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  3. Computers exist in a wide range of sizes and power. The smallest are embedded within the circuitry of appliances, such as televi

Computers exist in a wide range of sizes and power. The smallest are embedded within the circuitry of appliances, such as televi

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问题    Computers exist in a wide range of sizes and power. The smallest are embedded within the circuitry of appliances, such as televisions and wrist watches. These computers are typically preprogrammed for a specific task, such as tuning to a particular television frequency or keeping accurate time.
   Programmable computers vary enormously in their computational power, speed, memory, and physical size. The smallest of these computers can be held in one hand and are called personal digital assistants (PDAs). They are used as notepads, scheduling systems, and address books; if equipped with a cellular phone, they can connect to worldwide computer networks to exchange information regardless of location.
   Laptop computers and PCs are typically used in businesses and at home to communicate on computer networks, for word processing, to track finances, and to play games. They have large amounts of internal memory to store hundreds of programs and documents. They are equipped with a keyboard; a mouse, trackball, or other pointing device; and a video display monitor or liquid crystal display (LCD) to display information. Laptop computers usually have similar hardware and software as PCs. but they are more compact and have flat, lightweight LCDs instead of video display monitors.
   Workstations are similar to personal computers but have greater memory and more extensive mathematical abilities, and they are connected to other workstations or personal computers to exchange data. They are typically found in scientific, industrial, anti business environments that require high levels of computational abilities.
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答案Keeping accurate time
解析 根据文章最后—句话“These computers are typically preprogrammed for a specific task, such as tuning to a particular television frequency or keeping accurate time.”来做。其中的“keeping accurate time”便是指上一句的“wrist watches”的作用。
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