3. Read the text again and answer these questions.

1. According to the writer, what is the importance of 'pixel resolution'?

2. Which unit of frequency is used to measure the refresh rate of a monitor?

3. In the writer's opinion, why can a low refresh rate produce eye fatigue?

4. What substance is hit by electrons in a monitor?

5. What is the standard display system for many PCs?

6. What does LCD' stand for? What type of computers use LCD displays?

II. Writing

1. Tables often include abbreviations and technical words that are not easy to understand. Look at this table and the explanation of Monitor a's specifications.

	Type	Size	Pixel res.	Visual display	Refresh rate	Tilt-and- swivel	Other features
Monitor A Compaq TFT 8020	Flat-panel LCD	18.1"	1024 x 768	16.7 million colours	75 Hz flicker-free	√	energy saver mode
Monitor B Paintview	CRT monitor	19"	1280 x 1024	16.7 million colours	85 Hz flicker-free	√	anti-glare filter

2. The specifications of Monitor a can be described like this:

1. This is a flat-panel Liquid Crystal Display.

2. The screen size is 18.1 inches (diagonal viewable image size).

3. You get a resolution of 1024 by 768 pixels.

4. It offers support for 16.7 million saturated colours.

5. This digital display has a 75 hertz refresh rate. It never flickers (the images are bright, sharp, and distortion-free).

6. You can change the orientation of the display, adjusting your viewing angle back and forth.

7. It has a built-in power feature that saves a lot of energy consumption.

3. Use the example above to help you describe Monitor b.

III. Listening

Tony Clark, a lecturer in computer ergonomics, is talking to some students about health and safety in a computer classroom. Listen and complete the sentences below. Then decide where they should go in the pictures.

1. You should get a good chair, one that ……………………..

2. Position the keyboard

3. Position the monitor eye level, or just

4. A tilt-and-swivel display lets you

5. You should stay an arm's length away from

6. If you work in a room with a lot of computers, sit

IV. Grammar: Giving Instruction and advice.

1. Read and study the information below:

Imperatives

Position your keyboard at the same height as your elbows.

Don't use a monitor that is fuzzy or distorts the image.

Should/ought to

You should position your keyboard at the same height as your elbows. = You ought to ...

You shouldn't use a monitor that is fuzzy or distorts the image. - You ought not (oughtn't)to use ...

2. Using the examples above rewrite the following instructions, so that you get a piece of advice about how to protect your eyes while working with computer.

1. Do not stare at the screen for long periods of time.

2. Avoid placing the monitor so that it reflects a source of bright light, such as a window.

3. Keep the screen clean to prevent distorting shadows.

4. If you work in an office with a large number of computers, don't sit too close to the sides or backs of the monitors.

5. Buy a protective filter that cuts down the ELF (extremely low frequency) emissions.