— your CDs?
—On the TV. [ ]
A. Were
B. Where's
C. Where are
D. What are
答案：C
_____ May 27th,2008,millions of people watched the Beijing Torch Relay in
Nanjing. [ ]
A. On
B. In
C. At
D. For
在操作系统的进程管理中，若系统中有10个进程使用互斥资源R，每次只允许3个进程进入互斥段(临界区)，则信号量S的变化范围是______。
A．-7～1 B．-7～3 C．-3～0 D．-3～10
