单选

●图1是一个逻辑结构框图。根据此图判断S2、S1、S0为 (56) 时，Fi必为0。S2、Sl、S0为 (57) 时，逻辑运算Fi=Xi+Yi成立(图中的符号说明：&为逻辑与，≥1为逻辑或，=1为异或)。
图1
（56）A．0 0 0 B．0 0 1 C．0 1 0 D．0 1 1
（57）A．1 0 0 B．1 0 1 C．1 1 0 D．0 1 0

试题出自试卷《2011年程序员考试考前密卷（六）-上午试题》

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