一堆火柴有2010根，甲、乙二人轮流取火柴（甲先取），每次只允许取出2k根火柴（k=0，1，2，…），谁取到最后一根火柴谁胜，则( )一定能取胜．
乙
Measures have to be taken to teach young people how to ______ themselves both in family and in school. They don't know the basic manners. [ ]
A. do
B. perform
C. behave
D. work
变更接线或试验结束，应（）试验电源，并将升压设备的高压部分放电、短路接地。
