new flying aircraft.B. She had been a great designer ever.C. She contributed a lot to space travel.D. She got a master’s degree in mathematics.25. What did Mary Ross do in the middle of 20th century?A. She worked on Agenda.B. She gave talks at high schools.C. She helped women study engineering.D. She planned the Apollo moon program.26．Which of the following can best describe Mary Ross?A. Caring and cautious.B. Talented and creative.C. Generous and patient.D. Courageous and optimistic.C“No one can promise that life will be fair,” but no matter what happens, follow the example se t by Rehan Staton, and never lose sight of your goal.Staton, a 24-year-old former sanitation (环卫) worker in Maryland, US, recently celebrated his acceptance into Harvard Law School.Staton’s life was relatively normal until a series of setbacks impacted his family life and studies. “Things were pretty good until I was 8 years old. My mom abandoned my dad, my brother and me when she moved back to Sri Lanka,” he said.When he was in seventh grade, a teacher even recommended that he be placed in special education classes. His brother Reggie then brainstormed ways to help boost his grades. An aerospace (航天) engineer also offered to tutor him free of charge. Staton’s grades did improve and he became an honor student.However, he was rejected by every college he had applied for. So to help support himself and his family, Staton began working at a sanitation company. He spent his days transporting trash and cleaning dumpsters (垃圾箱), waking up every morning to get dressed around 4 am.“The sanitation workers were the only people in my life who told me I could be somebody,” Staton said, “They would say, ‘You’re too young to be here. Go to college, and come back if it doesn’t work out’”.The son of the company’s owner helped Staton contact a pr ofessor at Bowie State University, and the university eventually accepted Staton.Things began to look up. Two years later, he transferred to the University of Maryland to continue pursuing his undergraduate degree. But Staton still struggled to pay f or his father’s medical bills. He’d work in the morning and take classes in the afternoon.After graduation, Staton worked at a national consulting firm while applying for law school. He plans to start at Harvard this fall, where he will major in sports law to pursue his dream of becoming a sports agent.“For Rehan, the sky is truly the limit. Whatever he chooses to do in the future, he will definitely achieve,” said a chief operating officer of Staton’s firm.For anyone looking for inspiration during difficult times, Staton recommends to “love yourself enough to get what you want out of life,” he told news outlet ABC. “You can always see the light in any dark situation, and you need to hold on to that light.”27. What does the underlined word “setbacks” in paragraph 3 probably mean?A. blowsB. fightsC. opportunitiesD. achievements28. Why did Rehan Staton work as a sanitation worker?A. To gain some work experience.B. To help lighten his family’s financial burdens.C. To save money for his college education.D. To help the sanitation workers who once helped him.29. What does the underlined sentence in the second-to-last paragraph imply?A. Rehan was an observant sky-lover.B. Rehan has limitations on what major he can choose.C. Rehan has an extreme fear of heights.D. Rehan has endless potential to realize his dream.30. What is the author’s purpose in writing this article?A. To share tips on how to get admitted into Harvard.B. To persuade readers to get support when in need.C. To encourage readers not to bend to hardships in life.D. To show the importance of working with the right people.第二节（共5小题；每小题2分，满分10分）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。
限时训练九
初一语文限时训练（九）天使的礼物刘继荣①黄昏，儿子一如既往地推我去广场散心。
二月的风变得暖起来，但是吹到脸上依然带着股寒意，就如我此刻的心境。
②刚坐上轮椅的时候，医生尚笑呵呵打趣，说我最多只能享用三周。
可是如今漫长的三个月过去了，我依然坐在轮椅上。
广播里正放着《吉祥三宝》，真羡慕那个丰腴健硕的妈妈，想必她到了80岁还能健步如飞吧？不像我，三十几岁就坐在轮椅上了。
③儿子兴致勃勃地问：情人节送什么礼物好？④我漫不经心作答：“那要看对方喜欢什么，如果是心爱的，一句话，一首歌也是好的。
”说完才觉惊骇，他刚上一年级，居然提出这么富有挑战性的问题，不禁想起上学期他曾说与一小女生相爱，我问，怎么爱？他答：“我们下课后一起在草坪里找灵芝草，给妈妈治病。
”现在，灵芝草没找到，居然懂得过情人节了。
⑤忽然间，在淡金的晚霞里，一首英文歌响起来，我不禁感慨：“人长耳朵，就为享受这样美的声音吧！”儿子动容。
⑥回家后，儿子替我按摩，他见过名医生为我做按摩，手法倒是学得有模有样，可力度还远远不够。
窗外传来孩子的笑闹声，我发现了儿子的心不在焉，顿时心生黯然，命他快快去玩。
⑦第二天黄昏，竟然又听到那首歌，是洒水车在唱，一时间，只觉得漫天繁花落了又开，连时光都淹没了。
回过神来，才发现儿子早出去了。
⑧钟点工临走时提醒我，说整个寒假儿子日日在闹市区出没。
那一带网吧颇多，里面未成年人也很多，要我千万管紧孩子，她说她的儿子就是在网吧里毁了的。
我心里百味杂陈，酝酿着如何同儿子谈。
⑨可儿子似乎总是很忙，没等我谈到正题，他就鱼一样溜了。
是的，外面春日融融，谁耐烦整日对着一张蜡黄的面孔呢！⑩每一次，听着楼道里咚咚远去的足音，每一步，都似踩在我心上，想起从前他寸步不离地守候着我，小朋友叫去踢足球、堆雪人一概不理，如今，怯得连边都不肯沾了。
⑴长叹一声，吃药罢，这一粒吃掉的是老公的轿车车灯，那一粒咽下的是儿子模型飞机的翅膀，家人的梦想悉数掉进我胃里。
一时间，我忍不住泪流满面。
高三物理选择题限时训练9
高三物理选择题限时训练（九）14．2006年美国NBA 全明星赛非常精彩，最后东部队以2分的微弱优势取胜，本次比赛的最佳队员为东部队的詹姆斯，假设他在某次投篮过程中对篮球做功为W ，出手高度为h 1，篮筐距地面高度为h 2，球的质量为m ，不计空气阻力，则篮球进筐时的动能为：（ ）A ．W+mgh1-mgh2；B ．mgh2-mgh1-W ；C ．mgh1+mgh2-W ；D ．W+mgh2-mgh1。
15．A 、B 两导体板平行放置，在t ＝0时将电子从A 板附近由静止释放。
则在A 、B 两板间加上下列哪个电压时，有可能使电子到不了B 板 ：（ ）16．地球的周围存在地磁场，能有效地改变射向地球的宇宙射线的方向，使它们不能到达地面，从而保护地球上的生命。
假设有一束带正电的宇宙射线粒子垂直于地面向赤道射来（如图，地球由西向东转，虚线表示地球自转轴，上方为地理北极），不考虑粒子受到的重力作用，则在地磁场的作用下，粒子在进入地球周围的空间时，其偏转方向以及速度大小的变化情况是：（ ）A ．相对于预定地点向东偏转，速度变大；B ．相对于预定地点向西偏转，速度变大；C ．相对于预定地点向东偏转，速度大小不变；D ．相对于预定地点向西偏转，速度大小不变。
17．两个相同的条形磁铁，放在平板AB 上，磁铁的N 、S 极如图所示。
开始时平板及磁铁皆处于水平位置，且静止不动。
当将AB 沿竖直方向向上或向下平移时，关于磁铁的运动下列说法正确的是（ ）A ．将AB 竖直向下平移（磁铁与平板间始终相互接触）时，两个条形磁铁一定碰在一起B ．将AB 竖直向下平移（磁铁与平板间始终相互接触）时，两个条形磁铁可能碰在一起C ．将AB 竖直向上平移（磁铁与平板间始终相互接触）时，两个条形磁铁一定不能碰在一起D ．将AB 竖直向上平移（磁铁与平板间始终相互接触）时，两个条形磁铁可能碰在一起18．示波器是一种多功能电学仪器，可以在荧光屏上显示出被检测的电压波形。
(整理版高中英语)高三英语限时练习九
高三英语限时练习九完形填空〔时间：10分钟〕A seeker asks, “I want to make a difference in the world, but there are so many causes crying for attention that I feel deeply confused. I don't know where to put my energy to have the greatest 21 . Where do I begin?〞Lynn Answers:There is no one “ 22 ” place to begin. Each of us has a different 23 place, and the place where we will be of greatest service has to do with where we most want to 24 . If we want to have an effect on the world around us, it's important to 25 what I think of as our "Area of Power." Our Area of Power is where we feel the most passion to act and have the most 26 that results are 27 .If we pray for world peace, but have no vision of what this would look like and no faith that our 28 will help, our effect is less than if we pray for peace and harmony in our own 29 with a clear picture of what this means and excitement that healing is possible. Without faith that we can 30 , our power to help is decreased.21. A. power B. ease C. effect D. result22. A. right B. real C. similar D. exact23. A. amusing B. ending C. starting D. finishing24. A. give B. live C. act D. dream25. A. work B. regard C. consider D. identify26. A. power B. peace C. faith D. energy27. A. visible B. possible C. reasonable D. accessible28. A. prayers B. players C. seekers D. watchers29. A. language B. way C. world D. family30. A. make an effort B. make itC. make a differenceD. make ends meet语法填空〔时间：10分钟〕The Olympic motto is "faster, higher, stronger." The 31 ( intend) meaning is that one's focus should be on bettering one's achievements, rather than on coming in first.The motto 32 〔be〕 with the Games from the 33 (found) of the International Olympic Committee in 1894. It was proposed by the father of the modern Olympic Games, Pierre de Coubertin, who got34 from a speech given by a friend of his.35 of the five Olympic rings is 36 different color. Together, they represent the five inhabited continents, although no particular ring 37 (mean) to represent 38 specific continent. The rings are interconnected to represent the idea that the Olympics are universal, 39 〔bring 〕 athletes from the entire world together.The Olympic flag places the Olympic rings on a white background . 40 every national flag in the world contains at least one of the flag's six colors (black, blue, green, red, yellow, white), this further symbolizes the universality of the Olympics.阅读理解〔时间：20分钟〕AA little under one-third of U.S. families have no Internet access and do not plan to get it, with most of the holdouts seeing little use for it in their lives, according to a survey released on Friday.Park Associates, a Dallas-based technology market research firm, said 29 percent of U.S. families, or 31 million homes, do not have Internet access and do not intend to subscribe〔预订〕to an Internet service over the next 12 months. The second annual National Technology Scan conducted by Park found that the main reason why potential customers say they do not subscribe to the Internet is because of the low value to their daily lives rather than concerns over cost.Forty-four percent of these families say they are not interested in anything on the Internet, versus just 22 percent who say they cannot afford a computer or the cost of Internet service, the survey showed. The answer “I’m not sure how to use the Internet〞 came from 17 percent of participants who do not subscribe. The response “I do all my e-commerce shopping and YouTube-watching at work〞 was cited by 14 percent of Internet-access users. Three percent said the Internet doesn’t reach their homes.The study found U.S. broadband adoption grew to 52 percent over , up from 42 percent in . Roughly half of new subscribers converted〔转变〕from slower-speed, dial-up Internet access while the other half of families had no prior access.“The industry continues to chip〔击破〕away at the core of non-subscribers, but has a long way to go,〞 said John Barrett, director of research at Parks Associates. “Entertainment applications will be the key. If anything will pull in the holdouts, it’s going to be applications that make the Internet more similar to pay-TV,〞 he predicted.41. What does the underlined word “holdouts〞 in the first paragraph most probably mean?A. some American familiesB. those who hold out one’s opinionsC. those who have been surveyedD. those who still haven’t access to the Internet currently42. Many potential customers refuse to subscribe to the Internet mainly because _________.A. they show too much concern about the costB. they can find little value of itC. they do most YouTube-watching at workD. the Internet doesn’t reach their homes43. From the passage we can infer that ________.A. It is not an easy job to transform those holdouts into the Internet usersB. people will adopt dial-up Internet access no moreC. many Americans enjoy doing e-commerce shopping at homeD. more than half of the population are using the Internet in44. According to John Barrett, what is the key to attracting more U.S. families tobroadband service?A. making the Internet look more similar to TV setB. applying the Internet more to entertainmentC. providing more pay-TV programsD. chipping away at the core of non-subscribers45. Which is the best title for the passage?A. Web develops with technologyB. The present situation of webC. Many Americans see little point to webD. It is urgent to promote web serviceBAgainst the supposition than forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.This finding suggests that taking steps to prevent northern forest to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone〔臭氧〕levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere.〞 Scientists tracked the change in amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicated, 0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.46. According to the new findings, taking steps to prevent northern forest fires may _______.A. result in a warming climateB. cause the forest fires to occur more frequentlyC. lead to a longer fire seasonD. protect the forests and the environment there47. The following are all the immediate effects after a forest fire EXCEPT_________.A. large amounts of greenhouse gases enter the atmosphereB. the levels of ozone which is a type of oxygen increaseC. snow on the ground mirrors more sunlight back into spaceD. ashes from the fire fall on the ice surface and take in more radiation from the sun48. Earlier studies about northern forest fires _________.A. analyze all aspects of how northern fires influence climateB. indicate that forest fires will pollute the atmosphereC. suggest that people should take measures to protect environmentD. suggest that the fires will speed up climate warming49. The underlined phrase “soak up〞 in the last paragraph most probably means ________.A. releasedB. absorbedC. createdD. distributed50. From the passage we can draw a conclusion that forest fires in Alaska, Canadaand Siberia may __________.A. warm the climate as the supposition goesB. allow more snow to reflect more sunlight into space and thus cool the climateC. destroy large areas of forests and pollute the far-off sea iceD. help to gain more energy rather than release more energyCKincaid looked at his watch: eight-seventeen. The truck started on the second try, and he backed out, shifted gears, and moved slowly down the alley under hazy sun. Through the streets of Bellingham he went, heading south on Washington 11, running along the coast of Puget Sound for a few miles, then following the highway as it swung east a little before meeting U.S Route 20.Turning into the sun, he began the long, winding drive through the Cascades. He liked this country and felt unpressed stopping now and then to make notes about interesting possibilities for future expeditions or to shoot what he called “memory snapshots.〞 The purpose of these causal photographs was to remind him of places he might want to visit again and approach more seriously. In later afternoon he turned north at Spokane, picking up U.S. Route 2, which would take him halfway across the northern United States to Duluth, Minnesota.He wished for the thousandth time in his life that he had a dog ,a golden retriever, maybe ,for travels like this and to keep him company at home. But he was frequently away; overseas much of the time and it would not be fair to the animal .Still ,he thought about it anyway. In a few years he would be getting too old for the hard fieldwork. “I must get a dog then.〞 He said to himself.Drives like this always put him into a sentimental mood. The dog was part of it .Robert Kincaid was alone as it’s possible to be—an only child ,parents both dead , distant relatives who had lost track of him and he of them, no close friends.He thought about Marian .She had left him nine years ago after five years ofmarriage. He was fifty-two now , that would make her just under forty .Marian had dreams of becoming a musician ,a folksinger .She knew all of the Weavers’ songs and sang them pretty well in the coffeehouse of Seattle .When he was home in the old days, he drove her to the shows and sat in the audience while she sang.His long absences—two or three months sometimes—were hard on the marriage .He knew that. She was aware of what he did when they decided to get married ,and both of them had a vague(not clear) sense that it could all be handled somehow. It couldn’t when he came from photographing a story in Iceland and ,she was gone . The note read, “Robert ,it didn’t work out ,I left you the Harmony guitar. Stay in touch.〞He didn’t stay in touch .Neither did she .He3 signed the divorce papers when they arrived a year later and caught a plane for Australia the next day. She had asked for nothing except her freedom.51. Which route is the right one taken by Kincaid?A. Bellingham—Washington 11—Puget Sound—U.S Route 20—U.S Route 2—DuluthB. U.S. Route 2—Bellingham—Washington 11—Puget Sound—U.S Route 20—DuluthC. U.S. Route 2—U.S Route 20—Duluth –Bellingham—Washington 11D. Bellingham—Washington 11—U.S. Route 2—U.S Route 20—Duluth52. Which statement is true according to the passage?A. Kincaid’s parents were dead and he only kept in touch with some distant relatives.B. Kincaid would have had a dog if he hadn’t been away from home too much.C. Kincaid used to have a golden retriever.D. Kincaid needed a dog in doing his hard fieldwork.53. Why did Kincaid stop to take photos while driving?A. To write “memory snapshots〞B. To remind himself of places he might want to visit again.C. To avoid forgetting the way back.D. To shoot beautiful scenery along the road.54. What can you know about Marian?A. She died after five years of marriage.B. She was older than Kincaid.C. She could sing very well and earned big money.D. She was not a professional pop singer.55. We can draw a conclusion from the passage that .A. Marian knew what would happen before she married Kincaid.B. Kincaid thought his absence would be a problem when he married Marian.C. It turned out that Marian could not stand Kincaid’s absence and left him.D. After Marian left him, they still kept in touch with each other.参考答案完形填空本文讲述的是该怎样做才能成为对世界有影响之人。
物理限时训练答案
1㌳ 内的位移为：
香 香
1 香
1 香
͵
͵
香 香
香洠
洠
1香
͵͵洠
2. 解：如图以一根丝线为例，每根丝线拉力 ͵ 1；
1
cos͵
香
͵
；
故选：A． 运动员受本身的重力及 24 根丝线的拉力而处于平衡状态； 将丝线的拉力分解为水平和竖直两个方向上的分力， 则竖直上的分力之和等于向下的重力． 本题注意 24 根绳子在竖直方向上的分力均是相同的，而向上的合力与向下的重力一定是大小相等、方向相反 的． 3. 解：选 AB 整体为研究对象，AB 整体具有共同的最大加速度，有牛顿第二定律得：
香
͵Ǥ ʹ
解得
共
对平板由牛顿第二定律： ݃݃ ܯ香 1 ݃ 香 ݉ܯ 解得： 香 Ǥ͵ ݉͵݃由于 香 1 ，共速后煤块将以 1 匀减速到停止，而平板以 ͵ 匀减速 对平板由牛顿第二定律： 1 ݃ ݃݃ ͵ ܯ 香 ݉ܯ 得
͵ 1͵ 4
㠮
香
共
香 ͵
全过程平板位移： 解得
1
共
板
香
݉
香݃
1͵ 4
1
4 1͵
板
全过程煤块位移： 所以板长
煤
香洠
煤
香 1
香 1
板
答： ݉1݃传送带上黑色痕迹的长度是 ͵Ǥ ʹ ； ݉香݃平板与地面间动摩擦因数 香 的大小是 Ǥ͵； ݉͵݃平板上表面至少 1Ǥ洠 长。 【解析】
第 1页，共 4页
1Ǥ洠
4
A、 18s 后汽车做匀速运动， 此时牵引力为： ͵ 1. 解： 故 A 错误。 洠 内，牵引力为： 1 B、 1 ͵ 由牛顿第二定律得： 1 1 代入数据解得： 1 ʹ 㠮 香 。 ʹ 洠 ͵ 㠮 6s 末车速为： 1 1 1 在 洠 1㌳ 内，牵引力为： 香 1 1 ͵ 由牛顿第二定律得： 香 香 解得
2013届高三理科综合能力测试生物部分限时训练(9)
2013届高三理科综合能力测试生物部分限时训练（9）一、选择题(本题包括13小题。
每小题6分，共78分，每小题只有一个选项符合题意) 1．生物的变异与生物的进化，两者关系为A．变异方向与进化方向相同B．变异是不定向的，进化是定向的C．进化促进了变异的出现D．进化速度决定了变异速度2．下列关于氨基酸和蛋白质的叙述，错误的是A．甲硫氨酸的R基是—CH2—CH2—S—CH3，则它的分子式是C5H11O2NSB．酪氨酸几乎不溶于水，而精氨酸易溶于水，这种差异是由R基的不同引起的C．n个氨基酸共有m个氨基,则这些氨基酸脱水缩合成的一个多肽中的氨基数必为m－nD．甜味肽的分子式为C13H16O5N2，则甜味肽一定是一种二肽3．生物实验中常常需要设置对照，以下对照设置正确的是A．研究光照强度对植物光合作用的影响，分别在黑暗和光照条件下进行B．探究温度对酶活性的影响，只需设置0℃和100℃即可C．探究Ca2+的吸收是否为主动运输，使细胞外Ca2+浓度大于或小于细胞内液D．研究细胞核的功能，把蝾螈的受精卵横缢成有核和无核二部分4．某研究组获得了水稻的叶黄素缺失突变体。
对其叶片进行了红光照射，光谱吸收测定和色素层析条带分析（从上至下），与正常叶片相比，实验结果是A．光吸收差异显著，色素带缺第2条 B．光吸收差异不显著，色素带缺第2条C．光吸收差异显著，色素带缺第3条 D．光吸收差异不显著，色素带缺第3条5．以下二倍体生物的细胞中含有两个染色体组的是①有丝分裂中期细胞②有丝分裂后期细胞③减数第一次分裂中期细胞④减数第二次分裂中期细胞⑤减数第一次分裂后期细胞⑥减数第二次分裂后期细胞A．①②③ B．①③⑤ C．①③⑤⑥ D．①④⑤⑥6．在某一种群中随机的抽出100个个体，测得某种性状的基因型为DD、Dd、dd的个体所占比例为10%、85%、5%，但是由于某种环境的变化，基因型为dd的个体被逐渐淘汰。
在这个种群中，D、d的基因频率分别是A.55.3%，44.7%B. 52.5%，47.5%C.47.5% ，52.5%D. 55%，45% 29.（10分）下图是人体某局部组织的模式图，图中箭头表示物质的交换方向，A、B、C表示结构，a、b、c、d表示液体。
高三物理限时训练(9、23)
高三物理限时训练 （9、23）一、选择题：（本题共计16个题，每题4分，共64分）1、关于摩擦力做功的下列说法中,正确的是：( )A 、滑动摩擦力只能做负功B 、滑动摩擦力也可能做正功C 、静摩擦力不可能做功D 、静摩擦力不可能做正功2、在新疆旅游时，最刺激的莫过于滑沙运动．某人坐在滑沙板上从沙坡斜面的顶端由静止沿直线下滑到斜面底端时，速度为2v 0，设人下滑时所受阻力恒定不变，沙坡长度为L ，斜面倾角为α，人的质量为m ，滑沙板质量不计，重力加速度为g ，则：( )A 、若人在斜面顶端被其他人推了一把，沿斜面以v 0的初速度下滑，则人到达斜面底端时的速度大小为3v 0B 、若人在斜面顶端被其他人推了一把，沿斜面以v 0的初速度下滑，则人到达斜面底端时的速度大小为5v 0C 、人沿沙坡下滑时所受阻力F f ＝mg sin α－2m v 20LD 、人在下滑过程中重力功率的最大值为2mg v 03、如图1所示，质量为m 的物体静放在水平光滑平台上，系在物体上的绳子跨过光滑的定滑轮由地面以速度v 0向右匀速走动的人拉着，设人从地面上且从平台的边缘开始向右行至绳和水平方向成30°角处，在此过程中人所做的功为:( )A. mv 02／2B.mv 02C 2mv 02／3D. 3mv 02／8 图14、木块在水平恒定的拉力F 作用下，由静止开始在水平路面上前进s ，随即撤去此恒定的拉力，接着又前进了2s 才停下来．设运动全过程中路面情况相同，则木块在运动中获得动能的最大值为：( )A 、12FsB 、13FsC 、FsD 、23Fs5、如图2所示，一水平传送带以速度v 1向右匀速传动，某时刻有一物块以水平速度v 2从右端滑上传送带，物块与传送带间的动摩擦因数为μ，则：( ) 图2A 、如果物块能从左端离开传送带，它在传送带上运动的时间一定比传送带不转动时运动的时间长B 、如果物块还从右端离开传送带，那么整个过程中，传送带对物块所做的总功一定不会为正值高三物理限时训练 （9、23）第1页（共6页）C 、如果物块还从右端离开传送带，那么物块的速度为零时，传送带上产生的滑痕长度达到最长D 、物块在离开传送带之前，一定不会做匀速直线运动6、竖直上抛一球，球又落回原处，已知空气阻力的大小正比于球的速度，则：( ) A 、上升过程中克服重力做的功大于下降过程中重力所做的功 B 、上升过程中克服重力做功等于下降过程中重力所做的功C 、上升过程中克服重力做功的平均功率大于下降过程中重力做功的平均功率D 、上升过程中克服重力做功的平均功率等于下降过程中重力做功的平均功率 7、如图3所示，质量为M 的木块放在光滑的水平面上，质量为m 的子弹以速度v 0沿水平射中木块，并最终留在木块中与木块一起以速度v 运动.已知当子弹相对木块静止时，木块前进距离L ，子弹进入木块的深度为s.若木块对子弹的阻力f视为恒定，则下列关系式中正确的是:（ ） 图3A ．f s =21mv 2B ． fL =21Mv 2C ．f （L ＋s ）= 21mv 2 － 21mv 02D ．f s =21mv 02－21（M ＋m ）v 28、起重机的钢索将重物由地面吊到空中某个高度，其速度—时间图像如图4所示，则钢索拉力的功率随时间变化的图像可能是图5中的：()图5 图4 9、如图6所示，飞船从轨道1变轨至轨道2。
9-限时规范训练
9．文言文阅读(二)一、阅读下面的文言文，完成1～5题。
(18分)真州东园记欧阳修真州当．东南之水会，故为江淮、两浙、荆湖发运使之治所。
龙图阁直学士施君正臣，侍御史许君子春之为使也，得监察御史里行马君仲涂为其判官。
三人者，乐其相得之欢，而因．其暇日，得州之监军废营以作东园，而日往游焉。
岁秋八月，子春以其职事走京师，图其所谓东园者来以示．予曰：“园之广百亩，而流水横其前，清池浸其右，高台起其北。
台，吾望以拂云之亭；池，吾俯以澄虚之阁；水，吾泛以画舫之舟。
敞其中以为清宴之堂，辟其后以为射宾之圃。
芙渠芰荷之艳丽，幽兰白芷之芬芳，与夫佳花美木列植而交阴，此前日之苍烟白露而荆棘也；高甍巨桷，水光日景，动摇而上下，其宽闲深靓，可以答远响而生清风，此前日之颓垣断堑而荒墟也；嘉时令节，州人士女啸歌而管弦，此前日之晦冥风雨、鼪鼯鸟兽之嗥音也。
吾于是信．有力焉。
凡图之所．载，皆其一二之略也。
若乃升于高以望江山之远近，嬉于水以逐鱼鸟之浮沉，其物象意趣、登临之乐，览者各自得焉。
凡工之所不能画者，吾亦不能言也。
其为．吾书其大概焉！”又曰：“真，天下之冲也。
四方之宾客往来者，吾与之共乐于此，岂独私吾三人者哉？然而池台日益以新，草木日益以茂，四方之士无日而不来，而吾三人者有时而皆去也，岂不眷眷于是哉？不为之记，则后孰知其自吾三人者始也？”予以为三君子之材贤足以相济，而又协．于其职，知所后先，使上下给足，而东南六路之人无辛苦愁怨之声；然后休其余闲，又与四方之贤士大夫共乐于此。
是皆可嘉也，乃．为之书。
庐陵欧阳修记。
1．对下列句子中加点的词语，解释正确的一项是(3分) () A．真州当．东南之水会当：应当B．图其所谓东南者来以示．予示：指示C．吾于是信．有力焉信：相信D．而又协．于其职协：协助解析A．地处、处于，B.给……看，D.协调、配合。
答案 C2．下列各组句子中，加点词的意义和用法相同的一项是(3分) () A．①而因．其暇日②不如因．而厚遇之B．①凡图之所．载②而为秦人积威之所．劫C．①其为．吾书其大概焉②持其踵为．之泣D．①乃．为之书②以其乃．华山之阳名之也解析A．趁着；B.“所”字结构/表被动；C.替/对；D.于是，就/表判断。
2014高考英语二轮阅读理解限时训练精品题(9)及答案
2014高考英语二轮阅读理解限时训练精品题（9)及答案[史地自然型阅读理解（一）]-—-——AThe Pacific island nation of Nauru used to be a beautiful place.Now it is an ecological disaster area。
Nauru's heartbreaking story could have one good consequence—other countries might learn from its mistakes。
For thousands of years，Polynesian people lived in the remote island of Nauru，far from Western civilization.The first European to arrive was John Fearn in 1798。
He was the British captain of the Hunter，a whaling ship.He called the island Pleasant Island.However，because it was very remote, Nauru had little communication with Europeans at first.The whaling ships and other traders began to visit it，bringing guns and alcohol。
These elements destroyed the social balance of the twelve family groups on the island.A ten.year civil war started，which reduced the population from 1，400 to 900。
高二下英语45分钟限时训练9
三明一中2020—2021学年下学期开学考试高二英语试卷第二部分阅读理解(共两节，满分50分)第一节（共15小题；每小题2.5分，满分37.5分）阅读下列短文, 从每题所给的A、B、C和D四个选项中, 选出最佳选项, 并在答题卡上将该项涂黑。
ATired of your winter break? Here comes a list of best sellers on .Born a Crimeby Noah TrevorBorn a Crime is the story of a naughty young boy in South Africa, who grows into a restless young man, the author of the book, as he struggles to find himself in a world where he was never supposed to exist. It is also the story of that young man’s relationship with his fearless and religious mother. “Don’t cry, Trevor. Trevor, listen. Listen to me. L isten.”“My child, you must look on the bright side.” It was Mother’s faith and positive attitude that shaped the young man.How It Feels to Floatby Helaia FoxIf y ou’re looking for a moving story that explores themes of mental illness, grief (悲痛), and love, pick up a copy of How It Feels to Float and follow Biz as she comes of age. This moving novel will stay with you long after you finish reading it.Two Can Keep a Secretby Karen M. MeManusPut on your crime-solving cap and get swept away in this thriller about a girl, a boy, and a string of unsolved murders. As threats and clues pile up, you’ll be burning the midnight oil trying to finish the book before dawn.Duneby Frank HerbertIf the Star W ars movies have made you fall in love with the space opera, eventually you’re going to read Frank Herbert’s most famous creation. The story of centuries-old political plotting — about warring factions (派系) battling over control of the extremely valuable planet Arrakis — is a classic and remains a wonderful introduction to the larger, more complex world of science fiction just beyond the Star W ars trilogies.21. Which books are about growth?A.How It Feels to Float and Two Can Keep a Secret.B.Born a Crime and How It Feels to Float.C.Two Can Keep a Secret and Dune.D.How It Feels to Float and Dune.22.What is Two Can Keep a Secret mainly about?A.Challenges of growing up.B.A girl’s space adventures.C.The murders remaining to be settled.D.Battling for control of another planet.23.What kind of book is Dune?A. A love story.B. A science-fiction story.C. A fairy tale.D. An autobiography.BAfter seeing the famous movie series Pirates of the Caribbean(《加勒比海盗》), Alexander Marchenko, a 38-year-old businessman from a small Russian village，decided to build his very own copy of the Black Pearl pirate ship.Marchenko has traveled all over Russia, and believes that there is no other land more beautiful than his hometown. He decided to take advantage of the beautiful environment and build a hotel.He had noticed the other restaurants and hotels in the area all looked the same way, so he tried to come up with something special that would attract visitors. He was wondering what kind of hotel he would build when the Black Pearl came into his mind. He decided to build his own Black Pearl ship. Without any ship building experience, he went online and downloaded photos of famous ships to use as guides. And he started working on it immediately. It's been two years since he worked on his ship. Now, his own Black Pearl is starting to take shape on the Yenisei River.The 21-meter-long vessel is made of wood produced locally, and the ship's “captain” plans to add all the tiniest details of the original Black Pearl. Right now，Marchenko is working on the interior decorations. He spends most of his time in the workshop, making all the little designs by hand. So far, he has spent 3.5 million rubles.Marchenko hopes to finish the work this summer. Judged by the attention his ship is getting in its current state, he believes that upon completion, tourists will flock to see his wooden wonder.24. What does Alexander Marchenko believe?A. His hometown is cleaner than any other village.B. His small village will become a tourist attraction.C. He can build the Black Pearl pirate ship with ease.D. His hometown is more beautiful than any other land.25. Which of the following words can be used to describe his hotel？A. Tiny.B. Expensive.C. Special.D. Environmentally-friendly.26. What does t he underlined word “vessel” in Paragraph 4 probably mean?A. Car.B. Movie.C. Hotel.D. Ship.27. What does Marchenko think of the future of his hotel？A. He is worried about its success.B. He is doubtful about its success.C. He is very confident of its success.D. He is not aware of the hotel's future.第二节(共5小题；每小题2.5分，满分12.5分)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。
河南省滑县第六高级中学高中英语 限时练9 北师大版选修8
河南省滑县第六高级中学高中英语限时练9一．阅读理解（2*8=16）AEven before my father left us, my mother had to go back to work to support our family. Once I came out of the kitchen, complaining, “Mom, I can’t peel potatoes. I have only one hand.”Mom never looked up from sewing. “You get yourself into that kitchen and peel those potatoes,” she told me. “And don’t ever use that as an excuse for anything again!”In the second grade, our teacher lined up my class on the playground and had each of us race across the monkey bars, swinging from one high steel rod to the next. When it was my turn, I shook my head. Some kids behind me laughed, and I went home crying. That night I told Mom about it. She hugged me, and I saw her “we’ll see about that” look. The next afternoon, she took me back to school. At the deserted playground, Mom looked carefully at the bars.“Now, pull up with your right arm,” she advised. She stood by as I struggled to lift myself with my right hand until I could hold the bar with my other elbow （肘）. Day after day we practiced, and she praised me for every rung （横档）I reached. I’ll never forget the next time, crossing the rungs, I looked down at the kids who were standing with their mouths open.One night, after a dance at my new junior high, I lay in bed sobbing. I could hear Mom come into my room. “Mom,” I said, weeping, “none of the boys would dance with me.”For a long time, I didn’t hear anything. Then she said, “Oh, honey, someday you’ll be beating those boys off with a bat.” Her voice was fai nt. I peeked out from my covers to see tears running down her cheeks. Then I knew how much she suffered on my behalf. She had never let me see her tears.1. Which can be used to describe Mom’s attitude when she made the child peel potatoes?A. Cruel.B. Favorable.C. Strict.D. Sympathetic.2. From the passage, we know monkey bars can help a child train ______.A. the strength and skill to hang and swayB. the speed of one’s hand movementC. the skill to throw and catch thingsD. the bodily skill to rotate round a bar3. What does the sentence “I saw her ‘we’ll see about that’ look” imply?A. Mom believed every aim could be achieved if you stuck to it.B. The race across monkey bars was not difficult enough for a child to give up.C. Mom was determined to prove she herself was better than the teacher.D. What the child had said brought Mom great attraction and curiosity.4. When the author looked down at the kids, they were standing with their mouths open because_______.A. they felt sorry for what they had done beforeB. they were afraid the author might fall off and get hurtC. they wanted to see what the author would do on the barsD. they were astonished to find the author’s progressBMr. and Mrs. Gordon were sitting on the sand, reading their magazines. Mr. Gordon was too stingy (吝啬) to rent a chair. Their twelve-year-old daughter. Sandra, was playing at the water's edge. Suddenly a huge wave lifted Sandra up and carried her out to sea. Luckily, a lifeguard(救生员) was on duty and he saw the wave carry Sandra away. He ran along the beach and dived into the sea. He swam quickly to where the girl, with her head only just above the water, was shouting for help. She was very frightened. When the lifeguard reached her, she struggled with him, as drowning (快淹死) people often do. However, he was a skillful lifeguard and quickly took hold of her and swam with her back to the beach. By the time he reached it, Mr. and Mrs. Gordon had realized what had happened. They had run down to the water's edge, neither of them could swim. They just stood in the shallow water, and worried about their daughter. Had the lifeguard reached her in time? Luckily, he had. "That was quick work, young man," Mr. Gordon said. He turned to his wife, "Give the lifeguard a dollar. ""A dollar!" Sandra cried," dad, how can you give him a dollar! He saved my life.I was half dead. "" Quite right, girl " Mr. Gordon said, pleased by his daughter's awareness of the value of money. He turned to his wife again and said," She's right. She was only half dead. Give him fifty cents. "5. What happened to Sandra?A. She ran into the sea.B. She died.C. She was drowned.D. Her life was saved by a lifeguard.6. What did Mr. and Mrs. Gordon do when Sandra was carried out to sea by the wave?A. They shouted to the lifeguard.B. They dived into the water.C. They offered the lifeguard money to save Sandra.D. Perhaps they were reading magazines.7. Why was Sandra angry with her father?A. He didn't give the lifeguard any money.B. He didn't swim out to save her.C. He didn't show the lifeguard hearty thankfulness.D. He gave the lifeguard too much money.8. Why was Mr. Gordon pleased with her daughter.A. She was safe again.B. She was polite to the lifeguard.C. He thought she did not want him to give the lifeguard too much money.D. She gave the lifeguard fifty cents.二：完形填空（共20小题;每小题1.5分，满分30分）阅读下面短文，从短文后各题所给的四个选项（Ａ，Ｂ，Ｃ，和Ｄ）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
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s1 =
qu0 2T qu0 2T ⋅ ⋅ + 2dm 3 dm 3
2
2 T qu0 T 7 qu0T ⋅ − ⋅ = 18dm 3 2dm 3
2
当粒子由 t = nT +
2T 时刻进入电场，向上侧移最大，则 3
2
qu0 T qu0T 2 s2 = ⋅ = 2dm 3 18dm
U 0 qT 2 U 0 qT 2 ) +( ) = 3dm 3dm vy = 1 ⇒ θ = 45 ° v0
2U 0 qT 3dm
设速度方向与 v0 的夹角为 θ，则
tan θ =
（3）要使平行粒子能够交于圆形磁场区域边界且有最小区域时，磁场直径最小值与粒子宽度相等 粒子宽度
D= D = 2
4qU 0T 2 2 2qU 0T 2 cos 45o = 9md 9dm
答题卡
题号 答案 1 ABD 2 B 3 C 4 AD 5 B 6 BD 7 BCD 8 ABD 9 C 10 D
11． 1） a = g sin θ − µg cos θ ． ） （
（2） E = ）
2mgd (r + R) gR tan θ
12． （3）若要使打出电场的粒子经某一垂直纸面的圆形区域匀强磁场偏转后，都能通过圆 ． 形磁场边界的一个点处， 而便于再收集， 则磁场区域的最小半径和相应的磁感强度是多大？ ： （1）当粒子由 t = nT 时刻进入电场，向下侧移最大，则
故磁场区域的最小半径为
r=
2qU 0T 2 粒子在磁场中作圆周运动有 9dm
1
qvB = m
v2 r
解得 B =
3m qT
2
3
4
在距离 O 中点下方
/
A
7 qu0T 2 qu T 2 至上方 0 范围 18dm 18dm
O
v0 B (a)
O/
θ
D
内有粒子打出。 （2）打出粒子的速度都是相同的，在沿 电场线方向速度大小为
vy =
以打出速度大小为
u0 q T u0 qT ⋅ = dm 3 3dm
所
2 v = v0 + v 2 = ( y