Three﹣two ﹣one， fire!

    At the moment of 9：43 am， on Tuesday， June 23rd， 2020， at the Xichang Satellite Launch Center （卫星发射中心） in Sichuan Province， the last satellite of the third﹣generation nehoork （第三代导航系统）was sent into space． It is the 55th member in the family of BeiDou． It belongs to China's Beidou Narigation Satellite System （BDS北斗卫星导航系统）． So far． 59 satellites， including the first four test ones， have been launched from Xichang With the development of China， we have already owned three other famous satellite launch centers﹣﹣Jiuquan， Taiyuan and Wenchang．

    After a period of tests in space， this new satellite has started to work with other Beidou satellites together． It is designed to work for at least 12 years． So far，China has completed the third﹣generation network of China's BDS． It was a new milestone in the nation's space research work． The launch showed our country has completed our largest space ﹣based system． I's one of four global（全球的） navigation networks，including the United States' GPS， Russia's GLONASS and theEuropean Union's Galileo．

    BDS has been widely used as public resources（ 资源） in our daily life． It has been shared by the whole world． It will provide more services around the world． BDS is the common wealth of the development of human beings．

（1）Where did China launch the last satellite of the third﹣generation network？　　

A． Xichang．

B． Jiuquan．

C． Wenchang．

D． Taiyuan．

（2）How many members are there in the family of Beidou？　　

A．4．

B．55．

C．59．

D．114．

（3）What does the underlined word "milestone" mean in Chinese？　　

A．记录

B．事业

C．里程碑

D．起点

（4）GLONASS belongs to　　．

A． China

B． the United States

C． Russia

D． the European Union

（5）According to the passage， we can know that　　．

A． The last satellite of BDS was launched at 9：43 pm， June 23rd， 2020

B． The new satellite is designed to work for at most 12 years

C． BDS is shared only by China as public resources

D． So far， China has completed the third﹣generation network of China's BDS