Compare your answers with other students.

Text Device

1 ________________________________________________________

2 ________________________________________________________

3 ________________________________________________________

4 ________________________________________________________

1) 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.

2) 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 any extra space on your desk to move it around (like you

do with a mouse). ______ s are often used on small portable computers and on

some video game machines.

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3) A ______ can be used to draw pictures directly on to a computer screen or to 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.

4) 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.

Language work: Present Simple

Study these statements about keys.

1. This key moves the cursor down.

2. This key copies the screen display.

3. This key doesn’t have a fixed function.

The verbs in italics are in the Present Simple. We use the Present Simple to

describe things which are always true.

Дата добавления: 2015-11-13