计算机的指挥中心是( )。
A．控制器
B．运算器
C．存储器
D．输入/输出设备
参考答案：A
解析： 控制器是由指令计数器、指令寄存器、译码器、操作控制器等部分组成，是计算机的控制指挥中心，协调和指挥整个计算机系统的操作。运算器由算术逻辑部件、数据寄存器、累加器等部分组成，主要负责对信息的加工和运算，是控制器的执行部件，接受控制器的指示，按照算术运算规则进行加、减、乘、除、开方等算术运算和与、或、非等逻辑运算。存储器是计算机系统中具有记忆能力的部件，用来存放程序和数据。
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| In this modern world, we rush around all day, doing things, talking, sending and reading messages. We are always on, always connected, always thinking, always talking. There is no 1 for stillness. And when we are 2 to be still because we're in line for something, or waiting at a doctor's appointment, or on a bus or train, we often 3 something to do. Some will play with mobile devices, others will read something. Being still isn't something we're 4 . This comes at a 5 : we lose that time for 6 , for observing and listening. We lose peace. And 7 still: sometimes too much action is worse than no action at all. You can run around crazily, but get 8 done. Take a moment to think about 9 you spend your days. Are you constantly rushing around? Are you constantly reading and answering 10 or checking on the news and the latest stream of information? Are you always 11 through your schedule? Is this how you want to spend your 12 ? If so, peace be with you. If not, take a moment to be 13 . Don't think about what you have to do, or what you've done already. 14 be in the moment. Then after a minute or two of doing that, consider your life, and how you'd 15 it to be. See your life with less movement, less doing, less rushing. See it with more stillness, more consideration, more 16 . Then be that vision. It's pretty simple: all you have to do is sit still for a little bit each day. 17 you've gotten used to that, try doing less each day. Breathe when you feel yourself moving too 18 . Slow down. Find happiness now, in this moment, instead of 19 for it. 20 the stillness. It's a treasure, and it's available to us, always. | ||||
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