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 with you. This invention  may be able to help you. It is a device (装置）which uses satellites (卫星）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 of 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 (计算)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 (精确的). 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.

根据材料内容选择最佳答案。

(   ) 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 of 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(推断）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.

Answer 1

 1.A推理判断题。根据第一段、第二段和最后一段各段最后一句内容可知，借助GPS，人们不会在新的城市里迷路。故选A.本题难度中等。

2. A细节理解题。根据第三段第一句：句There are three parts of the Global Positioning System.可知，GPS由三部分组成。故选A.本题难度较小。

3.D词义猜测题。根据画线词前句The third part of the system is a network of ground stations.可以推断出，they指的是地面站。地面站能够 控制卫星并且确保它们正常运行。故选D.本题难度中等。

4.B主旨大意题。本文主要是对GPS的构成和具体功能进行了介绍。故选B. 

5.D推理如断题。根据最后一段内容可以推断出 OPS的使用在我们的日常生活中会变得越来越普遍。故选D.本题难度中等。