Four experts, who held master's or doctoral degrees in consulting and psychology, assessed the bloggers' social and emotional condition by way of their blog posts. Students were assessed as having a poor social and emotional state if they wrote a lot about personal problems or bad relationships or showed evidence of low self-esteem.

　　Self-esteem, social anxiety, emotional stress and the number of positive social behaviors improved significantly for the bloggers when compared to the teens who did nothing and those who wrote private diaries.Bloggers who were instructed to write specifically about their difficulties and whose blogs were open to comments improved the most. All of these results agreed with the two month follow-up.

　　The authors admitted that the skewed（有偏向的）sex rate was a limitation to the study. However, the researchers analyzed the results separately by sex and found that boys and girls reacted similarly to the experiment and there were no major differences. They said future research should attempt to control the subjects for sex.

　　50．The selection of students for the experiment was largely based on.　

　　　 A．their social relationships　 B．their self-esteem

　　　 C．their problems in social life　D．their willingness to fill out a question naire

　　51．What’s the function of“controls” (Paragraph 4) in the experiment?

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