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look a lot alike—either doppelgangers (长相极相似的人）可知：机器也很难辨别那些看起
来很相似的人。题目的问题为：面部识别机的缺点是什么？四个选项分别为：(A)他们很难把外表相近的人区分开来.(B)他们难以识别面部表情的变化。C)他们对人们情绪的微小变化不敏感。(D)他们在区分同年龄的人方面有困难。A选项符合原文，因此，本题的正确选项为A项。
50.What is the difficulty confronting researchers of facial-recognition machines? A) No computer is yet able to handle huge datasets of human faces. B) There do not exist public databases with sufficient face samples. C) There are no appropriate algorithms to process the face samples. D) They have trouble converting face datasets into the right format. 【答案】B
【解析】 本题为细节题，由 【50】The trouble is, for many of the researchers who’d like to design systems to address these challenges, massive datasets for experimentation just don’t exist—at least, not in formats that are accessible to academic researchers. Training sets like the ones Google and Facebook have are private. There are no public databases that contain millions of faces. MegaFace's creators say it’s the largest publicly available facial-recognition dataset out there. \in a dataset,\可知：问题在于，对于许多想要设计系统来应对这些挑战
的研究人员来说，大规模的实验数据集根本不存在-至少不存在学术研究人员可以使用的格式。像谷歌和Facebook这样的数据库是私人的。没有包含数百万张面孔的公共数据库。MegaFace的创建者说，这是目前最大的可公开使用的面部识别数据集。研究人员写道：“一个最终的人脸识别算法应该会在一个数据集中的数十亿人像的数据库上执行。”题目的问题为：面部识别机器的研究人员面临的困难是什么？四个选项分别为：(A)目前还没有一台计算机能够处理巨大的人脸数据集。(B)没有足够面部样本的公共数据库。C)没有合适的算法来处理人脸样本。(D)他们难以将脸数据集转换成正确的格式。B选项更符合原文中数据库资源短缺的问题，因此，本题的正确选项为B项。
Passage Two
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Questions 51 to 55 are based on the following passage.
There’re currently 21.5 million students in America，and many will be funding their college on borrowed money. 【51】Given that there's now over $1.3 trillion in student loans on the books, it's pretty clear that many students are far from sensible. The average student’s
debt upon graduation now approaches $40,000,and as college becomes ever more expensive, calls to make it \，\a barrier. \
【52】But the only way college could be free is if the faculty and staff donated their time, the buildings required no maintenance, and campuses required no utilities. As long as it’s impossible to produce something from nothing, costs are absolutely a barrier. The actual question we debate is who should pay for people to go to college. If taxpayers are to bear the cost of forgiving student loans, shouldn't they have a say in how their money is used?
【53】At least taxpayers should be able to decide what students will study on the public dime. If we're going to force taxpayers to foot the bill for college degrees, students should only study those subjects that're of greatest benefit to taxpayers. After all, students making their own choices in this respect is what caused the problem in the first place. We simply don't need more poetry, gender studies, or sociology majors. How do we know which subjects benefit society? Easy.
【54】Average starting salaries give a clear indication of what type of training society needs its new workers to have. Certainly, there’re benefits to a college major beyond the job a student can perform. But if we're talking about the benefits to society, the only thing that matters is what the major enables the student to produce for society. And the value of what the student can produce is reflected in the wage
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employers are willing to pay the student to produce it. A low wage for elementary school teachers, however, doesn’t mean elementary education isn't important. It simply means there're too many elementary school teachers already.
Meanwhile there’re few who're willing and able to perform jobs requiring a petroleum engineering major, so the value of one more of those people is very high.
【55】So we can have taxpayers pick up students' tuition in exchange for dictating what those students will study. Or we can allow students both to choose their majors and pay for their education themselves. But in the end, one of two things is true： Either a college major is worth its cost or it isn’t. If yes,taxpayer financing isn’t needed. If not,taxpayer financing isn't desirable. Either way, taxpayers have no business paying for students’ college education. 注意：此部分试题请在答题卡2上作答。 【杀掉拦路虎】
1. multiply [?m?ltiplai]
vt.& vi. 乘;（使）相乘;（使）增加;（使）繁殖;
adv. 多样地;复合地;多倍地;[电学]并联地，多路地;
adj. 多层的;多样的;多股的
2. maintenance [?meintin?ns] n. 维持，保持;保养，保管;维护;维修
3. utilities [ju:'t?l?t?z]
n.[经济学]效用（ utility的名词复数 ）；实用；公用事业；神庙逃亡游戏中的一次性道具
2018年6月大学英语六级真题试卷及答案（二）
4. elementary [?el??mentri]
adj.基本的；初级的；[化]元素的；初等
5. petroleum [pi?tr?uli?m] n. 石油
6. tuition [tju?i??n] n. 学费;教学，讲授
7. dictating ['d?k?te?t??]
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v.大声讲或读( dictate的现在分词 )；口授；支配；摆布
8. irrational [??r???nl]
adj.不合理的，荒谬的；无理性的；[数]无理的
n.无理数；无理性的生物
9. impractical [?m?pr?kt?kl]
adj.不切实际的；无用的；不现实的；不善做实际工作的
10. unsustainable [??ns??ste?n?bl] adj.不能证实的，不能成立的，不能支持的
11. underestimate [??nd?r?estimeit] vt. 低估;对…估计不足;看轻;把…的价值估计过低;
n. 低估;估计不足;过低评价，过低估价;轻视
12. embody [im?b?di]
vt. 表现，象征;包含，收录;使具体化;[军]组编
51.What does the author think of college students funding their education through loans? A) They only expect to get huge returns. B) They are acting in an irrational way. C) They benefit at taxpayers' expense. D) They will regret doing so someday. 【答案】B
【解析】 本题为细节题，由【 51】Given that there's now over $1.3 trillion in student loans on the books, it's pretty clear that many students are far from sensible. 可知：考虑到现
在账面上有超过1.3万亿美元的学生贷款，很明显，许多学生都是不合乎情理的。题目的问题为：笔者对大学生贷款资助教育有何看法？四个选项分别为：(A)他们只期望获得巨大的回报。(B)他们的行为是不合理的。(C)他们受益于纳税人的费用。他们总有一天会后悔的。由此可见B选项符合原文，因此，本题的正确选项为B项。
52.In the author's opinion, free college education is_______. A) impractical C) a goal to strive for B) unsustainable D) a way to social equality
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【答案】A
【解析】 本题为细节题，由【52】But the only way college could be free is if the faculty and staff donated their time, the buildings required no maintenance, and campuses required no utilities. As long as it’s impossible to produce something from nothing, costs are absolutely a barrier.可知：但是大学可以免费的唯一途径是教师和工作人员捐出时
间，建筑物不需要维护，校园不需要公共设施。既然，没有任何投入，就想要得到回报是不可能的，费用绝对是一个问题。题目的问题为：作者认为，免费大学教育是___。四个选项分别为：A）不切实际的C）追求的目标B）不可持续的D）一条通向社会不平等的路。A选项符合原文中“没有任何投入，就想要得到回报是不可能的”这条准则，因此，本题的正确选项为A项。
53.What should students do if taxpayers are to bear their college costs? A) Work even harder to repay society. B) Choose their subjects more carefully.
C) Choose majors that will serve society's practical needs. D) Allow taxpayers to participate in college administration. 【答案】C
【解析】 本题为细节题，由【 53】At least taxpayers should be able to decide what students will study on the public dime. If we're going to force taxpayers to foot the bill for college degrees, students should only study those subjects that're of greatest benefit to taxpayers. After all, students making their own choices in this respect is what caused the problem in the first place. We simply don't need more poetry, gender studies, or sociology majors. 可知：至少纳税人应该能够决定学生将学习什么。如果我们要强迫纳税人为
大学学位买单，学生们只应该学习那些对纳税人最有益的科目。毕竟，学生在这方面作出自己的选择，才是问题的根源。我们根本不需要更多的诗歌、性别研究或社会学专业。题目的问题为：如果纳税人要承担他们的大学费用，学生该做些什么？四个选项分别为：(A)更加努力地工作以报答社会。(B)更仔细地选择他们的专业。C)选择符合社会实际需要的专业。D)允许纳税人参与大学管理。由原文可知：如果我们要强迫纳税人为大学学位买单，学生们只应该学习那些对纳税人最有益的科
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