听力原文:M: Um, Mary, could you tell me how to use this cassette recorder, please?
W:OK. Well, first of all, you have to plug it into the power supply.
M: Yeah, I see.
W: Once you've done that... you don't need to switch anything on.
M: How do you open it?
W: Well, you have to press the little button that says eject.
M: This one here?
W: That's right. That's it.
M: Like that?
W: Yeah. After you've done that, then you load the cassette. Make sure that you've got the right side of the tape facing you and not away from you. Then you should close the cassette flap.
M: Like that?
W: Yeah, that's right. And then you must remember to press the play hutton to set it to work.
M: That one on the right?
W: Yes, that's it.
M: Like that?
W: Right! It won't go down unless you push hard.
M:I know. Those old models are all like that.
W: That's just what you must do.
M: Yes. But how about this red thing here?
W: That's the record switch. Be careful not to press it when you're playing, because if you do you'll wipe off whatever is on the tape.
M: Oh, I see. So that's the record and this is the rewind.
W: Exactly. If you want to rewind, then you have to press it down.
M: And then stop it here.
W: That's it. You've got it.
What must you make sure when you load the cassette?
A.That you open the recorder.
B.That you get the power supply.
C.That you get the right side of the tape facing you.
D.That you switch the recorder on.
第1题
计算机指令系统往往具有多种寻址方式。直接寻址方式指(111),立即数寻址方式指(112);寄存器寻址方式是指(113)。假设基址寄存器的内容为2000H,变址寄存器的内容为 03A0H,指令的地址码部分为2BH,当前正在执行的指令所在地址为3A00H。若采用相对寻址方式,操作数实际地址为(114)。若采用变址寻址,并考虑基址时,数据的实际地址为(115)。
A.操作数在CPU中
B.操作数地址在指令中
C.操作数地址在寄存器
D.操作数就是指令的一部分
第2题
计算机指令系统往往具有多种寻址方式。操作数就是指令的一部分称为(1)寻址,操作数地址在指令中称为(2)寻址。当操作数地址在寄存器中,就采用(3)寻址方式。假设基址寄存器的内容为2000H,变址寄存器的内容为03AOH,指令的地址码部分为3FH,当前正在执行的指令所在地址为2B00H。若采用相对寻址方式,则数据实际地址为(4)。若采用变址寻址,并考虑基址,数据的实际地址为(5)。
A.直接
B.运算器
C.立即数
D.指令
第3题
A.23A0H
B.4B00H
C.283FH
D.23DFH
第4题
执行指令时,以寄存器的内容作为操作数的地址,这种寻址方式称为()寻址。
A.寄存器
B.相对
C.基址变址
D.寄存器间接
第5题
若指令中的地址码为A,变址寄存器为X,基址寄存器为B,则变址间址寻址方式的操作地址N=(5)。
A.X+(A)
B.((X+B)+A)
C.(X+A)
D.((X)+A)
第6题
在80386以上的微处理器指令系统中,以下指令的源操作数的寻址方式是()。 MOV AX,[BX)[SI]
A.基址变址寻址
B.寄存器寻址
C.寄存器间接寻址
D.寄存器相对寻址(变址寻址)
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