Question

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. You have no mobile phone.”What do you do? Well, next time take a GPS receiver  with you. It may be able to help you. It is a device(装置)which uses satellites to find the user's position. It can find your position within 20 meters. A GPS receiver cannot start your car,but at least you will know where you are.

The GPS，which means the Global Positioning System, is a great invention. There are three parts to the GPS. The first part is the receiver. You can hold it in your hand，or have it fixed into your car,plane, etc. Some receivers have electronic maps, so you know where you are. For example, in a city they can tell you the name of the street. The second part to the GPS is a group of satellites orbiting (绕.. 运行)the earth. The receiver contacts at least four of the satellites and calculates(计算) its position. The third part to 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 Internet. It is becoming more and more accurate(精确的) and cheaper to use. Everyone will have a GPS receiver and you will never be lost again.

阅读短文，选择最佳选项。

(   ) 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.   the GPS is the same as the Internet

C.   the GPS can help you start your car

D.  the GPS is becoming more and more expensive to use

(   ) 3. The underlined word   " They”in Paragraph 3 refers to "__________

A.  Receivers

B.   Cars

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 receiver of the GPS

(   ) 5. What can we infer(推断）from the passage?

A.  All GPS receivers 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.

Answer 1

1. A通读全文可知在GPS的帮助下，人们在新的环境中不会迷路。故选A。

2. A  根据第二段第二句There are three parts to the GPS.可知它由三部分组成。故选A。

3. D根据第二段倒数第三句The third part to the system is a network of ground stations.可推知they指地面站。故选D。

4. B本文主要介绍GPS的组成和具体功能。故选B。

5. D根据最后一段可知GPS在我们日常生活中的应用将会越来越普遍。故选D。