执行返回指令，退回中断服务程序，这时返回地址来自( )。
A．堆栈区 B．ROM区C．程序计数 D．CPU的暂存寄存器
参考答案：A
看图，用适当的单词完成对话。
1. A: _____ _____ are your black _____ ?
B: They are ten dollars.
2. A: _____ is your brother?
B: He is _____ the tree.
3. A: When is your_____ ?
B: It's October seventh. And today is October seventh.
A: Oh! _____ _____ to you!
B：Thank you.
4. A: What _____ of movies does her grandmother like?
B: She likes Beijing _____.
麦茬稻高产栽培，株型松散的大穗型品种适宜穗数（）万/亩。
A.20-24
B.24-28
C.28-32
D.32-36
