Stack is quite simple. Many computer systems have stacks built into their circui
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.
A．useless
B．not important
C．simple but important
D．too simple to be useful
正确答案：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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