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閱讀下面短文，簡要回答所給問題。
                                              Thumbs Down to Texting 屈指發短信
     Do you have a mobile phone? Do you send text messages to your friends and family?
    Text messaging or "texting" is becoming very popular. But, scientists have discovered that texting can
  give us problems with our hands. Be careful! Too much texting can cause swelling (腫脹) in our
 thumbs.  Our thumbs were not made for pushing small buttons, over and over.  Scientists call this problem
  RSI.  We spoke to a doctor called Harriet Wilson, who treats many sick people with RSI. She says we
 need to see how much time we are spending in typing text messages.  If we are spending more than 10-15
  minutes at once, we could have problems in the future.
     As mobile phones develop, they are getting smaller with buttons closer together. Texting with a smaller
  phone is worse than using a larger phone with bigger buttons.Using a computer keyboard and playing
 video games can cause the same problem.  So more and more people could find themselves with RSL 
 Among them, most are university students and teenagers, as they do not know the risks of spending so
 much time using computer, video games and mobile phones. If we don't do something about this, too
 many young people could grow up in terrible pain.
    Note: RSI abbr .肢體重復性勞損 (repetitive strain injury).
1. What is becoming very popular now according to the passage?
    ______________________________.
2. Does the word "once" mean "one time" in the second passage?
    ______________________________.
3. What kind of people are easier to have the problem of RSI?
    ______________________________.
4. What can also cause RSI besides texting?
    ______________________________.
5. Which is easier to cause the problem of RSI,  using smaller mobile phones or larger ones?
    ______________________________.