问题 单项选择题

在CPU和主存间设置cache存储器主要是为了 (14) 。若使用基于数据内容进行访问的存储设备作为cache时,能更快决定是否命中。这种地址映射方法称为 (15) 映射。CPU向cache执行写操作时,可以同时写回主存储器或者仅当cache中该数据被淘汰时才写回主存储器,前者称为 (16) ,而后者称为 (17) 。若cache的存取速度是主存存取速度的10倍,且命中率可达到0.8,则CPU对该存储系统的平均存取周期为 (18) T(T为主有的存取周期)。

A.相联

B.内容

C.直接

D.间接

答案

参考答案:A

阅读理解

Here are two stories from different parts of the world. They seem strange but, believe it or not, they re all true!

John Lee was an Englishman who refused to be hanged! In 1884 the police said Lee had killed an old woman who he used to work with. There was nothing to show that Lee had killed the woman. Lee told the police he hadn’t done it, but no one believed him and he was going to be hanged. On the day of the hanging, however, the door in the floor, through which Lee’s body would fall, did not open. They tried three times but each time the door stayed closed, even though it had worked well the day before. In the end they sent Lee back to prison, where he lived for the next twenty-two years. At all times, John Lee said he hadn’t killed the woman, and he believed it was the "hand of God" that had saved him from death by hanging.

The police in Venezuela (委内瑞拉)in South America followed a man home one night. He was the thief they wanted to catch. However, half of his house was standing in Venezuela and the other half was standing in Colombia (哥伦比亚). Venezuela’s neighbor. When the police entered the house, the man ran upstairs to his bedroom, which was in Colombia, and called his lawyer (律师). The Venezuelan police were not allowed to enter Colombia so they could not enter the bedroom. They asked the police in Colombia to help. The Colombian police refused to help because the man’s crime (罪行)was not a crime in Colombia. In the end, the Venezuelan police gave up and went back to the police station.

小题1:The underlined(下划线) word "hanged" in this passage probably means _.

A.shut in a room »

B.questioned by the police

C.killed by putting a rope around the neck

D.kept in a place小题2: What do we1 know about the door in the floor?

A.It had opened the day before the hanging.

B.It had been broken a long time.

C.After three times, it opened.

D.John Lee’s dead body fell through it.小题3:From the story we know that the thief’s bedroom was____.

A. in Venezuela B. in Colombia

C. in neither Venezuela nor Colombia I), in both Venezuela and Colombia

小题4:Why didn’t the Venezuelan police go into the man’s bedroom?

A.They didn’t know where it was.

B.The Venezuelan police were not allowed to enter Colombia.

C.The police in Colombia told them that (hey would help.

D.The police in Colombia told them not to go inside.小题5: The police in Colombia didn’t help the police in Venezuela to catch the thief because

A.they didn’t know where he was

B.the police in Venezuela didn’t ask for help

C.the man’s lawyer told them not to help

D.the man’s crime was not a crime in Colombia

多项选择题