There are more than 300 million of us in the United States, and sometimes it seems like we’re all friends on Facebook. But the s

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问题     There are more than 300 million of us in the United States, and sometimes it seems like we’re all friends on Facebook. But the sad truth is that Americans are lonelier than ever. Between 1985 and 2004, the number of people who said there was no one to discuss important matters with tripled, to 25 percent, according to Duke University researchers. Unfortunately, as a new study linking women to increased risk of heart disease shows, all this loneliness can be detrimental to our health.
    The bad news doesn’t just affect women. Social isolation in all adults has been linked to a raft of physical and mental ailments, including sleep disorders, high blood pressure, and an increased risk of depression and suicide. How lonely you feel today actually predicts how well you’ll sleep tonight and how depressed you’ll feel a year from now, says John T. Cacioppo, a neuroscientist at the University of Chicago and coauthor of Loneliness: Human Nature and the Need for Social Connection. Studies have shown that loneliness can cause stress levels to rise and can weaken the immune system. Lonely people also tend to have less healthy lifestyles, drinking more alcohol, eating more fattening food, and exercising less than those who are not lonely.
    Though more Americans than ever are living alone(25 percent of U. S. households, up from 7 percent in 1940), the connection between single-living and loneliness is in fact quite weak. " Some of the most profound loneliness can happen when other people are present," says Harry Reis, professor of psychology at the University of Rochester. Take college freshmen: even though they’re surrounded by people almost all the time, many feel incredibly isolated during the first quarter of the school year with their friends and family members far away, Cacioppo says. Studies have shown that how lonely freshmen will feel can be predicted by how many miles they are from home. By the second quarter, however, most freshmen have found social replacements for their high-school friends. Unfortunately, as we age, it becomes more difficult to recreate those social relationships. And that can be a big problem as America becomes a more transient society, with an increasing number of Americans who say that they’re willing to move away from home for a job.
    Loneliness can be relative: it has been defined as an aversive emotional response to a perceived discrepancy between a person’s desired levels of social interaction and the contact they’re actually receiving. People tend to measure themselves against others, feeling particularly alone in communities where social connection is the norm. That’s why collectivist cultures, like those in Southern Europe, have higher levels of loneliness than individualist cultures, Cacioppo says. For the same reason, isolated individuals feel most acutely alone on holidays like Christmas Eve or Thanksgiving, when most people are surrounded by family and friends.
    Still, loneliness is a natural biological signal that we all have. Indeed, loneliness serves an adaptive purpose, making us protect and care for one another. Loneliness essentially puts the brain on high alert, encouraging us not to eat leftovers from the refrigerator but to call a friend and eat out. Certain situational factors can trigger loneliness, but long-term feelings of emptiness and isolation are partly genetic, Cacioppo says. What’s inherited is not loneliness itself, but rather sensitivity to disconnection.
    Social-networking sites like Facebook and MySpace may provide people with a false sense of connection that ultimately increases loneliness in people who feel alone. These sites should serve as a supplement, but not replacement for face-to-face interaction, Cacioppo says. He compares connecting on a Website to eating celery: It feels good immediately, but it doesn’t give you the same sustenance. For people who feel satisfied and loved in their day-to-day life, social media can be a reassuring extension. For those who are already lonely, Facebook status updates are just a reminder of how much better everyone else is at making friends and having fun.
    Michael J. Bugeja, a professor of communications at Iowa State University and author of Interpersonal Divide: The Search for Community in a Technological Age, says that the encroachment of digital communication into our social lives can amplify feelings of isolation.
    According to Cacioppo, there’s no magic number for the number of friends you need to avoid loneliness. An introvert might need one confidante not to feel lonely, whereas an extrovert might require two, three, or four bosom buddies. Experts say it’s not the quantity of social relationships but the quality that really matters. "The most popular kid in school may still feel lonely," Cacioppo says. "There are a lot of stars who have been idols and lived lonely lives. "
Which is NOT mentioned in the passage as the reason for Americans’ feeling of loneliness?

选项 A、People find it more difficult to establish social relationships as they are becoming older and older.
B、The increasing mobility of American society nowadays.
C、Certain situational factors may bring about the feeling of loneliness.
D、People inherit loneliness genetically and feel long-term emptiness and isolation.

答案D

解析 事实细节题。根据第五段倒数第一、二句可知,Cacioppo认为长期的空虚和孤独感部分是由基因造成的。遗传的并不是孤独感本身,而是对疏离的敏感程度,而[D]却表述为…inheritloneliness genetically(通过基因遗传继承孤独感),与原文不符,故为答案。根据第三段倒数第二句可知,随着年龄的增长,重建这些社会关系(指前面提到的大一新生通过交新朋友取代高中好友的缺失,重建了社交网络,驱走了孤独感)变得越来越难,[A]“随着年龄的增长,人们发现更难建立社交关系”为引起孤独的原因,故排除;根据第三段最后一句可知,随着越来越多的美国人表示他们很愿意为了工作而一再搬家,美国社会变得更加不稳定,即美国社会本身的流动性使得建立稳定的社交关系较难,从而造成了人们的孤独感有增无减,故[B]“美国当今社会与日俱增的流动性”正确,故排除;根据第五段倒数第二句可知,一定的情景因素可以引发孤独感,[C]“某些情景因素可能会带来孤独感”只是把原文中的trigger替换为近义短语bring about,故排除。
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