问题
填空题
鼠标器、打印机和扫描仪等设备都有一个重要的性能指标，即分辨率，它用每英寸的像素数目来描述，通常用三个英文字母 【 】 来表示。
答案
参考答案：DPI或dpi
解析：鼠标器最主要的技术指标是分辨率dpi(dot per inch)，它是指鼠标每移动一英寸能够检测出的点数；打印机的性能指标主要是分辨率dpi(每英寸可打印的点数)。
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鼠标器、打印机和扫描仪等设备都有一个重要的性能指标，即分辨率，它用每英寸的像素数目来描述，通常用三个英文字母 【 】 来表示。
参考答案：DPI或dpi
解析：鼠标器最主要的技术指标是分辨率dpi(dot per inch)，它是指鼠标每移动一英寸能够检测出的点数；打印机的性能指标主要是分辨率dpi(每英寸可打印的点数)。
Thousands of years ago, people didn’t live in cold places because they didn’t know how to keep themselves warm. Later they learned to make clothes. When an animal was killed, they made use of its skins to cover their bodies. ______ 小题1:____.Nature is people’s good friend. It once helped people find fire, when lighting hit a forest and started a fire. _____ 小题2:___. The fire kept them warm, and also frightened wild animals. Soon people found the food cooked tasted much better, so they began to use the fire to cook food.___ 小题3:____ . When they got a fire from the forest, they tried to keep it burning. If it went out, they had to wait for ye小题4:ars._____ 小题5:___. For example, they made fire by boring wood or knocking two pieces of stones.Today it’s easy for people to make fire because they have matches, lighters and different kinds of heaters. ____ 小题6:______
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