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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】考查名詞辨析。句意：“天宮1號”的成功發(fā)射使中國向空間站的運作更近了一步，空間站技術先前只有俄羅斯和美國掌握。operation“運行，操作”，符合語意。

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