2. Much more rides on the Olympic Games in Tokyo this summer, Mr. Abe intends them to foster the patriotism ______ absence among ordinary Japanesehe laments.
3. Chinese cinemas will be allowed to reopen starting July 20 in low risk areas, after months of closure ______ the coronavirus outbreak.
A.in spite of
B.for the sake of
C.in case of
D.because of
A B C D
D
[考点] 考查介词短语辨析。 [解析] 句意:自7月20日起,由于冠状病毒爆发而关闭了数月的电影院将获准在中国低风险区域重新开放。in spite of“尽管,不管”;for the sake of“为了”;in case of“万一,如果”;because of“因为,由于”。根据语境,介词短语作后置定语修饰closure,因此because of最为符合,故本题选D。
4. The government reckons that more than 150 million people in China, or at least one in three, have diabetes, the ______ of this disease among Chinese is alarming.
7. This particular ______ of coast is especially popular with walkers.
A.stretch
B.patch
C.extension
D.stride
A B C D
A
[考点] 考查名词辨析和固定搭配。 [解析] 句意:这片特殊的海岸非常受步行者的欢迎。stretch“(陆地或水域)连绵的一片”,stretch of sth.为固定搭配,意为“一片(段)……”,如a stretch of road“一段路”;patch“碎片;小块土地”;extension“拓展;延伸”;stride“大步;步幅;进展”。根据句意,此处应指“一片海岸”,故本题选A。
8. Although his mental illness had ______ his war service, it had not been caused by it.
A.coincided with
B.taken up
C.made up of
D.conformed to
A B C D
A
[考点] 考查动词短语辨析。 [解析] 句意:虽然他的精神疾病是在战时服役期间患的,但并不是由战争引起的。coincide with“与……一致,与……同时发生”;take up“开始从事;占据(时间、地方)”;make up of“构成,由……组成”;conform to“符合;遵照”。根据句意,此处应指精神疾病与服兵役是“同时发生”的,故本题选A。
9. Ryu is one of almost 1 billion students around the world ______ schooling has been interrupted as a result of Covid-19.
A.whose
B.for whom
C.for which
D.in that
A B C D
A
[考点] 考查定语从句。 [解析] 句意:全世界有近10亿名学生因新冠肺炎疫情而停课,Ryu是其中之一。分析句子结构,schooling has been interrupted as a result of Covid-19是定语从句,先行词是Ryu。根据句意,空格处表示“……的”,在句中作定语,修饰名词schooling。四个选项中,whose引导定语从句,在句中作定语,表示“……的”,符合语境;for whom和for which可以引导定语从句,均为“介词+关系代词”的形式,不符合语境,故排除;in that常用于引导原因状语从句,排除。故本题选A。
10. Beyond those lucky enough to be able to work from home, many people still have to ______ in person and/or juggle child care when daycare programs and schools are shuttered.
12. Anti-nuclear activists have long called for the bomb ______ before the last survivor of the Japanese atomic bombing passes away.
A.to abolish
B.being abolished
C.abolished
D.to be abolished
A B C D
D
[考点] 考查非谓语动词。 [解析] 句意:反核活动人士长期以来一直呼吁,在日本原子弹爆炸的最后一名幸存者过世之前废除原子弹。call for...to do sth.表示“要求/呼吁……做某事”,所以排除B、C。bomb和abolish之间是被动关系,所以应该用动词不定式的被动语态,故本题选D。
13. According to economist Andrew Hunter, the drop in GDP shows the unprecedented ______ to the economy from the pandemic, and it will take years for the economy to recover.
二、阅读理解 UC Berkeley professors have previously used YouTube videos as a guide for robots to learn various motions such as jumping or dancing, while Google has trained robots to understand depth and motion. In a collaboration between Google Brain, Inter-Corporation and the University of California, Berkeley, researchers applied that knowledge to their latest project, Motion2Vec, in which videos of actual surgical procedures are used for instruction. In a recently released research paper, researchers outline how they used YouTube videos to train a two-armed da Vinci robot to insert needles and perform sutures on a cloth device. The medical team relied on Siamese networks, a deep-learning setup that incorporates two or more networks sharing the same data. The system is optimal for comparing and assessing relationships between datasets. Such networks have been used in the past for facial detection. Ken Goldberg, a physician who heads the UC Berkeley laboratory, explains YouTube is a rich source of instructional materials for it. "YouTube gets 500 hours of new material every minute. It's an incredible repository," he said. "Any human can watch almost any one of those videos and make sense of it; a robot currently just see it as a stream of pixels. So the goal of this work is to try. and make sense of those pixels. That is to look at the video, analyze it, and be able to segment the videos into meaningful sequences." For the suture task, the team needed only 78 instructional medical videos to train its AI engine to perform the procedure. They claim a success rate of 85 percent. This means that robots can eventually undertake some of the more basic, repetitive tasks in surgical procedures and allow surgeons to focus their time and energy on the more exacting steps. "We didn't consider too far, "Goldberg said. "What we're moving towards is the ability for a surgeon, who would be watching the system, to indicate where they want a row of sutures, convey that they want six overhand sutures," Goldberg said. "then the robot would essentially start doing that and the surgeon would...be able to relax a little bit so that they could then be more rested and able to focus on more complex or nuanced parts of the surgery." Machine learning has contributed much to biotechnology in recent years. The ability of AI to rapidly process huge volumes of data has yielded progress in detecting lung cancer and stroke risk based on CAT scans, calculating risk of heart disease and cardiac arrest based on EKG and MRI imagery, classifying skin lesions from photos and detecting signs of diabetic distress in eye images. And here in the middle of a pandemic, AI is helping scientists find drugs that may curb the spread of COVID-19 and eventually find a cure and a vaccine.
1. How does Google train the robots? ______
A.Through the use of instructional videos.
B.By using a deep-learning setup.
C.By programming code.
D.By implanting chip in them.
A B C D
A
[解析] 细节题。题干:谷歌如何训练机器人? 根据题干关键词Google train the robots定位至文章第一段“UC Berkeley professors have previously used YouTube videos as a guide for robots to learn various motions such as jumping or dancing...(加州大学伯克利分校的教授们此前曾用YouTube视频作为机器人学习跳跃或跳舞等各种动作的指南……)”及第二段第一句“In a collaboration between Google Brain, Inter-Corporation and the University of California, Berkeley, researchers applied that knowledge to their latest project, Motion2Vec, in which videos of actual surgical procedures are used for instruction(在Google Brain、Inter-Corporation和加州大学伯克利分校的合作中,研究人员将这些知识应用到他们最新的项目Motion2Vec中,在这个项目中,用实际手术过程的视频进行指导)”,由此可知,谷歌训练机器人的方式是通过视频指导及教学录像,并将其用于其他项目中。A项“通过教学录像”的表述与文章内容一致,故A项正确。 B项“通过深度学习设置”、C项“通过编程代码”及D项“通过植入芯片”均不属于谷歌训练机器人的方式。 故本题选A。
2. What does "it" (paragraph 3) refer to according to the passage? ______
3. Which of the following is true according to the passage? ______
A.Robots ultimately play a more auxiliary role in surgery.
B.78 medical videos are used to train robots to perform complicated surgical procedures.
C.Robots can make sense of pixels and get instructions from them.
D.Segmenting the videos into meaningful pixels is conducive to robots learning.
A B C D
A
[解析] 细节题。题干:根据文章,下列哪个选项是正确的?本题题干中无明显关键词,需根据选项逐一回原文中进行定位解题。 A项“机器人最终在外科手术中扮演更辅助的角色”,根据文章第五段最后一句“This means that robots can eventually undertake some of the more basic, repetitive tasks in surgical procedures and allow surgeons to focus their time and energy on the more exacting steps(这意味着机器人最终可以在手术过程中承担一些更基本、重复性的任务,让外科医生把他们的时间和精力集中在更精确的步骤上)”可知,机器人最终可以在手术中承担一些基本且具有重复性的任务,故可推断m机器人最终在外科手术中扮演的是更为辅助的角色。因此A项是文章内容的同义转述,正确。 B项“78个医疗视频被用来训练机器人执行复杂的外科手术”,根据选项关键词78 medical videos可定位至文章第五段第一句“For the suture task, the team needed only 78 instructional medical videos to train its AI engine to perform the procedure(对于缝合任务,该团队只需要78个教学医疗视频来训练其人工智能引擎执行该过程)”。根据文章内容可知,医疗视频被用来训练机器人进行简单的缝合任务,并不能推断出医疗视频被用来训练机器人执行复杂的外科手术,故B项错误,排除。 C项“机器人可以理解像素并从它们那里得到指令”,根据第四段第二、三句“...a robot currently just see it as a stream of pixels. So the goal of this work is to try and make sense of those pixels(……目前机器人只是把它看作一串像素,所以这项工作的目标就是尝试理解这些像素)”可知,文章中并未提及机器人会从像素那里得到指令。故C项属于无中生有,排除。 D项“将视频分割成有意义的像素,有利于机器人学习”,文章并未提及,故排除。 综上所述,本题选A。
4. The italic paragraph can be better used to answer which of the following questions? ______
A.How can robots help doctors perform surgery?
B.What is the gap between robots and surgeons?
C.What surgical skills do we need to further train these robots?
D.Will robots replace surgeons soon?
A B C D
D
[解析] 推断题。题干:斜体段落更适合回答下列哪个问题? 根据题干关键词italic paragraph定位到倒数第三段。该段主要内容:“我们没有考虑太远。”戈德堡说,“我们正在努力实现的是,外科医生能够观察系统,指示他们想要一排缝线的位置,并传达他们想要六排缝线的信息。”然后机器人就会开始做手术,外科医生就会……能够稍微放松一点,这样他们就能得到更多的休息,并能够专注于更复杂或更微妙的手术部分。据此可推断出,该段主要讨论的是机器人能否取代外科医生。同时根据该段第一句“we didn't consider too far(我们没考虑太远)”也可判断,D项“机器人会很快取代外科医生吗?”为正确答案。 A项“机器人如何帮助医生进行手术”,B项“机器人和外科医生之间的差距是什么”,C项“我们需要什么外科手术技能来进一步训练这些机器人”均不符合文意,故排除。 综上所述,本题选D。
5. AI has been successfully used for the following functions except ______.
A.disclosing lung cancer and stroke risk
B.detecting signs of diabetic distress
C.finding a cure and a vaccine for a pandemic
D.estimating the probability of cardiac arrest
A B C D
C
[解析] 细节题。题干:人工智能已经成功用于以下活动中,除了______。 通读全文可知,文章最后两段集中阐述人工智能目前所取得的成果,故可定位至文章最后两段。根据倒数第二段的第二句“The ability of AI to rapidl3r process huge volumes of data has yielded progress in detecting lung cancer and stroke risk based on CAT scans, calculating risk of heart disease and cardiac arrest based on EKG and MRI imagery, classifying skin lesions from photos and detecting signs of diabetic distress in eye images(人工智能快速处理大量数据的能力在基于CAT扫描检测肺癌和中风风险、基于EKG和MRI图像计算心脏病和心脏骤停风险、根据照片对皮肤病变进行分类,以及在眼睛图像中检测糖尿病的迹象等方面取得了进展)”可知,A项“检测肺癌和中风风险”,B项“检测糖尿病症状”和D项“估计心脏骤停的可能性”文中均有提及。 根据最后一段“And here in the middle of a pandemic, AI is helping scientists find drugs that may curb the spread of COVID-19 and eventually find a cure and a vaccine(在疫情大流行之际,人工智能正在帮助科学家们找到可能遏制新冠病毒传播的药物,并最终找到治疗方法和疫苗)”可知,人工智能正在寻找治疗方法和疫苗,目前还未找到,所以,C项“找到治疗流行病的方法和疫苗”不符合文意。 综上所述,本题选C。
If you've ever taken a personality test, you may have been eager to review the results. Maybe you're a Helper or Achiever on the Enneagram chart. Or perhaps, like me, you're an INTP on Myers-Briggs. While these tests can be fun to take—who doesn't love to learn about themselves? —they could also hold you back, says psychologist Hardy. "We like to develop theories to explain things, but people are not easy to categorize; we're not like fruit and vegetables." Tests can also feel comforting as they can give you a sense of identity. "Your personality is how you consistently act and behave," says Hardy. "Personality tests promote the misconception that personality is innate and unchanging," he says. "They look at your past to predict your future, and that can be sad for someone who wants to grow or change." Ask yourself if you're the same person you were 10 years ago. Hardy argues that most of us would say "No." "You probably don't hate who you were in the past. But you've probably gone through a lot, and you see things differently. You may have different habits, patterns, choices, and priorities." he says. It's healthy to view your former person as a different self. "When you view your future self as a different person, you can make intentional decisions for that person in the present." says Hardy. If you hold onto a label that a personality test provides, you may seek to cling to and defend it, says Hardy. "You're not as flexible if you seek to confirm your label," he says. "This leads you to believe your future self will be exactly the same as you are today, which is an impediment to growth." Thus, different views on personality tests are more recommended. "If something negative, like a trauma, happened to you, it's easy to be defined by that former experience," says Hardy. A negative experience can shape identity, and you need to reframe those meanings from the past. "It's best to view the past as positive," says Hardy. "Even something negative could be viewed as the best thing that could have happened to you if you frame it correctly." It can help to talk about negative experiences. "You can gain a clear picture of the event and start to see it differently," says Hardy. "You can choose better meanings for the past and reconstruct the memory based on who you are in the present." "You can't make intentional decisions in the present without context of the future," says Hardy. "One reason people fail to clarify their future is because they spend way more time remembering their past. Imagination is more important than knowledge." Preferences in the present that aren't in the best interest of your future self can be a detriment. "Don't hold onto your current identity," says Hardy. "A growth mindset is saying, 'This is who I am. This is who I want to be.' And that takes courage."
6. What does the second paragraph talk about? ______
A.What a personality test is.
B.Why people like personality tests.
C.People's personality is more complicated than the test result.
D.Personality tests promote the misconception of one's personality.
A B C D
B
[解析] 推断题。题干:第二段在谈论什么? 此题无法仅凭题干和选项得出答案,需理解段意并推断作者的写作意图。 第二段第一句引用了哈迪的话“we like to develop theories to explain things, but people are not easy to categorize; we're not like fruit and vegetables(我们喜欢通过发展理论去解释事物,但人类并不像水果和蔬菜那样容易归类)”,而人格测试是系统的人格分类工具,为人们认识自我提供了理论支撑。因此下句解释了人们喜欢做人格测试的原因“Tests can also feel comforting as they can give you a sense of identity(测试也能使人感到安慰,因为测试能给你一种认同感)”。故B项“为什么人们喜欢做人格测试”符合题意。 A项“什么是人格测试”,第二段没有给出人格测试的定义;C项“人的人格比测试结果更复杂”、D项“人格测试会助长对人格的误解”在第二段中没有提及,故排除A、C、D。 综上所述,本题选B。
7. What does the underlined words "different views" mean in the passage? ______
A.Personalities are defined.
B.A fixed perspective.
C.Personalities are always changing.
D.A growth mindset.
A B C D
D
[解析] 含义题。题干:文中画线的词“different views”是什么意思? 此类题目需根据画线词上下文来猜测其含义。 根据different views所在句的上句“This leads you to believe your future self will be exactly the same as you are today, which is an impediment to growth(这会让你相信未来的自己会和今天的你一模一样,这是成长的一个障碍)”可知,如果总是坚持当下的人格测试所给予的标签,这种定式思维会阻碍未来的发展。由different views所在句“Thus, different views on personality tests are more recommended(因此,更推荐用不同的观点看待性格测试)”可推测出,比起对测试结果的定式认知,文章更强调用动态、发展的心态看待人格测试,因此D项“一个成长的思维模式”为正确答案。 A项“人格被定义”,文中没有提及;B项“固定的观点”,与原文不符;C项“人格总是在变化”过于绝对,故排除A、B、C。 综上所述,本题选D。
8. What does the underlined word "detriment" mean in the passage? ______
A.Damage.
B.Default.
C.Concession.
D.Release.
A B C D
A
[解析] 含义题。题干:文中画线的单词“detriment”是什么意思? 根据画线词定位至文章最后一段。该段提到“Preferences in the present that aren't in the best interest of your future self can be a detriment. 'Don't hold onto your current identity,' says Hardy(现在的喜好如果与未来自己的最佳利益不相符,就会成为一种伤害。‘不要拘泥于你现在的身份,’哈迪说。)”再结合前文内容可知,文章一直在强调不要被人格测试的结果束缚,否则它将会成为人们成长的阻碍。由此可知,detriment指的是对未来成长不利。damage“损害,伤害”,default“违约”,concession“让步,特许(权)”,release“释放,发布,发行”。四个选项中,只有damage与detriment的意思相近。 综上所述,本题选A。
9. Which of the following advice is not mentioned in the passage? ______
A.Sharing miserable past experiences with others.
B.Reframing your view of the past.
C.Imagining the person you want to be in the future.
D.Actively developing new habits, patterns and properties.
A B C D
D
[解析] 细节题。题干:文章没有提及以下哪项建议? 题干没有明显关键词,需要结合选项关键词回原文定位,并结合排除法选出正确答案。 A项,根据关键词miserable past experiences定位至文章倒数第三段。该段首句提到谈论不好的经历会有所帮助。人们可以对事件有一个清晰的认识,并开始以不同的方式看待。由此可知A项“与他人分享痛苦的过去”是该段首句的同义表述,是建议,故排除A。 B项,根据关键词Reffaming定位至文章倒数第四段第二、三句“A negative experience can shape identity, and you need to reframe those meanings from the past. 'It's best to view the past as positive,'...(一次不好的经历会对你的性格造成影响,你需要从过去重新定义这些意义。‘最好是积极地看待过去,’……)”,由此可知,B项“重塑你对过去的看法”是建议,故排除。 C项,根据关键词Imagining定位至文章倒数第二段。该段讲到,如果不考虑未来的发展,人们就无法在当下做出有目的性的决策。人们无法理清未来的一个原因是他们花了更多的时间去回忆过去。想象力比知识更重要。由此可知,该段强调人们不能停留在过去,需要展望未来,并由此进行决策。故C项“想象你未来想成为的人”是建议,故排除。 D项,根据关键词habits,patterns and properties定位到文章第四段最后两句“But you've probably gone through a lot, and you see things differently. You may have different habits, patterns, choices, and priorities(但你可能已经经历了很多,你看待事物的方式也有所不同。你可能有不同的习惯、模式、选择和优先考虑的事情)”,由此可知,D项不是建议,是作者个人观点的阐述。 综上所述,本题选D。
10. Which of the following can be the best title of the passage? ______
A.The Result of Personality Tests Might Be Controversial
B.Why Personality Tests Could Hold You Back
C.Several Suggestions to Personality Tests
D.Personality Tests Could Derail Your Future Goals
Bilingual(双语的) education in schools has long been a political hot potato—it was banned in California by a 1998 ballot measure, which the state Senate is now asking voters to repeal. But politics aside, there's an increasing amount of scientific support for the benefits of knowing at least two languages. Now, a new study published by the Annals of Neurology finds that you don't even need to learn that second (or third, or fourth) tongue at a very young age: Picking up a new language even a little later in life can have serious cognitive(认知的) benefits for the aging brain. Many recent studies have pointed out that bilingualism seems to be good exercise for the brain and later in life might even help delay the onset of dementia. But what if it's a self-selecting crowd? What if the people who learned two languages are just smarter to begin with? To help rule that factor out, researchers at the University of Edinburgh in Scotland studied 853 people who first took an intelligence test in 1947 when they were about 11 years old as part of a group called the Lothian Birth Cohort 1936, and retested them again around 2008 to 2010, when they were in their early 70s. A total of 262 of the seventy-year-old reported having learned at least one language other than English enough to communicate in it. Of those, 195 said they learned it before age 18; 65 said they learned it thereafter. The researchers gave the participants a battery of cognitive tests, including tests of their verbal reasoning, their vocabulary and reading abilities, their verbal fluency and their ability to process information quickly. They found that bilingual speakers performed much better than expected from their baseline cognitive ability, particularly in reading and in general intelligence. And those who knew three or more languages performed even better. Learning a language seemed to make as much difference in people's later-in-life cognitive decline as a gene that's been tied to risk of Alzheimer's disease and smoking habits. These participants mostly learned their second languages after age 11. The results actually make a very compelling point—you don't have to be a fluent speaker of a language to get the benefits, and you can start later in life, too.
11. The phrase "hot potato" in Para. 1 is closest in meaning to ______.
A.a popular topic
B.a difficult situation
C.a heated discussion
D.a delicious dish
A B C D
B
[解析] 含义题。根据文章第一段hot potato破折号后面的信息“it was banned in California by a 1998 ballot measure, which the state Senate is now asking voters to repeal(它在1998年加州的投票表决中被废除,而现在参议院又在要求选民撤销这项决议)”。据此可推断,双语教学在政治上是个棘手的问题。故B项正确。
12. According to Para.2, a new study finds that ______.
A.learning a new language can benefit a lot when you grow old
B.you have to learn a new language at a very young age
C.picking up a new language have few benefits later in life
D.picking up a new language can cause serious health problems
14. It can be concluded from the study that ______.
A.the bilingual speakers perform worse than those who only know one language
B.learning a language may have the risk of Alzheimer's disease or smoking habits
C.people have to speak a new language fluently in order to gain some benefits
D.people can start to learn a new language later in life and still get the benefits
A B C D
D
[解析] 推断题。文章最后一段末句指出“The results actually make a very compelling point—you don't have to be a fluent speaker of a language to get the benefits, and you can start later in life, too(学习一门语言,你不必说得很流利,大脑也可以受益,并且,你完全可以晚一些再学习新的语言)”。故D项正确。
Bill Gates was 20 years old. Steve Jobs was 21. Warren Buffett was 26. Ralph Lauren was 28. These now iconic(偶像的) names were all 20-somethings when they started their companies that would throw them, and their enterprises, into some of the biggest successes ever known. Consider this: many of the truly remarkable innovations of the latest generation—a list that includes Google, Facebook and Twitter—were all founded by people under 30. So what is it about that youthful decade after those awkward teenage years that inspires such shoot-for-the-moon success? Does age really have something to do with it? It does. Young people bring fresh eyes to confronting problems and challenges that others have given up on. 20-something entrepreneurs see no boundaries and see no limits. And they can make change happen. Peter Thiel, the co-founder of PayPal, has another, colder theory that may explain it: Ultimately, it's about money. In other words, it's the young people who have nothing to lose, with no mortgage and, frankly, with nothing to do on a Friday night except work, who are the ones often willing to take the biggest risks. Sure, they are talented. But it's their persistence and zeal(激情), the desire to stay up until 6 a.m. chugging Red Bull, that is the difference between being a salaried employee and an entrepreneur. That's not to say that most 20-somethings are finding success. They're not. The latest crop of super-successful young entrepreneurs, designers and authors are far, far from the norm. In truth, unemployment for workers age 16 to 24 is double the national average. One of the biggest challenges facing this next generation—and one that may prevent more visionary entrepreneurs from succeeding—is the staggering rise in the level of debt college students have been left with. If Peter Thiel's theory is right, it is going to be harder and harder for young people to take big risks because they will be crushed with obligations before they even begin. If you're over 29 years old and still haven't made your world-changing mark, don't despair. Some older people have had big breakthroughs, too. Thomas Edison didn't invent the phonograph(留 声机) until he was 30.
16. The first paragraph is used to show ______.
A.various famous men
B.the age of founders
C.the success of enterprises
D.the success of 20-somethings
A B C D
D
[解析] 推断题。文章第二段首句指出“These now iconic names were all 20-somethings when they started their companies that would throw them, and their enterprises, into some of the biggest successes ever known(这些如今的偶像都在20多岁的时候创立了自己的公司,一举成名,他们的企业也均获得了前所未有的巨大成功)”。故D项正确。
17. Which of the following statements cannot explain the underlined sentence in Para.3? ______
A.20-something entrepreneurs can drive change.
B.20-something entrepreneurs have new perspectives.
C.20-something entrepreneurs do not need to worry about money.
D.20-something entrepreneurs believe there is no obstacle that they can't hurdle.
A B C D
C
[解析] 细节题。文章第三段谈论20多岁的年轻人获得成功的原因,第二句提到“Does age really have something to do with it? It does(年龄真的和这一切有关吗?当然有关)”。C项“20多岁的企业家不需要担心钱”说法不符合文意。故C项正确。
18. All of the following are differences between being salaried employees and entrepreneurs EXCEPT ______.
A.their zeal
B.their talent
C.their persistence
D.their desire to stay up
A B C D
B
[解析] 细节题。文章第四段指出“But it's their persistence and zeal, the desire to stay up until 6 a.m. chugging Red Bull, that is the difference between being a salaried employee and an entrepreneur(他们的坚持和激情,靠猛灌红牛熬通宵干到早上6点的意愿,才是领薪水的雇员和企业家之间的差别)”。B项“他们的天分”并非他们的区别。故B项正确。
19. The biggest challenge that may stop more visionary entrepreneurs from succeeding is that ______.
A.they are confronted with increasing obligations
B.their debts run up alarmingly and very unsteadily
C.they have more mortgage than other college students
D.they have far less wealth than their parents did at the same age