homework 3
人教版五年级英语上册配套练习册答案
one pencil two pencils
one tomato two tomatoes
one book two books
one box
Ⅳ.Read and match.(读一读，连一连。)
two boxes
healthy
fresh
delicious
hot
6
sweet
Ⅴ.Look and write. (看图，写一写。) 1. ice creams 2. fish 3. fresh 4. hot 5. healthy
1. A 2. A 3. B Ⅳ.Number and write. (将下列课程从星期一到星期五的顺序标号。)
5
4
3
1
2
Ⅴ.Read and fill. (读一读，并根据上图填空。)
Dear Lily, I’m in Grade Five now. I have Chinese and art on Thursdays. I have English and PE on Wednesdays. I have English and computer class on Tuesdays. I have English and art on Mondays. I have maths and music on Fridays. What about you? Yours, Li Ping
Ⅴ.Look and write.(看一看，写一写。) 1. family 2. sunny 3. windy
Part B
Ⅰ. Read and number.(读一读，给句子排序。) 4, 6, 3, 2, 8, 1, 5, 7
Ⅱ. Read and circle(读一读，根据句意圈出正确的图片。) 1. A 2. B
译林版三年级上册 UNIT2-NUIT3(8课时)优秀教案
group by group (3)Read together 板书 A：Hello.I’m… Are you…? T:Try to answer my question. 教师出示 Yes,I am. T：Who can read it? 让学生试着读读看。 (1)Read with the teacher (2)Read one by one/group by group (3)Read together 板书：Yes,I am. b.Pairwork (1)T-S,S-T，S-S T:Hello,I’m Miss Zhang.Are you…?
学生抢答，会说的站起来大声说。
（1）The sentences to greet(用来打招呼的句子) T ： Could you please tell me the sentences to greet?Say them
loudly,please.
例如：Hello./Hi./Good morning.
教学重点
1.能熟练地会认、会读、会说 Are you…?并且能熟练地用 Yes,I am.和 No,I’m not.来回答。
2.能初步会读、会说、会写 Goodbye.
3.能会认读并会写字母 Ee Ff Gg
教学难点
1.能初步会读、会说、会写 Goodbye.
2.能会认读并会写字母 Ee Ff Gg 教学准备
4
第 2 单元 课题：I'm LiuTao
Homework3
1.The speaker is a famous professor from Hunan University.是来自湖南大学的一位著名的教授。
2.It is not for profit, she said.她说：“这次飞行不是为了谋利。
3.Every base he would close and programme he would trim has a lobby to defend it. 他要关闭的基地和削减的项目背后都有一个游说团体在维护。
4.On this front, there are already signs of progress.有迹象显示，中国在这方面已取得进展。
5.It be demand that atomic weapons be prohibit .人们要求禁止使用原子武器。
6.This could be a class project!这可以是一项课程计划。
7.Who can promise what?谁能够保证什么？8.These deals were seen as a way to promote trade.这些交易被视为一种促进贸易的方法。
9.I now pronounce you man and wife.现在我宣布你们结为合法夫妇。
10.Read after the standard pronunciation.跟着标准发音朗读。
11.My first piece of work was to find out a proper piece of ground.我的第一步工作就是着手物色一块适当的地方。
12.Push hard and fast.用力而快速的按。
13.Please put them on the scales.请把它们放在磅秤上。
14.I like puzzle games best.我最喜欢玩智力游戏。
15.She walked in looking slightly puzzled and nervous.她走进来，看起来有些迷惑和不安。
写作业时不做三件事英语
1.Avoid Distractions:When doing homework,its crucial to minimize distractions. This includes turning off your phone or setting it to silent mode,closing unnecessary tabs on your computer,and finding a quiet place to work.2.Dont Procrastinate:Procrastination can lead to lastminute stress and lower the quality of your work.Instead,break down your assignment into smaller tasks and tackle them one by one.Set a specific time to start and finish your homework to stay on track.3.Dont Rush Through It:Taking the time to understand the material and think through your answers is essential for learning.Avoid the temptation to rush through your homework just to get it done.Instead,focus on the quality of your work and make sure you understand the concepts being taught.4.Dont Copy from Others:Plagiarism is a serious academic offense.Always do your own work and avoid copying from classmates,online sources,or any other materials.If youre stuck,ask for help from your teacher or a tutor rather than resorting to cheating.5.Dont Neglect Reviewing:After completing your homework,take the time to review what youve done.This helps reinforce your understanding and can also help you catch any mistakes before submitting your work.6.Dont Ignore the Guidelines:Pay close attention to the instructions provided by your teacher.Ignoring these guidelines can lead to misunderstandings and lower grades.7.Dont Forget to Take Breaks:While its important to stay focused,taking short breaks can actually improve concentration and e the Pomodoro Technique or a similar method to structure your study sessions with breaks.8.Dont Overload Yourself:Its easy to get overwhelmed with multiple assignments. Prioritize your tasks based on deadlines and difficulty,and dont be afraid to ask for extensions if youre genuinely struggling to manage your workload.9.Dont Skip Reflection:After completing your homework,reflect on what youve learned and how you can apply it.This reflection can help you better understand the material and prepare for future assignments or exams.10.Dont Neglect SelfCare:While homework is important,so is your health.Make sure to get enough sleep,eat well,and engage in physical activity to maintain your wellbeing and improve your focus and productivity.。
随机过程2016作业及答案3
1.Players A and B take turns in answering trivia questions, starting with player A answering the first question. Each time A answers a question, she has probability p 1 of getting it right. Each time B plays, he has probability p 2 of getting it right.(a)If A answers m questions, what is the PMF of the number of questions she gets right?The r.v.is Bin(m,p 1),so the PMF is mkp k 1(1 p 1)m k for k 2{0,1,...,m }.(b)If A answers m times and B answers n times,what is the PMF of the total number of questions they get right (you can leave your answer as a sum)?Describe exactly when/whether this is a Binomial distribution.Let T be the total number of questions they get right.To get a total of k questions right,it must be that A got 0and B got k ,or A got 1and B got k 1,etc.These are disjoint events so the PMF isP (T =k )=k X j =0✓mj ◆p j 1(1 p 1)m j ✓n k j◆p k j 2(1 p 2)n (k j )for k 2{0,1,...,m +n },with the usual convention that n k is 0for k >n .This is the Bin(m +n,p )distribution if p 1=p 2=p ,as shown in class (using the story for the Binomial,or using Vandermonde’s identity).For p 1=p 2,it’s not a Binomial distribution,since the trials have di ↵erent probabilities of success;having some trials with one probability of success and other trials with another probability of success isn’t equivalent to having trials with some “e ↵ective”probability of success.(c)Suppose that the first player to answer correctly wins the game (with no prede-termined maximum number of questions that can be asked).Find the probability that A wins the game.Let r =P (A wins).Conditioning on the results of the first question for each player,we have r =p 1+(1 p 1)p 2·0+(1 p 1)(1 p 2)r,which gives r =p 11 (1 p 1)(1 p 2)=p 1p 1+p 2 p 1p 2.1SI 241 Probability & Stochastic Processes, Fall 2016Homework 3 Solutions随机过程2016作业及答案2.A message is sent over a noisy channel.The message is a sequence x1,x2,...,x n of n bits(x i2{0,1}).Since the channel is noisy,there is a chance tha t any bit might be corrupted,resulting in an error(a0becomes a1or vice versa).Assume that the error events are independent.Let p be the probability that an individual bit has an error(0<p<1/2).Let y1,y2,...,y n be the received message(so y i=x i if there is no error in that bit,but y i=1 x i if there is an error there).To help detect errors,the n th bit is reserved for a parit y check:x n is defined to be 0if x1+x2+···+x n 1is even,and1if x1+x2+···+x n 1is odd.When the message is received,the recipient checks whether y n has the same parit y as y1+y2+···+y n 1. If the parity is wrong,the recipient knows that at least one error occurred;otherwise, the recipient assumes that there were no errors.(a)For n=5,p=0.1,what is the probabilit y that the received message has errors which go undetected?Note that P n i=1x i is even.If the number of errors is even(and nonzero),the errors will go undetected;otherwise,P n i=1y i will be odd,so the errors will be detected.The number of errors is Bin(n,p),so the probability of undetected errors when n=5,p=0.1is✓52◆p2(1 p)3+✓54◆p4(1 p)⇡0.073.(b)For general n and p,write down an expression(as a sum)for the probability that the received message has errors which go undetected.By the same reasoning as in(a),the probability of undetected errors isX k even,k 2✓n k◆p k(1 p)n k.(c)Give a simplified expression,not involving a sum of a large number of terms,for the probabilit y that the received message has errors which go undetected.Hint for(c):Lettinga=X k even,k 0✓n k◆p k(1 p)n k and b=X k odd,k 1✓n k◆p k(1 p)n k,the binomial theorem makes it possible tofind simple expressions for a+b and a b, which then makes it possible to obtain a and b.2Let a,b be as in the hint.Thena +b =X k 0✓n k ◆p k (1 p )n k =1,a b =X k 0✓n k ◆( p )k (1 p )n k =(1 2p )n .Solving for a and b gives a =1+(1 2p )n 2and b =1 (1 2p )n2.Xk even,k 0✓n k ◆p k (1 p )n k =1+(1 2p )n 2.Subtrac ting o ↵the possibility of no errors,we haveX k even,k 2✓n k ◆p k (1 p )n k =1+(1 2p )n 2 (1 p )n .Miracle check :note that letting n =5,p =0.1here gives 0.073,which agrees with (a);letting p =0gives 0,as it should;and letting p =1gives 0for n odd and 1for n even,which agai n makes sense.33.Let X be a r.v. whose possible values are 0, 1, 2,...,with CDF F .In some countries, rather than using a CDF, the convention is to use the function G defined by G (x )=P (X <x ) to specify a distribution. Find a way to convert from F to G , i.e., if F is a known function show how to obtain G (x )for all real x .Write G (x )=P (X x ) P (X = x )=F (x ) P (X = x ).If x is not a nonnegative integer, then P (X = x )=0so G (x )=F (x ). For x a nonnegative integer,P (X = x )=F (x ) F (x 1/2)since the PMF corresponds to the lengths of the jumps in the CDF. (The 1/2was chosen for concreteness; we also have F (x 1/2) = F (x a )for any a 2 (0, 1].)Thus,G (x )=(F (x )if x /2{0,1,2,...}F (x 1/2)if x 2{0,1,2,...}.t More compact ly, we can also write G (x )=lim !x F (t ), where the denotes taking a limit from the left (recall that F is right continuous), and G (x )=F (d x e 1),where d x e is the “ceiling” of x (the smallest integer greater than or equal to x ).4.There are n eggs, each of which hatches a chick with probability p (independently).Eac h of these chicks survives with probability r , independently. What is the distri-bution of the number of chicks that hatch? What is the distribution of the number of chicks that survive? (Give the PMFs; also give the names of the distributions and their parame ters, if they are distributions we have seen in class.)⇤⇥ ©⇤⇥ x ⇤⇥ ⇤⇥ ⇤⇥ ©⇤⇥ ©⇤⇥ x ⇤⇥ ©⇤⇥ ⇤⇥©Let H be the number of eggs that hatch and X be the number of hatchlings that survive.Think of each egg as a Ber noulli trial,where for H we define “success”to mean hatching,while for X we define “success”to mean surviving.For example,in the picture above,where ⇤⇥ ©denotes an egg that hatches with the chick surviving,⇤⇥ x denotes an egg that hatched but whose chick died,and ⇤⇥ denotes an egg that hatch,the events H =7,X =5occurred.By the of the Binomial,H ⇠Bin(n,p ),with PMF P (H =k )= n k p k (1 p )n k for k =0,1,...,n .The eggs independently have probability pr each of hatching a chick that survives.By the story of the Binomial,we have X ⇠Bin(n,pr ),with PMF P (X =k )= n k (pr )k (1 pr )n k for k =0,1,...,n .5.A scientist wishes to study whether men or women are more likely to have a certain disease, or whether they are equally likely. A random sample of m women and n men is gathered, and each person is tested for the disease (assume for this problem that the test is completely accurate). The numbers of women and men in he sa B n(n,w p ho ha He ve re p h e di and seas p e ar are e X unkno and Y wn,re p s and ec w tiv e e r a ly,Y i 2.1 2 e w in ith tereste d ⇠Bi in n(testin g p 1) a the le mp t t X ,m nd ⇠) “null hypothesis” p 1 = p 2.(a) Consider a 2 by 2 ta ble listing with rows corresponding to disease status and columns corresponding to gender, with each entry the count of how many people have that disease status and gender (so m + n is the sum of all 4 entries). Supp ose that it is observed that X + Y = r .The Fisher exact test is based on conditioning on both the row and column sums, so m, n, r are all treated as fixed, and then seeing if the observed value of X is “extreme” compared to this conditional distribution. Assuming the null hypothesis, use Ba yes’ Rule to find the conditional PMF of X given X + Y = r .Is this a distribution we have studied in class? If so, say which (and give its paramet ers).First let us build the 2 ⇥ 2 table (conditioning on the totals m, n, and r ).4Women Men Total Disease x r No Diseasem x r r x +n x m +n r Total n m m +nNext,let us compute P (X =x |X +Y =r ).By Ba yes’rule,P (X =x |X +Y =r )=P (X +Y =r |X =x )P (X =x )P (X +Y =r )=P (Y =r x )P (X =x )P (X +Y =r ).Y Assum Bi i n n (g n,th p e )w nu i l t l h h X ypot inde h p esi e s nde an n d t l of etti Y ng ,s p o =X p +1Y =p 2Bi ,w n(e n h +ave m,X p ).⇠T Bi h n us (,m,p )and ⇠⇠r x p r x p p )r n (1 r +x n m x p x (1 p )m x (1m + n r p )m +n r P (X =x |X +Y =r )== m nx m +r n rx .So the conditional distribution is Hypergeometric with parameters m, n, r.(b) Give an intuitive explanation for the distribution of (a), explaining how this problem relates to other problems we’ve seen, and why p 1 disappears (magica lly?) in the distribution found in (a).This problem has the same structure as the elk (capture-recapture) problem. In the elk problem, we take a sample of elk from a population, where earlier some were tagged, and we want to know the distribution of the number of tagged elk in the sample. By analogy, think of the women as corresponding to tagged elk, and men as corresponding to unta gged elk. Having r people be infected with the disease corresponds to capturing a new sample of r elk the number of women among the r diseased individuals corresponds to the number of tagged elk in the new sample.Under the null hypothesis and given that X + Y = r ,the set of diseased people is equally likely to be any set of r people.It makes sense that the conditional distribution of the number of diseased women does not depend on p ,since once we know tha t X + Y = r ,we can work directly in terms of the fact that we have a population with r diseased and m + n r undiseased people, without worrying about the value of p that originally generated the population characteristics.5。
人教版小学五年级上册英语第二能力提升卷(Word版含答案) (1)
人教版五年级英语上册第二单元能力提升卷(时间：90分钟满分：100分)题号一二三四五六七八九十十一十二总分得分听力部分(40分)一、听录音，用数字给下列单词标号。
(8分)1. feet feed tea see( ) ( ) ( ) ( )2. beef repeat eat feed( ) ( ) ( ) ( )3. meat ready really ready( ) ( ) ( ) ( )4. Tuesday Thursday Monday Wednesday ( ) ( ) ( ) ( )二、听录音，选出与图片相符的单词或词组，将序号填入方框中。
(8分)A. shyB. helpfulC. hard-workingD. strongE. do homeworkF. play footballG. read booksH. wash clothes三、听录音，判断图片正误，正确的打“√”，错误的打“×”。
(8分) 1. 2. 3. 4.( ) ( ) ( ) ( )四、听录音在横线上填入所缺的内容。
(8分）1. A: What do you have on____________?B: I have ____________and____________.2. A: What do you often do on the____________?B: I often ____________clothes and do____________.3. A: Do you often ____________TV on the weekend?B: No, I____________.五、听录音，选择正确的案。
(8分)( )1. What's Eric's favourite book?A. Pete the CatB. Harry PotterC. Capra Cat ( ) 2. What does Sarah often do on Saturdays?A. She often reads books.B. She often washes her clothes.C. She often watches TV.( ) 3. Does Eric often play football on the weekend?A. Yes, he does.B. No, he doesn’t.C. No, he does. ( )4. What are they going to do together?A. Do homeworkB. Draw cartoonsC. Read books.笔试部分(共60分)六、选出每组中不同类的单词。
homework_3_参考答案
Exercise 2Question 2. Computer PurchaseLet us assume that you are purchasing a new computer for a specific usage. You need to choose a computer from various available configurations.Listed below are four different usage cases of a computer (a-d). For each usage case, identify components of the computer configuration that are most important to consider. Explain your answers.Components to be considered include (but are not limited to): ∙Monitor size/resolution∙Graphics card/video card∙Storage devices (for example, DVD-ROM)∙Memory (RAM, cache, and hard disk)∙Disk controller interfaces (ATA, EIDE)For example, if a computer were to be used for viewing movies, a DVD-ROM drive is needed since movies are available as CDs and now increasingly as DVDs. A l arge monitor (about 19”) that supports high resolutions and a video card will also be necessary to enjoy the movie.a. Simultaneously running a number of programsLarge capacity memory (at least 1G ) is needed to stores data and instructions needed to execute programs when a number of programs run. In order to resolve this question, we should select the appropriate processor.T he Intel® Core™ Duo processor with its two execution cores is optimized formulti-threaded applications and multitasking. You can simultaneously run multiple demanding applications, such as 3-D games or serious scientific research programs, while downloading files or runningvirus-scanning security programs in the background.b. Running a speed-critical applicationConsidering system running speed: AMD processor is typically with less cost, sometimes even faster than Intel's products.So the AMD Opteron™ processor is needed. The AMD Opteron processors with Direct Connect Architecture and HyperTransport™ Technology deliver leading-edge 32-bit performance today and enable you to transition to 64-bit computing at your own pace, without sacrificing your x86 technology investment.A mother board with high speed front side bus is neededc. Storing and retrieving huge volumes of dataA large storage hard disk is needed (at least 800G) to store huge volumes of data, at the same time, we should foresee the demand of it.A DVD-RW is needed when you want to store your huge volumes of data in DVD-ROM.A motherboard with EIDE interface can accommodate a total of four devices, maybe you will get up to2 hard disk or more.d. Purchasing a basic configuration, to be upgraded later as neededFor upgrading your system, you must set your system has ability of upgrade and extended. So one good motherboard is needed.The Intel® Desktop Board D975XBX is designed to deliver the best experience for advance d gamers and power-users. Based on the Intel® 975X Express Chipset and Intel® Pentium® processor Extreme Edition, this board has the best performance and the ability of upgraded. The Intel® Desktop BoardD975XBX supports Intel® Viiv™ technology, and comes with the software required to help meet Intel®Viiv™ technology brand verification requirements.Question 3. Laptop Computer SelectionYou are a new graduate student enrolling in a Masters in Information Technology program. The department requires you to have a computer with the following requirements:∙512 MB of RAM∙20 GB hard drive∙CD-ROM drive∙Wireless connection∙Ethernet network card∙Windows XP Professional versionYour school has wireless connection, and Ethernet jacks. However, some classes are three hours long, and your AC adapter may not be long enough to reach an outlet. You also would be carrying this computer around from class to class.The most you can spend is US$1200.Indicate the range of values you desire for each of the following criteria: a. Weightb. Screen sizec. Number of USB portsd. Number of Firewire portse. Need CD-RW?f. Need DVD-ROM?g. Need DVD-RW?h. Manufacturer preferences?i. Search the Internet for two suitable computers meeting the above requirements and your budget constraint. Submit screenshots of the Web pages detailing the computer configuration and price.j. Record your search results in a MS Excel spreadsheet. Fill column A with the following category labels:1. Manufacturer2. Processor3. Memory (maximum upgrade capacity)4. Screen size5. Weight6. Graphics card7. USB8. Firewire9. CD-ROM10. DVD-ROM11. Communications (e.g. wireless, Ethernet)12. Battery life13. Price14. Available RebateSave and submit your Excel file.k. Make your final purchase decision and justify your decision.Unit 1 and Unit 2 Review Materials2. Binarya.Define bit.b.Define byte.c.Fill in the following chart, listing the prefixes used forthe amount of bytes shown:d.Fill in the following chart, converting binary numbers todecimal and decimal numbers to binary:(Note:The numbers that appear in the table below will differon an exam from the numbers that appear on the exam's review sheet.)e.Although in sales literature 1000 bytes and 1024 bytes areboth commonly referred to as a kilobyte, in computing the only correct number of bytes in a kilobyte is1024. Explain why 1024 is correct. Many quantities in binary computers are restricted to powers of 2, and 210 is 1024, which is so close to 1000 that kilo is used informally.f.How can the difference in measuring bytes presented in parte impact a consumer when they are purchasing a hard disk drive?A hard disk drive is typically measured traditionally, in powers of 10. Thereforea gigabyte in a hard disk is 109, not the larger 230. Not knowing this, aconsumer might be surprised that the disk capacity was less than he thought was advertised.3. Component IdentificationChoose among the following components to label the image: MotherboardPower supplyBIOS ROM ChipCooling fanExpansion slotRAM chipExpansion cardDisk drivesChipsetIDE cableEthernet cablePCI busa)Label A is _ Power supply ____.b)Label B is __ Cooling fan ___.c)Label C is _ Expansion slot____.d)Label D is _ Expansion card____.e)Label E is _ Motherboard____.f)Label F is __ Disk drives ___.g)Label G is __ IDE cable ___.Describe the functionality of each of the followingcomponents (in 2 sentences or less):h)Microprocessor: Processes instructions stored in main memoryi)RAM: Stores data and instructions temporarily.j)Bus: Pathway through which data is transferred from one part of a computer to anotherk)Expansion card: Enables a computer to control peripheral devices such as the monitor and the microphonel)Disk drive: Stores data permanently (even after the computer is turned off).m)IDE cable: Transfers data from storage devices to the motherboard8. I/Oa.Define I/O device. An I/O device, or input/output device, provides the userwith ways of giving the processor data to process and ways of receivingprocessed datab.Consider that a computer requires I/O devices to be able tointeract with its environment. Explain why it is necessaryfor computers to have these devices. The basic definition of acomputer includes input and output. These devices are necessary for thecomputer to exist. Differing I/O devices allow alternate input and output, butminimally the computer needs at least one of eachc.Give four examples of I/O devices. [Choose from] Keyboard; monitor;tape backup drive; scanner; microphone; speakers; CD writer; …d.For each I/O device in your answer to part c, explain thedevice's function from the perspective of a user.i.A keyboard provides data to a computer, to direct its behavior or supplyinformation for processing (name, address telephone number).ii.A monitor displays to the user the status and results of work performed by the computer.iii.A tape backup drive receives a copy of information stored on hard disk drives, and can later supply information to be stored on that hard disk drivein case the disk drive crashes or a file is accidentally deleted.iv.A scanner translates a picture or document to a bitmap image that can be processed by a computer, or included in other work like a web page orWord documentv.A microphone translates speech or music into digital from that can be processed by the computer.12. Picture Qualitya.Explain resolution, with respect to a monitor.Number of pixels on the screenb.List two typical monitor resolutions.1024x768, as an example.640x480, as an example.c.Explain color depth, with respect to a monitor.Maximum number of colors on the screen at one time.d.List two typical monitor color depths.16 bit, as an example.24 bit, as an example.e.Consider that the higher the resolution and the higher thecolor depth, the more system resources are required todisplay output on the monitor.e the resolutions from part b and the color depthsfrom part d to calculate the amount of RAM required todisplay the image. 1024x768x24/8=2.25MB, as an example.ii.Explain the calculation you made in part e.i in a waythat confirms the statement made at the beginning ofpart e—that "the higher the resolution and the higherthe color depth, the more system resources are requiredto display output on the monitor." The calculations in partE.i demonstrate that by increasing either the resolution or the color depththat the amount of memory required will increase, demonstrating thatmore system resources (RAM) are required.13. Port IdentificationConsider the following devices:MousePrinterKeyboardModemSpeakerDigital cameraEthernet jackMonitorFor the following questions, indicate which device(s) should be plugged in which port(s) A-H shown in the diagram below.f.What device(s) can be plugged into port A? Keyboard or mousei.What is the name of this port? PS/2 portii.Is this a serial port or parallel port? Serialg.What device(s) can be plugged into port B? Digital camera, keyboard,mouse, printer, external storage, network adapter, etci.What is the name of this port? USB portii.Is this a serial port or parallel port? Serialh.What device(s) can be plugged into port C? Modem or mousei.What is the name of this port? DB-9 (serial) portii.Is this a serial port or parallel port? Seriali.What device(s) can be plugged into port D? Printeri.What is the name of this port? Parallel (printer) portii.Is this a serial port or parallel port? Parallelj.What device(s) can be plugged into port E? Speakerk.What device(s) can be plugged into port F? Monitorl.What device(s) can be plugged into port G? Phone linem.What device(s) can be plugged into port H? Ethernet network。
homework3
1 为什么要引入shell编程1.1 如何给变量赋值，并查看变量的值1.1 “$”的含义是什么1.2 如何进行数值计算。
请解释expr 12 * 6为什么不行。
1.2.1 如何进行小数计算？1.3 如何把计算出的值赋给一个变量。
1.3.1 a=expr 16 / 2 为什么不行？1.4 如何得到一个表达式（大于，小于，等于）的真假值1.4.1 如何比较两个字符串？1.4.2 如何求反？1.4.3 [ 1 ]的逻辑返回值是多少？1.5 请你编写一个if的bash脚本完成：输入字符串是haha，那么就打印出yeah!，否则打印hehe。
1.5.1 如何给shell脚本加注释？1.5.2 如何接受用户的输入1.5.3 请解释下面的语句为什么不成功#!/bin/bash#defiewjfifewjfdread aif [ $a = "haha" ] thenecho "yeah!"elseecho "hehe"fi1.6 请编写一个程序，计算1+ (100)#!/bin/bashsum=0i=2while (($i<=100))dosum=$(($sum +$i))i=$(($i+2))doneecho $sum1.6.1 利用shell编程完成20数的fibonacci数列num1=0num2=1echo $num1echo $num2couter=$(expr $1 - 2 )#echo $numwhile [ $couter -gt 0 ]dotmp=$(expr $num1 + $num2 )echo $tmpnum1=$num2num2=$tmpcouter=$(expr $couter - 1 )done1.7 给一个文本文件加行号，并输出1.7.1 怎么给一个shell脚本传参数1.7.2 如何从一个文件中每次读一行1.7.3 如何重定向输入和输出1.7.4 如何从终端上读入一行1.7.5 如何把行号拼接到一行上1.7.6 如何判断传递的参数的个数1.7.7 如何退出bash脚本的执行1.8 如何调试shell脚本？。
pep三年级下册英语教案unit3
1.能听、说、认读单词：giraffe, tall, short, fat.2.能用句型“It’s tall/short/fat …”来形容动物的某些特征。
3.能画出自己喜欢的动物，并用简单的句型描述此种动物。
能听、说、读、写单词：giraffe, tall, short, fat.能用“It’s tall/short/fat …”来形容动物的某些特征。
人物头饰、教学光盘、教学挂图、白纸、教学课件。
1.小组讨论喜欢的动物，并进行记录。
教师利用课件展示出以前学过的动物宝宝，并带领大家一起去探望动物宝宝们,学生们开火车复习动物宝宝们：duck,cat,dog,pig,tiger,bird,bear,elephant等。
2.找一名学生当小老师来运用句子问答重新复习一遍，如：S1：What’s this?S2:It’s a duck.1.教师出示动物园，并说：Look at the zoo.出示长颈鹿的照片，并介绍：This is the new friend. Look at that giraffe. 引出单词giraffe,并教读，注意发音，可以点名让某学生发音并纠正。
2.教师让学生观察长颈鹿有什么特征，教师可以借助肢体语言帮助学生认识长颈鹿，教师做出表示高的动作，并介绍tall,板书并正确教读。
3.教师利用课件展示一张更高的长颈鹿，并说：so tall，然后将句子补充完整It’s so tall.4.讲解so的用法，强调某种程度。
为了巩固so的用法，教师可以利用课件展示更多。
如：展示一张苹果的图片，red－so red－It’s so red.5.教师展示一张bear的图片，对比giraffe的图片，引出short,教读并板书。
6.展示一个胖的bear和瘦的giraffe对比，教师引出单词fat,区别cat,讲解单词。
7.讲解如果想表达两种特征，可以加and。
如：It’s short and fat.8.播放Let’s talk版块录音，学生跟读，学习正确的语音、语调。
Homework 3
Homework 3
请对照汉语原文，指出译文中的错误，说明原因，并修改译文：
墨鱼干简介
墨鱼干是我国四大海味珍品之一。
本品不仅是味道鲜美的席上佳肴，而且被公认为高级海味补品。
本产品精选东海鲜活墨鱼经古老传统的加工方法及现代最先进的晒烤技术精选而成。
具有保鲜味保原质的特点，是人见人爱，省亲访友的馈赠佳品。
DRIED INKFISH
Dried Inkfish，as one of the four seafood treasures, is not only a delicious food, but also a generally-recognized high-quality tonic.
With fresh inkfish from the East China Sea as material, this product is processed with traditional methods and the most advanced baking technique. It is tasty with original flavor, very popular for you to present to your family members and friends as a gift.
1。
Homework3
PART V TRANSLATION (60 MIN)SECTION A CHINESE TO ENGLISHTranslate the underlined part of the following text into English. Write your translation on ANSWER SHEET THREE.几千年的历史可以证明，中国知识分子最关心时事，最关心政治，最爱国。
这最后一点，是由中国历史环境所造成的。
在中国历史上，没有那一天没有虎视眈眈伺机入侵的外敌。
历史上许多赫然有名的皇帝，都曾受到外敌的欺侮。
老百姓更不必说了。
存在决定意识，反映到知识分子头脑中，就形成了根深蒂固的爱国心。
“天下兴亡，匹夫有责”，不管这句话的原形是什么样子，反正它痛快淋漓地表达了中国知识分子的心声。
在别的国家是没有这种情况的。
SECTION B ENGLISH TO CHINESETranslate the following text into Chinese. Write your translation on ANSWER SHEET THREE.Happiness lies not in the mere possession of money; it lies in the joy of achievement, in the thrill of creative effort. The joy, the moral stimulation of work no longer must be forgotten in the mad chase of evanescent profits. These dark days, my friends, will be worth all they cost us if they teach us that our true destiny is not to be ministered unto but to minister to ourselves, to our fellow men. Recognition of that falsity of material wealth as the standard of success goes hand in hand with the abandonment of the false belief that public office and high political position are to be valued only by the standards of pride of place and personal profit; and there must be an end to a conduct in banking and in business which too often has given to a sacred trust the likeness of callous and selfish wrongdoing.PART VI WRITING (45 MIN)The booming business of online socialization has given birth to a great many Social Network Sites (SNS), instant messaging tools and blog/microblog service producers. All these have brought people much convenience and pleasure, as well as many problems and even injuries. What is your view on this? Write an essay of about 400 words. You should supply an appropriate title for your essay.In the first part of your writing you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary.Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.Write your essay on ANSWER SHEET FOUR.。
homework3
Have you ever watered a garden and watched the water disappear(消失) into the soil? This fun experiment shows how plants take water from the ground to grow. Ask an adult to help you.You Will Need:• Medium-sized glass• Water• Red food coloring• Spoon• 1 celery stalk with leaves (一根带叶的芹菜)You Will Do:1. Fill the glass halfway with water.2. Stir(搅拌) in enough food coloring to make the water dark red.3. Ask Mom or Dad to cut 1 inch off the bottom of the celery stalk. Place the stalk in the water and let it stand overnight.What Will Happen?The leaves will turn red, as well as the tiny tubes running up through the stalk. Break the stalk in half, and you will see red dots in each piece.Why?As a plant grows, its roots act like straws(麦秆状吸管), sucking water up into the stem or stalk. Tiny tubes（管）inside the stalk carry water farther up into the leaves. (By coloring the water red, this is easier to see.) The red dots show a cross-section of the tiny tubes through which the water traveled.(190)51. What is this article mostly about?A. how water protects plantsB. how water can change colorsC. how celery stalks grow in waterD.how plants get water from the ground52. Which of these things is needed for Step 1 of the experiment?A. Water.B. Spoon.C. Celery stalk.D. Food coloring.53. In which part of the article can you find how the water moves through plants?A. “You Will Nee d”B.“You Will Do”C. “What Will Happen”D. “Why”F or one week in April, millions of people chose not to watch TV for “TV Turnoff Week”.TV Turnoff Week started in 1995 and is more popular every year. Many people discover that you can have a good time with the TV off. If that sounds crazy to you, just have a look at some numbers:―An American teenager spends 900 hours every year at school; the same teenager spends 1,023 hours every year watching TV. That’s 2 hours 49 minutes every day. ―An average（平均）British person (not just teenagers) watches 3 hours 35 minutes every day.―In the US, most TV has adverts. American children see 20,000 adverts every year. By age 65, an American has seen two million ads!But some research from Britain says that may not be a problem. The London Business School watched people carefully during TV adverts and they discovered that people don’t watch a lot of the ads. The researchers discovered that the most common activity during the adverts was talking to other people in the room. Many other people started reading or doing housework or changed channels during adverts. They only really watched them about 25 per cent of the time. 51．During TV Turnoff Week, many people don’t __________.A.watch TVB. change channelsC. watch advertsD. do their school work52．From the passage we can learn that __________.A. American children see more adverts on TV than their parentsB. British people spend more than 3 hours a day in front of their TVC. Researchers noticed that most people changed channels during adsD. An American teenager spends more time at school than watching TV 53．The writer’s purpose is __________.A. to advise us to spend less time on TVB. to tell us how to avoid watching advertsC. to show us how many adverts American TV hasD. to ask us to turn off TV during TV Turnoff WeekPassage3Picky, PickyScientists have no idea exactly why birds choose certain objects to build their nests. Butscientists know that the main reason birds build nests is to keep their babies safe, warm andhealthy.Baby birds grow faster and are healthier when they are warm. They also learn to fly and leavethe nests sooner than birds without warm homes.What A Yarn (纱)Oriole’s Nest Yarn is big on an oriole’s shopping list during nest building. Scientists are still trying to workout why so many birds choose white yarn over other colors for nest building.Scientists think that the white objects remind birds of cotton fluff (绒毛) they find in thewild.Do It NaturallyEven though birds can help us recycle some of our junk by using it to build nests, they alsoneed to use lots of natural things. Long grass, dried sticks, spider’s silk and mud are some of thenatural ingredients that are good for nests, too.You can make a collection box of things to leave for birds so they can help themselves. Hang asmall plastic box with holes on a tree branch. Fill the box freely with nest building goodies. Hangthe box on a tree and watch birds climb on board to pick through the junk to find their treasures.Warning: Don’t let the birds turn into a tasty treat. Keep your bird station away from placeswhere cats hang out.For The Birds!Stop! Don’t throw all that garbage out! Give some to the birds. Look and see how your oldjunk can help beautify and warm a bird’s new home.51. The baby birds with warm homes are able to _____.A. choose right objectsB. leave the nests soonerC. build good nestsD. learn to fly higher52. What can people make for birds to build nests?A. Holes on the tree.B. Food out of the rubbish.C. A warning board.D. A collection box of things.53. What can we learn from the passage?A. Birds build nests to store things.B. Birds regard white objects as cotton.C. Birds and humans can help each other.D. Birds and cats fight against each other.五、完形填空（共12分，每小题1分）On April 5,1971, the government of China asked the government of the United States this question. "Would the U.S. table tennis team like to 36 a week competing in pingpong games in China?" The answer was yes! For 20 years, Americans had not been allowed to 37 the land of China.The 15 members of the U. S. pingpong team did not know much about the country they were to visit. They had little 38 about the land or the population of China. Even so they found it different from what they 39 ! They had thought the people of China would be 40 and unfriendly. Instead, there were friendly Chinese everywhere waving and smiling.Never before had a sport become such a powerful instrument of 41 and friendship between two nations! The United States and China had been completely out of 42 with each other for many years. The visit of the American pingpong team to China brought about new efforts at communication 43 the two countries. The Chinese have 44 been the world table tennis champions(冠军), and they won most of the games. But who won the pingpong competition was not as 45 as the new friends that were 46 . "Winning doesn't 47 ," one of the Chinese players said, "but friendship does!"36. A. take B. pass C. use D. spend37. A. enter B. understand C. talk about D. get on38. A. question B. problem C. worry D. information39. A. imagined B. wanted C. had expected D. had seen40. A. foolish B. cold C. warm D. proud41. A. people B. sports C. war D. peace42. A. war B. touch C. trouble D. question43. A. of B. to C. between D. for44. A. never B. long C. always D. not45. A. many B. clear C. important D. special46. A. made B. known C. found D. met47. A. last B. exist C. develop D. mind书面表达英语校刊上刊登了学生会(The Student’s Union) 发出的倡议书“Write to your teacher”。
四年级英语下册第三单元试卷及答案
料四年级英语下册第三单元试卷姓名_____________听力部分（30分）一、听录音，选出你所听到的单词或短语。
（10分）（）1. A. thirty B. twenty C. usually（）2. A. homework B. home home（）3. A. when B. where C. who（）4. A. after school B. afternoon C. in the afternoon（）5. A. have lunch B. have dinner C. have breakfest （）6. A. match B. lunch C. watch（）7. A. go home B. go to bed C. go home（）8. A. nine B. night C. nice（）9. A. play football B. play basketball C. timetable （）10. A. 5:50 :55 C. 5:15二、听录音，根据所听到的顺序，给下列图片标号。
（10分）( ) ( ) ( ) ( ) ( )( ) ( ) ( ) ( ) ( )三、听录音，选出正确的答句。
（5分）( ) 1. A. At seven thirty. B. I have seven. C. It’s seven.( ) 2. A. I have Chinese. B. It’s a big TV. C. She is Miss Li.( ) 3. A. At six. B. Six. C. It’s six o’clock.( ) 4. A. Yes, it is. B. Yes, she does. C. Yes, I do.( ) 5. A. No, thank you. B. No, it isn’t. C. Sorry, I don’t know.四、听录音，将对话补充完整。
六年级英语下册unit3单词
六年级英语下册unit3单词全文共3篇示例，供读者参考篇1Unit 3 in the sixth grade English textbook covers a variety of new words that students need to learn and understand. In this unit, students will be introduced to vocabulary related to sports, hobbies, and activities. Let's take a look at some of the key words in Unit 3:1. Practice: the act of repeating an activity or exercise regularly in order to improve or maintain one's skills. For example, "I practice basketball every day after school."2. Competition: a contest or rivalry between two or more individuals or teams. For example, "The soccer competition was intense, but our team won in the end."3. Athlete: a person who participates in sports or other physical activities. For example, "She is a talented athlete who excels in both swimming and running."4. Challenge: a difficult task or problem that tests one's abilities. For example, "Climbing the mountain was a real challenge, but I managed to reach the top."5. Tournament: a series of games or matches in which a number of teams or individuals compete to determine a winner. For example, "The tennis tournament is held every year in our city."6. Hobby: an activity done for pleasure in one's leisure time. For example, "My hobby is painting, and I love to create beautiful artworks."7. Skill: the ability to do something well, usually as a result of training or practice. For example, "She has excellent cooking skills and can make delicious meals from scratch."8. Victory: the act of defeating an opponent or winning a game or competition. For example, "Our team celebrated our victory with cheers and high-fives."9. Exercise: physical activity done to improve health and fitness. For example, "I do aerobic exercises every morning to stay in shape."10. Teamwork: the collaborative effort of a group of individuals to achieve a common goal. For example, "Teamwork is essential in basketball, as players need to work together to win games."Learning these words and their meanings will help students better understand and communicate about sports, hobbies, and activities. By practicing these words in sentences and conversations, students will be able to use them confidently in everyday situations. So, let's start studying Unit 3 vocabulary and have fun exploring the world of sports and hobbies!篇2Unit 3 of the sixth-grade English textbook covers a variety of important vocabulary words that students need to learn and understand. In this unit, students will learn words related to family, daily routines, and hobbies. Mastering these words will help students improve their English language skills and communication abilities. Let's take a closer look at the key vocabulary words from Unit 3.Family-related words:1. Parents: (noun) a person's mother and father.Example: My parents are both doctors.2. Siblings: (noun) brothers and sisters.Example: I have two siblings, one brother, and one sister.3. Relatives: (noun) family members.Example: I have a lot of relatives coming over for dinner tonight.Daily routine words:1. Wake up: (verb) to stop sleeping and become conscious.Example: I wake up at 7:00 AM every morning.2. Brush teeth: (verb) to clean your teeth with a toothbrush.Example: I brush my teeth after every meal.3. Homework: (noun) schoolwork that students do at home.Example: I have a lot of homework to do tonight.Hobbies:1. Read: (verb) to look at and understand the meaning of written or printed words or symbols.Example: I love to read books in my free time.2. Draw: (verb) to produce a picture by making lines and marks.Example: I like to draw pictures of animals.3. Play sports: (verb) to participate in physical activities for fun or competition.Example: I play sports with my friends every weekend.By learning and practicing these vocabulary words from Unit 3, students will be able to enhance their speaking, listening, reading, and writing skills in English. Mastering these words will help students communicate effectively in various situations and build their confidence in using the English language. Students should regularly review and practice these words to ensure they remember and understand them well. Good luck with your studies!篇3Unit 3 in the sixth-grade English textbook covers a wide range of vocabulary words that are essential for students to learn and understand. These words are important for building a strong foundation in the English language and will help students communicate effectively in both written and spoken forms. In this article, we will explore each word in Unit 3 and provide examples of how they can be used in sentences.1. celebrate - (v.) to honor or show appreciation for something through a special act or event- We will celebrate my birthday with a big party next weekend.2. custom - (n.) a traditional way of behaving or doing something that is specific to a particular society or group- It is a custom in my family to exchange gifts on Christmas Day.3. event - (n.) something that happens, especially something important or notable- The school will hold a special event to celebrate World Environment Day.4. fireworks - (n.) objects that explode to produce bright lights and loud noises in the sky, used in celebrations- We watched the fireworks display on New Year's Eve.5. national - (adj.) relating to or characteristic of a nation; common to a whole country- The national flag represents our country's identity.6. parade - (n.) a public procession, especially one celebrating a special day or event- We watched the parade on Independence Day.7. symbol - (n.) a thing that represents or stands for something else, especially a material object representing something abstract- The dove is a symbol of peace.8. anniversary - (n.) the date on which an event took place ina previous year- My parents will celebrate their 25th wedding anniversary next month.9. gift - (n.) something given willingly to someone without payment; a present- I received a beautiful gift on my graduation day.10. global - (adj.) of or relating to the whole world; worldwide- Pollution is a global problem that affects everyone.In conclusion, learning the vocabulary words in Unit 3 will help students improve their language skills and increase their ability to communicate effectively in English. By using these words in sentences and practicing their pronunciation, students can enhance their understanding and mastery of the English language.。
homework3答案
作业三 答案1．The firm chooses its labor input d N so as to maximize profits. When there is no subsidy, profits for the firm are given by(,).d dzF K N wN π=- That is, profits are the difference between revenue and costs. In the top figure on the following page the revenue function is (,)d zF K N and the cost function is the straight line, d w N . The firm maximizes profits by choosing the quantity of labor where the slope of the revenue function equals the slope of the cost function:.N M P w =The firm’s demand for labor curve is the marginal product of labor schedule in the bottom figure below. With an employment subsidy, the firm’s profits are given by:(,)()d d zF K N w s N π=--where the term (,)dzF K N is the unchanged revenue function, and ()d w s N - is the cost function. The subsidy acts to reduce the cost of each unit of labor by the amount of the subsidy, s.In the left figure below, the subsidy acts to shift down the cost function for the firm by reducing its slope. As before, the firm will maximize profits by choosing the quantity of labor input where the slope of the revenue function is equal to the slope of the cost function, (t – s), so the firm chooses the quantity of labor where .N M P w s =-In the right figure below, the labor demand curve is now ,N MP s + and the labor demand curvehas shifted up. The subsidy acts to reduce the marginal cost of labor, and the firm will hire more labor at any given real wage.2. The consumer faces a borrowing constraint that places a ceiling on the level of current consumption. The consumer may consume more than the current endowment, y , but less than the amount of the lifetime endowment, we . The consumer’s budget line is as in the first figure below. The budget line becomes vertical at c x y =+ An example of such a budget line is depicted in the two panels of the figure as ABD, where ',1y D y y r ⎛⎫∈+ ⎪+⎝⎭. As one possibility, the constraint is nonbinding as in the figure below. The consumer chooses point H. A change in the level of x has no effect on such a consumer. Alternatively, the consumer depicted in the second figure below originally chooses the corner solution, point B. The consumer achieves the level of utility corresponding to indifference curve, 1I . An increase in x produces the new budget line,ACJ. This consumer now chooses point G . She increases current consumption and decreases both current saving and future consumption. This consumer is able to improve her level of utility to that corresponding to indifference curve, 2I .3. When the government impos es a proportional tax on wage income, the consumer’s budget constraint is now given by:(1)(1)C w l t =--. In the figure below, the budget constraint for 0t =, is FG(neglect part GH). When t > 0, the budget constraint is EG . The slope of the original budget line is –w, while the slope of the new budget line is –(1 – t)w. Initially the consumer picks the point A on the original budget line. After the tax has been imposed, the consumer picks pointB.The substitution effect of the imposition of the tax is to move the consumer from point A to point D on the original indifference curve. The point D is at the tangent point of indifference curve, 1I , with a line segment that is parallel to EG . The pure substitution effect induces the consumer toreduce consumption and increase leisure (work less).The tax also makes the consumer worse off, in that he or she can no longer be on indifference curve, 1I , but must move to the less preferred indifference curve, 2I . This pure income effectmoves the consumer to point B, which has less consumption and less leisure than point D, because both consumption and leisure are normal goods.The net effect of the tax is to reduce consumption, but the direction of the net effect on leisure is ambiguous. The figure shows the case in which the substitution effect on leisure dominates the income effect. In this case, leisure increases and hours worked fall. Although consumption must fall, hours worked may rise, fall, or remain the same.。
Homework 3
Homework
Ⅰ1.A lot of e-mails have been written on the computer (by us) in the past years. 2.As the years have gone by, computers have been made smaller and smaller (by us). 3.All the preparations for the project have been completed (by us), and we’re ready to start. 4.When and where to go for the on-salary holiday has not been decided yet (by us).
Page 52 Ⅴ1. C
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Ⅰ.1.deal with 3.With the help of 5.so … that 7.from then on 9.in a way Ⅱ. 1.A 2.D 3.D Ⅲ. 1.C 2.B 3.A
2.After all 4.went by 6.as a result 8.make full use of 10.watching over 4.C 5.B 6.B 4.C
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Ⅱ1.①随便; 杂乱无章地 ②无论如何；不管怎样 √③总之; 反正(继续讲述故事或改变话题时使用)
2. ①涉及；谈及；讨论 √②处理；应付 ③与……相处；与……打交道 ④与……做交易
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3. ①组成；构成 ②弥补 √ ③编；编造 ④化妆 2.watch over Ⅲ1.with the help of 3.arise from 4.personally (speaking) 5.win (the) first place 6.signal to sb 7.in reality 8.have a good shot for a goal 9.from … on 10.develop a new type of program Ⅳ1. signaled to sb 3.arising from 5.in reality 2.With the help of 4.watch over 6.has won (the) first place 2.A 3.B 4.A 5.D
四年级上册英语三单元作业设计
主题：四年级上册英语三单元作业设计一、看图选单词1. 描述：在这一部分，学生将会看到一幅图画，然后根据图画的内容选择相对应的英语单词。
图画内容将涉及到日常生活中的常见场景，如家庭、学校、购物等。
2. 目的：通过此活动，学生能够运用所学的英语词汇，培养对图画内容的理解和表达能力。
二、完成句子1. 描述：学生将会在此部分完成若干个句子，句子内容将和学校生活、家庭生活、日常活动等相关。
2. 目的：通过此活动，老师可以检验学生对所学知识的运用能力，同时巩固学生的语法和句子构成能力。
三、阅读理解1. 描述：在这一部分，学生将会阅读两到三个简短的阅读材料，然后回答相关问题。
阅读材料将涉及到日常生活中的相关话题，如关于动物、家庭、节日等。
2. 目的：通过此活动，学生将能够培养对英语阅读材料的理解和解答问题的能力，同时扩大学生的英语词汇量。
四、问答互动1. 描述：在这一部分，学生将会根据老师提出的问题进行回答，问题内容将和英语三单元的学习内容相关。
2. 目的：通过问答互动，老师可以检验学生对所学知识的掌握程度，并对学生的口语表达能力进行训练和提高。
五、作文1. 描述：学生将会在此部分完成一篇短文，短文内容将是关于自己的家庭、日常生活或者上学生活的介绍。
2. 目的：通过此活动，学生将能够培养对写作的兴趣，提高英语写作表达能力，同时锻炼学生的组织和表达能力。
六、补充题目1. 描述：在这一部分，老师可以根据需要自行设计一些补充题目，如听力测试、口语表达等，以巩固学生的英语学习成果。
2. 目的：补充题目的设计能够全面检验学生的英语听说读写能力，为学生的英语学习提供更全面的评估。
以上是四年级上册英语三单元作业设计的详细内容，通过这份设计，我们可以有效地检验学生对英语知识的掌握情况，培养学生的英语学习兴趣，同时提高学生的英语表达能力。
希望这份作业设计能够帮助学生在英语学习中取得更好的成绩。
三单元部分英语续写一、看图选单词3. 实施：在此部分，教师将为学生呈现一系列的图片，每张图片上都描述了一个日常生活中的场景或活动。
四年级下册英语一课一练- Unit 4 At the farm Part A(三课时 含答案解析)人教PEP版
人教PEP版英语四年级下册一课一练Unit 4 Part A第一课时一、根据对话判断图片正(T)误(F)。
( )1．-Are these apples?-No, they aren't.( )2．- Are these carrots?-Yes, they are.二、给下列问句选择正确的答语。
1. -What is that?-_________2. -What are they?-________A. They are nice.B. It's a carrot.C. They are potatoes.D. It's a carrots.三、看图仿写句子。
示例: 1. 2. 3.例：-What are these?-They are watermelons.1.-__________ -__________2.-__________ -__________3.-__________ -__________四、按要求选择正确答案。
( )1．They're tomatoes.(对画线部分提问) A．What are they?B．Where are they?( )2．They are green.（对画线部分提问）A．What colour are they?B．What time is it?( )3．Are these carrots?（做否定回答）A．Yes, they are.B．No, they aren't.( )4.This is an apple.（改为复数形式）A．These are apples.B．Those are apples.( )5．它们真大！（汉译英）A．It's so big.B．They're so big.五、选择正确的选项补全对话。
Amy: Look! 1.______Mike: Guess.Amy: 2.______Mike: No, they aren't.3.______Amy: Oh! Are these strawberries?Mike:4.______ Try some, please.Amy: 5.______B. potatos; tomatosC. potatoes; tomatoes( ) 4. I like tomatoes, but I ____like onions.A. don'tB. isn'tC.not四、选词填空。