以下哪种状态表示进程处于睡眠状态，直到满足某个条件才会被唤醒?
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默认情况下，如果没有为ps命令传递任何参数，则它将打印什么信息?
All processes running on the terminal
B. All active processes
C. All sleeping processes
D. All processes run by the current shell
E. All processes run by the current user
Peter想找出是什么应用导致系统运行缓慢，他应该使用以下哪种工具类显示当前所有运行中的进程占用CPU的情况?
A. top
B. ps
C. lsof
D. free
E. uptime
Carol通过ps命令找到了某个进程的PID后，应该使用哪个工具来停止执行该进程?
A. killall
B. pkill
C. TERM
D. kill
E. pgrep
以下对/proc最好的描述是?
A. /proc contains information about files to be processed.
B. /proc contains configuration files for processes.
C. /proc contains information on currently running processes, including the kernel.
D. /proc contains variable data such as mail and web files.
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