【題目】根據(jù)材料內(nèi)容，選擇正確答案。

Imagine the situation. You are driving alone in 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. Yon have no mobile phone. What do you do? Well, next time take a GPS with you. This invention may be able to help vou. 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.
（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
（2）We can learn from the passage that .
A.there are three parts to the GPS
B.a GPS can't be put into a watch
C.a GPS can help you start your car
D.the GPS are becoming more and more expensive
（3）The underlined word "They" in Paragraph 3 means "".
A.Receivers
B.GPS devices
C.Satellites
D.Ground stations
（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
（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.

【答案】
（1）A
（2）A
（3）D
（4）B
（5）D
【解析】這是一篇關(guān)于GPS的說明文。
（1）A 根據(jù)第一段、第二段和最后一段各段最后一句內(nèi)容可知，借助GPS，人們不會在新的城市里迷路。故選A。
（2）A 根據(jù)第三段第一句“There are three parts to the Global Positioning System. ”可知GPS由三部分組成。故選A。
（3）D 根據(jù)畫線詞前句“The third part of the system is a net-work of ground stations. ”可以推斷出，they指的是地面站。地面站能夠控制衛(wèi)星并且確保它們正常運行。故選D。
（4）B 本文主要是對GPS的構(gòu)成和具體功能進行了介紹。故選B。
（5） D 根據(jù)最后一段內(nèi)容可以推斷 出GPS的使用在我們?nèi)粘Ｉ钪袝兊迷絹碓狡胀�。故選D。

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