根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中的两项为多途选项。
More than half of young black men in the United States do not finish high school. Many grow up without
fathers and in neighborhood with gangs, drugs and violence. Sixty percent of those who drop out of school
have spent time in prison by the age of thirty-five.
Joe Marshall co-founded the Omega Boys Club in San Francisco, California twenty-three years ago. He
tries to give these children a safe refuge (避难所) and a better future. 1_____. Twice a week, it offers after-
school classes in math, reading family and life skills, and college preparation. In many ways, it serves as a
kind of family. It provides teenagers with structure and support.
Mr. Marshall spent twenty-five years as a teacher and administration in San Francisco. 2_____ He sees
gangs and violence as a disease that needs to be dealt with as a public health problem.
"We tell them to follow some new rules for living. 3_____." The Club represents what he calls the "alive
and free movement." 4_____ In 1991, Joe Marshall started "Street Soldiers", a weekly call-in show.
Marlena was one of the graduates of the Omega Boys Club. "She's at Southern University right now, going
into her third year. She talked about what she had learned the hard way and how we help her learn that by
coming to Omega, by listening to 'Street Soldiers '. 5_____" Joe Marshall said.
Mr. Marshall is sixty-three this year and he wants to build an institution. "I'm not going to be here forever,
so my big thing is to make sure this goes on."
A. She said she had learned how to love herself.
B. That's what these young people get in the street.
C. A lot of my former students ended up in prison for selling drugs.
D. But his most effective way to spread his anti-violence message is through radio.
E. The Omega Boys Club serves more than four hundred young people every year.
F. He taught math in middle school and expected to see his best students go to school.
G. These rules will decrease their chances of ending up dead or in prison and increase their chances
dramatically of staying alive and free.
，用C装置收集O2，即用排水法收集氧气时，当集气瓶口有气泡向外冒出时说明已经集满；