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28. How did James Garbarino probably feel after interviewing the shooters' parents and brother? A. Excited. BConfused. C. Disappointed. D. Satisfied. 29. What suggestion is made about mass shooting in Paragraph 3? A. People are to be tested to see if they tend to commit suicide Guns should he taken away from those who have committed crimes C. Research should be done to find out practical policy to cut mass shooting. D Laws are to be made to prevent mass shooters from communicating threats to others. 30. What can we learn about mass shooting from the passage? A. Most of the mass shooters are young men B Nowadays mass shooters can he casily labeled. C. Childhood violence is the most import ant factor. D Mass shooting has not been paid enough attention to. 31. What does the underlined word "traits" in Paragraph probably mean? A. Figures B Features C Possibilities. D. Phenomena.