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天天练 5At the age of three, I was discovered to be totally deaf. Having consulted many specialists, my parents made a(n) 31 that would forever alter my future. 32 sending me to a special
education school for the deaf, they chose an ordinary one for me. All of my schoolmates and teachers there would have 33 hearing. I experienced great 34 throughout my primary school because, in addition to the problems of 35 with the other students, I also 36 with most of my school work. I seemed to spend every spare moment doing homework just so I could 37 . 38 for me, Mrs. Jordan, my 5th grade teacher, changed all of that with a simple three-word phrase. One morning, she asked the class a question. I 39 her lips and immediately raised my hand. Here was an opportunity to impress the powerful teacher and even my classmates. Although a little afraid when I heard my named called, I felt unusually 40 because I was sure I had the right answer. I took a deep breath and Her response 42 all of us. Mrs. Jordan enthusiastically 43 44 41 answered Mrs. Jordan's question. her right it pointed foot on the floor and turned her right hand around in a full circledirectly at me. With shining eyes she cried, &THAT'S RIGHT, STEPHEN!& For the first time in my young life, I was an instant star. My heart burst with 45 . Smiling widely, I sat a little taller in my chair. My confidence never before. I decided right then and there that I would make a(n) world. No matter how many overcome them. The very three-word phrase entirely my grades and speech improved greatly, my 31. A. decision 32. A. Apart from 33. A. strong 34. A. excitement 35. A. making up 36. A. struggled 37. A. leave behind 38. A. Gradually 39. A. found 40. A. confident B. effort B. Rather than B. normal B. sympathy B. handled B. turn out B. Eventually B. read 49 50 my young life. From that day on, among my classmates increased, D. attempt D. Instead of D. sharp D. authority D. fitting in D. absorbed D. keep up D. Subsequently D. appreciated D. jealous 48 47 46 like in thisI might come across in life, I knew I couldand my viewpoint on life did a complete turnabout. C. commitment C. Regardless of C. weak C. anxiety C. impressed C. take off C. Luckily C. observedB. getting away C. coming upB. embarrassed C. frightened41. A. carelessly 42. A. fooled 43. A. hit 44. A. unless 45. A. regret 46. A. increased 47. A. fortune 48. A. feelings 49. A. devoted 50. A. hardshipB. nervously B. delighted B. stepped B. since B. pride B. declined B. impression B. obstacles B. surrounded B. characterC. casually C. surprised C. placed C. after C. envy C. escaped C. living C. occupied C. popularityD. naturally D. upset D. settled D. until D. courage D. built D. difference D. transformed D. healthC. competitions D. opportunitiesSome people think that success is only for those with talent or those who grow up in the right family, and others believe that success mostly comes down to luck. I’m not going to say luck, talent, and circumstances don’t come into play because they do . Some people are born into the right family while others are born with great intelligence, and that’s just the reality of how life is. However, to succeed in life, one first needs to set a goal and then gradually make it more practical. And, in addition to that, in order to get really good at something, one needs to spend at least 10,000 hours studying and practicing. To become great at certain things, it’ll require even more time, time that most people won’t put in. This is a big reason why many successful people advise you to do something you love. If you don’t enjoy what you do, it is going to feel like unbearable pain and will likely make you quit well before you ever become good at it. When you see people exhibiting some great skills or having achieved great success, you know that they have put in a huge part of their life to get there at a huge cost. It’s sometimes easy to think they got lucky or they were born with some rare talent, but thinking that way does you no good, and there’s a huge chance that you’re wrong anyway. Whatever you do, if you want to become great at it, you need to work day in and day out, almost to the point of addiction, and over a long period of time. If you’re not willing to put in the time and work, don’t expect to receive any rewards. Consistent, hard work won’t guarantee you the level of success you may want, but it will guarantee that you will become really good at whatever it is you put all that work into. 51. Paragraph 1 mainly talks about ______. A. the meaning of success B. the reasons for success C. the standards of success D. the importance of success 52. Successful people suggest doing what one loves because ______. A. work makes one feel pain B. one tends to enjoy his work C. it takes a lot of time to succeed D. one gives up his work easily 53. What can we infer from Paragraph 4? A. People sometimes succeed without luck or talent. B. Successful people like to show their great skills.C. People need to achieve success at the cost of life. D. It helps to think that luck or talent leads to success. 54. What is the main theme of the passage? A. Having a goal is vital to success. B. Being good is different from being great. C. Luck, talent and family help to achieve success. D. One cannot succeed without time and practice. WHEN there are some strangers in front of us, which of them will we trust? According to a new study in the online PLOS One, people make their decisions to trust others largely based on their faces. Your appearance can do a lot for you, especially if you are in the financial industry. The more trustworthy you look, the more likely people will buy what you’re selling. Researchers from Britain’s University of Warwick Business School, University College London, and Dartmouth College, US, did a number of experiments. The research team used computer software to make 40 faces, from the least to the most trustworthy-looking. The study said that the difference between a trustworthy face and one that isn’t as trustworthy comes from features that look slightly angry or slightly happy, even when the face is at rest. However, a slightly happy face is more likely to be trusted. Researchers gave participants some money and asked them which face they trusted to invest the money for them. Then researchers gave some good and bad information about the people with these faces, and asked the participants again whom they trusted. The results showed that even if they got different information, the participants didn’t change their choices. They were still more likely to invest their money with the more trustworthy-looking faces. Chris Olivola, one of the study’s authors, said in the University of Warwick’s press release: “It seems we are still willing to go with our own instincts about whether we think someone looks like we can trust them. The temptation to judge strangers by their faces is hard to resist.” 55. Which of the following can be a proper title for this passage? A. What kind of face do you trust? B. Who did the experiments? C. Why do you trust him or her? D. Why did they do the experiments? 56. According to the study, which of the following faces is most likely to be trusted? A. A sad face. B. A smiling face. C. A crying face. D. An angry face. 57. Which of the following about the experiment is TRUE? A. The trustworthy faces were given good information. B. Researchers took photos of the 40 people’s faces in college. C. Most participants gave their money to the trustworthy-looking faces. D. Participants liked to choose the faces with good information. 58. What did the researchers learn from their experiment? A. People can’t refuse temptations.B. People always do things with their instincts. C. People often judge strangers by their faces. D. People don’t trust strangers with sad faces. We all know the importance of curiosity, and here are some tips on how to develop it. Keep an open mind. This is essential if you are to have a curious mind. Be open to learning, unlearning, and relearning things. 36 Therefore, you should be prepared to accept this possibility and change your mind. 37 Most people just accept the world as it is. This way, they will certainly lose the “holy curiosity”. Try to dig deeper beneath the surface of what is around you. A sure way to dig deeper beneath the surface is asking questions. What, why, when, who, where, and how are the questions curious people always ask. Don’t label anything as boring. Whenever you label something as boring, you close one more door of possibilities. Curious people are unlikely to consider things boring. 38 Even if they don’t yet have time to explore them, they will leave the door open to be visited another time. Take learning as something fun. If you see learning as a burden, there’s no way you will want to dig deeper into anything. That will just make the burden heavier. However, if you think of learning as something fun, you will naturally want to dig deeper. 39 Read diverse materials. It will introduce you to the possibilities and excitement of other worlds which may attract your interest in exploring further. One easy way to do this is through reading diverse materials. 40 It’ll feed your mind with the excitement of a new world. A. Never take things as granted. B. Don’t spend too much time on just one world. C. Try to pick a book or magazine on a new subject. D. Some things you know and believe might be wrong. E. It doesn’t matter that you don’t agree to others’ opinions. F. Instead, they always see these things as a door to an exciting new world. G. So look at life through the glasses of fun and enjoy the learning process. Do you read reviews after you see a movie? I use to do that, but I usually regretted. I read so much about a movie on advance that I often ended up not go to see it at all. The writers point out everything that is wrong with the film, but seldom mentions anything good about one. They also tell many things and even the ending of the movie. Lately I have changed way I choose movies to watch. I read reviews afterwards if necessary. What is very importance to me is that I don’t watch the talk shows in that people discuss movies. And I don’t ask other people how they like of it. Now, I enjoy myself even more.
正比例函数习题精选(含答案) 一.选择题(共 10 小题) 1.下列函数表达式中,y 是 x 的正比例函数的是( 2 A.y=2x B. y= 2.若 y=x+2b 是正...正弦定理练习题_数学_高中教育_教育专区。正弦定理练习题 1.在△ABC 中,∠A=45° ,∠B=60° ,a=2,则 b 等于( A. 6 B. 2 C. 3 2.在△ABC 中,...高二生物免疫调节练习题一、单项选择题: 1 2 3 11 21 31 41 12 22 32 42 13 23 33 43 4 14 24 34 44 5 15 25 35 45 6 16 26 36 46 7 17 ...应收账款坏账准备 练习题 1、甲企业 2008 年末应收账款余额为 600 000 元;2009 年发生坏账 损失 8 000 元,其中:A 公司 6 000 元,B 公司 2 000 元,...习题一参考答案 1、CD 因为忽略空气阻力,所以两石块的运动是自由落体运动,又因为同时从同一高度下 落,所以运动情况完全一样,则 CD 正确 2、C 自由落体运动是初...高数导数的应用习题及答案_数学_自然科学_专业资料。第三章 中值定理与导数的应用 复习题 一、是非题:1.函数 f (x ) 在 [a, b] 上连续,且 f (a ) ...小学语文阅读题及答案【50道】_学科竞赛_小学教育_教育专区。小学语文阅读题精选含答案《母爱是一根穿针线》 【001】 母亲为儿子整理衣服时,发现儿子衬衣袖子上的...进制转换练习题 1.十进制数 1000 对应二进制数为___,对应十六进制数为___。 供选择的答案 A:①
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简单学习网的平板怎么刷机啊？usb被锁
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不能联网不能连接usb。&&拆开机器来看主板。没错的话主板应该有个有芯片的，几脚的不知道。（关于芯片自己上网查）把芯片焊下来，换个同型号的的上去应该就好使了
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不能联网不能连接usb。&&拆开机器来看主板。没错的话主板应该有个有芯片的，几脚的不知道。（关于芯片自己上 ...
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简单学习网课后练习一
轮次：高考总复习课程--2012高考物理第一轮复习
专题：电流——直流电经典精讲
主讲教师：徐建烽
北京著名物理高级教师
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高考总复习课程--2012高考物理第一轮复习
专题：电流——直流电经典精讲
主讲教师：徐建烽
金题精讲题一
如图所示，A1、A2是两只完全相同的电流表(内阻不可忽略)，电路两端接恒定电压U，这时A1、A2的示数依次为5 mA和3 mA.若将A2改为和R2串联，仍接在恒定电压U之间，这时电表均未烧坏．下列说法正确的是(　　)
A．通过电阻R1的电流必然增大
B．通过电阻R2的电流必然增大
C．通过电流表A1的电流必然增大
D．通过电流表A2的电流必然增大
一台国产封闭型贮水式电热水器的铭牌上所列的主要技术参数如下表所示．根据表中所提供的数据，计算出此电热水器在额定电压下处于加热状态时，通过电热水器的电流约为(　　 )
额定容量 54 L 最高水温 75℃
额定功率 1500 W 额定压力 0.7 MPa
额定电压 220 V 电器类别 Ⅰ类
已知如图，电源内阻不计。为使电容器的带电量增大，可采取以下些方法：
已知如图，两只灯泡L1、L2分别标有“110V，60W”和“110V，100W”，另外有一只滑动变阻器R，将它们连接后接入220V的电路中，要求两灯泡都正常发光，并使整个电路消耗的总功率最小，应使用下面哪个电路？
如图所示的电路中，定值电阻R=3 Ω，当开关S断开时，电源内、外电路消耗的功率之比为1∶3；当开关S闭合时，内、外电路消耗的功率之比为1∶1.求开关S闭合前和闭合后，灯泡L上消耗的功率之比（不计灯泡电阻的变化）.
某一电源的路端电压与电流的关系和电阻R1、R2的电压与
电流的关系如图所示．用此电源和电阻R1、R2组成电路．R1、R2可以同时接入电路，也可以单独接入电路．为使电
源输出功率最大，可采用的接法是 （
A．将R1、R2串联后接到电源两端
B．将R1、R2并联后接到电源两端
C．将R1单独接到电源两端
D．将R2单独接到电源两端以上练习题答案及详解：
【解析】由A1、A2的示数依次为5 mA和3 mA，可知R1＋RA2＜R2，由于并联电路各支路中最小的电阻越小，总电阻越小，故当把A2改为和R2串联时，电路中总电阻减小，总电流变大，C对；由于总电流增大，电流表A1两端电压增大，并联支路两端电压减小，而R2所在支路电阻增大，故通过R2和电流表A2的电流必然减小，所以通过R1的电流必然增大，A对．
【解析】由P＝UI可知，该电热水器在额定电压下处于加热状态时的电流为：I＝＝ A≈6.8 A，故选项A正确．
【解析】由于稳定后电容器相当于断路，因此R3上无电流，电容器相当于和R2并联。只有增大R2或减小R1才能增大电容器C两端的电压，从而增大其带电量。改变R3不能改变电容器的带电量。因此选BD。
【解析】A、C两图中灯泡不能正常发光。B、D中两灯泡都能正常发光，它们的特点是左右两部分的电流、电压都相同，因此消耗的电功率一定相等。可以直接看出：B图总功率为200W，D图总功率为320W，所以选B。
设电源电动势为E，内阻为r.开关S断开时，
开关S闭合时，
R并=r， U并=E
所以UL′=E
【解析】这是直流电中的电路问题，由图像容易判断电源的电动势为3V，内阻为0.5Ω，R1单独接到电源两端输出功率为1.5V3A=4.5W，R2单独接到电源两端输出功率则为2V2A=4W，且计算得R1、R2的电阻分别为0.5Ω、1Ω，当将R1、R2串联后接到电源两端利用欧姆定律可得电路电流1.5A，此时路端电压为1.5A 1.5Ω=2.25V，输出功率为2.25V 1.5A =3.375 W；而将R1、R2并联后接到电源两端同理可求得输出功率为4.32W，因此将R1单独接到电源两端电源输出功率最大.
实际上，本题还有更为简单的解法，因为电源的内阻为0.5Ω，所以外电路的电阻等于0.5Ω电源输出功率最大.
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