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问题 单项选择题

使用两个8259A进行级联，最大可以获得的有效硬件中断源的个数为()。

A．4个

B．8个

C．16个

D．15个

答案

参考答案：D

解析：使用两个8259A进行级联，最大可以获得的有效硬件中断源的个数为15个(其中有一个引脚用做级联了)。

阅读理解

阅读理解。                                      

                                                                     Happy Sunday

      It is Sunday. Mary, Susan, Bob and I are at the zoo. We see birds, horses, bears and monkeys.

The monkeys are very funny. We look at them and they look at us. They take some bananas from

our baskets ! They are happy, but we aren't.

单词快递：funny滑稽可笑的horse马basket篮子

句型点击：They take some bananas from our baskets.

它们从我们的篮子里拿走了一些香蕉。

判断正误，对的写“T”，错的写“F"。

( )1. The children are at the zoo.

(     )2. They look at the monkeys but the monkeys can't see them.

(     )3. They give the monkeys some peanuts.

(     )4. They can see birds, horses, bears and monkeys.

(     )5. There are three children in the passage (文章).

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单项选择题

我国最先出现的纸币是（）。

A.元代的"宝钞"

B.元代的"交子"

C.宋代的"宝钞"

D.宋代的"交子"
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