2012年12月大学英语六级考试真题
Passage One
Questions 52 to 56 are based on the following passage.
Amid all the job losses, there’s one category of worker that the economic disruption has been good for: nonhumans.
From self-service checkout lines at the supermarket to industrial robots armed with saws and taught to carve up animal bodies in slaughter-houses, these ever-more-intelligent machines are now not just assisting workers but actually kicking them out of their jobs.
Automation isn’t just affecting factory workers, either. Some law firms now use artificial intelligence software to scan and read mountains of legal documents, work that previously was performed by highly-paid human lawyers.
“Robots continue to have an impact on blue-collar jobs, and white-collar jobs are under attack by microprocessors,” says economics professor Edward Leamer. The recession permanently wiped out 2.5 million jobs. U.S. gross domestic product has climbed back to pre-recession levels, meaning we’re producing as much as before, only with 6% fewer workers. To be sure, robotics are not the only job killers out there,
with outsourcing (外包) stealing far more jobs than automation.
Jeff Burnstein, president of the Robotics Industry Association, argues that robots actually save U.S. jobs. His logic: companies that embrace automation might use fewer workers, but that’s still better than firing everyone and moving the work overseas.
It’s not that robots are cheaper than humans, though often they are. It’s that they’re better. “In some cases the q uality requirements are so exacting that even if you wanted to have a human do the job, you couldn’t,” Burnstein says.
Same goes for surgeons, who’re using robotic systems to perform an ever-growing list of operations—not because the machines save money but because, thanks to the greater precision of robots, the patients recover in less time and have fewer complications, says Dr. Myriam Curet.
Surgeons may survive the robot invasion, but others at the hospital might not be so lucky, as iRobot, maker of the Roomba, a robot vacuum cleaner, has been showing off Ava, which could be used as a messenger in a hospital. And once you’re home, recovering, Ava could let you talk to your doctor, so there’s no need to send someone to your house. That “mobile telepresence” could be useful at the office. If you’re away on a
trip, you can still attend a meeting. Just connect via videoconferencing software, so your face appears on Ava’s screen.
Is any job safe? I was hoping to say “journalist,” but researchers are already developing software that can gather facts and write a news story. Which means that a few years from now, a robot could be writing this column. And who will read it? Well, there might be a lot of us hanging around with lots of free time on our hands.
注意：此部分试题请在答题卡2上作答。
52. What do we learn from the first few paragraphs?
A) The over-use of robots has done damage to American economy.
B) It is hard for robots to replace humans in highly professional work.
C) Artificial intelligence is key to future technological innovations.
D) The robotic industry has benefited from the economic recession.
53. What caused the greatest loss of jobs in America?
A) Using microprocessors extensively.
B) Moving production to other countries.
C) The bankruptcy of many companies.
D) The invasion of migrant workers.
54. What does Jeff Burnstein say about robots?
A) They help companies to revive.
B) They are cheaper than humans.
C) They prevent job losses in a way.
D) They compete with human workers.
55. Why are robotic systems replacing surgeons in more and more operations according to Dr. Myriam Curet?
A) They save lots of money for the patients.
B) They beat humans in precision.（精确度）
C) They take less time to perform a surgery.
D) They make operations less painful.
56. What does the author imply about robotics?
A) It will greatly enrich literary creation.
B) It will start a new technological revolution.
C) It will revolutionize scientific research.
D) It will be applied in any field imaginable.
Passage Two
Questions 57 to 61 are based on the following passage.
You’ve now heard it so many times, you can probably repeat it in your sleep. President Obama will no doubt make the point publicly when he
gets to Beijing: the Chinese need to consume more; they need—believe it or not—to become more like Americans, for the sake of the global economy.
And it’s all true. But the other side of that equation is that the U.S. needs to save more. For the moment, American households actually are doing so. After the personal-savings rate dipped to zero in 2005, the shock of the economic crisis last year prompted people to snap shut their wallets.
In China, the household-savings rate exceeds 20%. It is partly for policy reasons. As we’ve seen, wage earners are expected to care for not only their children but their aging parents. And there is, to date, only
the flimsiest (脆弱的) of publicly-funded health care and pension systems, which increases incentives for individuals to save while they are working. But China is a society that has long esteemed personal
financial prudence (谨慎). There is no chance that will change anytime soon, even if the government creates a better social safety net and successfully encourages greater consumer spending.
Why does the U.S. need to learn a little frugality (节俭)？Because heal thy savings rates are one of the surest indicators of a country’s
long-term financial health. High savings lead, over time, to increased investment, which in turn generates productivity gains, innovation and job growth. In short, savings are the seed corn of a good economic harvest.
The U.S. government thus needs to act as well. By running constant deficits, it is dis-saving, even as households save more. Peter Orszag, Obama’s Budget Director, recently called the U.S. budget deficits unsustainable and he’s right. To date, the U.S. has seemed unable to see the consequences of spending so much more than is taken in. That needs to change. And though Hu Jintao and the rest of the Chinese leadership aren’t inclined to lecture visiting Presidents, he might gently hint that Beijing is getting a little nervous about the value of the dollar—which has fallen 15% since March, in large part because of increasing fears that America’s debt load is becoming unmanageable.
That’s what happens when you’re the world’s biggest c reditor: you get to drop hints like that, which would be enough by themselves to create international economic chaos if they were ever leaked. (Every time any official in Beijing deliberates publicly about seeking an alternative to the U.S. dollar for the $2.1 trillion China holds in reserve, currency traders have a heart attack.) If Americans saved more and spent less, consistently over time, they wouldn’t have to worry about all that.
57. How did the economic crisis affect Americans?
A) They had to tighten their belts.
B) Their bank savings rate dropped to zero.
C) Their leadership in the global economy was shaken.
D) They became concerned about China’s financial policy.
58. What should be done to encourage Chinese people to consume?
A) Changing their traditional way of life.
B) Providing fewer incentives for saving.
C) Improving China’s social security system.
D) Cutting down the expenses on child-rearing.
59. What does the author mean by saying “savings are the seed corn of a good economic harvest” (Line 4, Para. 4)?
A) The more one saves, the more returns one will reap.
B) A country’s economy hinges on its savings policy.
C) Those who keep saving will live an easy life in the end.
D) A healthy savings rate promotes economic prosperity.
60. In what circumstances do currency traders become scared?
A) When Beijing allows its currency exchange rates to float.
B) When China starts to reduce its current foreign reserves.
C) When China talks about switching its dollar reserves to other currencies.
D) When Beijing mentions in public the huge debts America owes China.
61. What is the author’s purpose of writing the passage?
A) To urge the American government to cut deficits.
B) To encourage Chinese people to spend more.
C) To tell Americans not to worry about their economy.
47.D) To promote understanding between China and America.【点评】
本文讲述了在全球经济危机的背景下，美国人要向中国人学习勤俭，学会储蓄。为什么这样做呢？文章中指出良好的储蓄率能够推动经济的繁荣。但即使美国家庭开始储蓄更多，如果政府常年赤字的话，对美国来说还是“反储蓄”的。所以文章的目的是敦促美国政府降低赤字，并在文末再一次强调要坚持向中国学习存多花少，
57. How did the economic crisis affect Americans?
They had to tighten their belts.
【解析】细节题。从原文第二段最后一句话“the shock of the economic crisis last year prompted people to snap shut their wallets”可见，经济危机使得美国民众关紧钱包，即少花钱，也就是答案中tighten their belts（勒紧腰带，节省开支）的意思。所以正确答案为A。
58. What should be done to encourage Chinese people to consume?
Improving China’s social security system.
【解析】细节题。从原文中的“even if the government creates a better social safety net and
successfully encourages greater consumer spending”可见，如要鼓励中国人消费更多，这需要提高社会安全系统。
59. What doe s the author mean by saying “savings are the seed corn of a good economic harvest” (Line 4, Para. 4)?
A healthy savings rate promotes economic prosperity.
【解析】细节题。根据题干提示，定位至第四段最后一句，我们发现这句话是前面几句话的概括，那根据前面“High savings lead, over time, to increased inves tment, which in turn generates productivity gains, innovation and job growth.”可知，高储蓄率能够促进投资，进而促进生产率、创新和岗位增长，即促进经济的繁荣。所以正确答案为D。
60. In what circumstances do currency traders become scared?
When Beijing mentions in public the huge debts America owes China.
【解析】细节题。从原文中的“Every time any official in Beijing deliberately publicly about seeking an alternative to the U.S. dollar for the $2.1 trillion China holds in reserve, currency traders have a heart attack.”可知，每当中国政府公开提到美国欠我国的大量债务，货币交易员们就担惊受怕。因为本段一开始提到作为最大的债权国，财政上的漏洞会造成经济的混乱。所以正确答案为D。
61. What is the author’s purpose of writing the passage?
To urge the American government to cut deficits.
【解析】主旨题。纵观全文，作者一直在强调美国应该向中国学习勤俭，文中第五段的第一句话“By running constant deficits, it is dis-saving, even as households sav e more.”也给到我们提示，既然长期运行赤字是不利于储蓄的，那美国政府应该做的是降低赤字。所以正确答案是A。
最牛英语口语培训模式：躺在家里练口语，全程外教一对一，三个月畅谈无阻！ 洛基英语，免费体验全部在线一对一课程：https://www.doczj.com/doc/9e4176258.html,/ielts/xd.html（报名网址） Unit 10 Part ⅡReading Comprehension (35 minutes) Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre Questions 21 to 25 are based on the following passage: More and more, the operations of our businesses, governments, and financial institutions are controlled by information that exists only inside computer memories. Anyone clever enough to modify this information for his own purposes can reap substantial rewards. Even worse, a number of people who have done this and been caught at it have managed to get away without punishment. It's easy for computer crimes to go undetected if no one checks up on what the computer is doing. But even if the crime is detected, the criminal may walk away not only unpunished but with a glowing recommendation from his former employers. Of course, we have no statistics on crimes that go undetected. But it's disturbing to note how many of the crimes we do know about were detected by accident, not by systematic inspections or other security procedures. The computer criminals who have been caught may be the victims of uncommonly bad luck. For example, a certain keypunch (键盘打孔) operator complained of having to stay overtime to punch extra cards. Investigation revealed that the extra cards she was being asked to punch were for dishonest transactions. In another case, dissatisfied employees of the thief tipped off (向……透露) the company that was being robbed. Unlike other lawbreakers, who must leave the country, commit suicide, or go to jail, computer criminals sometimes escape punishment, demanding not only that they not be charged but that they be given good recommendations and perhaps other benefits. All too often, their demands have been met. Why? Because company executives are afraid of the bad publicity that would result if the public found out that their computer had been misused. They hesitate at the thought of a criminal boasting in open court of how he juggled (耍弄) the most confidential records right under the noses of the company's executives, accountants,
2017 年6 月大学英语六级考试真题(第1 套) Part ⅠWriting (30 minutes) Directions: Suppose you are asked to give advice on whether to attend a vocational college or a university, write an essay to state your opinion. You are required to write at least 150 words but no more than 200 words. Part ⅡListening Comprehension (30 minutes) Section A Directions : In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1.A) He would feel insulted. B) He would feel very sad. C) He would be embarrassed. D) He would be disappointed. 2.A) They are worthy of a prize. B) They are of little value. C)They make good reading. D) They need improvement. 3.A) He seldom writes a book straight through. B)He writes several books simultaneously. C)He draws on his real-life experiences. D)He often turns to his wife for help. 4.A) Writing a book is just like watching a football match. B)Writers actually work every bit as hard as footballers. C)He likes watching a football match after finishing a book. D)Unlike a football match, there is no end to writing a book. Questions 5 to 8 are based on the conversation you have just heard. 5.A) A chievements of black male athletes in college. B)Financial assistance to black athletes in college. C)High college dropout rates among black athletes. D)Undergraduate enrollments of black athletes. 6.A) They display great talent in every kind of game. B)They are better at sports than at academic work. C)They have difficulty finding money to complete their studies. D)They make money for the college but often fail to earn a degree. 7.A) About 15%. B) Around 40%. C)Slightly over 50%. D) Approximately 70%. 8.A) Coaches lack the incentive to graduate them. B)College degrees do not count much to them. C)They have little interest in academic work. D)Schools do not deem it a serious problem. Section B
2017年6月大学英语六级考试真题及答案解析（第一套） Part I Writing (30 minutes) Directions: Suppose you are asked to give advice on whether to attend a vocational college or a university, write an essay to state your opinion. You are required to write at least 150 words but no more than 200 words. 【参考范文】 Whether to Attend a Vocational College or a University? It’s an undisputable truth that virtually all high school graduates will encounter the choices between a vocational college and a university. And when it comes to this question, students’ ideas are not cut from the same cloth. In point of which to choose and what to be taken into consideration, my advices are as follow. In the first place, we should be conscious of the fact that both of the two choices have its own superiorities. For instance, a vocational college specializes in cultivating human resources with practical capabilities; while a university serves as the cradle of academic researchers in different fields. Then it does follow that high school graduates should have a clear picture of themselves. That is to say, they should know their merits and demerits and their choices must give play to their strengths whilst circumvent weaknesses. In addition, interest is the best teacher and it’s also the premise of learning on one’s own initiative. Thus interest must be taken into account because it can not only decide how far one can reach academically and professionally but also how happy and fulfilled one will be. In brief, all above just goes to show that there really is no one-size-fits-all answer for the question. The key lies in a clear cognition, accurate self-positioning and the interest of oneself. Only then can every one find a right path that works best for us. Part II Listening Comprehension (30 minutes) Section A Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1. A) He would feel insulted. B) He would feel very sad. C) He would be embarrassed. D) He would be disappointed. 【答案】A 【解析】题目问如果男士在二手书店中发现了自己写的书，那么男士会感觉怎样。男士说到：如果他在二手书店发现了自己的书，他会认为这是种侮辱。因此选A。 2. A) They are worthy of a prize. B) They are of little value. C) They make good reading. D) They need improvement. 【答案】B 【解析】题目问男士的妻子认为他的书怎么样。男士说到：他最新的一本书是在2004年写的，当时在写的时候给他妻子看了一小部分。妻子认为他写的内容是垃圾。这表明他的妻子认为他写的书毫无价值。因此选B。 3. A) He seldom writes a book straight through. B) He writes several books simultaneously. C) He draws on his real-life experiences. D) He often turns to his wife for help. 【答案】A
20XX年6月大英语六级考试真题及答案解析 Part I Writing (30 minutes) Directions: For this part, you are allowed 30 minutes to write a short essay on living in the virtual world. Try to imagine what will happen when people spend more and more time in the virtual world instead of interacting in the real world. You are required to write at least 150 words but no more than 200 words. Part II Listening Comprehension (30 minutes) Section A Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A),B),C)and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1. A)Project organizer B)Public relations officer. C)Marketing manager. D)Market research consultant. 2.A)Quantitative advertising research. B)Questionnaire design. C)Research methodology. D)Interviewer training. 3.A)They are intensive studies of people’s spending habits. B)They examine relations between producers and customers. C)They look for new and effective ways to promote products. D)They study trends or customer satisfaction over a long period. 4.A)The lack of promotion opportunity. B)Checking charts and tables. C)Designing questionnaires. D)The persistent intensity. Questions 5 to 8 are based on the conversation you have just heard. 5.A)His view on Canadian universities. B)His understanding of higher education. C)His suggestions for improvements in higher education. D)His complaint about bureaucracy in American universities. 6.A)It is well designed. B)It is rather inflexible.
2007年12月大学英语六级考试真题 Passage One Questions 52 to 56 are based on the following passage. Like most people, I’ve long understood that I will be judged by my occupation, that my profession is a gauge people use to see how smart or talented I am. Recently, however, I was disappointed to see that it also decides how I’m treated as a person. Last year I left a professional position as a small-town reporter and took a job waiting tables. As someone paid to serve food to people. I had customers say and do things to me I suspect they’d never say or do to their most casual acquaintances. One night a man talking on his cell phone waved me away, then beckoned (示意) me back with his finger minute later, complaining he was ready to order and asking where I’d been. I had waited tables during summers in college and was treated like a peon (勤杂工) plenty of people. But at 19 years old, I believed I deserved inferior treatment from professional adults. Besides, people responded to me differently after I told them I was in college. Customers would joke that one day I’d be sitting at their table, waiting to be served. Once I graduated I took a job at a community newspaper. From my first day, I heard a respectful tone from everyone who called me. I assumed this was the way the professional world worked — cordially. I soon found out differently. I sat several feet away from an advertising sales representative with a similar name. Our calls would often get mixed up and someone asking for Kristen would be transferred to Christie. The mistake was immediately evident. Perhaps it was because money was involved, but people used a tone with Kristen that they never used with me. My job title made people treat me with courtesy. So it was a shock to return to the restaurant industry. It’s no secret that there’s a lot to put up with when waiting tables, and fortunately, much of it can be easily forgotten when you pocket the tips. The service industry, by definition, exists to cater to others’ needs. Still, it seemed that many of my customers didn’t g et the difference between server and servant. I’m now applying to graduated school, which means someday I’ll return to a profession where people need to be nice to me in order to get what they want, I think I’ll take them to dinner first, and see how they treat someone whose only job is to serve them. 52. The author was disappointed to find that _______. [A] one’s position is used as a gauge to measure one’s intelligence [B] talented people like her should fail to get a respectable job [C] one’s occupation affects the way one is treated as a person [D] professionals tend to look down upon manual workers 53. What does the author intend to say by the example in the second paragraph? [A] Some customers simply show no respect to those who serve them. [B] People absorbed in a phone conversation tend to be absent-minded. [C] Waitresses are often treated by customers as casual acquaintances. [D] Some customers like to make loud complaints for no reason at all. 54. How did the author feel when waiting tables at the age of 19? [A] She felt it unfair to be treated as a mere servant by professional. [B] She felt badly hurt when her customers regarded her as a peon. [C] She was embarrassed each time her customers joked with her. [D] She found it natural for professionals to treat her as inferior. 55. What does the author imply by saying “…many of my customers didn’t get the difference between server and servant”(Lines 3-4, Para.7)? [A] Those who cater to others’ needs are destined to be looked down upon.
2018年12月大学生英语六级考试真题卷一（听力部分）PartⅡ Listening Comprehension (30 minutes) Section A Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A），B），C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1. A) It can benefit professionals and non-professionals alike. B) It lists the various challenges physicists are confronting. C) It describes how some mysteries of physics were solved. D) It is one of the most fascinating physics books ever written. 2. A) Physicists’ contribution to humanity. B) Stories about some female physicists. C) Historical evolution of modern physics. D) Women’s changing attitudes to physics. 3. A)By exposing a lot of myths in physics. B) By describing her own life experiences. C) By including lots of fascinating knowledge. D) By telling anecdotes about famous professors. 4. A) It avoids detailing abstract concepts of physics. B) It contains a lot of thought-provoking questions. C) It demonstrates how they can become physicists. D)It provides experiments they can do themselves. Questions 5 to 8 are based on the conversation you have just heard. 5. A) He is too busy to finish his assignment in time. B) He does not know what kid of topic to write on. C) He does not understand the professor’s instructions. D) He has no idea how to proceed with his dissertation. 6. A) It is too broad. B) It is outdated. C) It is challenging. D) It is interesting. 7. A) Biography. B) Nature. C) Photography. D) Beauty. 8. A) Improve his cumulative grade. B) Develop his reading ability. C) Stick to the topic assigned.
2016年6月大英语六级考试真题及答案解析 Part I Writing (30 minutes) Directions: For this part, you are allowed 30 minutes to write a short essay on living in the virtual world. Try to imagine what will happen when people spend more and more time in the virtual world instead of interacting in the real world. You are required to write at least 150 words but no more than 200 words. Part II Listening Comprehension (30 minutes) Section A Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A),B),C)and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1. A)Project organizer B)Public relations officer. C)Marketing manager. D)Market research consultant. 2.A)Quantitative advertising research. B)Questionnaire design. C)Research methodology. D)Interviewer training. 3.A)They are intensive studies of people’s spending habits. B)They examine relations between producers and customers. C)They look for new and effective ways to promote products. D)They study trends or customer satisfaction over a long period. 4.A)The lack of promotion opportunity. B)Checking charts and tables. C)Designing questionnaires. D)The persistent intensity. Questions 5 to 8 are based on the conversation you have just heard. 5.A)His view on Canadian universities. B)His understanding of higher education. C)His suggestions for improvements in higher education. D)His complaint about bureaucracy in American universities. 6.A)It is well designed. B)It is rather inflexible.
2011年6月大学英语六级真题及答案 Part IV Reading Comprehension (Reading in Depth) (25 minutes) Section A Directions: In this section, there is a short passage with 5 questions or incomplete statements. Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words. Please write your answers on Answer Sheet 2. Questions 47 to 51 are based on the following passage. How good are you at saying "no"? For many, it's surprisingly difficult. This is especially true of editors, who by nature tend to be eager and engaged participants in everything they do. Consider these scenarios: It's late in the day. That front-page package you've been working on is nearly complete; one last edit and it's finished. Enter the executive editor, who makes a suggestion requiring a more-than-modest rearrangement of the design and the addition of an information box. You want to scream: "No! It's done!" What do you do? The first rule of saying no to the boss is don't say no. She probably has something in mind when she makes suggestions, and it's up to you to find out what. The second rule is don't raise the stakes by challenging her authority. That issue is already decided. The third rule is to be ready to cite options and consequences. The boss's suggestions might be appropriate, but there are always consequences. She might not know about the pages backing up that need attention, or about the designer who had to go home sick. Tell her she can have what she wants, but explain the consequences. Understand what she's trying to accomplish and propose a Plan B that will make it happen without destroying what you've done so far. Here's another case. Your least-favorite reporter suggests a dumb story idea. This one should be easy, but it's not. If you say no, even politely, you risk inhibiting further ideas, not just from that reporter, but from others who heard that you turned down the idea. This scenario is common in newsrooms that lack a systematic way to filter story suggestions. Two steps are necessary. First, you need a system for how stories are proposed and reviewed. Reporters can tolerate rejection of their ideas if they believe they were given a fair hearing. Your gut reaction (本能反应) and dismissive rejection, even of a worthless idea, might not qualify as systematic or fair. Second, the people you work with need to negotiate a "What if ...?" agreement covering "What if my idea is turned down?" How are people expected to react? Is there an appeal process? Can they refine the idea and resubmit it? By anticipating "What if...?" situations before they happen, you can reach understanding that will help ease you out of confrontations. 47. Instead of directly saying no to your boss, you should find out __________. 48. The author's second warning is that we should avoid running a greater risk by __________. 49. One way of responding to your boss's suggestion is to explain the __________ to her and offer an alternative solution. 50. To ensure fairness to reporters, it is important to set up a system for stories to __________. 51. People who learn to anticipate "What if...?" situations will be able to reach understanding and avoid __________. Section B Directions:There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre. Passage One Questions 52 to 56 are based on the following passage. At the heart of the debate over illegal immigration lies one key question: are immigrants good or bad for the economy? The American public overwhelmingly thinks they're bad. Yet the consensus among most economists is