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  3. It’s no secret that scrolling through endless images and announcements of engagements, vacations, new babies and job promoti

It’s no secret that scrolling through endless images and announcements of engagements, vacations, new babies and job promoti

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问题    It’s no secret that scrolling through endless images and announcements
   of engagements, vacations, new babies and job promotions can make you
   feel like you’re not accomplishing anything. But it’s pretty much
   impossible to log off forever and never look back on. 【S1】______
   Here’s the good news: There might be a sweet spot when it comes to
   the amount of time you spend on social media. Keep your use down to just 【S2】______
   30 minutes a day can lead to better mental health outcomes, according to
   research being published in December in the Journal of Social and Clinical
   Psychology.
   Researchers from the University of Pennsylvania monitored the
   participants’ social media use for a week cross three platforms—Facebook, 【S3】______
   Instagram and Snapchat—to get a baseline. Then researchers gauged the
   students’ mental health based on seven different factors: social support,
   fear of missing out, loneliness, self-acceptance, self-esteem, anxieties, 【S4】______
   and depression. Next, the authors separated the students from groups and 【S5】______
   conducted the experiment for three weeks. One group was told to keep
   using social media as usually: another group was tasked with limiting 【S6】______
   social media use to 10 minutes per platform a day.
   Researchers then looked at why the students fared in the seven 【S7】______
   categories after the experiment. When study volunteers cut down their
   social media use to 30 minutes per day total, they experienced a
   " significant improvement in well-being" , exhibiting reduced loneliness
   and depression, the authors wrote.
   There are a few caveats with this study: The participants only used
   iPhones in the experiment. The study also only monitored students who
   used Instagram, Facebook and Snapchat, but it doesn’t reflect experiences 【S8】______
   with other social media platforms.
   All that aside, there is something to be said for limiting social media
   while still being realistic about the fact you’re never going to ditch it 【S9】______
   entirely. Research has shown that excessive Facebook use can contribute to
   increase depression and loneliness, and a 2014 study found that social 【S10】______
   media use can create social comparison, which can lead to lower self-
   esteem.
【S1】
选项
答案on一去掉on
解析 介词冗余。本句意为“但要永远不再登录并再不回头几乎是不可能的。”look back与look back on均有“回想，回头，回忆起”的意思，用在此处均符合语义，但由于on是介词，其后必须接宾语，而此处并无宾语，故删去on。
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