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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(裝置) which uses satellites (衛(wèi)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.
There are three parts to the Global Positioning System. The first part is the receiver. You can hold it in your hand, or have it fixed into your car, plane, etc. The second part is a group of satellites orbiting the Earth. The receiver contacts at least four of the satellites and calculates(計算) its position. The third part of the system is a network of ground stations. They are all over the world. They control the satellites and make sure they are working well.
Some people think that in the future the GPS will be as common as the mobile. They are becoming cheaper and more and more accurate(精確的). There are also new uses for the GPS. Perhaps they will become like watches. Everyone will have one and you will never be lost again.
小題1:According to the passage, with the help of the GPS, people __________.

A．can’t be lost in a new city

B．can’t find their way in different countries

C．can learn about the culture of an unknown place

D．can spend the least time getting to another place

小題2:We can learn from the passage that ____________.

A．there are three parts to the GPS

B．a(chǎn) GPS can’t be put into a watch

C．a(chǎn) GPS can help you start your car

D．the GPS are becoming more and more expensive

小題3:The underlined word “They” in paragraph 3 means “____________”.

A．Receivers

B．GPS devices

C．Satellites

D．Ground stations

小題4:The passage is mainly about _______________.

A．the history of the GPS	B．the introduction of the GPS
C．the shape of the GPS	D．the three parts of the GPS

小題5:What can we infer(推斷) from the passage?

A．All GPS devices have electronic maps.

B．People in many countries will use the GPS for free.

C．The receiver of the GPS contacts at least five of the satellites.

D．The GPS will become more and more common in everyday life.

小題1:A
小題2:A
小題3:D
小題4:B
小題5:D

短文大意：這篇短文主要介紹了衛(wèi)星定位系統(tǒng)的工程及工作原理。
小題1:根據(jù)短文第一段It can find your position to within 20 metres. A GPS cannot start your car, but at least you will know where you are.描述，可知衛(wèi)星定位系統(tǒng)能讓你知道自己在哪兒。故選A，不會在新城市中迷路。
小題2:根據(jù)第三段There are three parts to the Global Positioning System.描述，可知衛(wèi)星定位系統(tǒng)有三個部分。故選A。
小題3:聯(lián)系下文The third part of the system is a network of ground stations.描述，可知指的是地面接收站。故選D。
小題4:這篇短文主要介紹了衛(wèi)星定位系統(tǒng)的工程及工作原理。故選B，介紹衛(wèi)星定位系統(tǒng)。
小題5:根據(jù)短文最后一段描述，可知衛(wèi)星定位系統(tǒng)在日常生活中會變得越來越普通。故選D。

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