We have a problem with the computer system

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外研社英语七年级 模块7 Computers知识点 归纳

外研社英语七年级 模块7 Computers知识点 归纳

外研社七年级英语模块7 Computers 知识点归纳知识点一:模块7短语1.what about… …怎么样2.click the mouse on 点击鼠标在……3.turn on/off 翻开/关闭4.on the left of在…的左边5.listen to music听音乐6.watch movies看电影10.talk to friends和朋友讨论11.play computer games玩电脑游戏12.cleck email检查电子邮件13.send email to sb.发电子邮件给某人14.search for information搜索信息15.go to the Internet上网7.check times of trains查看火车时刻表8.make travel plans制定旅行方案9.buy tickets买票16.share a computer 共用一台电脑17.work for a company在一家公司上班e the keyboard用键盘知识点二:重点词语解释unit one1 connect v. 连接First, connect the screen to the computer.首先,把屏幕连接到电脑上.Let's connect the computer to/with the printer. 我们把电脑与打印机连接起来吧.connect…to/with…,意为“把…与…连接〞.但是,当主语是物时,connect只能与with连用.例如:The mouse connects with the computer. 鼠标连接到了电脑上.2 turn v. 转动Finally, turn on the computer.最后,翻开电脑.Turn off the radio, please. 请关掉收音机.含有turn的常见短语:turn on意为“翻开;接通(电源、电器)〞,其反义短语是turn off.The radio is too noisy. Please turn it off.收音机太吵了.请关掉它.turn up意为“调高(音量)〞;turn down意为“调低(音量)〞.turn on与open的区别(1)turn on多指翻开电器(电视、电脑或收音机等)的开关,接通电源.(2)open多指翻开书本、门窗、电脑文档等.其反义词为close.3 How do I write my homework on the computer? 我如何在电脑上写作业?特殊疑问句的结构是“特殊疑问词+一般疑问句?〞.特殊疑问词有how(怎样),what(什么), when(什么时候), where(什么地方), how many(多少)等.4 learn v.学;学习Can I learn?我可以学吗?We learn English at school.我们在学校学习英语.learn的常见用法:(1)learn from sb.意为“向某人学习〞.例如:Let's learn from Lei Feng.让我们向雷锋学习.(2)learn to do sth. 意为“学习做某事〞.例如:The girl is learning to dance.这个女孩正在学习跳舞.(3)learn about 意为“得知;了解〞.例如:I want to learn about your new friend.我想了解一下你的新朋友.4 First,open a new document…Next, you write your homework…then click “save〞…Finally…首先,新建一个文档……下一步,写你的作业……然后,点击“保存〞……最后……(1)描述一个动作过程的先后顺序,常用副词:first…next…then…finally… 意为“首先…其次…然后…最后…〞.(2) next还有“下一个;隔壁〞等意思.例如:next week 下周;in the next room 在隔壁房间(3)finally的同义词组是at last,at last的反义词组是at first.5 paper n.纸What about some paper?来点纸吗?Please give me a piece of paper. 请给我一张纸.paper意为“纸〞,为不可数名词,表示“几张纸〞,要用量词piece.例如:a piece of paper 一张纸;two pieces of paper 两张纸.paper作“报纸;试卷;论文〞讲时,为可数名词.例如:a test paper 一张测试卷unit two1 plan n. 方案v. 方案;打算He also goes on the Internet to check the times of trains, make travel plans, and buy tickets.他也上网查看火车时刻、制定旅游方案并买票.They plan to learn Chinese. 他们方案学习汉语.plan to do sth.表示“方案做某事〞.2. information n. 信息On the Internet, I search for information, do my homework and check my email.在网上,我搜索信息、做作业和查看邮件.information是不可数名词,不能直接与a/an连用.假设要表达“一条信息〞,用 a piece of information;表达“多条信息〞要用复数pieces.information后面常接介词on或about,表示“关于……的信息〞.例如:I got some information about him. 我得到了一些关于他的信息.3. sometimes adv. 有时候;不时But sometimes I play a lot of computer games and my mother doesn't like it.但是有时我玩太多电脑游戏,我妈妈不喜欢.They sometimes go to school on foot. 他们有时候步行上学.sometimes是一个频度副词,表示偶尔发生,在句中位于be动词之后,实义动词之前,常用于一般现在时,与always (总是), usually (通常), often (经常), seldom (很少), never (从不)用法相同.4. Who shares a computer with his father?谁和他的爸爸共用一台电脑?(1)who意为“谁〞,用于询问主语,谓语动词用第三人称单数形式.例如:Who does homework on the computer?谁在电脑上做作业?(2)share sth. with sb. 意为“和某人共同使用/分享某物〞例如:I share the new bike with my son.我和我儿子共同使用那辆新自行车.5 There is no computer in my home.我家没有电脑.句中no 是形容词,意为“没有〞,“no+名词〞相当于“not a/an+可数名词单数〞或“not any+可数名词复数/不可数名词〞.例如:There is no book on the desk.=There is not a book on the desk. 课桌上没有书.He has no children.=He doesn't have any children. 他没有孩子.There is no water in the bottle.=There isn't any water in the bottle. 瓶子里没有水.知识点三:语法归纳:特殊疑问句1.特殊疑问句=特殊疑问词+一般疑问句以疑问词开头,对句中某一成分提问的句子叫特殊疑问句.常用的疑问词有:what who whose which when where how why等.特殊疑问句有两种语序:a.如疑问词作主语或主语的定语,即对主语或主语的定语提问,其语序是陈述句的语序:疑问词〔+主语〕+谓语动词+其他成分?如:who is singing in the room﹖whose bike is broken﹖b.如疑问词作其他成分,即对其他成分提问,其语序是:疑问词+一般疑问句语序?如:what class are you in﹖What does she look like﹖Where are you from﹖What time does he get up every morning﹖How do you know﹖2.特殊疑问句+助动词+主语+动词原形+其他?例如:Where do you do study English?3.特殊疑问句+be动词+主语+其他?例如:Why is your Mum so angry?4.特殊疑问句+情态动词+主语+动词原形+其他?例如:What can I do for you?特殊疑问词的用法。

七年级英语学科学习困难及解决方法单选题50题

七年级英语学科学习困难及解决方法单选题50题

七年级英语学科学习困难及解决方法单选题50题1. I always forget new words. What should I do to remember them ____?A. goodB. wellC. niceD. fine答案:B。

本题考查副词的用法。

“remember”是动词,需要用副词来修饰,A 选项“good”是形容词,C 选项“nice”也是形容词,D 选项“fine”作形容词时表示“好的;健康的”,作副词时表示“很好;不错”,但不常用于修饰动词。

B 选项“well”作副词时可表示“好;令人满意地”,能修饰“remember”,所以选B。

2. I find it hard to remember the words. I think making ____ is a good way.A. storiesB. sentencesC. friendsD. plans答案:B。

本题考查词汇记忆方法。

“make sentences”表示“造句”,通过造句能更好地记住单词。

A 选项“stories”是“故事”,C 选项“friends”是“朋友”,D 选项“plans”是“计划”,都不如“造句”对记忆单词有直接帮助,所以选B。

3. When I try to remember words, I often ____ them many times.A. seeB. lookC. readD. watch答案:C。

本题考查“看”相关的词汇用法。

“read”有“阅读;朗读”的意思,“read words”表示“读单词”,能帮助记忆。

A 选项“see”强调“看到”的结果,B 选项“look”强调“看”的动作,且是不及物动词,需与介词搭配,D 选项“watch”常表示“观看( 比赛、电视等)”,都不符合“记忆单词时的动作”这一语境,所以选C。

4. To remember English words better, I write them on pieces of paper and ____ them often.A. look atB. look forC. look afterD. look up答案:A。

全新版大学英语第三版课后习题答案

全新版大学英语第三版课后习题答案

UNIT 1VocabularyI.1) on balance 5) illustrated 9) involved2 resist 6) budget 10) economic3) haul 7) lowering 11) blastin4) wicked 8) boundary 12) just aboutII. Translation1. 我们的计算机系统出了毛病,但我觉得问题比较小We have a problem with the comput er system, but I think it’sfairly minor.2. 父亲去世时我还小,不能独立生活。

就在那时,家乡的父老接过了养育我(my upbringing)的责任。

(at that point)My father died when I was too young to live on my own. The people of my hometown took over (responsibility for) my upbringing at that point.3. 这些玩具必得在达到严格的安全要求后才可出售给儿童。

(requirement) The toys have to meet strict/ tough safety requirements before they can be sold to children.4. 作为新闻和舆论的载体(carrier),广播和电视补充了而不是替代了报纸。

(supplement,rather than)Radio and television have supplemented rather than replaced the newspaper as carriers of news and opinion.5. 至于这本杂志,它刊载世界各地许多报纸杂志上文章的摘要。

全新版大学英语第三版课后习题答案

全新版大学英语第三版课后习题答案

UNIT 1VocabularyI.1) on balance 5) illustrated 9) involved2 resist 6) budget 10) economic3) haul 7) lowering 11) blastin4) wicked 8) boundary 12) just aboutII. Translation1. 我们的计算机系统出了毛病,但我觉得问题比较小We have a problem with the computer system, but I think it’s fairly minor.2. 父亲去世时我还小,不能独立生活。

就在那时,家乡的父老接过了养育我(my upbringing)的责任。

(at that point)My father died when I was too young to live on my own. The people of my hometown took over (responsibility for) my upbringing at that point.3. 这些玩具必得在达到严格的安全要求后才可出售给儿童。

(requirement)The toys have to meet strict/ tough safety requirements before they can be sold to children.4. 作为新闻和舆论的载体(carrier),广播和电视补充了而不是替代了报纸。

(supplement,rather than)Radio and television have supplemented rather than replaced the newspaper as carriers of news and opinion.5. 至于这本杂志,它刊载世界各地许多报纸杂志上文章的摘要。

PEPEC900句教学方法探讨

PEPEC900句教学方法探讨

ENGLISH ON CAMPUS2022年19期总第615期PEPEC900句教学方法探讨摘 要:PEPEC900句复诵部分是飞行学员通过ICAO考试的一大障碍。

笔者经过对多年教学实践的反思,在理解句意、大声朗读、反复操练的基础上,提出了速记法和分类总结记忆法,旨在提高飞行学生900句学习的效率,从而更加顺利地通过考试。

关键词:PEPEC;900句;教学方法作者简介:孙文娟,中国民航飞行学院洛阳分院。

PEPEC900句对中国民航飞行人员和民航院校的飞行学员来说至关重要,900句部分的表现情况直接关系其ICAO 考试能否通过。

因此,各大飞行院校都极其重视900句的教学和训练。

笔者多年来一直从事飞行英语的教学工作,本文拟对900句的教学方法进行一些思考和探讨。

一、PEPEC900句简介PEPEC900句的文本和录音是提前公布的,考试时根据测试等级随机抽取2-4组句子,每组4个句子,要求考生听句子的录音进行复诵。

这一部分的评分标准也是比较严格的。

前8个句子是2级或3级的难度,考生复诵准确率必须100%才判定为“正确”。

9-12句为4级难度,12-20句为5级难度,考生复诵准确率在90%以上可判定为“正确”, 复诵准确率在60%-90%之间判定为“部分正确”, 复诵准确率低于60%则判定为“错误”。

评分系统设定每个级别句子的复诵正确率要达到75%才能达到相应级别要求。

认知心理学认为人的短时记忆容量是7+2或7-2,也就是说,人的短时记忆就是7词汇左右。

900句的句子长度由2个词到43个词不等,平均句长为12.12个词,这已经超出了人的短时记忆极限。

所以,900句测试不单是考查语言能力,更考查记忆能力。

学生们普遍反馈,900句最难。

针对这一现象,笔者对PEPEC900句的教学方法进行了探索。

二、PEPEC900句教学方法探讨(一)通读句子—找出生词—理清句意一定要确保每一句话里面的每一个词都认识、都会读,每一句话的意思都能够完全理解。

Unit3 Grammar课件2024-2025学年牛津译林版英语九年级上册

Unit3 Grammar课件2024-2025学年牛津译林版英语九年级上册
What has happened to him? We don’t know. (合并成一句) _W_e__d_o_n_’_t _k_n_o_w__w_h_a_t_h_a_s__h_a_p_p_e_n_e_d__t_o_h_i_m_.__.
练一练:
I’d like to know … Where is your school? _I_’d__li_k_e_t_o_k_n_o__w_w__h_e_r_e_y_o_u_r_s_c_h__o_o_l _is_.____
3.I am not sure _w_h_ic_h__m_e_th_o_d__I_s_h_o_u_ld__u_se__t_o__
_so_l_ve__t_h_e_p_r_o_b_le_m___.
4.Can you tell me w_h_e_r_e__w_e_c_a_n_b_u_y__a_g_o_o_d_____
I like The Voice of China a lot. I want to take part in it. I spend so much time practising singing that I hardly have time for my schoolwork. I don’t know how I can achieve a balance between singing and my schoolwork.
The singer Na Ying is one of the four coaches in the Voice of China. I’d like to ask her what I should do to take part in the program. Help me write a letter to her.

answer

answer

Computer Systems:A Programmer’s PerspectiveInstructor’s Solution Manual1Randal E.BryantDavid R.O’HallaronDecember4,20031Copyright c2003,R.E.Bryant,D.R.O’Hallaron.All rights reserved.2Chapter1Solutions to Homework ProblemsThe text uses two different kinds of exercises:Practice Problems.These are problems that are incorporated directly into the text,with explanatory solutions at the end of each chapter.Our intention is that students will work on these problems as they read the book.Each one highlights some particular concept.Homework Problems.These are found at the end of each chapter.They vary in complexity from simple drills to multi-week labs and are designed for instructors to give as assignments or to use as recitation examples.This document gives the solutions to the homework problems.1.1Chapter1:A Tour of Computer Systems1.2Chapter2:Representing and Manipulating InformationProblem2.40Solution:This exercise should be a straightforward variation on the existing code.2CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS1011void show_double(double x)12{13show_bytes((byte_pointer)&x,sizeof(double));14}code/data/show-ans.c 1int is_little_endian(void)2{3/*MSB=0,LSB=1*/4int x=1;56/*Return MSB when big-endian,LSB when little-endian*/7return(int)(*(char*)&x);8}1.2.CHAPTER2:REPRESENTING AND MANIPULATING INFORMATION3 There are many solutions to this problem,but it is a little bit tricky to write one that works for any word size.Here is our solution:code/data/shift-ans.c The above code peforms a right shift of a word in which all bits are set to1.If the shift is arithmetic,the resulting word will still have all bits set to1.Problem2.45Solution:This problem illustrates some of the challenges of writing portable code.The fact that1<<32yields0on some32-bit machines and1on others is common source of bugs.A.The C standard does not define the effect of a shift by32of a32-bit datum.On the SPARC(andmany other machines),the expression x<<k shifts by,i.e.,it ignores all but the least significant5bits of the shift amount.Thus,the expression1<<32yields1.pute beyond_msb as2<<31.C.We cannot shift by more than15bits at a time,but we can compose multiple shifts to get thedesired effect.Thus,we can compute set_msb as2<<15<<15,and beyond_msb as set_msb<<1.Problem2.46Solution:This problem highlights the difference between zero extension and sign extension.It also provides an excuse to show an interesting trick that compilers often use to use shifting to perform masking and sign extension.A.The function does not perform any sign extension.For example,if we attempt to extract byte0fromword0xFF,we will get255,rather than.B.The following code uses a well-known trick for using shifts to isolate a particular range of bits and toperform sign extension at the same time.First,we perform a left shift so that the most significant bit of the desired byte is at bit position31.Then we right shift by24,moving the byte into the proper position and peforming sign extension at the same time.4CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 3int left=word<<((3-bytenum)<<3);4return left>>24;5}Problem2.48Solution:This problem lets students rework the proof that complement plus increment performs negation.We make use of the property that two’s complement addition is associative,commutative,and has additive ing C notation,if we define y to be x-1,then we have˜y+1equal to-y,and hence˜y equals -y+1.Substituting gives the expression-(x-1)+1,which equals-x.Problem2.49Solution:This problem requires a fairly deep understanding of two’s complement arithmetic.Some machines only provide one form of multiplication,and hence the trick shown in the code here is actually required to perform that actual form.As seen in Equation2.16we have.Thefinal term has no effect on the-bit representation of,but the middle term represents a correction factor that must be added to the high order bits.This is implemented as follows:code/data/uhp-ans.c Problem2.50Solution:Patterns of the kind shown here frequently appear in compiled code.1.2.CHAPTER2:REPRESENTING AND MANIPULATING INFORMATION5A.:x+(x<<2)B.:x+(x<<3)C.:(x<<4)-(x<<1)D.:(x<<3)-(x<<6)Problem2.51Solution:Bit patterns similar to these arise in many applications.Many programmers provide them directly in hex-adecimal,but it would be better if they could express them in more abstract ways.A..˜((1<<k)-1)B..((1<<k)-1)<<jProblem2.52Solution:Byte extraction and insertion code is useful in many contexts.Being able to write this sort of code is an important skill to foster.code/data/rbyte-ans.c Problem2.53Solution:These problems are fairly tricky.They require generating masks based on the shift amounts.Shift value k equal to0must be handled as a special case,since otherwise we would be generating the mask by performing a left shift by32.6CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 1unsigned srl(unsigned x,int k)2{3/*Perform shift arithmetically*/4unsigned xsra=(int)x>>k;5/*Make mask of low order32-k bits*/6unsigned mask=k?((1<<(32-k))-1):˜0;78return xsra&mask;9}code/data/rshift-ans.c 1int sra(int x,int k)2{3/*Perform shift logically*/4int xsrl=(unsigned)x>>k;5/*Make mask of high order k bits*/6unsigned mask=k?˜((1<<(32-k))-1):0;78return(x<0)?mask|xsrl:xsrl;9}.1.2.CHAPTER2:REPRESENTING AND MANIPULATING INFORMATION7B.(a)For,we have,,code/data/floatge-ans.c 1int float_ge(float x,float y)2{3unsigned ux=f2u(x);4unsigned uy=f2u(y);5unsigned sx=ux>>31;6unsigned sy=uy>>31;78return9(ux<<1==0&&uy<<1==0)||/*Both are zero*/10(!sx&&sy)||/*x>=0,y<0*/11(!sx&&!sy&&ux>=uy)||/*x>=0,y>=0*/12(sx&&sy&&ux<=uy);/*x<0,y<0*/13},8CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS This exercise is of practical value,since Intel-compatible processors perform all of their arithmetic in ex-tended precision.It is interesting to see how adding a few more bits to the exponent greatly increases the range of values that can be represented.Description Extended precisionValueSmallest denorm.Largest norm.Problem2.59Solution:We have found that working throughfloating point representations for small word sizes is very instructive. Problems such as this one help make the description of IEEEfloating point more concrete.Description8000Smallest value4700Largest denormalized———code/data/fpwr2-ans.c1.3.CHAPTER3:MACHINE LEVEL REPRESENTATION OF C PROGRAMS91/*Compute2**x*/2float fpwr2(int x){34unsigned exp,sig;5unsigned u;67if(x<-149){8/*Too small.Return0.0*/9exp=0;10sig=0;11}else if(x<-126){12/*Denormalized result*/13exp=0;14sig=1<<(x+149);15}else if(x<128){16/*Normalized result.*/17exp=x+127;18sig=0;19}else{20/*Too big.Return+oo*/21exp=255;22sig=0;23}24u=exp<<23|sig;25return u2f(u);26}10CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS int decode2(int x,int y,int z){int t1=y-z;int t2=x*t1;int t3=(t1<<31)>>31;int t4=t3ˆt2;return t4;}Problem3.32Solution:This code example demonstrates one of the pedagogical challenges of using a compiler to generate assembly code examples.Seemingly insignificant changes in the C code can yield very different results.Of course, students will have to contend with this property as work with machine-generated assembly code anyhow. They will need to be able to decipher many different code patterns.This problem encourages them to think in abstract terms about one such pattern.The following is an annotated version of the assembly code:1movl8(%ebp),%edx x2movl12(%ebp),%ecx y3movl%edx,%eax4subl%ecx,%eax result=x-y5cmpl%ecx,%edx Compare x:y6jge.L3if>=goto done:7movl%ecx,%eax8subl%edx,%eax result=y-x9.L3:done:A.When,it will computefirst and then.When it just computes.B.The code for then-statement gets executed unconditionally.It then jumps over the code for else-statement if the test is false.C.then-statementt=test-expr;if(t)goto done;else-statementdone:D.The code in then-statement must not have any side effects,other than to set variables that are also setin else-statement.1.3.CHAPTER3:MACHINE LEVEL REPRESENTATION OF C PROGRAMS11Problem3.33Solution:This problem requires students to reason about the code fragments that implement the different branches of a switch statement.For this code,it also requires understanding different forms of pointer dereferencing.A.In line29,register%edx is copied to register%eax as the return value.From this,we can infer that%edx holds result.B.The original C code for the function is as follows:1/*Enumerated type creates set of constants numbered0and upward*/2typedef enum{MODE_A,MODE_B,MODE_C,MODE_D,MODE_E}mode_t;34int switch3(int*p1,int*p2,mode_t action)5{6int result=0;7switch(action){8case MODE_A:9result=*p1;10*p1=*p2;11break;12case MODE_B:13*p2+=*p1;14result=*p2;15break;16case MODE_C:17*p2=15;18result=*p1;19break;20case MODE_D:21*p2=*p1;22/*Fall Through*/23case MODE_E:24result=17;25break;26default:27result=-1;28}29return result;30}Problem3.34Solution:This problem gives students practice analyzing disassembled code.The switch statement contains all the features one can imagine—cases with multiple labels,holes in the range of possible case values,and cases that fall through.12CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 1int switch_prob(int x)2{3int result=x;45switch(x){6case50:7case52:8result<<=2;9break;10case53:11result>>=2;12break;13case54:14result*=3;15/*Fall through*/16case55:17result*=result;18/*Fall through*/19default:20result+=10;21}2223return result;24}code/asm/varprod-ans.c 1int var_prod_ele_opt(var_matrix A,var_matrix B,int i,int k,int n) 2{3int*Aptr=&A[i*n];4int*Bptr=&B[k];5int result=0;6int cnt=n;78if(n<=0)9return result;1011do{12result+=(*Aptr)*(*Bptr);13Aptr+=1;14Bptr+=n;15cnt--;1.3.CHAPTER3:MACHINE LEVEL REPRESENTATION OF C PROGRAMS13 16}while(cnt);1718return result;19}code/asm/structprob-ans.c 1typedef struct{2int idx;3int x[4];4}a_struct;14CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 1/*Read input line and write it back*/2/*Code will work for any buffer size.Bigger is more time-efficient*/ 3#define BUFSIZE644void good_echo()5{6char buf[BUFSIZE];7int i;8while(1){9if(!fgets(buf,BUFSIZE,stdin))10return;/*End of file or error*/11/*Print characters in buffer*/12for(i=0;buf[i]&&buf[i]!=’\n’;i++)13if(putchar(buf[i])==EOF)14return;/*Error*/15if(buf[i]==’\n’){16/*Reached terminating newline*/17putchar(’\n’);18return;19}20}21}An alternative implementation is to use getchar to read the characters one at a time.Problem3.38Solution:Successfully mounting a buffer overflow attack requires understanding many aspects of machine-level pro-grams.It is quite intriguing that by supplying a string to one function,we can alter the behavior of another function that should always return afixed value.In assigning this problem,you should also give students a stern lecture about ethical computing practices and dispell any notion that hacking into systems is a desirable or even acceptable thing to do.Our solution starts by disassembling bufbomb,giving the following code for getbuf: 1080484f4<getbuf>:280484f4:55push%ebp380484f5:89e5mov%esp,%ebp480484f7:83ec18sub$0x18,%esp580484fa:83c4f4add$0xfffffff4,%esp680484fd:8d45f4lea0xfffffff4(%ebp),%eax78048500:50push%eax88048501:e86a ff ff ff call8048470<getxs>98048506:b801000000mov$0x1,%eax10804850b:89ec mov%ebp,%esp11804850d:5d pop%ebp12804850e:c3ret13804850f:90nopWe can see on line6that the address of buf is12bytes below the saved value of%ebp,which is4bytes below the return address.Our strategy then is to push a string that contains12bytes of code,the saved value1.3.CHAPTER3:MACHINE LEVEL REPRESENTATION OF C PROGRAMS15 of%ebp,and the address of the start of the buffer.To determine the relevant values,we run GDB as follows:1.First,we set a breakpoint in getbuf and run the program to that point:(gdb)break getbuf(gdb)runComparing the stopping point to the disassembly,we see that it has already set up the stack frame.2.We get the value of buf by computing a value relative to%ebp:(gdb)print/x(%ebp+12)This gives0xbfffefbc.3.Wefind the saved value of register%ebp by dereferencing the current value of this register:(gdb)print/x*$ebpThis gives0xbfffefe8.4.Wefind the value of the return pointer on the stack,at offset4relative to%ebp:(gdb)print/x*((int*)$ebp+1)This gives0x8048528We can now put this information together to generate assembly code for our attack:1pushl$0x8048528Put correct return pointer back on stack2movl$0xdeadbeef,%eax Alter return value3ret Re-execute return4.align4Round up to125.long0xbfffefe8Saved value of%ebp6.long0xbfffefbc Location of buf7.long0x00000000PaddingNote that we have used the.align statement to get the assembler to insert enough extra bytes to use up twelve bytes for the code.We added an extra4bytes of0s at the end,because in some cases OBJDUMP would not generate the complete byte pattern for the data.These extra bytes(plus the termininating null byte)will overflow into the stack frame for test,but they will not affect the program behavior. Assembling this code and disassembling the object code gives us the following:10:6828850408push$0x804852825:b8ef be ad de mov$0xdeadbeef,%eax3a:c3ret4b:90nop Byte inserted for alignment.5c:e8ef ff bf bc call0xbcc00000Invalid disassembly.611:ef out%eax,(%dx)Trying to diassemble712:ff(bad)data813:bf00000000mov$0x0,%edi16CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS From this we can read off the byte sequence:6828850408b8ef be ad de c390e8ef ff bf bc ef ff bf00000000Problem3.39Solution:This problem is a variant on the asm examples in the text.The code is actually fairly simple.It relies on the fact that asm outputs can be arbitrary lvalues,and hence we can use dest[0]and dest[1]directly in the output list.code/asm/asmprobs-ans.c Problem3.40Solution:For this example,students essentially have to write the entire function in assembly.There is no(apparent) way to interface between thefloating point registers and the C code using extended asm.code/asm/fscale.c1.4.CHAPTER4:PROCESSOR ARCHITECTURE17 1.4Chapter4:Processor ArchitectureProblem4.32Solution:This problem makes students carefully examine the tables showing the computation stages for the different instructions.The steps for iaddl are a hybrid of those for irmovl and OPl.StageFetchrA:rB M PCvalP PCExecuteR rB valEPC updateleaveicode:ifun M PCDecodevalB RvalE valBMemoryWrite backR valMPC valPProblem4.34Solution:The following HCL code includes implementations of both the iaddl instruction and the leave instruc-tions.The implementations are fairly straightforward given the computation steps listed in the solutions to problems4.32and4.33.You can test the solutions using the test code in the ptest subdirectory.Make sure you use command line argument‘-i.’18CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 1####################################################################2#HCL Description of Control for Single Cycle Y86Processor SEQ#3#Copyright(C)Randal E.Bryant,David R.O’Hallaron,2002#4####################################################################56##This is the solution for the iaddl and leave problems78####################################################################9#C Include’s.Don’t alter these#10#################################################################### 1112quote’#include<stdio.h>’13quote’#include"isa.h"’14quote’#include"sim.h"’15quote’int sim_main(int argc,char*argv[]);’16quote’int gen_pc(){return0;}’17quote’int main(int argc,char*argv[])’18quote’{plusmode=0;return sim_main(argc,argv);}’1920####################################################################21#Declarations.Do not change/remove/delete any of these#22#################################################################### 2324#####Symbolic representation of Y86Instruction Codes#############25intsig INOP’I_NOP’26intsig IHALT’I_HALT’27intsig IRRMOVL’I_RRMOVL’28intsig IIRMOVL’I_IRMOVL’29intsig IRMMOVL’I_RMMOVL’30intsig IMRMOVL’I_MRMOVL’31intsig IOPL’I_ALU’32intsig IJXX’I_JMP’33intsig ICALL’I_CALL’34intsig IRET’I_RET’35intsig IPUSHL’I_PUSHL’36intsig IPOPL’I_POPL’37#Instruction code for iaddl instruction38intsig IIADDL’I_IADDL’39#Instruction code for leave instruction40intsig ILEAVE’I_LEAVE’4142#####Symbolic representation of Y86Registers referenced explicitly##### 43intsig RESP’REG_ESP’#Stack Pointer44intsig REBP’REG_EBP’#Frame Pointer45intsig RNONE’REG_NONE’#Special value indicating"no register"4647#####ALU Functions referenced explicitly##### 48intsig ALUADD’A_ADD’#ALU should add its arguments4950#####Signals that can be referenced by control logic####################1.4.CHAPTER4:PROCESSOR ARCHITECTURE195152#####Fetch stage inputs#####53intsig pc’pc’#Program counter54#####Fetch stage computations#####55intsig icode’icode’#Instruction control code56intsig ifun’ifun’#Instruction function57intsig rA’ra’#rA field from instruction58intsig rB’rb’#rB field from instruction59intsig valC’valc’#Constant from instruction60intsig valP’valp’#Address of following instruction 6162#####Decode stage computations#####63intsig valA’vala’#Value from register A port64intsig valB’valb’#Value from register B port 6566#####Execute stage computations#####67intsig valE’vale’#Value computed by ALU68boolsig Bch’bcond’#Branch test6970#####Memory stage computations#####71intsig valM’valm’#Value read from memory727374####################################################################75#Control Signal Definitions.#76#################################################################### 7778################Fetch Stage################################### 7980#Does fetched instruction require a regid byte?81bool need_regids=82icode in{IRRMOVL,IOPL,IPUSHL,IPOPL,83IIADDL,84IIRMOVL,IRMMOVL,IMRMOVL};8586#Does fetched instruction require a constant word?87bool need_valC=88icode in{IIRMOVL,IRMMOVL,IMRMOVL,IJXX,ICALL,IIADDL};8990bool instr_valid=icode in91{INOP,IHALT,IRRMOVL,IIRMOVL,IRMMOVL,IMRMOVL,92IIADDL,ILEAVE,93IOPL,IJXX,ICALL,IRET,IPUSHL,IPOPL};9495################Decode Stage################################### 9697##What register should be used as the A source?98int srcA=[99icode in{IRRMOVL,IRMMOVL,IOPL,IPUSHL}:rA;20CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 101icode in{IPOPL,IRET}:RESP;1021:RNONE;#Don’t need register103];104105##What register should be used as the B source?106int srcB=[107icode in{IOPL,IRMMOVL,IMRMOVL}:rB;108icode in{IIADDL}:rB;109icode in{IPUSHL,IPOPL,ICALL,IRET}:RESP;110icode in{ILEAVE}:REBP;1111:RNONE;#Don’t need register112];113114##What register should be used as the E destination?115int dstE=[116icode in{IRRMOVL,IIRMOVL,IOPL}:rB;117icode in{IIADDL}:rB;118icode in{IPUSHL,IPOPL,ICALL,IRET}:RESP;119icode in{ILEAVE}:RESP;1201:RNONE;#Don’t need register121];122123##What register should be used as the M destination?124int dstM=[125icode in{IMRMOVL,IPOPL}:rA;126icode in{ILEAVE}:REBP;1271:RNONE;#Don’t need register128];129130################Execute Stage###################################131132##Select input A to ALU133int aluA=[134icode in{IRRMOVL,IOPL}:valA;135icode in{IIRMOVL,IRMMOVL,IMRMOVL}:valC;136icode in{IIADDL}:valC;137icode in{ICALL,IPUSHL}:-4;138icode in{IRET,IPOPL}:4;139icode in{ILEAVE}:4;140#Other instructions don’t need ALU141];142143##Select input B to ALU144int aluB=[145icode in{IRMMOVL,IMRMOVL,IOPL,ICALL,146IPUSHL,IRET,IPOPL}:valB;147icode in{IIADDL,ILEAVE}:valB;148icode in{IRRMOVL,IIRMOVL}:0;149#Other instructions don’t need ALU1.4.CHAPTER4:PROCESSOR ARCHITECTURE21151152##Set the ALU function153int alufun=[154icode==IOPL:ifun;1551:ALUADD;156];157158##Should the condition codes be updated?159bool set_cc=icode in{IOPL,IIADDL};160161################Memory Stage###################################162163##Set read control signal164bool mem_read=icode in{IMRMOVL,IPOPL,IRET,ILEAVE};165166##Set write control signal167bool mem_write=icode in{IRMMOVL,IPUSHL,ICALL};168169##Select memory address170int mem_addr=[171icode in{IRMMOVL,IPUSHL,ICALL,IMRMOVL}:valE;172icode in{IPOPL,IRET}:valA;173icode in{ILEAVE}:valA;174#Other instructions don’t need address175];176177##Select memory input data178int mem_data=[179#Value from register180icode in{IRMMOVL,IPUSHL}:valA;181#Return PC182icode==ICALL:valP;183#Default:Don’t write anything184];185186################Program Counter Update############################187188##What address should instruction be fetched at189190int new_pc=[191#e instruction constant192icode==ICALL:valC;193#Taken e instruction constant194icode==IJXX&&Bch:valC;195#Completion of RET e value from stack196icode==IRET:valM;197#Default:Use incremented PC1981:valP;199];22CHAPTER 1.SOLUTIONS TO HOMEWORK PROBLEMSME DMispredictE DM E DM M E D E DMGen./use 1W E DM Gen./use 2WE DM Gen./use 3W Figure 1.1:Pipeline states for special control conditions.The pairs connected by arrows can arisesimultaneously.code/arch/pipe-nobypass-ans.hcl1.4.CHAPTER4:PROCESSOR ARCHITECTURE232#At most one of these can be true.3bool F_bubble=0;4bool F_stall=5#Stall if either operand source is destination of6#instruction in execute,memory,or write-back stages7d_srcA!=RNONE&&d_srcA in8{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE}||9d_srcB!=RNONE&&d_srcB in10{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE}||11#Stalling at fetch while ret passes through pipeline12IRET in{D_icode,E_icode,M_icode};1314#Should I stall or inject a bubble into Pipeline Register D?15#At most one of these can be true.16bool D_stall=17#Stall if either operand source is destination of18#instruction in execute,memory,or write-back stages19#but not part of mispredicted branch20!(E_icode==IJXX&&!e_Bch)&&21(d_srcA!=RNONE&&d_srcA in22{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE}||23d_srcB!=RNONE&&d_srcB in24{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE});2526bool D_bubble=27#Mispredicted branch28(E_icode==IJXX&&!e_Bch)||29#Stalling at fetch while ret passes through pipeline30!(E_icode in{IMRMOVL,IPOPL}&&E_dstM in{d_srcA,d_srcB})&&31#but not condition for a generate/use hazard32!(d_srcA!=RNONE&&d_srcA in33{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE}||34d_srcB!=RNONE&&d_srcB in35{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE})&&36IRET in{D_icode,E_icode,M_icode};3738#Should I stall or inject a bubble into Pipeline Register E?39#At most one of these can be true.40bool E_stall=0;41bool E_bubble=42#Mispredicted branch43(E_icode==IJXX&&!e_Bch)||44#Inject bubble if either operand source is destination of45#instruction in execute,memory,or write back stages46d_srcA!=RNONE&&47d_srcA in{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE}|| 48d_srcB!=RNONE&&49d_srcB in{E_dstM,E_dstE,M_dstM,M_dstE,W_dstM,W_dstE};5024CHAPTER1.SOLUTIONS TO HOMEWORK PROBLEMS 52#At most one of these can be true.53bool M_stall=0;54bool M_bubble=0;code/arch/pipe-full-ans.hcl 1####################################################################2#HCL Description of Control for Pipelined Y86Processor#3#Copyright(C)Randal E.Bryant,David R.O’Hallaron,2002#4####################################################################56##This is the solution for the iaddl and leave problems78####################################################################9#C Include’s.Don’t alter these#10#################################################################### 1112quote’#include<stdio.h>’13quote’#include"isa.h"’14quote’#include"pipeline.h"’15quote’#include"stages.h"’16quote’#include"sim.h"’17quote’int sim_main(int argc,char*argv[]);’18quote’int main(int argc,char*argv[]){return sim_main(argc,argv);}’1920####################################################################21#Declarations.Do not change/remove/delete any of these#22#################################################################### 2324#####Symbolic representation of Y86Instruction Codes#############25intsig INOP’I_NOP’26intsig IHALT’I_HALT’27intsig IRRMOVL’I_RRMOVL’28intsig IIRMOVL’I_IRMOVL’29intsig IRMMOVL’I_RMMOVL’30intsig IMRMOVL’I_MRMOVL’31intsig IOPL’I_ALU’32intsig IJXX’I_JMP’33intsig ICALL’I_CALL’34intsig IRET’I_RET’1.4.CHAPTER4:PROCESSOR ARCHITECTURE25 36intsig IPOPL’I_POPL’37#Instruction code for iaddl instruction38intsig IIADDL’I_IADDL’39#Instruction code for leave instruction40intsig ILEAVE’I_LEAVE’4142#####Symbolic representation of Y86Registers referenced explicitly##### 43intsig RESP’REG_ESP’#Stack Pointer44intsig REBP’REG_EBP’#Frame Pointer45intsig RNONE’REG_NONE’#Special value indicating"no register"4647#####ALU Functions referenced explicitly##########################48intsig ALUADD’A_ADD’#ALU should add its arguments4950#####Signals that can be referenced by control logic##############5152#####Pipeline Register F##########################################5354intsig F_predPC’pc_curr->pc’#Predicted value of PC5556#####Intermediate Values in Fetch Stage###########################5758intsig f_icode’if_id_next->icode’#Fetched instruction code59intsig f_ifun’if_id_next->ifun’#Fetched instruction function60intsig f_valC’if_id_next->valc’#Constant data of fetched instruction 61intsig f_valP’if_id_next->valp’#Address of following instruction 6263#####Pipeline Register D##########################################64intsig D_icode’if_id_curr->icode’#Instruction code65intsig D_rA’if_id_curr->ra’#rA field from instruction66intsig D_rB’if_id_curr->rb’#rB field from instruction67intsig D_valP’if_id_curr->valp’#Incremented PC6869#####Intermediate Values in Decode Stage#########################7071intsig d_srcA’id_ex_next->srca’#srcA from decoded instruction72intsig d_srcB’id_ex_next->srcb’#srcB from decoded instruction73intsig d_rvalA’d_regvala’#valA read from register file74intsig d_rvalB’d_regvalb’#valB read from register file 7576#####Pipeline Register E##########################################77intsig E_icode’id_ex_curr->icode’#Instruction code78intsig E_ifun’id_ex_curr->ifun’#Instruction function79intsig E_valC’id_ex_curr->valc’#Constant data80intsig E_srcA’id_ex_curr->srca’#Source A register ID81intsig E_valA’id_ex_curr->vala’#Source A value82intsig E_srcB’id_ex_curr->srcb’#Source B register ID83intsig E_valB’id_ex_curr->valb’#Source B value84intsig E_dstE’id_ex_curr->deste’#Destination E register ID。

外研版七年级上册Module7 知识点+习题(含答案)

外研版七年级上册Module7 知识点+习题(含答案)

第7讲Computers学习目标一、熟练掌握重点单词、词组的用法;二、熟练掌握一般现在时的特殊疑问句的用法;三、会做对划线部分提问;四、对句型变化掌握更加熟练;五、理解并运用关于电脑的介绍。

知识串烧单词1、keyboard ['ki:,bɔ:d] 键盘2、mouse [maʊs] 鼠标;老鼠3、screen [skri:n] 屏幕4、connect [kə'nekt] 连接5、turn [tɜːn] 转动6、turn on 打开7、learn [lɜːn] 学;学习8、document ['dɒkjʊmənt] 文件9、click [klɪk] 点击10、use [juːz] 使用11、save [seɪv] 保存;储存12、box [bɒks] 框;盒子13、finally ['faɪnəlɪ] 最后14、print [prɪnt] 打印15、paper ['peɪpə] 纸16、share [ʃeə] 共用、分享17、Australia [ɒs'treɪlɪə] 澳大利亚18、company ['kʌmpənɪ] 公司;剧团19、often ['ɒfən] 经常20、customer ['kʌstəmə] 顾客21、internet ['ɪntənet] 因特网22、check [tʃek] 检查、查看23、train [treɪn] 火车24、travel ['trævl] 旅行25、plan [plæn] n.计划26、v.计划;打算27、ticket ['tɪkɪt] 票28、music ['mjuːzɪk] 音乐29、movie ['muːvɪ] 电影30、night [naɪt] 夜晚31、search [sɜːtʃ] 搜寻;搜索;查找32、information [ɪnfə'meɪʃn] 信息33、email ['iːmeɪl] 电子邮件34、send [send] 发送35、game [geɪm] 游戏36、sometimes ['sʌmtaɪmz] 有时候;不时37、cinema ['sɪnɪmə] 电影院38、clothes [kləʊðz] 衣服(总称)39、visit ['vɪzɪt] 探望;参观40、holiday ['hɒlɪdeɪ] 假日;节日课文U1 How do I write my homework on the computer? Linging: How do I write my homework on the computer? Can I learn?Betty: Sure! First, open a new document. Click the mouse on "new document". Linging: What's the mouse? Is this it?Betty: Yes.Linging: Where do I click on "new document"?Betty: On the left of the screen... there!Linging: OK, what's next?Betty: Next, you write your homework in the new document. Use the keyboard.Linging: What do I do next? How do I save the document?Betty: You click "save", and write a name for it.Linging: Where do I write the name?Betty: Write it in the box. OK, then click "save" again.Linging: OK. Finally, how do I print my document?Betty: Click "print" and "OK".Linging: What about some paper?Betty: Oh yes, of course! You put the paper in there first!U2 When do you use a computer?There is a computer in my home, and my father and I shares it. My father is a manager of a company, so he often talks to his customers on the computer. He also goes on the Internet to check the times of trains, make travel plans, and buy tickets. I listen to music or watch movies on it every Friday night. – JackThere is no computer in my home. I can only use it at school. On the Internet, I search for information, do my homework and check my email. I have a friend in Australia.I can see her and talk to her on the Internet. – AliceWe have a computer at home. My parents don't use it. I can use it on Sundays. I send email to my friends and play computer games. But sometimes I play a lot of games and my mother doesn't like it. -- Mike语法一、一般现在时的特殊疑问句A.定义:以特殊疑问词开头,对句中某一成分提问的句子叫特殊疑问句。

外研版九年级英语上册Module 4 Unit 1(含音频)

外研版九年级英语上册Module 4 Unit 1(含音频)

— Sam likes English best. He reads the texts
every day.
— __________.
A. So does Jack
B. So Jack does
C. So Jack is
D. So is Jack
2. Your train is about to leave. 您的火车要开了。 be about to do sth. 即将/正要做某事,表示 即将发生的动作,在时间上指最近的将来。
when you get home.
4 Listen and read.
Mum: Now, wh拉at萨’s our train number?月台;站台 Dad: T27 to Lhasa. It’s leaving from Platform 2.
Mum: The meeting in Lhasa is very important for us, but I’m sorry yomuicsasn未’t出co席m;e w未it出h u现s, Betty.
_s_h_e_i_s_i_n_a_n_d__lo_c_k__t_h_e_d_o_o_r__w_h_e_n__sh__e_g_o_e_s_o_u_t_ _/e_a_t_p__le_n_t_y_o_f_f_r_e_s_h_f_r_u_it__a_n_d_v_e_g_e_t_a_b_l_es______.
1.Be especially careful with the _d_o_o_r_. _S_h_u_t_ it when you are in and _l_o_ck__ it when you go out.
2.Make sure you eat plenty of fresh _f_r_u_i_t _ and _v_e_g_et_a_b_l_e_s. And I’ve left lots of your favorite _b_i_s_c_u_it_s__.

必修2Unit3 Computers

必修2Unit3 Computers

using intelligence is what I'm all about!
• 不管怎样,在我过目不忘的电子脑的 帮助下,运用智能就是我的一切!
返回目录
Unit 3 Computers
• 5.Anyhow, my goal is to provide humans wiotfhhiaghliqfeua_lit_y______________.
Unit 3 Computers
• Ⅲ.佳句再现
• 1.I developed very slowly and it took nearly
基 two hubnedforreed years _________I was built as an
础 自
analytical machine by Charles Babbage.
intelligent
理 →___________n.技术;技能
• 3.rea_lit_y_________n.智力;聪rea明lize;智能
→ap_p_rlie_caa_lti_o_n _____adj.智r能eall的y ;聪明ap的ply • 4._______a_ppnl.ican真t 实;现实;事实
• 4.结果
wit_h_th_e_h_e_lp_o_f ____________
• 5.毕竟,终究 g_o_b_y_________________
• 6.监视,看守 ____________________
• 7.在……的帮助下 ____________________
• 8.经过
_________________返_回_目_录
基 础
• 不管怎样,我的目标是给人类提供高 质量的生活。

七年级英语时态运用单选题30题

七年级英语时态运用单选题30题

七年级英语时态运用单选题30题1. We ______ English classes every day.A. haveB. hasC. havingD. had答案:A。

一般现在时中,主语是we,非第三人称单数,动词用原形have。

B 选项has 用于第三人称单数;C 选项having 是现在分词形式,不能直接作谓语;D 选项had 是过去式,不符合一般现在时。

2. Mary ______ her homework in the evening.A. doB. doesC. doingD. is doing答案:B。

主语Mary 是第三人称单数,一般现在时中动词用does。

A 选项do 用于非第三人称单数;C 选项doing 是现在分词形式,不能单独作谓语;D 选项is doing 是现在进行时。

3. The students ______ to school by bus.A. goB. goesC. going答案:A。

主语the students 是复数,一般现在时动词用原形go。

B 选项goes 用于第三人称单数;C 选项going 是现在分词形式,不能作谓语;D 选项went 是过去式。

4. My father ______ TV every night.A. watchB. watchesC. watchingD. watched答案:B。

主语my father 是第三人称单数,一般现在时动词用watches。

A 选项watch 用于非第三人称单数;C 选项watching 是现在分词形式,不能作谓语;D 选项watched 是过去式。

5. They ______ football on the playground on Sundays.A. playB. playsC. playingD. played答案:A。

主语they 是复数,一般现在时动词用原形play。

B 选项plays 用于第三人称单数;C 选项playing 是现在分词形式,不能作谓语;D 选项played 是过去式。

电脑的问题英语作文

电脑的问题英语作文

电脑的问题英语作文Computer Problems。

Nowadays, computers have become an indispensable part of our daily lives. We use them for work, entertainment, communication, and so much more. However, just like any other machine, computers can encounter problems from time to time. In this essay, we will discuss some common computer problems and their possible solutions.One of the most common computer problems is a slow performance. This can be caused by a variety of factors, such as too many programs running at the same time, a lack of memory or storage space, or even a virus or malware infection. To address this issue, you can start by closing any unnecessary programs and freeing up some space on your hard drive. You can also run a virus scan to check for any malicious software that may be causing the slowdown.Another common problem is a computer that won't startup. This can be a very frustrating issue, especially if you rely on your computer for work or school. There are several possible causes for this problem, including a faulty power supply, a malfunctioning hardware component, or a corrupted operating system. To troubleshoot this issue, you can start by checking the power supply and making sure that all the cables are securely connected. If that doesn't solve the problem, you may need to seek professional help to diagnose and repair the issue.Viruses and malware are also a major concern for computer users. These malicious programs can cause a wide range of problems, including data loss, identity theft, and system instability. To protect your computer from these threats, it's important to install and regularly update a reliable antivirus program. You should also be cautious when downloading files or clicking on links from unknown sources, as these are common ways for viruses and malware to infiltrate your system.Hardware failures are another common issue that computer users may encounter. This can include problemswith the hard drive, memory, motherboard, or other components. If you suspect that your computer's hardware is failing, it's important to back up your data as soon as possible and seek professional assistance to diagnose and repair the issue.In addition to these common problems, there are many other issues that can arise with computers, such asinternet connectivity issues, software compatibility problems, and more. While some of these issues can be resolved with basic troubleshooting steps, others may require the expertise of a professional technician.In conclusion, computer problems are a common occurrence in today's digital age. While these issues can be frustrating, there are often solutions available to address them. By staying informed about common computer problems and taking proactive steps to protect and maintain your system, you can minimize the impact of these issues and keep your computer running smoothly.。

使用电脑时遇到的问题与解决英语作文

使用电脑时遇到的问题与解决英语作文

使用电脑时遇到的问题与解决英语作文Problems and Solutions Encountered While Using a ComputerIn today's digital age, computers have become an indispensable part of our daily lives. Whether it's for work, study, or entertainment, computers play a crucial role. However, using a computer is not always smooth sailing, and we often encounter various problems. Here, I will discuss some common issues I have faced while using a computer and the solutions I have found.One of the most common problems I have encountered is a slow-running computer. This can be extremely frustrating, especially when I am working on a tight schedule or playing a game. The solution to this issue often lies in optimizing the computer's performance. I have found that regularly clearing out unnecessary files and programs, as well as running a disk cleanup, can significantly improve the speed of my computer. Additionally, updating the operating system and drivers to the latest versions can also help enhance performance.Another issue I have faced is computer crashes or unexpected shutdowns. These can be caused by variousfactors, such as overheating, software conflicts, or hardware malfunctions. To address this problem, I have learned to monitor the temperature of my computer and ensure that it is properly ventilated. Additionally, I regularly back up my data to prevent any potential loss in case of a crash. If the crashes persist, I seek the help of a technician to identify and fix the underlying issue.Malware and viruses are also a significant concern when using a computer. These malicious programs can compromise the security of my data and affect the performance of my computer. To protect myself from such threats, I ensure that I have a reliable antivirus program installed on my computer. I also avoid clicking on suspicious links or downloading files from untrusted sources. Regularly updating my antivirus software and operating system also helps keep my computer secure.In conclusion, while using a computer, we often encounter various problems. However, with the right solutions and preventative measures, we can overcome these issues and ensure a smooth and enjoyable computing experience. Fromoptimizing performance to protecting against malware, there are many ways to troubleshoot and maintain our computers.。

have problems with sth造句简单

have problems with sth造句简单

have problems with sth造句简单1. I have problems with my computer, it keeps freezing.我电脑出问题了,老是卡住。

2. She has problems with public speaking, she gets very nervous.她在公众演讲方面有问题,她很紧张。

3. They have problems with their relationship, they argue all the time.他们的关系有问题,他们总是吵架。

4. He has problems with math, he finds it difficult to understand.他在数学方面有问题,他觉得很难理解。

5. She has problems with time management, she always runs late.她在时间管理方面有问题,她总是迟到。

6. They have problems with their car, it keeps breaking down.他们的车有问题,老是出故障。

7. He has problems with his health, he has been feeling unwell lately.他身体有问题,最近一直感觉不舒服。

8. She has problems with her boss, they don't get along.她和老板有问题,他们相处不好。

9. They have problems with their internet connection, it's been unreliable.他们的网络连接有问题,一直不稳定。

10. He has problems with his studies, he's struggling to keep up.他在学业方面有问题,他很难跟上。

帮助的英语作文

帮助的英语作文

帮助的英语作文有关帮助的英语作文(精选18篇)在平日的学习、工作和生活里,大家都有写作文的经历,对作文很是熟悉吧,作文一定要做到主题集中,围绕同一主题作深入阐述,切忌东拉西扯,主题涣散甚至无主题。

那么一般作文是怎么写的呢?以下是店铺为大家收集的有关帮助的英语作文,欢迎大家借鉴与参考,希望对大家有所帮助。

帮助的英语作文篇1As the economy develope,that evey desk in the office has a computer has not been a fresh thing.Nowdays,more and more officers use the computers. It seems that the computers play an improtant part of it.Firstly,people use computer programmes such as word,excel to type the documents and store the datas .Secondly,it helps us a lot to communicate with others.Because of it,we can get in touch with people in a matter of second even they are thousands distances away from us! Whats more,we can have a meeting togeter by using the computer.But what I have to mention is that we cant rely the computers too much.It sometimes also do harm to us.For example,many workers may be addicted to the computers during their work,which as result that they are not work hard enough.In addition,the computers also have radiation that is not good to our health.帮助的英语作文篇2Today is Sunday, I walk alone in the street, suddenly saw a grandmother crutches on the road crashed, a pair of red scarf Young Pioneers came over, helped the grandmother's waist, leaning on the grandmother had a road, slowly to I came here, Ivaguely heard the grandmother gratefully said; "Oh, thank you!" The juvenile team quickly said, "It does not matter, it does not matter, that's what we should do."I was touched by the sight of the front, the nose a little sour.I thought, I must go to the young pioneers to learn, learn his spirit of helping others. Then I got a bus, the car was still empty, not a few stops, the car will be full of passengers, including an old man on the last one on the car, because too many people, he Without a seat, I remembered the action of the young pioneer, and I knew how to do it myself. I immediately got up, the old man to help his seat, the old man full of heap smiled and said: "Thank you, thank you!" I learned before the young pioneers said: "Do not relationship, this is what we should do. "I am happy to get off the car, it seems to help others is a happy thing.今天是星期天,我独自一人在街上溜达,突然看见一个老奶奶拄着拐杖想过马路,一个系着红领巾的少先队员走了过来,搀着老奶奶的腰,扶着老奶奶过了马路,慢慢向我这边走来,我隐约听见老奶奶感激地说;“哦,谢谢!”。

电脑出问题的对话英语作文

电脑出问题的对话英语作文

电脑出问题的对话英语作文Possible essay:Computer Troubles。

A: Hey, what's wrong with your computer? It's so slow.B: I don't know. It's been acting up for a while. Maybe it's infected with a virus.A: Have you run a virus scan lately?B: Yeah, but it didn't find anything.A: Maybe you need to update your antivirus software.B: I think it's up to date. I checked it last week.A: Well, have you tried cleaning up your hard drive?B: No, I haven't. How do I do that?A: You can use the disk cleanup tool or the disk defragmenter tool.B: Okay, I'll give it a try. Thanks for the suggestion.A: No problem. Let me know if it helps.B: I will. By the way, do you know how to fix a blue screen of death?A: Oh, that's a serious error. It could be caused by hardware or software problems.B: Yeah, I'm afraid my computer is dying.A: Don't panic. You can try to diagnose the problem by checking the error message and the system log.B: How do I do that?A: You can search online for some troubleshooting tipsor ask a tech-savvy friend for help.B: Okay, I'll do that. Thanks for your advice.A: No problem. I hope you can fix your computer soon.B: Me too. I can't live without it.Computer troubles are a common and frustrating experience for many people. Whether it's a slow performance, a virus infection, a hard drive clutter, or a blue screenof death, computer problems can disrupt our work andleisure activities. However, most computer issues can be resolved with some basic knowledge and tools. For example, running a virus scan, updating the antivirus software, cleaning up the hard drive, or diagnosing the error message can often solve the problem. If all else fails, seeking professional help or replacing the faulty hardware may be necessary. In any case, it's important to backup our data regularly and maintain our computer's health to prevent future troubles.。

郑州市高中英语必修二Unit3TheInternet必考考点训练

郑州市高中英语必修二Unit3TheInternet必考考点训练

郑州市高中英语必修二Unit3TheInternet必考考点训练单选题1、Usually the traffic is quite busy in the morning,so you need to allow ________ time to get there.A.sufficientB.limitedC.reducedD.convenient答案:A考查形容词词义辨析。

句意:通常早上交通很繁忙,所以你需要留出足够的时间去那里。

A. sufficient足够的;B. limited有限的;C. reduced减少的;D. convenient便利的。

根据前文“Usually the traffic is quite busy in the morning”可知早上交通很繁忙,所以我们应该留出足够的时间。

故选A项。

2、People are no longer comfortable being alone, which is ________ by a study where participants were asked to stay awa y from social media for 24 hours.A.acknowledgedB.constructedC.informedD.confirmed答案:D考查动词词义辨析。

句意:人们不再喜欢独自一人,这是被一项要求参与者远离社交媒体24小时的研究所证实的。

A. acknowledged承认;B. constructed建设;C. informed通知;D. confirmed证实。

根据句子结构可知,which引导的是非限定性定语从句,指代的是前文的“人们不再喜欢独自一个人”,再根据空后by a study可知,此处指被研究证实的发现。

故选D。

3、Upon receipt of an inquiry or complaint, our company will contact the user and take appropriate measures to ________ the user’s concern.A.accessB.arouseC.acquireD.address答案:D考查动词词义辨析。

译林英语六年级上册英语练习10份

译林英语六年级上册英语练习10份

范文范例参考6AEnglishExerciseOneClass:_______________ Name:_________________一、用所给词的适当形式填空pick(they)upforme.(man)likedrinkingmilk.3.It's(Tom)turntoplaythepiano.girlisn'twearing(some)clothes.(be)anymilkandtwopineapplesinthefridgetwodaysago.theseshoesfityou(good)?girlislookingafter(he).Englishteachershowed(they)hisnewpen.9.There'salotof(rain)thereinspring.(rain)thismorning.二、句型转换weresomeapplesonthetable.(改为否认句)________________________________________________________________ girltellsusastory. (改为一般疑问句)________________________________________________________________ littleboypointedatthekingandlaughed.(改为否认句)________________________________________________________________can'tgotoschoolonfoot.(改为同义句)________________________________________________________________ wastimefordinner.(改为同义句)________________________________________________________________buyssomebreadandhoney.(改为一般过去时)________________________________________________________________rained yesterday. (改为同义句)完美Word格式整理版范文范例参考________________________________________________________________ lostherbike. (改为一般现在时)________________________________________________________________ sawsome antsonthecakes.(改为单数句)________________________________________________________________ played footballwithmyfriends.(提问)________________________________________________________________三、根据中文提示完成句子你昨晚看电视了吗?没有。

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1)We have a problem with the computer system, but I think it is fairly minor.2)My father died when I was too young to live on my own. The people of my hometowntook over responsibility for my upbringing at that point.3)the toys have to meet strict safety requirements before they can be sold to children.4)Radio and television have supplemented rather than replaced the newspaper as carriersof new and opinion.5)When it comes to this magazine, it is a digest of articles from many newspapers andmagazines around the world.2. Translate the passage into English ( P21 )A decade ago, Nancy did what so many Americans dream about. She quit an executive position and opened a household device store in her neighborhood. People like Nancy made the decision primarily for the improvement in the quality of their lives.But, to run a business on a small scale is by no means an easy job. Without her steady income, Nancy had to cut back on her daily expenses. Sometimes she did not even have the money to pay the premiums for the various kinds of insurance she needed.Fortunately, through her own hard work, she has now got through the most difficult time. She is determined to continue pursuing her vision of a better life.I.TRANSLATION1.Though greatly affected by the consequences of the global financial crisis, we arestill confident that we can face up to the challenge and overcome the crisis.2.Under threat of constant sand storms, we were compelled to leave our cherishedvillage and move to the new settlement.3.According to a recent online survey, a lot of consumers say they may be motivatedto consider buying products shown in TV commercials.4.Having spotted a truck driver dumping contaminated waste alongside the river, theold man reported to the police at once.5.Some scientists hold to the firm conviction that people will come to likegenetically modified crops someday since they can increase yields and help combat hunger and disease in the developing world.2.Shortly after he achieved freedom he became a member of an organization that assisted fugitive slaves. He secretly returned to the United States from Canada several times to help others to travel the Underground Railroad to freedom. Once some slave catchers closed in on the escaping slaves and Henson when they were on the run. He disguised them and successfully avoided capture. In addition, later he built a small settlement in Dresden in Canada for escaped slaves, setting up a chapel and a school where they could learn useful ways of making a living. He held to the conviction that slavery would be abolished, all the slaves would be liberated, and the day was bound to come when racial discrimination no longer existed.1.1).The Internet is changing the way people live, no matter whether they are in urban or rural areas.2).Medium-sized and small companies are more vulnerable to the threat of the global economiccrisis than large ones.3).With regard to our term papers, the professor asked us to analyze the chart of unemployment first,and then provide critical reflections on the nation’s economic development.4).It never occurred to him that their team would win the basketball match by a large margin.5).Looking back on my twenty years’ teaching in high school, I attributed my success to patience,talent, and the constant pursuit of knowledge.2.It is almost impossible to keep a determined burglar out. All you can do is discourage him for a few minutes, thus exposing him to police patrols or those wandering around. Common sense tells us that lighting is a barrier to criminal activity. A light should be fixed in the doorway and switched on at night.Make sure/assure yourself that you don’t leave the door on the latch if you happen to be the last to come in. If you decide to buy a sophiticated electronic alarm system, be sure to ask for its signs and put them up on both windows and doors. In addition you may have it hooked up to a police station.II. Translation(P. 109-110)1. (P. 109)1.The volunteers sent by the Red Cross disinfected , with great caution, thedrinking water in the village so as to avoid an outbreak of plague2.Einstein spent many years trying to unify the theories of electromagnetism andgravity but failed.3.Professor Wang received / won the Presidential Award fro his excellence instimulating students’ creative imagination.4.As there were some major design flaws, the board of directors didn’t approve ofthe economic stimulus package.5.Having realized that nobody could help him, Jordan finally came to theconclusion that he had to face reality and meet the challenge by himself.2. (P. 110)What was remarkable about 2005 was perhaps that the United Nations declared it “The World Year of Physics”. It was the 100th anniversary of Einstein’s theory of relativity and the 50th anniversary of his death. In 1905 Einstein published five highly important essays in the history of science, thus revolutionizing physics. His great achievement can be credited to his impressive powers of imagination, constant questioning, and not giving a fig for authority. It is beyond doubt that Einstein was the greatest scientist in the 20th century.1. (P. 182)11).The red house stands out against the old trees that reach high up to the sky.12).The salary in/for my new job is great, but for the rest, I’m not satisfied.13).The waters of the two streams mingle near our village.14).We should not mock at other people’s religious beliefs.15).The curtains of the room are not quite in tune with the style of the furniture.2. (P. 182)Here and there we see young artists who stand out from other people. They may be in worn out jeans all the year round, or walk barefoot / in bare feet even in winter, or drink to excess, or cling to the fancy of creating a masterpiece without actually doing any creative work. In fact, many of them act like this just to look the part, or to be "in tune with" other artists. They have forgotten that only through persistent effort can one achieve success.。

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