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问题 单项选择题

管理信息系统是各职能子系统的一个联合体。每个子系统可有自己的专用程序，也可调用服务于各职能部门的公用的分析和决策模型，这些模型构成了信息系统的模型库。上述关于管理信息系统的描述说明了它的

A．物理结构

B．概念结构

C．横向综合结构

D．纵向综合结构

答案

参考答案：B

解析： 管理信息系统是各职能子系统的一个联合体。每个子系统包含战略计划、管理控制及执行控制等3个信息处理部分。每个子系统都有自己的专用数据文件，同时还可共用由DBMS管理的公用数据库，各职能子系统通过接口文件实现相互间的联系。这反映了管理信息系统的概念结构。

选择题

吃西瓜时，红色瓜瓤部分实际是 [ ]

A．一种结缔组织

B．一种营养组织

C．一个器官

D．一种输导组织

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单项选择题

Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective effects, " Kinsley said.
"It’s rat data but humans are mammals just like these animals are mammals, " he added in a telephone interview. "They go through pregnancy and hormonal changes. "
Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.
"When people think about pregnancy, they think about what happens to babies and the mother from the neck down, " said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.
"They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations to the brain. \

"It’s rat data but humans are mammals just like these animals are mammals. "
What does the sentence suggest

A. The experiments on the rats have nothing to do with humans.
B. The experiments on the rats are very important for animals.
C. The experiments on the rats are much the same on humans.
D. The experiments on the rats are much the same on other animals.
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