对若干个能各自独立执行的进程来说，它们一定有不同的（）
A.程序
B.工作区
C.进程控制块
D.状态E.活动规律
参考答案：B, C, E
Though the road covered with snow was very smooth, the old man smilingly ____ to be helped by others across the road．
A．refused
B．declined
C．accepted
D．promised
