电气设备着火时，第一步措施是（）。A.用水灭火； B.用泡沫灭火器灭火； C.切断电

     Being the head of a high school for many years, I grew tired of budget meetings, funding cuts, and
many other administrative chores (零星工作) and started to dream of retirement.Sitting in traffic on a
weekday    morning, I would find my mind 1 . I would imagine spending time with my grandchildren,
quiet evenings with my 2,  traveling,  or rediscovering some great books. I told  myself that I wouldn't 
3 myself  upfor any committees, any classes, or anything requiring a schedule.My first day of retirement
came  4 ! I cooked a great  breakfast  for my wife and me,  _5 read the paper,  cleaned a bit of  the
house, and  wrote  a few letters to friends. On the  second day, I cooked  breakfast,  read the paper.
     On the third day ... This is retirement? I tried to tell myself that it was just the transition (过度),  that
those 6   moments were right round the corner, and  that I would 7 them soon enough.  But something  was 8 . A  former colleague asked me  a 9 .  A group of students were going  to Jamaica (牙买加)
to work with children in the  10 neighbourhood. Would I 11 my new-found "happiness" and return to the
students,  just this once? One trip. That's all.  
     My bags were 12 and by  the door.  The  trip  was  very inspiring. I was  13 not only by the poverty
I saw but also by the sense of 14 of the young people on the trip.  15   I returned   home,  I offered to
work one day a week with a  local youth  organization.The experience   was so positive  that  I was
soon volunteering nearly full-time,working with students across North America to assist them in their 16
work.     
     Now, it seems that the tables have turned.Some days I am the teacher,and other days I am the student.
These young people have reawakened my 17 to social justice issues by 18   me to learn more about the
situation in the world today, where people are still poor and 19because of greed, corruption and war.
Most importantly, they have given me the opportunity to continue to participate in helping to find solutions. In return, I help them do their charitable projects overseas. I've gone from  20 one  school to  helping
oversee (监督) the construction of schools in twenty-one countries!