Question

【题目】 Competition is good for businesses. In the world of positioning systems, however, competition is also a must. 【1】 Now, China is building its own positioning system. It’s called Beidou.

China is only the third country in the world to own a positioning system. Only the United States and Russia have already developed their GPS or Glonass.

【2】With it, the country no longer has to rely on foreign systems. It also shows the world that China has made much technological progress.

Work on the Beidou project began in 1994. However, the first two Beidou satellites were not sent into space until 2000. 【3】These satellites have formed a global network. They began operations at the end of 2018. To further improve the system, China will send ten more Beidou satellites into space. It plans to complete the system before 2020.

【4】It will provide a positioning accuracy of within ten centimeters for the Chinese military. The United States’ GPS only has an accuracy of around 30 centimeters.

The Beidou system offers services to ordinary users, too. In big cities like Shanghai, thousands of buses have been using the Beidou system. 【5】

Moreover, most smartphones today can already receive Beidou signals. A phone salesperson in Beijing jokes, “Many people are used to saying, ‘I am using GPS.’ In fact, however, their phones have been using Beidou.”

根据短文内容，从方框中选出五个句子填入文中空缺处，使短文内容通顺完整。

A.Since then, China has launched dozens of Beidou satellites.

B.It is not wise for a country to rely on foreign systems for positioning.

C.People waiting for a bus can easily find out when it will come.

D.The American GPS, Russia’s Glonass have dozens of satellites to provide information across the globe.

E.The completed system will be more powerful than any existing foreign systems.

F.Beidou improves China’s national safety.

Answer 1

【答案】

【1】B

【2】E

【3】A

【4】F

【5】C

【解析】

本文介绍了中国的北斗定位系统。

【1】根据下一句“Now, China is building its own positioning system.”可知，现在，中国正在建立自己的定位系统，所以此处是“对一个国家来说，依赖外国系统进行定位是不明智的”。故选B。

【2】根据下一句中“With it, the country no longer has to rely on foreign systems.”可知，有了它，国家不再需要依赖外国系统，所以此处是“完整的系统将比任何现有的外国系统更强大。”。故选E。

【3】根据上文中“However, the first two Beidou satellites were not sent into space until 2000.”和下文中“These satellites have formed a global network.”可知，此处是“2000年两颗北斗卫星进入太空，从那时起，中国发射了几十颗北斗卫星，这些卫星已经形成了一个全球网络”。故选A。

【4】根据下文中可知，它将为中国军队提供10厘米以内的定位精度，美国的GPS只能精确到30厘米左右，所以此处是“北斗改善了中国的国家安全”。故选F。

【5】根据上一句“thousands of buses have been using the Beidou system”可知，成千上万的公交车在使用北斗系统，所以此处是“等车的人很容易就能知道车什么时候来”。故选C。