问题 单项选择题

Pentium微处理器进行存储器读操作时,在时钟周期T1期间,完成下列哪一项操作

A.W/R信号变为高电平

B.发送存储器地址

C.读操作码

D.读操作数

答案

参考答案:B

解析:Pentium微处理器主要的总线周期一存储器周期包括T1和T2两个时钟周期。T1期间,微处理器向数据/地址复用的总线上输出地址信息,以指示寻址的存储单元或I/O设备的端口地址;T2期间用来读/写总线上的数据。

单项选择题
阅读理解

My grandmother seems to be wrong when she says that good manners will never go out of style.

Several days ago, I tried entering a lift with one of my arms fixed in a bandage(绷带) while carrying a computer bag in the other. Not being fast enough, I was passed by two young people who managed to get into the lift before me. The lift door closed only after I entered. Having already pressed their wanted floor button, the young people waited impatiently for me to press the button for where I was going. If they had decided to help, we could have moved much faster. But they had not. So I did my best and pressed the button with my arm. The two young people looked very angry with me. I was losing heart.

The memory of this incident has stayed with me because it followed shortly after my building’s watchman refused to help me carry a heavy box full of books. His answer was that he could not carry the books a few meters because it was not his job. However, I remembered myself helping people for so many years carrying boxes, shopping bags, or pushing wheelchairs upon the request of a stranger in need or when my conscience(良心) called on me. "Oh, this young generation, they have no manners, ”my grandmother would say. The idea of good manners refers to the considering of other people’s feelings. We need more and more people to have good manners. Good manners should be-come part of our lives.

小题1:The author believes that ________.

A.good manners will never go out of style

B.her grandmother is right

C.good manners are disappearing little by little

D.it never rains, but it pours小题2:How did the two young people feel when the author pressed the button?

A.Excited.

B.Angry.

C.Sad.

D.Confident.小题3:The watchman didn’t help the author because ______.

A.the box was full of books

B.the box was too heavy

C.the author was a stranger

D.he thought it was not his job小题4:We can infer from the passage that the author ______.

A.always offers help to people in need

B.always has difficulty carrying things

C.has a better memory than anyone else

D.agreed with her grandmother at first