问题 单项选择题

在下面所述中,关于UML的说法不正确的是()①UML不适用于迭代式的开发过程②UML是一种可视化的建模语言③不是过程也不是方法,但允许每一种过程和方法使用它④UML描述系统的静态结构与动态行为

A.①

B.②

C.③

D.④

答案

参考答案:A

解析:UML是一个通用的可视化建模语言,它是面向对象分析和设计的一种标准化表示,UML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并没有定义一种标准的开发过程,但它比较适用于迭代式的开发过程。UML不是一种可视化的程序设计语言,而是一种可视化的建模语言。UML不是过程也不是方法,但允许每一种过程和方法使用它。UML描述了系统的静态结构和动态行为,它将系统描述为一些独立的相互作用的对象,构成为外界提供一定功能的模型结构,静态结构定义了系统中重要对象的属性和服务,以及这些对象之间的相互关系,动态行为定义了对象的时间特性和对象为完成目标而相互进行通信的机制

阅读理解

阅读理解。

   Washington(Reuters)-People who drink two or more sweetened soft drinks a week have a much higher

risk of pancreatic cancer(胰腺癌),an unusual but deadly cancer,researchers reported on Monday.

   People who drank mostly fruit juice instead of  sodas did not have the same risk, the study of  60,000

people in Singapore found.

   Sugar may be to blame but people who drink sweetened sodas regularly often have other poor health

habits,said Mark Pereira of the University of Minnesota,who led the study.

   "The high levels of sugar in soft drinks may be increasing the level of insulin(胰岛素)in the body,which

we think contributes to pancreatic cancer cell's growth,"Pereira said in a statement.

   Writing in the journal Cancer Epidemiology,Biomarkers & Prevention,Pereira and his colleagues said

they followed 60,524 men and women in the Singapore Chinese Health Study for 14 years.

   Over that time,140 of the volunteers developed  pancreatic cancer. Those who drank two or more

sweetened soft drinks a week had an 87 percent higher risk of being among those who got pancreatic

cancer.

   Pereira said he believed the findings would apply elsewhere.

   "Singapore is a wealthy country with excellent healthcare . Favorite pastimes (消遣) are eating and

shopping,so the findings should apply to other Western countries,"he said.

   But Susan Mayne of the Yale Cancer Center at Yale University in Connecticut was cautious.

   "Although this study found a risk,the finding was based on a relatively small number of cases and it

remains unclear whether it is a causal(因果的)connection or not,"said Mayne,who serves on the board

of the journal,which is published by the American Association for Cancer Research.

   Pancreatic cancer is one of the deadliest forms of cancer, with 230,000 cases globally. In the United

States,37,680 people are diagnosed with pancreatic cancer in a year and 34,290 die of it.

1.According to the text,who is in control of the health study?

A.Mark Pereira.

B.Scientists from Singapore.

C.Researchers in Yale.

D.Susan Mayne.

2.We can infer from Pereira's words that __________.

A.the healthcare in Singapore should be greatly improved

B.2 soft drinks a day are considered harmful to health

C.87 out of 140 volunteers developed pancreatic cancer

D.sugar might not be the only cause of pancreatic cancer

3.How does Susan seem to feel about the findings of the study?

A.Satisfied.  

B.Doubtful.

C.Worried. 

D.Hopeful.

4.The best title of the text might be __________.

A.The Deadliest Forms of Cancer

B.Drink Fruit Juice Instead of Sodas

C.A Study in University of Minnesota

D.Sugary Soft Drinks Lead to Cancer

单项选择题