题目内容

8259A的OCW1----中断屏蔽字( )设置。

A. 在ICW之前
B. 只允许一次
C. 可允许多次
D. 仅屏蔽某中断源时

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当采用（）输入操作情况下，除非计算机等待数据准备好，否则无法传送数据给计算机。

A. 无条件传送方式
B. 程序查询方式
C. 中断方式
DMA方式

简述中断处理过程？

There are ten sentences in this section. Beneath each sentence there are four choices or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentences.Tom and Dick were both heroes, but only ________ is remembered today.

A. the later
B. the latter
C. latter
D. later

The watch is _________ about eighty yuan.

A. worthy
B. worthwhile
C. worth
D. worth of