问题 单项选择题

在下列叙述中,正确的一条是( )。

A.现代微型计算机中的cache存储器一般分成两部分,它们的功能完全不同

B.cache存储器有几种类型,如二级cache(即通常所说的高速缓冲)使用的直接对应式和多关联式,多关联式(一级cache更多使用)又有双关联式和四关联式等

C.离CPU越近,数据位越窄,cache的存取速度就越快

D.cache存储器基本上由两部分构成,一部分存放由主存而来的数据,另一部分存放这些数据在主存中的对应地址信息(这部分又叫高速存储器目录)

答案

参考答案:D

解析:cache存储器基本上由两部分构成,一部分存放由主存而来的数据,另一部分存放这些数据在主存中的对应地址信息(这部分又叫高速存储器目录)。

阅读理解

阅读理解。

     Jackie Joyner-Kersee had a serious asthma attack while running a race at the 1994 U. S. Olympic Festival.

     "I wasn't afraid of running; I was afraid I might die," said Joyner-Kersee. "I said 'Don't be afraid. . . just

hold on."

     So, what is asthma? It's a health condition that causes difficulty in breathing. Although it comes and goes,

once you have asthma, you have it for a long time. Different treatments are used for asthma. There are very

strong drugs that can be taken for a long time with few side effects. Today, even people with serious asthma

can take part in sports.

     Joyner-Kersee has had problems with asthma for many years. She said, "I didn't have this as a little girl.

It wasn't until I went to California that I noticed it, and then I didn't want to accept it. When I start feeling

good, I stop taking the medicine. It will be all right. . . . I hope. "

     The race was supposed to start at.5:35 p. m. At 5:00, she began to have trouble breathing. She was

given a breathing test and treatment by a doctor. She said she thought about not running. She was out of

breath.

     "It's just hard running with asthma," she said. "When I experienced this in practice. I couldn't breathe.

It was really hard for me. " She said the problem with asthma is that you don't know when it will happen.

She was fine when she arrived at the stadium. The breathing treatment helped her. Joyner-Kersee's experience

shows that medical treatment is important. First, if you think you have asthma, see a doctor. Asthma drugs

can protect your lungs. Second, pay attention to your health. Tell your doctor immediately if you wake up and

have trouble breathing. This means the condition is getting worse. Many people don't want to be known to

have asthma, and then they must go to the hospital.

     Most importantly, remember that with asthma, you can have a normal life. You can even win an Olympic

gold medal.

1. Did Jackie Joyner-Kersee run at the 1994 U. S. Olympic Festival? 

   _________________________________________________________________

2. What is asthma? 

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3. When did Joyner-Kersee first find she had asthma?

   _________________________________________________________________

4. How can you tell your asthma is getting worse?

   __________________________________________________________________

5. What do you think is the writer's purpose of writing the passage? 

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问答题 案例分析题