第一节阅读下面篇短文根据短文内容，从每小题所给的A、B、C、D四个选项中选项最佳选项。
Three-two-one, fire!
At the moment of 9:43 a.m., 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 network(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 Navigation 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 satellitle 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. It’s one of four global(全球的) navigation networks, including the United States’ GPS, Russia’s GLONASS and the European 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.
30. Where did China launch the last satellite of the third-generation network?
A. Xichang. B. Jiuquan. C. Wenchang. D. Taiyuan.
31. How many members are there in the family of Beidou?
A. 4. B. 55. C. 59. D. 114.
32. What does the underlined word “milestone” mean in Chinese?
A. 记录 B. 事业 C. 里程碑 D. 起点
33. GLONASS belongs to         .
A. China B. the United States C. Russia D. the European Union
34. According to the passage, we can know that        .
A. The last satellite of BDS was launched at 9:43 p.m., 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.
2020年6月23日9点43分，北斗卫星导航系统最后一颗卫星在西昌卫星发射中心成功送入太空。这次发射表明我国已经完成了我国最大的太空系统，是四个全球导航系统之一。北斗系统将为全世界提供更多服务，是人类发展的共同财富。
30.A【解析】细节理解题。根据短文第二段“At the moment of 9:43 a.m., 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 network (第三代导航系统) was sent into space.”可知，中国在四川西昌卫星发射中心将北斗导航系统最后一颗卫星送入太空。故选A。
31.C【解析】细节理解题。根据短文第二段“It belongs to China's Beidou Navigation 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.”可知，北斗卫星导航系统有55颗卫星和四颗试验卫星，共计59颗。故选C。
32.C【解析】词义猜测题。根据语境“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.”中国已经建成北斗系统第三代网络，意义重大。由此可猜测milestone应该是“里程碑”的意思，故选C。
33.C【解析】细节理解题。根据短文第三段“It's one of four global (全球的) navigation networks, including the United States' GPS, Russia's GLONASS and the European Union's Galileo.”可知，GLONASS属于俄罗斯。故选C。
34.D【解析】细节理解题。根据第三段“So far, China has completed the third-generation network of China's BDS.”可知，到目前为止，中国已经完成了北斗系统第三代网络，D选项符合文意，故选D。根据短文第二段“At the moment of 9:43 a.m., 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 network (第三代导航系统) was sent into space.”可知，发射时间白天9点43分，不是晚上，A不对；根据第三段“It is designed to work for at least 12 years.”可知B不对；根据最后一段“BDS has been widely used as public resources (资源) in our daily life. It has been shared by the whole world.”可知C不对。