（北京专用）英语九年级上学期期末历年真题分项汇编
四、阅读短文，根据短文内容回答问题。（共 10 分，34 题至 36 题每小题 2 分，37 题 4 分）
阅读短文，根据短文内容回答问题。
The Secret to Learning Languages
A lot of people think that they are not good at learning a new language. However, experts say that we can all learn from the behavior (行为) of good language learners to become better at languages.
Good language learners look for chances to hear and use the new language outside of the classroom, as a result, they learn the language more quickly. If they’re studying in a country where the language is spoken, this is easy to do. For example, they can talk to salesmen, join sports clubs, or even talk to people in coffee stores. However, if they are studying in a country where the language is not spoken, there are still ways to practice outside of class. They might read newspapers and magazines in that language, watch movies, listen to the news, or join chat rooms. All of these are great chances to practice and can also be fun.
What’s more, good language learners try different ways to make their message understood. For example, if they do not know the word for “laundromat”, they might say “the place where you can wash clothes”. If that does not work, they might even try drawing a laundromat with washers and dryers, or acting. The point is that good language learners are creative and do not easily give up. Because of these qualities (品质), they can learn more and better.
Finally, good language learners are prepared to take risks. They think that making mistakes is natural and is necessary to learn. As a result, instead of being uneasy by a mistake or getting upset when they do not understand, they see it as earning a learning chance. For example, if they do not understand what someone said the first time, they are not afraid to ask them to repeat it again and again until they do understand. Or, if someone corrects their vocabulary or grammar, they try to remember instead of becoming shy about speaking.
Learning a language well takes time. However, looking for chances to practice the language, trying different ways to communicate, taking risks, and being prepared to make mistakes will help you become a skilled and confident language learner in the long run.
34. How can you become better at languages according to the experts
________________________________________________________
35. Why do good language learners learn a language more quickly
________________________________________________________
36. What do good language learners do if they don’t understand what someone said the first time
________________________________________________________
37. Which behavior of good language learners do you agree most Why
________________________________________________________
【答案】34. We can all learn from the behavior of good language learners.
35. Because they look for chances to hear and use the new language outside of the classroom.
36. They are not afraid to ask them to repeat it again and again until they do understand.
37. I agree that making mistakes is natural and is necessary to learn. Because we can see it as earning a learning chance. We can learn from our mistakes.
【解析】
【导语】本文是一篇说明文。文章介绍了学习语言方法。
【34题详解】
根据“However, experts say that we can all learn from the behavior (行为) of good language learners to become better at languages.”可知，专家表示，我们都可以从优秀的语言学习者的行为中学习，从而变得更擅长语言。故填We can all learn from the behavior of good language learners.
【35题详解】
根据“Good language learners look for chances to hear and use the new language outside of the classroom, as a result, they learn the language more quickly.”可知，优秀的语言学习者会在课堂外寻找听到和使用新语言的机会，因此，他们学习语言的速度更快。故填Because they look for chances to hear and use the new language outside of the classroom.
【36题详解】
根据“For example, if they do not understand what someone said the first time, they are not afraid to ask them to repeat it again and again until they do understand.”可知，优秀的语言学习者如果不理解别人第一次说的话，他们不怕让他们一遍又一遍地重复，直到他们理解为止。故填They are not afraid to ask them to repeat it again and again until they do understand.
【37题详解】
开放性问题，言之有理即可。参考答案I agree that making mistakes is natural and is necessary to learn. Because we can see it as earning a learning chance. We can learn from our mistakes.
第二部分
本部分共5题，共20分。根据题目要求，完成相应任务。
四、阅读表达（34 至 36 题每题 2 分，37 题 4 分，共 10 分）
阅读短文，根据短文内容回答问题。
How to Spend Your Weekend Alone Without Losing It
There can be many, many stories behind weekends spent alone.
In the 4 years that I’ve been living on my own now, I’ve achieved the feat(壮举) of spending 208 weekends alone.
Based on(基于) this mind-blowing success here’s a practical guide so that you, too, can spend your weekends, alone.
1.Go to a Free Gig(演出)
Coffee shops, libraries and local places often host free gigs, so see if there is anything going on in your area this weekend. Concerts can actually be much more rewarding(有意义的) when you go alone.
2.Go on a Long Walk
Going for a long walk and experiencing nature is often more enjoyable if you are alone, as it is peaceful, quiet, and relaxing.
You can stop to appreciate every beautiful flower you pass, and hear all of the quiet, busy sounds of nature.
3.Order Your Favourite Take Out Food
Get the menu and order your favourite take-away. As you don’t have to share it with anyone else, you can order as much food as you want.
4.Take a Shopping Trip Alone
Bring down any shopping stress by taking the trip alone. Other people can slow you down or make you hurry up, and you can end up missing out on the best clothes.
Take a relaxing trip alone and take your time trying everything on: you are likely to have a great day and find something you love.
5.Watch a TV Show You Love
The best part about watching television alone is that you can watch whatever you want. Put on your comfortable clothes, get some food and put your feet up for hours of watching.
34. What is the practical guide based on
________________________________________
35. How many ways of spending the weekend are there in the guide
________________________________________
36. Why is going for a long walk and experiencing nature more enjoyable if you are alone
________________________________________
37. When you are alone, how do you spend your weekend And why
________________________________________
【答案】34. It is based on the writer’s success of spending 208 weekends alone. 35. Five/5.
36. Because it is peaceful, quiet, and relaxing.
37. I will stay at home and do some things I like, such as reading books and raising flowers. Because after a busy week, it is the good time to relax.（答案合理即可）
【解析】
【导语】本文是作者根据自身的成功经历，就“如何独自度过周末”给出了一个实用指南。
【34题详解】
根据“In the 4 years that I’ve been living on my own now, I’ve achieved the feat(壮举) of spending 208 weekends alone. Based on(基于) this mind-blowing success, here’s a practical guide so that you, too, can spend your weekends, alone.”可知，是基于作者独自度过周末的成功经历，故填It is based on the writer’s success of spending 208 weekends alone.
【35题详解】
根据“1.Go to a Free Gig(演出)...2.Go on a Long Walk...3.Order Your Favourite Take Out Food...4.Take a Shopping Trip Alone....5.Watch a TV Show You Love”可知，一共给出了5种方法，故填Five/5.
【36题详解】
根据“Going for a long walk and experiencing nature is often more enjoyable if you are alone, as it is peaceful, quiet, and relaxing.”可知，因为它是平和、安静、放松的，故填Because it is peaceful, quiet, and relaxing.
【37题详解】
开放性题，答案合理即可。参考答案：I will stay at home and do some things I like, such as reading books and raising flowers. Because after a busy week, it is the good time to relax.
第二部分
本部分共 6 题，共 20 分。根据题目要求，完成相应任务。
四、阅读表达（每题 2 分，共 10 分）
阅读短文，根据短文内容回答问题。
Have you ever heard of netball It is a team sport which is similar to both basketball and handball.
Netball was first played in England in 1895 at Madame Ostenburg’s College. In the first half of the 20th century, Netball’s popularity continued to grow, with the game being played in many countries, it is particularly popular in Australia and New Zealand. In 1995 Netball became a “recognized” sport of the International Olympic Committee (IOC) and one of the International Netball Federation’s goals is to encourage the IOC to include netball in the Olympic Games Programme in the future.
There are seven players on each team and they each wear a bib (号码布) which shows the name of the position they play. Players must throw the ball to one another and the aim of the game is to pass the ball to the “Goal Shooter” or “Goal Attack” who can shoot the ball into the net to score a goal. However, the key rules of netball are that you cannot bounce (拍) the ball and you cannot move your feet when you have the ball. This is called the footwork rule and it can be quite difficult to grasp (掌握) for young children playing the game! A full match lasts for one hour and in a single match often about 100 goals are scored which shows what a fast-paced and exciting game netball is!
Netball is typically played by women and girls. However, at many universities, there are mixed netball leagues (联赛) in which teams must have both male and female players.
In the UK, there are many different ways to try to attract women to play netball. One such plan is called “Back to Netball” which encourages women who have not played netball since they were at school to rediscover their love for the sport and get back on the court! Walking Netball is another variation (变化形式) of the sport aimed at older women and those who want to exercise in a gentler way. So, why not watch a video of netball online and then have a go for yourself
34 What is netball similar to
_______________________________________
35. When was netball first played
_______________________________________
36. How long does a full netball match last
_______________________________________
37. What is Walking Netball
_______________________________________
38. What is Paragraph 3 mainly talking about
_______________________________________
【答案】34. It is similar to both basketball and handball.
ball was first played in 1895./In 1895.
36. A full netball match lasts for one hour./One hour.
37. Walking Netball is another variation of the sport aimed at older women and those who want to exercise in a gentler way.
38. It is mainly talking about the rules of netball.
【解析】
【分析】本文主要介绍了一项体育运动——无板篮球的来源，规则和发展。
【34题详解】
根据第一段“It is a team sport which is similar to both basketball and handball.”可知它类似于篮球和手球故填It is similar to both basketball and handball.
【35题详解】
根据第二段“Netball was first played in England in 1895 at Madame Ostenburg’s College”可知无板篮球1895年首次在英国进行，故填Netball was first played in 1895./In 1895.
【36题详解】
根据第三段“A full match lasts for one hour”可知一场完整的比赛持续一个小时，故填A full netball match lasts for one hour./One hour.
【37题详解】
根据最后一段“Walking Netball is another variation (变化形式) of the sport aimed at older women and those who want to exercise in a gentler way.”可知它是这项运动的另一种变体，主要针对老年女性和那些想以更温和的方式锻炼的人。故填Walking Netball is another variation of the sport aimed at older women and those who want to exercise in a gentler way.
【38题详解】
根据第三段“There are seven players on each team and they each wear a bib (号码布) which shows the name of the position they play...This is called the footwork rule and it can be quite difficult to grasp (掌握) for young children playing the game”可知第三段主要讲述了无板篮球的规则。故填It is mainly talking about the rules of netball.
阅读表达（共10分）
Have you ever started a book, read a few pages, and found that it wasn't interesting at all If you have, you may be faced with a dilemma (困境): should you keep going with the book, even if you aren’t enjoying it, or put it down and find something else What do you have in mind
Some people say you should go on reading the book you’ve started. Some of the best books ever written are full of difficult words and paragraphs. with lots of characters and different storylines. It’s better to keep reading, because it is an important skill to keep going and get to the end. Besides, if you stop reading halfway through, how will you know how everything turns out for the characters What’s more, the book might suddenly become really interesting, and there might even be a surprise change. Giving up is easy, but trying to finish a difficult book is a good skill to have.
But not everybody has the same idea, Cressida Cowell, the new Children’s Laureate (儿童文学桂冠奖得主), says it’s OK to stop reading a book you don’t like. She says young readers should read books they enjoy, not those that aren’t of much interest. There are lots of wonderful books waiting to be read in libraries and bookshops, so spending hours and days trying hard to read an uninteresting story is meaningless. Nobody would choose to sit through a boring TV show. Giving up and trying a different book is the same as picking something else to watch on TV. Besides, it's important to enjoy reading and not think of it as a chore. If you have to finish a book that you are not enjoying, it might put you off reading other books in the future.
If you ask me, I think you shouldn’t give up after page one. I advise you to read around 20 pages and then you can stop reading if you really don't like the characters or can’t easily jump into their world. Sometimes you’re just not in a place for a book, and it’s OK to set it aside and revisit it later. A book you’re not loving today could end up being your favorite in a few years.
34. In Paragraph 2, why do some people say it’s better to keep reading
_____________________________________
35. What is Cressida Cowell’s idea about stopping reading a book you don’t like
_____________________________________
36. How many pages does the writer advise to read before you want to give up
_____________________________________
37. If you don’t like a book you’ve started, what will you do, to stop reading it halfway or to go on reading it Why (In about 30 words)
_____________________________________
【答案】34. Because it is an important skill.
35. She says it’s OK.
36. Twenty.
37. I will go on reading it. Because it is very important, and there are a lot of useful things in the book.
【解析】
【导语】本文主要介绍了遇到自己不喜欢的书应该怎么做。
【34题详解】
根据“It’s better to keep reading, because it is an important skill to keep going and get to the end.”可知，有些人说坚持阅读更好，是因为坚持阅读是一项重要的技能。故填Because it is an important skill.
【35题详解】
根据“Cressida Cowell, the new Children’s Laureate, says it’s OK to stop reading a book you don’t like.”可知，儿童文学桂冠奖得主Cressida Cowell说停止读你不喜欢的书是可以的。故填She says it’s OK.
【36题详解】
根据“If you ask me, I think you shouldn’t give up after page one. I advise you to read around 20 pages.”可知，作者建议在你想要放弃之前读20页。故填Twenty。
【37题详解】
开放性答案，合理即可。故填I will go on reading it. Because it is very important, and there are a lot of useful things in the book.
四、(共 10 分,每小题 2 分)
阅读短文,根据短文内容回答问题。
In ancient times, people depended on stars to guide them on a clear night. Today, we have navigational systems (导航系统) to help us find our way. The recent one is the Beidou Navigation Satellite System (BDS).
The Chinese engineers built the BDS independently. With the launch of the last satellite from the Xichang Satellite Launch Center on June 23, 2021, the global (全球的) network of 59 satellites has been completed. On July 31 of the same year, Beidou started providing services to the world. It’s difficult to imagine.
BDS
When you unlock one of Hellobike’s bicycles you are using the BDS. Users can also find shared bikes more easily thanks to Beidou’s positioning service.
However, the BDS doesn’t just work one way. As the country’s largest space-based system and one of four global navigation networks, Beidou has a two-way communication system, including its ability to receive messages sent by people from areas with poor communication signals. Obviously, it isn’t designed for users to chat online. Instead, it plays a role when disasters happen and communications are blocked.
After the Wenchuan earthquake in 2008, all ground-based communication facilities (设施) were interrupted. Though the first generation of Beidou could only send 120 characters in a single message at that time, communication between affected areas and rescue centers was successful. Now, Beidou can send 1,200 Chinese characters in a single message.
As Sun Jiadong, former chief designer of the BDS said, “The application( 应用) of Beidou is only limited by imagination.”
34. What’s the recent navigational system
__________________________________
35. When did the BDS start providing services to the world
__________________________________
36. What communication system does BDS have
__________________________________
37. How many Chinese characters can Beidou send in a single message now
__________________________________
38. What do you think of the Beidou Navigation Satellite System Why
__________________________________
【答案】34. The recent one is the Beidou Navigation Satellite System (BDS).
35. On July 31, 2021.
36. Beidou has a two-way communication system.
37. Now, Beidou can send 1,200 Chinese characters in a single message.
38. Beidou Navigation Satellite System is quite useful and helpful. Because it is convenient for people to find their way and find shared bikes more easily. The application of Beidou is only limited by imagination.
【解析】
【分析】这是一篇说明文，文章讲述北斗卫星导航系统的应用和各种用途。
【34题详解】
根据第一段“The recent one is the Beidou Navigation Satellite System (BDS)”可知，现在的导航是北斗卫星导航系统。故填The recent one is the Beidou Navigation Satellite System (BDS).
【35题详解】
根据第二段“on June 23, 2021, the global network of 59 satellites has been completed. On July 31 of the same year, Beidou started providing services to the world”可知，北斗卫星导航系统在2021年7月31日开始给世界提供服务。故填On July 31, 2021.
【36题详解】
根据第四段“Beidou has a two-way communication system”可知，北斗有双向通信系统。故填Beidou has a two-way communication system.
【37题详解】
根据倒数第二段“Now, Beidou can send 1,200 Chinese characters in a single message”可知，现在北斗单条信息可以发送1200个汉字。故填Now, Beidou can send 1,200 Chinese characters in a single message.
【38题详解】
根据第一段“Today, we have navigational systems to help us find our way”，第三段“When you unlock one of Hellobike’s bicycles, you are using the BDS. Users can also find shared bikes more easily thanks to Beidou’s positioning service”及“The application of Beidou is only limited by imagination”可知北斗系统非常有用，它使生活便利，故填Beidou Navigation Satellite System is quite useful and helpful. Because it is convenient for people to find their way and find shared bikes more easily. The application of Beidou is only limited by imagination.（北京专用）英语九年级上学期期末历年真题分项汇编
四、阅读短文，根据短文内容回答问题。（共 10 分，34 题至 36 题每小题 2 分，37 题 4 分）
阅读短文，根据短文内容回答问题。
The Secret to Learning Languages
A lot of people think that they are not good at learning a new language. However, experts say that we can all learn from the behavior (行为) of good language learners to become better at languages.
Good language learners look for chances to hear and use the new language outside of the classroom, as a result, they learn the language more quickly. If they’re studying in a country where the language is spoken, this is easy to do. For example, they can talk to salesmen, join sports clubs, or even talk to people in coffee stores. However, if they are studying in a country where the language is not spoken, there are still ways to practice outside of class. They might read newspapers and magazines in that language, watch movies, listen to the news, or join chat rooms. All of these are great chances to practice and can also be fun.
What’s more, good language learners try different ways to make their message understood. For example, if they do not know the word for “laundromat”, they might say “the place where you can wash clothes”. If that does not work, they might even try drawing a laundromat with washers and dryers, or acting. The point is that good language learners are creative and do not easily give up. Because of these qualities (品质), they can learn more and better.
Finally, good language learners are prepared to take risks. They think that making mistakes is natural and is necessary to learn. As a result, instead of being uneasy by a mistake or getting upset when they do not understand, they see it as earning a learning chance. For example, if they do not understand what someone said the first time, they are not afraid to ask them to repeat it again and again until they do understand. Or, if someone corrects their vocabulary or grammar, they try to remember instead of becoming shy about speaking.
Learning a language well takes time. However, looking for chances to practice the language, trying different ways to communicate, taking risks, and being prepared to make mistakes will help you become a skilled and confident language learner in the long run.
34. How can you become better at languages according to the experts
________________________________________________________
35. Why do good language learners learn a language more quickly
________________________________________________________
36. What do good language learners do if they don’t understand what someone said the first time
________________________________________________________
37. Which behavior of good language learners do you agree most Why
________________________________________________________
第二部分
本部分共5题，共20分。根据题目要求，完成相应任务。
四、阅读表达（34 至 36 题每题 2 分，37 题 4 分，共 10 分）
阅读短文，根据短文内容回答问题。
How to Spend Your Weekend Alone Without Losing It
There can be many, many stories behind weekends spent alone.
In the 4 years that I’ve been living on my own now, I’ve achieved the feat(壮举) of spending 208 weekends alone.
Based on(基于) this mind-blowing success here’s a practical guide so that you, too, can spend your weekends, alone.
1.Go to a Free Gig(演出)
Coffee shops, libraries and local places often host free gigs, so see if there is anything going on in your area this weekend. Concerts can actually be much more rewarding(有意义的) when you go alone.
2.Go on a Long Walk
Going for a long walk and experiencing nature is often more enjoyable if you are alone, as it is peaceful, quiet, and relaxing.
You can stop to appreciate every beautiful flower you pass, and hear all of the quiet, busy sounds of nature.
3.Order Your Favourite Take Out Food
Get the menu and order your favourite take-away. As you don’t have to share it with anyone else, you can order as much food as you want.
4.Take a Shopping Trip Alone
Bring down any shopping stress by taking the trip alone. Other people can slow you down or make you hurry up, and you can end up missing out on the best clothes.
Take a relaxing trip alone and take your time trying everything on: you are likely to have a great day and find something you love.
5.Watch a TV Show You Love
The best part about watching television alone is that you can watch whatever you want. Put on your comfortable clothes, get some food and put your feet up for hours of watching.
34. What is the practical guide based on
________________________________________
35. How many ways of spending the weekend are there in the guide
________________________________________
36. Why is going for a long walk and experiencing nature more enjoyable if you are alone
________________________________________
37. When you are alone, how do you spend your weekend And why
________________________________________
第二部分
本部分共 6 题，共 20 分。根据题目要求，完成相应任务。
四、阅读表达（每题 2 分，共 10 分）
阅读短文，根据短文内容回答问题。
Have you ever heard of netball It is a team sport which is similar to both basketball and handball.
Netball was first played in England in 1895 at Madame Ostenburg’s College. In the first half of the 20th century, Netball’s popularity continued to grow, with the game being played in many countries, it is particularly popular in Australia and New Zealand. In 1995 Netball became a “recognized” sport of the International Olympic Committee (IOC) and one of the International Netball Federation’s goals is to encourage the IOC to include netball in the Olympic Games Programme in the future.
There are seven players on each team and they each wear a bib (号码布) which shows the name of the position they play. Players must throw the ball to one another and the aim of the game is to pass the ball to the “Goal Shooter” or “Goal Attack” who can shoot the ball into the net to score a goal. However, the key rules of netball are that you cannot bounce (拍) the ball and you cannot move your feet when you have the ball. This is called the footwork rule and it can be quite difficult to grasp (掌握) for young children playing the game! A full match lasts for one hour and in a single match often about 100 goals are scored which shows what a fast-paced and exciting game netball is!
Netball is typically played by women and girls. However, at many universities, there are mixed netball leagues (联赛) in which teams must have both male and female players.
In the UK, there are many different ways to try to attract women to play netball. One such plan is called “Back to Netball” which encourages women who have not played netball since they were at school to rediscover their love for the sport and get back on the court! Walking Netball is another variation (变化形式) of the sport aimed at older women and those who want to exercise in a gentler way. So, why not watch a video of netball online and then have a go for yourself
34 What is netball similar to
_______________________________________
35. When was netball first played
_______________________________________
36. How long does a full netball match last
_______________________________________
37. What is Walking Netball
_______________________________________
38. What is Paragraph 3 mainly talking about
_______________________________________
阅读表达（共10分）
Have you ever started a book, read a few pages, and found that it wasn't interesting at all If you have, you may be faced with a dilemma (困境): should you keep going with the book, even if you aren’t enjoying it, or put it down and find something else What do you have in mind
Some people say you should go on reading the book you’ve started. Some of the best books ever written are full of difficult words and paragraphs. with lots of characters and different storylines. It’s better to keep reading, because it is an important skill to keep going and get to the end. Besides, if you stop reading halfway through, how will you know how everything turns out for the characters What’s more, the book might suddenly become really interesting, and there might even be a surprise change. Giving up is easy, but trying to finish a difficult book is a good skill to have.
But not everybody has the same idea, Cressida Cowell, the new Children’s Laureate (儿童文学桂冠奖得主), says it’s OK to stop reading a book you don’t like. She says young readers should read books they enjoy, not those that aren’t of much interest. There are lots of wonderful books waiting to be read in libraries and bookshops, so spending hours and days trying hard to read an uninteresting story is meaningless. Nobody would choose to sit through a boring TV show. Giving up and trying a different book is the same as picking something else to watch on TV. Besides, it's important to enjoy reading and not think of it as a chore. If you have to finish a book that you are not enjoying, it might put you off reading other books in the future.
If you ask me, I think you shouldn’t give up after page one. I advise you to read around 20 pages and then you can stop reading if you really don't like the characters or can’t easily jump into their world. Sometimes you’re just not in a place for a book, and it’s OK to set it aside and revisit it later. A book you’re not loving today could end up being your favorite in a few years.
34. In Paragraph 2, why do some people say it’s better to keep reading
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35. What is Cressida Cowell’s idea about stopping reading a book you don’t like
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36. How many pages does the writer advise to read before you want to give up
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37. If you don’t like a book you’ve started, what will you do, to stop reading it halfway or to go on reading it Why (In about 30 words)
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四、(共 10 分,每小题 2 分)
阅读短文,根据短文内容回答问题。
In ancient times, people depended on stars to guide them on a clear night. Today, we have navigational systems (导航系统) to help us find our way. The recent one is the Beidou Navigation Satellite System (BDS).
The Chinese engineers built the BDS independently. With the launch of the last satellite from the Xichang Satellite Launch Center on June 23, 2021, the global (全球的) network of 59 satellites has been completed. On July 31 of the same year, Beidou started providing services to the world. It’s difficult to imagine.
BDS
When you unlock one of Hellobike’s bicycles you are using the BDS. Users can also find shared bikes more easily thanks to Beidou’s positioning service.
However, the BDS doesn’t just work one way. As the country’s largest space-based system and one of four global navigation networks, Beidou has a two-way communication system, including its ability to receive messages sent by people from areas with poor communication signals. Obviously, it isn’t designed for users to chat online. Instead, it plays a role when disasters happen and communications are blocked.
After the Wenchuan earthquake in 2008, all ground-based communication facilities (设施) were interrupted. Though the first generation of Beidou could only send 120 characters in a single message at that time, communication between affected areas and rescue centers was successful. Now, Beidou can send 1,200 Chinese characters in a single message.
As Sun Jiadong, former chief designer of the BDS said, “The application( 应用) of Beidou is only limited by imagination.”
34. What’s the recent navigational system
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35. When did the BDS start providing services to the world
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36. What communication system does BDS have
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37. How many Chinese characters can Beidou send in a single message now
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38. What do you think of the Beidou Navigation Satellite System Why
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