下列关于计算机系统硬件的说法中，正确的是______。
A) 键盘是计算机输入数据的惟一手段
B) 显示器和打印机都是输出设备
C) 计算机硬件由中央处理器和存储器组成
D) 内存可以长期保存信息
参考答案：B
解析： 计算机硬件系统组成及其功能
[评析] 计算机的硬件主要包括：中央处理器(包括运算器和控制器)、存储器、输出设备和输入设备。键盘和鼠标器属于输入设备，显示器和打印机属于输出设备。
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| Once upon a time there lived an old man in a nice cottage with a large garden. The old man was seen 1 his flowers all the time. They were so well-tended that every passer-by could not but 2 for a glance. One day a young man went by the garden. He gazed at the splendid garden, 3 in admiration at the beauty of these sceneries. Then, suddenly he 4 the old gardener was blind. 5 , the young man asked, "Why are you busy tending these flowers every day which you can't 6 in fact?" The old man smiled and answered that "I can tell you 7 reasons. First I was a 8 when I was young, and I really like this job. Second, although I can't see these flowers, yet I can 9 them. Third, I can smell sweetness of them. As to the last one, that's 10 ." "Me? But you don't know me," responded the young man 11 . "Yeah, it's 12 that I don't know you. But I know everyone knows flowers and would never 13 them down. I know the beauty of my garden will get many people into a good 14 . In the meantime, it also 15 a chance to me to have a word with you here and to enjoy the happiness these flowers have brought us." The old man's 16 astonished me. The blind man grows flowers and 17 them as a link of minds so as to make 18 enjoy the sunshine in spring. Isn't it one kind of happiness? I believe every flower has 19 with which they can see the kindness of the man's heart. The blind man grows flowers in his heart. Though 20 to see the beauty of blossoming, he surely can hear the voice of it, I suppose. | ||||
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