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Exercise 3. Match each device with its use.

1. joystick

2. lightpen

3. scanner

4. digital camera

5. mouse

6. keyboard

7. microphone

a) draw pictures on to a computer screen

b) copy documents

c) input sound

d) input text

e) select from a menu

f) move the cursor rapidly

g) produce photos without film

Exercise 4. Decide which input device is best for:

1. controlling fast-moving objects in a game

2. reading the price of things in a shop

3. making copies of a page of text and graphics

4. storing sounds on a computer

5. producing pictures of people and places for storing in a computer

6. controlling a computer using speech

7. typing text into a computer

Exercise 5. Read the text and identify each device: trackerball/ joystick/ lightpen/ scanner.

The part of the computer that takes in information is called the input unit. The input unit or device provides the means of communication between the computer and the people who are interested in its operation. The input device makes possible communication from the other data-handling equipment and a man to computer. It is a functional part of the computer that accepts the data to be operated on and programs for operating.

A ______ is another input device you can connect to a computer system. The _______ is able to move in eight directions. ________s are mostly used in computer games to control the way a picture on the screen moves. Sometimes two ______s are connected to a computer, so two people can play the game at the same time.

A ______ works in exactly the same way as a mouse, except that the ball is on top. The user rolls the ball around with her hand to operate it. If you use a ______, you don’t need extra space on your desk to move it around (like you do it with a mouse). ________s are often used on small portable computers and on some video game machines.

A _____ can be used to draw pictures directly on to a computer screen or read the pattern on a barcode. A ________ that can read barcodes detects the difference between the light reflected from a black barcode line and its lighter background.

Using a _____, you can input printed drawings, photographs, or text directly into a computer. A _______ works like a photocopier – a light is shone on the material and the _______ detects the reflected light. You can use a ______ with optical character recognition (OCR) software to input the scanned text into a word processing package.

Exercise 6. Match grammatical construction with its definition.

Exercise 7. Write out from the text all the verbs in Present. Define what form of Present is it?