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.

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.


1.A     2.A     3.D    4.B    5.D


練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源： 題型：


        to school, they met their Chinese teacher.

A. On their ways        B. On them ways         C. On their way    D. On them way

查看答案和解析>>

科目：初中英語 來源： 題型：


閱讀理解，根據(jù)短文內(nèi)容，從短文后面每題所給的四個選項中選出最佳選項。

                                     

Mr. and Mrs. Brown have two children, Mike and Liz. The whole family are all busy, so they often leave notes（便條）for each other. Read these four notes of today and answer the following questions.

①     3:30 pm

To Mike，

Mr. Tyler rang. No football practice today. I’m going to Donna’s house to play and be back at 5:00 pm

Liz

②     4:00 pm

To Liz，

It’s your turn to walk the dog. I have to do my homework after school. Remember to play with Teddy when you get home!

Mike

③     6:45 pm

Has anyone seen my tennis shoes? I’m in my bedroom doing my homework.

Mike

④     9:00 pm

I saw your shoes this morning. They smelt terrible so I put them outside the back door. Good night, dears!

Mum

1. When will Liz be back home?

A. At 3:30 pm.     B. At 4:00 pm.     C. At 5:00 pm.      D. At 9:00 pm.

2. Who should walk the dog today?

   A. Mike.         B. Mrs. Brown.     C. Liz.             D. Mr. Brown.

3. What is Mike doing at 6:50 pm?

A. Practicing football.               B. Going to Donna’s house.

C. Playing tennis.                   D. Doing his homework.

4. Where can Mike find his tennis shoes?

A. In his bedroom.                   B. Outside the back door.  

C. In the living room.                 D. At Donna’s house.

5. According to the notes, Teddy is __________.            

   A. Mike’s mother                  B. Mike’s brother

   C. Mike’s football couch            D. the dog in the family

                           

查看答案和解析>>

科目：初中英語 來源： 題型：


---__________ weather it is! We can’t go boating on the Xuanwu Lake.

---Don’t worry. Let’s go to the Science Museum instead.

A. What good         B. How good          C. How bad          D. What bad

查看答案和解析>>

科目：初中英語 來源： 題型：


完形填空，閱讀下面短文，從短文后所給各題的四個選項（A、B、C和D）中，選出可以填入空白處的最佳選項

Scientists study the world and learn about things using a process called the scientific method(方法). By asking important questions and   1   the answers, it is possible to make amazing discoveries! Sometimes a scientist is   2   to answer his own questions, but if he has taken good notes another scientist may come along later who is able to use new knowledge to answer it.

When you use the scientific method to   3   an experiment, you start by making observations(觀察) about something that  4  you. Based on your observations, you make a hypothesis. This is using  5  you know to make a smart guess about what you think could happen. Then you are ready to begin your experiment. All   6  your experiment you take down notes, which are   7   experiment date(資料). You are constantly making observations during this time. You may make discoveries that cause you to improve your experiment as you go.   8  , you conclude your experiment and begin to look over your notes to decide what it all means. Based on what you have learned, you make a final statement about   9  your hypothesis was correct or not. You have to have reasons and evidence to support what you are saying.

Using the scientific method can be difficult, but rewarding. Because all the steps are organized in a process, the   10  are more valid(可信的). When you provide observations as evidence to support what you are saying, your ideas are more likely to be accepted.

1.   A. waiting for     B. searching for     C. worrying about     D. complaining about

2.   A. unable        B. sure             C. ready            D. surprised

3.   A. read         B. refuse            C. prevent           D. conduct

4.   A. hurts         B. represents        C. interests           D. attacks

5.   A. what         B. when            C. why              D. which

6.   A. without       B. including         C. except            D. during

7.   A. controlled     B. arranged         C. called             D. carried

8.   A. Obviously     B. Suddenly         C. Finally            D. Mostly

9.   A. whether       B. what             C. how              D. when

10.     A. problem     B. results           C. services            D. aims

查看答案和解析>>

科目：初中英語 來源： 題型：


根據(jù)短文內(nèi)容及首字母提示，填寫所缺單詞

Chuck Wall teaches management and human relations at Bakersfield College. He walked into class one day and told his students that their h    1    was to perform one act of random(任意的) kindness. His students did not understand the assignment(任務(wù)), but the professor would not answer their questions. He e    2    his students to find it out for themselves.

One week later, the students entered the classroom excited to s    3  their stories. One student told of distributing blankets to the homeless, another had contacted a long, lost friend, and another student r   4    that he had helped a dog to find its owner. Students were energized(激勵) by the homework assignment and wanted other people to be kind too. W   5  the support of local businesses, the students made stickers to put on cars that invited people to do something k  6  for others. They sold the stickers and decided to donate the money to a center for the blind –not surprising as Professor Wall is blind.

Since then, s   7  kindness activities have been organized in schools all over the world. Many schools organize a Random Acts of Kindness Week, a   8  November 13, to celebrate World Kindness Day. Some schools use each day of Random Acts of Kindness Week to perform

d  9   kind acts, such as making a new friend, helping someone, doing community service, or raising money for a charity. Students learn to c   10   other people and think about how small actions can make the world a better place.

1

h      

2

e      

3

s      

4

r      

5

W      

6

k      

7

s      

8

a      

9

d      

10

c      

查看答案和解析>>

科目：初中英語 來源： 題型：


They won`t allow us ________ at this beach.

   A.swimming      B.to swim     C.swam        D.swim

查看答案和解析>>

科目：初中英語 來源： 題型：


-----The flower is beautiful.  ---____________

   A.So is it    B.So it is     C.It is so      D.So it is

查看答案和解析>>

科目：初中英語 來源： 題型：


We are planning to have a party              her birthday.

  A. at                         B. in                             C. for                           D. with

查看答案和解析>>

同步練習(xí)冊答案