题型:语法填空(语篇) 题类:常考题 难易度:困难
甘肃省会宁县第一中学2018-2019学年高二下学期英语期中考试试卷
Two new satellites of BeiDou Navigation (导航) Satellite System (BDS)(send) into space on a Long March-3D carrier rocket from the Xichang Satellite Launch Center in Sichuan Province, China at 2:07 a.m. on November 19, 2018. The satellites entered a Medium Earth orbit (轨道) (safe) more than three hours later and will work with 17 other BDS-3 satellites already in space. They are also the 42nd and 43rd(member) of the BDS satellite family.
China launched these satellites with the aim of providing navigation servicescountries and regions which participate in the Belt and Road Proposal by the end of 2018. “This is a key and(value) step for BDS developing from a Chinese experimental system to a regional and then a global navigation system,” said Yang Changfeng, chief expertcontributed much to the BeiDou system. The positioning(accurate) of the BDS-3 system has been improved to 2.5 meters to 5 meters, said Yang.
(name) after the Chinese term for the Big Dipper, the BeiDou system has been serving China for 18 years where another six BDS-3 satellites will be put into the Medium Earth orbit from 2019 to 2020. The system is expected(provide) first-class services aroundglobe by the end of 2020.
试题篮