问题 单项选择题

下列关于UML的叙述中,正确的是()

A.UML是一种语言,语言的使用者不能对其扩展

B.UML仅是一组图形的集合

C.UML仅适用于系统的分析与设计阶段

D.UML是独立于软件开发过程的

答案

参考答案:D

解析:

UML是一个通用的可视化建模语言,用于对软件进行描述、可视化处理、构造和建立软件系统的文档。它记录了对必须构造的系统的决定和理解,可用于对系统的理解、设计、浏览、配置、维护和信息控制。

UML是独立于软件开发过程的,它适用于各种软件开发方法、软件生命周期的各个阶段、各种应用领域以及各种开发工具,UML,是一种总结了以往建模技术的经验并吸收当今优秀成果的标准建模方法。UML包括概念的语义、表示法和说明,提供了静态、动态、系统环境及组织结构的模型,它允许用户对其进行扩展。它可被交互的可视化建模工具所支持,这些工具提供了代码生成器和报表生成器。UML标准并没有定义一种标准的开发过程,但它适用于迭代式的开发过程。它是为支持大部分现存的面向对象开发过程而设计的。

UML不是一种可视化的编程语言,但是UML描述的模型可与各种编程语言直接相连,即可把用UML描述的模型映射成编程语言。

阅读理解

At 18, many American young people go off on their own. They go away to college or find full-time jobs, and they often pay for their own apartments. Some get married and start families. This independence(独立) is learned from childhood.

From an early age, American children learn to do things by themselves. Children as young as 2 begin to put away their toys and dress themselves. At 3, many children do simple chores like setting the table.

Using money in the right way is also taught early. As soon as a child understands the value of money, he or she receives a weekly allowance. This is used for things the child wants, like toys or treats. The child can spend or save it, usually with little help or advice from parents. If the child wants more money, it must be earned by doing extra chores.

Children are taught early in life to think for themselves. They are allowed to make some decisions

and make mistakes. Failure often teaches more than success.

小题1:. Many young American people begin to live on themselves ________ .

A.at the age of eighteen

B.from an early age

C.after they get married

D.when they find jobs小题2: An American child learns to ________ at the age of 2.

A. do a lot of chores  B. put on their own clothes     C. study for a test        D set the table

小题3: The underlined word “allowance” means ________ .

A.pocket money

B.present

C.prize

D.toy小题4: A child can get some more money by ________ .

A.understanding the value of money

B.doing a lot of homework

C.reading a lot of books

D.doing some more chores小题5: Which is NOT true according to the passage?

A.American children learn to be independent from an early age.

B.American children always use or save their money with the help of their mother.

C.American children are allowed to make some decisions and mistakes.

D.Failure is needed in children’s life as well as success.

单项选择题