Al-Cu aluminium alloys The aluminium–copper(2000series)alloys are the primary alloys used in airfrae structural applications where the main design criterion is damage tolerance. The2000series alloys containing magnesium have higher strength resulting from the precipitation of Al2Cu and Al2CuMg phases and superior damage tolerance and good resistance to fatigue crack growth compared to other series of aluminium alloys.
The7000series of aluminium alloys show higher strength when compared to other classes of
Title：
Recent developments in advanced aircraft aluminium alloys
Source：
Materials and Design56(2014)862–871
SCI:IF=4.364
Authors：
Tolga Dursun,Costas Soutis
I have to admit that I fail to get the detail information of the two author,though both of them are very famous.They’ve published nearly500articles in material field,several of which bring big significance to this area of research.The review I choose has been cited for199times until now,which will certainly go up because it was published just in2014.
Introduce:
The cost reduction for aircraft purchase and operation has become a driving force in many airline companies.And weight reduction can improve fuel consumption, increase payload and increase range.
Aluminium alloys,which is light,have been the primary structural material for commercial and military aircraft for almost80years due to their well known mechanical behaviour,easiness with design,mature manufacturing processes and inspection techniques,and will remain so for some time to come.
This review article covers the latest developments related to aluminium alloys used as aircraft primary structures and highlights performance improvements in the2000, Al–Li alloys,Al–Zn alloys and Al–Cu alloys.The advantages and disadvantages of the joining techniques,laser beam welding and friction stir welding,are also discussed.
材料科学与工程学院17S109277白松义
Al-Zn aluminium alloys aluminium alloys and are selected in the fabrication of upper wing skins,stringers and horizontal/vertical stabilizers.The compressive strength and the fatigue resistance are the critical parameters in the design of upper wing structural components.The tail of the airplane,also called the empennage,consists of a horizontal stabilizer,a vertical stabilizer or fin,and control surfaces e.g.elevators and rudder.Structural design of both the horizontal and vertical stabilizers is essentially the same as for the wing.Both the upper and lower surfaces of the horizontal stabilizer are often critical in compression loadingdue to bending.
Al-Li aluminium alloys
Reducing the density of materials is accepted as the most effective way of lowering the structural weight of aircraft.Li(density0.54g/cm3)is one of the few elements that have a high solubility in aluminium.This is significant because,for each1% added,the density of an aluminium alloy is reduced by3%.Lithium is also unique amongst the more soluble alloying elements in that it causes a considerable increase in the elastic modulus(6%for each1%Li added).Additional advantage is that, aluminium alloys containing Li respond to age hardening.
Joining techniques Joints produced by FSW have higher strengths than
riveted joints and much lower residual stresses than
typical fusion welded joints.In welding7000series
aluminium alloys,post weld ageing is necessary to
stabilise the microstructure in the friction stir welded
regions.The selected overaging treatments also
improve corrosion resistance of these alloy. Conclurion:
Aluminium alloys have been the primary material for the structural parts of aircraft for more than80years because of their well known performance,well established design methods,manufacturing and reliable inspection techniques.Nearly for a decade composites have started to be used more widely in large commercial jet airliners for the fuselage,wing as well as other structural components in place of aluminium alloys due their high specific properties,reduced weight,fatigue performance and corrosion resistance.Although the increased use of composite materials reduced the role of aluminium up to some extent,high strength aluminium alloys remain important in airframe construction.Aluminium is a relatively low cost, light weight metal that can be heat treated and loaded to relatively high level of stresses,and it is one of the most easily produced of the high performance materials,
which results in lower manufacturing and maintenance costs.There have been important recent advances in aluminium aircraft alloys that can effectively compete with modern composite materials.This study covers latest developments in enhanced mechanical properties of aluminium alloys,and high performance joining techniques.The mechanical properties on newly developed2000,7000series aluminium alloys and new generation Al–Li alloys are compared with the traditional aluminium alloys.
Future:
It is believed that developments of advanced hybrid materials,like fibre metal laminates could provide additional opportunities for aluminium alloys and new material options for the airframe industry.
Relevence to my study：
Actually speaking,there is no direct relation to my study.Now I’m conducting two project,one of which is on Al diffusion welding.I chose this review just for make it clear in my mind what categories Aluminum alloys are divided into.
大学英语1考试卷 总分：100分 简答题 1、将下列句子翻译成汉语 1.We can do a lot of things onlinesuch assearching for information and communicating with friendsno matter how far.答案：我们可以在网上做很多事情，例如寻找信息及和朋友沟通，不管相距多远。 2.Some people seem tohave their own ability in learning language答案：有些人在学习语言方面似乎有自己的天赋. 3.It is necessary for them to learn the language in order to communicate with these people and to learn from them.答案：为了与这些人进行交流，向他们学习，学习这门语言是必要的 4.Our likes and dislikes, tastes and preferences that hide in our choices of such activities such as reading books, going to the cinema, camping, or certain cultural pursuits, are all related to social background and learning experiences.答案：我们的好恶、品位、喜好决定了我们是选择看书、看电影、露营或某种文化追求，这又同社会环境和学习经验有关。 5.Occasionally, for a formal party or dinner, an invitation requires an answer,either in writing or by telephone. 答案：偶尔,一个正式的聚会或晚宴, 被邀请人是需要做出明确答复的, 无论是通过书面或者电话. 选择性答案2：应邀出席正式宴会或晚餐，不管是用书面还是用电话，有时是要回复的。（意思差不多，哪个通顺写哪个吧） 6.They not only like playing or watching games, but also like talking about them, or even thinking about them. 答案：他们不仅喜欢玩游戏、看游戏，而且喜欢谈论和思考它们。 7.There are plenty out there that are good and plenty that are bad. 答案：那里有很多是好的，很多是坏的。 8.Yet putting off something we know we should do is a bad habit to get into. 答案：然而，拖延我们知道应该做的事就会染上一个坏习惯。 9.And don’t you feel stressed and worried when you have to hurry?
专业英语大作业 一：英译汉 翻译范围TCP/IP Illustrated, V olume 1: The Protocols 5.1~5.5 15.1~15.2 第5章RARP：逆地址解析协议 5.1简介 5.2 RARP报文格式 5.3 RARP示例 5.4 RARP服务的设计 5.5小结 练习 5.1简介 一个拥有本地磁盘的系统通常是从磁盘文件读取配置文件中获取其IP地址。但一个没有磁盘的系统，如X终端或无盘工作站，需要一些其它方式去获得其IP地址。 每个系统在网络上都有一个唯一的硬件地址，由网络接口的制造商分配。 RARP的原则是无盘系统从接口卡上读取其独特的硬件地址，并发送RARP请求（网络上的广播帧）要求别人对无盘系统的IP地址（使用RARP回应）进行应答。 虽然这个概念很简单，执行往往比ARP更难，在本章后面会描述其原因。 RARP的正式规范是RFC 903。 5.2 RARP报文格式 RARP报文的格式几乎与ARP报文是相同的（图4.3）。唯一的区别是，RARP 的请求或应答帧类型为0×8035，并且在操作层RARP请求值为3、RARP应答值为4。 图4-3 ARP在网络上请求与应答报文的格式 与ARP一样，RARP服务器请求是广播和RARP应答通常是单播。 5.3 RARP示例 在我们的网络，我们可以强制sun主机从网络引导，而不是它的本地磁盘。 如果我们在主机bsdi上运行RARP服务器和tcpdump，我们得到如图5.1所示的输出。我们使用-e参数去标记tcpdump的打印硬件地址：
图5.1 RARP请求和应答。 该RARP请求是广播（1号线）的，第2行的RARP应答是单播的。第2行的输出，“at sun”,意味着RARP应答包含了主机sun（140.252.13.33）的IP地址。 在第3行，我们看到，一旦sun接收其IP地址，它会发出一个TFTP读请求（RRQ）的文件8CFCOD21.SUN4C。（TFTP是简单文件传输协议，我们在第15章进行详细描述）。在文件名中的8个十六进制数字是sun主机的IP地址140.252.13.33的十六进制表示形式。这是在RARP应答中返回的IP地址。该文件名的其余部分，后缀SUN4C表示系统正在引导的类型。 Tcpdump表示第3行是一个长度为65的IP数据报，而不是一个UDP数据报（实际上它确实是），因为我们运行tcpdump命令使用-e参数，看硬件级别的地址。另一点，在图5.1要注意的是在第2行的以太网帧的长度似乎比最小较短（我们所说的是在4.5节60字节）。原因是我们的系统，该系统上运行的tcpdump 发送该以太网帧（BSDI）。该应用程序rarpd，写42字节到BSD分组过滤器装置（14字节的以太网报头和28字节的RARP应答），这是什么的tcpdump收到的副本。但以太网设备驱动程序垫这个短帧的最小尺寸为传输（60 ）。如果我们在另一个系统上已经运行的tcpdump ，长度会是60。 我们可以看到在这个例子，当这种无盘系统接收在RARP应答它的IP地址，它会发出一个TFTP请求来读取一个引导映像。在这一点上，我们不会进入其他详细介绍无盘系统是如何引导自己。（第16章介绍了使用RARP ，BOOTP和TFTP无盘X终端的引导顺序。） 图5.2表示出了如果有在网络上没有RARP服务器所得到的数据包。每个数据包的目的地址为以太网的广播地址。以太网地址跟随的是目标硬件地址，并按照发送端的硬件地址发送。
全国农业推广硕士专业英语作业题 Part One Vocabulary and Structure Fill in the balnks with words or expressions chosen from the following list. Change the form where necessary. speculate specify commitment despite desirable access contribution adolescent banish inhabitant identify frustration impact sanction impressive hit upon switch correspond to obligation various 1、The U.N would impose economic against the offending nations or government. 2、The boys and girls are fond of behaving differently from seniors. 3、I a satisfactory explanation. 4、Man on the origin of the universe since the beginning og the human history. 5、You can from your mind the idea of holding a party during
the examination week. 6、The company that we would have one subject to another. 7、The American Congree the British Parliament. 8、We are trying to find some people who have a real sense of to the job. 9、the sandstorm, the Johnsons drove to the xilla to celebrate their 25th anniversary of marriage. 10、You are under no to pay for goods which you did not order. 11、Men still hold the vast majority of the least- or modt-dangerous jobs, such as loggers and miners. 12、He doesn’t expect to see changes overnight. 13、Students must have to good books.
10108 大学英语（B） 一、单选题 What is NOT mentioned in US education system?（B） 选择一项： A. major courses B. teaching methods C. self-discipline of the students D. comparison with Chinese students 2.Which of the following statements is TRUE?（C） 选择一项： A. There are fewer and fewer universities and private colleges in America. B. The academic advisor is in charge of the student's living conditions. C. Required core classes are taken in the first school year. D. The student must stick to his majors throughout his college time. 3.About the courses in US colleges, which of the following is NOT TRUE?（C） 选择一项： A. Subjects of arts, sciences and languages are taken by most first year students. B. There are a number of other courses for students to choose from besides their major ones. C. Students would still get certain credits if they do not attend the courses. D. A typical course load means the credits of courses a student has for one semester. 4.If students have problems in finding jobs, they can turn to _____ for help.（B） 选择一项： A. academic advisors B. the Career Counseling and Placement Office C. some fraternities D. no organization 5.The successful college students probably are the following EXCEPT______.（A） 选择一项： A. self-centered B. active members of society during school C. members of some fraternities D. those who know how to control themselves 6.The fact that wife beating was legal in America in 1850 shows that ____C______. 选择一项： A. America's legal system was in favor of the husband B. American husbands didn't love their wives C. American wives were servants to their husbands
《自动化专业英语》翻译大作业 所选文字出处：选自论文《PLC的发展和应用》 班级：学号：姓名：成绩： PLC全名为可编程控制器，定义是种数字运算操作的电子系统，专为在工业环境应用而设计的，主要结构由电源，中央处理单元，存储器，输入输出接口电路，功能模块，通信模块组成。PLC具有通用性强、使用方便、适应面广、抗干扰性强、编程简单等特点，在军事、国防、航空航天、交通、工业生产中的地位，在可预见的将来中是无法取代的。PLC有很多流派，我国的PLC研发、生产和应用发展很快，尤其在应用方面更为突出。 PLC的发展历程和主要流派 在工业生产过程中，大量的开关量顺序控制，它按照逻辑条件进行顺序动作，并按照逻辑关系进行连锁保护动作的控制，及大量离散量的数据采集。传统上，这些功能是通过气动或电气控制系统来实现的。1968年美国GM（通用汽车）公司提出取代继电气控制装置的要求，第二年，美国数字公司研制出了基于集成电路和电子技术的控制装置，首次采用程序化的手段应用于电气控制，这就是第一代可编程序控制器，称Programmable Controller（PC）。个人计算机（简称PC）发展起来后，为了方便，也为了反映可编程控制器的功能特点，可编程序控制器定名为Programmable Logic Controller（PLC），现在，仍常常将PLC简称PC。PLC的定义有许多种。国际电工委员会（IEC）对PLC的定义是：可编程控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存贮器，用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于与工业控制系统形成一个整体，易于扩充其功能的原则设计。上世纪80年代至90年代中期，是PLC发展最快的时期，年增长率一直保持为30~40%。在这时期，PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，PLC逐渐进入过程控制领域，在某些应用上取代了在过程控制领域处于统治地位的DCS系统。在世界上200多家PLC厂商，400多品种的PLC产品大体可以按地域分成三个流派：一个流派是美国产品，一个流派是欧洲产品，还有一个流派是日本产品。同一地区的产品相互借鉴的比较多，相互影响比较大，技术参透比较深，面临的主要市场相同，拥护要求接近，这一切就使得同一地域的PLC产品表现出比较多的相似性。美国PLC技术的形成与欧洲PLC技术的形成是在相互隔离的情况下，独自研究开发获得的，因此美国的PLC产品与欧洲的PLC产品常表现出来明显的差异性。日本的PLC技术是由美国引进的，因此日本的产品对美国的产品有一定的继承性。世界上比较先进的PLC生产厂家有德国的的西门子、日本的三菱、美国的A-B公司等等。
1、A VPN is physically public but virtually private 2、Set is a secure protocol jointly designed by Mastercard and Visa with the backing of Microsoft, Netscape, IBM, GTE, SAIC, and other companies. 3、 The physical components of a computer are collectively called hardware 4、The term payment card refers to Credit card 、Charge card 5、The fifth generation computers, with artificial intelligence,are being developed and perfected now. 6、In the future, we may eliminate the needs for physical money.Indeed ,we would exchange digital cash For goods and services. 7、The basic input device on a small computer is a keyboard 8、You must have seen her in her office last Friday; she's been out of town for two weeks. 9、The ability to store knowledge makes computers different from every other machine ever invented. 10、The fifth generation computers, with artificial intelligence,are being developed and perfected now. 11、DigiCash or E-cash is an electronic payment system developed by Dr.David Chaum, who is widely regarded as an inventor of digital cash. 12、Transaction changed to your telephone bill are called E-charge payments 13、Smart cards are cards that look like credit cards, but store information on a microprocessor chip instead of magnetic strips. 14、https://www.doczj.com/doc/6e2323125.html, is a free service that earns a profit on the transaction cost, which is money that is deposited in PayPal accounts 15、This ticket entitles you to a free meal in our new restaurant 16、Program that can destroy another computer’s programs are called viruses 17、Data and program instructions are stored in storage 18、Electronic wallets that store digital certificates are particularyly handy when you shop at a site that requests user authentication information. 19、The percentage of times an ad is clicked on based on the number of times it’s viewed is called CTR 20、The purpose of input device is to enter commands .、to input data
1、(5) Which of the following is not true? ADick stayed at a nice hotel in the center of the city. BDick didn't work on the first night of his arrival. CDick forgot to send his wife a telegram. DDick wanted to go back to his hotel in a taxi. 正确答案C 2、题目Reading comprehension 1(4) Who would send him the name and address of his hotel? AThe manager of his hotel. BThe police office. CThe taxi driver. DHis wife.
正确答案D 3、题目Reading comprehension 1(3)Where did Dick stay in New York? A In the center of the city. BIn a hotel. CIn a restaurant. DAt his friend's house. 正确答案B 4、题目Reading comprehension 1(2) Why did his wife want a telegram from him? ABecause she didn’t know his address yet
BBecause she wanted to go to New York, too CBecause she might send him another telegram DBecause she couldn't leave her husband by himself in New York. 正确答案A 5、1) Dick flew to New York because _________. Ahe went there for a holiday Bhe had work there Che went there for sightseeing D his home was there 正确答案B
大学英语三离线作业答 案 Document serial number【NL89WT-NY98YT-NC8CB-NNUUT-NUT108】
离线作业试卷列表2 一、单选? 1.第一部分：交际用语（共5小题；每小题3分，满分15分）- Would you be interested in seeing a film tonight- ____C______?分值：3 A. Not at all.??? B. Are you sure??? C. Great! I'd love to ??? D. You're welcome.???? 2.第一部分：交际用语（共5小题；每小题3分，满分15分）- Excuse me, could you tell me the way to P eople's Square- ____B______?分值：3 A. I don't understand you.??? B. Sorry, I'm a stranger here.??? C. Why don't you take a taxi??? D. Don't bother me.???? 3.第四部分：完形填空（共10小题；每小题1分，满分10分）30?C 分值：1 A. on mind??? B. in heart??? C. in mind??? D. on your mind???? 4.第四部分：完形填空（共10小题；每小题1分，满分10分）29 B?分值：1 A. with??? B. for??? C. to??? D. in???? 5.第四部分：完形填空（共10小题；每小题1分，满分10分）28 B?分值：1 A. impossible??? B. wonderful??? C. incapable??? D. practical???? 6.第一部分：交际用语（共5小题；每小题3分，满分15分）- I've got the first prize in the dancing ____C______?分值：3 A. You're welcome.??? B. It's very kind of you.??? C. Please accept my congratulations.??? D. Oh, really, I can't believe my ears.???? 7.第一部分：交际用语（共5小题；每小题3分，满分15分）- I've passed the ___D_______?分值：3 A. What a pity!??? B. I have the examination.??? C. Come on.??? D. Congratulations.???? 8.第一部分：交际用语（共5小题；每小题3分，满分15分）- I'm suffering from a ________A__?分值：3
1. 获取更多信息如摘要的格式和类别,请参考附上的“提交摘要说明”。 For more information such as the format and the categories of the abstract, please refer to the attached “Instructions for Submission of Abstracts”. 2. 随信寄上两份论文摘要和一份个人简历，请查收。请便中告知我是否有资格申请大会的资助。 We are enclosing two copies of paper and a resume, please check. Please inform me if there are eligible to apply for funding of the conference. 3.非常感谢你的信息和对GEC2004感兴趣。不幸的是我们对参与者不提供任何财务援助。对组织会议有很大帮助的人将会提供一些金融帮助,例如给主题演讲或教程,组织一个邀请会话等。 Thank you very much for your message and for your interest in GEC2004. Unfortunately we can’t offer any financial assistance for regular participants. There will be some financial help available only for people who give considerable help in organizing the conference, e.g. giving a keynote lecture or a tutorial, organizing an invited session, etc. 4. 感谢你的8月15日来信，邀请我去参加2003年1月25日至28日在密歇根州的Bellaire即将举行的“2003国际会议比较文学”。
Abstract: In the modern society, database technology is developing rapidly, and the data information contained therein is also increasing. In the process of enterprise operation, the database system is gradually being widely applied to daily information management, which is to effectively organize and utilize the massive information in the database through relevant technical means to help relevant data owners find valuable information and knowledge. Guide the development planning of the enterprise and improve the operational efficiency of the enterprise. This has become one of the hot topics of current e-commerce industry operators, and data mining technology can help e-commerce operators solve such problems. Data mining is a comprehensive use of related technologies such as artificial intelligence and natural language understanding. The purpose is to extract useful and valuable information or patterns from large amounts of data. This topic first analyzes and summarizes the research results of scholars at home and abroad, and makes a preliminary understanding of the application of data mining in e-commerce. Then it expounds the methods of data mining and e-commerce concepts and data mining. This paper also uses theoretical analysis and Case studies and other research methods, as well as questionnaire surveys of employees from different enterprises, fully discuss the difficulties in data mining technology in the field of e-commerce, the difficulties in the process of promotion, and the related methods to solve the bottleneck of e-commerce development. Research, in this way to explore the convergence of e-commerce development and data mining, and comprehensively promote the application of technological innovation. Through the research of this paper, we have an understanding of the application status of data mining technology in e-commerce. The problems and solutions can also provide a good platform for better application of data mining in e-commerce. Keywords: e-commerce; data mining; technical research; 1 Application status and development of data mining technology in e-commerce Data Mining Technology Application Overview: From a macro perspective, data mining technology is conducive to identifying and analyzing user behavior. In a larger depth and breadth, it summarizes users' consumption habits and behavioral preferences, which is beneficial to the subject and object to improve their service methods and product performance. To get a better customer experience and customer satisfaction. Data mining, as a high-level modern technology, has extremely complex logic and computational methods. The internal logic and methods also have different characteristics. According to a survey of 50 employees from different companies, data mining technology is widely used in e-commerce. In 74% of e-commerce, up to 81% of enterprises surveyed use data mining technology. The application of data mining technology in e-commerce is much higher than the percentage I expected. It can be seen that the current application is very wide.
Exercises 1.When and where shall we ___A____. A.meet B. met C. to meet D. meeting A.You __D_____show more respect for your elders. A.can B. could C. would D. must 3. It is necessary that I ___D____ return the books to him tomorrow. A. will B. can C. may D. should 4. She __B_____ to school by school bus at eight in the morning. A. go B. goes C. went D. gone 5. What __C_____the notice say? A. is, say B. is, said C. did, say D. does, say 6. I’ll tell her after Ruby __B____. A. leave B. leaves C. left D. is leaving 7. We __D_____ the result tomorrow. A. know B. knew C. has known D. will know 8. On November 1 we __D_____ in this house for thirty years. A. live B. will have C. are living D. will have been living 9. It __B_____ to rain soon. A. is B. is going C. will D. shall 10. Mary ___C_____ a dress when she cut her finger.
PART1: Reading How to quickly read an English paper? Metalworking Glossary Cutting Tool Engineering, November, 2000, 209-238 The metalworking glossary defines terms common to those who cut and grind metals and other materials. The terms are divided into 11 categories: 1.Manufacturing Definitions; 2.Machining Operations; 3.Machine Tools and Ancillary Equipment; 4.Cutting Tools and Related Terminology 5.Coolants, Lubricants, and Related Terminology 6.Accessories and Attachments; 7.Alloys, Coatings, Material Compositions, and Related Terminology; 8.Heat-treating and Special Processes; 9.Inspection, Measurement, and Quality Control; 10.Robotics and Automated Assembly; 11.Nontraditional Machining How to Make Use of the Linguistic Features of Scientific Papers (科技论文的语言特点) 1.Linguistic Style(语体) 科学技术领域，科技工作者的任务： 描述自然现象 分析自然现象产生的规律 研究自然现象应用于人类生产实践 的方法 表达所取得的成果及其应用 思维形式：概念、公式或公式化的概念 思维活动的语言表达：按照严格的逻辑程序导 出的判断和推理，科技文体具有抽象性、概念 性和高度的逻辑性 内容：写实 语言风格：准确严谨、合乎逻辑，非形象性(理 性)、客观性、无明显感情色彩、简洁明快。Literature 1.Conference paper 2.Journal paper 3.Lecture 4.Book (Dissertation or Thesis) 5.Report (News) 6.Manual and Specification Paper and Experimental Report: Title, Abstract, Introduction, Results and Analysis, Conclusion and Discussion Book & Lecture: Title, Author(s), Name of the process or publisher, Name of the printing House, Name of the distributor, Date of publication, Date of printing, Synopsis, Note by the publisher, International Standard Book Number, Preface or Foreword, Acknowledgements, Contents, Text of the book, Appendix or Supplement, Index, Epilogue Manual and Instructions, Directions: Principle, Operation, Maintenance 2.Vocabulary Typically Professionalized Terms Whenever a force acts on a body so as to make the body move through some distance, it is said to have done work. Body n. 身体, 肉体, 人, 尸体, 主要部分, 团体, 大量vt. 赋以形体 机械专业n. 车身,机身
Unit 1 1.—You speak very good English. — ___________________. A. No, my English is poor B. Don’t say that C. Thank you D. It’s a pleasure 2.— __________ have dinner with me this evening? —Yes. It’s very kind of you. A. Would you like to B. Don’t you like to C. Why don’t you D. Shouldn’t you 3. - I’m afraid Susan’s question made you angry. - ______. If I had been angry, I would have refused to answer. A. Do be afraid B. You are right C. Don’t worry D. Yes, it did 4.－I’m afraid I’ve got a terrible flu. －______________________. A. Never mind B. Keep away from me C. Better go and see a doctor. D. You need to be more careful 5.－It’s cold in here. Do you mind if I close the door?－______________________. A. With pleasure B. Yes, please C. Of course not D. Thank you 6.－I’m going to America for a holiday next week.－______________________. A. Goodbye B. Wish you success C. For sure D. That’s great 7.－Would you like a cup of coffee? －______________________. A. It’s very kind of you. B. No, I wouldn’t C. Yes, please D. Here you are 8. －Haven't seen you for ages. _______ －I've been in California for the past month. A. What are you up to recently? B. How soon will you be back? C. What are you going to do? D. Where did you hide? 9.－Can I borrow your camera for a week?－______________________. A. Sure, here you are B. Yes, you can borrow C. Yes, bring it with you D. It doesn’t matter 10.－Sorry, I have kept you waiting. －______________________. A. That’s all right B. I don’t care C. I’m sad D. No, not at all. Unit 2 1.－Mary, your dress is really beautiful. How is John?－ . A. Thank you very much. B. No, no, John is not bad. C. Thank you. He is fine. D. Don’t say that. It’s ugly. John is good. 2.－Do you mind telling me where you’re from?－ . A. Certainly. I’m from London. B. Sure. I was born in London. C. Not really, you can do it. D. Certainly not. I’m from London. 3.－May I see t he menu, please? I’ve been waiting an hour already.－ . A. That is the menu, sir. B. Yes, please go on. C. Here you are, sir. D. Of course, sir. 4.－I was worried about chemistry, but Mr. Brown gave me an A! － . A. Don’t worry about it. B. Congratulations! That’s a difficult course. C. Mr. Brown is very good. D. Good luck to you! 5.—Did Tom tell you to water the flowers? －___________________. A. No. And so did I B. No. And neither did I C. He did. And so I did D. He did. And so do I 6.—Shall we sit up here on the grass or down there near the water? — _____________. A. I’d rather stay here if you don’t mind B. Sorry, I don’t like neither