51. What does the author mean by saying “Teenagers at risk of depression, anxiety and suicide often wear their troubles like a neon sign” (Lines 1 - 2, Para.1 ) ?
- A. Mental problems can now be found in large numbers of teenagers.
- B. Teenagers' mental problems are getting more and more attention.
- C. Teenagers' mental problems are often too conspicuous not to be observed.
- D. Depression and anxiety are the most common symptoms of mental problems.
答案：C
答案句：Teenagers at risk of depression, anxiety and suicide often wear their troubles like a neon (霓虹灯)sign. Their risky behaviors--drinking too much alcohol, using illegal drugs, smoking cigarettes and skipping school--can alert parents and teachers that serious problems are brewing.
参考译文：有抑郁、焦虑和自杀风险的青少年常常像霓虹灯一样把自己的烦恼显露出来。他们的危险行为——酗酒、使用非法药物、吸烟和逃学——可以提醒家长和老师，严重的问题正在酝酿之中。
定位线索：题干“wear their troubles like a neon sign”→答案句首句“wear their troubles like a neon sign”；文中“neon sign”（霓虹灯，显眼）对应选项C“too conspicuous not to be observed”（太显眼而不被忽视）。
解析：题干问第一段中“wear their troubles like a neon sign”的含义。答案句首句直接给出该短语，随后第二句列举了酗酒、吸毒、吸烟、逃学等行为，并说这些行为“can alert parents and teachers”，说明这些麻烦是显而易见的、容易被注意到的。选项C“too conspicuous not to be observed”（太显眼而不被忽视）正是对“neon sign”和“alert”的同义转述。选项A“大量青少年”、B“越来越受关注”、D“最常见症状”均无原文依据，属于无中生有。
53. Why do the researchers refer to teens who use tons of media, don't get enough sleep and have a sedentary lifestyle as the “invisible risk” group?
- A. Their behaviors can be an invisible threat to society.
- B. Their behaviors do not constitute a warning signal.
- C. Their behaviors do not tend towards mental problems.
- D. Their behaviors can be found in almost all teenagers on earth.
答案：B
答案句：Because their behaviors are not usually seen as a red flag, these young people have been dubbed the “invisible risk” group by the study's authors.
参考译文：因为他们的行为通常不被视为危险信号，这些年轻人被研究作者称为“隐形风险”群体。
定位线索：题干“why...referred to as 'invisible risk' group”→答案句“Because their behaviors are not usually seen as a red flag”；文中“not usually seen as a red flag”对应选项B“do not constitute a warning signal”（不构成警告信号）。
解析：题干问为什么被称为“隐形风险”群体。答案句直接给出原因：“their behaviors are not usually seen as a red flag”，即行为不构成危险信号。选项B“他们的行为不构成警告信号”正是对“not seen as a red flag”的同义转述。选项A“对社会构成隐形威胁”、C“不倾向于心理问题”、D“几乎所有青少年都有”均无原文依据，属于无中生有。
54. What does the new study find about the invisible group?
- A. They are almost as liable to depression as the high-risk group.
- B. They suffer from depression without showing any symptoms.
- C. They do not often demonstrate risky behaviors as their peers.
- D. They do not attract the media attention the high-risk group does.
答案：A
答案句：But the invisible group wasn't far behind the high-risk set, with more than 13% of them exhibiting depression.
参考译文：但隐形群体与高风险群体相差不远，其中超过13%的人表现出抑郁症状。
定位线索：题干“what does the new study find about the invisible group”→答案句“the invisible group wasn't far behind the high-risk set”；文中“wasn't far behind”对应选项A“almost as liable to depression as the high-risk group”（几乎与高风险群体一样容易抑郁）。
解析：题干问新研究关于隐形群体的发现。答案句明确指出隐形群体“wasn't far behind the high-risk set”，且超过13%表现出抑郁，与高风险群体（近15%）相差无几。选项A“他们几乎与高风险群体一样容易抑郁”正是对“wasn't far behind”和具体数据的概括。选项B“没有症状”与原文“exhibiting depression”矛盾；C“不像同龄人那样表现出危险行为”、D“没有引起媒体关注”均无原文依据，属于无中生有。