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  3. Using Facebook makes people sadder, at least according to some research. But just what is it about the social network that takes

Using Facebook makes people sadder, at least according to some research. But just what is it about the social network that takes

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问题    Using Facebook makes people sadder, at least according to some research. But just what is it about the social network that takes a hit on our mood? A study of the different ways of interacting with the site now offers an answer: Grazing on the content of other people’ s idealized lives may make reality painful.
   Scientists have long debated Facebook’ s impact on users’ in-the-moment mood as well as their deeper satisfaction with life. Some studies have found that the site makes us happier; others, sadder.
   One of the problems is that most studies were cross-sectional, taking a snapshot of people at one point of time. But that makes it difficult to separate our use of Facebook from the many other factors known to affect well-being, from overwork to romantic meltdowns. A 2013 study led by Ethan Kross, a psychologist at the University of Michigan, sidestepped this problem by studying people’ s use of Facebook over time, surveying them about their well-being five times per day for 2 weeks. The conclusion was that the more you use Facebook, the sadder you get.
   That study generated an enormous amount of attention. But the results offered no clue to what it is about the social network, or how people are using it, that might have this negative effect.
   Since then, a collaboration of labs including Kross’ s has tried to tease apart the mechanisms. The researchers performed an "intervention," using subjects’ personal Facebook accounts in specific ways. After all, interaction with Facebook consists of a whole set of activities, from browsing photos and "liking" websites to directly interacting with others through messages and comments.
   Last week, Kross shared a sneak preview of his team’ s results. Their findings suggest that there is no effect on well-being if one "actively" uses Facebook. When subjects directly interacted with the social network by posting status updates, sharing content, and messaging others, their mood stayed the same over the course of a day. But the negative impact on well-being that Kross discovered in his 2013 study reappeared for individuals who were made to "passively" use the site—just browsing through photographs of other people’ s happy moments, reading people’ s conversations, and not contributing anything.
   "Using Facebook is not bad for well-being per se," Kross concluded, but "grazing" its content is. Possible reasons for this were bounced around by the audience of psychologists. For example, one theory holds that people post idealized versions of themselves on Facebook, and comparing those to your own real-world life is toxic if you don’ t take part in the online theater.
Ethan Kross’ s 2013 study failed to find______.
选项 A、how people use social network
B、whether people will get sad when they use Facebook
C、what it is about Facebook that might have negative effect
D、when people get sad during the use of Facebook
答案C
解析 细节题。根据题干关键词定位到第三、四段。第三段最后一句提到了实验结果。第四段But the results offered no clue to what it is about the social network，or how people are using it，that might have this negative effect．则提到了实验的缺陷，即研究结果并没有指出究竟是社交网络的哪一方面，或者人们怎样使用社交网络会带来消极影响。因此，正确答案是C。
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