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4.2 Describing input devices
A. Read three computer technicians describing three input devices. Write which device he’s talking about.
- Light pen
B . Look at the Help box below, read again and complete the following extracts
1. This device is ___used to____ enter information into the computer.
2. It may also__have____function keys and editing keys ___for____ special purposes.
3. This is a device _for controlling___the cursor and selecting items on the screen.
4. It usually _____features______two buttons and wheel.
5. The user__can___activate icons or select items and text.
6. It___works by___detecting light from the computer screen and it used by pointing it directly at the screen display.
7. It ___allows___the user___to______answer multiple-choice questions and…….
4.4 The keyboard
B.Match the descriptions (1-8) with the names of the key (a-h). Then find them on the keyboard
|1. A long key at the bottom of the keyboard. Each time it is pressed, it produces a blank space.
2 . It moves the cursor to the beginning of a new line. It is also used to confirm commands.
3. It works in combination with other keys. For example, you press this key and C to copy the select text.
4. It removes the character to the left of the cursor or any selected text.
5. It produces UPPER CASE character.
6 . It produces UPPER CASE letters, but it does not affect numbers and symbols.
7 . It moves the cursor horizontally to the right for a fixed number of spaces (in tabulations and data fields).
8. They are used to move the cursor, as an alternative to the mouse.
|a. arrow keys
c. Caps Lock
f. space bar
4.5. Mouse actions
A mouse allows you to (1)__control_____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)__move___the mouse on your desk, the pointer usually looks like and I-bar, an arrow, or a pointing hand, depending on what you are doing. A mouse has one or more buttons to communicate with computer. For example, if you want to place the insertion point or choose a menu option, you just (3)___click__(press and release) on the mouse button, and the option is chosen. The mouse is also used to (4)___select___ 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)__drag____ 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)__grab___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)___double-click__ on the name- that is, you rapidly press and release the mouse button twice.
Source: Infotech – English for computer users -Forth edition).
Computers are part of our everyday(1)…lives… They have an effect on almost everything you do. When you buy groceries at a supermarket, a(2)…computer……is used with laser and (3)……barcode…… technology to scan the price of each item and present a total. Barcoding items (clothes, food and books) require a computer to(4)… generate…….the barcode labels and maintain the inventory.
Most televisions advertisements and many films use (5)… graphics…….. produced by a computer. In hospitals, beside terminals connected to the hospitals(6)…main…… computers allow doctors to type in orders for blood(7)…tests…….. and to schedule operations(8)…Banks.. use computers to look after their customers’ money. In(9)…libraries…… and bookshops, computers can help you find the book you want as(10)…qickly…….as possible.
(Source: Infotech – English for computer users -Second edition).
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