The successful launch of Tiangong?1 symbolizes a further step for China to join in the of space stations previously mastered by Russia and the US.A．invention B．productionC．operation D．preparation& 题目和参考答案——青夏教育精英家教网—

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The successful launch of Tiangong?1 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

【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。

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