【单选题】【消耗次数：1】
个人计算机（PC）必备的外部设备是__________。
①
键盘和鼠标
②
显示器和键盘
③
键盘和打印机
④
显示器和扫描仪
参考答案：
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【单选题】
同为计算机的输出设备，打印机和显示器的不同点是（ ）。
①
打印机的价格远较显示器为高
②
打印机的打印分辨率大大高于显示器
③
打印机输出速度大大快于显示器
④
打印机将输出内容印刷到纸上，显示器将输出内容显示在屏幕上
【单选题】
计算机显示器所用的三原色指的是_______
①
RGB( 红色、绿色、蓝色)
②
CMY（青色、洋红、黄色）
③
CMYK(青色、洋红、黄色、黑)
④
HSB(色泽、饱和度、亮度)
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<img src="https://huaweicloudobs.ahjxjy.cn/5D2E5A5B9035D3651746C5C8EA34B414.png" title="7.png" alt="7.png"/><img src="https://huaweicloudobs.ahjxjy.cn/7EC75D2ED1CD1F484C52CE2DF25DCDE4.png" title="1.png" alt="1.png"/>[填空1]
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Translate the following sentence into ChineseGovernments of many countries have established laws to protect the air, forests and sea resources.
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Translate the following sentence into ChineseAt the meeting, they discussed how to keep the lines of communication open between teachers and students.
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