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设(AX)=1234H，(BX)=5678H，执行下列指令后，AL的值应是(    )。
   PUSH AX
   PUSH BX
   POP AX
   POP  BX
   A．12H    B．34H    C．56H D．78H

A.12H
B.34H
C.56H

【参考答案】

D用栈操作指令实现AX，BX中内容的交换；执行指令后(AX)=5678H，(BX)=1234H：因此AL=78H。
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