Прочитайте текст. In computers the keyboard is an arrangement of buttons that each corresponds to a ...: ответ на тест 1104784 - Английский язык

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In computers, the keyboard is an arrangement of buttons that each corresponds to a function, a letter or a number. They are the primary devices of inputting text. In most cases, the keyboards contain an array of keys specifically organized with the corresponding letters, numbers, and functions printed or engraved on the button. They are generally designed around an operator’s language, and many different versions for different languages exist. In English, the most common layout is the QWERTY layout, which was originally used in typewriters.
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What is the keyboard?

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There is no standard computer keyboard, although many manufacturers imitate the keyboards of PCs. There are actually three different PC keyboards: the original PC keyboard, with 84 keys; the AT keyboard, also with 84 keys; and the enhanced keyboard, with 101 keys. The three differ somewhat in the placement of function keys, the Control key, the Return key, and the Shift keys.
In addition to these keys, IBM keyboards contain the following keys: Page Up, Page Down, Home, End, Insert, Pause, Num Lock, Scroll Lock, Break, Caps Lock, Print Screen.
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How many keys has enhanced keyboard?

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A mouse is a small, slidable device that users hold and slide around to point at, click, and sometimes drag objects on the screen in a graphical user interface using a pointer on the screen. Almost all personal computers have a mouse. A mouse can be plugged into a computer rear mouse socket, or as USB (device), or, more recently, may be connected wirelessly via USB antenna or Bluetooth antenna.
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What is a mouse used for?

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Prior to the wide spread of PCs the computer that could fit on a desk was considered remarkably small. Today the phrase usually indicates a particular style of the computer case. Desktop computers come in a variety of styles ranging from large vertical tower cases to small form factor models that can be tucked behind LCD monitor. In this sense, the term “desktop” refers specifically to a horizontally-oriented case, usually intended to have the display screen placed on top to save space on the desk top. Most modern desktop computers have separate screens and keyboards.

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A laptop computer or simply laptop, also called a notebook computer or sometimes a notebook, is a small personal computer designed for mobility. Usually all of the interface hardware needed to operate the laptop, such as parallel and serial ports, graphic card, sound channel, etc., are built in to a single unit. Most laptops contain batteries to facilitate operations without a readily available electrical outlet. In the interest of saving power, weight and space, they usually share RAM with the video channel, slowing their performance compared to an equivalent desktop machine.

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Netbook PCs are small portable computers in a “clamshell” design, that are designed specifically for wireless communication and access to the Internet. They are generally much lighter and cheaper than subnotebooks, and have a smaller display, between 7" and 9", with a screen resolution between 800x600 and 1024x768. The operating systems and applications on them are usually specially modified so they can be comfortably used with a smaller sized screen, and the OS is often based on Linux, although some netbooks run on Windows XP.