（）就是对系统中的进程实施有效的管理，通过使用进程创建、进程撤消、进程阻塞、进程唤醒等控制原语来实现。
参考答案：进程控制
English is a language shared by several diverse cultures, _________ uses it differently.
A．all of which
B．each of which
C．all of them
D．each of them
Mary kept weighing herself to see how much ____ she was getting. [ ]
A. heavier
B. heavy
C. the heavier
D. the heaviest
