单选题 . 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.
But a new study finds that there's another group of adolescents who are in nearly as much danger of experiencing the same psychiatric symptoms: teens who use tons of media, don't get enough sleep and have a sedentary (不爱活动的) lifestyle.
Of course, that may sound like a description of every teenager on the planet. But the study warns that it is teenagers who engage in all three of these practices in the extreme who are truly in jeopardy. 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.
"In some ways they're at greater risk of falling through the cracks," says researcher Vladimir Carli. "While most parents, teachers and clinicians would react to an adolescent using drugs or getting drunk, they may easily overlook teenagers who are engaging in inconspicuous behaviors."
The study's authors surveyed 12,395 students and analyzed nine risk behaviors, including excessive alcohol use, illegal drug use, heavy smoking, high media use and truancy (逃学). Their aim was to determine the relationship between these risk behaviors and mental health issues in teenagers.
About 58% of the students demonstrated none or few of the risk behaviors. Some 13% scored high on all nine of the risk behaviors. And 29%, the "invisible risk" group, scored high on three in particular.. They spent five hours a day or more on electronic devices. They slept six hours a night or less. And they neglected "other healthy activities."
The group that scored high on all nine of the risk behaviors was most likely to show symptoms of depression; in all, nearly 15% of this group reported being depressed, compared with just 4% of the low-risk group. But the invisible group wasn't far behind the high-risk set, with more than 13% of them exhibiting depression.
The findings caught Carli off guard. "We were very surprised," he says. "The high-risk group and low-risk group are obvious. But this third group was not only unexpected, it was so distinct and so large—nearly one third of our sample—that it became a key finding of the study."
Carli says that one of the most significant things about his study is that it provides new early-warning signs for parents, teachers and mental health-care providers. And early identification, support and treatment for mental health issues, he says, are the best ways to keep them from turning into full-blown disorders.1. 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.

【正确答案】 C

【答案解析】 根据原句直接定位至第1段。
题目实际是询问首句的意思，其中关键是对neon sign“霓虹灯信号”的理解。此处可根据下文内容进行推断。第1句提到这些青少年的危险行为(risky behaviors)，如酗酒、吸烟等，可以引起家长和老师的警惕(alert)。而文章在第2至4段提到另外一类行为，如沉迷媒体、睡眠不足、久坐，作者将这些行为形容为not usually seen as a red flag“不起警示作用”、invisible“隐形的”、easily overlook“易被忽略”、inconspicuous behaviors“不明显的行为”。由此结合“霓虹灯”可知，首段提到的第一组行为是明显的，不易被忽略的，故C项“青少年的精神问题通常很明显，易被发现”正确，且注意其中的conspicuous正好是原文inconspicuous的反义词。
从“霓虹灯”本身特点：非常耀眼、常用作招牌、在夜间吸引顾客，也可推断“霓虹灯”的意思应该是“较为明显的……”。注意文中用like a neon sign来修饰wear，即用“霓虹灯”来比喻青少年表现问题的方式，而不是想说他们有精神问题，故A项“很多青少年都有精神问题”不对。B项“青少年的精神问题得到越来越多的关注”偏离重点，文中是说症状足够明显，能引起关注，而非引来越来越多关注。D项“抑郁和焦虑是最常见的精神问题症状”也是偏离主题，文章只是用抑郁症和焦虑作心理问题的举例，至于它们是否是最常见的症状，文中并没有提到。
[参考译文] 患上抑郁症、焦虑症和自杀风险的青少年常常会像霓虹灯一样，清楚地显示他们身处麻烦。他们的危险行为，如酗酒、吸毒、吸烟和逃学，提醒着父母和老师，严重的问题正在酝酿之中。
但一项新的研究发现，另一种青少年很可能同样面临着类似的精神症状：他们沉迷于网络媒体，没有足够的睡眠，而且不爱活动。
当然，这听起来像是对地球上每个青少年的描述。但该研究发出警告，将这三项习惯进行到极端状态的青少年会面临真正的危险。因为他们这些行为通常不被视作危险的信号，所以研究的作者将这类人称为“隐形风险”组。
研究员弗拉基米尔·卡利说：“在某种程度上，他们的行为更容易被忽视。虽然大多数家长、教师和临床医生会对吸毒或醉酒的青少年采取行动，但他们可能容易忽视青少年的这些不明显的行为。”
该研究的作者调查了12395名学生，并分析了九种危险行为，包括过度饮酒、吸毒、重度吸烟、沉迷媒体和逃学。他们的目的是确定这些风险行为和青少年心理健康问题之间的关系。
约58%的学生没有或几乎没有表现出危险行为。约有13%的学生在所有九个危险行为中得分都较高。而29%的学生属于“隐形风险”组，尤其在以下三项中得分非常高：每天花费五个小时或以上在电子设备上；每晚睡6小时或更少；忽视“其他健康活动”。
在所有九种危险行为中得分最高的组最可能有抑郁症的症状：该组中，合共有近15%的学生表示抑郁，而低危组只有4%。但是隐形风险组并不落后于高风险组，其中超过13%的学生有抑郁症状。
调查结果是卡利没有想到的。“我们非常惊讶，”他说：“高危组和低危组是否有症状的答案非常明显。但这第三组的结果不仅出乎意料，而且特点鲜明，占比大(近三分之一)，它成为这次研究的关键发现。
卡利说，这次研究最重要的一点是，它为父母、教师和治疗精神疾病的医护人员提供了新的预警信号，而尽早识别并提供帮助和治疗，是防止精神问题恶化成精神完全失常的最好方法。