( )27. A. car B. life C. job D. grade

( )28. A. wise B. silly C. friendly D. unhappy

( )29. A. pain B. appearance C. anger D. mind

( )30. A. much B. many C. little D. all

C

Imagine the situation. You are driving along a desert or on a mountain. You have no idea

where you are. You passed the last house two hours ago. Then your car breaks down. It is night

and it is cold. You have no mobile phone. What do you do? Well, next time take a GPS with you.

This invention may be able to help you. It is a device(装置) which uses satellites (卫星) to find

the user‟s position(位置). It can find your position to within 20 metres. A GPS cannot start your

car, but at least you will know where you are.

GPS, which means Global Positioning System, is a small radio receiver. It looks like a mobile phone. You can

hold it in your hand, or put in your pocket. It is sometimes put into a watch or a telephone. We also find GPS devices in cars, planes, or boats. Some of these devices have electronic maps, so you know where you are. For example, in a city they can tell you the name of the street.

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