问题 单项选择题

在对数据流图的分析中,主要是找到中心变换,这是从数据流图导出哪项的关键

A.实体关系

B.程序模块

C.程序流程图

D.结构图

答案

参考答案:D

解析: 在需求分析阶段建立数据流图,用以表达问题中数据流和加工之间的关系;概要设计阶段则需要建立程序结构图,用以表示程序的总体结构。对于变换型问题的数据流图,中心变换送出的数据流称为逻辑输出,在中心变换两端的数据流就是逻辑输入和逻辑输出。对数据流图的分析主要是找到中心变换,这是从数据流图导出结构图的关键。

单项选择题
阅读理解

阅读理解。

     A mouse looked through a hole in the wall to see the farmer and his wife opening a package; what food

could it contain? He was astonished to discover that it was a mouse trap!

     Running to the farmyard, the mouse shouted, warning everyone, "There is a mouse trap in the house,

there is a mouse trap in the house." The chicken, with her head high, glared at the mouse and said, "Shut up.

Little Ugly. This is a great concern to you, but it has nothing to do with me:I can't be troubled by it."

     The mouse turned to the pig and told him."There is a mouse trap in the house." "I am so sorry, Mr

Mouse," said the pig sympathetically, "but there is nothing I can do about it but pray;you are always in my

prayers."

     The mouse turned to the cow, who said,"A mouse trap, am I in great danger, huh?"

     Now the mouse had to face the farmer's mouse trap alone.

     That very night a sound was heard through the house, like that of a mouse trap catching its prey. The

farmer' wife rushed to see what was caught. In the darkness, she did not see it was a big poisonous snake

whose tail the trap had caught. The snake bit the farmer's wife. The farmer rushed her to the hospital. She

rerturned home with a fever. It is said that drinking fresh chicken soup will help treat fever, so the farmer took

his sharp knife to the farmyard for the soup's main ingredient. His wife's sickness continued, so friends and

neighbors came to sit with her around the clock. To feed them, the farmer killed the pig. The farmer's wife did

not get well, in fact, she died, and so many people came for her funeral. The farmer had the cow killed to

provide for all of them to eat.

     So next time when someone is facing a problem, don't say that it has nothing to do with you.

1. We could see from the passage that the mouse was _____.

A. good at cheating others

B. dishonest

C. kind and warm-hearted

D. foolish

2. Which of the following is NOT TRUE according to the passage?

A. The others help the farmer kill the cow.

B. The mouse trap was very practical.

C. The pig is more friendly than the other animals.

D. The farmer's family had no friends at all.

3. The passage is most probably a _____.

A. fable (寓言)

B. science fiction

C. fairy tale (神话)

D. humorous story

4. What can we learn from the story?

A. Traps can always cause chain reactions.

B. It is better to be safe than to be sorry.

C. Sometimes when the least of us is threatened, we all might be at risk.

D. To keep the balance of nature is the duty of us al.