将数据和程序都装载和运行于主计算机上，通过网络系统应用于广域_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

将数据和程序都装载和运行于主计算机上，通过网络系统应用于广域地区的的系统结构属于

A．C／S结构

B．B／S结构

C．多层结构

D．集中式结构

答案

参考答案：D

解析：集中式结构早期形成于20世纪60年代.它采用集中式分时处理模式。所有数据和程序都装载和运行在宿主计算机上，一般都是大型和中型计算机系统，除硬件本身外，还要包括操作系统、数据管理软件和应用软件以及其他的辅助软件。

单项选择题

库欣综合征的发病是由于（）

A．胰岛素绝对不足

B．胰岛素相对不足以及靶细胞对胰岛素敏感性降低

C．突然大量甲状腺素释放人血

D．甲状腺素分泌及合成不足或周围组织对甲状腺激素缺乏反应

E．皮质醇分泌增多

完形填空

阅读下面短文，从短文后各题所给的四个选项（Ａ、Ｂ、Ｃ、Ｄ）中，选出可以填入空白处的最佳选项
I want to share a true story with you. I am    1   that it can inspire (激励) everyone. Let’s be like lamps (灯) or candles to light people’s    2  .
Some of my    3   work in Australia. Among the natives, there was an elderly man. I am sure that you have    4  been in a situation as difficult as that    5   old man’s. He was completely ignored by everyone. His    6   was disordered and dirty.
I told him, “Please let me    7   your house, wash your clothes, and make your bed.” He answered, “I’m    8   with this. Let it be.”
I said again, “It will be still better if you    9   me to do it.”
He finally    10  . So I was able to clean his house and wash his clothes. I    11   a beautiful lamp, which was covered with    12  . Only God knows how many    13   had passed since he last lit it.
I said to him, “Don’t you light your lamp? Don’t you ever    14   it?”
He answered, “No. No one comes to see me. I have no    15   to light it. Who would I light it for?”
I asked, “Would you light it every    16   my sisters came?”
He replied, “Of course.”
From that day on, my sisters committed (投入) themselves to    17   him every evening. We cleaned the lamp and he would    18   it every evening.
Two years passed. I had completely    19   that man. He sent this message: “Tell my friends that the light they lit in my life continues to    20   still.”