Question

【題目】 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.”

根據(jù)短文內(nèi)容，從方框中選出五個句子填入文中空缺處，使短文內(nèi)容通順完整。

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】

本文介紹了中國的北斗定位系統(tǒng)。

【1】根據(jù)下一句“Now, China is building its own positioning system.”可知，現(xiàn)在，中國正在建立自己的定位系統(tǒng)，所以此處是“對一個國家來說，依賴外國系統(tǒng)進行定位是不明智的”。故選B。

【2】根據(jù)下一句中“With it, the country no longer has to rely on foreign systems.”可知，有了它，國家不再需要依賴外國系統(tǒng)，所以此處是“完整的系統(tǒng)將比任何現(xiàn)有的外國系統(tǒng)更強大。”。故選E。

【3】根據(jù)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，此處是“2000年兩顆北斗衛(wèi)星進入太空，從那時起，中國發(fā)射了幾十顆北斗衛(wèi)星，這些衛(wèi)星已經(jīng)形成了一個全球網(wǎng)絡(luò)”。故選A。

【4】根據(jù)下文中可知，它將為中國軍隊提供10厘米以內(nèi)的定位精度，美國的GPS只能精確到30厘米左右，所以此處是“北斗改善了中國的國家安全”。故選F。

【5】根據(jù)上一句“thousands of buses have been using the Beidou system”可知，成千上萬的公交車在使用北斗系統(tǒng)，所以此處是“等車的人很容易就能知道車什么時候來”。故選C。