15. In pairs, choose one of these input devices and describe its functions and features. Try to guess which device your partner is describing.

Bar code reader	Touchpad on a portable PC	Webcam	Touch screen

Vocabulary Practice

16. Revise the meaning of new words. Give Russian equivalents for the expressions with them. Use them in your own sentences.

Environment: execution environment; external environment; hardware environment; interface environment; management environment; multimedia environment; network environment; processing environment; security environment; software environment; user environment.

Interface: channel interface; common interface; data interface; database interface; display interface; external interface; flexible interface; floppy-disk interface; general-purpose interface; hardware interface; low-level interface.

Scanner: bar code scanner; black-and-white scanner; color scanner; desktop scanner; hand scanner; laser scanner; manual scanner; optical scanner; visual scanner.

Terminal: batch terminal; desktop terminal; display terminal; printer terminal; remote terminal; security terminal; logical terminal; text terminal.

Mouse Actions

17. Complete this text about the mouse with verbs from the box.

click double click drag grab select move control

A mouse allows you to (1) _____________ the cursor and move around the screen very quickly. Making the same movements with the arrow keys on the keyboard would take much longer. As you (2) ______________ the mouse on your desk, the pointer on the screen moves in the same direction. The pointer usually looks like an I-bar, an arrow, or a pointing hand, depending on what you are doing.

A mouse has one or more buttons to communicate with the computer. For example, if you warn to place the insertion point or choose a menu option, you just (3) ____________ (press and release) on the mouse button, and the option is chosen.

The mouse is also used to (4) _______________ text and items on the screen. You can highlight text to be deleted, copied or edited in some way.

The mouse is widely used in graphics and design. When you want to move an image, you position the pointer on the object you want to move, press the mouse button, and (5) ________________ the image to a new location on the screen. Similarly, the mouse is used to change the shape of a graphic object. For example, if you want to convert a square into a rectangle, you (6) ______________ one corner of the square and stretch it into a rectangle.

The mouse is also used to start a program or open a document: you put the pointer on the file name and (7) _______________ on the name – that is, you rapidly press and release the mouse button twice.

18. Revise Infinitive forms. Explain the use of Infinitive and translate sentences into Russian:

Infinitive	Active	Passive
Indefinite	to ask	to be asked
Continuous	to be asking	___________________
Perfect	to have asked	to have been asked
Perfect-Continuous	to have been asking	___________________

1. A printer is an example of a device to produce output in a human-readable format. 2. The high-speed devices to be used as secondary storage are both input and output devices. 3. The progress of electronics to have resulted in the invention of electronic computers was a breakthrough (прорыв) of the second part of the 20lh century. 4. Mendeleyev’s periodic law to have been accepted as a universal law of nature is of great importance nowadays. 5. When output is available, output interfaces must be designed to reverse the process and to adopt the output to the external environment. 6. The memory stores the instructions and the data to be quickly retrieved on demand by the CPU. 7. Computers to have been designed originally for arithmetic purposes are applicable for great variety of tasks at present. 8. The film to have been running for over a month this year attracts attention of many spectators. 9. The CPU of a computer to be arranged in a single or very small number of integrated circuits is called a microprocessor. 10. Russia was the first country to start the cosmic era.

Active Vocabulary

keyboard – key- manipulator- trackball- touch panel / pad - graphic plotting tables - sound card- enable- operating mode - press a button- keep buttons depressed- double-click- erase image- roller - track- by means of - permitting capacity -

клавиатура клавиша; кнопка; переключатель; ключевой; основной; главный; набирать на клавиатуре манипулятор; блок обработки шаровой указатель; трекбол сенсорная панель графические планшеты звуковая карта (плата) разрешать; позволять; допускать; делать возможным режим работы нажать на кнопку удерживать кнопки в нажатом состоянии двойное нажатие удалить, стереть изображение (объект) ролик; валик следить; прослеживать; проходить; след; траектория; путь; дорожка; соединение посредством разрешающая способность

19. Read the text. Point out its main ideas.