11. (A) delineation (B) measurement (C) research (D) surgery

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11 opened many eyes around the globe regarding the prevalence of bullying. It was，— 12 , not until the late 1990s that the first systematic and large-scale studies of bullying prevalence were conducted in the United States. In 1998，the National Institute of Child Health and Human Development (NICHD) sponsored a nationally representative survey on bullying of 15,686 students in grades 6 through 10. Overall，30 percent of young people all over the country at the time of the survey were involved in 13 to frequent bullying during the previous couple of months, as perpetrators, victims，or both. Based on these survey data, it was estimated that as many as 3.2 million students 14 were victims of bullying and 3.7 million were bullies. That there were more bullies than victims reflects the common 15 whereby several children gang up on one. Finally, these estimates included 1.2 million who both bullied others and were themselves victims of bullying.

11. (A) delineation (B) measurement (C) research (D) surgery

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