He _ the Young Pioneer in 2005.[ ]
A. took part in
B. joined
C. joined in
答案：B
存储器是计算机系统的记忆设备，它主要用来______。
A．存储程序
B．存储数据
C．存储指令
D．上述Ｂ)和Ｃ)
失业保险制度兼有社会救济和社会化管理两种性质。
