1. 阅读理解

Do you often feel tired? Do you sometimes feel uncomfortable on your neck and back? It may because of the radiation (辐射) from your computer. If you spend three hours or more in front of a computer, you may feel terrible because of the radiation.

The safe amount of radiation is 25V/m. Do you know how much radiation our computers give off?

Keyboard: 1,000 V/m      Mouse: 450 V/m

Monitor: 218V/m          CPU: 170 V/m

Laptops: 2,500 V/m

Ways to protect yourself from harmful computer radiation:

1 Put some green plants on your desk. They can take in radiation.

2 Drink two to three cups of green tea a day and eat an orange daily. They keep us healthy.

3 Use a screen filter (屏幕过滤器) for your monitor.

4 Avoid having metal (金属的) objects near your desk.

5 Put the back of the computer to the wall. Most of the radiation comes from the back.

6 Keep your monitor at least 50 cm away from your face.

7 Allow fresh air to move around your computer room.

8 Eat healthily — especially fruit and vegetables.

9 Turn off your computer if you have to rest nearby.

1. （1） Which of the following is the most dangerous?

   A . Eating some junk food. B . Being busy only on the computer. C . Taking less exercise in a day. D . Sleeping too much in a day.
3. （2） What's the first paragraph about?

   A . To tell the danger of radiation. B . To tell us what radiation is. C . To tell why there is radiation. D . To tell the importance of radiation.
5. （3） Which part of a computer has the most radiation?

   A . The monitor. B . The mouse. C . The keyboard. D . The CPU.
7. （4） How many pieces of advice are about eating?

   A . One. B . Two. C . Three. D . Four.
9. （5） What's the purpose (目的) of this passage?

   A . To tell us which kind of computer we should buy. B . To show us how dangerous computers are. C . To encourage us to use the laptops more often. D . To tell us to get away from computer radiation.