3新闻标题[OL].16 July 2011.http://baike.baidu.com/view/3390492.htm.
4A Tip Becomes a Twitter Torrent [OL].17 July 2011.http://www.nytimes.com/ 2011/07/16/sports/torrent-on-twitter-in-support-of-espns-bruce-feldman.html?_r= 1 &scp=2&sq=Twitter&st=cse.
5Europe leaders to meet on debt crisis [OL].16 July 2011.http://www.chinadaily. com.cn/world/2011-07/16/content_ 12915179.htm.
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7Peter Goodspeed: Karzai assassination raises many questions few answers [OL]. 15 July 2011. http://fullcomment.nationalpost.com/2011/07/12/peter-goodspeed- karzai-assassination-raises-many-questions-few-answers/.
