The successful launch of Tiangong­1 symbolizes a further step for China to join in the

发布时间：2020-08-17 08:43:35

The successful launch of Tiangong­1 symbolizes a further step for China to join in the    of space stations previously mastered by Russia and the US.
A. invention　
B. production
C. operation　
D. preparation

网友回答

A. invention　
B. production
(答案→)C. operation　
D. preparation
解析：考查名词辨析。句意：“天宫1号”的成功发射使中国向空间站的运作更近了一步，空间站技术先前只有俄罗斯和美国掌握。operation“运行，操作”，符合语意。
以上问题属网友观点，不代表本站立场，仅供参考！