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4. R         can help us in many ways.


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用方框内所给词的适当形式填空.

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 根据下面的对话情景,在每个空白处填上一个适当的句子,使对话的意思连贯、完整。

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A: There are so many great inventions in the history.

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 根据下面的对话情景,在每个空白处填上一个适当的句子,使对话的意思连贯、完整。

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   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.

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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

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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

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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

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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.

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 用方框内单词的适当形式填空。

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4. You can work out the problem easily when you use your        (imagine ) .

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