Stack is quite simple. Many computer systems have stacks built into their circuitry. They also have machine-level instructions t

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问题 Stack is quite simple. Many computer systems have stacks built into their circuitry. They also have machine-level instructions to operate the hardware stack. Stack is(73)in computer systems.

选项 A、useless
B、not important
C、simple but important
D、too simple to be useful

答案C

解析 本题含义可表述为,栈是相当简单的,后两句从意思上看是计算机如何实现栈,实际说栈是计算机组成的一个必要的部分,最后一句是对前面三句的归纳。所以应该选择 C(简单并重要的)。
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