零地址指令的操作数一般隐含在（C ）中。
A. 磁盘
B. 磁带
C. 寄存器
D. 光盘
以下4种类型指令中，执行时间最长的是（）。
A. RR型
B. RS型
C. SS型
D. 程序控制指令
In general, pause refers to __________ between parts of an utterance.
A. the loudness
B. the length of silence
C. the clarity
D. the sonority
The speaker must handle pauses with skill to suit __________.
A. speaker's or hearer's needs
B. speaker's identity
C. hearer's emotions
D. speaker's and hearer's ideas
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