Social networks are a big part of nearly every teenagers life in this day and age. Many teens have QQ，WeChat，or Weibo but little do a lot of teens know that they can be held responsible for everything they post for the rest of their lives. Everything you post online is part of a digital footprint that can always be traced(追踪）back to you. That includes every post，even like, comment，favorite and forward that you have ever committed. All pictures you’ve posted or will post have been stored in a digital database, and it is the companies' right to keep all of these documents that you believe to have been deleted or hidden.
With every post comes a consequence； whether it is good or bad, what you post could be seen by anyone. That is why you have to be very careful of what you decide to post or comment.
If you think you are safe from Servite finding out about one funny comment you made six months ago on a meaningless picture, you are probably wrong. Recently, a senior, Aaron, at Servite learned this lesson the hard way this year. He wrote a series of ugly comments towards Connelly girls on a web page, ignoring potential consequences.
This student, however, did have to face consequences from Servite as he was removed from all of his leadership roles in the school. Surprisingly enough, he fully agreed with his punishment handed down by the administration and fully understood why he was given such severe discipline(惩处）."When you agree to come to Servite, you arc agreeing to defend what Servite stands for，" the young man said. "That continues past the hours of 8 am and 2 pm. It’s at all times.
So，next time you’re about to post something you think could be received as offensive or inappropriate, think twice, think again, and don't press send.
28. What does the author think the teens should do in the first paragraph?
A. Avoid using social media.
R. Remove their own digital documents.
C. Be responsible for what they put online.
D. Learn to balance their online and offline time.
29. What mistake did Aaron make online?
A. Drawing some meaningless pictures.
B. Making some bad comments.
C. Failing to take his lesson.
D. Breaking down a special web page.
30. What did Servite do with Aarons case?
A. It reached an agreement with Connelly girls.
B. It helped Aaron get rid of ill effects.
C. It gave Aaron a severe punishment.
D. It stood on Aarons side.
31. For whom is the text probably intended?
A. Teenagers. B. Teachers. C. Parents. D. Network engineers.